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