blob: 336f14e0e5c212685c09f13f8ecbb30662873354 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#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>
Jon Smirl894673e2006-07-10 04:44:13 -070020#include <linux/screen_info.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/init.h>
Mika Westerberg3c57fb42010-05-10 09:20:22 +010022#include <linux/kexec.h>
Mika Westerbergcea0bb12010-05-10 09:29:32 +010023#include <linux/crash_dump.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/root_dev.h>
25#include <linux/cpu.h>
26#include <linux/interrupt.h>
Russell King7bbb7942006-02-16 11:08:09 +000027#include <linux/smp.h>
Alexey Dobriyan4e950f62007-07-30 02:36:13 +040028#include <linux/fs.h>
Russell Kinge119bff2010-01-10 17:23:29 +000029#include <linux/proc_fs.h>
Russell King2778f622010-07-09 16:27:52 +010030#include <linux/memblock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
Catalin Marinasb86040a2009-07-24 12:32:54 +010032#include <asm/unified.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <asm/cpu.h>
Russell King0ba8b9b2008-08-10 18:08:10 +010034#include <asm/cputype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <asm/elf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/procinfo.h>
Russell King37efe642008-12-01 11:53:07 +000037#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <asm/setup.h>
Russell Kingf00ec482010-09-04 10:47:48 +010039#include <asm/smp_plat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <asm/mach-types.h>
41#include <asm/cacheflush.h>
Russell King46097c72008-08-10 18:10:19 +010042#include <asm/cachetype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <asm/tlbflush.h>
44
45#include <asm/mach/arch.h>
46#include <asm/mach/irq.h>
47#include <asm/mach/time.h>
Jason Wessel5cbad0e2008-02-20 13:33:40 -060048#include <asm/traps.h>
Catalin Marinasbff595c2009-02-16 11:41:36 +010049#include <asm/unwind.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Uwe Kleine-König73a65b32010-01-19 10:13:14 +010051#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
Ben Dooks0fc1c832006-03-15 23:17:30 +000052#include "compat.h"
Uwe Kleine-König73a65b32010-01-19 10:13:14 +010053#endif
Richard Purdie4cd9d6f2008-01-02 00:56:46 +010054#include "atags.h"
Linus Walleijbc581772009-09-15 17:30:37 +010055#include "tcm.h"
Ben Dooks0fc1c832006-03-15 23:17:30 +000056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#ifndef MEM_SIZE
58#define MEM_SIZE (16*1024*1024)
59#endif
60
61#if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
62char fpe_type[8];
63
64static int __init fpe_setup(char *line)
65{
66 memcpy(fpe_type, line, 8);
67 return 1;
68}
69
70__setup("fpe=", fpe_setup);
71#endif
72
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -040073extern void paging_init(struct machine_desc *desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074extern void reboot_setup(char *str);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76unsigned int processor_id;
Krzysztof Halasac18f6582007-12-18 03:53:27 +010077EXPORT_SYMBOL(processor_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078unsigned int __machine_arch_type;
79EXPORT_SYMBOL(__machine_arch_type);
Russell Kingc0e95872008-09-25 15:35:28 +010080unsigned int cacheid;
81EXPORT_SYMBOL(cacheid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Bill Gatliff9d20fdd2007-05-31 22:02:22 +010083unsigned int __atags_pointer __initdata;
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085unsigned int system_rev;
86EXPORT_SYMBOL(system_rev);
87
88unsigned int system_serial_low;
89EXPORT_SYMBOL(system_serial_low);
90
91unsigned int system_serial_high;
92EXPORT_SYMBOL(system_serial_high);
93
94unsigned int elf_hwcap;
95EXPORT_SYMBOL(elf_hwcap);
96
97
98#ifdef MULTI_CPU
99struct processor processor;
100#endif
101#ifdef MULTI_TLB
102struct cpu_tlb_fns cpu_tlb;
103#endif
104#ifdef MULTI_USER
105struct cpu_user_fns cpu_user;
106#endif
107#ifdef MULTI_CACHE
108struct cpu_cache_fns cpu_cache;
109#endif
Catalin Marinas953233d2007-02-05 14:48:08 +0100110#ifdef CONFIG_OUTER_CACHE
111struct outer_cache_fns outer_cache;
Santosh Shilimkar6c09f092010-02-16 07:57:43 +0100112EXPORT_SYMBOL(outer_cache);
Catalin Marinas953233d2007-02-05 14:48:08 +0100113#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Russell Kingccea7a12005-05-31 22:22:32 +0100115struct stack {
116 u32 irq[3];
117 u32 abt[3];
118 u32 und[3];
119} ____cacheline_aligned;
120
121static struct stack stacks[NR_CPUS];
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123char elf_platform[ELF_PLATFORM_SIZE];
124EXPORT_SYMBOL(elf_platform);
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126static const char *cpu_name;
127static const char *machine_name;
Jeremy Kerr48ab7e02010-01-27 01:13:31 +0100128static char __initdata cmd_line[COMMAND_LINE_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
131static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
132#define ENDIANNESS ((char)endian_test.l)
133
134DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
135
136/*
137 * Standard memory resources
138 */
139static struct resource mem_res[] = {
Greg Kroah-Hartman740e5182006-06-12 14:47:06 -0700140 {
141 .name = "Video RAM",
142 .start = 0,
143 .end = 0,
144 .flags = IORESOURCE_MEM
145 },
146 {
147 .name = "Kernel text",
148 .start = 0,
149 .end = 0,
150 .flags = IORESOURCE_MEM
151 },
152 {
153 .name = "Kernel data",
154 .start = 0,
155 .end = 0,
156 .flags = IORESOURCE_MEM
157 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158};
159
160#define video_ram mem_res[0]
161#define kernel_code mem_res[1]
162#define kernel_data mem_res[2]
163
164static struct resource io_res[] = {
Greg Kroah-Hartman740e5182006-06-12 14:47:06 -0700165 {
166 .name = "reserved",
167 .start = 0x3bc,
168 .end = 0x3be,
169 .flags = IORESOURCE_IO | IORESOURCE_BUSY
170 },
171 {
172 .name = "reserved",
173 .start = 0x378,
174 .end = 0x37f,
175 .flags = IORESOURCE_IO | IORESOURCE_BUSY
176 },
177 {
178 .name = "reserved",
179 .start = 0x278,
180 .end = 0x27f,
181 .flags = IORESOURCE_IO | IORESOURCE_BUSY
182 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183};
184
185#define lp0 io_res[0]
186#define lp1 io_res[1]
187#define lp2 io_res[2]
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189static const char *proc_arch[] = {
190 "undefined/unknown",
191 "3",
192 "4",
193 "4T",
194 "5",
195 "5T",
196 "5TE",
197 "5TEJ",
198 "6TEJ",
Catalin Marinas6b090a22006-01-12 16:28:16 +0000199 "7",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 "?(11)",
201 "?(12)",
202 "?(13)",
203 "?(14)",
204 "?(15)",
205 "?(16)",
206 "?(17)",
207};
208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209int cpu_architecture(void)
210{
211 int cpu_arch;
212
Russell King0ba8b9b2008-08-10 18:08:10 +0100213 if ((read_cpuid_id() & 0x0008f000) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 cpu_arch = CPU_ARCH_UNKNOWN;
Russell King0ba8b9b2008-08-10 18:08:10 +0100215 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
216 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
217 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
218 cpu_arch = (read_cpuid_id() >> 16) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 if (cpu_arch)
220 cpu_arch += CPU_ARCH_ARMv3;
Russell King0ba8b9b2008-08-10 18:08:10 +0100221 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
Catalin Marinas180005c2007-09-25 16:49:45 +0100222 unsigned int mmfr0;
223
224 /* Revised CPUID format. Read the Memory Model Feature
225 * Register 0 and check for VMSAv7 or PMSAv7 */
226 asm("mrc p15, 0, %0, c0, c1, 4"
227 : "=r" (mmfr0));
228 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
229 (mmfr0 & 0x000000f0) == 0x00000030)
230 cpu_arch = CPU_ARCH_ARMv7;
231 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
232 (mmfr0 & 0x000000f0) == 0x00000020)
233 cpu_arch = CPU_ARCH_ARMv6;
234 else
235 cpu_arch = CPU_ARCH_UNKNOWN;
236 } else
237 cpu_arch = CPU_ARCH_UNKNOWN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 return cpu_arch;
240}
241
Will Deacon8925ec42010-09-13 16:18:30 +0100242static int cpu_has_aliasing_icache(unsigned int arch)
243{
244 int aliasing_icache;
245 unsigned int id_reg, num_sets, line_size;
246
247 /* arch specifies the register format */
248 switch (arch) {
249 case CPU_ARCH_ARMv7:
Linus Walleij5fb31a92010-10-06 11:07:28 +0100250 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR"
251 : /* No output operands */
Will Deacon8925ec42010-09-13 16:18:30 +0100252 : "r" (1));
Linus Walleij5fb31a92010-10-06 11:07:28 +0100253 isb();
254 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR"
255 : "=r" (id_reg));
Will Deacon8925ec42010-09-13 16:18:30 +0100256 line_size = 4 << ((id_reg & 0x7) + 2);
257 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
258 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
259 break;
260 case CPU_ARCH_ARMv6:
261 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
262 break;
263 default:
264 /* I-cache aliases will be handled by D-cache aliasing code */
265 aliasing_icache = 0;
266 }
267
268 return aliasing_icache;
269}
270
Russell Kingc0e95872008-09-25 15:35:28 +0100271static void __init cacheid_init(void)
272{
273 unsigned int cachetype = read_cpuid_cachetype();
274 unsigned int arch = cpu_architecture();
275
Catalin Marinasb57ee992009-03-03 11:44:12 +0100276 if (arch >= CPU_ARCH_ARMv6) {
277 if ((cachetype & (7 << 29)) == 4 << 29) {
278 /* ARMv7 register format */
279 cacheid = CACHEID_VIPT_NONALIASING;
280 if ((cachetype & (3 << 14)) == 1 << 14)
281 cacheid |= CACHEID_ASID_TAGGED;
Will Deacon8925ec42010-09-13 16:18:30 +0100282 else if (cpu_has_aliasing_icache(CPU_ARCH_ARMv7))
283 cacheid |= CACHEID_VIPT_I_ALIASING;
284 } else if (cachetype & (1 << 23)) {
Russell Kingc0e95872008-09-25 15:35:28 +0100285 cacheid = CACHEID_VIPT_ALIASING;
Will Deacon8925ec42010-09-13 16:18:30 +0100286 } else {
Russell Kingc0e95872008-09-25 15:35:28 +0100287 cacheid = CACHEID_VIPT_NONALIASING;
Will Deacon8925ec42010-09-13 16:18:30 +0100288 if (cpu_has_aliasing_icache(CPU_ARCH_ARMv6))
289 cacheid |= CACHEID_VIPT_I_ALIASING;
290 }
Russell Kingc0e95872008-09-25 15:35:28 +0100291 } else {
292 cacheid = CACHEID_VIVT;
293 }
Russell King2b4ae1f2008-09-25 15:39:20 +0100294
295 printk("CPU: %s data cache, %s instruction cache\n",
296 cache_is_vivt() ? "VIVT" :
297 cache_is_vipt_aliasing() ? "VIPT aliasing" :
298 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
299 cache_is_vivt() ? "VIVT" :
300 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
Will Deacon8925ec42010-09-13 16:18:30 +0100301 icache_is_vipt_aliasing() ? "VIPT aliasing" :
Russell King2b4ae1f2008-09-25 15:39:20 +0100302 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
Russell Kingc0e95872008-09-25 15:35:28 +0100303}
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305/*
306 * These functions re-use the assembly code in head.S, which
307 * already provide the required functionality.
308 */
Russell King0f44ba12006-02-24 21:04:56 +0000309extern struct proc_info_list *lookup_processor_type(unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310extern struct machine_desc *lookup_machine_type(unsigned int);
311
Tony Lindgrenf159f4e2010-07-05 14:53:10 +0100312static void __init feat_v6_fixup(void)
313{
314 int id = read_cpuid_id();
315
316 if ((id & 0xff0f0000) != 0x41070000)
317 return;
318
319 /*
320 * HWCAP_TLS is available only on 1136 r1p0 and later,
321 * see also kuser_get_tls_init.
322 */
323 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
324 elf_hwcap &= ~HWCAP_TLS;
325}
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327static void __init setup_processor(void)
328{
329 struct proc_info_list *list;
330
331 /*
332 * locate processor in the list of supported processor
333 * types. The linker builds this table for us from the
334 * entries in arch/arm/mm/proc-*.S
335 */
Russell King0ba8b9b2008-08-10 18:08:10 +0100336 list = lookup_processor_type(read_cpuid_id());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (!list) {
338 printk("CPU configuration botched (ID %08x), unable "
Russell King0ba8b9b2008-08-10 18:08:10 +0100339 "to continue.\n", read_cpuid_id());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 while (1);
341 }
342
343 cpu_name = list->cpu_name;
344
345#ifdef MULTI_CPU
346 processor = *list->proc;
347#endif
348#ifdef MULTI_TLB
349 cpu_tlb = *list->tlb;
350#endif
351#ifdef MULTI_USER
352 cpu_user = *list->user;
353#endif
354#ifdef MULTI_CACHE
355 cpu_cache = *list->cache;
356#endif
357
Russell King4e190252006-07-03 13:29:38 +0100358 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
Russell King0ba8b9b2008-08-10 18:08:10 +0100359 cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
Russell King264edb32006-06-29 15:03:09 +0100360 proc_arch[cpu_architecture()], cr_alignment);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Serge E. Hallyn96b644b2006-10-02 02:18:13 -0700362 sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
364 elf_hwcap = list->elf_hwcap;
Catalin Marinasadeff422006-04-10 21:32:35 +0100365#ifndef CONFIG_ARM_THUMB
366 elf_hwcap &= ~HWCAP_THUMB;
367#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Tony Lindgrenf159f4e2010-07-05 14:53:10 +0100369 feat_v6_fixup();
370
Russell Kingc0e95872008-09-25 15:35:28 +0100371 cacheid_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 cpu_proc_init();
373}
374
Russell Kingccea7a12005-05-31 22:22:32 +0100375/*
376 * cpu_init - initialise one CPU.
377 *
Russell King90f1e082008-09-25 14:45:02 +0100378 * cpu_init sets up the per-CPU stacks.
Russell Kingccea7a12005-05-31 22:22:32 +0100379 */
Russell King36c5ed22005-06-19 18:39:33 +0100380void cpu_init(void)
Russell Kingccea7a12005-05-31 22:22:32 +0100381{
382 unsigned int cpu = smp_processor_id();
383 struct stack *stk = &stacks[cpu];
384
385 if (cpu >= NR_CPUS) {
386 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
387 BUG();
388 }
389
Russell Kingccea7a12005-05-31 22:22:32 +0100390 /*
Catalin Marinasb86040a2009-07-24 12:32:54 +0100391 * Define the placement constraint for the inline asm directive below.
392 * In Thumb-2, msr with an immediate value is not allowed.
393 */
394#ifdef CONFIG_THUMB2_KERNEL
395#define PLC "r"
396#else
397#define PLC "I"
398#endif
399
400 /*
Russell Kingccea7a12005-05-31 22:22:32 +0100401 * setup stacks for re-entrant exception handlers
402 */
403 __asm__ (
404 "msr cpsr_c, %1\n\t"
Catalin Marinasb86040a2009-07-24 12:32:54 +0100405 "add r14, %0, %2\n\t"
406 "mov sp, r14\n\t"
Russell Kingccea7a12005-05-31 22:22:32 +0100407 "msr cpsr_c, %3\n\t"
Catalin Marinasb86040a2009-07-24 12:32:54 +0100408 "add r14, %0, %4\n\t"
409 "mov sp, r14\n\t"
Russell Kingccea7a12005-05-31 22:22:32 +0100410 "msr cpsr_c, %5\n\t"
Catalin Marinasb86040a2009-07-24 12:32:54 +0100411 "add r14, %0, %6\n\t"
412 "mov sp, r14\n\t"
Russell Kingccea7a12005-05-31 22:22:32 +0100413 "msr cpsr_c, %7"
414 :
415 : "r" (stk),
Catalin Marinasb86040a2009-07-24 12:32:54 +0100416 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
Russell Kingccea7a12005-05-31 22:22:32 +0100417 "I" (offsetof(struct stack, irq[0])),
Catalin Marinasb86040a2009-07-24 12:32:54 +0100418 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
Russell Kingccea7a12005-05-31 22:22:32 +0100419 "I" (offsetof(struct stack, abt[0])),
Catalin Marinasb86040a2009-07-24 12:32:54 +0100420 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
Russell Kingccea7a12005-05-31 22:22:32 +0100421 "I" (offsetof(struct stack, und[0])),
Catalin Marinasb86040a2009-07-24 12:32:54 +0100422 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
Catalin Marinasaaaa3f92005-06-29 15:34:39 +0100423 : "r14");
Russell Kingccea7a12005-05-31 22:22:32 +0100424}
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426static struct machine_desc * __init setup_machine(unsigned int nr)
427{
428 struct machine_desc *list;
429
430 /*
431 * locate machine in the list of supported machines.
432 */
433 list = lookup_machine_type(nr);
434 if (!list) {
435 printk("Machine configuration botched (nr %d), unable "
436 "to continue.\n", nr);
437 while (1);
438 }
439
440 printk("Machine: %s\n", list->name);
441
442 return list;
443}
444
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -0400445static int __init arm_add_memory(unsigned long start, unsigned long size)
Russell King3a669412005-06-22 21:43:10 +0100446{
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -0400447 struct membank *bank = &meminfo.bank[meminfo.nr_banks];
448
449 if (meminfo.nr_banks >= NR_BANKS) {
450 printk(KERN_CRIT "NR_BANKS too low, "
451 "ignoring memory at %#lx\n", start);
452 return -EINVAL;
453 }
Russell King05f96ef2006-11-30 20:44:49 +0000454
Russell King3a669412005-06-22 21:43:10 +0100455 /*
456 * Ensure that start/size are aligned to a page boundary.
457 * Size is appropriately rounded down, start is rounded up.
458 */
459 size -= start & ~PAGE_MASK;
Russell King05f96ef2006-11-30 20:44:49 +0000460 bank->start = PAGE_ALIGN(start);
461 bank->size = size & PAGE_MASK;
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -0400462
463 /*
464 * Check whether this memory region has non-zero size or
465 * invalid node number.
466 */
Russell Kingbe370302010-05-07 17:40:33 +0100467 if (bank->size == 0)
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -0400468 return -EINVAL;
469
470 meminfo.nr_banks++;
471 return 0;
Russell King3a669412005-06-22 21:43:10 +0100472}
473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474/*
475 * Pick out the memory size. We look for mem=size@start,
476 * where start and size are "size[KkMm]"
477 */
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +0100478static int __init early_mem(char *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
480 static int usermem __initdata = 0;
481 unsigned long size, start;
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +0100482 char *endp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 /*
485 * If the user specifies memory size, we
486 * blow away any automatically generated
487 * size.
488 */
489 if (usermem == 0) {
490 usermem = 1;
491 meminfo.nr_banks = 0;
492 }
493
494 start = PHYS_OFFSET;
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +0100495 size = memparse(p, &endp);
496 if (*endp == '@')
497 start = memparse(endp + 1, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
Andrew Morton1c97b732006-04-20 21:41:18 +0100499 arm_add_memory(start, size);
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +0100500
501 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +0100503early_param("mem", early_mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505static void __init
506setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
507{
508#ifdef CONFIG_BLK_DEV_RAM
509 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
510
511 rd_image_start = image_start;
512 rd_prompt = prompt;
513 rd_doload = doload;
514
515 if (rd_sz)
516 rd_size = rd_sz;
517#endif
518}
519
520static void __init
521request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
522{
523 struct resource *res;
524 int i;
525
Russell King37efe642008-12-01 11:53:07 +0000526 kernel_code.start = virt_to_phys(_text);
527 kernel_code.end = virt_to_phys(_etext - 1);
Russell King842eab42010-10-01 14:12:22 +0100528 kernel_data.start = virt_to_phys(_sdata);
Russell King37efe642008-12-01 11:53:07 +0000529 kernel_data.end = virt_to_phys(_end - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 for (i = 0; i < mi->nr_banks; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 if (mi->bank[i].size == 0)
533 continue;
534
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 res = alloc_bootmem_low(sizeof(*res));
536 res->name = "System RAM";
Nicolas Pitre3319f5e2008-10-02 03:29:22 +0100537 res->start = mi->bank[i].start;
538 res->end = mi->bank[i].start + mi->bank[i].size - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
540
541 request_resource(&iomem_resource, res);
542
543 if (kernel_code.start >= res->start &&
544 kernel_code.end <= res->end)
545 request_resource(res, &kernel_code);
546 if (kernel_data.start >= res->start &&
547 kernel_data.end <= res->end)
548 request_resource(res, &kernel_data);
549 }
550
551 if (mdesc->video_start) {
552 video_ram.start = mdesc->video_start;
553 video_ram.end = mdesc->video_end;
554 request_resource(&iomem_resource, &video_ram);
555 }
556
557 /*
558 * Some machines don't have the possibility of ever
559 * possessing lp0, lp1 or lp2
560 */
561 if (mdesc->reserve_lp0)
562 request_resource(&ioport_resource, &lp0);
563 if (mdesc->reserve_lp1)
564 request_resource(&ioport_resource, &lp1);
565 if (mdesc->reserve_lp2)
566 request_resource(&ioport_resource, &lp2);
567}
568
569/*
570 * Tag parsing.
571 *
572 * This is the new way of passing data to the kernel at boot time. Rather
573 * than passing a fixed inflexible structure to the kernel, we pass a list
574 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
575 * tag for the list to be recognised (to distinguish the tagged list from
576 * a param_struct). The list is terminated with a zero-length tag (this tag
577 * is not parsed in any way).
578 */
579static int __init parse_tag_core(const struct tag *tag)
580{
581 if (tag->hdr.size > 2) {
582 if ((tag->u.core.flags & 1) == 0)
583 root_mountflags &= ~MS_RDONLY;
584 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
585 }
586 return 0;
587}
588
589__tagtable(ATAG_CORE, parse_tag_core);
590
591static int __init parse_tag_mem32(const struct tag *tag)
592{
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -0400593 return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
596__tagtable(ATAG_MEM, parse_tag_mem32);
597
598#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
599struct screen_info screen_info = {
600 .orig_video_lines = 30,
601 .orig_video_cols = 80,
602 .orig_video_mode = 0,
603 .orig_video_ega_bx = 0,
604 .orig_video_isVGA = 1,
605 .orig_video_points = 8
606};
607
608static int __init parse_tag_videotext(const struct tag *tag)
609{
610 screen_info.orig_x = tag->u.videotext.x;
611 screen_info.orig_y = tag->u.videotext.y;
612 screen_info.orig_video_page = tag->u.videotext.video_page;
613 screen_info.orig_video_mode = tag->u.videotext.video_mode;
614 screen_info.orig_video_cols = tag->u.videotext.video_cols;
615 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
616 screen_info.orig_video_lines = tag->u.videotext.video_lines;
617 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
618 screen_info.orig_video_points = tag->u.videotext.video_points;
619 return 0;
620}
621
622__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
623#endif
624
625static int __init parse_tag_ramdisk(const struct tag *tag)
626{
627 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
628 (tag->u.ramdisk.flags & 2) == 0,
629 tag->u.ramdisk.start, tag->u.ramdisk.size);
630 return 0;
631}
632
633__tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
634
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635static int __init parse_tag_serialnr(const struct tag *tag)
636{
637 system_serial_low = tag->u.serialnr.low;
638 system_serial_high = tag->u.serialnr.high;
639 return 0;
640}
641
642__tagtable(ATAG_SERIAL, parse_tag_serialnr);
643
644static int __init parse_tag_revision(const struct tag *tag)
645{
646 system_rev = tag->u.revision.rev;
647 return 0;
648}
649
650__tagtable(ATAG_REVISION, parse_tag_revision);
651
Alexander Holler92d20402010-02-16 19:04:53 +0100652#ifndef CONFIG_CMDLINE_FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653static int __init parse_tag_cmdline(const struct tag *tag)
654{
655 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
656 return 0;
657}
658
659__tagtable(ATAG_CMDLINE, parse_tag_cmdline);
Alexander Holler92d20402010-02-16 19:04:53 +0100660#endif /* CONFIG_CMDLINE_FORCE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
662/*
663 * Scan the tag table for this tag, and call its parse function.
664 * The tag table is built by the linker from all the __tagtable
665 * declarations.
666 */
667static int __init parse_tag(const struct tag *tag)
668{
669 extern struct tagtable __tagtable_begin, __tagtable_end;
670 struct tagtable *t;
671
672 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
673 if (tag->hdr.tag == t->tag) {
674 t->parse(tag);
675 break;
676 }
677
678 return t < &__tagtable_end;
679}
680
681/*
682 * Parse all tags in the list, checking both the global and architecture
683 * specific tag tables.
684 */
685static void __init parse_tags(const struct tag *t)
686{
687 for (; t->hdr.size; t = tag_next(t))
688 if (!parse_tag(t))
689 printk(KERN_WARNING
690 "Ignoring unrecognised tag 0x%08x\n",
691 t->hdr.tag);
692}
693
694/*
695 * This holds our defaults.
696 */
697static struct init_tags {
698 struct tag_header hdr1;
699 struct tag_core core;
700 struct tag_header hdr2;
701 struct tag_mem32 mem;
702 struct tag_header hdr3;
703} init_tags __initdata = {
704 { tag_size(tag_core), ATAG_CORE },
705 { 1, PAGE_SIZE, 0xff },
706 { tag_size(tag_mem32), ATAG_MEM },
707 { MEM_SIZE, PHYS_OFFSET },
708 { 0, ATAG_NONE }
709};
710
711static void (*init_machine)(void) __initdata;
712
713static int __init customize_machine(void)
714{
715 /* customizes platform devices, or adds new ones */
716 if (init_machine)
717 init_machine();
718 return 0;
719}
720arch_initcall(customize_machine);
721
Mika Westerberg3c57fb42010-05-10 09:20:22 +0100722#ifdef CONFIG_KEXEC
723static inline unsigned long long get_total_mem(void)
724{
725 unsigned long total;
726
727 total = max_low_pfn - min_low_pfn;
728 return total << PAGE_SHIFT;
729}
730
731/**
732 * reserve_crashkernel() - reserves memory are for crash kernel
733 *
734 * This function reserves memory area given in "crashkernel=" kernel command
735 * line parameter. The memory reserved is used by a dump capture kernel when
736 * primary kernel is crashing.
737 */
738static void __init reserve_crashkernel(void)
739{
740 unsigned long long crash_size, crash_base;
741 unsigned long long total_mem;
742 int ret;
743
744 total_mem = get_total_mem();
745 ret = parse_crashkernel(boot_command_line, total_mem,
746 &crash_size, &crash_base);
747 if (ret)
748 return;
749
750 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
751 if (ret < 0) {
752 printk(KERN_WARNING "crashkernel reservation failed - "
753 "memory is in use (0x%lx)\n", (unsigned long)crash_base);
754 return;
755 }
756
757 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
758 "for crashkernel (System RAM: %ldMB)\n",
759 (unsigned long)(crash_size >> 20),
760 (unsigned long)(crash_base >> 20),
761 (unsigned long)(total_mem >> 20));
762
763 crashk_res.start = crash_base;
764 crashk_res.end = crash_base + crash_size - 1;
765 insert_resource(&iomem_resource, &crashk_res);
766}
767#else
768static inline void reserve_crashkernel(void) {}
769#endif /* CONFIG_KEXEC */
770
Mika Westerbergcea0bb12010-05-10 09:29:32 +0100771/*
772 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
773 * is_kdump_kernel() to determine if we are booting after a panic. Hence
774 * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
775 */
776
777#ifdef CONFIG_CRASH_DUMP
778/*
779 * elfcorehdr= specifies the location of elf core header stored by the crashed
780 * kernel. This option will be passed by kexec loader to the capture kernel.
781 */
782static int __init setup_elfcorehdr(char *arg)
783{
784 char *end;
785
786 if (!arg)
787 return -EINVAL;
788
789 elfcorehdr_addr = memparse(arg, &end);
790 return end > arg ? 0 : -EINVAL;
791}
792early_param("elfcorehdr", setup_elfcorehdr);
793#endif /* CONFIG_CRASH_DUMP */
794
Uwe Kleine-König73a65b32010-01-19 10:13:14 +0100795static void __init squash_mem_tags(struct tag *tag)
796{
797 for (; tag->hdr.size; tag = tag_next(tag))
798 if (tag->hdr.tag == ATAG_MEM)
799 tag->hdr.tag = ATAG_NONE;
800}
801
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802void __init setup_arch(char **cmdline_p)
803{
804 struct tag *tags = (struct tag *)&init_tags;
805 struct machine_desc *mdesc;
806 char *from = default_command_line;
807
Catalin Marinasbff595c2009-02-16 11:41:36 +0100808 unwind_init();
809
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 setup_processor();
811 mdesc = setup_machine(machine_arch_type);
812 machine_name = mdesc->name;
813
814 if (mdesc->soft_reboot)
815 reboot_setup("s");
816
Bill Gatliff9d20fdd2007-05-31 22:02:22 +0100817 if (__atags_pointer)
818 tags = phys_to_virt(__atags_pointer);
819 else if (mdesc->boot_params)
Russell Kingf9bd6ea2005-07-04 10:43:36 +0100820 tags = phys_to_virt(mdesc->boot_params);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
Uwe Kleine-König73a65b32010-01-19 10:13:14 +0100822#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 /*
824 * If we have the old style parameters, convert them to
825 * a tag list.
826 */
827 if (tags->hdr.tag != ATAG_CORE)
828 convert_to_tag_list(tags);
Uwe Kleine-König73a65b32010-01-19 10:13:14 +0100829#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 if (tags->hdr.tag != ATAG_CORE)
831 tags = (struct tag *)&init_tags;
832
833 if (mdesc->fixup)
834 mdesc->fixup(mdesc, tags, &from, &meminfo);
835
836 if (tags->hdr.tag == ATAG_CORE) {
837 if (meminfo.nr_banks != 0)
838 squash_mem_tags(tags);
Richard Purdie4cd9d6f2008-01-02 00:56:46 +0100839 save_atags(tags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 parse_tags(tags);
841 }
842
Russell King37efe642008-12-01 11:53:07 +0000843 init_mm.start_code = (unsigned long) _text;
844 init_mm.end_code = (unsigned long) _etext;
845 init_mm.end_data = (unsigned long) _edata;
846 init_mm.brk = (unsigned long) _end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +0100848 /* parse_early_param needs a boot_command_line */
849 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
850
Jeremy Kerr48ab7e02010-01-27 01:13:31 +0100851 /* populate cmd_line too for later use, preserving boot_command_line */
852 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
853 *cmdline_p = cmd_line;
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +0100854
855 parse_early_param();
856
Russell King8d717a52010-05-22 19:47:18 +0100857 arm_memblock_init(&meminfo, mdesc);
Russell King2778f622010-07-09 16:27:52 +0100858
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -0400859 paging_init(mdesc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 request_standard_resources(&meminfo, mdesc);
861
Russell King7bbb7942006-02-16 11:08:09 +0000862#ifdef CONFIG_SMP
Russell Kingf00ec482010-09-04 10:47:48 +0100863 if (is_smp())
864 smp_init_cpus();
Russell King7bbb7942006-02-16 11:08:09 +0000865#endif
Mika Westerberg3c57fb42010-05-10 09:20:22 +0100866 reserve_crashkernel();
Russell King7bbb7942006-02-16 11:08:09 +0000867
Russell Kingccea7a12005-05-31 22:22:32 +0100868 cpu_init();
Linus Walleijbc581772009-09-15 17:30:37 +0100869 tcm_init();
Russell Kingccea7a12005-05-31 22:22:32 +0100870
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 /*
872 * Set up various architecture-specific pointers
873 */
eric miao354e6f72010-06-25 09:46:09 +0100874 arch_nr_irqs = mdesc->nr_irqs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 init_arch_irq = mdesc->init_irq;
876 system_timer = mdesc->timer;
877 init_machine = mdesc->init_machine;
878
879#ifdef CONFIG_VT
880#if defined(CONFIG_VGA_CONSOLE)
881 conswitchp = &vga_con;
882#elif defined(CONFIG_DUMMY_CONSOLE)
883 conswitchp = &dummy_con;
884#endif
885#endif
Jason Wessel5cbad0e2008-02-20 13:33:40 -0600886 early_trap_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
888
889
890static int __init topology_init(void)
891{
892 int cpu;
893
Russell King66fb8bd2007-03-13 09:54:21 +0000894 for_each_possible_cpu(cpu) {
895 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
896 cpuinfo->cpu.hotpluggable = 1;
897 register_cpu(&cpuinfo->cpu, cpu);
898 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
900 return 0;
901}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902subsys_initcall(topology_init);
903
Russell Kinge119bff2010-01-10 17:23:29 +0000904#ifdef CONFIG_HAVE_PROC_CPU
905static int __init proc_cpu_init(void)
906{
907 struct proc_dir_entry *res;
908
909 res = proc_mkdir("cpu", NULL);
910 if (!res)
911 return -ENOMEM;
912 return 0;
913}
914fs_initcall(proc_cpu_init);
915#endif
916
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917static const char *hwcap_str[] = {
918 "swp",
919 "half",
920 "thumb",
921 "26bit",
922 "fastmult",
923 "fpa",
924 "vfp",
925 "edsp",
926 "java",
Paul Gortmaker8f7f9432006-10-27 05:13:19 +0100927 "iwmmxt",
Lennert Buytenhek99e4a6d2006-12-18 00:59:10 +0100928 "crunch",
Catalin Marinas4369ae12008-11-06 13:23:06 +0000929 "thumbee",
Catalin Marinas2bedbdf2008-11-06 13:23:07 +0000930 "neon",
Catalin Marinas7279dc32009-02-11 13:13:56 +0100931 "vfpv3",
932 "vfpv3d16",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 NULL
934};
935
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936static int c_show(struct seq_file *m, void *v)
937{
938 int i;
939
940 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
Russell King0ba8b9b2008-08-10 18:08:10 +0100941 cpu_name, read_cpuid_id() & 15, elf_platform);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
943#if defined(CONFIG_SMP)
944 for_each_online_cpu(i) {
Russell King15559722005-11-06 21:41:08 +0000945 /*
946 * glibc reads /proc/cpuinfo to determine the number of
947 * online processors, looking for lines beginning with
948 * "processor". Give glibc what it expects.
949 */
950 seq_printf(m, "processor\t: %d\n", i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
952 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
953 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
954 }
955#else /* CONFIG_SMP */
956 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
957 loops_per_jiffy / (500000/HZ),
958 (loops_per_jiffy / (5000/HZ)) % 100);
959#endif
960
961 /* dump out the processor features */
962 seq_puts(m, "Features\t: ");
963
964 for (i = 0; hwcap_str[i]; i++)
965 if (elf_hwcap & (1 << i))
966 seq_printf(m, "%s ", hwcap_str[i]);
967
Russell King0ba8b9b2008-08-10 18:08:10 +0100968 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
970
Russell King0ba8b9b2008-08-10 18:08:10 +0100971 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 /* pre-ARM7 */
Russell King0ba8b9b2008-08-10 18:08:10 +0100973 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 } else {
Russell King0ba8b9b2008-08-10 18:08:10 +0100975 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 /* ARM7 */
977 seq_printf(m, "CPU variant\t: 0x%02x\n",
Russell King0ba8b9b2008-08-10 18:08:10 +0100978 (read_cpuid_id() >> 16) & 127);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 } else {
980 /* post-ARM7 */
981 seq_printf(m, "CPU variant\t: 0x%x\n",
Russell King0ba8b9b2008-08-10 18:08:10 +0100982 (read_cpuid_id() >> 20) & 15);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 }
984 seq_printf(m, "CPU part\t: 0x%03x\n",
Russell King0ba8b9b2008-08-10 18:08:10 +0100985 (read_cpuid_id() >> 4) & 0xfff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 }
Russell King0ba8b9b2008-08-10 18:08:10 +0100987 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 seq_puts(m, "\n");
990
991 seq_printf(m, "Hardware\t: %s\n", machine_name);
992 seq_printf(m, "Revision\t: %04x\n", system_rev);
993 seq_printf(m, "Serial\t\t: %08x%08x\n",
994 system_serial_high, system_serial_low);
995
996 return 0;
997}
998
999static void *c_start(struct seq_file *m, loff_t *pos)
1000{
1001 return *pos < 1 ? (void *)1 : NULL;
1002}
1003
1004static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1005{
1006 ++*pos;
1007 return NULL;
1008}
1009
1010static void c_stop(struct seq_file *m, void *v)
1011{
1012}
1013
Jan Engelhardt2ffd6e12008-01-22 20:41:07 +01001014const struct seq_operations cpuinfo_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 .start = c_start,
1016 .next = c_next,
1017 .stop = c_stop,
1018 .show = c_show
1019};