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[ARM] 4736/1: Export atags to userspace and allow kexec to use customised atags
[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
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 };
Linux kernel - Deliverables
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