[ARM] 4736/1: Export atags to userspace and allow kexec to use customised atags
[linux-2.6.git] / arch / arm / kernel / setup.c
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
28 #include <asm/cpu.h>
29 #include <asm/elf.h>
30 #include <asm/procinfo.h>
31 #include <asm/setup.h>
32 #include <asm/mach-types.h>
33 #include <asm/cacheflush.h>
34 #include <asm/tlbflush.h>
35
36 #include <asm/mach/arch.h>
37 #include <asm/mach/irq.h>
38 #include <asm/mach/time.h>
39
40 #include "compat.h"
41 #include "atags.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 void __init setup_arch(char **cmdline_p)
788 {
789         struct tag *tags = (struct tag *)&init_tags;
790         struct machine_desc *mdesc;
791         char *from = default_command_line;
792
793         setup_processor();
794         mdesc = setup_machine(machine_arch_type);
795         machine_name = mdesc->name;
796
797         if (mdesc->soft_reboot)
798                 reboot_setup("s");
799
800         if (__atags_pointer)
801                 tags = phys_to_virt(__atags_pointer);
802         else if (mdesc->boot_params)
803                 tags = phys_to_virt(mdesc->boot_params);
804
805         /*
806          * If we have the old style parameters, convert them to
807          * a tag list.
808          */
809         if (tags->hdr.tag != ATAG_CORE)
810                 convert_to_tag_list(tags);
811         if (tags->hdr.tag != ATAG_CORE)
812                 tags = (struct tag *)&init_tags;
813
814         if (mdesc->fixup)
815                 mdesc->fixup(mdesc, tags, &from, &meminfo);
816
817         if (tags->hdr.tag == ATAG_CORE) {
818                 if (meminfo.nr_banks != 0)
819                         squash_mem_tags(tags);
820                 save_atags(tags);
821                 parse_tags(tags);
822         }
823
824         init_mm.start_code = (unsigned long) &_text;
825         init_mm.end_code   = (unsigned long) &_etext;
826         init_mm.end_data   = (unsigned long) &_edata;
827         init_mm.brk        = (unsigned long) &_end;
828
829         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
830         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
831         parse_cmdline(cmdline_p, from);
832         paging_init(&meminfo, mdesc);
833         request_standard_resources(&meminfo, mdesc);
834
835 #ifdef CONFIG_SMP
836         smp_init_cpus();
837 #endif
838
839         cpu_init();
840
841         /*
842          * Set up various architecture-specific pointers
843          */
844         init_arch_irq = mdesc->init_irq;
845         system_timer = mdesc->timer;
846         init_machine = mdesc->init_machine;
847
848 #ifdef CONFIG_VT
849 #if defined(CONFIG_VGA_CONSOLE)
850         conswitchp = &vga_con;
851 #elif defined(CONFIG_DUMMY_CONSOLE)
852         conswitchp = &dummy_con;
853 #endif
854 #endif
855 }
856
857
858 static int __init topology_init(void)
859 {
860         int cpu;
861
862         for_each_possible_cpu(cpu) {
863                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
864                 cpuinfo->cpu.hotpluggable = 1;
865                 register_cpu(&cpuinfo->cpu, cpu);
866         }
867
868         return 0;
869 }
870
871 subsys_initcall(topology_init);
872
873 static const char *hwcap_str[] = {
874         "swp",
875         "half",
876         "thumb",
877         "26bit",
878         "fastmult",
879         "fpa",
880         "vfp",
881         "edsp",
882         "java",
883         "iwmmxt",
884         "crunch",
885         NULL
886 };
887
888 static void
889 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
890 {
891         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
892
893         seq_printf(m, "%s size\t\t: %d\n"
894                       "%s assoc\t\t: %d\n"
895                       "%s line length\t: %d\n"
896                       "%s sets\t\t: %d\n",
897                 type, mult << (8 + CACHE_SIZE(cache)),
898                 type, (mult << CACHE_ASSOC(cache)) >> 1,
899                 type, 8 << CACHE_LINE(cache),
900                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
901                             CACHE_LINE(cache)));
902 }
903
904 static int c_show(struct seq_file *m, void *v)
905 {
906         int i;
907
908         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
909                    cpu_name, (int)processor_id & 15, elf_platform);
910
911 #if defined(CONFIG_SMP)
912         for_each_online_cpu(i) {
913                 /*
914                  * glibc reads /proc/cpuinfo to determine the number of
915                  * online processors, looking for lines beginning with
916                  * "processor".  Give glibc what it expects.
917                  */
918                 seq_printf(m, "processor\t: %d\n", i);
919                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
920                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
921                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
922         }
923 #else /* CONFIG_SMP */
924         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
925                    loops_per_jiffy / (500000/HZ),
926                    (loops_per_jiffy / (5000/HZ)) % 100);
927 #endif
928
929         /* dump out the processor features */
930         seq_puts(m, "Features\t: ");
931
932         for (i = 0; hwcap_str[i]; i++)
933                 if (elf_hwcap & (1 << i))
934                         seq_printf(m, "%s ", hwcap_str[i]);
935
936         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
937         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
938
939         if ((processor_id & 0x0008f000) == 0x00000000) {
940                 /* pre-ARM7 */
941                 seq_printf(m, "CPU part\t: %07x\n", processor_id >> 4);
942         } else {
943                 if ((processor_id & 0x0008f000) == 0x00007000) {
944                         /* ARM7 */
945                         seq_printf(m, "CPU variant\t: 0x%02x\n",
946                                    (processor_id >> 16) & 127);
947                 } else {
948                         /* post-ARM7 */
949                         seq_printf(m, "CPU variant\t: 0x%x\n",
950                                    (processor_id >> 20) & 15);
951                 }
952                 seq_printf(m, "CPU part\t: 0x%03x\n",
953                            (processor_id >> 4) & 0xfff);
954         }
955         seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
956
957         {
958                 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
959                 if (cache_info != processor_id) {
960                         seq_printf(m, "Cache type\t: %s\n"
961                                       "Cache clean\t: %s\n"
962                                       "Cache lockdown\t: %s\n"
963                                       "Cache format\t: %s\n",
964                                    cache_types[CACHE_TYPE(cache_info)],
965                                    cache_clean[CACHE_TYPE(cache_info)],
966                                    cache_lockdown[CACHE_TYPE(cache_info)],
967                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
968
969                         if (CACHE_S(cache_info)) {
970                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
971                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
972                         } else {
973                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
974                         }
975                 }
976         }
977
978         seq_puts(m, "\n");
979
980         seq_printf(m, "Hardware\t: %s\n", machine_name);
981         seq_printf(m, "Revision\t: %04x\n", system_rev);
982         seq_printf(m, "Serial\t\t: %08x%08x\n",
983                    system_serial_high, system_serial_low);
984
985         return 0;
986 }
987
988 static void *c_start(struct seq_file *m, loff_t *pos)
989 {
990         return *pos < 1 ? (void *)1 : NULL;
991 }
992
993 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
994 {
995         ++*pos;
996         return NULL;
997 }
998
999 static void c_stop(struct seq_file *m, void *v)
1000 {
1001 }
1002
1003 struct seq_operations cpuinfo_op = {
1004         .start  = c_start,
1005         .next   = c_next,
1006         .stop   = c_stop,
1007         .show   = c_show
1008 };