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TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/powermac/bootx_init.c

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  1 /*
  2  *  Early boot support code for BootX bootloader
  3  *
  4  *  Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
  5  *
  6  *  This program is free software; you can redistribute it and/or
  7  *  modify it under the terms of the GNU General Public License
  8  *  as published by the Free Software Foundation; either version
  9  *  2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/string.h>
 14 #include <linux/init.h>
 15 #include <generated/utsrelease.h>
 16 #include <asm/sections.h>
 17 #include <asm/prom.h>
 18 #include <asm/page.h>
 19 #include <asm/bootx.h>
 20 #include <asm/btext.h>
 21 #include <asm/io.h>
 22 #include <asm/setup.h>
 23 
 24 #undef DEBUG
 25 #define SET_BOOT_BAT
 26 
 27 #ifdef DEBUG
 28 #define DBG(fmt...) do { bootx_printf(fmt); } while(0)
 29 #else
 30 #define DBG(fmt...) do { } while(0)
 31 #endif
 32 
 33 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
 34 
 35 static unsigned long __initdata bootx_dt_strbase;
 36 static unsigned long __initdata bootx_dt_strend;
 37 static unsigned long __initdata bootx_node_chosen;
 38 static boot_infos_t * __initdata bootx_info;
 39 static char __initdata bootx_disp_path[256];
 40 
 41 /* Is boot-info compatible ? */
 42 #define BOOT_INFO_IS_COMPATIBLE(bi) \
 43         ((bi)->compatible_version <= BOOT_INFO_VERSION)
 44 #define BOOT_INFO_IS_V2_COMPATIBLE(bi)  ((bi)->version >= 2)
 45 #define BOOT_INFO_IS_V4_COMPATIBLE(bi)  ((bi)->version >= 4)
 46 
 47 #ifdef CONFIG_BOOTX_TEXT
 48 static void __init bootx_printf(const char *format, ...)
 49 {
 50         const char *p, *q, *s;
 51         va_list args;
 52         unsigned long v;
 53 
 54         va_start(args, format);
 55         for (p = format; *p != 0; p = q) {
 56                 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
 57                         ;
 58                 if (q > p)
 59                         btext_drawtext(p, q - p);
 60                 if (*q == 0)
 61                         break;
 62                 if (*q == '\n') {
 63                         ++q;
 64                         btext_flushline();
 65                         btext_drawstring("\r\n");
 66                         btext_flushline();
 67                         continue;
 68                 }
 69                 ++q;
 70                 if (*q == 0)
 71                         break;
 72                 switch (*q) {
 73                 case 's':
 74                         ++q;
 75                         s = va_arg(args, const char *);
 76                         if (s == NULL)
 77                                 s = "<NULL>";
 78                         btext_drawstring(s);
 79                         break;
 80                 case 'x':
 81                         ++q;
 82                         v = va_arg(args, unsigned long);
 83                         btext_drawhex(v);
 84                         break;
 85                 }
 86         }
 87 }
 88 #else /* CONFIG_BOOTX_TEXT */
 89 static void __init bootx_printf(const char *format, ...) {}
 90 #endif /* CONFIG_BOOTX_TEXT */
 91 
 92 static void * __init bootx_early_getprop(unsigned long base,
 93                                          unsigned long node,
 94                                          char *prop)
 95 {
 96         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
 97         u32 *ppp = &np->properties;
 98 
 99         while(*ppp) {
100                 struct bootx_dt_prop *pp =
101                         (struct bootx_dt_prop *)(base + *ppp);
102 
103                 if (strcmp((char *)((unsigned long)pp->name + base),
104                            prop) == 0) {
105                         return (void *)((unsigned long)pp->value + base);
106                 }
107                 ppp = &pp->next;
108         }
109         return NULL;
110 }
111 
112 #define dt_push_token(token, mem) \
113         do { \
114                 *(mem) = _ALIGN_UP(*(mem),4); \
115                 *((u32 *)*(mem)) = token; \
116                 *(mem) += 4; \
117         } while(0)
118 
119 static unsigned long __init bootx_dt_find_string(char *str)
120 {
121         char *s, *os;
122 
123         s = os = (char *)bootx_dt_strbase;
124         s += 4;
125         while (s <  (char *)bootx_dt_strend) {
126                 if (strcmp(s, str) == 0)
127                         return s - os;
128                 s += strlen(s) + 1;
129         }
130         return 0;
131 }
132 
133 static void __init bootx_dt_add_prop(char *name, void *data, int size,
134                                   unsigned long *mem_end)
135 {
136         unsigned long soff = bootx_dt_find_string(name);
137         if (data == NULL)
138                 size = 0;
139         if (soff == 0) {
140                 bootx_printf("WARNING: Can't find string index for <%s>\n",
141                              name);
142                 return;
143         }
144         if (size > 0x20000) {
145                 bootx_printf("WARNING: ignoring large property ");
146                 bootx_printf("%s length 0x%x\n", name, size);
147                 return;
148         }
149         dt_push_token(OF_DT_PROP, mem_end);
150         dt_push_token(size, mem_end);
151         dt_push_token(soff, mem_end);
152 
153         /* push property content */
154         if (size && data) {
155                 memcpy((void *)*mem_end, data, size);
156                 *mem_end = _ALIGN_UP(*mem_end + size, 4);
157         }
158 }
159 
160 static void __init bootx_add_chosen_props(unsigned long base,
161                                           unsigned long *mem_end)
162 {
163         u32 val;
164 
165         bootx_dt_add_prop("linux,bootx", NULL, 0, mem_end);
166 
167         if (bootx_info->kernelParamsOffset) {
168                 char *args = (char *)((unsigned long)bootx_info) +
169                         bootx_info->kernelParamsOffset;
170                 bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end);
171         }
172         if (bootx_info->ramDisk) {
173                 val = ((unsigned long)bootx_info) + bootx_info->ramDisk;
174                 bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end);
175                 val += bootx_info->ramDiskSize;
176                 bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end);
177         }
178         if (strlen(bootx_disp_path))
179                 bootx_dt_add_prop("linux,stdout-path", bootx_disp_path,
180                                   strlen(bootx_disp_path) + 1, mem_end);
181 }
182 
183 static void __init bootx_add_display_props(unsigned long base,
184                                            unsigned long *mem_end,
185                                            int has_real_node)
186 {
187         boot_infos_t *bi = bootx_info;
188         u32 tmp;
189 
190         if (has_real_node) {
191                 bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
192                 bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
193         } else
194                 bootx_dt_add_prop("linux,bootx-noscreen", NULL, 0, mem_end);
195 
196         tmp = bi->dispDeviceDepth;
197         bootx_dt_add_prop("linux,bootx-depth", &tmp, 4, mem_end);
198         tmp = bi->dispDeviceRect[2] - bi->dispDeviceRect[0];
199         bootx_dt_add_prop("linux,bootx-width", &tmp, 4, mem_end);
200         tmp = bi->dispDeviceRect[3] - bi->dispDeviceRect[1];
201         bootx_dt_add_prop("linux,bootx-height", &tmp, 4, mem_end);
202         tmp = bi->dispDeviceRowBytes;
203         bootx_dt_add_prop("linux,bootx-linebytes", &tmp, 4, mem_end);
204         tmp = (u32)bi->dispDeviceBase;
205         if (tmp == 0)
206                 tmp = (u32)bi->logicalDisplayBase;
207         tmp += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
208         tmp += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
209         bootx_dt_add_prop("linux,bootx-addr", &tmp, 4, mem_end);
210 }
211 
212 static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
213 {
214         unsigned int l = strlen(s) + 1;
215         memcpy((void *)*mem_end, s, l);
216         bootx_dt_strend = *mem_end = *mem_end + l;
217 }
218 
219 static void __init bootx_scan_dt_build_strings(unsigned long base,
220                                                unsigned long node,
221                                                unsigned long *mem_end)
222 {
223         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
224         u32 *cpp, *ppp = &np->properties;
225         unsigned long soff;
226         char *namep;
227 
228         /* Keep refs to known nodes */
229         namep = np->full_name ? (char *)(base + np->full_name) : NULL;
230         if (namep == NULL) {
231                 bootx_printf("Node without a full name !\n");
232                 namep = "";
233         }
234         DBG("* strings: %s\n", namep);
235 
236         if (!strcmp(namep, "/chosen")) {
237                 DBG(" detected /chosen ! adding properties names !\n");
238                 bootx_dt_add_string("linux,bootx", mem_end);
239                 bootx_dt_add_string("linux,stdout-path", mem_end);
240                 bootx_dt_add_string("linux,initrd-start", mem_end);
241                 bootx_dt_add_string("linux,initrd-end", mem_end);
242                 bootx_dt_add_string("bootargs", mem_end);
243                 bootx_node_chosen = node;
244         }
245         if (node == bootx_info->dispDeviceRegEntryOffset) {
246                 DBG(" detected display ! adding properties names !\n");
247                 bootx_dt_add_string("linux,boot-display", mem_end);
248                 bootx_dt_add_string("linux,opened", mem_end);
249                 strncpy(bootx_disp_path, namep, 255);
250         }
251 
252         /* get and store all property names */
253         while (*ppp) {
254                 struct bootx_dt_prop *pp =
255                         (struct bootx_dt_prop *)(base + *ppp);
256 
257                 namep = pp->name ? (char *)(base + pp->name) : NULL;
258                 if (namep == NULL || strcmp(namep, "name") == 0)
259                         goto next;
260                 /* get/create string entry */
261                 soff = bootx_dt_find_string(namep);
262                 if (soff == 0)
263                         bootx_dt_add_string(namep, mem_end);
264         next:
265                 ppp = &pp->next;
266         }
267 
268         /* do all our children */
269         cpp = &np->child;
270         while(*cpp) {
271                 np = (struct bootx_dt_node *)(base + *cpp);
272                 bootx_scan_dt_build_strings(base, *cpp, mem_end);
273                 cpp = &np->sibling;
274         }
275 }
276 
277 static void __init bootx_scan_dt_build_struct(unsigned long base,
278                                               unsigned long node,
279                                               unsigned long *mem_end)
280 {
281         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
282         u32 *cpp, *ppp = &np->properties;
283         char *namep, *p, *ep, *lp;
284         int l;
285 
286         dt_push_token(OF_DT_BEGIN_NODE, mem_end);
287 
288         /* get the node's full name */
289         namep = np->full_name ? (char *)(base + np->full_name) : NULL;
290         if (namep == NULL)
291                 namep = "";
292         l = strlen(namep);
293 
294         DBG("* struct: %s\n", namep);
295 
296         /* Fixup an Apple bug where they have bogus \0 chars in the
297          * middle of the path in some properties, and extract
298          * the unit name (everything after the last '/').
299          */
300         memcpy((void *)*mem_end, namep, l + 1);
301         namep = (char *)*mem_end;
302         for (lp = p = namep, ep = namep + l; p < ep; p++) {
303                 if (*p == '/')
304                         lp = namep;
305                 else if (*p != 0)
306                         *lp++ = *p;
307         }
308         *lp = 0;
309         *mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);
310 
311         /* get and store all properties */
312         while (*ppp) {
313                 struct bootx_dt_prop *pp =
314                         (struct bootx_dt_prop *)(base + *ppp);
315 
316                 namep = pp->name ? (char *)(base + pp->name) : NULL;
317                 /* Skip "name" */
318                 if (namep == NULL || !strcmp(namep, "name"))
319                         goto next;
320                 /* Skip "bootargs" in /chosen too as we replace it */
321                 if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
322                         goto next;
323 
324                 /* push property head */
325                 bootx_dt_add_prop(namep,
326                                   pp->value ? (void *)(base + pp->value): NULL,
327                                   pp->length, mem_end);
328         next:
329                 ppp = &pp->next;
330         }
331 
332         if (node == bootx_node_chosen) {
333                 bootx_add_chosen_props(base, mem_end);
334                 if (bootx_info->dispDeviceRegEntryOffset == 0)
335                         bootx_add_display_props(base, mem_end, 0);
336         }
337         else if (node == bootx_info->dispDeviceRegEntryOffset)
338                 bootx_add_display_props(base, mem_end, 1);
339 
340         /* do all our children */
341         cpp = &np->child;
342         while(*cpp) {
343                 np = (struct bootx_dt_node *)(base + *cpp);
344                 bootx_scan_dt_build_struct(base, *cpp, mem_end);
345                 cpp = &np->sibling;
346         }
347 
348         dt_push_token(OF_DT_END_NODE, mem_end);
349 }
350 
351 static unsigned long __init bootx_flatten_dt(unsigned long start)
352 {
353         boot_infos_t *bi = bootx_info;
354         unsigned long mem_start, mem_end;
355         struct boot_param_header *hdr;
356         unsigned long base;
357         u64 *rsvmap;
358 
359         /* Start using memory after the big blob passed by BootX, get
360          * some space for the header
361          */
362         mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
363         DBG("Boot params header at: %x\n", mem_start);
364         hdr = (struct boot_param_header *)mem_start;
365         mem_end += sizeof(struct boot_param_header);
366         rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
367         hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
368         mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);
369 
370         /* Get base of tree */
371         base = ((unsigned long)bi) + bi->deviceTreeOffset;
372 
373         /* Build string array */
374         DBG("Building string array at: %x\n", mem_end);
375         DBG("Device Tree Base=%x\n", base);
376         bootx_dt_strbase = mem_end;
377         mem_end += 4;
378         bootx_dt_strend = mem_end;
379         bootx_scan_dt_build_strings(base, 4, &mem_end);
380         /* Add some strings */
381         bootx_dt_add_string("linux,bootx-noscreen", &mem_end);
382         bootx_dt_add_string("linux,bootx-depth", &mem_end);
383         bootx_dt_add_string("linux,bootx-width", &mem_end);
384         bootx_dt_add_string("linux,bootx-height", &mem_end);
385         bootx_dt_add_string("linux,bootx-linebytes", &mem_end);
386         bootx_dt_add_string("linux,bootx-addr", &mem_end);
387         /* Wrap up strings */
388         hdr->off_dt_strings = bootx_dt_strbase - mem_start;
389         hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;
390 
391         /* Build structure */
392         mem_end = _ALIGN(mem_end, 16);
393         DBG("Building device tree structure at: %x\n", mem_end);
394         hdr->off_dt_struct = mem_end - mem_start;
395         bootx_scan_dt_build_struct(base, 4, &mem_end);
396         dt_push_token(OF_DT_END, &mem_end);
397 
398         /* Finish header */
399         hdr->boot_cpuid_phys = 0;
400         hdr->magic = OF_DT_HEADER;
401         hdr->totalsize = mem_end - mem_start;
402         hdr->version = OF_DT_VERSION;
403         /* Version 16 is not backward compatible */
404         hdr->last_comp_version = 0x10;
405 
406         /* Reserve the whole thing and copy the reserve map in, we
407          * also bump mem_reserve_cnt to cause further reservations to
408          * fail since it's too late.
409          */
410         mem_end = _ALIGN(mem_end, PAGE_SIZE);
411         DBG("End of boot params: %x\n", mem_end);
412         rsvmap[0] = mem_start;
413         rsvmap[1] = mem_end;
414         if (bootx_info->ramDisk) {
415                 rsvmap[2] = ((unsigned long)bootx_info) + bootx_info->ramDisk;
416                 rsvmap[3] = rsvmap[2] + bootx_info->ramDiskSize;
417                 rsvmap[4] = 0;
418                 rsvmap[5] = 0;
419         } else {
420                 rsvmap[2] = 0;
421                 rsvmap[3] = 0;
422         }
423 
424         return (unsigned long)hdr;
425 }
426 
427 
428 #ifdef CONFIG_BOOTX_TEXT
429 static void __init btext_welcome(boot_infos_t *bi)
430 {
431         unsigned long flags;
432         unsigned long pvr;
433 
434         bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
435         bootx_printf("\nlinked at        : 0x%x", KERNELBASE);
436         bootx_printf("\nframe buffer at  : 0x%x", bi->dispDeviceBase);
437         bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
438         bootx_printf(" (log)");
439         bootx_printf("\nklimit           : 0x%x",(unsigned long)klimit);
440         bootx_printf("\nboot_info at     : 0x%x", bi);
441         __asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
442         bootx_printf("\nMSR              : 0x%x", flags);
443         __asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
444         bootx_printf("\nPVR              : 0x%x", pvr);
445         pvr >>= 16;
446         if (pvr > 1) {
447             __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
448             bootx_printf("\nHID0             : 0x%x", flags);
449         }
450         if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
451             __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
452             bootx_printf("\nICTC             : 0x%x", flags);
453         }
454 #ifdef DEBUG
455         bootx_printf("\n\n");
456         bootx_printf("bi->deviceTreeOffset   : 0x%x\n",
457                      bi->deviceTreeOffset);
458         bootx_printf("bi->deviceTreeSize     : 0x%x\n",
459                      bi->deviceTreeSize);
460 #endif
461         bootx_printf("\n\n");
462 }
463 #endif /* CONFIG_BOOTX_TEXT */
464 
465 void __init bootx_init(unsigned long r3, unsigned long r4)
466 {
467         boot_infos_t *bi = (boot_infos_t *) r4;
468         unsigned long hdr;
469         unsigned long space;
470         unsigned long ptr, x;
471         char *model;
472         unsigned long offset = reloc_offset();
473 
474         reloc_got2(offset);
475 
476         bootx_info = bi;
477 
478         /* We haven't cleared any bss at this point, make sure
479          * what we need is initialized
480          */
481         bootx_dt_strbase = bootx_dt_strend = 0;
482         bootx_node_chosen = 0;
483         bootx_disp_path[0] = 0;
484 
485         if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
486                 bi->logicalDisplayBase = bi->dispDeviceBase;
487 
488         /* Fixup depth 16 -> 15 as that's what MacOS calls 16bpp */
489         if (bi->dispDeviceDepth == 16)
490                 bi->dispDeviceDepth = 15;
491 
492 
493 #ifdef CONFIG_BOOTX_TEXT
494         ptr = (unsigned long)bi->logicalDisplayBase;
495         ptr += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
496         ptr += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
497         btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
498                             bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
499                             bi->dispDeviceDepth, bi->dispDeviceRowBytes,
500                             (unsigned long)bi->logicalDisplayBase);
501         btext_clearscreen();
502         btext_flushscreen();
503 #endif /* CONFIG_BOOTX_TEXT */
504 
505         /*
506          * Test if boot-info is compatible.  Done only in config
507          * CONFIG_BOOTX_TEXT since there is nothing much we can do
508          * with an incompatible version, except display a message
509          * and eventually hang the processor...
510          *
511          * I'll try to keep enough of boot-info compatible in the
512          * future to always allow display of this message;
513          */
514         if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
515                 bootx_printf(" !!! WARNING - Incompatible version"
516                              " of BootX !!!\n\n\n");
517                 for (;;)
518                         ;
519         }
520         if (bi->architecture != BOOT_ARCH_PCI) {
521                 bootx_printf(" !!! WARNING - Usupported machine"
522                              " architecture !\n");
523                 for (;;)
524                         ;
525         }
526 
527 #ifdef CONFIG_BOOTX_TEXT
528         btext_welcome(bi);
529 #endif
530 
531         /* New BootX enters kernel with MMU off, i/os are not allowed
532          * here. This hack will have been done by the boostrap anyway.
533          */
534         if (bi->version < 4) {
535                 /*
536                  * XXX If this is an iMac, turn off the USB controller.
537                  */
538                 model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
539                                                      4, "model");
540                 if (model
541                     && (strcmp(model, "iMac,1") == 0
542                         || strcmp(model, "PowerMac1,1") == 0)) {
543                         bootx_printf("iMac,1 detected, shutting down USB\n");
544                         out_le32((unsigned __iomem *)0x80880008, 1);    /* XXX */
545                 }
546         }
547 
548         /* Get a pointer that points above the device tree, args, ramdisk,
549          * etc... to use for generating the flattened tree
550          */
551         if (bi->version < 5) {
552                 space = bi->deviceTreeOffset + bi->deviceTreeSize;
553                 if (bi->ramDisk >= space)
554                         space = bi->ramDisk + bi->ramDiskSize;
555         } else
556                 space = bi->totalParamsSize;
557 
558         bootx_printf("Total space used by parameters & ramdisk: 0x%x\n", space);
559 
560         /* New BootX will have flushed all TLBs and enters kernel with
561          * MMU switched OFF, so this should not be useful anymore.
562          */
563         if (bi->version < 4) {
564                 bootx_printf("Touching pages...\n");
565 
566                 /*
567                  * Touch each page to make sure the PTEs for them
568                  * are in the hash table - the aim is to try to avoid
569                  * getting DSI exceptions while copying the kernel image.
570                  */
571                 for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
572                      ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
573                         x = *(volatile unsigned long *)ptr;
574         }
575 
576         /* Ok, now we need to generate a flattened device-tree to pass
577          * to the kernel
578          */
579         bootx_printf("Preparing boot params...\n");
580 
581         hdr = bootx_flatten_dt(space);
582 
583 #ifdef CONFIG_BOOTX_TEXT
584 #ifdef SET_BOOT_BAT
585         bootx_printf("Preparing BAT...\n");
586         btext_prepare_BAT();
587 #else
588         btext_unmap();
589 #endif
590 #endif
591 
592         reloc_got2(-offset);
593 
594         __start(hdr, KERNELBASE + offset, 0);
595 }
596 

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