Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/setup.c | |
3 | * | |
4 | * Copyright (C) 1995-2001 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/stddef.h> | |
13 | #include <linux/ioport.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/utsname.h> | |
16 | #include <linux/initrd.h> | |
17 | #include <linux/console.h> | |
18 | #include <linux/bootmem.h> | |
19 | #include <linux/seq_file.h> | |
894673ee | 20 | #include <linux/screen_info.h> |
1da177e4 | 21 | #include <linux/init.h> |
3c57fb43 | 22 | #include <linux/kexec.h> |
cea0bb1b | 23 | #include <linux/crash_dump.h> |
1da177e4 LT |
24 | #include <linux/root_dev.h> |
25 | #include <linux/cpu.h> | |
26 | #include <linux/interrupt.h> | |
7bbb7940 | 27 | #include <linux/smp.h> |
4e950f6f | 28 | #include <linux/fs.h> |
e119bfff | 29 | #include <linux/proc_fs.h> |
2778f620 | 30 | #include <linux/memblock.h> |
1da177e4 | 31 | |
b86040a5 | 32 | #include <asm/unified.h> |
1da177e4 | 33 | #include <asm/cpu.h> |
0ba8b9b2 | 34 | #include <asm/cputype.h> |
1da177e4 | 35 | #include <asm/elf.h> |
1da177e4 | 36 | #include <asm/procinfo.h> |
37efe642 | 37 | #include <asm/sections.h> |
1da177e4 | 38 | #include <asm/setup.h> |
f00ec48f | 39 | #include <asm/smp_plat.h> |
1da177e4 LT |
40 | #include <asm/mach-types.h> |
41 | #include <asm/cacheflush.h> | |
46097c7d | 42 | #include <asm/cachetype.h> |
1da177e4 LT |
43 | #include <asm/tlbflush.h> |
44 | ||
45 | #include <asm/mach/arch.h> | |
46 | #include <asm/mach/irq.h> | |
47 | #include <asm/mach/time.h> | |
5cbad0eb | 48 | #include <asm/traps.h> |
bff595c1 | 49 | #include <asm/unwind.h> |
1da177e4 | 50 | |
73a65b3f | 51 | #if defined(CONFIG_DEPRECATED_PARAM_STRUCT) |
0fc1c832 | 52 | #include "compat.h" |
73a65b3f | 53 | #endif |
4cd9d6f7 | 54 | #include "atags.h" |
bc581770 | 55 | #include "tcm.h" |
0fc1c832 | 56 | |
1da177e4 LT |
57 | #ifndef MEM_SIZE |
58 | #define MEM_SIZE (16*1024*1024) | |
59 | #endif | |
60 | ||
61 | #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE) | |
62 | char fpe_type[8]; | |
63 | ||
64 | static 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 | ||
4b5f32ce | 73 | extern void paging_init(struct machine_desc *desc); |
1da177e4 | 74 | extern void reboot_setup(char *str); |
1da177e4 LT |
75 | |
76 | unsigned int processor_id; | |
c18f6581 | 77 | EXPORT_SYMBOL(processor_id); |
1da177e4 LT |
78 | unsigned int __machine_arch_type; |
79 | EXPORT_SYMBOL(__machine_arch_type); | |
c0e95878 RK |
80 | unsigned int cacheid; |
81 | EXPORT_SYMBOL(cacheid); | |
1da177e4 | 82 | |
9d20fdd5 BG |
83 | unsigned int __atags_pointer __initdata; |
84 | ||
1da177e4 LT |
85 | unsigned int system_rev; |
86 | EXPORT_SYMBOL(system_rev); | |
87 | ||
88 | unsigned int system_serial_low; | |
89 | EXPORT_SYMBOL(system_serial_low); | |
90 | ||
91 | unsigned int system_serial_high; | |
92 | EXPORT_SYMBOL(system_serial_high); | |
93 | ||
94 | unsigned int elf_hwcap; | |
95 | EXPORT_SYMBOL(elf_hwcap); | |
96 | ||
97 | ||
98 | #ifdef MULTI_CPU | |
99 | struct processor processor; | |
100 | #endif | |
101 | #ifdef MULTI_TLB | |
102 | struct cpu_tlb_fns cpu_tlb; | |
103 | #endif | |
104 | #ifdef MULTI_USER | |
105 | struct cpu_user_fns cpu_user; | |
106 | #endif | |
107 | #ifdef MULTI_CACHE | |
108 | struct cpu_cache_fns cpu_cache; | |
109 | #endif | |
953233dc CM |
110 | #ifdef CONFIG_OUTER_CACHE |
111 | struct outer_cache_fns outer_cache; | |
6c09f09d | 112 | EXPORT_SYMBOL(outer_cache); |
953233dc | 113 | #endif |
1da177e4 | 114 | |
ccea7a19 RK |
115 | struct stack { |
116 | u32 irq[3]; | |
117 | u32 abt[3]; | |
118 | u32 und[3]; | |
119 | } ____cacheline_aligned; | |
120 | ||
121 | static struct stack stacks[NR_CPUS]; | |
122 | ||
1da177e4 LT |
123 | char elf_platform[ELF_PLATFORM_SIZE]; |
124 | EXPORT_SYMBOL(elf_platform); | |
125 | ||
1da177e4 LT |
126 | static const char *cpu_name; |
127 | static const char *machine_name; | |
48ab7e09 | 128 | static char __initdata cmd_line[COMMAND_LINE_SIZE]; |
1da177e4 LT |
129 | |
130 | static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; | |
131 | static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } }; | |
132 | #define ENDIANNESS ((char)endian_test.l) | |
133 | ||
134 | DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data); | |
135 | ||
136 | /* | |
137 | * Standard memory resources | |
138 | */ | |
139 | static struct resource mem_res[] = { | |
740e518e GKH |
140 | { |
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 | } | |
1da177e4 LT |
158 | }; |
159 | ||
160 | #define video_ram mem_res[0] | |
161 | #define kernel_code mem_res[1] | |
162 | #define kernel_data mem_res[2] | |
163 | ||
164 | static struct resource io_res[] = { | |
740e518e GKH |
165 | { |
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 | } | |
1da177e4 LT |
183 | }; |
184 | ||
185 | #define lp0 io_res[0] | |
186 | #define lp1 io_res[1] | |
187 | #define lp2 io_res[2] | |
188 | ||
1da177e4 LT |
189 | static const char *proc_arch[] = { |
190 | "undefined/unknown", | |
191 | "3", | |
192 | "4", | |
193 | "4T", | |
194 | "5", | |
195 | "5T", | |
196 | "5TE", | |
197 | "5TEJ", | |
198 | "6TEJ", | |
6b090a25 | 199 | "7", |
1da177e4 LT |
200 | "?(11)", |
201 | "?(12)", | |
202 | "?(13)", | |
203 | "?(14)", | |
204 | "?(15)", | |
205 | "?(16)", | |
206 | "?(17)", | |
207 | }; | |
208 | ||
1da177e4 LT |
209 | int cpu_architecture(void) |
210 | { | |
211 | int cpu_arch; | |
212 | ||
0ba8b9b2 | 213 | if ((read_cpuid_id() & 0x0008f000) == 0) { |
1da177e4 | 214 | cpu_arch = CPU_ARCH_UNKNOWN; |
0ba8b9b2 RK |
215 | } 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; | |
1da177e4 LT |
219 | if (cpu_arch) |
220 | cpu_arch += CPU_ARCH_ARMv3; | |
0ba8b9b2 | 221 | } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) { |
180005c4 CM |
222 | 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; | |
1da177e4 LT |
238 | |
239 | return cpu_arch; | |
240 | } | |
241 | ||
c0e95878 RK |
242 | static void __init cacheid_init(void) |
243 | { | |
244 | unsigned int cachetype = read_cpuid_cachetype(); | |
245 | unsigned int arch = cpu_architecture(); | |
246 | ||
b57ee99f CM |
247 | if (arch >= CPU_ARCH_ARMv6) { |
248 | if ((cachetype & (7 << 29)) == 4 << 29) { | |
249 | /* ARMv7 register format */ | |
250 | cacheid = CACHEID_VIPT_NONALIASING; | |
251 | if ((cachetype & (3 << 14)) == 1 << 14) | |
252 | cacheid |= CACHEID_ASID_TAGGED; | |
253 | } else if (cachetype & (1 << 23)) | |
c0e95878 RK |
254 | cacheid = CACHEID_VIPT_ALIASING; |
255 | else | |
256 | cacheid = CACHEID_VIPT_NONALIASING; | |
257 | } else { | |
258 | cacheid = CACHEID_VIVT; | |
259 | } | |
2b4ae1f1 RK |
260 | |
261 | printk("CPU: %s data cache, %s instruction cache\n", | |
262 | cache_is_vivt() ? "VIVT" : | |
263 | cache_is_vipt_aliasing() ? "VIPT aliasing" : | |
264 | cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown", | |
265 | cache_is_vivt() ? "VIVT" : | |
266 | icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" : | |
267 | cache_is_vipt_aliasing() ? "VIPT aliasing" : | |
268 | cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown"); | |
c0e95878 RK |
269 | } |
270 | ||
1da177e4 LT |
271 | /* |
272 | * These functions re-use the assembly code in head.S, which | |
273 | * already provide the required functionality. | |
274 | */ | |
0f44ba1d | 275 | extern struct proc_info_list *lookup_processor_type(unsigned int); |
1da177e4 LT |
276 | extern struct machine_desc *lookup_machine_type(unsigned int); |
277 | ||
f159f4ed TL |
278 | static void __init feat_v6_fixup(void) |
279 | { | |
280 | int id = read_cpuid_id(); | |
281 | ||
282 | if ((id & 0xff0f0000) != 0x41070000) | |
283 | return; | |
284 | ||
285 | /* | |
286 | * HWCAP_TLS is available only on 1136 r1p0 and later, | |
287 | * see also kuser_get_tls_init. | |
288 | */ | |
289 | if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0)) | |
290 | elf_hwcap &= ~HWCAP_TLS; | |
291 | } | |
292 | ||
1da177e4 LT |
293 | static void __init setup_processor(void) |
294 | { | |
295 | struct proc_info_list *list; | |
296 | ||
297 | /* | |
298 | * locate processor in the list of supported processor | |
299 | * types. The linker builds this table for us from the | |
300 | * entries in arch/arm/mm/proc-*.S | |
301 | */ | |
0ba8b9b2 | 302 | list = lookup_processor_type(read_cpuid_id()); |
1da177e4 LT |
303 | if (!list) { |
304 | printk("CPU configuration botched (ID %08x), unable " | |
0ba8b9b2 | 305 | "to continue.\n", read_cpuid_id()); |
1da177e4 LT |
306 | while (1); |
307 | } | |
308 | ||
309 | cpu_name = list->cpu_name; | |
310 | ||
311 | #ifdef MULTI_CPU | |
312 | processor = *list->proc; | |
313 | #endif | |
314 | #ifdef MULTI_TLB | |
315 | cpu_tlb = *list->tlb; | |
316 | #endif | |
317 | #ifdef MULTI_USER | |
318 | cpu_user = *list->user; | |
319 | #endif | |
320 | #ifdef MULTI_CACHE | |
321 | cpu_cache = *list->cache; | |
322 | #endif | |
323 | ||
4e19025b | 324 | printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n", |
0ba8b9b2 | 325 | cpu_name, read_cpuid_id(), read_cpuid_id() & 15, |
264edb35 | 326 | proc_arch[cpu_architecture()], cr_alignment); |
1da177e4 | 327 | |
96b644bd | 328 | sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS); |
1da177e4 LT |
329 | sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS); |
330 | elf_hwcap = list->elf_hwcap; | |
adeff422 CM |
331 | #ifndef CONFIG_ARM_THUMB |
332 | elf_hwcap &= ~HWCAP_THUMB; | |
333 | #endif | |
1da177e4 | 334 | |
f159f4ed TL |
335 | feat_v6_fixup(); |
336 | ||
c0e95878 | 337 | cacheid_init(); |
1da177e4 LT |
338 | cpu_proc_init(); |
339 | } | |
340 | ||
ccea7a19 RK |
341 | /* |
342 | * cpu_init - initialise one CPU. | |
343 | * | |
90f1e084 | 344 | * cpu_init sets up the per-CPU stacks. |
ccea7a19 | 345 | */ |
36c5ed23 | 346 | void cpu_init(void) |
ccea7a19 RK |
347 | { |
348 | unsigned int cpu = smp_processor_id(); | |
349 | struct stack *stk = &stacks[cpu]; | |
350 | ||
351 | if (cpu >= NR_CPUS) { | |
352 | printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu); | |
353 | BUG(); | |
354 | } | |
355 | ||
b86040a5 CM |
356 | /* |
357 | * Define the placement constraint for the inline asm directive below. | |
358 | * In Thumb-2, msr with an immediate value is not allowed. | |
359 | */ | |
360 | #ifdef CONFIG_THUMB2_KERNEL | |
361 | #define PLC "r" | |
362 | #else | |
363 | #define PLC "I" | |
364 | #endif | |
365 | ||
ccea7a19 RK |
366 | /* |
367 | * setup stacks for re-entrant exception handlers | |
368 | */ | |
369 | __asm__ ( | |
370 | "msr cpsr_c, %1\n\t" | |
b86040a5 CM |
371 | "add r14, %0, %2\n\t" |
372 | "mov sp, r14\n\t" | |
ccea7a19 | 373 | "msr cpsr_c, %3\n\t" |
b86040a5 CM |
374 | "add r14, %0, %4\n\t" |
375 | "mov sp, r14\n\t" | |
ccea7a19 | 376 | "msr cpsr_c, %5\n\t" |
b86040a5 CM |
377 | "add r14, %0, %6\n\t" |
378 | "mov sp, r14\n\t" | |
ccea7a19 RK |
379 | "msr cpsr_c, %7" |
380 | : | |
381 | : "r" (stk), | |
b86040a5 | 382 | PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE), |
ccea7a19 | 383 | "I" (offsetof(struct stack, irq[0])), |
b86040a5 | 384 | PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE), |
ccea7a19 | 385 | "I" (offsetof(struct stack, abt[0])), |
b86040a5 | 386 | PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE), |
ccea7a19 | 387 | "I" (offsetof(struct stack, und[0])), |
b86040a5 | 388 | PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE) |
aaaa3f9e | 389 | : "r14"); |
ccea7a19 RK |
390 | } |
391 | ||
1da177e4 LT |
392 | static struct machine_desc * __init setup_machine(unsigned int nr) |
393 | { | |
394 | struct machine_desc *list; | |
395 | ||
396 | /* | |
397 | * locate machine in the list of supported machines. | |
398 | */ | |
399 | list = lookup_machine_type(nr); | |
400 | if (!list) { | |
401 | printk("Machine configuration botched (nr %d), unable " | |
402 | "to continue.\n", nr); | |
403 | while (1); | |
404 | } | |
405 | ||
406 | printk("Machine: %s\n", list->name); | |
407 | ||
408 | return list; | |
409 | } | |
410 | ||
4b5f32ce | 411 | static int __init arm_add_memory(unsigned long start, unsigned long size) |
3a669411 | 412 | { |
4b5f32ce NP |
413 | struct membank *bank = &meminfo.bank[meminfo.nr_banks]; |
414 | ||
415 | if (meminfo.nr_banks >= NR_BANKS) { | |
416 | printk(KERN_CRIT "NR_BANKS too low, " | |
417 | "ignoring memory at %#lx\n", start); | |
418 | return -EINVAL; | |
419 | } | |
05f96ef1 | 420 | |
3a669411 RK |
421 | /* |
422 | * Ensure that start/size are aligned to a page boundary. | |
423 | * Size is appropriately rounded down, start is rounded up. | |
424 | */ | |
425 | size -= start & ~PAGE_MASK; | |
05f96ef1 RK |
426 | bank->start = PAGE_ALIGN(start); |
427 | bank->size = size & PAGE_MASK; | |
4b5f32ce NP |
428 | |
429 | /* | |
430 | * Check whether this memory region has non-zero size or | |
431 | * invalid node number. | |
432 | */ | |
be370302 | 433 | if (bank->size == 0) |
4b5f32ce NP |
434 | return -EINVAL; |
435 | ||
436 | meminfo.nr_banks++; | |
437 | return 0; | |
3a669411 RK |
438 | } |
439 | ||
1da177e4 LT |
440 | /* |
441 | * Pick out the memory size. We look for mem=size@start, | |
442 | * where start and size are "size[KkMm]" | |
443 | */ | |
2b0d8c25 | 444 | static int __init early_mem(char *p) |
1da177e4 LT |
445 | { |
446 | static int usermem __initdata = 0; | |
447 | unsigned long size, start; | |
2b0d8c25 | 448 | char *endp; |
1da177e4 LT |
449 | |
450 | /* | |
451 | * If the user specifies memory size, we | |
452 | * blow away any automatically generated | |
453 | * size. | |
454 | */ | |
455 | if (usermem == 0) { | |
456 | usermem = 1; | |
457 | meminfo.nr_banks = 0; | |
458 | } | |
459 | ||
460 | start = PHYS_OFFSET; | |
2b0d8c25 JK |
461 | size = memparse(p, &endp); |
462 | if (*endp == '@') | |
463 | start = memparse(endp + 1, NULL); | |
1da177e4 | 464 | |
1c97b73e | 465 | arm_add_memory(start, size); |
1da177e4 | 466 | |
2b0d8c25 | 467 | return 0; |
1da177e4 | 468 | } |
2b0d8c25 | 469 | early_param("mem", early_mem); |
1da177e4 LT |
470 | |
471 | static void __init | |
472 | setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz) | |
473 | { | |
474 | #ifdef CONFIG_BLK_DEV_RAM | |
475 | extern int rd_size, rd_image_start, rd_prompt, rd_doload; | |
476 | ||
477 | rd_image_start = image_start; | |
478 | rd_prompt = prompt; | |
479 | rd_doload = doload; | |
480 | ||
481 | if (rd_sz) | |
482 | rd_size = rd_sz; | |
483 | #endif | |
484 | } | |
485 | ||
486 | static void __init | |
487 | request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc) | |
488 | { | |
489 | struct resource *res; | |
490 | int i; | |
491 | ||
37efe642 RK |
492 | kernel_code.start = virt_to_phys(_text); |
493 | kernel_code.end = virt_to_phys(_etext - 1); | |
494 | kernel_data.start = virt_to_phys(_data); | |
495 | kernel_data.end = virt_to_phys(_end - 1); | |
1da177e4 LT |
496 | |
497 | for (i = 0; i < mi->nr_banks; i++) { | |
1da177e4 LT |
498 | if (mi->bank[i].size == 0) |
499 | continue; | |
500 | ||
1da177e4 LT |
501 | res = alloc_bootmem_low(sizeof(*res)); |
502 | res->name = "System RAM"; | |
3319f5e5 NP |
503 | res->start = mi->bank[i].start; |
504 | res->end = mi->bank[i].start + mi->bank[i].size - 1; | |
1da177e4 LT |
505 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
506 | ||
507 | request_resource(&iomem_resource, res); | |
508 | ||
509 | if (kernel_code.start >= res->start && | |
510 | kernel_code.end <= res->end) | |
511 | request_resource(res, &kernel_code); | |
512 | if (kernel_data.start >= res->start && | |
513 | kernel_data.end <= res->end) | |
514 | request_resource(res, &kernel_data); | |
515 | } | |
516 | ||
517 | if (mdesc->video_start) { | |
518 | video_ram.start = mdesc->video_start; | |
519 | video_ram.end = mdesc->video_end; | |
520 | request_resource(&iomem_resource, &video_ram); | |
521 | } | |
522 | ||
523 | /* | |
524 | * Some machines don't have the possibility of ever | |
525 | * possessing lp0, lp1 or lp2 | |
526 | */ | |
527 | if (mdesc->reserve_lp0) | |
528 | request_resource(&ioport_resource, &lp0); | |
529 | if (mdesc->reserve_lp1) | |
530 | request_resource(&ioport_resource, &lp1); | |
531 | if (mdesc->reserve_lp2) | |
532 | request_resource(&ioport_resource, &lp2); | |
533 | } | |
534 | ||
535 | /* | |
536 | * Tag parsing. | |
537 | * | |
538 | * This is the new way of passing data to the kernel at boot time. Rather | |
539 | * than passing a fixed inflexible structure to the kernel, we pass a list | |
540 | * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE | |
541 | * tag for the list to be recognised (to distinguish the tagged list from | |
542 | * a param_struct). The list is terminated with a zero-length tag (this tag | |
543 | * is not parsed in any way). | |
544 | */ | |
545 | static int __init parse_tag_core(const struct tag *tag) | |
546 | { | |
547 | if (tag->hdr.size > 2) { | |
548 | if ((tag->u.core.flags & 1) == 0) | |
549 | root_mountflags &= ~MS_RDONLY; | |
550 | ROOT_DEV = old_decode_dev(tag->u.core.rootdev); | |
551 | } | |
552 | return 0; | |
553 | } | |
554 | ||
555 | __tagtable(ATAG_CORE, parse_tag_core); | |
556 | ||
557 | static int __init parse_tag_mem32(const struct tag *tag) | |
558 | { | |
4b5f32ce | 559 | return arm_add_memory(tag->u.mem.start, tag->u.mem.size); |
1da177e4 LT |
560 | } |
561 | ||
562 | __tagtable(ATAG_MEM, parse_tag_mem32); | |
563 | ||
564 | #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) | |
565 | struct screen_info screen_info = { | |
566 | .orig_video_lines = 30, | |
567 | .orig_video_cols = 80, | |
568 | .orig_video_mode = 0, | |
569 | .orig_video_ega_bx = 0, | |
570 | .orig_video_isVGA = 1, | |
571 | .orig_video_points = 8 | |
572 | }; | |
573 | ||
574 | static int __init parse_tag_videotext(const struct tag *tag) | |
575 | { | |
576 | screen_info.orig_x = tag->u.videotext.x; | |
577 | screen_info.orig_y = tag->u.videotext.y; | |
578 | screen_info.orig_video_page = tag->u.videotext.video_page; | |
579 | screen_info.orig_video_mode = tag->u.videotext.video_mode; | |
580 | screen_info.orig_video_cols = tag->u.videotext.video_cols; | |
581 | screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx; | |
582 | screen_info.orig_video_lines = tag->u.videotext.video_lines; | |
583 | screen_info.orig_video_isVGA = tag->u.videotext.video_isvga; | |
584 | screen_info.orig_video_points = tag->u.videotext.video_points; | |
585 | return 0; | |
586 | } | |
587 | ||
588 | __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext); | |
589 | #endif | |
590 | ||
591 | static int __init parse_tag_ramdisk(const struct tag *tag) | |
592 | { | |
593 | setup_ramdisk((tag->u.ramdisk.flags & 1) == 0, | |
594 | (tag->u.ramdisk.flags & 2) == 0, | |
595 | tag->u.ramdisk.start, tag->u.ramdisk.size); | |
596 | return 0; | |
597 | } | |
598 | ||
599 | __tagtable(ATAG_RAMDISK, parse_tag_ramdisk); | |
600 | ||
1da177e4 LT |
601 | static int __init parse_tag_serialnr(const struct tag *tag) |
602 | { | |
603 | system_serial_low = tag->u.serialnr.low; | |
604 | system_serial_high = tag->u.serialnr.high; | |
605 | return 0; | |
606 | } | |
607 | ||
608 | __tagtable(ATAG_SERIAL, parse_tag_serialnr); | |
609 | ||
610 | static int __init parse_tag_revision(const struct tag *tag) | |
611 | { | |
612 | system_rev = tag->u.revision.rev; | |
613 | return 0; | |
614 | } | |
615 | ||
616 | __tagtable(ATAG_REVISION, parse_tag_revision); | |
617 | ||
92d2040d | 618 | #ifndef CONFIG_CMDLINE_FORCE |
1da177e4 LT |
619 | static int __init parse_tag_cmdline(const struct tag *tag) |
620 | { | |
621 | strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE); | |
622 | return 0; | |
623 | } | |
624 | ||
625 | __tagtable(ATAG_CMDLINE, parse_tag_cmdline); | |
92d2040d | 626 | #endif /* CONFIG_CMDLINE_FORCE */ |
1da177e4 LT |
627 | |
628 | /* | |
629 | * Scan the tag table for this tag, and call its parse function. | |
630 | * The tag table is built by the linker from all the __tagtable | |
631 | * declarations. | |
632 | */ | |
633 | static int __init parse_tag(const struct tag *tag) | |
634 | { | |
635 | extern struct tagtable __tagtable_begin, __tagtable_end; | |
636 | struct tagtable *t; | |
637 | ||
638 | for (t = &__tagtable_begin; t < &__tagtable_end; t++) | |
639 | if (tag->hdr.tag == t->tag) { | |
640 | t->parse(tag); | |
641 | break; | |
642 | } | |
643 | ||
644 | return t < &__tagtable_end; | |
645 | } | |
646 | ||
647 | /* | |
648 | * Parse all tags in the list, checking both the global and architecture | |
649 | * specific tag tables. | |
650 | */ | |
651 | static void __init parse_tags(const struct tag *t) | |
652 | { | |
653 | for (; t->hdr.size; t = tag_next(t)) | |
654 | if (!parse_tag(t)) | |
655 | printk(KERN_WARNING | |
656 | "Ignoring unrecognised tag 0x%08x\n", | |
657 | t->hdr.tag); | |
658 | } | |
659 | ||
660 | /* | |
661 | * This holds our defaults. | |
662 | */ | |
663 | static struct init_tags { | |
664 | struct tag_header hdr1; | |
665 | struct tag_core core; | |
666 | struct tag_header hdr2; | |
667 | struct tag_mem32 mem; | |
668 | struct tag_header hdr3; | |
669 | } init_tags __initdata = { | |
670 | { tag_size(tag_core), ATAG_CORE }, | |
671 | { 1, PAGE_SIZE, 0xff }, | |
672 | { tag_size(tag_mem32), ATAG_MEM }, | |
673 | { MEM_SIZE, PHYS_OFFSET }, | |
674 | { 0, ATAG_NONE } | |
675 | }; | |
676 | ||
677 | static void (*init_machine)(void) __initdata; | |
678 | ||
679 | static int __init customize_machine(void) | |
680 | { | |
681 | /* customizes platform devices, or adds new ones */ | |
682 | if (init_machine) | |
683 | init_machine(); | |
684 | return 0; | |
685 | } | |
686 | arch_initcall(customize_machine); | |
687 | ||
3c57fb43 MW |
688 | #ifdef CONFIG_KEXEC |
689 | static inline unsigned long long get_total_mem(void) | |
690 | { | |
691 | unsigned long total; | |
692 | ||
693 | total = max_low_pfn - min_low_pfn; | |
694 | return total << PAGE_SHIFT; | |
695 | } | |
696 | ||
697 | /** | |
698 | * reserve_crashkernel() - reserves memory are for crash kernel | |
699 | * | |
700 | * This function reserves memory area given in "crashkernel=" kernel command | |
701 | * line parameter. The memory reserved is used by a dump capture kernel when | |
702 | * primary kernel is crashing. | |
703 | */ | |
704 | static void __init reserve_crashkernel(void) | |
705 | { | |
706 | unsigned long long crash_size, crash_base; | |
707 | unsigned long long total_mem; | |
708 | int ret; | |
709 | ||
710 | total_mem = get_total_mem(); | |
711 | ret = parse_crashkernel(boot_command_line, total_mem, | |
712 | &crash_size, &crash_base); | |
713 | if (ret) | |
714 | return; | |
715 | ||
716 | ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE); | |
717 | if (ret < 0) { | |
718 | printk(KERN_WARNING "crashkernel reservation failed - " | |
719 | "memory is in use (0x%lx)\n", (unsigned long)crash_base); | |
720 | return; | |
721 | } | |
722 | ||
723 | printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " | |
724 | "for crashkernel (System RAM: %ldMB)\n", | |
725 | (unsigned long)(crash_size >> 20), | |
726 | (unsigned long)(crash_base >> 20), | |
727 | (unsigned long)(total_mem >> 20)); | |
728 | ||
729 | crashk_res.start = crash_base; | |
730 | crashk_res.end = crash_base + crash_size - 1; | |
731 | insert_resource(&iomem_resource, &crashk_res); | |
732 | } | |
733 | #else | |
734 | static inline void reserve_crashkernel(void) {} | |
735 | #endif /* CONFIG_KEXEC */ | |
736 | ||
cea0bb1b MW |
737 | /* |
738 | * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by | |
739 | * is_kdump_kernel() to determine if we are booting after a panic. Hence | |
740 | * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE. | |
741 | */ | |
742 | ||
743 | #ifdef CONFIG_CRASH_DUMP | |
744 | /* | |
745 | * elfcorehdr= specifies the location of elf core header stored by the crashed | |
746 | * kernel. This option will be passed by kexec loader to the capture kernel. | |
747 | */ | |
748 | static int __init setup_elfcorehdr(char *arg) | |
749 | { | |
750 | char *end; | |
751 | ||
752 | if (!arg) | |
753 | return -EINVAL; | |
754 | ||
755 | elfcorehdr_addr = memparse(arg, &end); | |
756 | return end > arg ? 0 : -EINVAL; | |
757 | } | |
758 | early_param("elfcorehdr", setup_elfcorehdr); | |
759 | #endif /* CONFIG_CRASH_DUMP */ | |
760 | ||
73a65b3f UKK |
761 | static void __init squash_mem_tags(struct tag *tag) |
762 | { | |
763 | for (; tag->hdr.size; tag = tag_next(tag)) | |
764 | if (tag->hdr.tag == ATAG_MEM) | |
765 | tag->hdr.tag = ATAG_NONE; | |
766 | } | |
767 | ||
1da177e4 LT |
768 | void __init setup_arch(char **cmdline_p) |
769 | { | |
770 | struct tag *tags = (struct tag *)&init_tags; | |
771 | struct machine_desc *mdesc; | |
772 | char *from = default_command_line; | |
773 | ||
bff595c1 CM |
774 | unwind_init(); |
775 | ||
1da177e4 LT |
776 | setup_processor(); |
777 | mdesc = setup_machine(machine_arch_type); | |
778 | machine_name = mdesc->name; | |
779 | ||
780 | if (mdesc->soft_reboot) | |
781 | reboot_setup("s"); | |
782 | ||
9d20fdd5 BG |
783 | if (__atags_pointer) |
784 | tags = phys_to_virt(__atags_pointer); | |
785 | else if (mdesc->boot_params) | |
f9bd6ea4 | 786 | tags = phys_to_virt(mdesc->boot_params); |
1da177e4 | 787 | |
73a65b3f | 788 | #if defined(CONFIG_DEPRECATED_PARAM_STRUCT) |
1da177e4 LT |
789 | /* |
790 | * If we have the old style parameters, convert them to | |
791 | * a tag list. | |
792 | */ | |
793 | if (tags->hdr.tag != ATAG_CORE) | |
794 | convert_to_tag_list(tags); | |
73a65b3f | 795 | #endif |
1da177e4 LT |
796 | if (tags->hdr.tag != ATAG_CORE) |
797 | tags = (struct tag *)&init_tags; | |
798 | ||
799 | if (mdesc->fixup) | |
800 | mdesc->fixup(mdesc, tags, &from, &meminfo); | |
801 | ||
802 | if (tags->hdr.tag == ATAG_CORE) { | |
803 | if (meminfo.nr_banks != 0) | |
804 | squash_mem_tags(tags); | |
4cd9d6f7 | 805 | save_atags(tags); |
1da177e4 LT |
806 | parse_tags(tags); |
807 | } | |
808 | ||
37efe642 RK |
809 | init_mm.start_code = (unsigned long) _text; |
810 | init_mm.end_code = (unsigned long) _etext; | |
811 | init_mm.end_data = (unsigned long) _edata; | |
812 | init_mm.brk = (unsigned long) _end; | |
1da177e4 | 813 | |
2b0d8c25 JK |
814 | /* parse_early_param needs a boot_command_line */ |
815 | strlcpy(boot_command_line, from, COMMAND_LINE_SIZE); | |
816 | ||
48ab7e09 JK |
817 | /* populate cmd_line too for later use, preserving boot_command_line */ |
818 | strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); | |
819 | *cmdline_p = cmd_line; | |
2b0d8c25 JK |
820 | |
821 | parse_early_param(); | |
822 | ||
8d717a52 | 823 | arm_memblock_init(&meminfo, mdesc); |
2778f620 | 824 | |
4b5f32ce | 825 | paging_init(mdesc); |
1da177e4 LT |
826 | request_standard_resources(&meminfo, mdesc); |
827 | ||
7bbb7940 | 828 | #ifdef CONFIG_SMP |
f00ec48f RK |
829 | if (is_smp()) |
830 | smp_init_cpus(); | |
7bbb7940 | 831 | #endif |
3c57fb43 | 832 | reserve_crashkernel(); |
7bbb7940 | 833 | |
ccea7a19 | 834 | cpu_init(); |
bc581770 | 835 | tcm_init(); |
ccea7a19 | 836 | |
1da177e4 LT |
837 | /* |
838 | * Set up various architecture-specific pointers | |
839 | */ | |
354e6f72 | 840 | arch_nr_irqs = mdesc->nr_irqs; |
1da177e4 LT |
841 | init_arch_irq = mdesc->init_irq; |
842 | system_timer = mdesc->timer; | |
843 | init_machine = mdesc->init_machine; | |
844 | ||
845 | #ifdef CONFIG_VT | |
846 | #if defined(CONFIG_VGA_CONSOLE) | |
847 | conswitchp = &vga_con; | |
848 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
849 | conswitchp = &dummy_con; | |
850 | #endif | |
851 | #endif | |
5cbad0eb | 852 | early_trap_init(); |
1da177e4 LT |
853 | } |
854 | ||
855 | ||
856 | static int __init topology_init(void) | |
857 | { | |
858 | int cpu; | |
859 | ||
66fb8bd2 RK |
860 | for_each_possible_cpu(cpu) { |
861 | struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu); | |
862 | cpuinfo->cpu.hotpluggable = 1; | |
863 | register_cpu(&cpuinfo->cpu, cpu); | |
864 | } | |
1da177e4 LT |
865 | |
866 | return 0; | |
867 | } | |
1da177e4 LT |
868 | subsys_initcall(topology_init); |
869 | ||
e119bfff RK |
870 | #ifdef CONFIG_HAVE_PROC_CPU |
871 | static int __init proc_cpu_init(void) | |
872 | { | |
873 | struct proc_dir_entry *res; | |
874 | ||
875 | res = proc_mkdir("cpu", NULL); | |
876 | if (!res) | |
877 | return -ENOMEM; | |
878 | return 0; | |
879 | } | |
880 | fs_initcall(proc_cpu_init); | |
881 | #endif | |
882 | ||
1da177e4 LT |
883 | static const char *hwcap_str[] = { |
884 | "swp", | |
885 | "half", | |
886 | "thumb", | |
887 | "26bit", | |
888 | "fastmult", | |
889 | "fpa", | |
890 | "vfp", | |
891 | "edsp", | |
892 | "java", | |
8f7f9435 | 893 | "iwmmxt", |
99e4a6dd | 894 | "crunch", |
4369ae16 | 895 | "thumbee", |
2bedbdf4 | 896 | "neon", |
7279dc3e CM |
897 | "vfpv3", |
898 | "vfpv3d16", | |
1da177e4 LT |
899 | NULL |
900 | }; | |
901 | ||
1da177e4 LT |
902 | static int c_show(struct seq_file *m, void *v) |
903 | { | |
904 | int i; | |
905 | ||
906 | seq_printf(m, "Processor\t: %s rev %d (%s)\n", | |
0ba8b9b2 | 907 | cpu_name, read_cpuid_id() & 15, elf_platform); |
1da177e4 LT |
908 | |
909 | #if defined(CONFIG_SMP) | |
910 | for_each_online_cpu(i) { | |
15559722 RK |
911 | /* |
912 | * glibc reads /proc/cpuinfo to determine the number of | |
913 | * online processors, looking for lines beginning with | |
914 | * "processor". Give glibc what it expects. | |
915 | */ | |
916 | seq_printf(m, "processor\t: %d\n", i); | |
1da177e4 LT |
917 | seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n", |
918 | per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ), | |
919 | (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100); | |
920 | } | |
921 | #else /* CONFIG_SMP */ | |
922 | seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", | |
923 | loops_per_jiffy / (500000/HZ), | |
924 | (loops_per_jiffy / (5000/HZ)) % 100); | |
925 | #endif | |
926 | ||
927 | /* dump out the processor features */ | |
928 | seq_puts(m, "Features\t: "); | |
929 | ||
930 | for (i = 0; hwcap_str[i]; i++) | |
931 | if (elf_hwcap & (1 << i)) | |
932 | seq_printf(m, "%s ", hwcap_str[i]); | |
933 | ||
0ba8b9b2 | 934 | seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); |
1da177e4 LT |
935 | seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]); |
936 | ||
0ba8b9b2 | 937 | if ((read_cpuid_id() & 0x0008f000) == 0x00000000) { |
1da177e4 | 938 | /* pre-ARM7 */ |
0ba8b9b2 | 939 | seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4); |
1da177e4 | 940 | } else { |
0ba8b9b2 | 941 | if ((read_cpuid_id() & 0x0008f000) == 0x00007000) { |
1da177e4 LT |
942 | /* ARM7 */ |
943 | seq_printf(m, "CPU variant\t: 0x%02x\n", | |
0ba8b9b2 | 944 | (read_cpuid_id() >> 16) & 127); |
1da177e4 LT |
945 | } else { |
946 | /* post-ARM7 */ | |
947 | seq_printf(m, "CPU variant\t: 0x%x\n", | |
0ba8b9b2 | 948 | (read_cpuid_id() >> 20) & 15); |
1da177e4 LT |
949 | } |
950 | seq_printf(m, "CPU part\t: 0x%03x\n", | |
0ba8b9b2 | 951 | (read_cpuid_id() >> 4) & 0xfff); |
1da177e4 | 952 | } |
0ba8b9b2 | 953 | seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); |
1da177e4 | 954 | |
1da177e4 LT |
955 | seq_puts(m, "\n"); |
956 | ||
957 | seq_printf(m, "Hardware\t: %s\n", machine_name); | |
958 | seq_printf(m, "Revision\t: %04x\n", system_rev); | |
959 | seq_printf(m, "Serial\t\t: %08x%08x\n", | |
960 | system_serial_high, system_serial_low); | |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
965 | static void *c_start(struct seq_file *m, loff_t *pos) | |
966 | { | |
967 | return *pos < 1 ? (void *)1 : NULL; | |
968 | } | |
969 | ||
970 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
971 | { | |
972 | ++*pos; | |
973 | return NULL; | |
974 | } | |
975 | ||
976 | static void c_stop(struct seq_file *m, void *v) | |
977 | { | |
978 | } | |
979 | ||
2ffd6e18 | 980 | const struct seq_operations cpuinfo_op = { |
1da177e4 LT |
981 | .start = c_start, |
982 | .next = c_next, | |
983 | .stop = c_stop, | |
984 | .show = c_show | |
985 | }; |