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[ARM] 4599/1: Preserve ATAG list for use with kexec (2.6.23)
[linux-2.6/openmoko-kernel/knife-kernel.git] / arch / arm / kernel / setup.c
blobbf56eb337df16a9bc5d7c9033023202ba466cccc
1 /*
2 * linux/arch/arm/kernel/setup.c
3 *
4 * Copyright (C) 1995-2001 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/stddef.h>
13 #include <linux/ioport.h>
14 #include <linux/delay.h>
15 #include <linux/utsname.h>
16 #include <linux/initrd.h>
17 #include <linux/console.h>
18 #include <linux/bootmem.h>
19 #include <linux/seq_file.h>
20 #include <linux/screen_info.h>
21 #include <linux/init.h>
22 #include <linux/root_dev.h>
23 #include <linux/cpu.h>
24 #include <linux/interrupt.h>
25 #include <linux/smp.h>
26 #include <linux/fs.h>
27 #include <linux/kexec.h>
28
29 #include <asm/cpu.h>
30 #include <asm/elf.h>
31 #include <asm/procinfo.h>
32 #include <asm/setup.h>
33 #include <asm/mach-types.h>
34 #include <asm/cacheflush.h>
35 #include <asm/tlbflush.h>
36
37 #include <asm/mach/arch.h>
38 #include <asm/mach/irq.h>
39 #include <asm/mach/time.h>
40
41 #include "compat.h"
42
43 #ifndef MEM_SIZE
44 #define MEM_SIZE (16*1024*1024)
45 #endif
46
47 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
48 char fpe_type[8];
49
50 static int __init fpe_setup(char *line)
51 {
52 memcpy(fpe_type, line, 8);
53 return 1;
54 }
55
56 __setup("fpe=", fpe_setup);
57 #endif
58
59 extern void paging_init(struct meminfo *, struct machine_desc *desc);
60 extern void reboot_setup(char *str);
61 extern int root_mountflags;
62 extern void _stext, _text, _etext, __data_start, _edata, _end;
63
64 unsigned int processor_id;
65 unsigned int __machine_arch_type;
66 EXPORT_SYMBOL(__machine_arch_type);
67
68 unsigned int __atags_pointer __initdata;
69
70 unsigned int system_rev;
71 EXPORT_SYMBOL(system_rev);
72
73 unsigned int system_serial_low;
74 EXPORT_SYMBOL(system_serial_low);
75
76 unsigned int system_serial_high;
77 EXPORT_SYMBOL(system_serial_high);
78
79 unsigned int elf_hwcap;
80 EXPORT_SYMBOL(elf_hwcap);
81
82
83 #ifdef MULTI_CPU
84 struct processor processor;
85 #endif
86 #ifdef MULTI_TLB
87 struct cpu_tlb_fns cpu_tlb;
88 #endif
89 #ifdef MULTI_USER
90 struct cpu_user_fns cpu_user;
91 #endif
92 #ifdef MULTI_CACHE
93 struct cpu_cache_fns cpu_cache;
94 #endif
95 #ifdef CONFIG_OUTER_CACHE
96 struct outer_cache_fns outer_cache;
97 #endif
98
99 struct stack {
100 u32 irq[3];
101 u32 abt[3];
102 u32 und[3];
103 } ____cacheline_aligned;
104
105 static struct stack stacks[NR_CPUS];
106
107 char elf_platform[ELF_PLATFORM_SIZE];
108 EXPORT_SYMBOL(elf_platform);
109
110 unsigned long phys_initrd_start __initdata = 0;
111 unsigned long phys_initrd_size __initdata = 0;
112
113 static struct meminfo meminfo __initdata = { 0, };
114 static const char *cpu_name;
115 static const char *machine_name;
116 static char __initdata command_line[COMMAND_LINE_SIZE];
117
118 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
119 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
120 #define ENDIANNESS ((char)endian_test.l)
121
122 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
123
124 /*
125 * Standard memory resources
126 */
127 static struct resource mem_res[] = {
128 {
129 .name = "Video RAM",
130 .start = 0,
131 .end = 0,
132 .flags = IORESOURCE_MEM
133 },
134 {
135 .name = "Kernel text",
136 .start = 0,
137 .end = 0,
138 .flags = IORESOURCE_MEM
139 },
140 {
141 .name = "Kernel data",
142 .start = 0,
143 .end = 0,
144 .flags = IORESOURCE_MEM
145 }
146 };
147
148 #define video_ram mem_res[0]
149 #define kernel_code mem_res[1]
150 #define kernel_data mem_res[2]
151
152 static struct resource io_res[] = {
153 {
154 .name = "reserved",
155 .start = 0x3bc,
156 .end = 0x3be,
157 .flags = IORESOURCE_IO | IORESOURCE_BUSY
158 },
159 {
160 .name = "reserved",
161 .start = 0x378,
162 .end = 0x37f,
163 .flags = IORESOURCE_IO | IORESOURCE_BUSY
164 },
165 {
166 .name = "reserved",
167 .start = 0x278,
168 .end = 0x27f,
169 .flags = IORESOURCE_IO | IORESOURCE_BUSY
170 }
171 };
172
173 #define lp0 io_res[0]
174 #define lp1 io_res[1]
175 #define lp2 io_res[2]
176
177 static const char *cache_types[16] = {
178 "write-through",
179 "write-back",
180 "write-back",
181 "undefined 3",
182 "undefined 4",
183 "undefined 5",
184 "write-back",
185 "write-back",
186 "undefined 8",
187 "undefined 9",
188 "undefined 10",
189 "undefined 11",
190 "undefined 12",
191 "undefined 13",
192 "write-back",
193 "undefined 15",
194 };
195
196 static const char *cache_clean[16] = {
197 "not required",
198 "read-block",
199 "cp15 c7 ops",
200 "undefined 3",
201 "undefined 4",
202 "undefined 5",
203 "cp15 c7 ops",
204 "cp15 c7 ops",
205 "undefined 8",
206 "undefined 9",
207 "undefined 10",
208 "undefined 11",
209 "undefined 12",
210 "undefined 13",
211 "cp15 c7 ops",
212 "undefined 15",
213 };
214
215 static const char *cache_lockdown[16] = {
216 "not supported",
217 "not supported",
218 "not supported",
219 "undefined 3",
220 "undefined 4",
221 "undefined 5",
222 "format A",
223 "format B",
224 "undefined 8",
225 "undefined 9",
226 "undefined 10",
227 "undefined 11",
228 "undefined 12",
229 "undefined 13",
230 "format C",
231 "undefined 15",
232 };
233
234 static const char *proc_arch[] = {
235 "undefined/unknown",
236 "3",
237 "4",
238 "4T",
239 "5",
240 "5T",
241 "5TE",
242 "5TEJ",
243 "6TEJ",
244 "7",
245 "?(11)",
246 "?(12)",
247 "?(13)",
248 "?(14)",
249 "?(15)",
250 "?(16)",
251 "?(17)",
252 };
253
254 #define CACHE_TYPE(x) (((x) >> 25) & 15)
255 #define CACHE_S(x) ((x) & (1 << 24))
256 #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
257 #define CACHE_ISIZE(x) ((x) & 4095)
258
259 #define CACHE_SIZE(y) (((y) >> 6) & 7)
260 #define CACHE_ASSOC(y) (((y) >> 3) & 7)
261 #define CACHE_M(y) ((y) & (1 << 2))
262 #define CACHE_LINE(y) ((y) & 3)
263
264 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
265 {
266 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
267
268 printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
269 cpu, prefix,
270 mult << (8 + CACHE_SIZE(cache)),
271 (mult << CACHE_ASSOC(cache)) >> 1,
272 8 << CACHE_LINE(cache),
273 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
274 CACHE_LINE(cache)));
275 }
276
277 static void __init dump_cpu_info(int cpu)
278 {
279 unsigned int info = read_cpuid(CPUID_CACHETYPE);
280
281 if (info != processor_id) {
282 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
283 cache_types[CACHE_TYPE(info)]);
284 if (CACHE_S(info)) {
285 dump_cache("I cache", cpu, CACHE_ISIZE(info));
286 dump_cache("D cache", cpu, CACHE_DSIZE(info));
287 } else {
288 dump_cache("cache", cpu, CACHE_ISIZE(info));
289 }
290 }
291
292 if (arch_is_coherent())
293 printk("Cache coherency enabled\n");
294 }
295
296 int cpu_architecture(void)
297 {
298 int cpu_arch;
299
300 if ((processor_id & 0x0008f000) == 0) {
301 cpu_arch = CPU_ARCH_UNKNOWN;
302 } else if ((processor_id & 0x0008f000) == 0x00007000) {
303 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
304 } else if ((processor_id & 0x00080000) == 0x00000000) {
305 cpu_arch = (processor_id >> 16) & 7;
306 if (cpu_arch)
307 cpu_arch += CPU_ARCH_ARMv3;
308 } else if ((processor_id & 0x000f0000) == 0x000f0000) {
309 unsigned int mmfr0;
310
311 /* Revised CPUID format. Read the Memory Model Feature
312 * Register 0 and check for VMSAv7 or PMSAv7 */
313 asm("mrc p15, 0, %0, c0, c1, 4"
314 : "=r" (mmfr0));
315 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
316 (mmfr0 & 0x000000f0) == 0x00000030)
317 cpu_arch = CPU_ARCH_ARMv7;
318 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
319 (mmfr0 & 0x000000f0) == 0x00000020)
320 cpu_arch = CPU_ARCH_ARMv6;
321 else
322 cpu_arch = CPU_ARCH_UNKNOWN;
323 } else
324 cpu_arch = CPU_ARCH_UNKNOWN;
325
326 return cpu_arch;
327 }
328
329 /*
330 * These functions re-use the assembly code in head.S, which
331 * already provide the required functionality.
332 */
333 extern struct proc_info_list *lookup_processor_type(unsigned int);
334 extern struct machine_desc *lookup_machine_type(unsigned int);
335
336 static void __init setup_processor(void)
337 {
338 struct proc_info_list *list;
339
340 /*
341 * locate processor in the list of supported processor
342 * types. The linker builds this table for us from the
343 * entries in arch/arm/mm/proc-*.S
344 */
345 list = lookup_processor_type(processor_id);
346 if (!list) {
347 printk("CPU configuration botched (ID %08x), unable "
348 "to continue.\n", processor_id);
349 while (1);
350 }
351
352 cpu_name = list->cpu_name;
353
354 #ifdef MULTI_CPU
355 processor = *list->proc;
356 #endif
357 #ifdef MULTI_TLB
358 cpu_tlb = *list->tlb;
359 #endif
360 #ifdef MULTI_USER
361 cpu_user = *list->user;
362 #endif
363 #ifdef MULTI_CACHE
364 cpu_cache = *list->cache;
365 #endif
366
367 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
368 cpu_name, processor_id, (int)processor_id & 15,
369 proc_arch[cpu_architecture()], cr_alignment);
370
371 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
372 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
373 elf_hwcap = list->elf_hwcap;
374 #ifndef CONFIG_ARM_THUMB
375 elf_hwcap &= ~HWCAP_THUMB;
376 #endif
377
378 cpu_proc_init();
379 }
380
381 /*
382 * cpu_init - initialise one CPU.
383 *
384 * cpu_init dumps the cache information, initialises SMP specific
385 * information, and sets up the per-CPU stacks.
386 */
387 void cpu_init(void)
388 {
389 unsigned int cpu = smp_processor_id();
390 struct stack *stk = &stacks[cpu];
391
392 if (cpu >= NR_CPUS) {
393 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
394 BUG();
395 }
396
397 if (system_state == SYSTEM_BOOTING)
398 dump_cpu_info(cpu);
399
400 /*
401 * setup stacks for re-entrant exception handlers
402 */
403 __asm__ (
404 "msr cpsr_c, %1\n\t"
405 "add sp, %0, %2\n\t"
406 "msr cpsr_c, %3\n\t"
407 "add sp, %0, %4\n\t"
408 "msr cpsr_c, %5\n\t"
409 "add sp, %0, %6\n\t"
410 "msr cpsr_c, %7"
411 :
412 : "r" (stk),
413 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
414 "I" (offsetof(struct stack, irq[0])),
415 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
416 "I" (offsetof(struct stack, abt[0])),
417 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
418 "I" (offsetof(struct stack, und[0])),
419 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
420 : "r14");
421 }
422
423 static struct machine_desc * __init setup_machine(unsigned int nr)
424 {
425 struct machine_desc *list;
426
427 /*
428 * locate machine in the list of supported machines.
429 */
430 list = lookup_machine_type(nr);
431 if (!list) {
432 printk("Machine configuration botched (nr %d), unable "
433 "to continue.\n", nr);
434 while (1);
435 }
436
437 printk("Machine: %s\n", list->name);
438
439 return list;
440 }
441
442 static void __init early_initrd(char **p)
443 {
444 unsigned long start, size;
445
446 start = memparse(*p, p);
447 if (**p == ',') {
448 size = memparse((*p) + 1, p);
449
450 phys_initrd_start = start;
451 phys_initrd_size = size;
452 }
453 }
454 __early_param("initrd=", early_initrd);
455
456 static void __init arm_add_memory(unsigned long start, unsigned long size)
457 {
458 struct membank *bank;
459
460 /*
461 * Ensure that start/size are aligned to a page boundary.
462 * Size is appropriately rounded down, start is rounded up.
463 */
464 size -= start & ~PAGE_MASK;
465
466 bank = &meminfo.bank[meminfo.nr_banks++];
467
468 bank->start = PAGE_ALIGN(start);
469 bank->size = size & PAGE_MASK;
470 bank->node = PHYS_TO_NID(start);
471 }
472
473 /*
474 * Pick out the memory size. We look for mem=size@start,
475 * where start and size are "size[KkMm]"
476 */
477 static void __init early_mem(char **p)
478 {
479 static int usermem __initdata = 0;
480 unsigned long size, start;
481
482 /*
483 * If the user specifies memory size, we
484 * blow away any automatically generated
485 * size.
486 */
487 if (usermem == 0) {
488 usermem = 1;
489 meminfo.nr_banks = 0;
490 }
491
492 start = PHYS_OFFSET;
493 size = memparse(*p, p);
494 if (**p == '@')
495 start = memparse(*p + 1, p);
496
497 arm_add_memory(start, size);
498 }
499 __early_param("mem=", early_mem);
500
501 /*
502 * Initial parsing of the command line.
503 */
504 static void __init parse_cmdline(char **cmdline_p, char *from)
505 {
506 char c = ' ', *to = command_line;
507 int len = 0;
508
509 for (;;) {
510 if (c == ' ') {
511 extern struct early_params __early_begin, __early_end;
512 struct early_params *p;
513
514 for (p = &__early_begin; p < &__early_end; p++) {
515 int len = strlen(p->arg);
516
517 if (memcmp(from, p->arg, len) == 0) {
518 if (to != command_line)
519 to -= 1;
520 from += len;
521 p->fn(&from);
522
523 while (*from != ' ' && *from != '\0')
524 from++;
525 break;
526 }
527 }
528 }
529 c = *from++;
530 if (!c)
531 break;
532 if (COMMAND_LINE_SIZE <= ++len)
533 break;
534 *to++ = c;
535 }
536 *to = '\0';
537 *cmdline_p = command_line;
538 }
539
540 static void __init
541 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
542 {
543 #ifdef CONFIG_BLK_DEV_RAM
544 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
545
546 rd_image_start = image_start;
547 rd_prompt = prompt;
548 rd_doload = doload;
549
550 if (rd_sz)
551 rd_size = rd_sz;
552 #endif
553 }
554
555 static void __init
556 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
557 {
558 struct resource *res;
559 int i;
560
561 kernel_code.start = virt_to_phys(&_text);
562 kernel_code.end = virt_to_phys(&_etext - 1);
563 kernel_data.start = virt_to_phys(&__data_start);
564 kernel_data.end = virt_to_phys(&_end - 1);
565
566 for (i = 0; i < mi->nr_banks; i++) {
567 unsigned long virt_start, virt_end;
568
569 if (mi->bank[i].size == 0)
570 continue;
571
572 virt_start = __phys_to_virt(mi->bank[i].start);
573 virt_end = virt_start + mi->bank[i].size - 1;
574
575 res = alloc_bootmem_low(sizeof(*res));
576 res->name = "System RAM";
577 res->start = __virt_to_phys(virt_start);
578 res->end = __virt_to_phys(virt_end);
579 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
580
581 request_resource(&iomem_resource, res);
582
583 if (kernel_code.start >= res->start &&
584 kernel_code.end <= res->end)
585 request_resource(res, &kernel_code);
586 if (kernel_data.start >= res->start &&
587 kernel_data.end <= res->end)
588 request_resource(res, &kernel_data);
589 }
590
591 if (mdesc->video_start) {
592 video_ram.start = mdesc->video_start;
593 video_ram.end = mdesc->video_end;
594 request_resource(&iomem_resource, &video_ram);
595 }
596
597 /*
598 * Some machines don't have the possibility of ever
599 * possessing lp0, lp1 or lp2
600 */
601 if (mdesc->reserve_lp0)
602 request_resource(&ioport_resource, &lp0);
603 if (mdesc->reserve_lp1)
604 request_resource(&ioport_resource, &lp1);
605 if (mdesc->reserve_lp2)
606 request_resource(&ioport_resource, &lp2);
607 }
608
609 /*
610 * Tag parsing.
611 *
612 * This is the new way of passing data to the kernel at boot time. Rather
613 * than passing a fixed inflexible structure to the kernel, we pass a list
614 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
615 * tag for the list to be recognised (to distinguish the tagged list from
616 * a param_struct). The list is terminated with a zero-length tag (this tag
617 * is not parsed in any way).
618 */
619 static int __init parse_tag_core(const struct tag *tag)
620 {
621 if (tag->hdr.size > 2) {
622 if ((tag->u.core.flags & 1) == 0)
623 root_mountflags &= ~MS_RDONLY;
624 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
625 }
626 return 0;
627 }
628
629 __tagtable(ATAG_CORE, parse_tag_core);
630
631 static int __init parse_tag_mem32(const struct tag *tag)
632 {
633 if (meminfo.nr_banks >= NR_BANKS) {
634 printk(KERN_WARNING
635 "Ignoring memory bank 0x%08x size %dKB\n",
636 tag->u.mem.start, tag->u.mem.size / 1024);
637 return -EINVAL;
638 }
639 arm_add_memory(tag->u.mem.start, tag->u.mem.size);
640 return 0;
641 }
642
643 __tagtable(ATAG_MEM, parse_tag_mem32);
644
645 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
646 struct screen_info screen_info = {
647 .orig_video_lines = 30,
648 .orig_video_cols = 80,
649 .orig_video_mode = 0,
650 .orig_video_ega_bx = 0,
651 .orig_video_isVGA = 1,
652 .orig_video_points = 8
653 };
654
655 static int __init parse_tag_videotext(const struct tag *tag)
656 {
657 screen_info.orig_x = tag->u.videotext.x;
658 screen_info.orig_y = tag->u.videotext.y;
659 screen_info.orig_video_page = tag->u.videotext.video_page;
660 screen_info.orig_video_mode = tag->u.videotext.video_mode;
661 screen_info.orig_video_cols = tag->u.videotext.video_cols;
662 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
663 screen_info.orig_video_lines = tag->u.videotext.video_lines;
664 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
665 screen_info.orig_video_points = tag->u.videotext.video_points;
666 return 0;
667 }
668
669 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
670 #endif
671
672 static int __init parse_tag_ramdisk(const struct tag *tag)
673 {
674 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
675 (tag->u.ramdisk.flags & 2) == 0,
676 tag->u.ramdisk.start, tag->u.ramdisk.size);
677 return 0;
678 }
679
680 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
681
682 static int __init parse_tag_initrd(const struct tag *tag)
683 {
684 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
685 "please update your bootloader.\n");
686 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
687 phys_initrd_size = tag->u.initrd.size;
688 return 0;
689 }
690
691 __tagtable(ATAG_INITRD, parse_tag_initrd);
692
693 static int __init parse_tag_initrd2(const struct tag *tag)
694 {
695 phys_initrd_start = tag->u.initrd.start;
696 phys_initrd_size = tag->u.initrd.size;
697 return 0;
698 }
699
700 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
701
702 static int __init parse_tag_serialnr(const struct tag *tag)
703 {
704 system_serial_low = tag->u.serialnr.low;
705 system_serial_high = tag->u.serialnr.high;
706 return 0;
707 }
708
709 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
710
711 static int __init parse_tag_revision(const struct tag *tag)
712 {
713 system_rev = tag->u.revision.rev;
714 return 0;
715 }
716
717 __tagtable(ATAG_REVISION, parse_tag_revision);
718
719 static int __init parse_tag_cmdline(const struct tag *tag)
720 {
721 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
722 return 0;
723 }
724
725 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
726
727 /*
728 * Scan the tag table for this tag, and call its parse function.
729 * The tag table is built by the linker from all the __tagtable
730 * declarations.
731 */
732 static int __init parse_tag(const struct tag *tag)
733 {
734 extern struct tagtable __tagtable_begin, __tagtable_end;
735 struct tagtable *t;
736
737 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
738 if (tag->hdr.tag == t->tag) {
739 t->parse(tag);
740 break;
741 }
742
743 return t < &__tagtable_end;
744 }
745
746 /*
747 * Parse all tags in the list, checking both the global and architecture
748 * specific tag tables.
749 */
750 static void __init parse_tags(const struct tag *t)
751 {
752 for (; t->hdr.size; t = tag_next(t))
753 if (!parse_tag(t))
754 printk(KERN_WARNING
755 "Ignoring unrecognised tag 0x%08x\n",
756 t->hdr.tag);
757 }
758
759 /*
760 * This holds our defaults.
761 */
762 static struct init_tags {
763 struct tag_header hdr1;
764 struct tag_core core;
765 struct tag_header hdr2;
766 struct tag_mem32 mem;
767 struct tag_header hdr3;
768 } init_tags __initdata = {
769 { tag_size(tag_core), ATAG_CORE },
770 { 1, PAGE_SIZE, 0xff },
771 { tag_size(tag_mem32), ATAG_MEM },
772 { MEM_SIZE, PHYS_OFFSET },
773 { 0, ATAG_NONE }
774 };
775
776 static void (*init_machine)(void) __initdata;
777
778 static int __init customize_machine(void)
779 {
780 /* customizes platform devices, or adds new ones */
781 if (init_machine)
782 init_machine();
783 return 0;
784 }
785 arch_initcall(customize_machine);
786
787 #ifdef CONFIG_KEXEC
788
789 /* Physical addr of where the boot params should be for this machine */
790 extern unsigned long kexec_boot_params_address;
791
792 /* Physical addr of the buffer into which the boot params are copied */
793 extern unsigned long kexec_boot_params_copy;
794
795 /* Pointer to the boot params buffer, for manipulation and display */
796 unsigned long kexec_boot_params;
797 EXPORT_SYMBOL(kexec_boot_params);
798
799 /* The buffer itself - make sure it is sized correctly */
800 static unsigned long kexec_boot_params_buf[(KEXEC_BOOT_PARAMS_SIZE + 3) / 4];
801
802 #endif
803
804 void __init setup_arch(char **cmdline_p)
805 {
806 struct tag *tags = (struct tag *)&init_tags;
807 struct machine_desc *mdesc;
808 char *from = default_command_line;
809
810 setup_processor();
811 mdesc = setup_machine(machine_arch_type);
812 machine_name = mdesc->name;
813
814 if (mdesc->soft_reboot)
815 reboot_setup("s");
816
817 if (__atags_pointer)
818 tags = phys_to_virt(__atags_pointer);
819 else if (mdesc->boot_params)
820 tags = phys_to_virt(mdesc->boot_params);
821
822 #ifdef CONFIG_KEXEC
823 kexec_boot_params_copy = virt_to_phys(kexec_boot_params_buf);
824 kexec_boot_params = (unsigned long)kexec_boot_params_buf;
825 if (__atags_pointer) {
826 kexec_boot_params_address = __atags_pointer;
827 memcpy((void *)kexec_boot_params, tags, KEXEC_BOOT_PARAMS_SIZE);
828 } else if (mdesc->boot_params) {
829 kexec_boot_params_address = mdesc->boot_params;
830 memcpy((void *)kexec_boot_params, tags, KEXEC_BOOT_PARAMS_SIZE);
831 }
832 #endif
833
834 /*
835 * If we have the old style parameters, convert them to
836 * a tag list.
837 */
838 if (tags->hdr.tag != ATAG_CORE)
839 convert_to_tag_list(tags);
840 if (tags->hdr.tag != ATAG_CORE)
841 tags = (struct tag *)&init_tags;
842
843 if (mdesc->fixup)
844 mdesc->fixup(mdesc, tags, &from, &meminfo);
845
846 if (tags->hdr.tag == ATAG_CORE) {
847 if (meminfo.nr_banks != 0)
848 squash_mem_tags(tags);
849 parse_tags(tags);
850 }
851
852 init_mm.start_code = (unsigned long) &_text;
853 init_mm.end_code = (unsigned long) &_etext;
854 init_mm.end_data = (unsigned long) &_edata;
855 init_mm.brk = (unsigned long) &_end;
856
857 memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
858 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
859 parse_cmdline(cmdline_p, from);
860 paging_init(&meminfo, mdesc);
861 request_standard_resources(&meminfo, mdesc);
862
863 #ifdef CONFIG_SMP
864 smp_init_cpus();
865 #endif
866
867 cpu_init();
868
869 /*
870 * Set up various architecture-specific pointers
871 */
872 init_arch_irq = mdesc->init_irq;
873 system_timer = mdesc->timer;
874 init_machine = mdesc->init_machine;
875
876 #ifdef CONFIG_VT
877 #if defined(CONFIG_VGA_CONSOLE)
878 conswitchp = &vga_con;
879 #elif defined(CONFIG_DUMMY_CONSOLE)
880 conswitchp = &dummy_con;
881 #endif
882 #endif
883 }
884
885
886 static int __init topology_init(void)
887 {
888 int cpu;
889
890 for_each_possible_cpu(cpu) {
891 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
892 cpuinfo->cpu.hotpluggable = 1;
893 register_cpu(&cpuinfo->cpu, cpu);
894 }
895
896 return 0;
897 }
898
899 subsys_initcall(topology_init);
900
901 static const char *hwcap_str[] = {
902 "swp",
903 "half",
904 "thumb",
905 "26bit",
906 "fastmult",
907 "fpa",
908 "vfp",
909 "edsp",
910 "java",
911 "iwmmxt",
912 "crunch",
913 NULL
914 };
915
916 static void
917 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
918 {
919 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
920
921 seq_printf(m, "%s size\t\t: %d\n"
922 "%s assoc\t\t: %d\n"
923 "%s line length\t: %d\n"
924 "%s sets\t\t: %d\n",
925 type, mult << (8 + CACHE_SIZE(cache)),
926 type, (mult << CACHE_ASSOC(cache)) >> 1,
927 type, 8 << CACHE_LINE(cache),
928 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
929 CACHE_LINE(cache)));
930 }
931
932 static int c_show(struct seq_file *m, void *v)
933 {
934 int i;
935
936 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
937 cpu_name, (int)processor_id & 15, elf_platform);
938
939 #if defined(CONFIG_SMP)
940 for_each_online_cpu(i) {
941 /*
942 * glibc reads /proc/cpuinfo to determine the number of
943 * online processors, looking for lines beginning with
944 * "processor". Give glibc what it expects.
945 */
946 seq_printf(m, "processor\t: %d\n", i);
947 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
948 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
949 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
950 }
951 #else /* CONFIG_SMP */
952 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
953 loops_per_jiffy / (500000/HZ),
954 (loops_per_jiffy / (5000/HZ)) % 100);
955 #endif
956
957 /* dump out the processor features */
958 seq_puts(m, "Features\t: ");
959
960 for (i = 0; hwcap_str[i]; i++)
961 if (elf_hwcap & (1 << i))
962 seq_printf(m, "%s ", hwcap_str[i]);
963
964 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
965 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
966
967 if ((processor_id & 0x0008f000) == 0x00000000) {
968 /* pre-ARM7 */
969 seq_printf(m, "CPU part\t: %07x\n", processor_id >> 4);
970 } else {
971 if ((processor_id & 0x0008f000) == 0x00007000) {
972 /* ARM7 */
973 seq_printf(m, "CPU variant\t: 0x%02x\n",
974 (processor_id >> 16) & 127);
975 } else {
976 /* post-ARM7 */
977 seq_printf(m, "CPU variant\t: 0x%x\n",
978 (processor_id >> 20) & 15);
979 }
980 seq_printf(m, "CPU part\t: 0x%03x\n",
981 (processor_id >> 4) & 0xfff);
982 }
983 seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
984
985 {
986 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
987 if (cache_info != processor_id) {
988 seq_printf(m, "Cache type\t: %s\n"
989 "Cache clean\t: %s\n"
990 "Cache lockdown\t: %s\n"
991 "Cache format\t: %s\n",
992 cache_types[CACHE_TYPE(cache_info)],
993 cache_clean[CACHE_TYPE(cache_info)],
994 cache_lockdown[CACHE_TYPE(cache_info)],
995 CACHE_S(cache_info) ? "Harvard" : "Unified");
996
997 if (CACHE_S(cache_info)) {
998 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
999 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
1000 } else {
1001 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
1002 }
1003 }
1004 }
1005
1006 seq_puts(m, "\n");
1007
1008 seq_printf(m, "Hardware\t: %s\n", machine_name);
1009 seq_printf(m, "Revision\t: %04x\n", system_rev);
1010 seq_printf(m, "Serial\t\t: %08x%08x\n",
1011 system_serial_high, system_serial_low);
1012
1013 return 0;
1014 }
1015
1016 static void *c_start(struct seq_file *m, loff_t *pos)
1017 {
1018 return *pos < 1 ? (void *)1 : NULL;
1019 }
1020
1021 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1022 {
1023 ++*pos;
1024 return NULL;
1025 }
1026
1027 static void c_stop(struct seq_file *m, void *v)
1028 {
1029 }
1030
1031 struct seq_operations cpuinfo_op = {
1032 .start = c_start,
1033 .next = c_next,
1034 .stop = c_stop,
1035 .show = c_show
1036 };
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