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

Version: ~ [ linux-5.2-rc5 ] ~ [ linux-5.1.12 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.53 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.128 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.182 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.182 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.68 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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         va_end(args);
 88 }
 89 #else /* CONFIG_BOOTX_TEXT */
 90 static void __init bootx_printf(const char *format, ...) {}
 91 #endif /* CONFIG_BOOTX_TEXT */
 92 
 93 static void * __init bootx_early_getprop(unsigned long base,
 94                                          unsigned long node,
 95                                          char *prop)
 96 {
 97         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
 98         u32 *ppp = &np->properties;
 99 
100         while(*ppp) {
101                 struct bootx_dt_prop *pp =
102                         (struct bootx_dt_prop *)(base + *ppp);
103 
104                 if (strcmp((char *)((unsigned long)pp->name + base),
105                            prop) == 0) {
106                         return (void *)((unsigned long)pp->value + base);
107                 }
108                 ppp = &pp->next;
109         }
110         return NULL;
111 }
112 
113 #define dt_push_token(token, mem) \
114         do { \
115                 *(mem) = _ALIGN_UP(*(mem),4); \
116                 *((u32 *)*(mem)) = token; \
117                 *(mem) += 4; \
118         } while(0)
119 
120 static unsigned long __init bootx_dt_find_string(char *str)
121 {
122         char *s, *os;
123 
124         s = os = (char *)bootx_dt_strbase;
125         s += 4;
126         while (s <  (char *)bootx_dt_strend) {
127                 if (strcmp(s, str) == 0)
128                         return s - os;
129                 s += strlen(s) + 1;
130         }
131         return 0;
132 }
133 
134 static void __init bootx_dt_add_prop(char *name, void *data, int size,
135                                   unsigned long *mem_end)
136 {
137         unsigned long soff = bootx_dt_find_string(name);
138         if (data == NULL)
139                 size = 0;
140         if (soff == 0) {
141                 bootx_printf("WARNING: Can't find string index for <%s>\n",
142                              name);
143                 return;
144         }
145         if (size > 0x20000) {
146                 bootx_printf("WARNING: ignoring large property ");
147                 bootx_printf("%s length 0x%x\n", name, size);
148                 return;
149         }
150         dt_push_token(OF_DT_PROP, mem_end);
151         dt_push_token(size, mem_end);
152         dt_push_token(soff, mem_end);
153 
154         /* push property content */
155         if (size && data) {
156                 memcpy((void *)*mem_end, data, size);
157                 *mem_end = _ALIGN_UP(*mem_end + size, 4);
158         }
159 }
160 
161 static void __init bootx_add_chosen_props(unsigned long base,
162                                           unsigned long *mem_end)
163 {
164         u32 val;
165 
166         bootx_dt_add_prop("linux,bootx", NULL, 0, mem_end);
167 
168         if (bootx_info->kernelParamsOffset) {
169                 char *args = (char *)((unsigned long)bootx_info) +
170                         bootx_info->kernelParamsOffset;
171                 bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end);
172         }
173         if (bootx_info->ramDisk) {
174                 val = ((unsigned long)bootx_info) + bootx_info->ramDisk;
175                 bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end);
176                 val += bootx_info->ramDiskSize;
177                 bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end);
178         }
179         if (strlen(bootx_disp_path))
180                 bootx_dt_add_prop("linux,stdout-path", bootx_disp_path,
181                                   strlen(bootx_disp_path) + 1, mem_end);
182 }
183 
184 static void __init bootx_add_display_props(unsigned long base,
185                                            unsigned long *mem_end,
186                                            int has_real_node)
187 {
188         boot_infos_t *bi = bootx_info;
189         u32 tmp;
190 
191         if (has_real_node) {
192                 bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
193                 bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
194         } else
195                 bootx_dt_add_prop("linux,bootx-noscreen", NULL, 0, mem_end);
196 
197         tmp = bi->dispDeviceDepth;
198         bootx_dt_add_prop("linux,bootx-depth", &tmp, 4, mem_end);
199         tmp = bi->dispDeviceRect[2] - bi->dispDeviceRect[0];
200         bootx_dt_add_prop("linux,bootx-width", &tmp, 4, mem_end);
201         tmp = bi->dispDeviceRect[3] - bi->dispDeviceRect[1];
202         bootx_dt_add_prop("linux,bootx-height", &tmp, 4, mem_end);
203         tmp = bi->dispDeviceRowBytes;
204         bootx_dt_add_prop("linux,bootx-linebytes", &tmp, 4, mem_end);
205         tmp = (u32)bi->dispDeviceBase;
206         if (tmp == 0)
207                 tmp = (u32)bi->logicalDisplayBase;
208         tmp += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
209         tmp += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
210         bootx_dt_add_prop("linux,bootx-addr", &tmp, 4, mem_end);
211 }
212 
213 static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
214 {
215         unsigned int l = strlen(s) + 1;
216         memcpy((void *)*mem_end, s, l);
217         bootx_dt_strend = *mem_end = *mem_end + l;
218 }
219 
220 static void __init bootx_scan_dt_build_strings(unsigned long base,
221                                                unsigned long node,
222                                                unsigned long *mem_end)
223 {
224         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
225         u32 *cpp, *ppp = &np->properties;
226         unsigned long soff;
227         char *namep;
228 
229         /* Keep refs to known nodes */
230         namep = np->full_name ? (char *)(base + np->full_name) : NULL;
231         if (namep == NULL) {
232                 bootx_printf("Node without a full name !\n");
233                 namep = "";
234         }
235         DBG("* strings: %s\n", namep);
236 
237         if (!strcmp(namep, "/chosen")) {
238                 DBG(" detected /chosen ! adding properties names !\n");
239                 bootx_dt_add_string("linux,bootx", mem_end);
240                 bootx_dt_add_string("linux,stdout-path", mem_end);
241                 bootx_dt_add_string("linux,initrd-start", mem_end);
242                 bootx_dt_add_string("linux,initrd-end", mem_end);
243                 bootx_dt_add_string("bootargs", mem_end);
244                 bootx_node_chosen = node;
245         }
246         if (node == bootx_info->dispDeviceRegEntryOffset) {
247                 DBG(" detected display ! adding properties names !\n");
248                 bootx_dt_add_string("linux,boot-display", mem_end);
249                 bootx_dt_add_string("linux,opened", mem_end);
250                 strlcpy(bootx_disp_path, namep, sizeof(bootx_disp_path));
251         }
252 
253         /* get and store all property names */
254         while (*ppp) {
255                 struct bootx_dt_prop *pp =
256                         (struct bootx_dt_prop *)(base + *ppp);
257 
258                 namep = pp->name ? (char *)(base + pp->name) : NULL;
259                 if (namep == NULL || strcmp(namep, "name") == 0)
260                         goto next;
261                 /* get/create string entry */
262                 soff = bootx_dt_find_string(namep);
263                 if (soff == 0)
264                         bootx_dt_add_string(namep, mem_end);
265         next:
266                 ppp = &pp->next;
267         }
268 
269         /* do all our children */
270         cpp = &np->child;
271         while(*cpp) {
272                 np = (struct bootx_dt_node *)(base + *cpp);
273                 bootx_scan_dt_build_strings(base, *cpp, mem_end);
274                 cpp = &np->sibling;
275         }
276 }
277 
278 static void __init bootx_scan_dt_build_struct(unsigned long base,
279                                               unsigned long node,
280                                               unsigned long *mem_end)
281 {
282         struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
283         u32 *cpp, *ppp = &np->properties;
284         char *namep, *p, *ep, *lp;
285         int l;
286 
287         dt_push_token(OF_DT_BEGIN_NODE, mem_end);
288 
289         /* get the node's full name */
290         namep = np->full_name ? (char *)(base + np->full_name) : NULL;
291         if (namep == NULL)
292                 namep = "";
293         l = strlen(namep);
294 
295         DBG("* struct: %s\n", namep);
296 
297         /* Fixup an Apple bug where they have bogus \0 chars in the
298          * middle of the path in some properties, and extract
299          * the unit name (everything after the last '/').
300          */
301         memcpy((void *)*mem_end, namep, l + 1);
302         namep = (char *)*mem_end;
303         for (lp = p = namep, ep = namep + l; p < ep; p++) {
304                 if (*p == '/')
305                         lp = namep;
306                 else if (*p != 0)
307                         *lp++ = *p;
308         }
309         *lp = 0;
310         *mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);
311 
312         /* get and store all properties */
313         while (*ppp) {
314                 struct bootx_dt_prop *pp =
315                         (struct bootx_dt_prop *)(base + *ppp);
316 
317                 namep = pp->name ? (char *)(base + pp->name) : NULL;
318                 /* Skip "name" */
319                 if (namep == NULL || !strcmp(namep, "name"))
320                         goto next;
321                 /* Skip "bootargs" in /chosen too as we replace it */
322                 if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
323                         goto next;
324 
325                 /* push property head */
326                 bootx_dt_add_prop(namep,
327                                   pp->value ? (void *)(base + pp->value): NULL,
328                                   pp->length, mem_end);
329         next:
330                 ppp = &pp->next;
331         }
332 
333         if (node == bootx_node_chosen) {
334                 bootx_add_chosen_props(base, mem_end);
335                 if (bootx_info->dispDeviceRegEntryOffset == 0)
336                         bootx_add_display_props(base, mem_end, 0);
337         }
338         else if (node == bootx_info->dispDeviceRegEntryOffset)
339                 bootx_add_display_props(base, mem_end, 1);
340 
341         /* do all our children */
342         cpp = &np->child;
343         while(*cpp) {
344                 np = (struct bootx_dt_node *)(base + *cpp);
345                 bootx_scan_dt_build_struct(base, *cpp, mem_end);
346                 cpp = &np->sibling;
347         }
348 
349         dt_push_token(OF_DT_END_NODE, mem_end);
350 }
351 
352 static unsigned long __init bootx_flatten_dt(unsigned long start)
353 {
354         boot_infos_t *bi = bootx_info;
355         unsigned long mem_start, mem_end;
356         struct boot_param_header *hdr;
357         unsigned long base;
358         u64 *rsvmap;
359 
360         /* Start using memory after the big blob passed by BootX, get
361          * some space for the header
362          */
363         mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
364         DBG("Boot params header at: %x\n", mem_start);
365         hdr = (struct boot_param_header *)mem_start;
366         mem_end += sizeof(struct boot_param_header);
367         rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
368         hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
369         mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);
370 
371         /* Get base of tree */
372         base = ((unsigned long)bi) + bi->deviceTreeOffset;
373 
374         /* Build string array */
375         DBG("Building string array at: %x\n", mem_end);
376         DBG("Device Tree Base=%x\n", base);
377         bootx_dt_strbase = mem_end;
378         mem_end += 4;
379         bootx_dt_strend = mem_end;
380         bootx_scan_dt_build_strings(base, 4, &mem_end);
381         /* Add some strings */
382         bootx_dt_add_string("linux,bootx-noscreen", &mem_end);
383         bootx_dt_add_string("linux,bootx-depth", &mem_end);
384         bootx_dt_add_string("linux,bootx-width", &mem_end);
385         bootx_dt_add_string("linux,bootx-height", &mem_end);
386         bootx_dt_add_string("linux,bootx-linebytes", &mem_end);
387         bootx_dt_add_string("linux,bootx-addr", &mem_end);
388         /* Wrap up strings */
389         hdr->off_dt_strings = bootx_dt_strbase - mem_start;
390         hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;
391 
392         /* Build structure */
393         mem_end = _ALIGN(mem_end, 16);
394         DBG("Building device tree structure at: %x\n", mem_end);
395         hdr->off_dt_struct = mem_end - mem_start;
396         bootx_scan_dt_build_struct(base, 4, &mem_end);
397         dt_push_token(OF_DT_END, &mem_end);
398 
399         /* Finish header */
400         hdr->boot_cpuid_phys = 0;
401         hdr->magic = OF_DT_HEADER;
402         hdr->totalsize = mem_end - mem_start;
403         hdr->version = OF_DT_VERSION;
404         /* Version 16 is not backward compatible */
405         hdr->last_comp_version = 0x10;
406 
407         /* Reserve the whole thing and copy the reserve map in, we
408          * also bump mem_reserve_cnt to cause further reservations to
409          * fail since it's too late.
410          */
411         mem_end = _ALIGN(mem_end, PAGE_SIZE);
412         DBG("End of boot params: %x\n", mem_end);
413         rsvmap[0] = mem_start;
414         rsvmap[1] = mem_end;
415         if (bootx_info->ramDisk) {
416                 rsvmap[2] = ((unsigned long)bootx_info) + bootx_info->ramDisk;
417                 rsvmap[3] = rsvmap[2] + bootx_info->ramDiskSize;
418                 rsvmap[4] = 0;
419                 rsvmap[5] = 0;
420         } else {
421                 rsvmap[2] = 0;
422                 rsvmap[3] = 0;
423         }
424 
425         return (unsigned long)hdr;
426 }
427 
428 
429 #ifdef CONFIG_BOOTX_TEXT
430 static void __init btext_welcome(boot_infos_t *bi)
431 {
432         unsigned long flags;
433         unsigned long pvr;
434 
435         bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
436         bootx_printf("\nlinked at        : 0x%x", KERNELBASE);
437         bootx_printf("\nframe buffer at  : 0x%x", bi->dispDeviceBase);
438         bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
439         bootx_printf(" (log)");
440         bootx_printf("\nklimit           : 0x%x",(unsigned long)klimit);
441         bootx_printf("\nboot_info at     : 0x%x", bi);
442         __asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
443         bootx_printf("\nMSR              : 0x%x", flags);
444         __asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
445         bootx_printf("\nPVR              : 0x%x", pvr);
446         pvr >>= 16;
447         if (pvr > 1) {
448             __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
449             bootx_printf("\nHID0             : 0x%x", flags);
450         }
451         if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
452             __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
453             bootx_printf("\nICTC             : 0x%x", flags);
454         }
455 #ifdef DEBUG
456         bootx_printf("\n\n");
457         bootx_printf("bi->deviceTreeOffset   : 0x%x\n",
458                      bi->deviceTreeOffset);
459         bootx_printf("bi->deviceTreeSize     : 0x%x\n",
460                      bi->deviceTreeSize);
461 #endif
462         bootx_printf("\n\n");
463 }
464 #endif /* CONFIG_BOOTX_TEXT */
465 
466 void __init bootx_init(unsigned long r3, unsigned long r4)
467 {
468         boot_infos_t *bi = (boot_infos_t *) r4;
469         unsigned long hdr;
470         unsigned long space;
471         unsigned long ptr, x;
472         char *model;
473         unsigned long offset = reloc_offset();
474 
475         reloc_got2(offset);
476 
477         bootx_info = bi;
478 
479         /* We haven't cleared any bss at this point, make sure
480          * what we need is initialized
481          */
482         bootx_dt_strbase = bootx_dt_strend = 0;
483         bootx_node_chosen = 0;
484         bootx_disp_path[0] = 0;
485 
486         if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
487                 bi->logicalDisplayBase = bi->dispDeviceBase;
488 
489         /* Fixup depth 16 -> 15 as that's what MacOS calls 16bpp */
490         if (bi->dispDeviceDepth == 16)
491                 bi->dispDeviceDepth = 15;
492 
493 
494 #ifdef CONFIG_BOOTX_TEXT
495         ptr = (unsigned long)bi->logicalDisplayBase;
496         ptr += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
497         ptr += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
498         btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
499                             bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
500                             bi->dispDeviceDepth, bi->dispDeviceRowBytes,
501                             (unsigned long)bi->logicalDisplayBase);
502         btext_clearscreen();
503         btext_flushscreen();
504 #endif /* CONFIG_BOOTX_TEXT */
505 
506         /*
507          * Test if boot-info is compatible.  Done only in config
508          * CONFIG_BOOTX_TEXT since there is nothing much we can do
509          * with an incompatible version, except display a message
510          * and eventually hang the processor...
511          *
512          * I'll try to keep enough of boot-info compatible in the
513          * future to always allow display of this message;
514          */
515         if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
516                 bootx_printf(" !!! WARNING - Incompatible version"
517                              " of BootX !!!\n\n\n");
518                 for (;;)
519                         ;
520         }
521         if (bi->architecture != BOOT_ARCH_PCI) {
522                 bootx_printf(" !!! WARNING - Usupported machine"
523                              " architecture !\n");
524                 for (;;)
525                         ;
526         }
527 
528 #ifdef CONFIG_BOOTX_TEXT
529         btext_welcome(bi);
530 #endif
531 
532         /* New BootX enters kernel with MMU off, i/os are not allowed
533          * here. This hack will have been done by the boostrap anyway.
534          */
535         if (bi->version < 4) {
536                 /*
537                  * XXX If this is an iMac, turn off the USB controller.
538                  */
539                 model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
540                                                      4, "model");
541                 if (model
542                     && (strcmp(model, "iMac,1") == 0
543                         || strcmp(model, "PowerMac1,1") == 0)) {
544                         bootx_printf("iMac,1 detected, shutting down USB\n");
545                         out_le32((unsigned __iomem *)0x80880008, 1);    /* XXX */
546                 }
547         }
548 
549         /* Get a pointer that points above the device tree, args, ramdisk,
550          * etc... to use for generating the flattened tree
551          */
552         if (bi->version < 5) {
553                 space = bi->deviceTreeOffset + bi->deviceTreeSize;
554                 if (bi->ramDisk >= space)
555                         space = bi->ramDisk + bi->ramDiskSize;
556         } else
557                 space = bi->totalParamsSize;
558 
559         bootx_printf("Total space used by parameters & ramdisk: 0x%x\n", space);
560 
561         /* New BootX will have flushed all TLBs and enters kernel with
562          * MMU switched OFF, so this should not be useful anymore.
563          */
564         if (bi->version < 4) {
565                 bootx_printf("Touching pages...\n");
566 
567                 /*
568                  * Touch each page to make sure the PTEs for them
569                  * are in the hash table - the aim is to try to avoid
570                  * getting DSI exceptions while copying the kernel image.
571                  */
572                 for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
573                      ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
574                         x = *(volatile unsigned long *)ptr;
575         }
576 
577         /* Ok, now we need to generate a flattened device-tree to pass
578          * to the kernel
579          */
580         bootx_printf("Preparing boot params...\n");
581 
582         hdr = bootx_flatten_dt(space);
583 
584 #ifdef CONFIG_BOOTX_TEXT
585 #ifdef SET_BOOT_BAT
586         bootx_printf("Preparing BAT...\n");
587         btext_prepare_BAT();
588 #else
589         btext_unmap();
590 #endif
591 #endif
592 
593         reloc_got2(-offset);
594 
595         __start(hdr, KERNELBASE + offset, 0);
596 }
597 

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