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