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TOMOYO Linux Cross Reference
Linux/arch/powerpc/kernel/prom_init.c

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  1 /*
  2  * Procedures for interfacing to Open Firmware.
  3  *
  4  * Paul Mackerras       August 1996.
  5  * Copyright (C) 1996-2005 Paul Mackerras.
  6  * 
  7  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
  8  *    {engebret|bergner}@us.ibm.com 
  9  *
 10  *      This program is free software; you can redistribute it and/or
 11  *      modify it under the terms of the GNU General Public License
 12  *      as published by the Free Software Foundation; either version
 13  *      2 of the License, or (at your option) any later version.
 14  */
 15 
 16 #undef DEBUG_PROM
 17 
 18 #include <stdarg.h>
 19 #include <linux/kernel.h>
 20 #include <linux/string.h>
 21 #include <linux/init.h>
 22 #include <linux/threads.h>
 23 #include <linux/spinlock.h>
 24 #include <linux/types.h>
 25 #include <linux/pci.h>
 26 #include <linux/proc_fs.h>
 27 #include <linux/stringify.h>
 28 #include <linux/delay.h>
 29 #include <linux/initrd.h>
 30 #include <linux/bitops.h>
 31 #include <asm/prom.h>
 32 #include <asm/rtas.h>
 33 #include <asm/page.h>
 34 #include <asm/processor.h>
 35 #include <asm/irq.h>
 36 #include <asm/io.h>
 37 #include <asm/smp.h>
 38 #include <asm/mmu.h>
 39 #include <asm/pgtable.h>
 40 #include <asm/pci.h>
 41 #include <asm/iommu.h>
 42 #include <asm/btext.h>
 43 #include <asm/sections.h>
 44 #include <asm/machdep.h>
 45 #include <asm/opal.h>
 46 
 47 #include <linux/linux_logo.h>
 48 
 49 /*
 50  * Eventually bump that one up
 51  */
 52 #define DEVTREE_CHUNK_SIZE      0x100000
 53 
 54 /*
 55  * This is the size of the local memory reserve map that gets copied
 56  * into the boot params passed to the kernel. That size is totally
 57  * flexible as the kernel just reads the list until it encounters an
 58  * entry with size 0, so it can be changed without breaking binary
 59  * compatibility
 60  */
 61 #define MEM_RESERVE_MAP_SIZE    8
 62 
 63 /*
 64  * prom_init() is called very early on, before the kernel text
 65  * and data have been mapped to KERNELBASE.  At this point the code
 66  * is running at whatever address it has been loaded at.
 67  * On ppc32 we compile with -mrelocatable, which means that references
 68  * to extern and static variables get relocated automatically.
 69  * ppc64 objects are always relocatable, we just need to relocate the
 70  * TOC.
 71  *
 72  * Because OF may have mapped I/O devices into the area starting at
 73  * KERNELBASE, particularly on CHRP machines, we can't safely call
 74  * OF once the kernel has been mapped to KERNELBASE.  Therefore all
 75  * OF calls must be done within prom_init().
 76  *
 77  * ADDR is used in calls to call_prom.  The 4th and following
 78  * arguments to call_prom should be 32-bit values.
 79  * On ppc64, 64 bit values are truncated to 32 bits (and
 80  * fortunately don't get interpreted as two arguments).
 81  */
 82 #define ADDR(x)         (u32)(unsigned long)(x)
 83 
 84 #ifdef CONFIG_PPC64
 85 #define OF_WORKAROUNDS  0
 86 #else
 87 #define OF_WORKAROUNDS  of_workarounds
 88 int of_workarounds;
 89 #endif
 90 
 91 #define OF_WA_CLAIM     1       /* do phys/virt claim separately, then map */
 92 #define OF_WA_LONGTRAIL 2       /* work around longtrail bugs */
 93 
 94 #define PROM_BUG() do {                                         \
 95         prom_printf("kernel BUG at %s line 0x%x!\n",            \
 96                     __FILE__, __LINE__);                        \
 97         __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR);       \
 98 } while (0)
 99 
100 #ifdef DEBUG_PROM
101 #define prom_debug(x...)        prom_printf(x)
102 #else
103 #define prom_debug(x...)
104 #endif
105 
106 
107 typedef u32 prom_arg_t;
108 
109 struct prom_args {
110         __be32 service;
111         __be32 nargs;
112         __be32 nret;
113         __be32 args[10];
114 };
115 
116 struct prom_t {
117         ihandle root;
118         phandle chosen;
119         int cpu;
120         ihandle stdout;
121         ihandle mmumap;
122         ihandle memory;
123 };
124 
125 struct mem_map_entry {
126         __be64  base;
127         __be64  size;
128 };
129 
130 typedef __be32 cell_t;
131 
132 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
133                     unsigned long r6, unsigned long r7, unsigned long r8,
134                     unsigned long r9);
135 
136 #ifdef CONFIG_PPC64
137 extern int enter_prom(struct prom_args *args, unsigned long entry);
138 #else
139 static inline int enter_prom(struct prom_args *args, unsigned long entry)
140 {
141         return ((int (*)(struct prom_args *))entry)(args);
142 }
143 #endif
144 
145 extern void copy_and_flush(unsigned long dest, unsigned long src,
146                            unsigned long size, unsigned long offset);
147 
148 /* prom structure */
149 static struct prom_t __initdata prom;
150 
151 static unsigned long prom_entry __initdata;
152 
153 #define PROM_SCRATCH_SIZE 256
154 
155 static char __initdata of_stdout_device[256];
156 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
157 
158 static unsigned long __initdata dt_header_start;
159 static unsigned long __initdata dt_struct_start, dt_struct_end;
160 static unsigned long __initdata dt_string_start, dt_string_end;
161 
162 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
163 
164 #ifdef CONFIG_PPC64
165 static int __initdata prom_iommu_force_on;
166 static int __initdata prom_iommu_off;
167 static unsigned long __initdata prom_tce_alloc_start;
168 static unsigned long __initdata prom_tce_alloc_end;
169 #endif
170 
171 /* Platforms codes are now obsolete in the kernel. Now only used within this
172  * file and ultimately gone too. Feel free to change them if you need, they
173  * are not shared with anything outside of this file anymore
174  */
175 #define PLATFORM_PSERIES        0x0100
176 #define PLATFORM_PSERIES_LPAR   0x0101
177 #define PLATFORM_LPAR           0x0001
178 #define PLATFORM_POWERMAC       0x0400
179 #define PLATFORM_GENERIC        0x0500
180 #define PLATFORM_OPAL           0x0600
181 
182 static int __initdata of_platform;
183 
184 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
185 
186 static unsigned long __initdata prom_memory_limit;
187 
188 static unsigned long __initdata alloc_top;
189 static unsigned long __initdata alloc_top_high;
190 static unsigned long __initdata alloc_bottom;
191 static unsigned long __initdata rmo_top;
192 static unsigned long __initdata ram_top;
193 
194 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
195 static int __initdata mem_reserve_cnt;
196 
197 static cell_t __initdata regbuf[1024];
198 
199 static bool rtas_has_query_cpu_stopped;
200 
201 
202 /*
203  * Error results ... some OF calls will return "-1" on error, some
204  * will return 0, some will return either. To simplify, here are
205  * macros to use with any ihandle or phandle return value to check if
206  * it is valid
207  */
208 
209 #define PROM_ERROR              (-1u)
210 #define PHANDLE_VALID(p)        ((p) != 0 && (p) != PROM_ERROR)
211 #define IHANDLE_VALID(i)        ((i) != 0 && (i) != PROM_ERROR)
212 
213 
214 /* This is the one and *ONLY* place where we actually call open
215  * firmware.
216  */
217 
218 static int __init call_prom(const char *service, int nargs, int nret, ...)
219 {
220         int i;
221         struct prom_args args;
222         va_list list;
223 
224         args.service = cpu_to_be32(ADDR(service));
225         args.nargs = cpu_to_be32(nargs);
226         args.nret = cpu_to_be32(nret);
227 
228         va_start(list, nret);
229         for (i = 0; i < nargs; i++)
230                 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
231         va_end(list);
232 
233         for (i = 0; i < nret; i++)
234                 args.args[nargs+i] = 0;
235 
236         if (enter_prom(&args, prom_entry) < 0)
237                 return PROM_ERROR;
238 
239         return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
240 }
241 
242 static int __init call_prom_ret(const char *service, int nargs, int nret,
243                                 prom_arg_t *rets, ...)
244 {
245         int i;
246         struct prom_args args;
247         va_list list;
248 
249         args.service = cpu_to_be32(ADDR(service));
250         args.nargs = cpu_to_be32(nargs);
251         args.nret = cpu_to_be32(nret);
252 
253         va_start(list, rets);
254         for (i = 0; i < nargs; i++)
255                 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
256         va_end(list);
257 
258         for (i = 0; i < nret; i++)
259                 args.args[nargs+i] = 0;
260 
261         if (enter_prom(&args, prom_entry) < 0)
262                 return PROM_ERROR;
263 
264         if (rets != NULL)
265                 for (i = 1; i < nret; ++i)
266                         rets[i-1] = be32_to_cpu(args.args[nargs+i]);
267 
268         return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
269 }
270 
271 
272 static void __init prom_print(const char *msg)
273 {
274         const char *p, *q;
275 
276         if (prom.stdout == 0)
277                 return;
278 
279         for (p = msg; *p != 0; p = q) {
280                 for (q = p; *q != 0 && *q != '\n'; ++q)
281                         ;
282                 if (q > p)
283                         call_prom("write", 3, 1, prom.stdout, p, q - p);
284                 if (*q == 0)
285                         break;
286                 ++q;
287                 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
288         }
289 }
290 
291 
292 static void __init prom_print_hex(unsigned long val)
293 {
294         int i, nibbles = sizeof(val)*2;
295         char buf[sizeof(val)*2+1];
296 
297         for (i = nibbles-1;  i >= 0;  i--) {
298                 buf[i] = (val & 0xf) + '';
299                 if (buf[i] > '9')
300                         buf[i] += ('a'-''-10);
301                 val >>= 4;
302         }
303         buf[nibbles] = '\0';
304         call_prom("write", 3, 1, prom.stdout, buf, nibbles);
305 }
306 
307 /* max number of decimal digits in an unsigned long */
308 #define UL_DIGITS 21
309 static void __init prom_print_dec(unsigned long val)
310 {
311         int i, size;
312         char buf[UL_DIGITS+1];
313 
314         for (i = UL_DIGITS-1; i >= 0;  i--) {
315                 buf[i] = (val % 10) + '';
316                 val = val/10;
317                 if (val == 0)
318                         break;
319         }
320         /* shift stuff down */
321         size = UL_DIGITS - i;
322         call_prom("write", 3, 1, prom.stdout, buf+i, size);
323 }
324 
325 static void __init prom_printf(const char *format, ...)
326 {
327         const char *p, *q, *s;
328         va_list args;
329         unsigned long v;
330         long vs;
331 
332         va_start(args, format);
333         for (p = format; *p != 0; p = q) {
334                 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
335                         ;
336                 if (q > p)
337                         call_prom("write", 3, 1, prom.stdout, p, q - p);
338                 if (*q == 0)
339                         break;
340                 if (*q == '\n') {
341                         ++q;
342                         call_prom("write", 3, 1, prom.stdout,
343                                   ADDR("\r\n"), 2);
344                         continue;
345                 }
346                 ++q;
347                 if (*q == 0)
348                         break;
349                 switch (*q) {
350                 case 's':
351                         ++q;
352                         s = va_arg(args, const char *);
353                         prom_print(s);
354                         break;
355                 case 'x':
356                         ++q;
357                         v = va_arg(args, unsigned long);
358                         prom_print_hex(v);
359                         break;
360                 case 'd':
361                         ++q;
362                         vs = va_arg(args, int);
363                         if (vs < 0) {
364                                 prom_print("-");
365                                 vs = -vs;
366                         }
367                         prom_print_dec(vs);
368                         break;
369                 case 'l':
370                         ++q;
371                         if (*q == 0)
372                                 break;
373                         else if (*q == 'x') {
374                                 ++q;
375                                 v = va_arg(args, unsigned long);
376                                 prom_print_hex(v);
377                         } else if (*q == 'u') { /* '%lu' */
378                                 ++q;
379                                 v = va_arg(args, unsigned long);
380                                 prom_print_dec(v);
381                         } else if (*q == 'd') { /* %ld */
382                                 ++q;
383                                 vs = va_arg(args, long);
384                                 if (vs < 0) {
385                                         prom_print("-");
386                                         vs = -vs;
387                                 }
388                                 prom_print_dec(vs);
389                         }
390                         break;
391                 }
392         }
393 }
394 
395 
396 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
397                                 unsigned long align)
398 {
399 
400         if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
401                 /*
402                  * Old OF requires we claim physical and virtual separately
403                  * and then map explicitly (assuming virtual mode)
404                  */
405                 int ret;
406                 prom_arg_t result;
407 
408                 ret = call_prom_ret("call-method", 5, 2, &result,
409                                     ADDR("claim"), prom.memory,
410                                     align, size, virt);
411                 if (ret != 0 || result == -1)
412                         return -1;
413                 ret = call_prom_ret("call-method", 5, 2, &result,
414                                     ADDR("claim"), prom.mmumap,
415                                     align, size, virt);
416                 if (ret != 0) {
417                         call_prom("call-method", 4, 1, ADDR("release"),
418                                   prom.memory, size, virt);
419                         return -1;
420                 }
421                 /* the 0x12 is M (coherence) + PP == read/write */
422                 call_prom("call-method", 6, 1,
423                           ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
424                 return virt;
425         }
426         return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
427                          (prom_arg_t)align);
428 }
429 
430 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
431 {
432         prom_print(reason);
433         /* Do not call exit because it clears the screen on pmac
434          * it also causes some sort of double-fault on early pmacs */
435         if (of_platform == PLATFORM_POWERMAC)
436                 asm("trap\n");
437 
438         /* ToDo: should put up an SRC here on pSeries */
439         call_prom("exit", 0, 0);
440 
441         for (;;)                        /* should never get here */
442                 ;
443 }
444 
445 
446 static int __init prom_next_node(phandle *nodep)
447 {
448         phandle node;
449 
450         if ((node = *nodep) != 0
451             && (*nodep = call_prom("child", 1, 1, node)) != 0)
452                 return 1;
453         if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
454                 return 1;
455         for (;;) {
456                 if ((node = call_prom("parent", 1, 1, node)) == 0)
457                         return 0;
458                 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
459                         return 1;
460         }
461 }
462 
463 static int inline prom_getprop(phandle node, const char *pname,
464                                void *value, size_t valuelen)
465 {
466         return call_prom("getprop", 4, 1, node, ADDR(pname),
467                          (u32)(unsigned long) value, (u32) valuelen);
468 }
469 
470 static int inline prom_getproplen(phandle node, const char *pname)
471 {
472         return call_prom("getproplen", 2, 1, node, ADDR(pname));
473 }
474 
475 static void add_string(char **str, const char *q)
476 {
477         char *p = *str;
478 
479         while (*q)
480                 *p++ = *q++;
481         *p++ = ' ';
482         *str = p;
483 }
484 
485 static char *tohex(unsigned int x)
486 {
487         static char digits[] = "0123456789abcdef";
488         static char result[9];
489         int i;
490 
491         result[8] = 0;
492         i = 8;
493         do {
494                 --i;
495                 result[i] = digits[x & 0xf];
496                 x >>= 4;
497         } while (x != 0 && i > 0);
498         return &result[i];
499 }
500 
501 static int __init prom_setprop(phandle node, const char *nodename,
502                                const char *pname, void *value, size_t valuelen)
503 {
504         char cmd[256], *p;
505 
506         if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
507                 return call_prom("setprop", 4, 1, node, ADDR(pname),
508                                  (u32)(unsigned long) value, (u32) valuelen);
509 
510         /* gah... setprop doesn't work on longtrail, have to use interpret */
511         p = cmd;
512         add_string(&p, "dev");
513         add_string(&p, nodename);
514         add_string(&p, tohex((u32)(unsigned long) value));
515         add_string(&p, tohex(valuelen));
516         add_string(&p, tohex(ADDR(pname)));
517         add_string(&p, tohex(strlen(pname)));
518         add_string(&p, "property");
519         *p = 0;
520         return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
521 }
522 
523 /* We can't use the standard versions because of relocation headaches. */
524 #define isxdigit(c)     (('' <= (c) && (c) <= '9') \
525                          || ('a' <= (c) && (c) <= 'f') \
526                          || ('A' <= (c) && (c) <= 'F'))
527 
528 #define isdigit(c)      ('' <= (c) && (c) <= '9')
529 #define islower(c)      ('a' <= (c) && (c) <= 'z')
530 #define toupper(c)      (islower(c) ? ((c) - 'a' + 'A') : (c))
531 
532 static unsigned long prom_strtoul(const char *cp, const char **endp)
533 {
534         unsigned long result = 0, base = 10, value;
535 
536         if (*cp == '') {
537                 base = 8;
538                 cp++;
539                 if (toupper(*cp) == 'X') {
540                         cp++;
541                         base = 16;
542                 }
543         }
544 
545         while (isxdigit(*cp) &&
546                (value = isdigit(*cp) ? *cp - '' : toupper(*cp) - 'A' + 10) < base) {
547                 result = result * base + value;
548                 cp++;
549         }
550 
551         if (endp)
552                 *endp = cp;
553 
554         return result;
555 }
556 
557 static unsigned long prom_memparse(const char *ptr, const char **retptr)
558 {
559         unsigned long ret = prom_strtoul(ptr, retptr);
560         int shift = 0;
561 
562         /*
563          * We can't use a switch here because GCC *may* generate a
564          * jump table which won't work, because we're not running at
565          * the address we're linked at.
566          */
567         if ('G' == **retptr || 'g' == **retptr)
568                 shift = 30;
569 
570         if ('M' == **retptr || 'm' == **retptr)
571                 shift = 20;
572 
573         if ('K' == **retptr || 'k' == **retptr)
574                 shift = 10;
575 
576         if (shift) {
577                 ret <<= shift;
578                 (*retptr)++;
579         }
580 
581         return ret;
582 }
583 
584 /*
585  * Early parsing of the command line passed to the kernel, used for
586  * "mem=x" and the options that affect the iommu
587  */
588 static void __init early_cmdline_parse(void)
589 {
590         const char *opt;
591 
592         char *p;
593         int l = 0;
594 
595         prom_cmd_line[0] = 0;
596         p = prom_cmd_line;
597         if ((long)prom.chosen > 0)
598                 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
599 #ifdef CONFIG_CMDLINE
600         if (l <= 0 || p[0] == '\0') /* dbl check */
601                 strlcpy(prom_cmd_line,
602                         CONFIG_CMDLINE, sizeof(prom_cmd_line));
603 #endif /* CONFIG_CMDLINE */
604         prom_printf("command line: %s\n", prom_cmd_line);
605 
606 #ifdef CONFIG_PPC64
607         opt = strstr(prom_cmd_line, "iommu=");
608         if (opt) {
609                 prom_printf("iommu opt is: %s\n", opt);
610                 opt += 6;
611                 while (*opt && *opt == ' ')
612                         opt++;
613                 if (!strncmp(opt, "off", 3))
614                         prom_iommu_off = 1;
615                 else if (!strncmp(opt, "force", 5))
616                         prom_iommu_force_on = 1;
617         }
618 #endif
619         opt = strstr(prom_cmd_line, "mem=");
620         if (opt) {
621                 opt += 4;
622                 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
623 #ifdef CONFIG_PPC64
624                 /* Align to 16 MB == size of ppc64 large page */
625                 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
626 #endif
627         }
628 }
629 
630 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
631 /*
632  * The architecture vector has an array of PVR mask/value pairs,
633  * followed by # option vectors - 1, followed by the option vectors.
634  *
635  * See prom.h for the definition of the bits specified in the
636  * architecture vector.
637  *
638  * Because the description vector contains a mix of byte and word
639  * values, we declare it as an unsigned char array, and use this
640  * macro to put word values in.
641  */
642 #define W(x)    ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
643                 ((x) >> 8) & 0xff, (x) & 0xff
644 
645 unsigned char ibm_architecture_vec[] = {
646         W(0xfffe0000), W(0x003a0000),   /* POWER5/POWER5+ */
647         W(0xffff0000), W(0x003e0000),   /* POWER6 */
648         W(0xffff0000), W(0x003f0000),   /* POWER7 */
649         W(0xffff0000), W(0x004b0000),   /* POWER8E */
650         W(0xffff0000), W(0x004d0000),   /* POWER8 */
651         W(0xffffffff), W(0x0f000004),   /* all 2.07-compliant */
652         W(0xffffffff), W(0x0f000003),   /* all 2.06-compliant */
653         W(0xffffffff), W(0x0f000002),   /* all 2.05-compliant */
654         W(0xfffffffe), W(0x0f000001),   /* all 2.04-compliant and earlier */
655         6 - 1,                          /* 6 option vectors */
656 
657         /* option vector 1: processor architectures supported */
658         3 - 2,                          /* length */
659         0,                              /* don't ignore, don't halt */
660         OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
661         OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
662 
663         /* option vector 2: Open Firmware options supported */
664         34 - 2,                         /* length */
665         OV2_REAL_MODE,
666         0, 0,
667         W(0xffffffff),                  /* real_base */
668         W(0xffffffff),                  /* real_size */
669         W(0xffffffff),                  /* virt_base */
670         W(0xffffffff),                  /* virt_size */
671         W(0xffffffff),                  /* load_base */
672         W(256),                         /* 256MB min RMA */
673         W(0xffffffff),                  /* full client load */
674         0,                              /* min RMA percentage of total RAM */
675         48,                             /* max log_2(hash table size) */
676 
677         /* option vector 3: processor options supported */
678         3 - 2,                          /* length */
679         0,                              /* don't ignore, don't halt */
680         OV3_FP | OV3_VMX | OV3_DFP,
681 
682         /* option vector 4: IBM PAPR implementation */
683         3 - 2,                          /* length */
684         0,                              /* don't halt */
685         OV4_MIN_ENT_CAP,                /* minimum VP entitled capacity */
686 
687         /* option vector 5: PAPR/OF options */
688         19 - 2,                         /* length */
689         0,                              /* don't ignore, don't halt */
690         OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
691         OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
692 #ifdef CONFIG_PCI_MSI
693         /* PCIe/MSI support.  Without MSI full PCIe is not supported */
694         OV5_FEAT(OV5_MSI),
695 #else
696         0,
697 #endif
698         0,
699 #ifdef CONFIG_PPC_SMLPAR
700         OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
701 #else
702         0,
703 #endif
704         OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
705         0,
706         0,
707         0,
708         /* WARNING: The offset of the "number of cores" field below
709          * must match by the macro below. Update the definition if
710          * the structure layout changes.
711          */
712 #define IBM_ARCH_VEC_NRCORES_OFFSET     125
713         W(NR_CPUS),                     /* number of cores supported */
714         0,
715         0,
716         0,
717         0,
718         OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) |
719         OV5_FEAT(OV5_PFO_HW_842),
720         OV5_FEAT(OV5_SUB_PROCESSORS),
721         /* option vector 6: IBM PAPR hints */
722         4 - 2,                          /* length */
723         0,
724         0,
725         OV6_LINUX,
726 
727 };
728 
729 /* Old method - ELF header with PT_NOTE sections only works on BE */
730 #ifdef __BIG_ENDIAN__
731 static struct fake_elf {
732         Elf32_Ehdr      elfhdr;
733         Elf32_Phdr      phdr[2];
734         struct chrpnote {
735                 u32     namesz;
736                 u32     descsz;
737                 u32     type;
738                 char    name[8];        /* "PowerPC" */
739                 struct chrpdesc {
740                         u32     real_mode;
741                         u32     real_base;
742                         u32     real_size;
743                         u32     virt_base;
744                         u32     virt_size;
745                         u32     load_base;
746                 } chrpdesc;
747         } chrpnote;
748         struct rpanote {
749                 u32     namesz;
750                 u32     descsz;
751                 u32     type;
752                 char    name[24];       /* "IBM,RPA-Client-Config" */
753                 struct rpadesc {
754                         u32     lpar_affinity;
755                         u32     min_rmo_size;
756                         u32     min_rmo_percent;
757                         u32     max_pft_size;
758                         u32     splpar;
759                         u32     min_load;
760                         u32     new_mem_def;
761                         u32     ignore_me;
762                 } rpadesc;
763         } rpanote;
764 } fake_elf = {
765         .elfhdr = {
766                 .e_ident = { 0x7f, 'E', 'L', 'F',
767                              ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
768                 .e_type = ET_EXEC,      /* yeah right */
769                 .e_machine = EM_PPC,
770                 .e_version = EV_CURRENT,
771                 .e_phoff = offsetof(struct fake_elf, phdr),
772                 .e_phentsize = sizeof(Elf32_Phdr),
773                 .e_phnum = 2
774         },
775         .phdr = {
776                 [0] = {
777                         .p_type = PT_NOTE,
778                         .p_offset = offsetof(struct fake_elf, chrpnote),
779                         .p_filesz = sizeof(struct chrpnote)
780                 }, [1] = {
781                         .p_type = PT_NOTE,
782                         .p_offset = offsetof(struct fake_elf, rpanote),
783                         .p_filesz = sizeof(struct rpanote)
784                 }
785         },
786         .chrpnote = {
787                 .namesz = sizeof("PowerPC"),
788                 .descsz = sizeof(struct chrpdesc),
789                 .type = 0x1275,
790                 .name = "PowerPC",
791                 .chrpdesc = {
792                         .real_mode = ~0U,       /* ~0 means "don't care" */
793                         .real_base = ~0U,
794                         .real_size = ~0U,
795                         .virt_base = ~0U,
796                         .virt_size = ~0U,
797                         .load_base = ~0U
798                 },
799         },
800         .rpanote = {
801                 .namesz = sizeof("IBM,RPA-Client-Config"),
802                 .descsz = sizeof(struct rpadesc),
803                 .type = 0x12759999,
804                 .name = "IBM,RPA-Client-Config",
805                 .rpadesc = {
806                         .lpar_affinity = 0,
807                         .min_rmo_size = 64,     /* in megabytes */
808                         .min_rmo_percent = 0,
809                         .max_pft_size = 48,     /* 2^48 bytes max PFT size */
810                         .splpar = 1,
811                         .min_load = ~0U,
812                         .new_mem_def = 0
813                 }
814         }
815 };
816 #endif /* __BIG_ENDIAN__ */
817 
818 static int __init prom_count_smt_threads(void)
819 {
820         phandle node;
821         char type[64];
822         unsigned int plen;
823 
824         /* Pick up th first CPU node we can find */
825         for (node = 0; prom_next_node(&node); ) {
826                 type[0] = 0;
827                 prom_getprop(node, "device_type", type, sizeof(type));
828 
829                 if (strcmp(type, "cpu"))
830                         continue;
831                 /*
832                  * There is an entry for each smt thread, each entry being
833                  * 4 bytes long.  All cpus should have the same number of
834                  * smt threads, so return after finding the first.
835                  */
836                 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
837                 if (plen == PROM_ERROR)
838                         break;
839                 plen >>= 2;
840                 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
841 
842                 /* Sanity check */
843                 if (plen < 1 || plen > 64) {
844                         prom_printf("Threads per core %lu out of bounds, assuming 1\n",
845                                     (unsigned long)plen);
846                         return 1;
847                 }
848                 return plen;
849         }
850         prom_debug("No threads found, assuming 1 per core\n");
851 
852         return 1;
853 
854 }
855 
856 
857 static void __init prom_send_capabilities(void)
858 {
859         ihandle root;
860         prom_arg_t ret;
861         u32 cores;
862         unsigned char *ptcores;
863 
864         root = call_prom("open", 1, 1, ADDR("/"));
865         if (root != 0) {
866                 /* We need to tell the FW about the number of cores we support.
867                  *
868                  * To do that, we count the number of threads on the first core
869                  * (we assume this is the same for all cores) and use it to
870                  * divide NR_CPUS.
871                  */
872 
873                 /* The core value may start at an odd address. If such a word
874                  * access is made at a cache line boundary, this leads to an
875                  * exception which may not be handled at this time.
876                  * Forcing a per byte access to avoid exception.
877                  */
878                 ptcores = &ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET];
879                 cores = 0;
880                 cores |= ptcores[0] << 24;
881                 cores |= ptcores[1] << 16;
882                 cores |= ptcores[2] << 8;
883                 cores |= ptcores[3];
884                 if (cores != NR_CPUS) {
885                         prom_printf("WARNING ! "
886                                     "ibm_architecture_vec structure inconsistent: %lu!\n",
887                                     cores);
888                 } else {
889                         cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
890                         prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
891                                     cores, NR_CPUS);
892                         ptcores[0] = (cores >> 24) & 0xff;
893                         ptcores[1] = (cores >> 16) & 0xff;
894                         ptcores[2] = (cores >> 8) & 0xff;
895                         ptcores[3] = cores & 0xff;
896                 }
897 
898                 /* try calling the ibm,client-architecture-support method */
899                 prom_printf("Calling ibm,client-architecture-support...");
900                 if (call_prom_ret("call-method", 3, 2, &ret,
901                                   ADDR("ibm,client-architecture-support"),
902                                   root,
903                                   ADDR(ibm_architecture_vec)) == 0) {
904                         /* the call exists... */
905                         if (ret)
906                                 prom_printf("\nWARNING: ibm,client-architecture"
907                                             "-support call FAILED!\n");
908                         call_prom("close", 1, 0, root);
909                         prom_printf(" done\n");
910                         return;
911                 }
912                 call_prom("close", 1, 0, root);
913                 prom_printf(" not implemented\n");
914         }
915 
916 #ifdef __BIG_ENDIAN__
917         {
918                 ihandle elfloader;
919 
920                 /* no ibm,client-architecture-support call, try the old way */
921                 elfloader = call_prom("open", 1, 1,
922                                       ADDR("/packages/elf-loader"));
923                 if (elfloader == 0) {
924                         prom_printf("couldn't open /packages/elf-loader\n");
925                         return;
926                 }
927                 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
928                           elfloader, ADDR(&fake_elf));
929                 call_prom("close", 1, 0, elfloader);
930         }
931 #endif /* __BIG_ENDIAN__ */
932 }
933 #endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
934 
935 /*
936  * Memory allocation strategy... our layout is normally:
937  *
938  *  at 14Mb or more we have vmlinux, then a gap and initrd.  In some
939  *  rare cases, initrd might end up being before the kernel though.
940  *  We assume this won't override the final kernel at 0, we have no
941  *  provision to handle that in this version, but it should hopefully
942  *  never happen.
943  *
944  *  alloc_top is set to the top of RMO, eventually shrink down if the
945  *  TCEs overlap
946  *
947  *  alloc_bottom is set to the top of kernel/initrd
948  *
949  *  from there, allocations are done this way : rtas is allocated
950  *  topmost, and the device-tree is allocated from the bottom. We try
951  *  to grow the device-tree allocation as we progress. If we can't,
952  *  then we fail, we don't currently have a facility to restart
953  *  elsewhere, but that shouldn't be necessary.
954  *
955  *  Note that calls to reserve_mem have to be done explicitly, memory
956  *  allocated with either alloc_up or alloc_down isn't automatically
957  *  reserved.
958  */
959 
960 
961 /*
962  * Allocates memory in the RMO upward from the kernel/initrd
963  *
964  * When align is 0, this is a special case, it means to allocate in place
965  * at the current location of alloc_bottom or fail (that is basically
966  * extending the previous allocation). Used for the device-tree flattening
967  */
968 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
969 {
970         unsigned long base = alloc_bottom;
971         unsigned long addr = 0;
972 
973         if (align)
974                 base = _ALIGN_UP(base, align);
975         prom_debug("alloc_up(%x, %x)\n", size, align);
976         if (ram_top == 0)
977                 prom_panic("alloc_up() called with mem not initialized\n");
978 
979         if (align)
980                 base = _ALIGN_UP(alloc_bottom, align);
981         else
982                 base = alloc_bottom;
983 
984         for(; (base + size) <= alloc_top; 
985             base = _ALIGN_UP(base + 0x100000, align)) {
986                 prom_debug("    trying: 0x%x\n\r", base);
987                 addr = (unsigned long)prom_claim(base, size, 0);
988                 if (addr != PROM_ERROR && addr != 0)
989                         break;
990                 addr = 0;
991                 if (align == 0)
992                         break;
993         }
994         if (addr == 0)
995                 return 0;
996         alloc_bottom = addr + size;
997 
998         prom_debug(" -> %x\n", addr);
999         prom_debug("  alloc_bottom : %x\n", alloc_bottom);
1000         prom_debug("  alloc_top    : %x\n", alloc_top);
1001         prom_debug("  alloc_top_hi : %x\n", alloc_top_high);
1002         prom_debug("  rmo_top      : %x\n", rmo_top);
1003         prom_debug("  ram_top      : %x\n", ram_top);
1004 
1005         return addr;
1006 }
1007 
1008 /*
1009  * Allocates memory downward, either from top of RMO, or if highmem
1010  * is set, from the top of RAM.  Note that this one doesn't handle
1011  * failures.  It does claim memory if highmem is not set.
1012  */
1013 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1014                                        int highmem)
1015 {
1016         unsigned long base, addr = 0;
1017 
1018         prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1019                    highmem ? "(high)" : "(low)");
1020         if (ram_top == 0)
1021                 prom_panic("alloc_down() called with mem not initialized\n");
1022 
1023         if (highmem) {
1024                 /* Carve out storage for the TCE table. */
1025                 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1026                 if (addr <= alloc_bottom)
1027                         return 0;
1028                 /* Will we bump into the RMO ? If yes, check out that we
1029                  * didn't overlap existing allocations there, if we did,
1030                  * we are dead, we must be the first in town !
1031                  */
1032                 if (addr < rmo_top) {
1033                         /* Good, we are first */
1034                         if (alloc_top == rmo_top)
1035                                 alloc_top = rmo_top = addr;
1036                         else
1037                                 return 0;
1038                 }
1039                 alloc_top_high = addr;
1040                 goto bail;
1041         }
1042 
1043         base = _ALIGN_DOWN(alloc_top - size, align);
1044         for (; base > alloc_bottom;
1045              base = _ALIGN_DOWN(base - 0x100000, align))  {
1046                 prom_debug("    trying: 0x%x\n\r", base);
1047                 addr = (unsigned long)prom_claim(base, size, 0);
1048                 if (addr != PROM_ERROR && addr != 0)
1049                         break;
1050                 addr = 0;
1051         }
1052         if (addr == 0)
1053                 return 0;
1054         alloc_top = addr;
1055 
1056  bail:
1057         prom_debug(" -> %x\n", addr);
1058         prom_debug("  alloc_bottom : %x\n", alloc_bottom);
1059         prom_debug("  alloc_top    : %x\n", alloc_top);
1060         prom_debug("  alloc_top_hi : %x\n", alloc_top_high);
1061         prom_debug("  rmo_top      : %x\n", rmo_top);
1062         prom_debug("  ram_top      : %x\n", ram_top);
1063 
1064         return addr;
1065 }
1066 
1067 /*
1068  * Parse a "reg" cell
1069  */
1070 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1071 {
1072         cell_t *p = *cellp;
1073         unsigned long r = 0;
1074 
1075         /* Ignore more than 2 cells */
1076         while (s > sizeof(unsigned long) / 4) {
1077                 p++;
1078                 s--;
1079         }
1080         r = be32_to_cpu(*p++);
1081 #ifdef CONFIG_PPC64
1082         if (s > 1) {
1083                 r <<= 32;
1084                 r |= be32_to_cpu(*(p++));
1085         }
1086 #endif
1087         *cellp = p;
1088         return r;
1089 }
1090 
1091 /*
1092  * Very dumb function for adding to the memory reserve list, but
1093  * we don't need anything smarter at this point
1094  *
1095  * XXX Eventually check for collisions.  They should NEVER happen.
1096  * If problems seem to show up, it would be a good start to track
1097  * them down.
1098  */
1099 static void __init reserve_mem(u64 base, u64 size)
1100 {
1101         u64 top = base + size;
1102         unsigned long cnt = mem_reserve_cnt;
1103 
1104         if (size == 0)
1105                 return;
1106 
1107         /* We need to always keep one empty entry so that we
1108          * have our terminator with "size" set to 0 since we are
1109          * dumb and just copy this entire array to the boot params
1110          */
1111         base = _ALIGN_DOWN(base, PAGE_SIZE);
1112         top = _ALIGN_UP(top, PAGE_SIZE);
1113         size = top - base;
1114 
1115         if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1116                 prom_panic("Memory reserve map exhausted !\n");
1117         mem_reserve_map[cnt].base = cpu_to_be64(base);
1118         mem_reserve_map[cnt].size = cpu_to_be64(size);
1119         mem_reserve_cnt = cnt + 1;
1120 }
1121 
1122 /*
1123  * Initialize memory allocation mechanism, parse "memory" nodes and
1124  * obtain that way the top of memory and RMO to setup out local allocator
1125  */
1126 static void __init prom_init_mem(void)
1127 {
1128         phandle node;
1129         char *path, type[64];
1130         unsigned int plen;
1131         cell_t *p, *endp;
1132         __be32 val;
1133         u32 rac, rsc;
1134 
1135         /*
1136          * We iterate the memory nodes to find
1137          * 1) top of RMO (first node)
1138          * 2) top of memory
1139          */
1140         val = cpu_to_be32(2);
1141         prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1142         rac = be32_to_cpu(val);
1143         val = cpu_to_be32(1);
1144         prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1145         rsc = be32_to_cpu(val);
1146         prom_debug("root_addr_cells: %x\n", rac);
1147         prom_debug("root_size_cells: %x\n", rsc);
1148 
1149         prom_debug("scanning memory:\n");
1150         path = prom_scratch;
1151 
1152         for (node = 0; prom_next_node(&node); ) {
1153                 type[0] = 0;
1154                 prom_getprop(node, "device_type", type, sizeof(type));
1155 
1156                 if (type[0] == 0) {
1157                         /*
1158                          * CHRP Longtrail machines have no device_type
1159                          * on the memory node, so check the name instead...
1160                          */
1161                         prom_getprop(node, "name", type, sizeof(type));
1162                 }
1163                 if (strcmp(type, "memory"))
1164                         continue;
1165 
1166                 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1167                 if (plen > sizeof(regbuf)) {
1168                         prom_printf("memory node too large for buffer !\n");
1169                         plen = sizeof(regbuf);
1170                 }
1171                 p = regbuf;
1172                 endp = p + (plen / sizeof(cell_t));
1173 
1174 #ifdef DEBUG_PROM
1175                 memset(path, 0, PROM_SCRATCH_SIZE);
1176                 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1177                 prom_debug("  node %s :\n", path);
1178 #endif /* DEBUG_PROM */
1179 
1180                 while ((endp - p) >= (rac + rsc)) {
1181                         unsigned long base, size;
1182 
1183                         base = prom_next_cell(rac, &p);
1184                         size = prom_next_cell(rsc, &p);
1185 
1186                         if (size == 0)
1187                                 continue;
1188                         prom_debug("    %x %x\n", base, size);
1189                         if (base == 0 && (of_platform & PLATFORM_LPAR))
1190                                 rmo_top = size;
1191                         if ((base + size) > ram_top)
1192                                 ram_top = base + size;
1193                 }
1194         }
1195 
1196         alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1197 
1198         /*
1199          * If prom_memory_limit is set we reduce the upper limits *except* for
1200          * alloc_top_high. This must be the real top of RAM so we can put
1201          * TCE's up there.
1202          */
1203 
1204         alloc_top_high = ram_top;
1205 
1206         if (prom_memory_limit) {
1207                 if (prom_memory_limit <= alloc_bottom) {
1208                         prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1209                                 prom_memory_limit);
1210                         prom_memory_limit = 0;
1211                 } else if (prom_memory_limit >= ram_top) {
1212                         prom_printf("Ignoring mem=%x >= ram_top.\n",
1213                                 prom_memory_limit);
1214                         prom_memory_limit = 0;
1215                 } else {
1216                         ram_top = prom_memory_limit;
1217                         rmo_top = min(rmo_top, prom_memory_limit);
1218                 }
1219         }
1220 
1221         /*
1222          * Setup our top alloc point, that is top of RMO or top of
1223          * segment 0 when running non-LPAR.
1224          * Some RS64 machines have buggy firmware where claims up at
1225          * 1GB fail.  Cap at 768MB as a workaround.
1226          * Since 768MB is plenty of room, and we need to cap to something
1227          * reasonable on 32-bit, cap at 768MB on all machines.
1228          */
1229         if (!rmo_top)
1230                 rmo_top = ram_top;
1231         rmo_top = min(0x30000000ul, rmo_top);
1232         alloc_top = rmo_top;
1233         alloc_top_high = ram_top;
1234 
1235         /*
1236          * Check if we have an initrd after the kernel but still inside
1237          * the RMO.  If we do move our bottom point to after it.
1238          */
1239         if (prom_initrd_start &&
1240             prom_initrd_start < rmo_top &&
1241             prom_initrd_end > alloc_bottom)
1242                 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1243 
1244         prom_printf("memory layout at init:\n");
1245         prom_printf("  memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1246         prom_printf("  alloc_bottom : %x\n", alloc_bottom);
1247         prom_printf("  alloc_top    : %x\n", alloc_top);
1248         prom_printf("  alloc_top_hi : %x\n", alloc_top_high);
1249         prom_printf("  rmo_top      : %x\n", rmo_top);
1250         prom_printf("  ram_top      : %x\n", ram_top);
1251 }
1252 
1253 static void __init prom_close_stdin(void)
1254 {
1255         __be32 val;
1256         ihandle stdin;
1257 
1258         if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1259                 stdin = be32_to_cpu(val);
1260                 call_prom("close", 1, 0, stdin);
1261         }
1262 }
1263 
1264 #ifdef CONFIG_PPC_POWERNV
1265 
1266 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1267 static u64 __initdata prom_opal_base;
1268 static u64 __initdata prom_opal_entry;
1269 #endif
1270 
1271 #ifdef __BIG_ENDIAN__
1272 /* XXX Don't change this structure without updating opal-takeover.S */
1273 static struct opal_secondary_data {
1274         s64                             ack;    /*  0 */
1275         u64                             go;     /*  8 */
1276         struct opal_takeover_args       args;   /* 16 */
1277 } opal_secondary_data;
1278 
1279 static u64 __initdata prom_opal_align;
1280 static u64 __initdata prom_opal_size;
1281 static int __initdata prom_rtas_start_cpu;
1282 static u64 __initdata prom_rtas_data;
1283 static u64 __initdata prom_rtas_entry;
1284 
1285 extern char opal_secondary_entry;
1286 
1287 static void __init prom_query_opal(void)
1288 {
1289         long rc;
1290 
1291         /* We must not query for OPAL presence on a machine that
1292          * supports TNK takeover (970 blades), as this uses the same
1293          * h-call with different arguments and will crash
1294          */
1295         if (PHANDLE_VALID(call_prom("finddevice", 1, 1,
1296                                     ADDR("/tnk-memory-map")))) {
1297                 prom_printf("TNK takeover detected, skipping OPAL check\n");
1298                 return;
1299         }
1300 
1301         prom_printf("Querying for OPAL presence... ");
1302 
1303         rc = opal_query_takeover(&prom_opal_size,
1304                                  &prom_opal_align);
1305         prom_debug("(rc = %ld) ", rc);
1306         if (rc != 0) {
1307                 prom_printf("not there.\n");
1308                 return;
1309         }
1310         of_platform = PLATFORM_OPAL;
1311         prom_printf(" there !\n");
1312         prom_debug("  opal_size  = 0x%lx\n", prom_opal_size);
1313         prom_debug("  opal_align = 0x%lx\n", prom_opal_align);
1314         if (prom_opal_align < 0x10000)
1315                 prom_opal_align = 0x10000;
1316 }
1317 
1318 static int __init prom_rtas_call(int token, int nargs, int nret,
1319                                  int *outputs, ...)
1320 {
1321         struct rtas_args rtas_args;
1322         va_list list;
1323         int i;
1324 
1325         rtas_args.token = token;
1326         rtas_args.nargs = nargs;
1327         rtas_args.nret  = nret;
1328         rtas_args.rets  = (rtas_arg_t *)&(rtas_args.args[nargs]);
1329         va_start(list, outputs);
1330         for (i = 0; i < nargs; ++i)
1331                 rtas_args.args[i] = va_arg(list, rtas_arg_t);
1332         va_end(list);
1333 
1334         for (i = 0; i < nret; ++i)
1335                 rtas_args.rets[i] = 0;
1336 
1337         opal_enter_rtas(&rtas_args, prom_rtas_data,
1338                         prom_rtas_entry);
1339 
1340         if (nret > 1 && outputs != NULL)
1341                 for (i = 0; i < nret-1; ++i)
1342                         outputs[i] = rtas_args.rets[i+1];
1343         return (nret > 0)? rtas_args.rets[0]: 0;
1344 }
1345 
1346 static void __init prom_opal_hold_cpus(void)
1347 {
1348         int i, cnt, cpu, rc;
1349         long j;
1350         phandle node;
1351         char type[64];
1352         u32 servers[8];
1353         void *entry = (unsigned long *)&opal_secondary_entry;
1354         struct opal_secondary_data *data = &opal_secondary_data;
1355 
1356         prom_debug("prom_opal_hold_cpus: start...\n");
1357         prom_debug("    - entry       = 0x%x\n", entry);
1358         prom_debug("    - data        = 0x%x\n", data);
1359 
1360         data->ack = -1;
1361         data->go = 0;
1362 
1363         /* look for cpus */
1364         for (node = 0; prom_next_node(&node); ) {
1365                 type[0] = 0;
1366                 prom_getprop(node, "device_type", type, sizeof(type));
1367                 if (strcmp(type, "cpu") != 0)
1368                         continue;
1369 
1370                 /* Skip non-configured cpus. */
1371                 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1372                         if (strcmp(type, "okay") != 0)
1373                                 continue;
1374 
1375                 cnt = prom_getprop(node, "ibm,ppc-interrupt-server#s", servers,
1376                              sizeof(servers));
1377                 if (cnt == PROM_ERROR)
1378                         break;
1379                 cnt >>= 2;
1380                 for (i = 0; i < cnt; i++) {
1381                         cpu = servers[i];
1382                         prom_debug("CPU %d ... ", cpu);
1383                         if (cpu == prom.cpu) {
1384                                 prom_debug("booted !\n");
1385                                 continue;
1386                         }
1387                         prom_debug("starting ... ");
1388 
1389                         /* Init the acknowledge var which will be reset by
1390                          * the secondary cpu when it awakens from its OF
1391                          * spinloop.
1392                          */
1393                         data->ack = -1;
1394                         rc = prom_rtas_call(prom_rtas_start_cpu, 3, 1,
1395                                             NULL, cpu, entry, data);
1396                         prom_debug("rtas rc=%d ...", rc);
1397 
1398                         for (j = 0; j < 100000000 && data->ack == -1; j++) {
1399                                 HMT_low();
1400                                 mb();
1401                         }
1402                         HMT_medium();
1403                         if (data->ack != -1)
1404                                 prom_debug("done, PIR=0x%x\n", data->ack);
1405                         else
1406                                 prom_debug("timeout !\n");
1407                 }
1408         }
1409         prom_debug("prom_opal_hold_cpus: end...\n");
1410 }
1411 
1412 static void __init prom_opal_takeover(void)
1413 {
1414         struct opal_secondary_data *data = &opal_secondary_data;
1415         struct opal_takeover_args *args = &data->args;
1416         u64 align = prom_opal_align;
1417         u64 top_addr, opal_addr;
1418 
1419         args->k_image   = (u64)_stext;
1420         args->k_size    = _end - _stext;
1421         args->k_entry   = 0;
1422         args->k_entry2  = 0x60;
1423 
1424         top_addr = _ALIGN_UP(args->k_size, align);
1425 
1426         if (prom_initrd_start != 0) {
1427                 args->rd_image = prom_initrd_start;
1428                 args->rd_size = prom_initrd_end - args->rd_image;
1429                 args->rd_loc = top_addr;
1430                 top_addr = _ALIGN_UP(args->rd_loc + args->rd_size, align);
1431         }
1432 
1433         /* Pickup an address for the HAL. We want to go really high
1434          * up to avoid problem with future kexecs. On the other hand
1435          * we don't want to be all over the TCEs on P5IOC2 machines
1436          * which are going to be up there too. We assume the machine
1437          * has plenty of memory, and we ask for the HAL for now to
1438          * be just below the 1G point, or above the initrd
1439          */
1440         opal_addr = _ALIGN_DOWN(0x40000000 - prom_opal_size, align);
1441         if (opal_addr < top_addr)
1442                 opal_addr = top_addr;
1443         args->hal_addr = opal_addr;
1444 
1445         /* Copy the command line to the kernel image */
1446         strlcpy(boot_command_line, prom_cmd_line,
1447                 COMMAND_LINE_SIZE);
1448 
1449         prom_debug("  k_image    = 0x%lx\n", args->k_image);
1450         prom_debug("  k_size     = 0x%lx\n", args->k_size);
1451         prom_debug("  k_entry    = 0x%lx\n", args->k_entry);
1452         prom_debug("  k_entry2   = 0x%lx\n", args->k_entry2);
1453         prom_debug("  hal_addr   = 0x%lx\n", args->hal_addr);
1454         prom_debug("  rd_image   = 0x%lx\n", args->rd_image);
1455         prom_debug("  rd_size    = 0x%lx\n", args->rd_size);
1456         prom_debug("  rd_loc     = 0x%lx\n", args->rd_loc);
1457         prom_printf("Performing OPAL takeover,this can take a few minutes..\n");
1458         prom_close_stdin();
1459         mb();
1460         data->go = 1;
1461         for (;;)
1462                 opal_do_takeover(args);
1463 }
1464 #endif /* __BIG_ENDIAN__ */
1465 
1466 /*
1467  * Allocate room for and instantiate OPAL
1468  */
1469 static void __init prom_instantiate_opal(void)
1470 {
1471         phandle opal_node;
1472         ihandle opal_inst;
1473         u64 base, entry;
1474         u64 size = 0, align = 0x10000;
1475         __be64 val64;
1476         u32 rets[2];
1477 
1478         prom_debug("prom_instantiate_opal: start...\n");
1479 
1480         opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1481         prom_debug("opal_node: %x\n", opal_node);
1482         if (!PHANDLE_VALID(opal_node))
1483                 return;
1484 
1485         val64 = 0;
1486         prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
1487         size = be64_to_cpu(val64);
1488         if (size == 0)
1489                 return;
1490         val64 = 0;
1491         prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
1492         align = be64_to_cpu(val64);
1493 
1494         base = alloc_down(size, align, 0);
1495         if (base == 0) {
1496                 prom_printf("OPAL allocation failed !\n");
1497                 return;
1498         }
1499 
1500         opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1501         if (!IHANDLE_VALID(opal_inst)) {
1502                 prom_printf("opening opal package failed (%x)\n", opal_inst);
1503                 return;
1504         }
1505 
1506         prom_printf("instantiating opal at 0x%x...", base);
1507 
1508         if (call_prom_ret("call-method", 4, 3, rets,
1509                           ADDR("load-opal-runtime"),
1510                           opal_inst,
1511                           base >> 32, base & 0xffffffff) != 0
1512             || (rets[0] == 0 && rets[1] == 0)) {
1513                 prom_printf(" failed\n");
1514                 return;
1515         }
1516         entry = (((u64)rets[0]) << 32) | rets[1];
1517 
1518         prom_printf(" done\n");
1519 
1520         reserve_mem(base, size);
1521 
1522         prom_debug("opal base     = 0x%x\n", base);
1523         prom_debug("opal align    = 0x%x\n", align);
1524         prom_debug("opal entry    = 0x%x\n", entry);
1525         prom_debug("opal size     = 0x%x\n", (long)size);
1526 
1527         prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1528                      &base, sizeof(base));
1529         prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1530                      &entry, sizeof(entry));
1531 
1532 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1533         prom_opal_base = base;
1534         prom_opal_entry = entry;
1535 #endif
1536         prom_debug("prom_instantiate_opal: end...\n");
1537 }
1538 
1539 #endif /* CONFIG_PPC_POWERNV */
1540 
1541 /*
1542  * Allocate room for and instantiate RTAS
1543  */
1544 static void __init prom_instantiate_rtas(void)
1545 {
1546         phandle rtas_node;
1547         ihandle rtas_inst;
1548         u32 base, entry = 0;
1549         __be32 val;
1550         u32 size = 0;
1551 
1552         prom_debug("prom_instantiate_rtas: start...\n");
1553 
1554         rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1555         prom_debug("rtas_node: %x\n", rtas_node);
1556         if (!PHANDLE_VALID(rtas_node))
1557                 return;
1558 
1559         val = 0;
1560         prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1561         size = be32_to_cpu(val);
1562         if (size == 0)
1563                 return;
1564 
1565         base = alloc_down(size, PAGE_SIZE, 0);
1566         if (base == 0)
1567                 prom_panic("Could not allocate memory for RTAS\n");
1568 
1569         rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1570         if (!IHANDLE_VALID(rtas_inst)) {
1571                 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1572                 return;
1573         }
1574 
1575         prom_printf("instantiating rtas at 0x%x...", base);
1576 
1577         if (call_prom_ret("call-method", 3, 2, &entry,
1578                           ADDR("instantiate-rtas"),
1579                           rtas_inst, base) != 0
1580             || entry == 0) {
1581                 prom_printf(" failed\n");
1582                 return;
1583         }
1584         prom_printf(" done\n");
1585 
1586         reserve_mem(base, size);
1587 
1588         val = cpu_to_be32(base);
1589         prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1590                      &val, sizeof(val));
1591         val = cpu_to_be32(entry);
1592         prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1593                      &val, sizeof(val));
1594 
1595         /* Check if it supports "query-cpu-stopped-state" */
1596         if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1597                          &val, sizeof(val)) != PROM_ERROR)
1598                 rtas_has_query_cpu_stopped = true;
1599 
1600 #if defined(CONFIG_PPC_POWERNV) && defined(__BIG_ENDIAN__)
1601         /* PowerVN takeover hack */
1602         prom_rtas_data = base;
1603         prom_rtas_entry = entry;
1604         prom_getprop(rtas_node, "start-cpu", &prom_rtas_start_cpu, 4);
1605 #endif
1606         prom_debug("rtas base     = 0x%x\n", base);
1607         prom_debug("rtas entry    = 0x%x\n", entry);
1608         prom_debug("rtas size     = 0x%x\n", (long)size);
1609 
1610         prom_debug("prom_instantiate_rtas: end...\n");
1611 }
1612 
1613 #ifdef CONFIG_PPC64
1614 /*
1615  * Allocate room for and instantiate Stored Measurement Log (SML)
1616  */
1617 static void __init prom_instantiate_sml(void)
1618 {
1619         phandle ibmvtpm_node;
1620         ihandle ibmvtpm_inst;
1621         u32 entry = 0, size = 0;
1622         u64 base;
1623 
1624         prom_debug("prom_instantiate_sml: start...\n");
1625 
1626         ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/ibm,vtpm"));
1627         prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1628         if (!PHANDLE_VALID(ibmvtpm_node))
1629                 return;
1630 
1631         ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/ibm,vtpm"));
1632         if (!IHANDLE_VALID(ibmvtpm_inst)) {
1633                 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1634                 return;
1635         }
1636 
1637         if (call_prom_ret("call-method", 2, 2, &size,
1638                           ADDR("sml-get-handover-size"),
1639                           ibmvtpm_inst) != 0 || size == 0) {
1640                 prom_printf("SML get handover size failed\n");
1641                 return;
1642         }
1643 
1644         base = alloc_down(size, PAGE_SIZE, 0);
1645         if (base == 0)
1646                 prom_panic("Could not allocate memory for sml\n");
1647 
1648         prom_printf("instantiating sml at 0x%x...", base);
1649 
1650         if (call_prom_ret("call-method", 4, 2, &entry,
1651                           ADDR("sml-handover"),
1652                           ibmvtpm_inst, size, base) != 0 || entry == 0) {
1653                 prom_printf("SML handover failed\n");
1654                 return;
1655         }
1656         prom_printf(" done\n");
1657 
1658         reserve_mem(base, size);
1659 
1660         prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-base",
1661                      &base, sizeof(base));
1662         prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-size",
1663                      &size, sizeof(size));
1664 
1665         prom_debug("sml base     = 0x%x\n", base);
1666         prom_debug("sml size     = 0x%x\n", (long)size);
1667 
1668         prom_debug("prom_instantiate_sml: end...\n");
1669 }
1670 
1671 /*
1672  * Allocate room for and initialize TCE tables
1673  */
1674 #ifdef __BIG_ENDIAN__
1675 static void __init prom_initialize_tce_table(void)
1676 {
1677         phandle node;
1678         ihandle phb_node;
1679         char compatible[64], type[64], model[64];
1680         char *path = prom_scratch;
1681         u64 base, align;
1682         u32 minalign, minsize;
1683         u64 tce_entry, *tce_entryp;
1684         u64 local_alloc_top, local_alloc_bottom;
1685         u64 i;
1686 
1687         if (prom_iommu_off)
1688                 return;
1689 
1690         prom_debug("starting prom_initialize_tce_table\n");
1691 
1692         /* Cache current top of allocs so we reserve a single block */
1693         local_alloc_top = alloc_top_high;
1694         local_alloc_bottom = local_alloc_top;
1695 
1696         /* Search all nodes looking for PHBs. */
1697         for (node = 0; prom_next_node(&node); ) {
1698                 compatible[0] = 0;
1699                 type[0] = 0;
1700                 model[0] = 0;
1701                 prom_getprop(node, "compatible",
1702                              compatible, sizeof(compatible));
1703                 prom_getprop(node, "device_type", type, sizeof(type));
1704                 prom_getprop(node, "model", model, sizeof(model));
1705 
1706                 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1707                         continue;
1708 
1709                 /* Keep the old logic intact to avoid regression. */
1710                 if (compatible[0] != 0) {
1711                         if ((strstr(compatible, "python") == NULL) &&
1712                             (strstr(compatible, "Speedwagon") == NULL) &&
1713                             (strstr(compatible, "Winnipeg") == NULL))
1714                                 continue;
1715                 } else if (model[0] != 0) {
1716                         if ((strstr(model, "ython") == NULL) &&
1717                             (strstr(model, "peedwagon") == NULL) &&
1718                             (strstr(model, "innipeg") == NULL))
1719                                 continue;
1720                 }
1721 
1722                 if (prom_getprop(node, "tce-table-minalign", &minalign,
1723                                  sizeof(minalign)) == PROM_ERROR)
1724                         minalign = 0;
1725                 if (prom_getprop(node, "tce-table-minsize", &minsize,
1726                                  sizeof(minsize)) == PROM_ERROR)
1727                         minsize = 4UL << 20;
1728 
1729                 /*
1730                  * Even though we read what OF wants, we just set the table
1731                  * size to 4 MB.  This is enough to map 2GB of PCI DMA space.
1732                  * By doing this, we avoid the pitfalls of trying to DMA to
1733                  * MMIO space and the DMA alias hole.
1734                  *
1735                  * On POWER4, firmware sets the TCE region by assuming
1736                  * each TCE table is 8MB. Using this memory for anything
1737                  * else will impact performance, so we always allocate 8MB.
1738                  * Anton
1739                  */
1740                 if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
1741                         minsize = 8UL << 20;
1742                 else
1743                         minsize = 4UL << 20;
1744 
1745                 /* Align to the greater of the align or size */
1746                 align = max(minalign, minsize);
1747                 base = alloc_down(minsize, align, 1);
1748                 if (base == 0)
1749                         prom_panic("ERROR, cannot find space for TCE table.\n");
1750                 if (base < local_alloc_bottom)
1751                         local_alloc_bottom = base;
1752 
1753                 /* It seems OF doesn't null-terminate the path :-( */
1754                 memset(path, 0, PROM_SCRATCH_SIZE);
1755                 /* Call OF to setup the TCE hardware */
1756                 if (call_prom("package-to-path", 3, 1, node,
1757                               path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1758                         prom_printf("package-to-path failed\n");
1759                 }
1760 
1761                 /* Save away the TCE table attributes for later use. */
1762                 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1763                 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1764 
1765                 prom_debug("TCE table: %s\n", path);
1766                 prom_debug("\tnode = 0x%x\n", node);
1767                 prom_debug("\tbase = 0x%x\n", base);
1768                 prom_debug("\tsize = 0x%x\n", minsize);
1769 
1770                 /* Initialize the table to have a one-to-one mapping
1771                  * over the allocated size.
1772                  */
1773                 tce_entryp = (u64 *)base;
1774                 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1775                         tce_entry = (i << PAGE_SHIFT);
1776                         tce_entry |= 0x3;
1777                         *tce_entryp = tce_entry;
1778                 }
1779 
1780                 prom_printf("opening PHB %s", path);
1781                 phb_node = call_prom("open", 1, 1, path);
1782                 if (phb_node == 0)
1783                         prom_printf("... failed\n");
1784                 else
1785                         prom_printf("... done\n");
1786 
1787                 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1788                           phb_node, -1, minsize,
1789                           (u32) base, (u32) (base >> 32));
1790                 call_prom("close", 1, 0, phb_node);
1791         }
1792 
1793         reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1794 
1795         /* These are only really needed if there is a memory limit in
1796          * effect, but we don't know so export them always. */
1797         prom_tce_alloc_start = local_alloc_bottom;
1798         prom_tce_alloc_end = local_alloc_top;
1799 
1800         /* Flag the first invalid entry */
1801         prom_debug("ending prom_initialize_tce_table\n");
1802 }
1803 #endif /* __BIG_ENDIAN__ */
1804 #endif /* CONFIG_PPC64 */
1805 
1806 /*
1807  * With CHRP SMP we need to use the OF to start the other processors.
1808  * We can't wait until smp_boot_cpus (the OF is trashed by then)
1809  * so we have to put the processors into a holding pattern controlled
1810  * by the kernel (not OF) before we destroy the OF.
1811  *
1812  * This uses a chunk of low memory, puts some holding pattern
1813  * code there and sends the other processors off to there until
1814  * smp_boot_cpus tells them to do something.  The holding pattern
1815  * checks that address until its cpu # is there, when it is that
1816  * cpu jumps to __secondary_start().  smp_boot_cpus() takes care
1817  * of setting those values.
1818  *
1819  * We also use physical address 0x4 here to tell when a cpu
1820  * is in its holding pattern code.
1821  *
1822  * -- Cort
1823  */
1824 /*
1825  * We want to reference the copy of __secondary_hold_* in the
1826  * 0 - 0x100 address range
1827  */
1828 #define LOW_ADDR(x)     (((unsigned long) &(x)) & 0xff)
1829 
1830 static void __init prom_hold_cpus(void)
1831 {
1832         unsigned long i;
1833         phandle node;
1834         char type[64];
1835         unsigned long *spinloop
1836                 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1837         unsigned long *acknowledge
1838                 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1839         unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1840 
1841         /*
1842          * On pseries, if RTAS supports "query-cpu-stopped-state",
1843          * we skip this stage, the CPUs will be started by the
1844          * kernel using RTAS.
1845          */
1846         if ((of_platform == PLATFORM_PSERIES ||
1847              of_platform == PLATFORM_PSERIES_LPAR) &&
1848             rtas_has_query_cpu_stopped) {
1849                 prom_printf("prom_hold_cpus: skipped\n");
1850                 return;
1851         }
1852 
1853         prom_debug("prom_hold_cpus: start...\n");
1854         prom_debug("    1) spinloop       = 0x%x\n", (unsigned long)spinloop);
1855         prom_debug("    1) *spinloop      = 0x%x\n", *spinloop);
1856         prom_debug("    1) acknowledge    = 0x%x\n",
1857                    (unsigned long)acknowledge);
1858         prom_debug("    1) *acknowledge   = 0x%x\n", *acknowledge);
1859         prom_debug("    1) secondary_hold = 0x%x\n", secondary_hold);
1860 
1861         /* Set the common spinloop variable, so all of the secondary cpus
1862          * will block when they are awakened from their OF spinloop.
1863          * This must occur for both SMP and non SMP kernels, since OF will
1864          * be trashed when we move the kernel.
1865          */
1866         *spinloop = 0;
1867 
1868         /* look for cpus */
1869         for (node = 0; prom_next_node(&node); ) {
1870                 unsigned int cpu_no;
1871                 __be32 reg;
1872 
1873                 type[0] = 0;
1874                 prom_getprop(node, "device_type", type, sizeof(type));
1875                 if (strcmp(type, "cpu") != 0)
1876                         continue;
1877 
1878                 /* Skip non-configured cpus. */
1879                 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1880                         if (strcmp(type, "okay") != 0)
1881                                 continue;
1882 
1883                 reg = cpu_to_be32(-1); /* make sparse happy */
1884                 prom_getprop(node, "reg", &reg, sizeof(reg));
1885                 cpu_no = be32_to_cpu(reg);
1886 
1887                 prom_debug("cpu hw idx   = %lu\n", cpu_no);
1888 
1889                 /* Init the acknowledge var which will be reset by
1890                  * the secondary cpu when it awakens from its OF
1891                  * spinloop.
1892                  */
1893                 *acknowledge = (unsigned long)-1;
1894 
1895                 if (cpu_no != prom.cpu) {
1896                         /* Primary Thread of non-boot cpu or any thread */
1897                         prom_printf("starting cpu hw idx %lu... ", cpu_no);
1898                         call_prom("start-cpu", 3, 0, node,
1899                                   secondary_hold, cpu_no);
1900 
1901                         for (i = 0; (i < 100000000) && 
1902                              (*acknowledge == ((unsigned long)-1)); i++ )
1903                                 mb();
1904 
1905                         if (*acknowledge == cpu_no)
1906                                 prom_printf("done\n");
1907                         else
1908                                 prom_printf("failed: %x\n", *acknowledge);
1909                 }
1910 #ifdef CONFIG_SMP
1911                 else
1912                         prom_printf("boot cpu hw idx %lu\n", cpu_no);
1913 #endif /* CONFIG_SMP */
1914         }
1915 
1916         prom_debug("prom_hold_cpus: end...\n");
1917 }
1918 
1919 
1920 static void __init prom_init_client_services(unsigned long pp)
1921 {
1922         /* Get a handle to the prom entry point before anything else */
1923         prom_entry = pp;
1924 
1925         /* get a handle for the stdout device */
1926         prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1927         if (!PHANDLE_VALID(prom.chosen))
1928                 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1929 
1930         /* get device tree root */
1931         prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
1932         if (!PHANDLE_VALID(prom.root))
1933                 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1934 
1935         prom.mmumap = 0;
1936 }
1937 
1938 #ifdef CONFIG_PPC32
1939 /*
1940  * For really old powermacs, we need to map things we claim.
1941  * For that, we need the ihandle of the mmu.
1942  * Also, on the longtrail, we need to work around other bugs.
1943  */
1944 static void __init prom_find_mmu(void)
1945 {
1946         phandle oprom;
1947         char version[64];
1948 
1949         oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1950         if (!PHANDLE_VALID(oprom))
1951                 return;
1952         if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1953                 return;
1954         version[sizeof(version) - 1] = 0;
1955         /* XXX might need to add other versions here */
1956         if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1957                 of_workarounds = OF_WA_CLAIM;
1958         else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1959                 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1960                 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1961         } else
1962                 return;
1963         prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
1964         prom_getprop(prom.chosen, "mmu", &prom.mmumap,
1965                      sizeof(prom.mmumap));
1966         prom.mmumap = be32_to_cpu(prom.mmumap);
1967         if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
1968                 of_workarounds &= ~OF_WA_CLAIM;         /* hmmm */
1969 }
1970 #else
1971 #define prom_find_mmu()
1972 #endif
1973 
1974 static void __init prom_init_stdout(void)
1975 {
1976         char *path = of_stdout_device;
1977         char type[16];
1978         phandle stdout_node;
1979         __be32 val;
1980 
1981         if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
1982                 prom_panic("cannot find stdout");
1983 
1984         prom.stdout = be32_to_cpu(val);
1985 
1986         /* Get the full OF pathname of the stdout device */
1987         memset(path, 0, 256);
1988         call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
1989         prom_printf("OF stdout device is: %s\n", of_stdout_device);
1990         prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
1991                      path, strlen(path) + 1);
1992 
1993         /* instance-to-package fails on PA-Semi */
1994         stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
1995         if (stdout_node != PROM_ERROR) {
1996                 val = cpu_to_be32(stdout_node);
1997                 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
1998                              &val, sizeof(val));
1999 
2000                 /* If it's a display, note it */
2001                 memset(type, 0, sizeof(type));
2002                 prom_getprop(stdout_node, "device_type", type, sizeof(type));
2003                 if (strcmp(type, "display") == 0)
2004                         prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
2005         }
2006 }
2007 
2008 static int __init prom_find_machine_type(void)
2009 {
2010         char compat[256];
2011         int len, i = 0;
2012 #ifdef CONFIG_PPC64
2013         phandle rtas;
2014         int x;
2015 #endif
2016 
2017         /* Look for a PowerMac or a Cell */
2018         len = prom_getprop(prom.root, "compatible",
2019                            compat, sizeof(compat)-1);
2020         if (len > 0) {
2021                 compat[len] = 0;
2022                 while (i < len) {
2023                         char *p = &compat[i];
2024                         int sl = strlen(p);
2025                         if (sl == 0)
2026                                 break;
2027                         if (strstr(p, "Power Macintosh") ||
2028                             strstr(p, "MacRISC"))
2029                                 return PLATFORM_POWERMAC;
2030 #ifdef CONFIG_PPC64
2031                         /* We must make sure we don't detect the IBM Cell
2032                          * blades as pSeries due to some firmware issues,
2033                          * so we do it here.
2034                          */
2035                         if (strstr(p, "IBM,CBEA") ||
2036                             strstr(p, "IBM,CPBW-1.0"))
2037                                 return PLATFORM_GENERIC;
2038 #endif /* CONFIG_PPC64 */
2039                         i += sl + 1;
2040                 }
2041         }
2042 #ifdef CONFIG_PPC64
2043         /* Try to detect OPAL */
2044         if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
2045                 return PLATFORM_OPAL;
2046 
2047         /* Try to figure out if it's an IBM pSeries or any other
2048          * PAPR compliant platform. We assume it is if :
2049          *  - /device_type is "chrp" (please, do NOT use that for future
2050          *    non-IBM designs !
2051          *  - it has /rtas
2052          */
2053         len = prom_getprop(prom.root, "device_type",
2054                            compat, sizeof(compat)-1);
2055         if (len <= 0)
2056                 return PLATFORM_GENERIC;
2057         if (strcmp(compat, "chrp"))
2058                 return PLATFORM_GENERIC;
2059 
2060         /* Default to pSeries. We need to know if we are running LPAR */
2061         rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
2062         if (!PHANDLE_VALID(rtas))
2063                 return PLATFORM_GENERIC;
2064         x = prom_getproplen(rtas, "ibm,hypertas-functions");
2065         if (x != PROM_ERROR) {
2066                 prom_debug("Hypertas detected, assuming LPAR !\n");
2067                 return PLATFORM_PSERIES_LPAR;
2068         }
2069         return PLATFORM_PSERIES;
2070 #else
2071         return PLATFORM_GENERIC;
2072 #endif
2073 }
2074 
2075 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2076 {
2077         return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2078 }
2079 
2080 /*
2081  * If we have a display that we don't know how to drive,
2082  * we will want to try to execute OF's open method for it
2083  * later.  However, OF will probably fall over if we do that
2084  * we've taken over the MMU.
2085  * So we check whether we will need to open the display,
2086  * and if so, open it now.
2087  */
2088 static void __init prom_check_displays(void)
2089 {
2090         char type[16], *path;
2091         phandle node;
2092         ihandle ih;
2093         int i;
2094 
2095         static unsigned char default_colors[] = {
2096                 0x00, 0x00, 0x00,
2097                 0x00, 0x00, 0xaa,
2098                 0x00, 0xaa, 0x00,
2099                 0x00, 0xaa, 0xaa,
2100                 0xaa, 0x00, 0x00,
2101                 0xaa, 0x00, 0xaa,
2102                 0xaa, 0xaa, 0x00,
2103                 0xaa, 0xaa, 0xaa,
2104                 0x55, 0x55, 0x55,
2105                 0x55, 0x55, 0xff,
2106                 0x55, 0xff, 0x55,
2107                 0x55, 0xff, 0xff,
2108                 0xff, 0x55, 0x55,
2109                 0xff, 0x55, 0xff,
2110                 0xff, 0xff, 0x55,
2111                 0xff, 0xff, 0xff
2112         };
2113         const unsigned char *clut;
2114 
2115         prom_debug("Looking for displays\n");
2116         for (node = 0; prom_next_node(&node); ) {
2117                 memset(type, 0, sizeof(type));
2118                 prom_getprop(node, "device_type", type, sizeof(type));
2119                 if (strcmp(type, "display") != 0)
2120                         continue;
2121 
2122                 /* It seems OF doesn't null-terminate the path :-( */
2123                 path = prom_scratch;
2124                 memset(path, 0, PROM_SCRATCH_SIZE);
2125 
2126                 /*
2127                  * leave some room at the end of the path for appending extra
2128                  * arguments
2129                  */
2130                 if (call_prom("package-to-path", 3, 1, node, path,
2131                               PROM_SCRATCH_SIZE-10) == PROM_ERROR)
2132                         continue;
2133                 prom_printf("found display   : %s, opening... ", path);
2134                 
2135                 ih = call_prom("open", 1, 1, path);
2136                 if (ih == 0) {
2137                         prom_printf("failed\n");
2138                         continue;
2139                 }
2140 
2141                 /* Success */
2142                 prom_printf("done\n");
2143                 prom_setprop(node, path, "linux,opened", NULL, 0);
2144 
2145                 /* Setup a usable color table when the appropriate
2146                  * method is available. Should update this to set-colors */
2147                 clut = default_colors;
2148                 for (i = 0; i < 16; i++, clut += 3)
2149                         if (prom_set_color(ih, i, clut[0], clut[1],
2150                                            clut[2]) != 0)
2151                                 break;
2152 
2153 #ifdef CONFIG_LOGO_LINUX_CLUT224
2154                 clut = PTRRELOC(logo_linux_clut224.clut);
2155                 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2156                         if (prom_set_color(ih, i + 32, clut[0], clut[1],
2157                                            clut[2]) != 0)
2158                                 break;
2159 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2160 
2161 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
2162                 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
2163                     PROM_ERROR) {
2164                         u32 width, height, pitch, addr;
2165 
2166                         prom_printf("Setting btext !\n");
2167                         prom_getprop(node, "width", &width, 4);
2168                         prom_getprop(node, "height", &height, 4);
2169                         prom_getprop(node, "linebytes", &pitch, 4);
2170                         prom_getprop(node, "address", &addr, 4);
2171                         prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2172                                     width, height, pitch, addr);
2173                         btext_setup_display(width, height, 8, pitch, addr);
2174                 }
2175 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2176         }
2177 }
2178 
2179 
2180 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2181 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2182                               unsigned long needed, unsigned long align)
2183 {
2184         void *ret;
2185 
2186         *mem_start = _ALIGN(*mem_start, align);
2187         while ((*mem_start + needed) > *mem_end) {
2188                 unsigned long room, chunk;
2189 
2190                 prom_debug("Chunk exhausted, claiming more at %x...\n",
2191                            alloc_bottom);
2192                 room = alloc_top - alloc_bottom;
2193                 if (room > DEVTREE_CHUNK_SIZE)
2194                         room = DEVTREE_CHUNK_SIZE;
2195                 if (room < PAGE_SIZE)
2196                         prom_panic("No memory for flatten_device_tree "
2197                                    "(no room)\n");
2198                 chunk = alloc_up(room, 0);
2199                 if (chunk == 0)
2200                         prom_panic("No memory for flatten_device_tree "
2201                                    "(claim failed)\n");
2202                 *mem_end = chunk + room;
2203         }
2204 
2205         ret = (void *)*mem_start;
2206         *mem_start += needed;
2207 
2208         return ret;
2209 }
2210 
2211 #define dt_push_token(token, mem_start, mem_end) do {                   \
2212                 void *room = make_room(mem_start, mem_end, 4, 4);       \
2213                 *(__be32 *)room = cpu_to_be32(token);                   \
2214         } while(0)
2215 
2216 static unsigned long __init dt_find_string(char *str)
2217 {
2218         char *s, *os;
2219 
2220         s = os = (char *)dt_string_start;
2221         s += 4;
2222         while (s <  (char *)dt_string_end) {
2223                 if (strcmp(s, str) == 0)
2224                         return s - os;
2225                 s += strlen(s) + 1;
2226         }
2227         return 0;
2228 }
2229 
2230 /*
2231  * The Open Firmware 1275 specification states properties must be 31 bytes or
2232  * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2233  */
2234 #define MAX_PROPERTY_NAME 64
2235 
2236 static void __init scan_dt_build_strings(phandle node,
2237                                          unsigned long *mem_start,
2238                                          unsigned long *mem_end)
2239 {
2240         char *prev_name, *namep, *sstart;
2241         unsigned long soff;
2242         phandle child;
2243 
2244         sstart =  (char *)dt_string_start;
2245 
2246         /* get and store all property names */
2247         prev_name = "";
2248         for (;;) {
2249                 /* 64 is max len of name including nul. */
2250                 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2251                 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2252                         /* No more nodes: unwind alloc */
2253                         *mem_start = (unsigned long)namep;
2254                         break;
2255                 }
2256 
2257                 /* skip "name" */
2258                 if (strcmp(namep, "name") == 0) {
2259                         *mem_start = (unsigned long)namep;
2260                         prev_name = "name";
2261                         continue;
2262                 }
2263                 /* get/create string entry */
2264                 soff = dt_find_string(namep);
2265                 if (soff != 0) {
2266                         *mem_start = (unsigned long)namep;
2267                         namep = sstart + soff;
2268                 } else {
2269                         /* Trim off some if we can */
2270                         *mem_start = (unsigned long)namep + strlen(namep) + 1;
2271                         dt_string_end = *mem_start;
2272                 }
2273                 prev_name = namep;
2274         }
2275 
2276         /* do all our children */
2277         child = call_prom("child", 1, 1, node);
2278         while (child != 0) {
2279                 scan_dt_build_strings(child, mem_start, mem_end);
2280                 child = call_prom("peer", 1, 1, child);
2281         }
2282 }
2283 
2284 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2285                                         unsigned long *mem_end)
2286 {
2287         phandle child;
2288         char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2289         unsigned long soff;
2290         unsigned char *valp;
2291         static char pname[MAX_PROPERTY_NAME];
2292         int l, room, has_phandle = 0;
2293 
2294         dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2295 
2296         /* get the node's full name */
2297         namep = (char *)*mem_start;
2298         room = *mem_end - *mem_start;
2299         if (room > 255)
2300                 room = 255;
2301         l = call_prom("package-to-path", 3, 1, node, namep, room);
2302         if (l >= 0) {
2303                 /* Didn't fit?  Get more room. */
2304                 if (l >= room) {
2305                         if (l >= *mem_end - *mem_start)
2306                                 namep = make_room(mem_start, mem_end, l+1, 1);
2307                         call_prom("package-to-path", 3, 1, node, namep, l);
2308                 }
2309                 namep[l] = '\0';
2310 
2311                 /* Fixup an Apple bug where they have bogus \0 chars in the
2312                  * middle of the path in some properties, and extract
2313                  * the unit name (everything after the last '/').
2314                  */
2315                 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2316                         if (*p == '/')
2317                                 lp = namep;
2318                         else if (*p != 0)
2319                                 *lp++ = *p;
2320                 }
2321                 *lp = 0;
2322                 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2323         }
2324 
2325         /* get it again for debugging */
2326         path = prom_scratch;
2327         memset(path, 0, PROM_SCRATCH_SIZE);
2328         call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2329 
2330         /* get and store all properties */
2331         prev_name = "";
2332         sstart = (char *)dt_string_start;
2333         for (;;) {
2334                 if (call_prom("nextprop", 3, 1, node, prev_name,
2335                               pname) != 1)
2336                         break;
2337 
2338                 /* skip "name" */
2339                 if (strcmp(pname, "name") == 0) {
2340                         prev_name = "name";
2341                         continue;
2342                 }
2343 
2344                 /* find string offset */
2345                 soff = dt_find_string(pname);
2346                 if (soff == 0) {
2347                         prom_printf("WARNING: Can't find string index for"
2348                                     " <%s>, node %s\n", pname, path);
2349                         break;
2350                 }
2351                 prev_name = sstart + soff;
2352 
2353                 /* get length */
2354                 l = call_prom("getproplen", 2, 1, node, pname);
2355 
2356                 /* sanity checks */
2357                 if (l == PROM_ERROR)
2358                         continue;
2359 
2360                 /* push property head */
2361                 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2362                 dt_push_token(l, mem_start, mem_end);
2363                 dt_push_token(soff, mem_start, mem_end);
2364 
2365                 /* push property content */
2366                 valp = make_room(mem_start, mem_end, l, 4);
2367                 call_prom("getprop", 4, 1, node, pname, valp, l);
2368                 *mem_start = _ALIGN(*mem_start, 4);
2369 
2370                 if (!strcmp(pname, "phandle"))
2371                         has_phandle = 1;
2372         }
2373 
2374         /* Add a "linux,phandle" property if no "phandle" property already
2375          * existed (can happen with OPAL)
2376          */
2377         if (!has_phandle) {
2378                 soff = dt_find_string("linux,phandle");
2379                 if (soff == 0)
2380                         prom_printf("WARNING: Can't find string index for"
2381                                     " <linux-phandle> node %s\n", path);
2382                 else {
2383                         dt_push_token(OF_DT_PROP, mem_start, mem_end);
2384                         dt_push_token(4, mem_start, mem_end);
2385                         dt_push_token(soff, mem_start, mem_end);
2386                         valp = make_room(mem_start, mem_end, 4, 4);
2387                         *(__be32 *)valp = cpu_to_be32(node);
2388                 }
2389         }
2390 
2391         /* do all our children */
2392         child = call_prom("child", 1, 1, node);
2393         while (child != 0) {
2394                 scan_dt_build_struct(child, mem_start, mem_end);
2395                 child = call_prom("peer", 1, 1, child);
2396         }
2397 
2398         dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2399 }
2400 
2401 static void __init flatten_device_tree(void)
2402 {
2403         phandle root;
2404         unsigned long mem_start, mem_end, room;
2405         struct boot_param_header *hdr;
2406         char *namep;
2407         u64 *rsvmap;
2408 
2409         /*
2410          * Check how much room we have between alloc top & bottom (+/- a
2411          * few pages), crop to 1MB, as this is our "chunk" size
2412          */
2413         room = alloc_top - alloc_bottom - 0x4000;
2414         if (room > DEVTREE_CHUNK_SIZE)
2415                 room = DEVTREE_CHUNK_SIZE;
2416         prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2417 
2418         /* Now try to claim that */
2419         mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2420         if (mem_start == 0)
2421                 prom_panic("Can't allocate initial device-tree chunk\n");
2422         mem_end = mem_start + room;
2423 
2424         /* Get root of tree */
2425         root = call_prom("peer", 1, 1, (phandle)0);
2426         if (root == (phandle)0)
2427                 prom_panic ("couldn't get device tree root\n");
2428 
2429         /* Build header and make room for mem rsv map */ 
2430         mem_start = _ALIGN(mem_start, 4);
2431         hdr = make_room(&mem_start, &mem_end,
2432                         sizeof(struct boot_param_header), 4);
2433         dt_header_start = (unsigned long)hdr;
2434         rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2435 
2436         /* Start of strings */
2437         mem_start = PAGE_ALIGN(mem_start);
2438         dt_string_start = mem_start;
2439         mem_start += 4; /* hole */
2440 
2441         /* Add "linux,phandle" in there, we'll need it */
2442         namep = make_room(&mem_start, &mem_end, 16, 1);
2443         strcpy(namep, "linux,phandle");
2444         mem_start = (unsigned long)namep + strlen(namep) + 1;
2445 
2446         /* Build string array */
2447         prom_printf("Building dt strings...\n"); 
2448         scan_dt_build_strings(root, &mem_start, &mem_end);
2449         dt_string_end = mem_start;
2450 
2451         /* Build structure */
2452         mem_start = PAGE_ALIGN(mem_start);
2453         dt_struct_start = mem_start;
2454         prom_printf("Building dt structure...\n"); 
2455         scan_dt_build_struct(root, &mem_start, &mem_end);
2456         dt_push_token(OF_DT_END, &mem_start, &mem_end);
2457         dt_struct_end = PAGE_ALIGN(mem_start);
2458 
2459         /* Finish header */
2460         hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2461         hdr->magic = cpu_to_be32(OF_DT_HEADER);
2462         hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2463         hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2464         hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2465         hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2466         hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2467         hdr->version = cpu_to_be32(OF_DT_VERSION);
2468         /* Version 16 is not backward compatible */
2469         hdr->last_comp_version = cpu_to_be32(0x10);
2470 
2471         /* Copy the reserve map in */
2472         memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2473 
2474 #ifdef DEBUG_PROM
2475         {
2476                 int i;
2477                 prom_printf("reserved memory map:\n");
2478                 for (i = 0; i < mem_reserve_cnt; i++)
2479                         prom_printf("  %x - %x\n",
2480                                     be64_to_cpu(mem_reserve_map[i].base),
2481                                     be64_to_cpu(mem_reserve_map[i].size));
2482         }
2483 #endif
2484         /* Bump mem_reserve_cnt to cause further reservations to fail
2485          * since it's too late.
2486          */
2487         mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2488 
2489         prom_printf("Device tree strings 0x%x -> 0x%x\n",
2490                     dt_string_start, dt_string_end);
2491         prom_printf("Device tree struct  0x%x -> 0x%x\n",
2492                     dt_struct_start, dt_struct_end);
2493 }
2494 
2495 #ifdef CONFIG_PPC_MAPLE
2496 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2497  * The values are bad, and it doesn't even have the right number of cells. */
2498 static void __init fixup_device_tree_maple(void)
2499 {
2500         phandle isa;
2501         u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2502         u32 isa_ranges[6];
2503         char *name;
2504 
2505         name = "/ht@0/isa@4";
2506         isa = call_prom("finddevice", 1, 1, ADDR(name));
2507         if (!PHANDLE_VALID(isa)) {
2508                 name = "/ht@0/isa@6";
2509                 isa = call_prom("finddevice", 1, 1, ADDR(name));
2510                 rloc = 0x01003000; /* IO space; PCI device = 6 */
2511         }
2512         if (!PHANDLE_VALID(isa))
2513                 return;
2514 
2515         if (prom_getproplen(isa, "ranges") != 12)
2516                 return;
2517         if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2518                 == PROM_ERROR)
2519                 return;
2520 
2521         if (isa_ranges[0] != 0x1 ||
2522                 isa_ranges[1] != 0xf4000000 ||
2523                 isa_ranges[2] != 0x00010000)
2524                 return;
2525 
2526         prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2527 
2528         isa_ranges[0] = 0x1;
2529         isa_ranges[1] = 0x0;
2530         isa_ranges[2] = rloc;
2531         isa_ranges[3] = 0x0;
2532         isa_ranges[4] = 0x0;
2533         isa_ranges[5] = 0x00010000;
2534         prom_setprop(isa, name, "ranges",
2535                         isa_ranges, sizeof(isa_ranges));
2536 }
2537 
2538 #define CPC925_MC_START         0xf8000000
2539 #define CPC925_MC_LENGTH        0x1000000
2540 /* The values for memory-controller don't have right number of cells */
2541 static void __init fixup_device_tree_maple_memory_controller(void)
2542 {
2543         phandle mc;
2544         u32 mc_reg[4];
2545         char *name = "/hostbridge@f8000000";
2546         u32 ac, sc;
2547 
2548         mc = call_prom("finddevice", 1, 1, ADDR(name));
2549         if (!PHANDLE_VALID(mc))
2550                 return;
2551 
2552         if (prom_getproplen(mc, "reg") != 8)
2553                 return;
2554 
2555         prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2556         prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2557         if ((ac != 2) || (sc != 2))
2558                 return;
2559 
2560         if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2561                 return;
2562 
2563         if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2564                 return;
2565 
2566         prom_printf("Fixing up bogus hostbridge on Maple...\n");
2567 
2568         mc_reg[0] = 0x0;
2569         mc_reg[1] = CPC925_MC_START;
2570         mc_reg[2] = 0x0;
2571         mc_reg[3] = CPC925_MC_LENGTH;
2572         prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2573 }
2574 #else
2575 #define fixup_device_tree_maple()
2576 #define fixup_device_tree_maple_memory_controller()
2577 #endif
2578 
2579 #ifdef CONFIG_PPC_CHRP
2580 /*
2581  * Pegasos and BriQ lacks the "ranges" property in the isa node
2582  * Pegasos needs decimal IRQ 14/15, not hexadecimal
2583  * Pegasos has the IDE configured in legacy mode, but advertised as native
2584  */
2585 static void __init fixup_device_tree_chrp(void)
2586 {
2587         phandle ph;
2588         u32 prop[6];
2589         u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2590         char *name;
2591         int rc;
2592 
2593         name = "/pci@80000000/isa@c";
2594         ph = call_prom("finddevice", 1, 1, ADDR(name));
2595         if (!PHANDLE_VALID(ph)) {
2596                 name = "/pci@ff500000/isa@6";
2597                 ph = call_prom("finddevice", 1, 1, ADDR(name));
2598                 rloc = 0x01003000; /* IO space; PCI device = 6 */
2599         }
2600         if (PHANDLE_VALID(ph)) {
2601                 rc = prom_getproplen(ph, "ranges");
2602                 if (rc == 0 || rc == PROM_ERROR) {
2603                         prom_printf("Fixing up missing ISA range on Pegasos...\n");
2604 
2605                         prop[0] = 0x1;
2606                         prop[1] = 0x0;
2607                         prop[2] = rloc;
2608                         prop[3] = 0x0;
2609                         prop[4] = 0x0;
2610                         prop[5] = 0x00010000;
2611                         prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2612                 }
2613         }
2614 
2615         name = "/pci@80000000/ide@C,1";
2616         ph = call_prom("finddevice", 1, 1, ADDR(name));
2617         if (PHANDLE_VALID(ph)) {
2618                 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2619                 prop[0] = 14;
2620                 prop[1] = 0x0;
2621                 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2622                 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2623                 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2624                 if (rc == sizeof(u32)) {
2625                         prop[0] &= ~0x5;
2626                         prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2627                 }
2628         }
2629 }
2630 #else
2631 #define fixup_device_tree_chrp()
2632 #endif
2633 
2634 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2635 static void __init fixup_device_tree_pmac(void)
2636 {
2637         phandle u3, i2c, mpic;
2638         u32 u3_rev;
2639         u32 interrupts[2];
2640         u32 parent;
2641 
2642         /* Some G5s have a missing interrupt definition, fix it up here */
2643         u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2644         if (!PHANDLE_VALID(u3))
2645                 return;
2646         i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2647         if (!PHANDLE_VALID(i2c))
2648                 return;
2649         mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2650         if (!PHANDLE_VALID(mpic))
2651                 return;
2652 
2653         /* check if proper rev of u3 */
2654         if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2655             == PROM_ERROR)
2656                 return;
2657         if (u3_rev < 0x35 || u3_rev > 0x39)
2658                 return;
2659         /* does it need fixup ? */
2660         if (prom_getproplen(i2c, "interrupts") > 0)
2661                 return;
2662 
2663         prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2664 
2665         /* interrupt on this revision of u3 is number 0 and level */
2666         interrupts[0] = 0;
2667         interrupts[1] = 1;
2668         prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2669                      &interrupts, sizeof(interrupts));
2670         parent = (u32)mpic;
2671         prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2672                      &parent, sizeof(parent));
2673 }
2674 #else
2675 #define fixup_device_tree_pmac()
2676 #endif
2677 
2678 #ifdef CONFIG_PPC_EFIKA
2679 /*
2680  * The MPC5200 FEC driver requires an phy-handle property to tell it how
2681  * to talk to the phy.  If the phy-handle property is missing, then this
2682  * function is called to add the appropriate nodes and link it to the
2683  * ethernet node.
2684  */
2685 static void __init fixup_device_tree_efika_add_phy(void)
2686 {
2687         u32 node;
2688         char prop[64];
2689         int rv;
2690 
2691         /* Check if /builtin/ethernet exists - bail if it doesn't */
2692         node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2693         if (!PHANDLE_VALID(node))
2694                 return;
2695 
2696         /* Check if the phy-handle property exists - bail if it does */
2697         rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2698         if (!rv)
2699                 return;
2700 
2701         /*
2702          * At this point the ethernet device doesn't have a phy described.
2703          * Now we need to add the missing phy node and linkage
2704          */
2705 
2706         /* Check for an MDIO bus node - if missing then create one */
2707         node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2708         if (!PHANDLE_VALID(node)) {
2709                 prom_printf("Adding Ethernet MDIO node\n");
2710                 call_prom("interpret", 1, 1,
2711                         " s\" /builtin\" find-device"
2712                         " new-device"
2713                                 " 1 encode-int s\" #address-cells\" property"
2714                                 " 0 encode-int s\" #size-cells\" property"
2715                                 " s\" mdio\" device-name"
2716                                 " s\" fsl,mpc5200b-mdio\" encode-string"
2717                                 " s\" compatible\" property"
2718                                 " 0xf0003000 0x400 reg"
2719                                 " 0x2 encode-int"
2720                                 " 0x5 encode-int encode+"
2721                                 " 0x3 encode-int encode+"
2722                                 " s\" interrupts\" property"
2723                         " finish-device");
2724         };
2725 
2726         /* Check for a PHY device node - if missing then create one and
2727          * give it's phandle to the ethernet node */
2728         node = call_prom("finddevice", 1, 1,
2729                          ADDR("/builtin/mdio/ethernet-phy"));
2730         if (!PHANDLE_VALID(node)) {
2731                 prom_printf("Adding Ethernet PHY node\n");
2732                 call_prom("interpret", 1, 1,
2733                         " s\" /builtin/mdio\" find-device"
2734                         " new-device"
2735                                 " s\" ethernet-phy\" device-name"
2736                                 " 0x10 encode-int s\" reg\" property"
2737                                 " my-self"
2738                                 " ihandle>phandle"
2739                         " finish-device"
2740                         " s\" /builtin/ethernet\" find-device"
2741                                 " encode-int"
2742                                 " s\" phy-handle\" property"
2743                         " device-end");
2744         }
2745 }
2746 
2747 static void __init fixup_device_tree_efika(void)
2748 {
2749         int sound_irq[3] = { 2, 2, 0 };
2750         int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2751                                 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2752                                 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2753                                 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2754         u32 node;
2755         char prop[64];
2756         int rv, len;
2757 
2758         /* Check if we're really running on a EFIKA */
2759         node = call_prom("finddevice", 1, 1, ADDR("/"));
2760         if (!PHANDLE_VALID(node))
2761                 return;
2762 
2763         rv = prom_getprop(node, "model", prop, sizeof(prop));
2764         if (rv == PROM_ERROR)
2765                 return;
2766         if (strcmp(prop, "EFIKA5K2"))
2767                 return;
2768 
2769         prom_printf("Applying EFIKA device tree fixups\n");
2770 
2771         /* Claiming to be 'chrp' is death */
2772         node = call_prom("finddevice", 1, 1, ADDR("/"));
2773         rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2774         if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2775                 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2776 
2777         /* CODEGEN,description is exposed in /proc/cpuinfo so
2778            fix that too */
2779         rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2780         if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2781                 prom_setprop(node, "/", "CODEGEN,description",
2782                              "Efika 5200B PowerPC System",
2783                              sizeof("Efika 5200B PowerPC System"));
2784 
2785         /* Fixup bestcomm interrupts property */
2786         node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2787         if (PHANDLE_VALID(node)) {
2788                 len = prom_getproplen(node, "interrupts");
2789                 if (len == 12) {
2790                         prom_printf("Fixing bestcomm interrupts property\n");
2791                         prom_setprop(node, "/builtin/bestcom", "interrupts",
2792                                      bcomm_irq, sizeof(bcomm_irq));
2793                 }
2794         }
2795 
2796         /* Fixup sound interrupts property */
2797         node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2798         if (PHANDLE_VALID(node)) {
2799                 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2800                 if (rv == PROM_ERROR) {
2801                         prom_printf("Adding sound interrupts property\n");
2802                         prom_setprop(node, "/builtin/sound", "interrupts",
2803                                      sound_irq, sizeof(sound_irq));
2804                 }
2805         }
2806 
2807         /* Make sure ethernet phy-handle property exists */
2808         fixup_device_tree_efika_add_phy();
2809 }
2810 #else
2811 #define fixup_device_tree_efika()
2812 #endif
2813 
2814 static void __init fixup_device_tree(void)
2815 {
2816         fixup_device_tree_maple();
2817         fixup_device_tree_maple_memory_controller();
2818         fixup_device_tree_chrp();
2819         fixup_device_tree_pmac();
2820         fixup_device_tree_efika();
2821 }
2822 
2823 static void __init prom_find_boot_cpu(void)
2824 {
2825         __be32 rval;
2826         ihandle prom_cpu;
2827         phandle cpu_pkg;
2828 
2829         rval = 0;
2830         if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
2831                 return;
2832         prom_cpu = be32_to_cpu(rval);
2833 
2834         cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2835 
2836         prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
2837         prom.cpu = be32_to_cpu(rval);
2838 
2839         prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
2840 }
2841 
2842 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2843 {
2844 #ifdef CONFIG_BLK_DEV_INITRD
2845         if (r3 && r4 && r4 != 0xdeadbeef) {
2846                 __be64 val;
2847 
2848                 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
2849                 prom_initrd_end = prom_initrd_start + r4;
2850 
2851                 val = cpu_to_be64(prom_initrd_start);
2852                 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
2853                              &val, sizeof(val));
2854                 val = cpu_to_be64(prom_initrd_end);
2855                 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
2856                              &val, sizeof(val));
2857 
2858                 reserve_mem(prom_initrd_start,
2859                             prom_initrd_end - prom_initrd_start);
2860 
2861                 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
2862                 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
2863         }
2864 #endif /* CONFIG_BLK_DEV_INITRD */
2865 }
2866 
2867 #ifdef CONFIG_PPC64
2868 #ifdef CONFIG_RELOCATABLE
2869 static void reloc_toc(void)
2870 {
2871 }
2872 
2873 static void unreloc_toc(void)
2874 {
2875 }
2876 #else
2877 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
2878 {
2879         unsigned long i;
2880         unsigned long *toc_entry;
2881 
2882         /* Get the start of the TOC by using r2 directly. */
2883         asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
2884 
2885         for (i = 0; i < nr_entries; i++) {
2886                 *toc_entry = *toc_entry + offset;
2887                 toc_entry++;
2888         }
2889 }
2890 
2891 static void reloc_toc(void)
2892 {
2893         unsigned long offset = reloc_offset();
2894         unsigned long nr_entries =
2895                 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2896 
2897         __reloc_toc(offset, nr_entries);
2898 
2899         mb();
2900 }
2901 
2902 static void unreloc_toc(void)
2903 {
2904         unsigned long offset = reloc_offset();
2905         unsigned long nr_entries =
2906                 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2907 
2908         mb();
2909 
2910         __reloc_toc(-offset, nr_entries);
2911 }
2912 #endif
2913 #endif
2914 
2915 /*
2916  * We enter here early on, when the Open Firmware prom is still
2917  * handling exceptions and the MMU hash table for us.
2918  */
2919 
2920 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2921                                unsigned long pp,
2922                                unsigned long r6, unsigned long r7,
2923                                unsigned long kbase)
2924 {       
2925         unsigned long hdr;
2926 
2927 #ifdef CONFIG_PPC32
2928         unsigned long offset = reloc_offset();
2929         reloc_got2(offset);
2930 #else
2931         reloc_toc();
2932 #endif
2933 
2934         /*
2935          * First zero the BSS
2936          */
2937         memset(&__bss_start, 0, __bss_stop - __bss_start);
2938 
2939         /*
2940          * Init interface to Open Firmware, get some node references,
2941          * like /chosen
2942          */
2943         prom_init_client_services(pp);
2944 
2945         /*
2946          * See if this OF is old enough that we need to do explicit maps
2947          * and other workarounds
2948          */
2949         prom_find_mmu();
2950 
2951         /*
2952          * Init prom stdout device
2953          */
2954         prom_init_stdout();
2955 
2956         prom_printf("Preparing to boot %s", linux_banner);
2957 
2958         /*
2959          * Get default machine type. At this point, we do not differentiate
2960          * between pSeries SMP and pSeries LPAR
2961          */
2962         of_platform = prom_find_machine_type();
2963         prom_printf("Detected machine type: %x\n", of_platform);
2964 
2965 #ifndef CONFIG_NONSTATIC_KERNEL
2966         /* Bail if this is a kdump kernel. */
2967         if (PHYSICAL_START > 0)
2968                 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2969 #endif
2970 
2971         /*
2972          * Check for an initrd
2973          */
2974         prom_check_initrd(r3, r4);
2975 
2976 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2977         /*
2978          * On pSeries, inform the firmware about our capabilities
2979          */
2980         if (of_platform == PLATFORM_PSERIES ||
2981             of_platform == PLATFORM_PSERIES_LPAR)
2982                 prom_send_capabilities();
2983 #endif
2984 
2985         /*
2986          * Copy the CPU hold code
2987          */
2988         if (of_platform != PLATFORM_POWERMAC)
2989                 copy_and_flush(0, kbase, 0x100, 0);
2990 
2991         /*
2992          * Do early parsing of command line
2993          */
2994         early_cmdline_parse();
2995 
2996         /*
2997          * Initialize memory management within prom_init
2998          */
2999         prom_init_mem();
3000 
3001         /*
3002          * Determine which cpu is actually running right _now_
3003          */
3004         prom_find_boot_cpu();
3005 
3006         /* 
3007          * Initialize display devices
3008          */
3009         prom_check_displays();
3010 
3011 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
3012         /*
3013          * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
3014          * that uses the allocator, we need to make sure we get the top of memory
3015          * available for us here...
3016          */
3017         if (of_platform == PLATFORM_PSERIES)
3018                 prom_initialize_tce_table();
3019 #endif
3020 
3021         /*
3022          * On non-powermacs, try to instantiate RTAS. PowerMacs don't
3023          * have a usable RTAS implementation.
3024          */
3025         if (of_platform != PLATFORM_POWERMAC &&
3026             of_platform != PLATFORM_OPAL)
3027                 prom_instantiate_rtas();
3028 
3029 #ifdef CONFIG_PPC_POWERNV
3030 #ifdef __BIG_ENDIAN__
3031         /* Detect HAL and try instanciating it & doing takeover */
3032         if (of_platform == PLATFORM_PSERIES_LPAR) {
3033                 prom_query_opal();
3034                 if (of_platform == PLATFORM_OPAL) {
3035                         prom_opal_hold_cpus();
3036                         prom_opal_takeover();
3037                 }
3038         } else
3039 #endif /* __BIG_ENDIAN__ */
3040         if (of_platform == PLATFORM_OPAL)
3041                 prom_instantiate_opal();
3042 #endif /* CONFIG_PPC_POWERNV */
3043 
3044 #ifdef CONFIG_PPC64
3045         /* instantiate sml */
3046         prom_instantiate_sml();
3047 #endif
3048 
3049         /*
3050          * On non-powermacs, put all CPUs in spin-loops.
3051          *
3052          * PowerMacs use a different mechanism to spin CPUs
3053          *
3054          * (This must be done after instanciating RTAS)
3055          */
3056         if (of_platform != PLATFORM_POWERMAC &&
3057             of_platform != PLATFORM_OPAL)
3058                 prom_hold_cpus();
3059 
3060         /*
3061          * Fill in some infos for use by the kernel later on
3062          */
3063         if (prom_memory_limit) {
3064                 __be64 val = cpu_to_be64(prom_memory_limit);
3065                 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
3066                              &val, sizeof(val));
3067         }
3068 #ifdef CONFIG_PPC64
3069         if (prom_iommu_off)
3070                 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
3071                              NULL, 0);
3072 
3073         if (prom_iommu_force_on)
3074                 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
3075                              NULL, 0);
3076 
3077         if (prom_tce_alloc_start) {
3078                 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
3079                              &prom_tce_alloc_start,
3080                              sizeof(prom_tce_alloc_start));
3081                 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
3082                              &prom_tce_alloc_end,
3083                              sizeof(prom_tce_alloc_end));
3084         }
3085 #endif
3086 
3087         /*
3088          * Fixup any known bugs in the device-tree
3089          */
3090         fixup_device_tree();
3091 
3092         /*
3093          * Now finally create the flattened device-tree
3094          */
3095         prom_printf("copying OF device tree...\n");
3096         flatten_device_tree();
3097 
3098         /*
3099          * in case stdin is USB and still active on IBM machines...
3100          * Unfortunately quiesce crashes on some powermacs if we have
3101          * closed stdin already (in particular the powerbook 101). It
3102          * appears that the OPAL version of OFW doesn't like it either.
3103          */
3104         if (of_platform != PLATFORM_POWERMAC &&
3105             of_platform != PLATFORM_OPAL)
3106                 prom_close_stdin();
3107 
3108         /*
3109          * Call OF "quiesce" method to shut down pending DMA's from
3110          * devices etc...
3111          */
3112         prom_printf("Calling quiesce...\n");
3113         call_prom("quiesce", 0, 0);
3114 
3115         /*
3116          * And finally, call the kernel passing it the flattened device
3117          * tree and NULL as r5, thus triggering the new entry point which
3118          * is common to us and kexec
3119          */
3120         hdr = dt_header_start;
3121 
3122         /* Don't print anything after quiesce under OPAL, it crashes OFW */
3123         if (of_platform != PLATFORM_OPAL) {
3124                 prom_printf("returning from prom_init\n");
3125                 prom_debug("->dt_header_start=0x%x\n", hdr);
3126         }
3127 
3128 #ifdef CONFIG_PPC32
3129         reloc_got2(-offset);
3130 #else
3131         unreloc_toc();
3132 #endif
3133 
3134 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
3135         /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
3136         __start(hdr, kbase, 0, 0, 0,
3137                 prom_opal_base, prom_opal_entry);
3138 #else
3139         __start(hdr, kbase, 0, 0, 0, 0, 0);
3140 #endif
3141 
3142         return 0;
3143 }
3144 

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