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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / arm / kernel / setup.c
blob3fe93f75b55a4be2438bd258cbca189106078645
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/kexec.h>
23 #include <linux/of_fdt.h>
24 #include <linux/crash_dump.h>
25 #include <linux/root_dev.h>
26 #include <linux/cpu.h>
27 #include <linux/interrupt.h>
28 #include <linux/smp.h>
29 #include <linux/fs.h>
30 #include <linux/proc_fs.h>
31 #include <linux/memblock.h>
32 #include <linux/bug.h>
33 #include <linux/compiler.h>
34
35 #include <asm/unified.h>
36 #include <asm/cpu.h>
37 #include <asm/cputype.h>
38 #include <asm/elf.h>
39 #include <asm/procinfo.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/smp_plat.h>
43 #include <asm/mach-types.h>
44 #include <asm/cacheflush.h>
45 #include <asm/cachetype.h>
46 #include <asm/tlbflush.h>
47 #include <asm/system.h>
48
49 #include <asm/prom.h>
50 #include <asm/mach/arch.h>
51 #include <asm/mach/irq.h>
52 #include <asm/mach/time.h>
53 #include <asm/traps.h>
54 #include <asm/unwind.h>
55
56 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
57 #include "compat.h"
58 #endif
59 #include "atags.h"
60 #include "tcm.h"
61
62 #ifndef MEM_SIZE
63 #define MEM_SIZE (16*1024*1024)
64 #endif
65
66 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
67 char fpe_type[8];
68
69 static int __init fpe_setup(char *line)
70 {
71 memcpy(fpe_type, line, 8);
72 return 1;
73 }
74
75 __setup("fpe=", fpe_setup);
76 #endif
77
78 extern void paging_init(struct machine_desc *desc);
79 extern void sanity_check_meminfo(void);
80 extern void reboot_setup(char *str);
81
82 unsigned int processor_id;
83 EXPORT_SYMBOL(processor_id);
84 unsigned int __machine_arch_type __read_mostly;
85 EXPORT_SYMBOL(__machine_arch_type);
86 unsigned int cacheid __read_mostly;
87 EXPORT_SYMBOL(cacheid);
88
89 unsigned int __atags_pointer __initdata;
90
91 unsigned int system_rev;
92 EXPORT_SYMBOL(system_rev);
93
94 unsigned int system_serial_low;
95 EXPORT_SYMBOL(system_serial_low);
96
97 unsigned int system_serial_high;
98 EXPORT_SYMBOL(system_serial_high);
99
100 unsigned int elf_hwcap __read_mostly;
101 EXPORT_SYMBOL(elf_hwcap);
102
103
104 #ifdef MULTI_CPU
105 struct processor processor __read_mostly;
106 #endif
107 #ifdef MULTI_TLB
108 struct cpu_tlb_fns cpu_tlb __read_mostly;
109 #endif
110 #ifdef MULTI_USER
111 struct cpu_user_fns cpu_user __read_mostly;
112 #endif
113 #ifdef MULTI_CACHE
114 struct cpu_cache_fns cpu_cache __read_mostly;
115 #endif
116 #ifdef CONFIG_OUTER_CACHE
117 struct outer_cache_fns outer_cache __read_mostly;
118 EXPORT_SYMBOL(outer_cache);
119 #endif
120
121 /*
122 * Cached cpu_architecture() result for use by assembler code.
123 * C code should use the cpu_architecture() function instead of accessing this
124 * variable directly.
125 */
126 int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
127
128 struct stack {
129 u32 irq[3];
130 u32 abt[3];
131 u32 und[3];
132 } ____cacheline_aligned;
133
134 static struct stack stacks[NR_CPUS];
135
136 char elf_platform[ELF_PLATFORM_SIZE];
137 EXPORT_SYMBOL(elf_platform);
138
139 static const char *cpu_name;
140 static const char *machine_name;
141 static char __initdata cmd_line[COMMAND_LINE_SIZE];
142 struct machine_desc *machine_desc __initdata;
143
144 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
145 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
146 #define ENDIANNESS ((char)endian_test.l)
147
148 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
149
150 /*
151 * Standard memory resources
152 */
153 static struct resource mem_res[] = {
154 {
155 .name = "Video RAM",
156 .start = 0,
157 .end = 0,
158 .flags = IORESOURCE_MEM
159 },
160 {
161 .name = "Kernel text",
162 .start = 0,
163 .end = 0,
164 .flags = IORESOURCE_MEM
165 },
166 {
167 .name = "Kernel data",
168 .start = 0,
169 .end = 0,
170 .flags = IORESOURCE_MEM
171 }
172 };
173
174 #define video_ram mem_res[0]
175 #define kernel_code mem_res[1]
176 #define kernel_data mem_res[2]
177
178 static struct resource io_res[] = {
179 {
180 .name = "reserved",
181 .start = 0x3bc,
182 .end = 0x3be,
183 .flags = IORESOURCE_IO | IORESOURCE_BUSY
184 },
185 {
186 .name = "reserved",
187 .start = 0x378,
188 .end = 0x37f,
189 .flags = IORESOURCE_IO | IORESOURCE_BUSY
190 },
191 {
192 .name = "reserved",
193 .start = 0x278,
194 .end = 0x27f,
195 .flags = IORESOURCE_IO | IORESOURCE_BUSY
196 }
197 };
198
199 #define lp0 io_res[0]
200 #define lp1 io_res[1]
201 #define lp2 io_res[2]
202
203 static const char *proc_arch[] = {
204 "undefined/unknown",
205 "3",
206 "4",
207 "4T",
208 "5",
209 "5T",
210 "5TE",
211 "5TEJ",
212 "6TEJ",
213 "7",
214 "?(11)",
215 "?(12)",
216 "?(13)",
217 "?(14)",
218 "?(15)",
219 "?(16)",
220 "?(17)",
221 };
222
223 static int __get_cpu_architecture(void)
224 {
225 int cpu_arch;
226
227 if ((read_cpuid_id() & 0x0008f000) == 0) {
228 cpu_arch = CPU_ARCH_UNKNOWN;
229 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
230 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
231 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
232 cpu_arch = (read_cpuid_id() >> 16) & 7;
233 if (cpu_arch)
234 cpu_arch += CPU_ARCH_ARMv3;
235 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
236 unsigned int mmfr0;
237
238 /* Revised CPUID format. Read the Memory Model Feature
239 * Register 0 and check for VMSAv7 or PMSAv7 */
240 asm("mrc p15, 0, %0, c0, c1, 4"
241 : "=r" (mmfr0));
242 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
243 (mmfr0 & 0x000000f0) >= 0x00000030)
244 cpu_arch = CPU_ARCH_ARMv7;
245 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
246 (mmfr0 & 0x000000f0) == 0x00000020)
247 cpu_arch = CPU_ARCH_ARMv6;
248 else
249 cpu_arch = CPU_ARCH_UNKNOWN;
250 } else
251 cpu_arch = CPU_ARCH_UNKNOWN;
252
253 return cpu_arch;
254 }
255
256 int __pure cpu_architecture(void)
257 {
258 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
259
260 return __cpu_architecture;
261 }
262
263 static int cpu_has_aliasing_icache(unsigned int arch)
264 {
265 int aliasing_icache;
266 unsigned int id_reg, num_sets, line_size;
267
268 /* PIPT caches never alias. */
269 if (icache_is_pipt())
270 return 0;
271
272 /* arch specifies the register format */
273 switch (arch) {
274 case CPU_ARCH_ARMv7:
275 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
276 : /* No output operands */
277 : "r" (1));
278 isb();
279 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
280 : "=r" (id_reg));
281 line_size = 4 << ((id_reg & 0x7) + 2);
282 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
283 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
284 break;
285 case CPU_ARCH_ARMv6:
286 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
287 break;
288 default:
289 /* I-cache aliases will be handled by D-cache aliasing code */
290 aliasing_icache = 0;
291 }
292
293 return aliasing_icache;
294 }
295
296 static void __init cacheid_init(void)
297 {
298 unsigned int cachetype = read_cpuid_cachetype();
299 unsigned int arch = cpu_architecture();
300
301 if (arch >= CPU_ARCH_ARMv6) {
302 if ((cachetype & (7 << 29)) == 4 << 29) {
303 /* ARMv7 register format */
304 arch = CPU_ARCH_ARMv7;
305 cacheid = CACHEID_VIPT_NONALIASING;
306 switch (cachetype & (3 << 14)) {
307 case (1 << 14):
308 cacheid |= CACHEID_ASID_TAGGED;
309 break;
310 case (3 << 14):
311 cacheid |= CACHEID_PIPT;
312 break;
313 }
314 } else {
315 arch = CPU_ARCH_ARMv6;
316 if (cachetype & (1 << 23))
317 cacheid = CACHEID_VIPT_ALIASING;
318 else
319 cacheid = CACHEID_VIPT_NONALIASING;
320 }
321 if (cpu_has_aliasing_icache(arch))
322 cacheid |= CACHEID_VIPT_I_ALIASING;
323 } else {
324 cacheid = CACHEID_VIVT;
325 }
326
327 printk("CPU: %s data cache, %s instruction cache\n",
328 cache_is_vivt() ? "VIVT" :
329 cache_is_vipt_aliasing() ? "VIPT aliasing" :
330 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
331 cache_is_vivt() ? "VIVT" :
332 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
333 icache_is_vipt_aliasing() ? "VIPT aliasing" :
334 icache_is_pipt() ? "PIPT" :
335 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
336 }
337
338 /*
339 * These functions re-use the assembly code in head.S, which
340 * already provide the required functionality.
341 */
342 extern struct proc_info_list *lookup_processor_type(unsigned int);
343
344 void __init early_print(const char *str, ...)
345 {
346 extern void printascii(const char *);
347 char buf[256];
348 va_list ap;
349
350 va_start(ap, str);
351 vsnprintf(buf, sizeof(buf), str, ap);
352 va_end(ap);
353
354 #ifdef CONFIG_DEBUG_LL
355 printascii(buf);
356 #endif
357 printk("%s", buf);
358 }
359
360 static void __init feat_v6_fixup(void)
361 {
362 int id = read_cpuid_id();
363
364 if ((id & 0xff0f0000) != 0x41070000)
365 return;
366
367 /*
368 * HWCAP_TLS is available only on 1136 r1p0 and later,
369 * see also kuser_get_tls_init.
370 */
371 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
372 elf_hwcap &= ~HWCAP_TLS;
373 }
374
375 /*
376 * cpu_init - initialise one CPU.
377 *
378 * cpu_init sets up the per-CPU stacks.
379 */
380 void cpu_init(void)
381 {
382 unsigned int cpu = smp_processor_id();
383 struct stack *stk = &stacks[cpu];
384
385 if (cpu >= NR_CPUS) {
386 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
387 BUG();
388 }
389
390 cpu_proc_init();
391
392 /*
393 * Define the placement constraint for the inline asm directive below.
394 * In Thumb-2, msr with an immediate value is not allowed.
395 */
396 #ifdef CONFIG_THUMB2_KERNEL
397 #define PLC "r"
398 #else
399 #define PLC "I"
400 #endif
401
402 /*
403 * setup stacks for re-entrant exception handlers
404 */
405 __asm__ (
406 "msr cpsr_c, %1\n\t"
407 "add r14, %0, %2\n\t"
408 "mov sp, r14\n\t"
409 "msr cpsr_c, %3\n\t"
410 "add r14, %0, %4\n\t"
411 "mov sp, r14\n\t"
412 "msr cpsr_c, %5\n\t"
413 "add r14, %0, %6\n\t"
414 "mov sp, r14\n\t"
415 "msr cpsr_c, %7"
416 :
417 : "r" (stk),
418 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
419 "I" (offsetof(struct stack, irq[0])),
420 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
421 "I" (offsetof(struct stack, abt[0])),
422 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
423 "I" (offsetof(struct stack, und[0])),
424 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
425 : "r14");
426 }
427
428 static void __init setup_processor(void)
429 {
430 struct proc_info_list *list;
431
432 /*
433 * locate processor in the list of supported processor
434 * types. The linker builds this table for us from the
435 * entries in arch/arm/mm/proc-*.S
436 */
437 list = lookup_processor_type(read_cpuid_id());
438 if (!list) {
439 printk("CPU configuration botched (ID %08x), unable "
440 "to continue.\n", read_cpuid_id());
441 while (1);
442 }
443
444 cpu_name = list->cpu_name;
445 __cpu_architecture = __get_cpu_architecture();
446
447 #ifdef MULTI_CPU
448 processor = *list->proc;
449 #endif
450 #ifdef MULTI_TLB
451 cpu_tlb = *list->tlb;
452 #endif
453 #ifdef MULTI_USER
454 cpu_user = *list->user;
455 #endif
456 #ifdef MULTI_CACHE
457 cpu_cache = *list->cache;
458 #endif
459
460 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
461 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
462 proc_arch[cpu_architecture()], cr_alignment);
463
464 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
465 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
466 elf_hwcap = list->elf_hwcap;
467 #ifndef CONFIG_ARM_THUMB
468 elf_hwcap &= ~HWCAP_THUMB;
469 #endif
470
471 feat_v6_fixup();
472
473 cacheid_init();
474 cpu_init();
475 }
476
477 void __init dump_machine_table(void)
478 {
479 struct machine_desc *p;
480
481 early_print("Available machine support:\n\nID (hex)\tNAME\n");
482 for_each_machine_desc(p)
483 early_print("%08x\t%s\n", p->nr, p->name);
484
485 early_print("\nPlease check your kernel config and/or bootloader.\n");
486
487 while (true)
488 /* can't use cpu_relax() here as it may require MMU setup */;
489 }
490
491 int __init arm_add_memory(phys_addr_t start, unsigned long size)
492 {
493 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
494
495 if (meminfo.nr_banks >= NR_BANKS) {
496 printk(KERN_CRIT "NR_BANKS too low, "
497 "ignoring memory at 0x%08llx\n", (long long)start);
498 return -EINVAL;
499 }
500
501 /*
502 * Ensure that start/size are aligned to a page boundary.
503 * Size is appropriately rounded down, start is rounded up.
504 */
505 size -= start & ~PAGE_MASK;
506 bank->start = PAGE_ALIGN(start);
507 bank->size = size & PAGE_MASK;
508
509 /*
510 * Check whether this memory region has non-zero size or
511 * invalid node number.
512 */
513 if (bank->size == 0)
514 return -EINVAL;
515
516 meminfo.nr_banks++;
517 return 0;
518 }
519
520 /*
521 * Pick out the memory size. We look for mem=size@start,
522 * where start and size are "size[KkMm]"
523 */
524 static int __init early_mem(char *p)
525 {
526 static int usermem __initdata = 0;
527 unsigned long size;
528 phys_addr_t start;
529 char *endp;
530
531 /*
532 * If the user specifies memory size, we
533 * blow away any automatically generated
534 * size.
535 */
536 if (usermem == 0) {
537 usermem = 1;
538 meminfo.nr_banks = 0;
539 }
540
541 start = PHYS_OFFSET;
542 size = memparse(p, &endp);
543 if (*endp == '@')
544 start = memparse(endp + 1, NULL);
545
546 arm_add_memory(start, size);
547
548 return 0;
549 }
550 early_param("mem", early_mem);
551
552 static void __init
553 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
554 {
555 #ifdef CONFIG_BLK_DEV_RAM
556 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
557
558 rd_image_start = image_start;
559 rd_prompt = prompt;
560 rd_doload = doload;
561
562 if (rd_sz)
563 rd_size = rd_sz;
564 #endif
565 }
566
567 static void __init request_standard_resources(struct machine_desc *mdesc)
568 {
569 struct memblock_region *region;
570 struct resource *res;
571
572 kernel_code.start = virt_to_phys(_text);
573 kernel_code.end = virt_to_phys(_etext - 1);
574 kernel_data.start = virt_to_phys(_sdata);
575 kernel_data.end = virt_to_phys(_end - 1);
576
577 for_each_memblock(memory, region) {
578 res = alloc_bootmem_low(sizeof(*res));
579 res->name = "System RAM";
580 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
581 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
582 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
583
584 request_resource(&iomem_resource, res);
585
586 if (kernel_code.start >= res->start &&
587 kernel_code.end <= res->end)
588 request_resource(res, &kernel_code);
589 if (kernel_data.start >= res->start &&
590 kernel_data.end <= res->end)
591 request_resource(res, &kernel_data);
592 }
593
594 if (mdesc->video_start) {
595 video_ram.start = mdesc->video_start;
596 video_ram.end = mdesc->video_end;
597 request_resource(&iomem_resource, &video_ram);
598 }
599
600 /*
601 * Some machines don't have the possibility of ever
602 * possessing lp0, lp1 or lp2
603 */
604 if (mdesc->reserve_lp0)
605 request_resource(&ioport_resource, &lp0);
606 if (mdesc->reserve_lp1)
607 request_resource(&ioport_resource, &lp1);
608 if (mdesc->reserve_lp2)
609 request_resource(&ioport_resource, &lp2);
610 }
611
612 /*
613 * Tag parsing.
614 *
615 * This is the new way of passing data to the kernel at boot time. Rather
616 * than passing a fixed inflexible structure to the kernel, we pass a list
617 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
618 * tag for the list to be recognised (to distinguish the tagged list from
619 * a param_struct). The list is terminated with a zero-length tag (this tag
620 * is not parsed in any way).
621 */
622 static int __init parse_tag_core(const struct tag *tag)
623 {
624 if (tag->hdr.size > 2) {
625 if ((tag->u.core.flags & 1) == 0)
626 root_mountflags &= ~MS_RDONLY;
627 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
628 }
629 return 0;
630 }
631
632 __tagtable(ATAG_CORE, parse_tag_core);
633
634 static int __init parse_tag_mem32(const struct tag *tag)
635 {
636 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
637 }
638
639 __tagtable(ATAG_MEM, parse_tag_mem32);
640
641 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
642 struct screen_info screen_info = {
643 .orig_video_lines = 30,
644 .orig_video_cols = 80,
645 .orig_video_mode = 0,
646 .orig_video_ega_bx = 0,
647 .orig_video_isVGA = 1,
648 .orig_video_points = 8
649 };
650
651 static int __init parse_tag_videotext(const struct tag *tag)
652 {
653 screen_info.orig_x = tag->u.videotext.x;
654 screen_info.orig_y = tag->u.videotext.y;
655 screen_info.orig_video_page = tag->u.videotext.video_page;
656 screen_info.orig_video_mode = tag->u.videotext.video_mode;
657 screen_info.orig_video_cols = tag->u.videotext.video_cols;
658 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
659 screen_info.orig_video_lines = tag->u.videotext.video_lines;
660 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
661 screen_info.orig_video_points = tag->u.videotext.video_points;
662 return 0;
663 }
664
665 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
666 #endif
667
668 static int __init parse_tag_ramdisk(const struct tag *tag)
669 {
670 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
671 (tag->u.ramdisk.flags & 2) == 0,
672 tag->u.ramdisk.start, tag->u.ramdisk.size);
673 return 0;
674 }
675
676 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
677
678 static int __init parse_tag_serialnr(const struct tag *tag)
679 {
680 system_serial_low = tag->u.serialnr.low;
681 system_serial_high = tag->u.serialnr.high;
682 return 0;
683 }
684
685 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
686
687 static int __init parse_tag_revision(const struct tag *tag)
688 {
689 system_rev = tag->u.revision.rev;
690 return 0;
691 }
692
693 __tagtable(ATAG_REVISION, parse_tag_revision);
694
695 static int __init parse_tag_cmdline(const struct tag *tag)
696 {
697 #if defined(CONFIG_CMDLINE_EXTEND)
698 strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
699 strlcat(default_command_line, tag->u.cmdline.cmdline,
700 COMMAND_LINE_SIZE);
701 #elif defined(CONFIG_CMDLINE_FORCE)
702 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
703 #else
704 strlcpy(default_command_line, tag->u.cmdline.cmdline,
705 COMMAND_LINE_SIZE);
706 #endif
707 return 0;
708 }
709
710 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
711
712 /*
713 * Scan the tag table for this tag, and call its parse function.
714 * The tag table is built by the linker from all the __tagtable
715 * declarations.
716 */
717 static int __init parse_tag(const struct tag *tag)
718 {
719 extern struct tagtable __tagtable_begin, __tagtable_end;
720 struct tagtable *t;
721
722 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
723 if (tag->hdr.tag == t->tag) {
724 t->parse(tag);
725 break;
726 }
727
728 return t < &__tagtable_end;
729 }
730
731 /*
732 * Parse all tags in the list, checking both the global and architecture
733 * specific tag tables.
734 */
735 static void __init parse_tags(const struct tag *t)
736 {
737 for (; t->hdr.size; t = tag_next(t))
738 if (!parse_tag(t))
739 printk(KERN_WARNING
740 "Ignoring unrecognised tag 0x%08x\n",
741 t->hdr.tag);
742 }
743
744 /*
745 * This holds our defaults.
746 */
747 static struct init_tags {
748 struct tag_header hdr1;
749 struct tag_core core;
750 struct tag_header hdr2;
751 struct tag_mem32 mem;
752 struct tag_header hdr3;
753 } init_tags __initdata = {
754 { tag_size(tag_core), ATAG_CORE },
755 { 1, PAGE_SIZE, 0xff },
756 { tag_size(tag_mem32), ATAG_MEM },
757 { MEM_SIZE },
758 { 0, ATAG_NONE }
759 };
760
761 static int __init customize_machine(void)
762 {
763 /* customizes platform devices, or adds new ones */
764 if (machine_desc->init_machine)
765 machine_desc->init_machine();
766 return 0;
767 }
768 arch_initcall(customize_machine);
769
770 #ifdef CONFIG_KEXEC
771 static inline unsigned long long get_total_mem(void)
772 {
773 unsigned long total;
774
775 total = max_low_pfn - min_low_pfn;
776 return total << PAGE_SHIFT;
777 }
778
779 /**
780 * reserve_crashkernel() - reserves memory are for crash kernel
781 *
782 * This function reserves memory area given in "crashkernel=" kernel command
783 * line parameter. The memory reserved is used by a dump capture kernel when
784 * primary kernel is crashing.
785 */
786 static void __init reserve_crashkernel(void)
787 {
788 unsigned long long crash_size, crash_base;
789 unsigned long long total_mem;
790 int ret;
791
792 total_mem = get_total_mem();
793 ret = parse_crashkernel(boot_command_line, total_mem,
794 &crash_size, &crash_base);
795 if (ret)
796 return;
797
798 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
799 if (ret < 0) {
800 printk(KERN_WARNING "crashkernel reservation failed - "
801 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
802 return;
803 }
804
805 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
806 "for crashkernel (System RAM: %ldMB)\n",
807 (unsigned long)(crash_size >> 20),
808 (unsigned long)(crash_base >> 20),
809 (unsigned long)(total_mem >> 20));
810
811 crashk_res.start = crash_base;
812 crashk_res.end = crash_base + crash_size - 1;
813 insert_resource(&iomem_resource, &crashk_res);
814 }
815 #else
816 static inline void reserve_crashkernel(void) {}
817 #endif /* CONFIG_KEXEC */
818
819 static void __init squash_mem_tags(struct tag *tag)
820 {
821 for (; tag->hdr.size; tag = tag_next(tag))
822 if (tag->hdr.tag == ATAG_MEM)
823 tag->hdr.tag = ATAG_NONE;
824 }
825
826 static struct machine_desc * __init setup_machine_tags(unsigned int nr)
827 {
828 struct tag *tags = (struct tag *)&init_tags;
829 struct machine_desc *mdesc = NULL, *p;
830 char *from = default_command_line;
831
832 init_tags.mem.start = PHYS_OFFSET;
833
834 /*
835 * locate machine in the list of supported machines.
836 */
837 for_each_machine_desc(p)
838 if (nr == p->nr) {
839 printk("Machine: %s\n", p->name);
840 mdesc = p;
841 break;
842 }
843
844 if (!mdesc) {
845 early_print("\nError: unrecognized/unsupported machine ID"
846 " (r1 = 0x%08x).\n\n", nr);
847 dump_machine_table(); /* does not return */
848 }
849
850 if (__atags_pointer)
851 tags = phys_to_virt(__atags_pointer);
852 else if (mdesc->boot_params) {
853 #ifdef CONFIG_MMU
854 /*
855 * We still are executing with a minimal MMU mapping created
856 * with the presumption that the machine default for this
857 * is located in the first MB of RAM. Anything else will
858 * fault and silently hang the kernel at this point.
859 */
860 if (mdesc->boot_params < PHYS_OFFSET ||
861 mdesc->boot_params >= PHYS_OFFSET + SZ_1M) {
862 printk(KERN_WARNING
863 "Default boot params at physical 0x%08lx out of reach\n",
864 mdesc->boot_params);
865 } else
866 #endif
867 {
868 tags = phys_to_virt(mdesc->boot_params);
869 }
870 }
871
872 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
873 /*
874 * If we have the old style parameters, convert them to
875 * a tag list.
876 */
877 if (tags->hdr.tag != ATAG_CORE)
878 convert_to_tag_list(tags);
879 #endif
880
881 if (tags->hdr.tag != ATAG_CORE) {
882 #if defined(CONFIG_OF)
883 /*
884 * If CONFIG_OF is set, then assume this is a reasonably
885 * modern system that should pass boot parameters
886 */
887 early_print("Warning: Neither atags nor dtb found\n");
888 #endif
889 tags = (struct tag *)&init_tags;
890 }
891
892 if (mdesc->fixup)
893 mdesc->fixup(tags, &from, &meminfo);
894
895 if (tags->hdr.tag == ATAG_CORE) {
896 if (meminfo.nr_banks != 0)
897 squash_mem_tags(tags);
898 save_atags(tags);
899 parse_tags(tags);
900 }
901
902 /* parse_early_param needs a boot_command_line */
903 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
904
905 return mdesc;
906 }
907
908
909 void __init setup_arch(char **cmdline_p)
910 {
911 struct machine_desc *mdesc;
912
913 unwind_init();
914
915 setup_processor();
916 mdesc = setup_machine_fdt(__atags_pointer);
917 if (!mdesc)
918 mdesc = setup_machine_tags(machine_arch_type);
919 machine_desc = mdesc;
920 machine_name = mdesc->name;
921
922 if (mdesc->soft_reboot)
923 reboot_setup("s");
924
925 init_mm.start_code = (unsigned long) _text;
926 init_mm.end_code = (unsigned long) _etext;
927 init_mm.end_data = (unsigned long) _edata;
928 init_mm.brk = (unsigned long) _end;
929
930 /* populate cmd_line too for later use, preserving boot_command_line */
931 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
932 *cmdline_p = cmd_line;
933
934 parse_early_param();
935
936 sanity_check_meminfo();
937 arm_memblock_init(&meminfo, mdesc);
938
939 paging_init(mdesc);
940 request_standard_resources(mdesc);
941
942 unflatten_device_tree();
943
944 #ifdef CONFIG_SMP
945 if (is_smp())
946 smp_init_cpus();
947 #endif
948 reserve_crashkernel();
949
950 tcm_init();
951
952 #ifdef CONFIG_ZONE_DMA
953 if (mdesc->dma_zone_size) {
954 extern unsigned long arm_dma_zone_size;
955 arm_dma_zone_size = mdesc->dma_zone_size;
956 }
957 #endif
958 #ifdef CONFIG_MULTI_IRQ_HANDLER
959 handle_arch_irq = mdesc->handle_irq;
960 #endif
961
962 #ifdef CONFIG_VT
963 #if defined(CONFIG_VGA_CONSOLE)
964 conswitchp = &vga_con;
965 #elif defined(CONFIG_DUMMY_CONSOLE)
966 conswitchp = &dummy_con;
967 #endif
968 #endif
969 early_trap_init();
970
971 if (mdesc->init_early)
972 mdesc->init_early();
973 }
974
975
976 static int __init topology_init(void)
977 {
978 int cpu;
979
980 for_each_possible_cpu(cpu) {
981 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
982 cpuinfo->cpu.hotpluggable = 1;
983 register_cpu(&cpuinfo->cpu, cpu);
984 }
985
986 return 0;
987 }
988 subsys_initcall(topology_init);
989
990 #ifdef CONFIG_HAVE_PROC_CPU
991 static int __init proc_cpu_init(void)
992 {
993 struct proc_dir_entry *res;
994
995 res = proc_mkdir("cpu", NULL);
996 if (!res)
997 return -ENOMEM;
998 return 0;
999 }
1000 fs_initcall(proc_cpu_init);
1001 #endif
1002
1003 static const char *hwcap_str[] = {
1004 "swp",
1005 "half",
1006 "thumb",
1007 "26bit",
1008 "fastmult",
1009 "fpa",
1010 "vfp",
1011 "edsp",
1012 "java",
1013 "iwmmxt",
1014 "crunch",
1015 "thumbee",
1016 "neon",
1017 "vfpv3",
1018 "vfpv3d16",
1019 "tls",
1020 "vfpv4",
1021 "idiva",
1022 "idivt",
1023 NULL
1024 };
1025
1026 static int c_show(struct seq_file *m, void *v)
1027 {
1028 int i;
1029
1030 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1031 cpu_name, read_cpuid_id() & 15, elf_platform);
1032
1033 #if defined(CONFIG_SMP)
1034 for_each_online_cpu(i) {
1035 /*
1036 * glibc reads /proc/cpuinfo to determine the number of
1037 * online processors, looking for lines beginning with
1038 * "processor". Give glibc what it expects.
1039 */
1040 seq_printf(m, "processor\t: %d\n", i);
1041 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1042 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1043 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1044 }
1045 #else /* CONFIG_SMP */
1046 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1047 loops_per_jiffy / (500000/HZ),
1048 (loops_per_jiffy / (5000/HZ)) % 100);
1049 #endif
1050
1051 /* dump out the processor features */
1052 seq_puts(m, "Features\t: ");
1053
1054 for (i = 0; hwcap_str[i]; i++)
1055 if (elf_hwcap & (1 << i))
1056 seq_printf(m, "%s ", hwcap_str[i]);
1057
1058 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1059 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1060
1061 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1062 /* pre-ARM7 */
1063 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1064 } else {
1065 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1066 /* ARM7 */
1067 seq_printf(m, "CPU variant\t: 0x%02x\n",
1068 (read_cpuid_id() >> 16) & 127);
1069 } else {
1070 /* post-ARM7 */
1071 seq_printf(m, "CPU variant\t: 0x%x\n",
1072 (read_cpuid_id() >> 20) & 15);
1073 }
1074 seq_printf(m, "CPU part\t: 0x%03x\n",
1075 (read_cpuid_id() >> 4) & 0xfff);
1076 }
1077 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1078
1079 seq_puts(m, "\n");
1080
1081 seq_printf(m, "Hardware\t: %s\n", machine_name);
1082 seq_printf(m, "Revision\t: %04x\n", system_rev);
1083 seq_printf(m, "Serial\t\t: %08x%08x\n",
1084 system_serial_high, system_serial_low);
1085
1086 return 0;
1087 }
1088
1089 static void *c_start(struct seq_file *m, loff_t *pos)
1090 {
1091 return *pos < 1 ? (void *)1 : NULL;
1092 }
1093
1094 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1095 {
1096 ++*pos;
1097 return NULL;
1098 }
1099
1100 static void c_stop(struct seq_file *m, void *v)
1101 {
1102 }
1103
1104 const struct seq_operations cpuinfo_op = {
1105 .start = c_start,
1106 .next = c_next,
1107 .stop = c_stop,
1108 .show = c_show
1109 };
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