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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); |
0385ebc0 | 78 | unsigned int __machine_arch_type __read_mostly; |
1da177e4 | 79 | EXPORT_SYMBOL(__machine_arch_type); |
0385ebc0 | 80 | unsigned int cacheid __read_mostly; |
c0e95878 | 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 | ||
0385ebc0 | 94 | unsigned int elf_hwcap __read_mostly; |
1da177e4 LT |
95 | EXPORT_SYMBOL(elf_hwcap); |
96 | ||
97 | ||
98 | #ifdef MULTI_CPU | |
0385ebc0 | 99 | struct processor processor __read_mostly; |
1da177e4 LT |
100 | #endif |
101 | #ifdef MULTI_TLB | |
0385ebc0 | 102 | struct cpu_tlb_fns cpu_tlb __read_mostly; |
1da177e4 LT |
103 | #endif |
104 | #ifdef MULTI_USER | |
0385ebc0 | 105 | struct cpu_user_fns cpu_user __read_mostly; |
1da177e4 LT |
106 | #endif |
107 | #ifdef MULTI_CACHE | |
0385ebc0 | 108 | struct cpu_cache_fns cpu_cache __read_mostly; |
1da177e4 | 109 | #endif |
953233dc | 110 | #ifdef CONFIG_OUTER_CACHE |
0385ebc0 | 111 | struct outer_cache_fns outer_cache __read_mostly; |
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]; |
8ff1443c | 129 | struct machine_desc *machine_desc __initdata; |
1da177e4 LT |
130 | |
131 | static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; | |
132 | static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } }; | |
133 | #define ENDIANNESS ((char)endian_test.l) | |
134 | ||
135 | DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data); | |
136 | ||
137 | /* | |
138 | * Standard memory resources | |
139 | */ | |
140 | static struct resource mem_res[] = { | |
740e518e GKH |
141 | { |
142 | .name = "Video RAM", | |
143 | .start = 0, | |
144 | .end = 0, | |
145 | .flags = IORESOURCE_MEM | |
146 | }, | |
147 | { | |
148 | .name = "Kernel text", | |
149 | .start = 0, | |
150 | .end = 0, | |
151 | .flags = IORESOURCE_MEM | |
152 | }, | |
153 | { | |
154 | .name = "Kernel data", | |
155 | .start = 0, | |
156 | .end = 0, | |
157 | .flags = IORESOURCE_MEM | |
158 | } | |
1da177e4 LT |
159 | }; |
160 | ||
161 | #define video_ram mem_res[0] | |
162 | #define kernel_code mem_res[1] | |
163 | #define kernel_data mem_res[2] | |
164 | ||
165 | static struct resource io_res[] = { | |
740e518e GKH |
166 | { |
167 | .name = "reserved", | |
168 | .start = 0x3bc, | |
169 | .end = 0x3be, | |
170 | .flags = IORESOURCE_IO | IORESOURCE_BUSY | |
171 | }, | |
172 | { | |
173 | .name = "reserved", | |
174 | .start = 0x378, | |
175 | .end = 0x37f, | |
176 | .flags = IORESOURCE_IO | IORESOURCE_BUSY | |
177 | }, | |
178 | { | |
179 | .name = "reserved", | |
180 | .start = 0x278, | |
181 | .end = 0x27f, | |
182 | .flags = IORESOURCE_IO | IORESOURCE_BUSY | |
183 | } | |
1da177e4 LT |
184 | }; |
185 | ||
186 | #define lp0 io_res[0] | |
187 | #define lp1 io_res[1] | |
188 | #define lp2 io_res[2] | |
189 | ||
1da177e4 LT |
190 | static const char *proc_arch[] = { |
191 | "undefined/unknown", | |
192 | "3", | |
193 | "4", | |
194 | "4T", | |
195 | "5", | |
196 | "5T", | |
197 | "5TE", | |
198 | "5TEJ", | |
199 | "6TEJ", | |
6b090a25 | 200 | "7", |
1da177e4 LT |
201 | "?(11)", |
202 | "?(12)", | |
203 | "?(13)", | |
204 | "?(14)", | |
205 | "?(15)", | |
206 | "?(16)", | |
207 | "?(17)", | |
208 | }; | |
209 | ||
1da177e4 LT |
210 | int cpu_architecture(void) |
211 | { | |
212 | int cpu_arch; | |
213 | ||
0ba8b9b2 | 214 | if ((read_cpuid_id() & 0x0008f000) == 0) { |
1da177e4 | 215 | cpu_arch = CPU_ARCH_UNKNOWN; |
0ba8b9b2 RK |
216 | } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) { |
217 | cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3; | |
218 | } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) { | |
219 | cpu_arch = (read_cpuid_id() >> 16) & 7; | |
1da177e4 LT |
220 | if (cpu_arch) |
221 | cpu_arch += CPU_ARCH_ARMv3; | |
0ba8b9b2 | 222 | } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) { |
180005c4 CM |
223 | unsigned int mmfr0; |
224 | ||
225 | /* Revised CPUID format. Read the Memory Model Feature | |
226 | * Register 0 and check for VMSAv7 or PMSAv7 */ | |
227 | asm("mrc p15, 0, %0, c0, c1, 4" | |
228 | : "=r" (mmfr0)); | |
315cfe78 CM |
229 | if ((mmfr0 & 0x0000000f) >= 0x00000003 || |
230 | (mmfr0 & 0x000000f0) >= 0x00000030) | |
180005c4 CM |
231 | cpu_arch = CPU_ARCH_ARMv7; |
232 | else if ((mmfr0 & 0x0000000f) == 0x00000002 || | |
233 | (mmfr0 & 0x000000f0) == 0x00000020) | |
234 | cpu_arch = CPU_ARCH_ARMv6; | |
235 | else | |
236 | cpu_arch = CPU_ARCH_UNKNOWN; | |
237 | } else | |
238 | cpu_arch = CPU_ARCH_UNKNOWN; | |
1da177e4 LT |
239 | |
240 | return cpu_arch; | |
241 | } | |
242 | ||
8925ec4c WD |
243 | static int cpu_has_aliasing_icache(unsigned int arch) |
244 | { | |
245 | int aliasing_icache; | |
246 | unsigned int id_reg, num_sets, line_size; | |
247 | ||
248 | /* arch specifies the register format */ | |
249 | switch (arch) { | |
250 | case CPU_ARCH_ARMv7: | |
5fb31a96 LW |
251 | asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR" |
252 | : /* No output operands */ | |
8925ec4c | 253 | : "r" (1)); |
5fb31a96 LW |
254 | isb(); |
255 | asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR" | |
256 | : "=r" (id_reg)); | |
8925ec4c WD |
257 | line_size = 4 << ((id_reg & 0x7) + 2); |
258 | num_sets = ((id_reg >> 13) & 0x7fff) + 1; | |
259 | aliasing_icache = (line_size * num_sets) > PAGE_SIZE; | |
260 | break; | |
261 | case CPU_ARCH_ARMv6: | |
262 | aliasing_icache = read_cpuid_cachetype() & (1 << 11); | |
263 | break; | |
264 | default: | |
265 | /* I-cache aliases will be handled by D-cache aliasing code */ | |
266 | aliasing_icache = 0; | |
267 | } | |
268 | ||
269 | return aliasing_icache; | |
270 | } | |
271 | ||
c0e95878 RK |
272 | static void __init cacheid_init(void) |
273 | { | |
274 | unsigned int cachetype = read_cpuid_cachetype(); | |
275 | unsigned int arch = cpu_architecture(); | |
276 | ||
b57ee99f CM |
277 | if (arch >= CPU_ARCH_ARMv6) { |
278 | if ((cachetype & (7 << 29)) == 4 << 29) { | |
279 | /* ARMv7 register format */ | |
280 | cacheid = CACHEID_VIPT_NONALIASING; | |
281 | if ((cachetype & (3 << 14)) == 1 << 14) | |
282 | cacheid |= CACHEID_ASID_TAGGED; | |
8925ec4c WD |
283 | else if (cpu_has_aliasing_icache(CPU_ARCH_ARMv7)) |
284 | cacheid |= CACHEID_VIPT_I_ALIASING; | |
285 | } else if (cachetype & (1 << 23)) { | |
c0e95878 | 286 | cacheid = CACHEID_VIPT_ALIASING; |
8925ec4c | 287 | } else { |
c0e95878 | 288 | cacheid = CACHEID_VIPT_NONALIASING; |
8925ec4c WD |
289 | if (cpu_has_aliasing_icache(CPU_ARCH_ARMv6)) |
290 | cacheid |= CACHEID_VIPT_I_ALIASING; | |
291 | } | |
c0e95878 RK |
292 | } else { |
293 | cacheid = CACHEID_VIVT; | |
294 | } | |
2b4ae1f1 RK |
295 | |
296 | printk("CPU: %s data cache, %s instruction cache\n", | |
297 | cache_is_vivt() ? "VIVT" : | |
298 | cache_is_vipt_aliasing() ? "VIPT aliasing" : | |
299 | cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown", | |
300 | cache_is_vivt() ? "VIVT" : | |
301 | icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" : | |
8925ec4c | 302 | icache_is_vipt_aliasing() ? "VIPT aliasing" : |
2b4ae1f1 | 303 | cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown"); |
c0e95878 RK |
304 | } |
305 | ||
1da177e4 LT |
306 | /* |
307 | * These functions re-use the assembly code in head.S, which | |
308 | * already provide the required functionality. | |
309 | */ | |
0f44ba1d | 310 | extern struct proc_info_list *lookup_processor_type(unsigned int); |
6fc31d54 RK |
311 | |
312 | static void __init early_print(const char *str, ...) | |
313 | { | |
314 | extern void printascii(const char *); | |
315 | char buf[256]; | |
316 | va_list ap; | |
317 | ||
318 | va_start(ap, str); | |
319 | vsnprintf(buf, sizeof(buf), str, ap); | |
320 | va_end(ap); | |
321 | ||
322 | #ifdef CONFIG_DEBUG_LL | |
323 | printascii(buf); | |
324 | #endif | |
325 | printk("%s", buf); | |
326 | } | |
327 | ||
f159f4ed TL |
328 | static void __init feat_v6_fixup(void) |
329 | { | |
330 | int id = read_cpuid_id(); | |
331 | ||
332 | if ((id & 0xff0f0000) != 0x41070000) | |
333 | return; | |
334 | ||
335 | /* | |
336 | * HWCAP_TLS is available only on 1136 r1p0 and later, | |
337 | * see also kuser_get_tls_init. | |
338 | */ | |
339 | if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0)) | |
340 | elf_hwcap &= ~HWCAP_TLS; | |
341 | } | |
342 | ||
1da177e4 LT |
343 | static void __init setup_processor(void) |
344 | { | |
345 | struct proc_info_list *list; | |
346 | ||
347 | /* | |
348 | * locate processor in the list of supported processor | |
349 | * types. The linker builds this table for us from the | |
350 | * entries in arch/arm/mm/proc-*.S | |
351 | */ | |
0ba8b9b2 | 352 | list = lookup_processor_type(read_cpuid_id()); |
1da177e4 LT |
353 | if (!list) { |
354 | printk("CPU configuration botched (ID %08x), unable " | |
0ba8b9b2 | 355 | "to continue.\n", read_cpuid_id()); |
1da177e4 LT |
356 | while (1); |
357 | } | |
358 | ||
359 | cpu_name = list->cpu_name; | |
360 | ||
361 | #ifdef MULTI_CPU | |
362 | processor = *list->proc; | |
363 | #endif | |
364 | #ifdef MULTI_TLB | |
365 | cpu_tlb = *list->tlb; | |
366 | #endif | |
367 | #ifdef MULTI_USER | |
368 | cpu_user = *list->user; | |
369 | #endif | |
370 | #ifdef MULTI_CACHE | |
371 | cpu_cache = *list->cache; | |
372 | #endif | |
373 | ||
4e19025b | 374 | printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n", |
0ba8b9b2 | 375 | cpu_name, read_cpuid_id(), read_cpuid_id() & 15, |
264edb35 | 376 | proc_arch[cpu_architecture()], cr_alignment); |
1da177e4 | 377 | |
96b644bd | 378 | sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS); |
1da177e4 LT |
379 | sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS); |
380 | elf_hwcap = list->elf_hwcap; | |
adeff422 CM |
381 | #ifndef CONFIG_ARM_THUMB |
382 | elf_hwcap &= ~HWCAP_THUMB; | |
383 | #endif | |
1da177e4 | 384 | |
f159f4ed TL |
385 | feat_v6_fixup(); |
386 | ||
c0e95878 | 387 | cacheid_init(); |
1da177e4 LT |
388 | cpu_proc_init(); |
389 | } | |
390 | ||
ccea7a19 RK |
391 | /* |
392 | * cpu_init - initialise one CPU. | |
393 | * | |
90f1e084 | 394 | * cpu_init sets up the per-CPU stacks. |
ccea7a19 | 395 | */ |
36c5ed23 | 396 | void cpu_init(void) |
ccea7a19 RK |
397 | { |
398 | unsigned int cpu = smp_processor_id(); | |
399 | struct stack *stk = &stacks[cpu]; | |
400 | ||
401 | if (cpu >= NR_CPUS) { | |
402 | printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu); | |
403 | BUG(); | |
404 | } | |
405 | ||
b86040a5 CM |
406 | /* |
407 | * Define the placement constraint for the inline asm directive below. | |
408 | * In Thumb-2, msr with an immediate value is not allowed. | |
409 | */ | |
410 | #ifdef CONFIG_THUMB2_KERNEL | |
411 | #define PLC "r" | |
412 | #else | |
413 | #define PLC "I" | |
414 | #endif | |
415 | ||
ccea7a19 RK |
416 | /* |
417 | * setup stacks for re-entrant exception handlers | |
418 | */ | |
419 | __asm__ ( | |
420 | "msr cpsr_c, %1\n\t" | |
b86040a5 CM |
421 | "add r14, %0, %2\n\t" |
422 | "mov sp, r14\n\t" | |
ccea7a19 | 423 | "msr cpsr_c, %3\n\t" |
b86040a5 CM |
424 | "add r14, %0, %4\n\t" |
425 | "mov sp, r14\n\t" | |
ccea7a19 | 426 | "msr cpsr_c, %5\n\t" |
b86040a5 CM |
427 | "add r14, %0, %6\n\t" |
428 | "mov sp, r14\n\t" | |
ccea7a19 RK |
429 | "msr cpsr_c, %7" |
430 | : | |
431 | : "r" (stk), | |
b86040a5 | 432 | PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE), |
ccea7a19 | 433 | "I" (offsetof(struct stack, irq[0])), |
b86040a5 | 434 | PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE), |
ccea7a19 | 435 | "I" (offsetof(struct stack, abt[0])), |
b86040a5 | 436 | PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE), |
ccea7a19 | 437 | "I" (offsetof(struct stack, und[0])), |
b86040a5 | 438 | PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE) |
aaaa3f9e | 439 | : "r14"); |
ccea7a19 RK |
440 | } |
441 | ||
6291319d | 442 | static void __init dump_machine_table(void) |
1da177e4 | 443 | { |
dce72dd0 | 444 | struct machine_desc *p; |
1da177e4 | 445 | |
6291319d GL |
446 | early_print("Available machine support:\n\nID (hex)\tNAME\n"); |
447 | for_each_machine_desc(p) | |
dce72dd0 | 448 | early_print("%08x\t%s\n", p->nr, p->name); |
1da177e4 | 449 | |
dce72dd0 | 450 | early_print("\nPlease check your kernel config and/or bootloader.\n"); |
1da177e4 | 451 | |
dce72dd0 NP |
452 | while (true) |
453 | /* can't use cpu_relax() here as it may require MMU setup */; | |
1da177e4 LT |
454 | } |
455 | ||
9eb8f674 | 456 | int __init arm_add_memory(phys_addr_t start, unsigned long size) |
3a669411 | 457 | { |
4b5f32ce NP |
458 | struct membank *bank = &meminfo.bank[meminfo.nr_banks]; |
459 | ||
460 | if (meminfo.nr_banks >= NR_BANKS) { | |
461 | printk(KERN_CRIT "NR_BANKS too low, " | |
29a38193 | 462 | "ignoring memory at 0x%08llx\n", (long long)start); |
4b5f32ce NP |
463 | return -EINVAL; |
464 | } | |
05f96ef1 | 465 | |
3a669411 RK |
466 | /* |
467 | * Ensure that start/size are aligned to a page boundary. | |
468 | * Size is appropriately rounded down, start is rounded up. | |
469 | */ | |
470 | size -= start & ~PAGE_MASK; | |
05f96ef1 RK |
471 | bank->start = PAGE_ALIGN(start); |
472 | bank->size = size & PAGE_MASK; | |
4b5f32ce NP |
473 | |
474 | /* | |
475 | * Check whether this memory region has non-zero size or | |
476 | * invalid node number. | |
477 | */ | |
be370302 | 478 | if (bank->size == 0) |
4b5f32ce NP |
479 | return -EINVAL; |
480 | ||
481 | meminfo.nr_banks++; | |
482 | return 0; | |
3a669411 RK |
483 | } |
484 | ||
1da177e4 LT |
485 | /* |
486 | * Pick out the memory size. We look for mem=size@start, | |
487 | * where start and size are "size[KkMm]" | |
488 | */ | |
2b0d8c25 | 489 | static int __init early_mem(char *p) |
1da177e4 LT |
490 | { |
491 | static int usermem __initdata = 0; | |
f60892d3 WD |
492 | unsigned long size; |
493 | phys_addr_t start; | |
2b0d8c25 | 494 | char *endp; |
1da177e4 LT |
495 | |
496 | /* | |
497 | * If the user specifies memory size, we | |
498 | * blow away any automatically generated | |
499 | * size. | |
500 | */ | |
501 | if (usermem == 0) { | |
502 | usermem = 1; | |
503 | meminfo.nr_banks = 0; | |
504 | } | |
505 | ||
506 | start = PHYS_OFFSET; | |
2b0d8c25 JK |
507 | size = memparse(p, &endp); |
508 | if (*endp == '@') | |
509 | start = memparse(endp + 1, NULL); | |
1da177e4 | 510 | |
1c97b73e | 511 | arm_add_memory(start, size); |
1da177e4 | 512 | |
2b0d8c25 | 513 | return 0; |
1da177e4 | 514 | } |
2b0d8c25 | 515 | early_param("mem", early_mem); |
1da177e4 LT |
516 | |
517 | static void __init | |
518 | setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz) | |
519 | { | |
520 | #ifdef CONFIG_BLK_DEV_RAM | |
521 | extern int rd_size, rd_image_start, rd_prompt, rd_doload; | |
522 | ||
523 | rd_image_start = image_start; | |
524 | rd_prompt = prompt; | |
525 | rd_doload = doload; | |
526 | ||
527 | if (rd_sz) | |
528 | rd_size = rd_sz; | |
529 | #endif | |
530 | } | |
531 | ||
11b9369c | 532 | static void __init request_standard_resources(struct machine_desc *mdesc) |
1da177e4 | 533 | { |
11b9369c | 534 | struct memblock_region *region; |
1da177e4 | 535 | struct resource *res; |
1da177e4 | 536 | |
37efe642 RK |
537 | kernel_code.start = virt_to_phys(_text); |
538 | kernel_code.end = virt_to_phys(_etext - 1); | |
842eab40 | 539 | kernel_data.start = virt_to_phys(_sdata); |
37efe642 | 540 | kernel_data.end = virt_to_phys(_end - 1); |
1da177e4 | 541 | |
11b9369c | 542 | for_each_memblock(memory, region) { |
1da177e4 LT |
543 | res = alloc_bootmem_low(sizeof(*res)); |
544 | res->name = "System RAM"; | |
11b9369c DZ |
545 | res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); |
546 | res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; | |
1da177e4 LT |
547 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
548 | ||
549 | request_resource(&iomem_resource, res); | |
550 | ||
551 | if (kernel_code.start >= res->start && | |
552 | kernel_code.end <= res->end) | |
553 | request_resource(res, &kernel_code); | |
554 | if (kernel_data.start >= res->start && | |
555 | kernel_data.end <= res->end) | |
556 | request_resource(res, &kernel_data); | |
557 | } | |
558 | ||
559 | if (mdesc->video_start) { | |
560 | video_ram.start = mdesc->video_start; | |
561 | video_ram.end = mdesc->video_end; | |
562 | request_resource(&iomem_resource, &video_ram); | |
563 | } | |
564 | ||
565 | /* | |
566 | * Some machines don't have the possibility of ever | |
567 | * possessing lp0, lp1 or lp2 | |
568 | */ | |
569 | if (mdesc->reserve_lp0) | |
570 | request_resource(&ioport_resource, &lp0); | |
571 | if (mdesc->reserve_lp1) | |
572 | request_resource(&ioport_resource, &lp1); | |
573 | if (mdesc->reserve_lp2) | |
574 | request_resource(&ioport_resource, &lp2); | |
575 | } | |
576 | ||
577 | /* | |
578 | * Tag parsing. | |
579 | * | |
580 | * This is the new way of passing data to the kernel at boot time. Rather | |
581 | * than passing a fixed inflexible structure to the kernel, we pass a list | |
582 | * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE | |
583 | * tag for the list to be recognised (to distinguish the tagged list from | |
584 | * a param_struct). The list is terminated with a zero-length tag (this tag | |
585 | * is not parsed in any way). | |
586 | */ | |
587 | static int __init parse_tag_core(const struct tag *tag) | |
588 | { | |
589 | if (tag->hdr.size > 2) { | |
590 | if ((tag->u.core.flags & 1) == 0) | |
591 | root_mountflags &= ~MS_RDONLY; | |
592 | ROOT_DEV = old_decode_dev(tag->u.core.rootdev); | |
593 | } | |
594 | return 0; | |
595 | } | |
596 | ||
597 | __tagtable(ATAG_CORE, parse_tag_core); | |
598 | ||
599 | static int __init parse_tag_mem32(const struct tag *tag) | |
600 | { | |
4b5f32ce | 601 | return arm_add_memory(tag->u.mem.start, tag->u.mem.size); |
1da177e4 LT |
602 | } |
603 | ||
604 | __tagtable(ATAG_MEM, parse_tag_mem32); | |
605 | ||
606 | #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) | |
607 | struct screen_info screen_info = { | |
608 | .orig_video_lines = 30, | |
609 | .orig_video_cols = 80, | |
610 | .orig_video_mode = 0, | |
611 | .orig_video_ega_bx = 0, | |
612 | .orig_video_isVGA = 1, | |
613 | .orig_video_points = 8 | |
614 | }; | |
615 | ||
616 | static int __init parse_tag_videotext(const struct tag *tag) | |
617 | { | |
618 | screen_info.orig_x = tag->u.videotext.x; | |
619 | screen_info.orig_y = tag->u.videotext.y; | |
620 | screen_info.orig_video_page = tag->u.videotext.video_page; | |
621 | screen_info.orig_video_mode = tag->u.videotext.video_mode; | |
622 | screen_info.orig_video_cols = tag->u.videotext.video_cols; | |
623 | screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx; | |
624 | screen_info.orig_video_lines = tag->u.videotext.video_lines; | |
625 | screen_info.orig_video_isVGA = tag->u.videotext.video_isvga; | |
626 | screen_info.orig_video_points = tag->u.videotext.video_points; | |
627 | return 0; | |
628 | } | |
629 | ||
630 | __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext); | |
631 | #endif | |
632 | ||
633 | static int __init parse_tag_ramdisk(const struct tag *tag) | |
634 | { | |
635 | setup_ramdisk((tag->u.ramdisk.flags & 1) == 0, | |
636 | (tag->u.ramdisk.flags & 2) == 0, | |
637 | tag->u.ramdisk.start, tag->u.ramdisk.size); | |
638 | return 0; | |
639 | } | |
640 | ||
641 | __tagtable(ATAG_RAMDISK, parse_tag_ramdisk); | |
642 | ||
1da177e4 LT |
643 | static int __init parse_tag_serialnr(const struct tag *tag) |
644 | { | |
645 | system_serial_low = tag->u.serialnr.low; | |
646 | system_serial_high = tag->u.serialnr.high; | |
647 | return 0; | |
648 | } | |
649 | ||
650 | __tagtable(ATAG_SERIAL, parse_tag_serialnr); | |
651 | ||
652 | static int __init parse_tag_revision(const struct tag *tag) | |
653 | { | |
654 | system_rev = tag->u.revision.rev; | |
655 | return 0; | |
656 | } | |
657 | ||
658 | __tagtable(ATAG_REVISION, parse_tag_revision); | |
659 | ||
660 | static int __init parse_tag_cmdline(const struct tag *tag) | |
661 | { | |
22eeb8f6 | 662 | #ifndef CONFIG_CMDLINE_FORCE |
1da177e4 | 663 | strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE); |
22eeb8f6 AH |
664 | #else |
665 | pr_warning("Ignoring tag cmdline (using the default kernel command line)\n"); | |
666 | #endif /* CONFIG_CMDLINE_FORCE */ | |
1da177e4 LT |
667 | return 0; |
668 | } | |
669 | ||
670 | __tagtable(ATAG_CMDLINE, parse_tag_cmdline); | |
671 | ||
672 | /* | |
673 | * Scan the tag table for this tag, and call its parse function. | |
674 | * The tag table is built by the linker from all the __tagtable | |
675 | * declarations. | |
676 | */ | |
677 | static int __init parse_tag(const struct tag *tag) | |
678 | { | |
679 | extern struct tagtable __tagtable_begin, __tagtable_end; | |
680 | struct tagtable *t; | |
681 | ||
682 | for (t = &__tagtable_begin; t < &__tagtable_end; t++) | |
683 | if (tag->hdr.tag == t->tag) { | |
684 | t->parse(tag); | |
685 | break; | |
686 | } | |
687 | ||
688 | return t < &__tagtable_end; | |
689 | } | |
690 | ||
691 | /* | |
692 | * Parse all tags in the list, checking both the global and architecture | |
693 | * specific tag tables. | |
694 | */ | |
695 | static void __init parse_tags(const struct tag *t) | |
696 | { | |
697 | for (; t->hdr.size; t = tag_next(t)) | |
698 | if (!parse_tag(t)) | |
699 | printk(KERN_WARNING | |
700 | "Ignoring unrecognised tag 0x%08x\n", | |
701 | t->hdr.tag); | |
702 | } | |
703 | ||
704 | /* | |
705 | * This holds our defaults. | |
706 | */ | |
707 | static struct init_tags { | |
708 | struct tag_header hdr1; | |
709 | struct tag_core core; | |
710 | struct tag_header hdr2; | |
711 | struct tag_mem32 mem; | |
712 | struct tag_header hdr3; | |
713 | } init_tags __initdata = { | |
714 | { tag_size(tag_core), ATAG_CORE }, | |
715 | { 1, PAGE_SIZE, 0xff }, | |
716 | { tag_size(tag_mem32), ATAG_MEM }, | |
b75c178a | 717 | { MEM_SIZE }, |
1da177e4 LT |
718 | { 0, ATAG_NONE } |
719 | }; | |
720 | ||
1da177e4 LT |
721 | static int __init customize_machine(void) |
722 | { | |
723 | /* customizes platform devices, or adds new ones */ | |
8ff1443c RK |
724 | if (machine_desc->init_machine) |
725 | machine_desc->init_machine(); | |
1da177e4 LT |
726 | return 0; |
727 | } | |
728 | arch_initcall(customize_machine); | |
729 | ||
3c57fb43 MW |
730 | #ifdef CONFIG_KEXEC |
731 | static inline unsigned long long get_total_mem(void) | |
732 | { | |
733 | unsigned long total; | |
734 | ||
735 | total = max_low_pfn - min_low_pfn; | |
736 | return total << PAGE_SHIFT; | |
737 | } | |
738 | ||
739 | /** | |
740 | * reserve_crashkernel() - reserves memory are for crash kernel | |
741 | * | |
742 | * This function reserves memory area given in "crashkernel=" kernel command | |
743 | * line parameter. The memory reserved is used by a dump capture kernel when | |
744 | * primary kernel is crashing. | |
745 | */ | |
746 | static void __init reserve_crashkernel(void) | |
747 | { | |
748 | unsigned long long crash_size, crash_base; | |
749 | unsigned long long total_mem; | |
750 | int ret; | |
751 | ||
752 | total_mem = get_total_mem(); | |
753 | ret = parse_crashkernel(boot_command_line, total_mem, | |
754 | &crash_size, &crash_base); | |
755 | if (ret) | |
756 | return; | |
757 | ||
758 | ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE); | |
759 | if (ret < 0) { | |
760 | printk(KERN_WARNING "crashkernel reservation failed - " | |
761 | "memory is in use (0x%lx)\n", (unsigned long)crash_base); | |
762 | return; | |
763 | } | |
764 | ||
765 | printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " | |
766 | "for crashkernel (System RAM: %ldMB)\n", | |
767 | (unsigned long)(crash_size >> 20), | |
768 | (unsigned long)(crash_base >> 20), | |
769 | (unsigned long)(total_mem >> 20)); | |
770 | ||
771 | crashk_res.start = crash_base; | |
772 | crashk_res.end = crash_base + crash_size - 1; | |
773 | insert_resource(&iomem_resource, &crashk_res); | |
774 | } | |
775 | #else | |
776 | static inline void reserve_crashkernel(void) {} | |
777 | #endif /* CONFIG_KEXEC */ | |
778 | ||
73a65b3f UKK |
779 | static void __init squash_mem_tags(struct tag *tag) |
780 | { | |
781 | for (; tag->hdr.size; tag = tag_next(tag)) | |
782 | if (tag->hdr.tag == ATAG_MEM) | |
783 | tag->hdr.tag = ATAG_NONE; | |
784 | } | |
785 | ||
6291319d | 786 | static struct machine_desc * __init setup_machine_tags(unsigned int nr) |
1da177e4 LT |
787 | { |
788 | struct tag *tags = (struct tag *)&init_tags; | |
6291319d | 789 | struct machine_desc *mdesc = NULL, *p; |
1da177e4 LT |
790 | char *from = default_command_line; |
791 | ||
b75c178a RK |
792 | init_tags.mem.start = PHYS_OFFSET; |
793 | ||
6291319d GL |
794 | /* |
795 | * locate machine in the list of supported machines. | |
796 | */ | |
797 | for_each_machine_desc(p) | |
798 | if (nr == p->nr) { | |
799 | printk("Machine: %s\n", p->name); | |
800 | mdesc = p; | |
801 | break; | |
802 | } | |
1da177e4 | 803 | |
6291319d GL |
804 | if (!mdesc) { |
805 | early_print("\nError: unrecognized/unsupported machine ID" | |
806 | " (r1 = 0x%08x).\n\n", nr); | |
807 | dump_machine_table(); /* does not return */ | |
808 | } | |
1da177e4 | 809 | |
9d20fdd5 BG |
810 | if (__atags_pointer) |
811 | tags = phys_to_virt(__atags_pointer); | |
3572bea8 NP |
812 | else if (mdesc->boot_params) { |
813 | #ifdef CONFIG_MMU | |
814 | /* | |
815 | * We still are executing with a minimal MMU mapping created | |
816 | * with the presumption that the machine default for this | |
817 | * is located in the first MB of RAM. Anything else will | |
818 | * fault and silently hang the kernel at this point. | |
819 | */ | |
820 | if (mdesc->boot_params < PHYS_OFFSET || | |
821 | mdesc->boot_params >= PHYS_OFFSET + SZ_1M) { | |
822 | printk(KERN_WARNING | |
823 | "Default boot params at physical 0x%08lx out of reach\n", | |
824 | mdesc->boot_params); | |
825 | } else | |
826 | #endif | |
827 | { | |
828 | tags = phys_to_virt(mdesc->boot_params); | |
829 | } | |
830 | } | |
1da177e4 | 831 | |
73a65b3f | 832 | #if defined(CONFIG_DEPRECATED_PARAM_STRUCT) |
1da177e4 LT |
833 | /* |
834 | * If we have the old style parameters, convert them to | |
835 | * a tag list. | |
836 | */ | |
837 | if (tags->hdr.tag != ATAG_CORE) | |
838 | convert_to_tag_list(tags); | |
73a65b3f | 839 | #endif |
1da177e4 LT |
840 | if (tags->hdr.tag != ATAG_CORE) |
841 | tags = (struct tag *)&init_tags; | |
842 | ||
843 | if (mdesc->fixup) | |
844 | mdesc->fixup(mdesc, tags, &from, &meminfo); | |
845 | ||
846 | if (tags->hdr.tag == ATAG_CORE) { | |
847 | if (meminfo.nr_banks != 0) | |
848 | squash_mem_tags(tags); | |
4cd9d6f7 | 849 | save_atags(tags); |
1da177e4 LT |
850 | parse_tags(tags); |
851 | } | |
852 | ||
6291319d GL |
853 | /* parse_early_param needs a boot_command_line */ |
854 | strlcpy(boot_command_line, from, COMMAND_LINE_SIZE); | |
855 | ||
856 | return mdesc; | |
857 | } | |
858 | ||
859 | ||
860 | void __init setup_arch(char **cmdline_p) | |
861 | { | |
862 | struct machine_desc *mdesc; | |
863 | ||
864 | unwind_init(); | |
865 | ||
866 | setup_processor(); | |
867 | mdesc = setup_machine_tags(machine_arch_type); | |
868 | machine_desc = mdesc; | |
869 | machine_name = mdesc->name; | |
870 | ||
871 | if (mdesc->soft_reboot) | |
872 | reboot_setup("s"); | |
873 | ||
37efe642 RK |
874 | init_mm.start_code = (unsigned long) _text; |
875 | init_mm.end_code = (unsigned long) _etext; | |
876 | init_mm.end_data = (unsigned long) _edata; | |
877 | init_mm.brk = (unsigned long) _end; | |
1da177e4 | 878 | |
48ab7e09 JK |
879 | /* populate cmd_line too for later use, preserving boot_command_line */ |
880 | strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); | |
881 | *cmdline_p = cmd_line; | |
2b0d8c25 JK |
882 | |
883 | parse_early_param(); | |
884 | ||
8d717a52 | 885 | arm_memblock_init(&meminfo, mdesc); |
2778f620 | 886 | |
4b5f32ce | 887 | paging_init(mdesc); |
11b9369c | 888 | request_standard_resources(mdesc); |
1da177e4 | 889 | |
7bbb7940 | 890 | #ifdef CONFIG_SMP |
f00ec48f RK |
891 | if (is_smp()) |
892 | smp_init_cpus(); | |
7bbb7940 | 893 | #endif |
3c57fb43 | 894 | reserve_crashkernel(); |
7bbb7940 | 895 | |
ccea7a19 | 896 | cpu_init(); |
bc581770 | 897 | tcm_init(); |
ccea7a19 | 898 | |
52108641 | 899 | #ifdef CONFIG_MULTI_IRQ_HANDLER |
900 | handle_arch_irq = mdesc->handle_irq; | |
901 | #endif | |
1da177e4 LT |
902 | |
903 | #ifdef CONFIG_VT | |
904 | #if defined(CONFIG_VGA_CONSOLE) | |
905 | conswitchp = &vga_con; | |
906 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
907 | conswitchp = &dummy_con; | |
908 | #endif | |
909 | #endif | |
5cbad0eb | 910 | early_trap_init(); |
dec12e62 RK |
911 | |
912 | if (mdesc->init_early) | |
913 | mdesc->init_early(); | |
1da177e4 LT |
914 | } |
915 | ||
916 | ||
917 | static int __init topology_init(void) | |
918 | { | |
919 | int cpu; | |
920 | ||
66fb8bd2 RK |
921 | for_each_possible_cpu(cpu) { |
922 | struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu); | |
923 | cpuinfo->cpu.hotpluggable = 1; | |
924 | register_cpu(&cpuinfo->cpu, cpu); | |
925 | } | |
1da177e4 LT |
926 | |
927 | return 0; | |
928 | } | |
1da177e4 LT |
929 | subsys_initcall(topology_init); |
930 | ||
e119bfff RK |
931 | #ifdef CONFIG_HAVE_PROC_CPU |
932 | static int __init proc_cpu_init(void) | |
933 | { | |
934 | struct proc_dir_entry *res; | |
935 | ||
936 | res = proc_mkdir("cpu", NULL); | |
937 | if (!res) | |
938 | return -ENOMEM; | |
939 | return 0; | |
940 | } | |
941 | fs_initcall(proc_cpu_init); | |
942 | #endif | |
943 | ||
1da177e4 LT |
944 | static const char *hwcap_str[] = { |
945 | "swp", | |
946 | "half", | |
947 | "thumb", | |
948 | "26bit", | |
949 | "fastmult", | |
950 | "fpa", | |
951 | "vfp", | |
952 | "edsp", | |
953 | "java", | |
8f7f9435 | 954 | "iwmmxt", |
99e4a6dd | 955 | "crunch", |
4369ae16 | 956 | "thumbee", |
2bedbdf4 | 957 | "neon", |
7279dc3e CM |
958 | "vfpv3", |
959 | "vfpv3d16", | |
1da177e4 LT |
960 | NULL |
961 | }; | |
962 | ||
1da177e4 LT |
963 | static int c_show(struct seq_file *m, void *v) |
964 | { | |
965 | int i; | |
966 | ||
967 | seq_printf(m, "Processor\t: %s rev %d (%s)\n", | |
0ba8b9b2 | 968 | cpu_name, read_cpuid_id() & 15, elf_platform); |
1da177e4 LT |
969 | |
970 | #if defined(CONFIG_SMP) | |
971 | for_each_online_cpu(i) { | |
15559722 RK |
972 | /* |
973 | * glibc reads /proc/cpuinfo to determine the number of | |
974 | * online processors, looking for lines beginning with | |
975 | * "processor". Give glibc what it expects. | |
976 | */ | |
977 | seq_printf(m, "processor\t: %d\n", i); | |
1da177e4 LT |
978 | seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n", |
979 | per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ), | |
980 | (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100); | |
981 | } | |
982 | #else /* CONFIG_SMP */ | |
983 | seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", | |
984 | loops_per_jiffy / (500000/HZ), | |
985 | (loops_per_jiffy / (5000/HZ)) % 100); | |
986 | #endif | |
987 | ||
988 | /* dump out the processor features */ | |
989 | seq_puts(m, "Features\t: "); | |
990 | ||
991 | for (i = 0; hwcap_str[i]; i++) | |
992 | if (elf_hwcap & (1 << i)) | |
993 | seq_printf(m, "%s ", hwcap_str[i]); | |
994 | ||
0ba8b9b2 | 995 | seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); |
1da177e4 LT |
996 | seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]); |
997 | ||
0ba8b9b2 | 998 | if ((read_cpuid_id() & 0x0008f000) == 0x00000000) { |
1da177e4 | 999 | /* pre-ARM7 */ |
0ba8b9b2 | 1000 | seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4); |
1da177e4 | 1001 | } else { |
0ba8b9b2 | 1002 | if ((read_cpuid_id() & 0x0008f000) == 0x00007000) { |
1da177e4 LT |
1003 | /* ARM7 */ |
1004 | seq_printf(m, "CPU variant\t: 0x%02x\n", | |
0ba8b9b2 | 1005 | (read_cpuid_id() >> 16) & 127); |
1da177e4 LT |
1006 | } else { |
1007 | /* post-ARM7 */ | |
1008 | seq_printf(m, "CPU variant\t: 0x%x\n", | |
0ba8b9b2 | 1009 | (read_cpuid_id() >> 20) & 15); |
1da177e4 LT |
1010 | } |
1011 | seq_printf(m, "CPU part\t: 0x%03x\n", | |
0ba8b9b2 | 1012 | (read_cpuid_id() >> 4) & 0xfff); |
1da177e4 | 1013 | } |
0ba8b9b2 | 1014 | seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); |
1da177e4 | 1015 | |
1da177e4 LT |
1016 | seq_puts(m, "\n"); |
1017 | ||
1018 | seq_printf(m, "Hardware\t: %s\n", machine_name); | |
1019 | seq_printf(m, "Revision\t: %04x\n", system_rev); | |
1020 | seq_printf(m, "Serial\t\t: %08x%08x\n", | |
1021 | system_serial_high, system_serial_low); | |
1022 | ||
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | static void *c_start(struct seq_file *m, loff_t *pos) | |
1027 | { | |
1028 | return *pos < 1 ? (void *)1 : NULL; | |
1029 | } | |
1030 | ||
1031 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
1032 | { | |
1033 | ++*pos; | |
1034 | return NULL; | |
1035 | } | |
1036 | ||
1037 | static void c_stop(struct seq_file *m, void *v) | |
1038 | { | |
1039 | } | |
1040 | ||
2ffd6e18 | 1041 | const struct seq_operations cpuinfo_op = { |
1da177e4 LT |
1042 | .start = c_start, |
1043 | .next = c_next, | |
1044 | .stop = c_stop, | |
1045 | .show = c_show | |
1046 | }; |