setup.c 19.7 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
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>
Linus Torvalds's avatar
Linus Torvalds committed
21 22 23 24
#include <linux/init.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>
25
#include <linux/smp.h>
Alexey Dobriyan's avatar
Alexey Dobriyan committed
26
#include <linux/fs.h>
Linus Torvalds's avatar
Linus Torvalds committed
27 28

#include <asm/cpu.h>
29
#include <asm/cputype.h>
Linus Torvalds's avatar
Linus Torvalds committed
30 31 32 33 34
#include <asm/elf.h>
#include <asm/procinfo.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/cacheflush.h>
35
#include <asm/cachetype.h>
Linus Torvalds's avatar
Linus Torvalds committed
36 37 38 39 40
#include <asm/tlbflush.h>

#include <asm/mach/arch.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
Jason Wessel's avatar
Jason Wessel committed
41
#include <asm/traps.h>
Linus Torvalds's avatar
Linus Torvalds committed
42

43
#include "compat.h"
44
#include "atags.h"
45

Linus Torvalds's avatar
Linus Torvalds committed
46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
#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

extern void paging_init(struct meminfo *, struct machine_desc *desc);
extern void reboot_setup(char *str);
64
extern void _text, _etext, __data_start, _edata, _end;
Linus Torvalds's avatar
Linus Torvalds committed
65 66

unsigned int processor_id;
67
EXPORT_SYMBOL(processor_id);
Linus Torvalds's avatar
Linus Torvalds committed
68 69
unsigned int __machine_arch_type;
EXPORT_SYMBOL(__machine_arch_type);
70 71
unsigned int cacheid;
EXPORT_SYMBOL(cacheid);
Linus Torvalds's avatar
Linus Torvalds committed
72

73 74
unsigned int __atags_pointer __initdata;

Linus Torvalds's avatar
Linus Torvalds committed
75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
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
100 101 102
#ifdef CONFIG_OUTER_CACHE
struct outer_cache_fns outer_cache;
#endif
Linus Torvalds's avatar
Linus Torvalds committed
103

104 105 106 107 108 109 110 111
struct stack {
	u32 irq[3];
	u32 abt[3];
	u32 und[3];
} ____cacheline_aligned;

static struct stack stacks[NR_CPUS];

Linus Torvalds's avatar
Linus Torvalds committed
112 113 114 115 116 117
char elf_platform[ELF_PLATFORM_SIZE];
EXPORT_SYMBOL(elf_platform);

static struct meminfo meminfo __initdata = { 0, };
static const char *cpu_name;
static const char *machine_name;
118
static char __initdata command_line[COMMAND_LINE_SIZE];
Linus Torvalds's avatar
Linus Torvalds committed
119 120 121 122 123 124 125 126 127 128 129

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[] = {
130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147
	{
		.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
	}
Linus Torvalds's avatar
Linus Torvalds committed
148 149 150 151 152 153 154
};

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

static struct resource io_res[] = {
155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
	{
		.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
	}
Linus Torvalds's avatar
Linus Torvalds committed
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188
};

#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",
189
	"7",
Linus Torvalds's avatar
Linus Torvalds committed
190 191 192 193 194 195 196 197 198 199 200 201 202
	"?(11)",
	"?(12)",
	"?(13)",
	"?(14)",
	"?(15)",
	"?(16)",
	"?(17)",
};

int cpu_architecture(void)
{
	int cpu_arch;

203
	if ((read_cpuid_id() & 0x0008f000) == 0) {
Linus Torvalds's avatar
Linus Torvalds committed
204
		cpu_arch = CPU_ARCH_UNKNOWN;
205 206 207 208
	} 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;
Linus Torvalds's avatar
Linus Torvalds committed
209 210
		if (cpu_arch)
			cpu_arch += CPU_ARCH_ARMv3;
211
	} else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
		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;
Linus Torvalds's avatar
Linus Torvalds committed
228 229 230 231

	return cpu_arch;
}

232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248
static void __init cacheid_init(void)
{
	unsigned int cachetype = read_cpuid_cachetype();
	unsigned int arch = cpu_architecture();

	if (arch >= CPU_ARCH_ARMv7) {
		cacheid = CACHEID_VIPT_NONALIASING;
		if ((cachetype & (3 << 14)) == 1 << 14)
			cacheid |= CACHEID_ASID_TAGGED;
	} else if (arch >= CPU_ARCH_ARMv6) {
		if (cachetype & (1 << 23))
			cacheid = CACHEID_VIPT_ALIASING;
		else
			cacheid = CACHEID_VIPT_NONALIASING;
	} else {
		cacheid = CACHEID_VIVT;
	}
249 250 251 252 253 254 255 256 257

	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" :
		cache_is_vipt_aliasing() ? "VIPT aliasing" :
		cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
258 259
}

Linus Torvalds's avatar
Linus Torvalds committed
260 261 262 263
/*
 * These functions re-use the assembly code in head.S, which
 * already provide the required functionality.
 */
264
extern struct proc_info_list *lookup_processor_type(unsigned int);
Linus Torvalds's avatar
Linus Torvalds committed
265 266 267 268 269 270 271 272 273 274 275
extern struct machine_desc *lookup_machine_type(unsigned int);

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
	 */
276
	list = lookup_processor_type(read_cpuid_id());
Linus Torvalds's avatar
Linus Torvalds committed
277 278
	if (!list) {
		printk("CPU configuration botched (ID %08x), unable "
279
		       "to continue.\n", read_cpuid_id());
Linus Torvalds's avatar
Linus Torvalds committed
280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297
		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

298
	printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
299
	       cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
300
	       proc_arch[cpu_architecture()], cr_alignment);
Linus Torvalds's avatar
Linus Torvalds committed
301

302
	sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
Linus Torvalds's avatar
Linus Torvalds committed
303 304
	sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
	elf_hwcap = list->elf_hwcap;
305 306 307
#ifndef CONFIG_ARM_THUMB
	elf_hwcap &= ~HWCAP_THUMB;
#endif
Linus Torvalds's avatar
Linus Torvalds committed
308

309
	cacheid_init();
Linus Torvalds's avatar
Linus Torvalds committed
310 311 312
	cpu_proc_init();
}

313 314 315
/*
 * cpu_init - initialise one CPU.
 *
316
 * cpu_init sets up the per-CPU stacks.
317
 */
318
void cpu_init(void)
319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346
{
	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();
	}

	/*
	 * setup stacks for re-entrant exception handlers
	 */
	__asm__ (
	"msr	cpsr_c, %1\n\t"
	"add	sp, %0, %2\n\t"
	"msr	cpsr_c, %3\n\t"
	"add	sp, %0, %4\n\t"
	"msr	cpsr_c, %5\n\t"
	"add	sp, %0, %6\n\t"
	"msr	cpsr_c, %7"
	    :
	    : "r" (stk),
	      "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
	      "I" (offsetof(struct stack, irq[0])),
	      "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
	      "I" (offsetof(struct stack, abt[0])),
	      "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
	      "I" (offsetof(struct stack, und[0])),
347 348
	      "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
	    : "r14");
349 350
}

Linus Torvalds's avatar
Linus Torvalds committed
351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369
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;
}

Andrew Morton's avatar
Andrew Morton committed
370
static void __init arm_add_memory(unsigned long start, unsigned long size)
371
{
372 373
	struct membank *bank;

374 375 376 377 378 379
	/*
	 * Ensure that start/size are aligned to a page boundary.
	 * Size is appropriately rounded down, start is rounded up.
	 */
	size -= start & ~PAGE_MASK;

380 381 382 383 384
	bank = &meminfo.bank[meminfo.nr_banks++];

	bank->start = PAGE_ALIGN(start);
	bank->size  = size & PAGE_MASK;
	bank->node  = PHYS_TO_NID(start);
385 386
}

Linus Torvalds's avatar
Linus Torvalds committed
387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410
/*
 * Pick out the memory size.  We look for mem=size@start,
 * where start and size are "size[KkMm]"
 */
static void __init early_mem(char **p)
{
	static int usermem __initdata = 0;
	unsigned long size, start;

	/*
	 * 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;
	size  = memparse(*p, p);
	if (**p == '@')
		start = memparse(*p + 1, p);

Andrew Morton's avatar
Andrew Morton committed
411
	arm_add_memory(start, size);
Linus Torvalds's avatar
Linus Torvalds committed
412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428
}
__early_param("mem=", early_mem);

/*
 * Initial parsing of the command line.
 */
static void __init parse_cmdline(char **cmdline_p, char *from)
{
	char c = ' ', *to = command_line;
	int len = 0;

	for (;;) {
		if (c == ' ') {
			extern struct early_params __early_begin, __early_end;
			struct early_params *p;

			for (p = &__early_begin; p < &__early_end; p++) {
429
				int arglen = strlen(p->arg);
Linus Torvalds's avatar
Linus Torvalds committed
430

431
				if (memcmp(from, p->arg, arglen) == 0) {
Linus Torvalds's avatar
Linus Torvalds committed
432 433
					if (to != command_line)
						to -= 1;
434
					from += arglen;
Linus Torvalds's avatar
Linus Torvalds committed
435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552
					p->fn(&from);

					while (*from != ' ' && *from != '\0')
						from++;
					break;
				}
			}
		}
		c = *from++;
		if (!c)
			break;
		if (COMMAND_LINE_SIZE <= ++len)
			break;
		*to++ = c;
	}
	*to = '\0';
	*cmdline_p = command_line;
}

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;

	kernel_code.start   = virt_to_phys(&_text);
	kernel_code.end     = virt_to_phys(&_etext - 1);
	kernel_data.start   = virt_to_phys(&__data_start);
	kernel_data.end     = virt_to_phys(&_end - 1);

	for (i = 0; i < mi->nr_banks; i++) {
		unsigned long virt_start, virt_end;

		if (mi->bank[i].size == 0)
			continue;

		virt_start = __phys_to_virt(mi->bank[i].start);
		virt_end   = virt_start + mi->bank[i].size - 1;

		res = alloc_bootmem_low(sizeof(*res));
		res->name  = "System RAM";
		res->start = __virt_to_phys(virt_start);
		res->end   = __virt_to_phys(virt_end);
		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)
{
	if (meminfo.nr_banks >= NR_BANKS) {
		printk(KERN_WARNING
		       "Ignoring memory bank 0x%08x size %dKB\n",
			tag->u.mem.start, tag->u.mem.size / 1024);
		return -EINVAL;
	}
Andrew Morton's avatar
Andrew Morton committed
553
	arm_add_memory(tag->u.mem.start, tag->u.mem.size);
Linus Torvalds's avatar
Linus Torvalds committed
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693
	return 0;
}

__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);

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);

/*
 * 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);

void __init setup_arch(char **cmdline_p)
{
	struct tag *tags = (struct tag *)&init_tags;
	struct machine_desc *mdesc;
	char *from = default_command_line;

	setup_processor();
	mdesc = setup_machine(machine_arch_type);
	machine_name = mdesc->name;

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

694 695 696
	if (__atags_pointer)
		tags = phys_to_virt(__atags_pointer);
	else if (mdesc->boot_params)
697
		tags = phys_to_virt(mdesc->boot_params);
Linus Torvalds's avatar
Linus Torvalds committed
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713

	/*
	 * If we have the old style parameters, convert them to
	 * a tag list.
	 */
	if (tags->hdr.tag != ATAG_CORE)
		convert_to_tag_list(tags);
	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);
714
		save_atags(tags);
Linus Torvalds's avatar
Linus Torvalds committed
715 716 717 718 719 720 721 722
		parse_tags(tags);
	}

	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;

723 724
	memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
	boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
Linus Torvalds's avatar
Linus Torvalds committed
725 726 727 728
	parse_cmdline(cmdline_p, from);
	paging_init(&meminfo, mdesc);
	request_standard_resources(&meminfo, mdesc);

729 730 731 732
#ifdef CONFIG_SMP
	smp_init_cpus();
#endif

733 734
	cpu_init();

Linus Torvalds's avatar
Linus Torvalds committed
735 736 737 738 739 740 741 742 743 744 745 746 747 748
	/*
	 * Set up various architecture-specific pointers
	 */
	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
Jason Wessel's avatar
Jason Wessel committed
749
	early_trap_init();
Linus Torvalds's avatar
Linus Torvalds committed
750 751 752 753 754 755 756
}


static int __init topology_init(void)
{
	int cpu;

757 758 759 760 761
	for_each_possible_cpu(cpu) {
		struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
		cpuinfo->cpu.hotpluggable = 1;
		register_cpu(&cpuinfo->cpu, cpu);
	}
Linus Torvalds's avatar
Linus Torvalds committed
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777

	return 0;
}

subsys_initcall(topology_init);

static const char *hwcap_str[] = {
	"swp",
	"half",
	"thumb",
	"26bit",
	"fastmult",
	"fpa",
	"vfp",
	"edsp",
	"java",
778
	"iwmmxt",
779
	"crunch",
Linus Torvalds's avatar
Linus Torvalds committed
780 781 782 783 784 785 786 787
	NULL
};

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

	seq_printf(m, "Processor\t: %s rev %d (%s)\n",
788
		   cpu_name, read_cpuid_id() & 15, elf_platform);
Linus Torvalds's avatar
Linus Torvalds committed
789 790 791

#if defined(CONFIG_SMP)
	for_each_online_cpu(i) {
792 793 794 795 796 797
		/*
		 * 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);
Linus Torvalds's avatar
Linus Torvalds committed
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814
		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]);

815
	seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
Linus Torvalds's avatar
Linus Torvalds committed
816 817
	seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);

818
	if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
Linus Torvalds's avatar
Linus Torvalds committed
819
		/* pre-ARM7 */
820
		seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
Linus Torvalds's avatar
Linus Torvalds committed
821
	} else {
822
		if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
Linus Torvalds's avatar
Linus Torvalds committed
823 824
			/* ARM7 */
			seq_printf(m, "CPU variant\t: 0x%02x\n",
825
				   (read_cpuid_id() >> 16) & 127);
Linus Torvalds's avatar
Linus Torvalds committed
826 827 828
		} else {
			/* post-ARM7 */
			seq_printf(m, "CPU variant\t: 0x%x\n",
829
				   (read_cpuid_id() >> 20) & 15);
Linus Torvalds's avatar
Linus Torvalds committed
830 831
		}
		seq_printf(m, "CPU part\t: 0x%03x\n",
832
			   (read_cpuid_id() >> 4) & 0xfff);
Linus Torvalds's avatar
Linus Torvalds committed
833
	}
834
	seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
Linus Torvalds's avatar
Linus Torvalds committed
835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860

	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)
{
}

861
const struct seq_operations cpuinfo_op = {
Linus Torvalds's avatar
Linus Torvalds committed
862 863 864 865 866
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= c_show
};