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Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +11001/*
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
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +110012#include <linux/kernel.h>
13#include <linux/string.h>
14#include <linux/init.h>
Sam Ravnborg63104ee2006-07-03 23:30:54 +020015#include <linux/utsrelease.h>
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +110016#include <asm/sections.h>
17#include <asm/prom.h>
18#include <asm/page.h>
19#include <asm/bootx.h>
20#include <asm/bootinfo.h>
21#include <asm/btext.h>
22#include <asm/io.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
33extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
34
35static unsigned long __initdata bootx_dt_strbase;
36static unsigned long __initdata bootx_dt_strend;
37static unsigned long __initdata bootx_node_chosen;
38static boot_infos_t * __initdata bootx_info;
39static 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
48static 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 */
89static void __init bootx_printf(const char *format, ...) {}
90#endif /* CONFIG_BOOTX_TEXT */
91
92static 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
119static 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
133static 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
160static void __init bootx_add_chosen_props(unsigned long base,
161 unsigned long *mem_end)
162{
Benjamin Herrenschmidte8222502006-03-28 23:15:54 +1100163 u32 val;
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100164
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000165 bootx_dt_add_prop("linux,bootx", NULL, 0, mem_end);
166
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100167 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
183static void __init bootx_add_display_props(unsigned long base,
Benjamin Herrenschmidt98c82472006-07-04 17:07:18 +1000184 unsigned long *mem_end,
185 int has_real_node)
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100186{
Benjamin Herrenschmidtab134462006-07-03 17:19:48 +1000187 boot_infos_t *bi = bootx_info;
188 u32 tmp;
189
Benjamin Herrenschmidt98c82472006-07-04 17:07:18 +1000190 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
Benjamin Herrenschmidtab134462006-07-03 17:19:48 +1000196 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);
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100210}
211
212static 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
219static 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");
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000238 bootx_dt_add_string("linux,bootx", mem_end);
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100239 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
277static 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
Benjamin Herrenschmidt98c82472006-07-04 17:07:18 +1000332 if (node == bootx_node_chosen) {
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100333 bootx_add_chosen_props(base, mem_end);
Benjamin Herrenschmidt98c82472006-07-04 17:07:18 +1000334 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);
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100339
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
351static 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);
Benjamin Herrenschmidt98c82472006-07-04 17:07:18 +1000380 /* 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 */
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100388 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;
Benjamin Herrenschmidt6cdd2bd2006-08-23 11:45:12 +1000414 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 }
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100423
424 return (unsigned long)hdr;
425}
426
427
428#ifdef CONFIG_BOOTX_TEXT
429static 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
465void __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
Benjamin Herrenschmidtab134462006-07-03 17:19:48 +1000488 /* Fixup depth 16 -> 15 as that's what MacOS calls 16bpp */
489 if (bi->dispDeviceDepth == 16)
490 bi->dispDeviceDepth = 15;
491
Benjamin Herrenschmidt98c82472006-07-04 17:07:18 +1000492
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100493#ifdef CONFIG_BOOTX_TEXT
Benjamin Herrenschmidtab134462006-07-03 17:19:48 +1000494 ptr = (unsigned long)bi->logicalDisplayBase;
495 ptr += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
496 ptr += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100497 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
Benjamin Herrenschmidt98c82472006-07-04 17:07:18 +1000530
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100531 /* 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");
Stephen Rothwellaf308372006-03-23 17:38:10 +1100544 out_le32((unsigned __iomem *)0x80880008, 1); /* XXX */
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100545 }
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;
Benjamin Herrenschmidt6cdd2bd2006-08-23 11:45:12 +1000553 if (bi->ramDisk >= space)
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100554 space = bi->ramDisk + bi->ramDiskSize;
555 } else
556 space = bi->totalParamsSize;
557
Benjamin Herrenschmidt6cdd2bd2006-08-23 11:45:12 +1000558 bootx_printf("Total space used by parameters & ramdisk: 0x%x \n", space);
Benjamin Herrenschmidtd7f39452005-11-23 17:58:13 +1100559
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}