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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
33#include <asm/unified.h>
34#include <asm/cpu.h>
35#include <asm/cputype.h>
36#include <asm/elf.h>
37#include <asm/procinfo.h>
38#include <asm/sections.h>
39#include <asm/setup.h>
40#include <asm/smp_plat.h>
41#include <asm/mach-types.h>
42#include <asm/cacheflush.h>
43#include <asm/cachetype.h>
44#include <asm/tlbflush.h>
45
46#include <asm/prom.h>
47#include <asm/mach/arch.h>
48#include <asm/mach/irq.h>
49#include <asm/mach/time.h>
50#include <asm/traps.h>
51#include <asm/unwind.h>
52
53#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
54#include "compat.h"
55#endif
56#include "atags.h"
57#include "tcm.h"
58
59#ifndef MEM_SIZE
60#define MEM_SIZE (16*1024*1024)
61#endif
62
63#if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
64char fpe_type[8];
65
66static int __init fpe_setup(char *line)
67{
68 memcpy(fpe_type, line, 8);
69 return 1;
70}
71
72__setup("fpe=", fpe_setup);
73#endif
74
75extern void paging_init(struct machine_desc *desc);
76extern void sanity_check_meminfo(void);
77extern void reboot_setup(char *str);
78
79unsigned int processor_id;
80EXPORT_SYMBOL(processor_id);
81unsigned int __machine_arch_type __read_mostly;
82EXPORT_SYMBOL(__machine_arch_type);
83unsigned int cacheid __read_mostly;
84EXPORT_SYMBOL(cacheid);
85
86unsigned int __atags_pointer __initdata;
87
88unsigned int system_rev;
89EXPORT_SYMBOL(system_rev);
90
91unsigned int system_serial_low;
92EXPORT_SYMBOL(system_serial_low);
93
94unsigned int system_serial_high;
95EXPORT_SYMBOL(system_serial_high);
96
97unsigned int elf_hwcap __read_mostly;
98EXPORT_SYMBOL(elf_hwcap);
99
100
101#ifdef MULTI_CPU
102struct processor processor __read_mostly;
103#endif
104#ifdef MULTI_TLB
105struct cpu_tlb_fns cpu_tlb __read_mostly;
106#endif
107#ifdef MULTI_USER
108struct cpu_user_fns cpu_user __read_mostly;
109#endif
110#ifdef MULTI_CACHE
111struct cpu_cache_fns cpu_cache __read_mostly;
112#endif
113#ifdef CONFIG_OUTER_CACHE
114struct outer_cache_fns outer_cache __read_mostly;
115EXPORT_SYMBOL(outer_cache);
116#endif
117
118struct stack {
119 u32 irq[3];
120 u32 abt[3];
121 u32 und[3];
122} ____cacheline_aligned;
123
124static struct stack stacks[NR_CPUS];
125
126char elf_platform[ELF_PLATFORM_SIZE];
127EXPORT_SYMBOL(elf_platform);
128
129static const char *cpu_name;
130static const char *machine_name;
131static char __initdata cmd_line[COMMAND_LINE_SIZE];
132struct machine_desc *machine_desc __initdata;
133
134static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
135static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
136#define ENDIANNESS ((char)endian_test.l)
137
138DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
139
140/*
141 * Standard memory resources
142 */
143static struct resource mem_res[] = {
144 {
145 .name = "Video RAM",
146 .start = 0,
147 .end = 0,
148 .flags = IORESOURCE_MEM
149 },
150 {
151 .name = "Kernel text",
152 .start = 0,
153 .end = 0,
154 .flags = IORESOURCE_MEM
155 },
156 {
157 .name = "Kernel data",
158 .start = 0,
159 .end = 0,
160 .flags = IORESOURCE_MEM
161 }
162};
163
164#define video_ram mem_res[0]
165#define kernel_code mem_res[1]
166#define kernel_data mem_res[2]
167
168static struct resource io_res[] = {
169 {
170 .name = "reserved",
171 .start = 0x3bc,
172 .end = 0x3be,
173 .flags = IORESOURCE_IO | IORESOURCE_BUSY
174 },
175 {
176 .name = "reserved",
177 .start = 0x378,
178 .end = 0x37f,
179 .flags = IORESOURCE_IO | IORESOURCE_BUSY
180 },
181 {
182 .name = "reserved",
183 .start = 0x278,
184 .end = 0x27f,
185 .flags = IORESOURCE_IO | IORESOURCE_BUSY
186 }
187};
188
189#define lp0 io_res[0]
190#define lp1 io_res[1]
191#define lp2 io_res[2]
192
193static const char *proc_arch[] = {
194 "undefined/unknown",
195 "3",
196 "4",
197 "4T",
198 "5",
199 "5T",
200 "5TE",
201 "5TEJ",
202 "6TEJ",
203 "7",
204 "?(11)",
205 "?(12)",
206 "?(13)",
207 "?(14)",
208 "?(15)",
209 "?(16)",
210 "?(17)",
211};
212
213int cpu_architecture(void)
214{
215 int cpu_arch;
216
217 if ((read_cpuid_id() & 0x0008f000) == 0) {
218 cpu_arch = CPU_ARCH_UNKNOWN;
219 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
220 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
221 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
222 cpu_arch = (read_cpuid_id() >> 16) & 7;
223 if (cpu_arch)
224 cpu_arch += CPU_ARCH_ARMv3;
225 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
226 unsigned int mmfr0;
227
228 /* Revised CPUID format. Read the Memory Model Feature
229 * Register 0 and check for VMSAv7 or PMSAv7 */
230 asm("mrc p15, 0, %0, c0, c1, 4"
231 : "=r" (mmfr0));
232 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
233 (mmfr0 & 0x000000f0) >= 0x00000030)
234 cpu_arch = CPU_ARCH_ARMv7;
235 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
236 (mmfr0 & 0x000000f0) == 0x00000020)
237 cpu_arch = CPU_ARCH_ARMv6;
238 else
239 cpu_arch = CPU_ARCH_UNKNOWN;
240 } else
241 cpu_arch = CPU_ARCH_UNKNOWN;
242
243 return cpu_arch;
244}
245
246static int cpu_has_aliasing_icache(unsigned int arch)
247{
248 int aliasing_icache;
249 unsigned int id_reg, num_sets, line_size;
250
251 /* arch specifies the register format */
252 switch (arch) {
253 case CPU_ARCH_ARMv7:
254 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
255 : /* No output operands */
256 : "r" (1));
257 isb();
258 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
259 : "=r" (id_reg));
260 line_size = 4 << ((id_reg & 0x7) + 2);
261 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
262 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
263 break;
264 case CPU_ARCH_ARMv6:
265 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
266 break;
267 default:
268 /* I-cache aliases will be handled by D-cache aliasing code */
269 aliasing_icache = 0;
270 }
271
272 return aliasing_icache;
273}
274
275static void __init cacheid_init(void)
276{
277 unsigned int cachetype = read_cpuid_cachetype();
278 unsigned int arch = cpu_architecture();
279
280 if (arch >= CPU_ARCH_ARMv6) {
281 if ((cachetype & (7 << 29)) == 4 << 29) {
282 /* ARMv7 register format */
283 arch = CPU_ARCH_ARMv7;
284 cacheid = CACHEID_VIPT_NONALIASING;
285 if ((cachetype & (3 << 14)) == 1 << 14)
286 cacheid |= CACHEID_ASID_TAGGED;
287 } else {
288 arch = CPU_ARCH_ARMv6;
289 if (cachetype & (1 << 23))
290 cacheid = CACHEID_VIPT_ALIASING;
291 else
292 cacheid = CACHEID_VIPT_NONALIASING;
293 }
294 if (cpu_has_aliasing_icache(arch))
295 cacheid |= CACHEID_VIPT_I_ALIASING;
296 } else {
297 cacheid = CACHEID_VIVT;
298 }
299
300 printk("CPU: %s data cache, %s instruction cache\n",
301 cache_is_vivt() ? "VIVT" :
302 cache_is_vipt_aliasing() ? "VIPT aliasing" :
303 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
304 cache_is_vivt() ? "VIVT" :
305 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
306 icache_is_vipt_aliasing() ? "VIPT aliasing" :
307 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
308}
309
310/*
311 * These functions re-use the assembly code in head.S, which
312 * already provide the required functionality.
313 */
314extern struct proc_info_list *lookup_processor_type(unsigned int);
315
316void __init early_print(const char *str, ...)
317{
318 extern void printascii(const char *);
319 char buf[256];
320 va_list ap;
321
322 va_start(ap, str);
323 vsnprintf(buf, sizeof(buf), str, ap);
324 va_end(ap);
325
326#ifdef CONFIG_DEBUG_LL
327 printascii(buf);
328#endif
329 printk("%s", buf);
330}
331
332static void __init feat_v6_fixup(void)
333{
334 int id = read_cpuid_id();
335
336 if ((id & 0xff0f0000) != 0x41070000)
337 return;
338
339 /*
340 * HWCAP_TLS is available only on 1136 r1p0 and later,
341 * see also kuser_get_tls_init.
342 */
343 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
344 elf_hwcap &= ~HWCAP_TLS;
345}
346
347/*
348 * cpu_init - initialise one CPU.
349 *
350 * cpu_init sets up the per-CPU stacks.
351 */
352void cpu_init(void)
353{
354 unsigned int cpu = smp_processor_id();
355 struct stack *stk = &stacks[cpu];
356
357 if (cpu >= NR_CPUS) {
358 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
359 BUG();
360 }
361
362 cpu_proc_init();
363
364 /*
365 * Define the placement constraint for the inline asm directive below.
366 * In Thumb-2, msr with an immediate value is not allowed.
367 */
368#ifdef CONFIG_THUMB2_KERNEL
369#define PLC "r"
370#else
371#define PLC "I"
372#endif
373
374 /*
375 * setup stacks for re-entrant exception handlers
376 */
377 __asm__ (
378 "msr cpsr_c, %1\n\t"
379 "add r14, %0, %2\n\t"
380 "mov sp, r14\n\t"
381 "msr cpsr_c, %3\n\t"
382 "add r14, %0, %4\n\t"
383 "mov sp, r14\n\t"
384 "msr cpsr_c, %5\n\t"
385 "add r14, %0, %6\n\t"
386 "mov sp, r14\n\t"
387 "msr cpsr_c, %7"
388 :
389 : "r" (stk),
390 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
391 "I" (offsetof(struct stack, irq[0])),
392 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
393 "I" (offsetof(struct stack, abt[0])),
394 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
395 "I" (offsetof(struct stack, und[0])),
396 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
397 : "r14");
398}
399
400static void __init setup_processor(void)
401{
402 struct proc_info_list *list;
403
404 /*
405 * locate processor in the list of supported processor
406 * types. The linker builds this table for us from the
407 * entries in arch/arm/mm/proc-*.S
408 */
409 list = lookup_processor_type(read_cpuid_id());
410 if (!list) {
411 printk("CPU configuration botched (ID %08x), unable "
412 "to continue.\n", read_cpuid_id());
413 while (1);
414 }
415
416 cpu_name = list->cpu_name;
417
418#ifdef MULTI_CPU
419 processor = *list->proc;
420#endif
421#ifdef MULTI_TLB
422 cpu_tlb = *list->tlb;
423#endif
424#ifdef MULTI_USER
425 cpu_user = *list->user;
426#endif
427#ifdef MULTI_CACHE
428 cpu_cache = *list->cache;
429#endif
430
431 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
432 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
433 proc_arch[cpu_architecture()], cr_alignment);
434
435 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
436 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
437 elf_hwcap = list->elf_hwcap;
438#ifndef CONFIG_ARM_THUMB
439 elf_hwcap &= ~HWCAP_THUMB;
440#endif
441
442 feat_v6_fixup();
443
444 cacheid_init();
445 cpu_init();
446}
447
448void __init dump_machine_table(void)
449{
450 struct machine_desc *p;
451
452 early_print("Available machine support:\n\nID (hex)\tNAME\n");
453 for_each_machine_desc(p)
454 early_print("%08x\t%s\n", p->nr, p->name);
455
456 early_print("\nPlease check your kernel config and/or bootloader.\n");
457
458 while (true)
459 /* can't use cpu_relax() here as it may require MMU setup */;
460}
461
462int __init arm_add_memory(phys_addr_t start, unsigned long size)
463{
464 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
465
466 if (meminfo.nr_banks >= NR_BANKS) {
467 printk(KERN_CRIT "NR_BANKS too low, "
468 "ignoring memory at 0x%08llx\n", (long long)start);
469 return -EINVAL;
470 }
471
472 /*
473 * Ensure that start/size are aligned to a page boundary.
474 * Size is appropriately rounded down, start is rounded up.
475 */
476 size -= start & ~PAGE_MASK;
477 bank->start = PAGE_ALIGN(start);
478 bank->size = size & PAGE_MASK;
479
480 /*
481 * Check whether this memory region has non-zero size or
482 * invalid node number.
483 */
484 if (bank->size == 0)
485 return -EINVAL;
486
487 meminfo.nr_banks++;
488 return 0;
489}
490
491/*
492 * Pick out the memory size. We look for mem=size@start,
493 * where start and size are "size[KkMm]"
494 */
495static int __init early_mem(char *p)
496{
497 static int usermem __initdata = 0;
498 unsigned long size;
499 phys_addr_t start;
500 char *endp;
501
502 /*
503 * If the user specifies memory size, we
504 * blow away any automatically generated
505 * size.
506 */
507 if (usermem == 0) {
508 usermem = 1;
509 meminfo.nr_banks = 0;
510 }
511
512 start = PHYS_OFFSET;
513 size = memparse(p, &endp);
514 if (*endp == '@')
515 start = memparse(endp + 1, NULL);
516
517 arm_add_memory(start, size);
518
519 return 0;
520}
521early_param("mem", early_mem);
522
523static void __init
524setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
525{
526#ifdef CONFIG_BLK_DEV_RAM
527 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
528
529 rd_image_start = image_start;
530 rd_prompt = prompt;
531 rd_doload = doload;
532
533 if (rd_sz)
534 rd_size = rd_sz;
535#endif
536}
537
538static void __init request_standard_resources(struct machine_desc *mdesc)
539{
540 struct memblock_region *region;
541 struct resource *res;
542
543 kernel_code.start = virt_to_phys(_text);
544 kernel_code.end = virt_to_phys(_etext - 1);
545 kernel_data.start = virt_to_phys(_sdata);
546 kernel_data.end = virt_to_phys(_end - 1);
547
548 for_each_memblock(memory, region) {
549 res = alloc_bootmem_low(sizeof(*res));
550 res->name = "System RAM";
551 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
552 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
553 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
554
555 request_resource(&iomem_resource, res);
556
557 if (kernel_code.start >= res->start &&
558 kernel_code.end <= res->end)
559 request_resource(res, &kernel_code);
560 if (kernel_data.start >= res->start &&
561 kernel_data.end <= res->end)
562 request_resource(res, &kernel_data);
563 }
564
565 if (mdesc->video_start) {
566 video_ram.start = mdesc->video_start;
567 video_ram.end = mdesc->video_end;
568 request_resource(&iomem_resource, &video_ram);
569 }
570
571 /*
572 * Some machines don't have the possibility of ever
573 * possessing lp0, lp1 or lp2
574 */
575 if (mdesc->reserve_lp0)
576 request_resource(&ioport_resource, &lp0);
577 if (mdesc->reserve_lp1)
578 request_resource(&ioport_resource, &lp1);
579 if (mdesc->reserve_lp2)
580 request_resource(&ioport_resource, &lp2);
581}
582
583/*
584 * Tag parsing.
585 *
586 * This is the new way of passing data to the kernel at boot time. Rather
587 * than passing a fixed inflexible structure to the kernel, we pass a list
588 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
589 * tag for the list to be recognised (to distinguish the tagged list from
590 * a param_struct). The list is terminated with a zero-length tag (this tag
591 * is not parsed in any way).
592 */
593static int __init parse_tag_core(const struct tag *tag)
594{
595 if (tag->hdr.size > 2) {
596 if ((tag->u.core.flags & 1) == 0)
597 root_mountflags &= ~MS_RDONLY;
598 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
599 }
600 return 0;
601}
602
603__tagtable(ATAG_CORE, parse_tag_core);
604
605static int __init parse_tag_mem32(const struct tag *tag)
606{
607 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
608}
609
610__tagtable(ATAG_MEM, parse_tag_mem32);
611
612#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
613struct screen_info screen_info = {
614 .orig_video_lines = 30,
615 .orig_video_cols = 80,
616 .orig_video_mode = 0,
617 .orig_video_ega_bx = 0,
618 .orig_video_isVGA = 1,
619 .orig_video_points = 8
620};
621
622static int __init parse_tag_videotext(const struct tag *tag)
623{
624 screen_info.orig_x = tag->u.videotext.x;
625 screen_info.orig_y = tag->u.videotext.y;
626 screen_info.orig_video_page = tag->u.videotext.video_page;
627 screen_info.orig_video_mode = tag->u.videotext.video_mode;
628 screen_info.orig_video_cols = tag->u.videotext.video_cols;
629 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
630 screen_info.orig_video_lines = tag->u.videotext.video_lines;
631 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
632 screen_info.orig_video_points = tag->u.videotext.video_points;
633 return 0;
634}
635
636__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
637#endif
638
639static int __init parse_tag_ramdisk(const struct tag *tag)
640{
641 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
642 (tag->u.ramdisk.flags & 2) == 0,
643 tag->u.ramdisk.start, tag->u.ramdisk.size);
644 return 0;
645}
646
647__tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
648
649static int __init parse_tag_serialnr(const struct tag *tag)
650{
651 system_serial_low = tag->u.serialnr.low;
652 system_serial_high = tag->u.serialnr.high;
653 return 0;
654}
655
656__tagtable(ATAG_SERIAL, parse_tag_serialnr);
657
658static int __init parse_tag_revision(const struct tag *tag)
659{
660 system_rev = tag->u.revision.rev;
661 return 0;
662}
663
664__tagtable(ATAG_REVISION, parse_tag_revision);
665
666static int __init parse_tag_cmdline(const struct tag *tag)
667{
668#if defined(CONFIG_CMDLINE_EXTEND)
669 strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
670 strlcat(default_command_line, tag->u.cmdline.cmdline,
671 COMMAND_LINE_SIZE);
672#elif defined(CONFIG_CMDLINE_FORCE)
673 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
674#else
675 strlcpy(default_command_line, tag->u.cmdline.cmdline,
676 COMMAND_LINE_SIZE);
677#endif
678 return 0;
679}
680
681__tagtable(ATAG_CMDLINE, parse_tag_cmdline);
682
683/*
684 * Scan the tag table for this tag, and call its parse function.
685 * The tag table is built by the linker from all the __tagtable
686 * declarations.
687 */
688static int __init parse_tag(const struct tag *tag)
689{
690 extern struct tagtable __tagtable_begin, __tagtable_end;
691 struct tagtable *t;
692
693 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
694 if (tag->hdr.tag == t->tag) {
695 t->parse(tag);
696 break;
697 }
698
699 return t < &__tagtable_end;
700}
701
702/*
703 * Parse all tags in the list, checking both the global and architecture
704 * specific tag tables.
705 */
706static void __init parse_tags(const struct tag *t)
707{
708 for (; t->hdr.size; t = tag_next(t))
709 if (!parse_tag(t))
710 printk(KERN_WARNING
711 "Ignoring unrecognised tag 0x%08x\n",
712 t->hdr.tag);
713}
714
715/*
716 * This holds our defaults.
717 */
718static struct init_tags {
719 struct tag_header hdr1;
720 struct tag_core core;
721 struct tag_header hdr2;
722 struct tag_mem32 mem;
723 struct tag_header hdr3;
724} init_tags __initdata = {
725 { tag_size(tag_core), ATAG_CORE },
726 { 1, PAGE_SIZE, 0xff },
727 { tag_size(tag_mem32), ATAG_MEM },
728 { MEM_SIZE },
729 { 0, ATAG_NONE }
730};
731
732static int __init customize_machine(void)
733{
734 /* customizes platform devices, or adds new ones */
735 if (machine_desc->init_machine)
736 machine_desc->init_machine();
737 return 0;
738}
739arch_initcall(customize_machine);
740
741#ifdef CONFIG_KEXEC
742static inline unsigned long long get_total_mem(void)
743{
744 unsigned long total;
745
746 total = max_low_pfn - min_low_pfn;
747 return total << PAGE_SHIFT;
748}
749
750/**
751 * reserve_crashkernel() - reserves memory are for crash kernel
752 *
753 * This function reserves memory area given in "crashkernel=" kernel command
754 * line parameter. The memory reserved is used by a dump capture kernel when
755 * primary kernel is crashing.
756 */
757static void __init reserve_crashkernel(void)
758{
759 unsigned long long crash_size, crash_base;
760 unsigned long long total_mem;
761 int ret;
762
763 total_mem = get_total_mem();
764 ret = parse_crashkernel(boot_command_line, total_mem,
765 &crash_size, &crash_base);
766 if (ret)
767 return;
768
769 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
770 if (ret < 0) {
771 printk(KERN_WARNING "crashkernel reservation failed - "
772 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
773 return;
774 }
775
776 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
777 "for crashkernel (System RAM: %ldMB)\n",
778 (unsigned long)(crash_size >> 20),
779 (unsigned long)(crash_base >> 20),
780 (unsigned long)(total_mem >> 20));
781
782 crashk_res.start = crash_base;
783 crashk_res.end = crash_base + crash_size - 1;
784 insert_resource(&iomem_resource, &crashk_res);
785}
786#else
787static inline void reserve_crashkernel(void) {}
788#endif /* CONFIG_KEXEC */
789
790static void __init squash_mem_tags(struct tag *tag)
791{
792 for (; tag->hdr.size; tag = tag_next(tag))
793 if (tag->hdr.tag == ATAG_MEM)
794 tag->hdr.tag = ATAG_NONE;
795}
796
797static struct machine_desc * __init setup_machine_tags(unsigned int nr)
798{
799 struct tag *tags = (struct tag *)&init_tags;
800 struct machine_desc *mdesc = NULL, *p;
801 char *from = default_command_line;
802
803 init_tags.mem.start = PHYS_OFFSET;
804
805 /*
806 * locate machine in the list of supported machines.
807 */
808 for_each_machine_desc(p)
809 if (nr == p->nr) {
810 printk("Machine: %s\n", p->name);
811 mdesc = p;
812 break;
813 }
814
815 if (!mdesc) {
816 early_print("\nError: unrecognized/unsupported machine ID"
817 " (r1 = 0x%08x).\n\n", nr);
818 dump_machine_table(); /* does not return */
819 }
820
821 if (__atags_pointer)
822 tags = phys_to_virt(__atags_pointer);
823 else if (mdesc->boot_params) {
824#ifdef CONFIG_MMU
825 /*
826 * We still are executing with a minimal MMU mapping created
827 * with the presumption that the machine default for this
828 * is located in the first MB of RAM. Anything else will
829 * fault and silently hang the kernel at this point.
830 */
831 if (mdesc->boot_params < PHYS_OFFSET ||
832 mdesc->boot_params >= PHYS_OFFSET + SZ_1M) {
833 printk(KERN_WARNING
834 "Default boot params at physical 0x%08lx out of reach\n",
835 mdesc->boot_params);
836 } else
837#endif
838 {
839 tags = phys_to_virt(mdesc->boot_params);
840 }
841 }
842
843#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
844 /*
845 * If we have the old style parameters, convert them to
846 * a tag list.
847 */
848 if (tags->hdr.tag != ATAG_CORE)
849 convert_to_tag_list(tags);
850#endif
851
852 if (tags->hdr.tag != ATAG_CORE) {
853#if defined(CONFIG_OF)
854 /*
855 * If CONFIG_OF is set, then assume this is a reasonably
856 * modern system that should pass boot parameters
857 */
858 early_print("Warning: Neither atags nor dtb found\n");
859#endif
860 tags = (struct tag *)&init_tags;
861 }
862
863 if (mdesc->fixup)
864 mdesc->fixup(mdesc, tags, &from, &meminfo);
865
866 if (tags->hdr.tag == ATAG_CORE) {
867 if (meminfo.nr_banks != 0)
868 squash_mem_tags(tags);
869 save_atags(tags);
870 parse_tags(tags);
871 }
872
873 /* parse_early_param needs a boot_command_line */
874 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
875
876 return mdesc;
877}
878
879
880void __init setup_arch(char **cmdline_p)
881{
882 struct machine_desc *mdesc;
883
884 unwind_init();
885
886 setup_processor();
887 mdesc = setup_machine_fdt(__atags_pointer);
888 if (!mdesc)
889 mdesc = setup_machine_tags(machine_arch_type);
890 machine_desc = mdesc;
891 machine_name = mdesc->name;
892
893 if (mdesc->soft_reboot)
894 reboot_setup("s");
895
896 init_mm.start_code = (unsigned long) _text;
897 init_mm.end_code = (unsigned long) _etext;
898 init_mm.end_data = (unsigned long) _edata;
899 init_mm.brk = (unsigned long) _end;
900
901 /* populate cmd_line too for later use, preserving boot_command_line */
902 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
903 *cmdline_p = cmd_line;
904
905 parse_early_param();
906
907 sanity_check_meminfo();
908 arm_memblock_init(&meminfo, mdesc);
909
910 paging_init(mdesc);
911 request_standard_resources(mdesc);
912
913 unflatten_device_tree();
914
915#ifdef CONFIG_SMP
916 if (is_smp())
917 smp_init_cpus();
918#endif
919 reserve_crashkernel();
920
921 tcm_init();
922
923#ifdef CONFIG_ZONE_DMA
924 if (mdesc->dma_zone_size) {
925 extern unsigned long arm_dma_zone_size;
926 arm_dma_zone_size = mdesc->dma_zone_size;
927 }
928#endif
929#ifdef CONFIG_MULTI_IRQ_HANDLER
930 handle_arch_irq = mdesc->handle_irq;
931#endif
932
933#ifdef CONFIG_VT
934#if defined(CONFIG_VGA_CONSOLE)
935 conswitchp = &vga_con;
936#elif defined(CONFIG_DUMMY_CONSOLE)
937 conswitchp = &dummy_con;
938#endif
939#endif
940 early_trap_init();
941
942 if (mdesc->init_early)
943 mdesc->init_early();
944}
945
946
947static int __init topology_init(void)
948{
949 int cpu;
950
951 for_each_possible_cpu(cpu) {
952 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
953 cpuinfo->cpu.hotpluggable = 1;
954 register_cpu(&cpuinfo->cpu, cpu);
955 }
956
957 return 0;
958}
959subsys_initcall(topology_init);
960
961#ifdef CONFIG_HAVE_PROC_CPU
962static int __init proc_cpu_init(void)
963{
964 struct proc_dir_entry *res;
965
966 res = proc_mkdir("cpu", NULL);
967 if (!res)
968 return -ENOMEM;
969 return 0;
970}
971fs_initcall(proc_cpu_init);
972#endif
973
974static const char *hwcap_str[] = {
975 "swp",
976 "half",
977 "thumb",
978 "26bit",
979 "fastmult",
980 "fpa",
981 "vfp",
982 "edsp",
983 "java",
984 "iwmmxt",
985 "crunch",
986 "thumbee",
987 "neon",
988 "vfpv3",
989 "vfpv3d16",
990 "tls",
991 "vfpv4",
992 "idiva",
993 "idivt",
994 NULL
995};
996
997static int c_show(struct seq_file *m, void *v)
998{
999 int i;
1000
1001 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1002 cpu_name, read_cpuid_id() & 15, elf_platform);
1003
1004#if defined(CONFIG_SMP)
1005 for_each_online_cpu(i) {
1006 /*
1007 * glibc reads /proc/cpuinfo to determine the number of
1008 * online processors, looking for lines beginning with
1009 * "processor". Give glibc what it expects.
1010 */
1011 seq_printf(m, "processor\t: %d\n", i);
1012 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1013 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1014 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1015 }
1016#else /* CONFIG_SMP */
1017 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1018 loops_per_jiffy / (500000/HZ),
1019 (loops_per_jiffy / (5000/HZ)) % 100);
1020#endif
1021
1022 /* dump out the processor features */
1023 seq_puts(m, "Features\t: ");
1024
1025 for (i = 0; hwcap_str[i]; i++)
1026 if (elf_hwcap & (1 << i))
1027 seq_printf(m, "%s ", hwcap_str[i]);
1028
1029 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1030 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1031
1032 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1033 /* pre-ARM7 */
1034 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1035 } else {
1036 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1037 /* ARM7 */
1038 seq_printf(m, "CPU variant\t: 0x%02x\n",
1039 (read_cpuid_id() >> 16) & 127);
1040 } else {
1041 /* post-ARM7 */
1042 seq_printf(m, "CPU variant\t: 0x%x\n",
1043 (read_cpuid_id() >> 20) & 15);
1044 }
1045 seq_printf(m, "CPU part\t: 0x%03x\n",
1046 (read_cpuid_id() >> 4) & 0xfff);
1047 }
1048 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1049
1050 seq_puts(m, "\n");
1051
1052 seq_printf(m, "Hardware\t: %s\n", machine_name);
1053 seq_printf(m, "Revision\t: %04x\n", system_rev);
1054 seq_printf(m, "Serial\t\t: %08x%08x\n",
1055 system_serial_high, system_serial_low);
1056
1057 return 0;
1058}
1059
1060static void *c_start(struct seq_file *m, loff_t *pos)
1061{
1062 return *pos < 1 ? (void *)1 : NULL;
1063}
1064
1065static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1066{
1067 ++*pos;
1068 return NULL;
1069}
1070
1071static void c_stop(struct seq_file *m, void *v)
1072{
1073}
1074
1075const struct seq_operations cpuinfo_op = {
1076 .start = c_start,
1077 .next = c_next,
1078 .stop = c_stop,
1079 .show = c_show
1080};
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/export.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/root_dev.h>
25#include <linux/cpu.h>
26#include <linux/interrupt.h>
27#include <linux/smp.h>
28#include <linux/fs.h>
29#include <linux/proc_fs.h>
30#include <linux/memblock.h>
31#include <linux/bug.h>
32#include <linux/compiler.h>
33#include <linux/sort.h>
34
35#include <asm/unified.h>
36#include <asm/cp15.h>
37#include <asm/cpu.h>
38#include <asm/cputype.h>
39#include <asm/elf.h>
40#include <asm/procinfo.h>
41#include <asm/sections.h>
42#include <asm/setup.h>
43#include <asm/smp_plat.h>
44#include <asm/mach-types.h>
45#include <asm/cacheflush.h>
46#include <asm/cachetype.h>
47#include <asm/tlbflush.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/system_info.h>
54#include <asm/system_misc.h>
55#include <asm/traps.h>
56#include <asm/unwind.h>
57#include <asm/memblock.h>
58
59#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
60#include "compat.h"
61#endif
62#include "atags.h"
63#include "tcm.h"
64
65#ifndef MEM_SIZE
66#define MEM_SIZE (16*1024*1024)
67#endif
68
69#if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
70char fpe_type[8];
71
72static int __init fpe_setup(char *line)
73{
74 memcpy(fpe_type, line, 8);
75 return 1;
76}
77
78__setup("fpe=", fpe_setup);
79#endif
80
81extern void paging_init(struct machine_desc *desc);
82extern void sanity_check_meminfo(void);
83extern void reboot_setup(char *str);
84extern void setup_dma_zone(struct machine_desc *desc);
85
86unsigned int processor_id;
87EXPORT_SYMBOL(processor_id);
88unsigned int __machine_arch_type __read_mostly;
89EXPORT_SYMBOL(__machine_arch_type);
90unsigned int cacheid __read_mostly;
91EXPORT_SYMBOL(cacheid);
92
93unsigned int __atags_pointer __initdata;
94
95unsigned int system_rev;
96EXPORT_SYMBOL(system_rev);
97
98unsigned int system_serial_low;
99EXPORT_SYMBOL(system_serial_low);
100
101unsigned int system_serial_high;
102EXPORT_SYMBOL(system_serial_high);
103
104unsigned int elf_hwcap __read_mostly;
105EXPORT_SYMBOL(elf_hwcap);
106
107
108#ifdef MULTI_CPU
109struct processor processor __read_mostly;
110#endif
111#ifdef MULTI_TLB
112struct cpu_tlb_fns cpu_tlb __read_mostly;
113#endif
114#ifdef MULTI_USER
115struct cpu_user_fns cpu_user __read_mostly;
116#endif
117#ifdef MULTI_CACHE
118struct cpu_cache_fns cpu_cache __read_mostly;
119#endif
120#ifdef CONFIG_OUTER_CACHE
121struct outer_cache_fns outer_cache __read_mostly;
122EXPORT_SYMBOL(outer_cache);
123#endif
124
125/*
126 * Cached cpu_architecture() result for use by assembler code.
127 * C code should use the cpu_architecture() function instead of accessing this
128 * variable directly.
129 */
130int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
131
132struct stack {
133 u32 irq[3];
134 u32 abt[3];
135 u32 und[3];
136} ____cacheline_aligned;
137
138static struct stack stacks[NR_CPUS];
139
140char elf_platform[ELF_PLATFORM_SIZE];
141EXPORT_SYMBOL(elf_platform);
142
143static const char *cpu_name;
144static const char *machine_name;
145static char __initdata cmd_line[COMMAND_LINE_SIZE];
146struct machine_desc *machine_desc __initdata;
147
148static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
149static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
150#define ENDIANNESS ((char)endian_test.l)
151
152DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
153
154/*
155 * Standard memory resources
156 */
157static struct resource mem_res[] = {
158 {
159 .name = "Video RAM",
160 .start = 0,
161 .end = 0,
162 .flags = IORESOURCE_MEM
163 },
164 {
165 .name = "Kernel code",
166 .start = 0,
167 .end = 0,
168 .flags = IORESOURCE_MEM
169 },
170 {
171 .name = "Kernel data",
172 .start = 0,
173 .end = 0,
174 .flags = IORESOURCE_MEM
175 }
176};
177
178#define video_ram mem_res[0]
179#define kernel_code mem_res[1]
180#define kernel_data mem_res[2]
181
182static struct resource io_res[] = {
183 {
184 .name = "reserved",
185 .start = 0x3bc,
186 .end = 0x3be,
187 .flags = IORESOURCE_IO | IORESOURCE_BUSY
188 },
189 {
190 .name = "reserved",
191 .start = 0x378,
192 .end = 0x37f,
193 .flags = IORESOURCE_IO | IORESOURCE_BUSY
194 },
195 {
196 .name = "reserved",
197 .start = 0x278,
198 .end = 0x27f,
199 .flags = IORESOURCE_IO | IORESOURCE_BUSY
200 }
201};
202
203#define lp0 io_res[0]
204#define lp1 io_res[1]
205#define lp2 io_res[2]
206
207static const char *proc_arch[] = {
208 "undefined/unknown",
209 "3",
210 "4",
211 "4T",
212 "5",
213 "5T",
214 "5TE",
215 "5TEJ",
216 "6TEJ",
217 "7",
218 "?(11)",
219 "?(12)",
220 "?(13)",
221 "?(14)",
222 "?(15)",
223 "?(16)",
224 "?(17)",
225};
226
227static int __get_cpu_architecture(void)
228{
229 int cpu_arch;
230
231 if ((read_cpuid_id() & 0x0008f000) == 0) {
232 cpu_arch = CPU_ARCH_UNKNOWN;
233 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
234 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
235 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
236 cpu_arch = (read_cpuid_id() >> 16) & 7;
237 if (cpu_arch)
238 cpu_arch += CPU_ARCH_ARMv3;
239 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
240 unsigned int mmfr0;
241
242 /* Revised CPUID format. Read the Memory Model Feature
243 * Register 0 and check for VMSAv7 or PMSAv7 */
244 asm("mrc p15, 0, %0, c0, c1, 4"
245 : "=r" (mmfr0));
246 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
247 (mmfr0 & 0x000000f0) >= 0x00000030)
248 cpu_arch = CPU_ARCH_ARMv7;
249 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
250 (mmfr0 & 0x000000f0) == 0x00000020)
251 cpu_arch = CPU_ARCH_ARMv6;
252 else
253 cpu_arch = CPU_ARCH_UNKNOWN;
254 } else
255 cpu_arch = CPU_ARCH_UNKNOWN;
256
257 return cpu_arch;
258}
259
260int __pure cpu_architecture(void)
261{
262 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
263
264 return __cpu_architecture;
265}
266
267static int cpu_has_aliasing_icache(unsigned int arch)
268{
269 int aliasing_icache;
270 unsigned int id_reg, num_sets, line_size;
271
272 /* PIPT caches never alias. */
273 if (icache_is_pipt())
274 return 0;
275
276 /* arch specifies the register format */
277 switch (arch) {
278 case CPU_ARCH_ARMv7:
279 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
280 : /* No output operands */
281 : "r" (1));
282 isb();
283 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
284 : "=r" (id_reg));
285 line_size = 4 << ((id_reg & 0x7) + 2);
286 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
287 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
288 break;
289 case CPU_ARCH_ARMv6:
290 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
291 break;
292 default:
293 /* I-cache aliases will be handled by D-cache aliasing code */
294 aliasing_icache = 0;
295 }
296
297 return aliasing_icache;
298}
299
300static void __init cacheid_init(void)
301{
302 unsigned int cachetype = read_cpuid_cachetype();
303 unsigned int arch = cpu_architecture();
304
305 if (arch >= CPU_ARCH_ARMv6) {
306 if ((cachetype & (7 << 29)) == 4 << 29) {
307 /* ARMv7 register format */
308 arch = CPU_ARCH_ARMv7;
309 cacheid = CACHEID_VIPT_NONALIASING;
310 switch (cachetype & (3 << 14)) {
311 case (1 << 14):
312 cacheid |= CACHEID_ASID_TAGGED;
313 break;
314 case (3 << 14):
315 cacheid |= CACHEID_PIPT;
316 break;
317 }
318 } else {
319 arch = CPU_ARCH_ARMv6;
320 if (cachetype & (1 << 23))
321 cacheid = CACHEID_VIPT_ALIASING;
322 else
323 cacheid = CACHEID_VIPT_NONALIASING;
324 }
325 if (cpu_has_aliasing_icache(arch))
326 cacheid |= CACHEID_VIPT_I_ALIASING;
327 } else {
328 cacheid = CACHEID_VIVT;
329 }
330
331 printk("CPU: %s data cache, %s instruction cache\n",
332 cache_is_vivt() ? "VIVT" :
333 cache_is_vipt_aliasing() ? "VIPT aliasing" :
334 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
335 cache_is_vivt() ? "VIVT" :
336 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
337 icache_is_vipt_aliasing() ? "VIPT aliasing" :
338 icache_is_pipt() ? "PIPT" :
339 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
340}
341
342/*
343 * These functions re-use the assembly code in head.S, which
344 * already provide the required functionality.
345 */
346extern struct proc_info_list *lookup_processor_type(unsigned int);
347
348void __init early_print(const char *str, ...)
349{
350 extern void printascii(const char *);
351 char buf[256];
352 va_list ap;
353
354 va_start(ap, str);
355 vsnprintf(buf, sizeof(buf), str, ap);
356 va_end(ap);
357
358#ifdef CONFIG_DEBUG_LL
359 printascii(buf);
360#endif
361 printk("%s", buf);
362}
363
364static void __init feat_v6_fixup(void)
365{
366 int id = read_cpuid_id();
367
368 if ((id & 0xff0f0000) != 0x41070000)
369 return;
370
371 /*
372 * HWCAP_TLS is available only on 1136 r1p0 and later,
373 * see also kuser_get_tls_init.
374 */
375 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
376 elf_hwcap &= ~HWCAP_TLS;
377}
378
379/*
380 * cpu_init - initialise one CPU.
381 *
382 * cpu_init sets up the per-CPU stacks.
383 */
384void cpu_init(void)
385{
386 unsigned int cpu = smp_processor_id();
387 struct stack *stk = &stacks[cpu];
388
389 if (cpu >= NR_CPUS) {
390 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
391 BUG();
392 }
393
394 cpu_proc_init();
395
396 /*
397 * Define the placement constraint for the inline asm directive below.
398 * In Thumb-2, msr with an immediate value is not allowed.
399 */
400#ifdef CONFIG_THUMB2_KERNEL
401#define PLC "r"
402#else
403#define PLC "I"
404#endif
405
406 /*
407 * setup stacks for re-entrant exception handlers
408 */
409 __asm__ (
410 "msr cpsr_c, %1\n\t"
411 "add r14, %0, %2\n\t"
412 "mov sp, r14\n\t"
413 "msr cpsr_c, %3\n\t"
414 "add r14, %0, %4\n\t"
415 "mov sp, r14\n\t"
416 "msr cpsr_c, %5\n\t"
417 "add r14, %0, %6\n\t"
418 "mov sp, r14\n\t"
419 "msr cpsr_c, %7"
420 :
421 : "r" (stk),
422 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
423 "I" (offsetof(struct stack, irq[0])),
424 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
425 "I" (offsetof(struct stack, abt[0])),
426 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
427 "I" (offsetof(struct stack, und[0])),
428 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
429 : "r14");
430}
431
432int __cpu_logical_map[NR_CPUS];
433
434void __init smp_setup_processor_id(void)
435{
436 int i;
437 u32 cpu = is_smp() ? read_cpuid_mpidr() & 0xff : 0;
438
439 cpu_logical_map(0) = cpu;
440 for (i = 1; i < NR_CPUS; ++i)
441 cpu_logical_map(i) = i == cpu ? 0 : i;
442
443 printk(KERN_INFO "Booting Linux on physical CPU %d\n", cpu);
444}
445
446static void __init setup_processor(void)
447{
448 struct proc_info_list *list;
449
450 /*
451 * locate processor in the list of supported processor
452 * types. The linker builds this table for us from the
453 * entries in arch/arm/mm/proc-*.S
454 */
455 list = lookup_processor_type(read_cpuid_id());
456 if (!list) {
457 printk("CPU configuration botched (ID %08x), unable "
458 "to continue.\n", read_cpuid_id());
459 while (1);
460 }
461
462 cpu_name = list->cpu_name;
463 __cpu_architecture = __get_cpu_architecture();
464
465#ifdef MULTI_CPU
466 processor = *list->proc;
467#endif
468#ifdef MULTI_TLB
469 cpu_tlb = *list->tlb;
470#endif
471#ifdef MULTI_USER
472 cpu_user = *list->user;
473#endif
474#ifdef MULTI_CACHE
475 cpu_cache = *list->cache;
476#endif
477
478 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
479 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
480 proc_arch[cpu_architecture()], cr_alignment);
481
482 snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c",
483 list->arch_name, ENDIANNESS);
484 snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c",
485 list->elf_name, ENDIANNESS);
486 elf_hwcap = list->elf_hwcap;
487#ifndef CONFIG_ARM_THUMB
488 elf_hwcap &= ~HWCAP_THUMB;
489#endif
490
491 feat_v6_fixup();
492
493 cacheid_init();
494 cpu_init();
495}
496
497void __init dump_machine_table(void)
498{
499 struct machine_desc *p;
500
501 early_print("Available machine support:\n\nID (hex)\tNAME\n");
502 for_each_machine_desc(p)
503 early_print("%08x\t%s\n", p->nr, p->name);
504
505 early_print("\nPlease check your kernel config and/or bootloader.\n");
506
507 while (true)
508 /* can't use cpu_relax() here as it may require MMU setup */;
509}
510
511int __init arm_add_memory(phys_addr_t start, unsigned long size)
512{
513 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
514
515 if (meminfo.nr_banks >= NR_BANKS) {
516 printk(KERN_CRIT "NR_BANKS too low, "
517 "ignoring memory at 0x%08llx\n", (long long)start);
518 return -EINVAL;
519 }
520
521 /*
522 * Ensure that start/size are aligned to a page boundary.
523 * Size is appropriately rounded down, start is rounded up.
524 */
525 size -= start & ~PAGE_MASK;
526 bank->start = PAGE_ALIGN(start);
527
528#ifndef CONFIG_LPAE
529 if (bank->start + size < bank->start) {
530 printk(KERN_CRIT "Truncating memory at 0x%08llx to fit in "
531 "32-bit physical address space\n", (long long)start);
532 /*
533 * To ensure bank->start + bank->size is representable in
534 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB.
535 * This means we lose a page after masking.
536 */
537 size = ULONG_MAX - bank->start;
538 }
539#endif
540
541 bank->size = size & PAGE_MASK;
542
543 /*
544 * Check whether this memory region has non-zero size or
545 * invalid node number.
546 */
547 if (bank->size == 0)
548 return -EINVAL;
549
550 meminfo.nr_banks++;
551 return 0;
552}
553
554/*
555 * Pick out the memory size. We look for mem=size@start,
556 * where start and size are "size[KkMm]"
557 */
558static int __init early_mem(char *p)
559{
560 static int usermem __initdata = 0;
561 unsigned long size;
562 phys_addr_t start;
563 char *endp;
564
565 /*
566 * If the user specifies memory size, we
567 * blow away any automatically generated
568 * size.
569 */
570 if (usermem == 0) {
571 usermem = 1;
572 meminfo.nr_banks = 0;
573 }
574
575 start = PHYS_OFFSET;
576 size = memparse(p, &endp);
577 if (*endp == '@')
578 start = memparse(endp + 1, NULL);
579
580 arm_add_memory(start, size);
581
582 return 0;
583}
584early_param("mem", early_mem);
585
586static void __init
587setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
588{
589#ifdef CONFIG_BLK_DEV_RAM
590 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
591
592 rd_image_start = image_start;
593 rd_prompt = prompt;
594 rd_doload = doload;
595
596 if (rd_sz)
597 rd_size = rd_sz;
598#endif
599}
600
601static void __init request_standard_resources(struct machine_desc *mdesc)
602{
603 struct memblock_region *region;
604 struct resource *res;
605
606 kernel_code.start = virt_to_phys(_text);
607 kernel_code.end = virt_to_phys(_etext - 1);
608 kernel_data.start = virt_to_phys(_sdata);
609 kernel_data.end = virt_to_phys(_end - 1);
610
611 for_each_memblock(memory, region) {
612 res = alloc_bootmem_low(sizeof(*res));
613 res->name = "System RAM";
614 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
615 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
616 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
617
618 request_resource(&iomem_resource, res);
619
620 if (kernel_code.start >= res->start &&
621 kernel_code.end <= res->end)
622 request_resource(res, &kernel_code);
623 if (kernel_data.start >= res->start &&
624 kernel_data.end <= res->end)
625 request_resource(res, &kernel_data);
626 }
627
628 if (mdesc->video_start) {
629 video_ram.start = mdesc->video_start;
630 video_ram.end = mdesc->video_end;
631 request_resource(&iomem_resource, &video_ram);
632 }
633
634 /*
635 * Some machines don't have the possibility of ever
636 * possessing lp0, lp1 or lp2
637 */
638 if (mdesc->reserve_lp0)
639 request_resource(&ioport_resource, &lp0);
640 if (mdesc->reserve_lp1)
641 request_resource(&ioport_resource, &lp1);
642 if (mdesc->reserve_lp2)
643 request_resource(&ioport_resource, &lp2);
644}
645
646/*
647 * Tag parsing.
648 *
649 * This is the new way of passing data to the kernel at boot time. Rather
650 * than passing a fixed inflexible structure to the kernel, we pass a list
651 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
652 * tag for the list to be recognised (to distinguish the tagged list from
653 * a param_struct). The list is terminated with a zero-length tag (this tag
654 * is not parsed in any way).
655 */
656static int __init parse_tag_core(const struct tag *tag)
657{
658 if (tag->hdr.size > 2) {
659 if ((tag->u.core.flags & 1) == 0)
660 root_mountflags &= ~MS_RDONLY;
661 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
662 }
663 return 0;
664}
665
666__tagtable(ATAG_CORE, parse_tag_core);
667
668static int __init parse_tag_mem32(const struct tag *tag)
669{
670 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
671}
672
673__tagtable(ATAG_MEM, parse_tag_mem32);
674
675#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
676struct screen_info screen_info = {
677 .orig_video_lines = 30,
678 .orig_video_cols = 80,
679 .orig_video_mode = 0,
680 .orig_video_ega_bx = 0,
681 .orig_video_isVGA = 1,
682 .orig_video_points = 8
683};
684
685static int __init parse_tag_videotext(const struct tag *tag)
686{
687 screen_info.orig_x = tag->u.videotext.x;
688 screen_info.orig_y = tag->u.videotext.y;
689 screen_info.orig_video_page = tag->u.videotext.video_page;
690 screen_info.orig_video_mode = tag->u.videotext.video_mode;
691 screen_info.orig_video_cols = tag->u.videotext.video_cols;
692 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
693 screen_info.orig_video_lines = tag->u.videotext.video_lines;
694 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
695 screen_info.orig_video_points = tag->u.videotext.video_points;
696 return 0;
697}
698
699__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
700#endif
701
702static int __init parse_tag_ramdisk(const struct tag *tag)
703{
704 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
705 (tag->u.ramdisk.flags & 2) == 0,
706 tag->u.ramdisk.start, tag->u.ramdisk.size);
707 return 0;
708}
709
710__tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
711
712static int __init parse_tag_serialnr(const struct tag *tag)
713{
714 system_serial_low = tag->u.serialnr.low;
715 system_serial_high = tag->u.serialnr.high;
716 return 0;
717}
718
719__tagtable(ATAG_SERIAL, parse_tag_serialnr);
720
721static int __init parse_tag_revision(const struct tag *tag)
722{
723 system_rev = tag->u.revision.rev;
724 return 0;
725}
726
727__tagtable(ATAG_REVISION, parse_tag_revision);
728
729static int __init parse_tag_cmdline(const struct tag *tag)
730{
731#if defined(CONFIG_CMDLINE_EXTEND)
732 strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
733 strlcat(default_command_line, tag->u.cmdline.cmdline,
734 COMMAND_LINE_SIZE);
735#elif defined(CONFIG_CMDLINE_FORCE)
736 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
737#else
738 strlcpy(default_command_line, tag->u.cmdline.cmdline,
739 COMMAND_LINE_SIZE);
740#endif
741 return 0;
742}
743
744__tagtable(ATAG_CMDLINE, parse_tag_cmdline);
745
746/*
747 * Scan the tag table for this tag, and call its parse function.
748 * The tag table is built by the linker from all the __tagtable
749 * declarations.
750 */
751static int __init parse_tag(const struct tag *tag)
752{
753 extern struct tagtable __tagtable_begin, __tagtable_end;
754 struct tagtable *t;
755
756 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
757 if (tag->hdr.tag == t->tag) {
758 t->parse(tag);
759 break;
760 }
761
762 return t < &__tagtable_end;
763}
764
765/*
766 * Parse all tags in the list, checking both the global and architecture
767 * specific tag tables.
768 */
769static void __init parse_tags(const struct tag *t)
770{
771 for (; t->hdr.size; t = tag_next(t))
772 if (!parse_tag(t))
773 printk(KERN_WARNING
774 "Ignoring unrecognised tag 0x%08x\n",
775 t->hdr.tag);
776}
777
778/*
779 * This holds our defaults.
780 */
781static struct init_tags {
782 struct tag_header hdr1;
783 struct tag_core core;
784 struct tag_header hdr2;
785 struct tag_mem32 mem;
786 struct tag_header hdr3;
787} init_tags __initdata = {
788 { tag_size(tag_core), ATAG_CORE },
789 { 1, PAGE_SIZE, 0xff },
790 { tag_size(tag_mem32), ATAG_MEM },
791 { MEM_SIZE },
792 { 0, ATAG_NONE }
793};
794
795static int __init customize_machine(void)
796{
797 /* customizes platform devices, or adds new ones */
798 if (machine_desc->init_machine)
799 machine_desc->init_machine();
800 return 0;
801}
802arch_initcall(customize_machine);
803
804static int __init init_machine_late(void)
805{
806 if (machine_desc->init_late)
807 machine_desc->init_late();
808 return 0;
809}
810late_initcall(init_machine_late);
811
812#ifdef CONFIG_KEXEC
813static inline unsigned long long get_total_mem(void)
814{
815 unsigned long total;
816
817 total = max_low_pfn - min_low_pfn;
818 return total << PAGE_SHIFT;
819}
820
821/**
822 * reserve_crashkernel() - reserves memory are for crash kernel
823 *
824 * This function reserves memory area given in "crashkernel=" kernel command
825 * line parameter. The memory reserved is used by a dump capture kernel when
826 * primary kernel is crashing.
827 */
828static void __init reserve_crashkernel(void)
829{
830 unsigned long long crash_size, crash_base;
831 unsigned long long total_mem;
832 int ret;
833
834 total_mem = get_total_mem();
835 ret = parse_crashkernel(boot_command_line, total_mem,
836 &crash_size, &crash_base);
837 if (ret)
838 return;
839
840 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
841 if (ret < 0) {
842 printk(KERN_WARNING "crashkernel reservation failed - "
843 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
844 return;
845 }
846
847 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
848 "for crashkernel (System RAM: %ldMB)\n",
849 (unsigned long)(crash_size >> 20),
850 (unsigned long)(crash_base >> 20),
851 (unsigned long)(total_mem >> 20));
852
853 crashk_res.start = crash_base;
854 crashk_res.end = crash_base + crash_size - 1;
855 insert_resource(&iomem_resource, &crashk_res);
856}
857#else
858static inline void reserve_crashkernel(void) {}
859#endif /* CONFIG_KEXEC */
860
861static void __init squash_mem_tags(struct tag *tag)
862{
863 for (; tag->hdr.size; tag = tag_next(tag))
864 if (tag->hdr.tag == ATAG_MEM)
865 tag->hdr.tag = ATAG_NONE;
866}
867
868static struct machine_desc * __init setup_machine_tags(unsigned int nr)
869{
870 struct tag *tags = (struct tag *)&init_tags;
871 struct machine_desc *mdesc = NULL, *p;
872 char *from = default_command_line;
873
874 init_tags.mem.start = PHYS_OFFSET;
875
876 /*
877 * locate machine in the list of supported machines.
878 */
879 for_each_machine_desc(p)
880 if (nr == p->nr) {
881 printk("Machine: %s\n", p->name);
882 mdesc = p;
883 break;
884 }
885
886 if (!mdesc) {
887 early_print("\nError: unrecognized/unsupported machine ID"
888 " (r1 = 0x%08x).\n\n", nr);
889 dump_machine_table(); /* does not return */
890 }
891
892 if (__atags_pointer)
893 tags = phys_to_virt(__atags_pointer);
894 else if (mdesc->atag_offset)
895 tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
896
897#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
898 /*
899 * If we have the old style parameters, convert them to
900 * a tag list.
901 */
902 if (tags->hdr.tag != ATAG_CORE)
903 convert_to_tag_list(tags);
904#endif
905
906 if (tags->hdr.tag != ATAG_CORE) {
907#if defined(CONFIG_OF)
908 /*
909 * If CONFIG_OF is set, then assume this is a reasonably
910 * modern system that should pass boot parameters
911 */
912 early_print("Warning: Neither atags nor dtb found\n");
913#endif
914 tags = (struct tag *)&init_tags;
915 }
916
917 if (mdesc->fixup)
918 mdesc->fixup(tags, &from, &meminfo);
919
920 if (tags->hdr.tag == ATAG_CORE) {
921 if (meminfo.nr_banks != 0)
922 squash_mem_tags(tags);
923 save_atags(tags);
924 parse_tags(tags);
925 }
926
927 /* parse_early_param needs a boot_command_line */
928 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
929
930 return mdesc;
931}
932
933static int __init meminfo_cmp(const void *_a, const void *_b)
934{
935 const struct membank *a = _a, *b = _b;
936 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
937 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
938}
939
940void __init setup_arch(char **cmdline_p)
941{
942 struct machine_desc *mdesc;
943
944 setup_processor();
945 mdesc = setup_machine_fdt(__atags_pointer);
946 if (!mdesc)
947 mdesc = setup_machine_tags(machine_arch_type);
948 machine_desc = mdesc;
949 machine_name = mdesc->name;
950
951 setup_dma_zone(mdesc);
952
953 if (mdesc->restart_mode)
954 reboot_setup(&mdesc->restart_mode);
955
956 init_mm.start_code = (unsigned long) _text;
957 init_mm.end_code = (unsigned long) _etext;
958 init_mm.end_data = (unsigned long) _edata;
959 init_mm.brk = (unsigned long) _end;
960
961 /* populate cmd_line too for later use, preserving boot_command_line */
962 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
963 *cmdline_p = cmd_line;
964
965 parse_early_param();
966
967 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
968 sanity_check_meminfo();
969 arm_memblock_init(&meminfo, mdesc);
970
971 paging_init(mdesc);
972 request_standard_resources(mdesc);
973
974 if (mdesc->restart)
975 arm_pm_restart = mdesc->restart;
976
977 unflatten_device_tree();
978
979#ifdef CONFIG_SMP
980 if (is_smp())
981 smp_init_cpus();
982#endif
983 reserve_crashkernel();
984
985 tcm_init();
986
987#ifdef CONFIG_MULTI_IRQ_HANDLER
988 handle_arch_irq = mdesc->handle_irq;
989#endif
990
991#ifdef CONFIG_VT
992#if defined(CONFIG_VGA_CONSOLE)
993 conswitchp = &vga_con;
994#elif defined(CONFIG_DUMMY_CONSOLE)
995 conswitchp = &dummy_con;
996#endif
997#endif
998
999 if (mdesc->init_early)
1000 mdesc->init_early();
1001}
1002
1003
1004static int __init topology_init(void)
1005{
1006 int cpu;
1007
1008 for_each_possible_cpu(cpu) {
1009 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
1010 cpuinfo->cpu.hotpluggable = 1;
1011 register_cpu(&cpuinfo->cpu, cpu);
1012 }
1013
1014 return 0;
1015}
1016subsys_initcall(topology_init);
1017
1018#ifdef CONFIG_HAVE_PROC_CPU
1019static int __init proc_cpu_init(void)
1020{
1021 struct proc_dir_entry *res;
1022
1023 res = proc_mkdir("cpu", NULL);
1024 if (!res)
1025 return -ENOMEM;
1026 return 0;
1027}
1028fs_initcall(proc_cpu_init);
1029#endif
1030
1031static const char *hwcap_str[] = {
1032 "swp",
1033 "half",
1034 "thumb",
1035 "26bit",
1036 "fastmult",
1037 "fpa",
1038 "vfp",
1039 "edsp",
1040 "java",
1041 "iwmmxt",
1042 "crunch",
1043 "thumbee",
1044 "neon",
1045 "vfpv3",
1046 "vfpv3d16",
1047 "tls",
1048 "vfpv4",
1049 "idiva",
1050 "idivt",
1051 NULL
1052};
1053
1054static int c_show(struct seq_file *m, void *v)
1055{
1056 int i;
1057
1058 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1059 cpu_name, read_cpuid_id() & 15, elf_platform);
1060
1061#if defined(CONFIG_SMP)
1062 for_each_online_cpu(i) {
1063 /*
1064 * glibc reads /proc/cpuinfo to determine the number of
1065 * online processors, looking for lines beginning with
1066 * "processor". Give glibc what it expects.
1067 */
1068 seq_printf(m, "processor\t: %d\n", i);
1069 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1070 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1071 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1072 }
1073#else /* CONFIG_SMP */
1074 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1075 loops_per_jiffy / (500000/HZ),
1076 (loops_per_jiffy / (5000/HZ)) % 100);
1077#endif
1078
1079 /* dump out the processor features */
1080 seq_puts(m, "Features\t: ");
1081
1082 for (i = 0; hwcap_str[i]; i++)
1083 if (elf_hwcap & (1 << i))
1084 seq_printf(m, "%s ", hwcap_str[i]);
1085
1086 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1087 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1088
1089 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1090 /* pre-ARM7 */
1091 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1092 } else {
1093 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1094 /* ARM7 */
1095 seq_printf(m, "CPU variant\t: 0x%02x\n",
1096 (read_cpuid_id() >> 16) & 127);
1097 } else {
1098 /* post-ARM7 */
1099 seq_printf(m, "CPU variant\t: 0x%x\n",
1100 (read_cpuid_id() >> 20) & 15);
1101 }
1102 seq_printf(m, "CPU part\t: 0x%03x\n",
1103 (read_cpuid_id() >> 4) & 0xfff);
1104 }
1105 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1106
1107 seq_puts(m, "\n");
1108
1109 seq_printf(m, "Hardware\t: %s\n", machine_name);
1110 seq_printf(m, "Revision\t: %04x\n", system_rev);
1111 seq_printf(m, "Serial\t\t: %08x%08x\n",
1112 system_serial_high, system_serial_low);
1113
1114 return 0;
1115}
1116
1117static void *c_start(struct seq_file *m, loff_t *pos)
1118{
1119 return *pos < 1 ? (void *)1 : NULL;
1120}
1121
1122static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1123{
1124 ++*pos;
1125 return NULL;
1126}
1127
1128static void c_stop(struct seq_file *m, void *v)
1129{
1130}
1131
1132const struct seq_operations cpuinfo_op = {
1133 .start = c_start,
1134 .next = c_next,
1135 .stop = c_stop,
1136 .show = c_show
1137};