setup.c 23.4 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/*
 *  linux/arch/arm/kernel/setup.c
 *
 *  Copyright (C) 1995-2001 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/utsname.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
20
#include <linux/screen_info.h>
L
Linus Torvalds 已提交
21
#include <linux/init.h>
22
#include <linux/kexec.h>
23
#include <linux/crash_dump.h>
L
Linus Torvalds 已提交
24 25 26
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>
R
Russell King 已提交
27
#include <linux/smp.h>
A
Alexey Dobriyan 已提交
28
#include <linux/fs.h>
29
#include <linux/proc_fs.h>
R
Russell King 已提交
30
#include <linux/memblock.h>
L
Linus Torvalds 已提交
31

32
#include <asm/unified.h>
L
Linus Torvalds 已提交
33
#include <asm/cpu.h>
34
#include <asm/cputype.h>
L
Linus Torvalds 已提交
35 36
#include <asm/elf.h>
#include <asm/procinfo.h>
R
Russell King 已提交
37
#include <asm/sections.h>
L
Linus Torvalds 已提交
38
#include <asm/setup.h>
39
#include <asm/smp_plat.h>
L
Linus Torvalds 已提交
40 41
#include <asm/mach-types.h>
#include <asm/cacheflush.h>
42
#include <asm/cachetype.h>
L
Linus Torvalds 已提交
43 44 45 46 47
#include <asm/tlbflush.h>

#include <asm/mach/arch.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
J
Jason Wessel 已提交
48
#include <asm/traps.h>
49
#include <asm/unwind.h>
L
Linus Torvalds 已提交
50

51
#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
52
#include "compat.h"
53
#endif
54
#include "atags.h"
55
#include "tcm.h"
56

L
Linus Torvalds 已提交
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
#ifndef MEM_SIZE
#define MEM_SIZE	(16*1024*1024)
#endif

#if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
char fpe_type[8];

static int __init fpe_setup(char *line)
{
	memcpy(fpe_type, line, 8);
	return 1;
}

__setup("fpe=", fpe_setup);
#endif

73
extern void paging_init(struct machine_desc *desc);
L
Linus Torvalds 已提交
74 75 76
extern void reboot_setup(char *str);

unsigned int processor_id;
77
EXPORT_SYMBOL(processor_id);
L
Linus Torvalds 已提交
78 79
unsigned int __machine_arch_type;
EXPORT_SYMBOL(__machine_arch_type);
80 81
unsigned int cacheid;
EXPORT_SYMBOL(cacheid);
L
Linus Torvalds 已提交
82

B
Bill Gatliff 已提交
83 84
unsigned int __atags_pointer __initdata;

L
Linus Torvalds 已提交
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109
unsigned int system_rev;
EXPORT_SYMBOL(system_rev);

unsigned int system_serial_low;
EXPORT_SYMBOL(system_serial_low);

unsigned int system_serial_high;
EXPORT_SYMBOL(system_serial_high);

unsigned int elf_hwcap;
EXPORT_SYMBOL(elf_hwcap);


#ifdef MULTI_CPU
struct processor processor;
#endif
#ifdef MULTI_TLB
struct cpu_tlb_fns cpu_tlb;
#endif
#ifdef MULTI_USER
struct cpu_user_fns cpu_user;
#endif
#ifdef MULTI_CACHE
struct cpu_cache_fns cpu_cache;
#endif
110 111
#ifdef CONFIG_OUTER_CACHE
struct outer_cache_fns outer_cache;
112
EXPORT_SYMBOL(outer_cache);
113
#endif
L
Linus Torvalds 已提交
114

R
Russell King 已提交
115 116 117 118 119 120 121 122
struct stack {
	u32 irq[3];
	u32 abt[3];
	u32 und[3];
} ____cacheline_aligned;

static struct stack stacks[NR_CPUS];

L
Linus Torvalds 已提交
123 124 125 126 127
char elf_platform[ELF_PLATFORM_SIZE];
EXPORT_SYMBOL(elf_platform);

static const char *cpu_name;
static const char *machine_name;
128
static char __initdata cmd_line[COMMAND_LINE_SIZE];
L
Linus Torvalds 已提交
129 130 131 132 133 134 135 136 137 138 139

static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
#define ENDIANNESS ((char)endian_test.l)

DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);

/*
 * Standard memory resources
 */
static struct resource mem_res[] = {
140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
	{
		.name = "Video RAM",
		.start = 0,
		.end = 0,
		.flags = IORESOURCE_MEM
	},
	{
		.name = "Kernel text",
		.start = 0,
		.end = 0,
		.flags = IORESOURCE_MEM
	},
	{
		.name = "Kernel data",
		.start = 0,
		.end = 0,
		.flags = IORESOURCE_MEM
	}
L
Linus Torvalds 已提交
158 159 160 161 162 163 164
};

#define video_ram   mem_res[0]
#define kernel_code mem_res[1]
#define kernel_data mem_res[2]

static struct resource io_res[] = {
165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182
	{
		.name = "reserved",
		.start = 0x3bc,
		.end = 0x3be,
		.flags = IORESOURCE_IO | IORESOURCE_BUSY
	},
	{
		.name = "reserved",
		.start = 0x378,
		.end = 0x37f,
		.flags = IORESOURCE_IO | IORESOURCE_BUSY
	},
	{
		.name = "reserved",
		.start = 0x278,
		.end = 0x27f,
		.flags = IORESOURCE_IO | IORESOURCE_BUSY
	}
L
Linus Torvalds 已提交
183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198
};

#define lp0 io_res[0]
#define lp1 io_res[1]
#define lp2 io_res[2]

static const char *proc_arch[] = {
	"undefined/unknown",
	"3",
	"4",
	"4T",
	"5",
	"5T",
	"5TE",
	"5TEJ",
	"6TEJ",
199
	"7",
L
Linus Torvalds 已提交
200 201 202 203 204 205 206 207 208 209 210 211 212
	"?(11)",
	"?(12)",
	"?(13)",
	"?(14)",
	"?(15)",
	"?(16)",
	"?(17)",
};

int cpu_architecture(void)
{
	int cpu_arch;

213
	if ((read_cpuid_id() & 0x0008f000) == 0) {
L
Linus Torvalds 已提交
214
		cpu_arch = CPU_ARCH_UNKNOWN;
215 216 217 218
	} else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
		cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
	} else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
		cpu_arch = (read_cpuid_id() >> 16) & 7;
L
Linus Torvalds 已提交
219 220
		if (cpu_arch)
			cpu_arch += CPU_ARCH_ARMv3;
221
	} else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
		unsigned int mmfr0;

		/* Revised CPUID format. Read the Memory Model Feature
		 * Register 0 and check for VMSAv7 or PMSAv7 */
		asm("mrc	p15, 0, %0, c0, c1, 4"
		    : "=r" (mmfr0));
		if ((mmfr0 & 0x0000000f) == 0x00000003 ||
		    (mmfr0 & 0x000000f0) == 0x00000030)
			cpu_arch = CPU_ARCH_ARMv7;
		else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
			 (mmfr0 & 0x000000f0) == 0x00000020)
			cpu_arch = CPU_ARCH_ARMv6;
		else
			cpu_arch = CPU_ARCH_UNKNOWN;
	} else
		cpu_arch = CPU_ARCH_UNKNOWN;
L
Linus Torvalds 已提交
238 239 240 241

	return cpu_arch;
}

242 243 244 245 246 247 248 249
static int cpu_has_aliasing_icache(unsigned int arch)
{
	int aliasing_icache;
	unsigned int id_reg, num_sets, line_size;

	/* arch specifies the register format */
	switch (arch) {
	case CPU_ARCH_ARMv7:
250 251
		asm("mcr	p15, 2, %0, c0, c0, 0 @ set CSSELR"
		    : /* No output operands */
252
		    : "r" (1));
253 254 255
		isb();
		asm("mrc	p15, 1, %0, c0, c0, 0 @ read CCSIDR"
		    : "=r" (id_reg));
256 257 258 259 260 261 262 263 264 265 266 267 268 269 270
		line_size = 4 << ((id_reg & 0x7) + 2);
		num_sets = ((id_reg >> 13) & 0x7fff) + 1;
		aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
		break;
	case CPU_ARCH_ARMv6:
		aliasing_icache = read_cpuid_cachetype() & (1 << 11);
		break;
	default:
		/* I-cache aliases will be handled by D-cache aliasing code */
		aliasing_icache = 0;
	}

	return aliasing_icache;
}

271 272 273 274 275
static void __init cacheid_init(void)
{
	unsigned int cachetype = read_cpuid_cachetype();
	unsigned int arch = cpu_architecture();

276 277 278 279 280 281
	if (arch >= CPU_ARCH_ARMv6) {
		if ((cachetype & (7 << 29)) == 4 << 29) {
			/* ARMv7 register format */
			cacheid = CACHEID_VIPT_NONALIASING;
			if ((cachetype & (3 << 14)) == 1 << 14)
				cacheid |= CACHEID_ASID_TAGGED;
282 283 284
			else if (cpu_has_aliasing_icache(CPU_ARCH_ARMv7))
				cacheid |= CACHEID_VIPT_I_ALIASING;
		} else if (cachetype & (1 << 23)) {
285
			cacheid = CACHEID_VIPT_ALIASING;
286
		} else {
287
			cacheid = CACHEID_VIPT_NONALIASING;
288 289 290
			if (cpu_has_aliasing_icache(CPU_ARCH_ARMv6))
				cacheid |= CACHEID_VIPT_I_ALIASING;
		}
291 292 293
	} else {
		cacheid = CACHEID_VIVT;
	}
294 295 296 297 298 299 300

	printk("CPU: %s data cache, %s instruction cache\n",
		cache_is_vivt() ? "VIVT" :
		cache_is_vipt_aliasing() ? "VIPT aliasing" :
		cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
		cache_is_vivt() ? "VIVT" :
		icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
301
		icache_is_vipt_aliasing() ? "VIPT aliasing" :
302
		cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
303 304
}

L
Linus Torvalds 已提交
305 306 307 308
/*
 * These functions re-use the assembly code in head.S, which
 * already provide the required functionality.
 */
309
extern struct proc_info_list *lookup_processor_type(unsigned int);
L
Linus Torvalds 已提交
310 311
extern struct machine_desc *lookup_machine_type(unsigned int);

312 313 314 315 316 317 318 319 320 321 322 323 324 325 326
static void __init feat_v6_fixup(void)
{
	int id = read_cpuid_id();

	if ((id & 0xff0f0000) != 0x41070000)
		return;

	/*
	 * HWCAP_TLS is available only on 1136 r1p0 and later,
	 * see also kuser_get_tls_init.
	 */
	if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
		elf_hwcap &= ~HWCAP_TLS;
}

L
Linus Torvalds 已提交
327 328 329 330 331 332 333 334 335
static void __init setup_processor(void)
{
	struct proc_info_list *list;

	/*
	 * locate processor in the list of supported processor
	 * types.  The linker builds this table for us from the
	 * entries in arch/arm/mm/proc-*.S
	 */
336
	list = lookup_processor_type(read_cpuid_id());
L
Linus Torvalds 已提交
337 338
	if (!list) {
		printk("CPU configuration botched (ID %08x), unable "
339
		       "to continue.\n", read_cpuid_id());
L
Linus Torvalds 已提交
340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
		while (1);
	}

	cpu_name = list->cpu_name;

#ifdef MULTI_CPU
	processor = *list->proc;
#endif
#ifdef MULTI_TLB
	cpu_tlb = *list->tlb;
#endif
#ifdef MULTI_USER
	cpu_user = *list->user;
#endif
#ifdef MULTI_CACHE
	cpu_cache = *list->cache;
#endif

358
	printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
359
	       cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
360
	       proc_arch[cpu_architecture()], cr_alignment);
L
Linus Torvalds 已提交
361

362
	sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
L
Linus Torvalds 已提交
363 364
	sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
	elf_hwcap = list->elf_hwcap;
365 366 367
#ifndef CONFIG_ARM_THUMB
	elf_hwcap &= ~HWCAP_THUMB;
#endif
L
Linus Torvalds 已提交
368

369 370
	feat_v6_fixup();

371
	cacheid_init();
L
Linus Torvalds 已提交
372 373 374
	cpu_proc_init();
}

R
Russell King 已提交
375 376 377
/*
 * cpu_init - initialise one CPU.
 *
R
Russell King 已提交
378
 * cpu_init sets up the per-CPU stacks.
R
Russell King 已提交
379
 */
380
void cpu_init(void)
R
Russell King 已提交
381 382 383 384 385 386 387 388 389
{
	unsigned int cpu = smp_processor_id();
	struct stack *stk = &stacks[cpu];

	if (cpu >= NR_CPUS) {
		printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
		BUG();
	}

390 391 392 393 394 395 396 397 398 399
	/*
	 * Define the placement constraint for the inline asm directive below.
	 * In Thumb-2, msr with an immediate value is not allowed.
	 */
#ifdef CONFIG_THUMB2_KERNEL
#define PLC	"r"
#else
#define PLC	"I"
#endif

R
Russell King 已提交
400 401 402 403 404
	/*
	 * setup stacks for re-entrant exception handlers
	 */
	__asm__ (
	"msr	cpsr_c, %1\n\t"
405 406
	"add	r14, %0, %2\n\t"
	"mov	sp, r14\n\t"
R
Russell King 已提交
407
	"msr	cpsr_c, %3\n\t"
408 409
	"add	r14, %0, %4\n\t"
	"mov	sp, r14\n\t"
R
Russell King 已提交
410
	"msr	cpsr_c, %5\n\t"
411 412
	"add	r14, %0, %6\n\t"
	"mov	sp, r14\n\t"
R
Russell King 已提交
413 414 415
	"msr	cpsr_c, %7"
	    :
	    : "r" (stk),
416
	      PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
R
Russell King 已提交
417
	      "I" (offsetof(struct stack, irq[0])),
418
	      PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
R
Russell King 已提交
419
	      "I" (offsetof(struct stack, abt[0])),
420
	      PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
R
Russell King 已提交
421
	      "I" (offsetof(struct stack, und[0])),
422
	      PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
423
	    : "r14");
R
Russell King 已提交
424 425
}

L
Linus Torvalds 已提交
426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444
static struct machine_desc * __init setup_machine(unsigned int nr)
{
	struct machine_desc *list;

	/*
	 * locate machine in the list of supported machines.
	 */
	list = lookup_machine_type(nr);
	if (!list) {
		printk("Machine configuration botched (nr %d), unable "
		       "to continue.\n", nr);
		while (1);
	}

	printk("Machine: %s\n", list->name);

	return list;
}

445
static int __init arm_add_memory(unsigned long start, unsigned long size)
446
{
447 448 449 450 451 452 453
	struct membank *bank = &meminfo.bank[meminfo.nr_banks];

	if (meminfo.nr_banks >= NR_BANKS) {
		printk(KERN_CRIT "NR_BANKS too low, "
			"ignoring memory at %#lx\n", start);
		return -EINVAL;
	}
454

455 456 457 458 459
	/*
	 * Ensure that start/size are aligned to a page boundary.
	 * Size is appropriately rounded down, start is rounded up.
	 */
	size -= start & ~PAGE_MASK;
460 461
	bank->start = PAGE_ALIGN(start);
	bank->size  = size & PAGE_MASK;
462 463 464 465 466

	/*
	 * Check whether this memory region has non-zero size or
	 * invalid node number.
	 */
R
Russell King 已提交
467
	if (bank->size == 0)
468 469 470 471
		return -EINVAL;

	meminfo.nr_banks++;
	return 0;
472 473
}

L
Linus Torvalds 已提交
474 475 476 477
/*
 * Pick out the memory size.  We look for mem=size@start,
 * where start and size are "size[KkMm]"
 */
478
static int __init early_mem(char *p)
L
Linus Torvalds 已提交
479 480 481
{
	static int usermem __initdata = 0;
	unsigned long size, start;
482
	char *endp;
L
Linus Torvalds 已提交
483 484 485 486 487 488 489 490 491 492 493 494

	/*
	 * If the user specifies memory size, we
	 * blow away any automatically generated
	 * size.
	 */
	if (usermem == 0) {
		usermem = 1;
		meminfo.nr_banks = 0;
	}

	start = PHYS_OFFSET;
495 496 497
	size  = memparse(p, &endp);
	if (*endp == '@')
		start = memparse(endp + 1, NULL);
L
Linus Torvalds 已提交
498

A
Andrew Morton 已提交
499
	arm_add_memory(start, size);
L
Linus Torvalds 已提交
500

501
	return 0;
L
Linus Torvalds 已提交
502
}
503
early_param("mem", early_mem);
L
Linus Torvalds 已提交
504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525

static void __init
setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
{
#ifdef CONFIG_BLK_DEV_RAM
	extern int rd_size, rd_image_start, rd_prompt, rd_doload;

	rd_image_start = image_start;
	rd_prompt = prompt;
	rd_doload = doload;

	if (rd_sz)
		rd_size = rd_sz;
#endif
}

static void __init
request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
{
	struct resource *res;
	int i;

R
Russell King 已提交
526 527
	kernel_code.start   = virt_to_phys(_text);
	kernel_code.end     = virt_to_phys(_etext - 1);
528
	kernel_data.start   = virt_to_phys(_sdata);
R
Russell King 已提交
529
	kernel_data.end     = virt_to_phys(_end - 1);
L
Linus Torvalds 已提交
530 531 532 533 534 535 536

	for (i = 0; i < mi->nr_banks; i++) {
		if (mi->bank[i].size == 0)
			continue;

		res = alloc_bootmem_low(sizeof(*res));
		res->name  = "System RAM";
537 538
		res->start = mi->bank[i].start;
		res->end   = mi->bank[i].start + mi->bank[i].size - 1;
L
Linus Torvalds 已提交
539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592
		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;

		request_resource(&iomem_resource, res);

		if (kernel_code.start >= res->start &&
		    kernel_code.end <= res->end)
			request_resource(res, &kernel_code);
		if (kernel_data.start >= res->start &&
		    kernel_data.end <= res->end)
			request_resource(res, &kernel_data);
	}

	if (mdesc->video_start) {
		video_ram.start = mdesc->video_start;
		video_ram.end   = mdesc->video_end;
		request_resource(&iomem_resource, &video_ram);
	}

	/*
	 * Some machines don't have the possibility of ever
	 * possessing lp0, lp1 or lp2
	 */
	if (mdesc->reserve_lp0)
		request_resource(&ioport_resource, &lp0);
	if (mdesc->reserve_lp1)
		request_resource(&ioport_resource, &lp1);
	if (mdesc->reserve_lp2)
		request_resource(&ioport_resource, &lp2);
}

/*
 *  Tag parsing.
 *
 * This is the new way of passing data to the kernel at boot time.  Rather
 * than passing a fixed inflexible structure to the kernel, we pass a list
 * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 * tag for the list to be recognised (to distinguish the tagged list from
 * a param_struct).  The list is terminated with a zero-length tag (this tag
 * is not parsed in any way).
 */
static int __init parse_tag_core(const struct tag *tag)
{
	if (tag->hdr.size > 2) {
		if ((tag->u.core.flags & 1) == 0)
			root_mountflags &= ~MS_RDONLY;
		ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
	}
	return 0;
}

__tagtable(ATAG_CORE, parse_tag_core);

static int __init parse_tag_mem32(const struct tag *tag)
{
593
	return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
L
Linus Torvalds 已提交
594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
}

__tagtable(ATAG_MEM, parse_tag_mem32);

#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
struct screen_info screen_info = {
 .orig_video_lines	= 30,
 .orig_video_cols	= 80,
 .orig_video_mode	= 0,
 .orig_video_ega_bx	= 0,
 .orig_video_isVGA	= 1,
 .orig_video_points	= 8
};

static int __init parse_tag_videotext(const struct tag *tag)
{
	screen_info.orig_x            = tag->u.videotext.x;
	screen_info.orig_y            = tag->u.videotext.y;
	screen_info.orig_video_page   = tag->u.videotext.video_page;
	screen_info.orig_video_mode   = tag->u.videotext.video_mode;
	screen_info.orig_video_cols   = tag->u.videotext.video_cols;
	screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
	screen_info.orig_video_lines  = tag->u.videotext.video_lines;
	screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
	screen_info.orig_video_points = tag->u.videotext.video_points;
	return 0;
}

__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
#endif

static int __init parse_tag_ramdisk(const struct tag *tag)
{
	setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
		      (tag->u.ramdisk.flags & 2) == 0,
		      tag->u.ramdisk.start, tag->u.ramdisk.size);
	return 0;
}

__tagtable(ATAG_RAMDISK, parse_tag_ramdisk);

static int __init parse_tag_serialnr(const struct tag *tag)
{
	system_serial_low = tag->u.serialnr.low;
	system_serial_high = tag->u.serialnr.high;
	return 0;
}

__tagtable(ATAG_SERIAL, parse_tag_serialnr);

static int __init parse_tag_revision(const struct tag *tag)
{
	system_rev = tag->u.revision.rev;
	return 0;
}

__tagtable(ATAG_REVISION, parse_tag_revision);

652
#ifndef CONFIG_CMDLINE_FORCE
L
Linus Torvalds 已提交
653 654 655 656 657 658 659
static int __init parse_tag_cmdline(const struct tag *tag)
{
	strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
	return 0;
}

__tagtable(ATAG_CMDLINE, parse_tag_cmdline);
660
#endif /* CONFIG_CMDLINE_FORCE */
L
Linus Torvalds 已提交
661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721

/*
 * Scan the tag table for this tag, and call its parse function.
 * The tag table is built by the linker from all the __tagtable
 * declarations.
 */
static int __init parse_tag(const struct tag *tag)
{
	extern struct tagtable __tagtable_begin, __tagtable_end;
	struct tagtable *t;

	for (t = &__tagtable_begin; t < &__tagtable_end; t++)
		if (tag->hdr.tag == t->tag) {
			t->parse(tag);
			break;
		}

	return t < &__tagtable_end;
}

/*
 * Parse all tags in the list, checking both the global and architecture
 * specific tag tables.
 */
static void __init parse_tags(const struct tag *t)
{
	for (; t->hdr.size; t = tag_next(t))
		if (!parse_tag(t))
			printk(KERN_WARNING
				"Ignoring unrecognised tag 0x%08x\n",
				t->hdr.tag);
}

/*
 * This holds our defaults.
 */
static struct init_tags {
	struct tag_header hdr1;
	struct tag_core   core;
	struct tag_header hdr2;
	struct tag_mem32  mem;
	struct tag_header hdr3;
} init_tags __initdata = {
	{ tag_size(tag_core), ATAG_CORE },
	{ 1, PAGE_SIZE, 0xff },
	{ tag_size(tag_mem32), ATAG_MEM },
	{ MEM_SIZE, PHYS_OFFSET },
	{ 0, ATAG_NONE }
};

static void (*init_machine)(void) __initdata;

static int __init customize_machine(void)
{
	/* customizes platform devices, or adds new ones */
	if (init_machine)
		init_machine();
	return 0;
}
arch_initcall(customize_machine);

722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770
#ifdef CONFIG_KEXEC
static inline unsigned long long get_total_mem(void)
{
	unsigned long total;

	total = max_low_pfn - min_low_pfn;
	return total << PAGE_SHIFT;
}

/**
 * reserve_crashkernel() - reserves memory are for crash kernel
 *
 * This function reserves memory area given in "crashkernel=" kernel command
 * line parameter. The memory reserved is used by a dump capture kernel when
 * primary kernel is crashing.
 */
static void __init reserve_crashkernel(void)
{
	unsigned long long crash_size, crash_base;
	unsigned long long total_mem;
	int ret;

	total_mem = get_total_mem();
	ret = parse_crashkernel(boot_command_line, total_mem,
				&crash_size, &crash_base);
	if (ret)
		return;

	ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
	if (ret < 0) {
		printk(KERN_WARNING "crashkernel reservation failed - "
		       "memory is in use (0x%lx)\n", (unsigned long)crash_base);
		return;
	}

	printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
	       "for crashkernel (System RAM: %ldMB)\n",
	       (unsigned long)(crash_size >> 20),
	       (unsigned long)(crash_base >> 20),
	       (unsigned long)(total_mem >> 20));

	crashk_res.start = crash_base;
	crashk_res.end = crash_base + crash_size - 1;
	insert_resource(&iomem_resource, &crashk_res);
}
#else
static inline void reserve_crashkernel(void) {}
#endif /* CONFIG_KEXEC */

771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794
/*
 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 * is_kdump_kernel() to determine if we are booting after a panic. Hence
 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 */

#ifdef CONFIG_CRASH_DUMP
/*
 * elfcorehdr= specifies the location of elf core header stored by the crashed
 * kernel. This option will be passed by kexec loader to the capture kernel.
 */
static int __init setup_elfcorehdr(char *arg)
{
	char *end;

	if (!arg)
		return -EINVAL;

	elfcorehdr_addr = memparse(arg, &end);
	return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);
#endif /* CONFIG_CRASH_DUMP */

795 796 797 798 799 800 801
static void __init squash_mem_tags(struct tag *tag)
{
	for (; tag->hdr.size; tag = tag_next(tag))
		if (tag->hdr.tag == ATAG_MEM)
			tag->hdr.tag = ATAG_NONE;
}

L
Linus Torvalds 已提交
802 803 804 805 806 807
void __init setup_arch(char **cmdline_p)
{
	struct tag *tags = (struct tag *)&init_tags;
	struct machine_desc *mdesc;
	char *from = default_command_line;

808 809
	unwind_init();

L
Linus Torvalds 已提交
810 811 812 813 814 815 816
	setup_processor();
	mdesc = setup_machine(machine_arch_type);
	machine_name = mdesc->name;

	if (mdesc->soft_reboot)
		reboot_setup("s");

B
Bill Gatliff 已提交
817 818 819
	if (__atags_pointer)
		tags = phys_to_virt(__atags_pointer);
	else if (mdesc->boot_params)
820
		tags = phys_to_virt(mdesc->boot_params);
L
Linus Torvalds 已提交
821

822
#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
L
Linus Torvalds 已提交
823 824 825 826 827 828
	/*
	 * If we have the old style parameters, convert them to
	 * a tag list.
	 */
	if (tags->hdr.tag != ATAG_CORE)
		convert_to_tag_list(tags);
829
#endif
L
Linus Torvalds 已提交
830 831 832 833 834 835 836 837 838
	if (tags->hdr.tag != ATAG_CORE)
		tags = (struct tag *)&init_tags;

	if (mdesc->fixup)
		mdesc->fixup(mdesc, tags, &from, &meminfo);

	if (tags->hdr.tag == ATAG_CORE) {
		if (meminfo.nr_banks != 0)
			squash_mem_tags(tags);
839
		save_atags(tags);
L
Linus Torvalds 已提交
840 841 842
		parse_tags(tags);
	}

R
Russell King 已提交
843 844 845 846
	init_mm.start_code = (unsigned long) _text;
	init_mm.end_code   = (unsigned long) _etext;
	init_mm.end_data   = (unsigned long) _edata;
	init_mm.brk	   = (unsigned long) _end;
L
Linus Torvalds 已提交
847

848 849 850
	/* parse_early_param needs a boot_command_line */
	strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);

851 852 853
	/* populate cmd_line too for later use, preserving boot_command_line */
	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
	*cmdline_p = cmd_line;
854 855 856

	parse_early_param();

857
	arm_memblock_init(&meminfo, mdesc);
R
Russell King 已提交
858

859
	paging_init(mdesc);
L
Linus Torvalds 已提交
860 861
	request_standard_resources(&meminfo, mdesc);

R
Russell King 已提交
862
#ifdef CONFIG_SMP
863 864
	if (is_smp())
		smp_init_cpus();
R
Russell King 已提交
865
#endif
866
	reserve_crashkernel();
R
Russell King 已提交
867

R
Russell King 已提交
868
	cpu_init();
869
	tcm_init();
R
Russell King 已提交
870

L
Linus Torvalds 已提交
871 872 873
	/*
	 * Set up various architecture-specific pointers
	 */
874
	arch_nr_irqs = mdesc->nr_irqs;
L
Linus Torvalds 已提交
875 876 877 878 879 880 881 882 883 884 885
	init_arch_irq = mdesc->init_irq;
	system_timer = mdesc->timer;
	init_machine = mdesc->init_machine;

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
	conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
#endif
J
Jason Wessel 已提交
886
	early_trap_init();
L
Linus Torvalds 已提交
887 888 889 890 891 892 893
}


static int __init topology_init(void)
{
	int cpu;

894 895 896 897 898
	for_each_possible_cpu(cpu) {
		struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
		cpuinfo->cpu.hotpluggable = 1;
		register_cpu(&cpuinfo->cpu, cpu);
	}
L
Linus Torvalds 已提交
899 900 901 902 903

	return 0;
}
subsys_initcall(topology_init);

904 905 906 907 908 909 910 911 912 913 914 915 916
#ifdef CONFIG_HAVE_PROC_CPU
static int __init proc_cpu_init(void)
{
	struct proc_dir_entry *res;

	res = proc_mkdir("cpu", NULL);
	if (!res)
		return -ENOMEM;
	return 0;
}
fs_initcall(proc_cpu_init);
#endif

L
Linus Torvalds 已提交
917 918 919 920 921 922 923 924 925 926
static const char *hwcap_str[] = {
	"swp",
	"half",
	"thumb",
	"26bit",
	"fastmult",
	"fpa",
	"vfp",
	"edsp",
	"java",
927
	"iwmmxt",
928
	"crunch",
929
	"thumbee",
930
	"neon",
931 932
	"vfpv3",
	"vfpv3d16",
L
Linus Torvalds 已提交
933 934 935 936 937 938 939 940
	NULL
};

static int c_show(struct seq_file *m, void *v)
{
	int i;

	seq_printf(m, "Processor\t: %s rev %d (%s)\n",
941
		   cpu_name, read_cpuid_id() & 15, elf_platform);
L
Linus Torvalds 已提交
942 943 944

#if defined(CONFIG_SMP)
	for_each_online_cpu(i) {
945 946 947 948 949 950
		/*
		 * glibc reads /proc/cpuinfo to determine the number of
		 * online processors, looking for lines beginning with
		 * "processor".  Give glibc what it expects.
		 */
		seq_printf(m, "processor\t: %d\n", i);
L
Linus Torvalds 已提交
951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967
		seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
			   per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
			   (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
	}
#else /* CONFIG_SMP */
	seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
		   loops_per_jiffy / (500000/HZ),
		   (loops_per_jiffy / (5000/HZ)) % 100);
#endif

	/* dump out the processor features */
	seq_puts(m, "Features\t: ");

	for (i = 0; hwcap_str[i]; i++)
		if (elf_hwcap & (1 << i))
			seq_printf(m, "%s ", hwcap_str[i]);

968
	seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
L
Linus Torvalds 已提交
969 970
	seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);

971
	if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
L
Linus Torvalds 已提交
972
		/* pre-ARM7 */
973
		seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
L
Linus Torvalds 已提交
974
	} else {
975
		if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
L
Linus Torvalds 已提交
976 977
			/* ARM7 */
			seq_printf(m, "CPU variant\t: 0x%02x\n",
978
				   (read_cpuid_id() >> 16) & 127);
L
Linus Torvalds 已提交
979 980 981
		} else {
			/* post-ARM7 */
			seq_printf(m, "CPU variant\t: 0x%x\n",
982
				   (read_cpuid_id() >> 20) & 15);
L
Linus Torvalds 已提交
983 984
		}
		seq_printf(m, "CPU part\t: 0x%03x\n",
985
			   (read_cpuid_id() >> 4) & 0xfff);
L
Linus Torvalds 已提交
986
	}
987
	seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
L
Linus Torvalds 已提交
988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013

	seq_puts(m, "\n");

	seq_printf(m, "Hardware\t: %s\n", machine_name);
	seq_printf(m, "Revision\t: %04x\n", system_rev);
	seq_printf(m, "Serial\t\t: %08x%08x\n",
		   system_serial_high, system_serial_low);

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < 1 ? (void *)1 : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return NULL;
}

static void c_stop(struct seq_file *m, void *v)
{
}

1014
const struct seq_operations cpuinfo_op = {
L
Linus Torvalds 已提交
1015 1016 1017 1018 1019
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= c_show
};