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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 | */ | |
da58fb65 | 10 | #include <linux/efi.h> |
ecea4ab6 | 11 | #include <linux/export.h> |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/stddef.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/utsname.h> | |
17 | #include <linux/initrd.h> | |
18 | #include <linux/console.h> | |
19 | #include <linux/bootmem.h> | |
20 | #include <linux/seq_file.h> | |
894673ee | 21 | #include <linux/screen_info.h> |
883a106b | 22 | #include <linux/of_platform.h> |
1da177e4 | 23 | #include <linux/init.h> |
3c57fb43 | 24 | #include <linux/kexec.h> |
93c02ab4 | 25 | #include <linux/of_fdt.h> |
1da177e4 LT |
26 | #include <linux/cpu.h> |
27 | #include <linux/interrupt.h> | |
7bbb7940 | 28 | #include <linux/smp.h> |
e119bfff | 29 | #include <linux/proc_fs.h> |
2778f620 | 30 | #include <linux/memblock.h> |
2ecccf90 DM |
31 | #include <linux/bug.h> |
32 | #include <linux/compiler.h> | |
27a3f0e9 | 33 | #include <linux/sort.h> |
be120397 | 34 | #include <linux/psci.h> |
1da177e4 | 35 | |
b86040a5 | 36 | #include <asm/unified.h> |
15d07dc9 | 37 | #include <asm/cp15.h> |
1da177e4 | 38 | #include <asm/cpu.h> |
0ba8b9b2 | 39 | #include <asm/cputype.h> |
da58fb65 | 40 | #include <asm/efi.h> |
1da177e4 | 41 | #include <asm/elf.h> |
2937367b | 42 | #include <asm/early_ioremap.h> |
a5f4c561 | 43 | #include <asm/fixmap.h> |
1da177e4 | 44 | #include <asm/procinfo.h> |
05774088 | 45 | #include <asm/psci.h> |
37efe642 | 46 | #include <asm/sections.h> |
1da177e4 | 47 | #include <asm/setup.h> |
f00ec48f | 48 | #include <asm/smp_plat.h> |
1da177e4 LT |
49 | #include <asm/mach-types.h> |
50 | #include <asm/cacheflush.h> | |
46097c7d | 51 | #include <asm/cachetype.h> |
1da177e4 | 52 | #include <asm/tlbflush.h> |
5882bfef | 53 | #include <asm/xen/hypervisor.h> |
1da177e4 | 54 | |
93c02ab4 | 55 | #include <asm/prom.h> |
1da177e4 LT |
56 | #include <asm/mach/arch.h> |
57 | #include <asm/mach/irq.h> | |
58 | #include <asm/mach/time.h> | |
9f97da78 DH |
59 | #include <asm/system_info.h> |
60 | #include <asm/system_misc.h> | |
5cbad0eb | 61 | #include <asm/traps.h> |
bff595c1 | 62 | #include <asm/unwind.h> |
1c16d242 | 63 | #include <asm/memblock.h> |
4588c34d | 64 | #include <asm/virt.h> |
1da177e4 | 65 | |
4cd9d6f7 | 66 | #include "atags.h" |
0fc1c832 | 67 | |
1da177e4 LT |
68 | |
69 | #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE) | |
70 | char fpe_type[8]; | |
71 | ||
72 | static int __init fpe_setup(char *line) | |
73 | { | |
74 | memcpy(fpe_type, line, 8); | |
75 | return 1; | |
76 | } | |
77 | ||
78 | __setup("fpe=", fpe_setup); | |
79 | #endif | |
80 | ||
ca8f0b0a | 81 | extern void init_default_cache_policy(unsigned long); |
ff69a4c8 | 82 | extern void paging_init(const struct machine_desc *desc); |
b089c31c | 83 | extern void early_mm_init(const struct machine_desc *); |
374d446d | 84 | extern void adjust_lowmem_bounds(void); |
16d6d5b0 | 85 | extern enum reboot_mode reboot_mode; |
ff69a4c8 | 86 | extern void setup_dma_zone(const struct machine_desc *desc); |
1da177e4 LT |
87 | |
88 | unsigned int processor_id; | |
c18f6581 | 89 | EXPORT_SYMBOL(processor_id); |
0385ebc0 | 90 | unsigned int __machine_arch_type __read_mostly; |
1da177e4 | 91 | EXPORT_SYMBOL(__machine_arch_type); |
0385ebc0 | 92 | unsigned int cacheid __read_mostly; |
c0e95878 | 93 | EXPORT_SYMBOL(cacheid); |
1da177e4 | 94 | |
9d20fdd5 BG |
95 | unsigned int __atags_pointer __initdata; |
96 | ||
1da177e4 LT |
97 | unsigned int system_rev; |
98 | EXPORT_SYMBOL(system_rev); | |
99 | ||
3f599875 PK |
100 | const char *system_serial; |
101 | EXPORT_SYMBOL(system_serial); | |
102 | ||
1da177e4 LT |
103 | unsigned int system_serial_low; |
104 | EXPORT_SYMBOL(system_serial_low); | |
105 | ||
106 | unsigned int system_serial_high; | |
107 | EXPORT_SYMBOL(system_serial_high); | |
108 | ||
0385ebc0 | 109 | unsigned int elf_hwcap __read_mostly; |
1da177e4 LT |
110 | EXPORT_SYMBOL(elf_hwcap); |
111 | ||
b342ea4e AB |
112 | unsigned int elf_hwcap2 __read_mostly; |
113 | EXPORT_SYMBOL(elf_hwcap2); | |
114 | ||
1da177e4 LT |
115 | |
116 | #ifdef MULTI_CPU | |
7619751f | 117 | struct processor processor __ro_after_init; |
1da177e4 LT |
118 | #endif |
119 | #ifdef MULTI_TLB | |
7619751f | 120 | struct cpu_tlb_fns cpu_tlb __ro_after_init; |
1da177e4 LT |
121 | #endif |
122 | #ifdef MULTI_USER | |
7619751f | 123 | struct cpu_user_fns cpu_user __ro_after_init; |
1da177e4 LT |
124 | #endif |
125 | #ifdef MULTI_CACHE | |
7619751f | 126 | struct cpu_cache_fns cpu_cache __ro_after_init; |
1da177e4 | 127 | #endif |
953233dc | 128 | #ifdef CONFIG_OUTER_CACHE |
7619751f | 129 | struct outer_cache_fns outer_cache __ro_after_init; |
6c09f09d | 130 | EXPORT_SYMBOL(outer_cache); |
953233dc | 131 | #endif |
1da177e4 | 132 | |
2ecccf90 DM |
133 | /* |
134 | * Cached cpu_architecture() result for use by assembler code. | |
135 | * C code should use the cpu_architecture() function instead of accessing this | |
136 | * variable directly. | |
137 | */ | |
138 | int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN; | |
139 | ||
ccea7a19 RK |
140 | struct stack { |
141 | u32 irq[3]; | |
142 | u32 abt[3]; | |
143 | u32 und[3]; | |
c0e7f7ee | 144 | u32 fiq[3]; |
ccea7a19 RK |
145 | } ____cacheline_aligned; |
146 | ||
55bdd694 | 147 | #ifndef CONFIG_CPU_V7M |
ccea7a19 | 148 | static struct stack stacks[NR_CPUS]; |
55bdd694 | 149 | #endif |
ccea7a19 | 150 | |
1da177e4 LT |
151 | char elf_platform[ELF_PLATFORM_SIZE]; |
152 | EXPORT_SYMBOL(elf_platform); | |
153 | ||
1da177e4 LT |
154 | static const char *cpu_name; |
155 | static const char *machine_name; | |
48ab7e09 | 156 | static char __initdata cmd_line[COMMAND_LINE_SIZE]; |
ff69a4c8 | 157 | const struct machine_desc *machine_desc __initdata; |
1da177e4 | 158 | |
1da177e4 LT |
159 | static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } }; |
160 | #define ENDIANNESS ((char)endian_test.l) | |
161 | ||
162 | DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data); | |
163 | ||
164 | /* | |
165 | * Standard memory resources | |
166 | */ | |
167 | static struct resource mem_res[] = { | |
740e518e GKH |
168 | { |
169 | .name = "Video RAM", | |
170 | .start = 0, | |
171 | .end = 0, | |
172 | .flags = IORESOURCE_MEM | |
173 | }, | |
174 | { | |
a36d8e5b | 175 | .name = "Kernel code", |
740e518e GKH |
176 | .start = 0, |
177 | .end = 0, | |
35d98e93 | 178 | .flags = IORESOURCE_SYSTEM_RAM |
740e518e GKH |
179 | }, |
180 | { | |
181 | .name = "Kernel data", | |
182 | .start = 0, | |
183 | .end = 0, | |
35d98e93 | 184 | .flags = IORESOURCE_SYSTEM_RAM |
740e518e | 185 | } |
1da177e4 LT |
186 | }; |
187 | ||
188 | #define video_ram mem_res[0] | |
189 | #define kernel_code mem_res[1] | |
190 | #define kernel_data mem_res[2] | |
191 | ||
192 | static struct resource io_res[] = { | |
740e518e GKH |
193 | { |
194 | .name = "reserved", | |
195 | .start = 0x3bc, | |
196 | .end = 0x3be, | |
197 | .flags = IORESOURCE_IO | IORESOURCE_BUSY | |
198 | }, | |
199 | { | |
200 | .name = "reserved", | |
201 | .start = 0x378, | |
202 | .end = 0x37f, | |
203 | .flags = IORESOURCE_IO | IORESOURCE_BUSY | |
204 | }, | |
205 | { | |
206 | .name = "reserved", | |
207 | .start = 0x278, | |
208 | .end = 0x27f, | |
209 | .flags = IORESOURCE_IO | IORESOURCE_BUSY | |
210 | } | |
1da177e4 LT |
211 | }; |
212 | ||
213 | #define lp0 io_res[0] | |
214 | #define lp1 io_res[1] | |
215 | #define lp2 io_res[2] | |
216 | ||
1da177e4 LT |
217 | static const char *proc_arch[] = { |
218 | "undefined/unknown", | |
219 | "3", | |
220 | "4", | |
221 | "4T", | |
222 | "5", | |
223 | "5T", | |
224 | "5TE", | |
225 | "5TEJ", | |
226 | "6TEJ", | |
6b090a25 | 227 | "7", |
55bdd694 | 228 | "7M", |
1da177e4 LT |
229 | "?(12)", |
230 | "?(13)", | |
231 | "?(14)", | |
232 | "?(15)", | |
233 | "?(16)", | |
234 | "?(17)", | |
235 | }; | |
236 | ||
55bdd694 CM |
237 | #ifdef CONFIG_CPU_V7M |
238 | static int __get_cpu_architecture(void) | |
239 | { | |
240 | return CPU_ARCH_ARMv7M; | |
241 | } | |
242 | #else | |
2ecccf90 | 243 | static int __get_cpu_architecture(void) |
1da177e4 LT |
244 | { |
245 | int cpu_arch; | |
246 | ||
0ba8b9b2 | 247 | if ((read_cpuid_id() & 0x0008f000) == 0) { |
1da177e4 | 248 | cpu_arch = CPU_ARCH_UNKNOWN; |
0ba8b9b2 RK |
249 | } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) { |
250 | cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3; | |
251 | } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) { | |
252 | cpu_arch = (read_cpuid_id() >> 16) & 7; | |
1da177e4 LT |
253 | if (cpu_arch) |
254 | cpu_arch += CPU_ARCH_ARMv3; | |
0ba8b9b2 | 255 | } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) { |
180005c4 CM |
256 | /* Revised CPUID format. Read the Memory Model Feature |
257 | * Register 0 and check for VMSAv7 or PMSAv7 */ | |
526299ce | 258 | unsigned int mmfr0 = read_cpuid_ext(CPUID_EXT_MMFR0); |
315cfe78 CM |
259 | if ((mmfr0 & 0x0000000f) >= 0x00000003 || |
260 | (mmfr0 & 0x000000f0) >= 0x00000030) | |
180005c4 CM |
261 | cpu_arch = CPU_ARCH_ARMv7; |
262 | else if ((mmfr0 & 0x0000000f) == 0x00000002 || | |
263 | (mmfr0 & 0x000000f0) == 0x00000020) | |
264 | cpu_arch = CPU_ARCH_ARMv6; | |
265 | else | |
266 | cpu_arch = CPU_ARCH_UNKNOWN; | |
267 | } else | |
268 | cpu_arch = CPU_ARCH_UNKNOWN; | |
1da177e4 LT |
269 | |
270 | return cpu_arch; | |
271 | } | |
55bdd694 | 272 | #endif |
1da177e4 | 273 | |
2ecccf90 DM |
274 | int __pure cpu_architecture(void) |
275 | { | |
276 | BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN); | |
277 | ||
278 | return __cpu_architecture; | |
279 | } | |
280 | ||
8925ec4c WD |
281 | static int cpu_has_aliasing_icache(unsigned int arch) |
282 | { | |
283 | int aliasing_icache; | |
284 | unsigned int id_reg, num_sets, line_size; | |
285 | ||
7f94e9cc WD |
286 | /* PIPT caches never alias. */ |
287 | if (icache_is_pipt()) | |
288 | return 0; | |
289 | ||
8925ec4c WD |
290 | /* arch specifies the register format */ |
291 | switch (arch) { | |
292 | case CPU_ARCH_ARMv7: | |
26150aa9 | 293 | set_csselr(CSSELR_ICACHE | CSSELR_L1); |
5fb31a96 | 294 | isb(); |
26150aa9 | 295 | id_reg = read_ccsidr(); |
8925ec4c WD |
296 | line_size = 4 << ((id_reg & 0x7) + 2); |
297 | num_sets = ((id_reg >> 13) & 0x7fff) + 1; | |
298 | aliasing_icache = (line_size * num_sets) > PAGE_SIZE; | |
299 | break; | |
300 | case CPU_ARCH_ARMv6: | |
301 | aliasing_icache = read_cpuid_cachetype() & (1 << 11); | |
302 | break; | |
303 | default: | |
304 | /* I-cache aliases will be handled by D-cache aliasing code */ | |
305 | aliasing_icache = 0; | |
306 | } | |
307 | ||
308 | return aliasing_icache; | |
309 | } | |
310 | ||
c0e95878 RK |
311 | static void __init cacheid_init(void) |
312 | { | |
c0e95878 RK |
313 | unsigned int arch = cpu_architecture(); |
314 | ||
f5a5c89e | 315 | if (arch >= CPU_ARCH_ARMv6) { |
ac52e83f | 316 | unsigned int cachetype = read_cpuid_cachetype(); |
f5a5c89e | 317 | |
d360a687 | 318 | if ((arch == CPU_ARCH_ARMv7M) && !(cachetype & 0xf000f)) { |
f5a5c89e JA |
319 | cacheid = 0; |
320 | } else if ((cachetype & (7 << 29)) == 4 << 29) { | |
b57ee99f | 321 | /* ARMv7 register format */ |
72dc53ac | 322 | arch = CPU_ARCH_ARMv7; |
b57ee99f | 323 | cacheid = CACHEID_VIPT_NONALIASING; |
7f94e9cc WD |
324 | switch (cachetype & (3 << 14)) { |
325 | case (1 << 14): | |
b57ee99f | 326 | cacheid |= CACHEID_ASID_TAGGED; |
7f94e9cc WD |
327 | break; |
328 | case (3 << 14): | |
329 | cacheid |= CACHEID_PIPT; | |
330 | break; | |
331 | } | |
8925ec4c | 332 | } else { |
72dc53ac WD |
333 | arch = CPU_ARCH_ARMv6; |
334 | if (cachetype & (1 << 23)) | |
335 | cacheid = CACHEID_VIPT_ALIASING; | |
336 | else | |
337 | cacheid = CACHEID_VIPT_NONALIASING; | |
8925ec4c | 338 | } |
72dc53ac WD |
339 | if (cpu_has_aliasing_icache(arch)) |
340 | cacheid |= CACHEID_VIPT_I_ALIASING; | |
c0e95878 RK |
341 | } else { |
342 | cacheid = CACHEID_VIVT; | |
343 | } | |
2b4ae1f1 | 344 | |
1b0f6681 | 345 | pr_info("CPU: %s data cache, %s instruction cache\n", |
2b4ae1f1 RK |
346 | cache_is_vivt() ? "VIVT" : |
347 | cache_is_vipt_aliasing() ? "VIPT aliasing" : | |
7f94e9cc | 348 | cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown", |
2b4ae1f1 RK |
349 | cache_is_vivt() ? "VIVT" : |
350 | icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" : | |
8925ec4c | 351 | icache_is_vipt_aliasing() ? "VIPT aliasing" : |
7f94e9cc | 352 | icache_is_pipt() ? "PIPT" : |
2b4ae1f1 | 353 | cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown"); |
c0e95878 RK |
354 | } |
355 | ||
1da177e4 LT |
356 | /* |
357 | * These functions re-use the assembly code in head.S, which | |
358 | * already provide the required functionality. | |
359 | */ | |
0f44ba1d | 360 | extern struct proc_info_list *lookup_processor_type(unsigned int); |
6fc31d54 | 361 | |
93c02ab4 | 362 | void __init early_print(const char *str, ...) |
6fc31d54 RK |
363 | { |
364 | extern void printascii(const char *); | |
365 | char buf[256]; | |
366 | va_list ap; | |
367 | ||
368 | va_start(ap, str); | |
369 | vsnprintf(buf, sizeof(buf), str, ap); | |
370 | va_end(ap); | |
371 | ||
372 | #ifdef CONFIG_DEBUG_LL | |
373 | printascii(buf); | |
374 | #endif | |
375 | printk("%s", buf); | |
376 | } | |
377 | ||
42f25bdd NP |
378 | #ifdef CONFIG_ARM_PATCH_IDIV |
379 | ||
380 | static inline u32 __attribute_const__ sdiv_instruction(void) | |
381 | { | |
382 | if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) { | |
383 | /* "sdiv r0, r0, r1" */ | |
384 | u32 insn = __opcode_thumb32_compose(0xfb90, 0xf0f1); | |
385 | return __opcode_to_mem_thumb32(insn); | |
386 | } | |
387 | ||
388 | /* "sdiv r0, r0, r1" */ | |
389 | return __opcode_to_mem_arm(0xe710f110); | |
390 | } | |
391 | ||
392 | static inline u32 __attribute_const__ udiv_instruction(void) | |
393 | { | |
394 | if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) { | |
395 | /* "udiv r0, r0, r1" */ | |
396 | u32 insn = __opcode_thumb32_compose(0xfbb0, 0xf0f1); | |
397 | return __opcode_to_mem_thumb32(insn); | |
398 | } | |
399 | ||
400 | /* "udiv r0, r0, r1" */ | |
401 | return __opcode_to_mem_arm(0xe730f110); | |
402 | } | |
403 | ||
404 | static inline u32 __attribute_const__ bx_lr_instruction(void) | |
405 | { | |
406 | if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) { | |
407 | /* "bx lr; nop" */ | |
408 | u32 insn = __opcode_thumb32_compose(0x4770, 0x46c0); | |
409 | return __opcode_to_mem_thumb32(insn); | |
410 | } | |
411 | ||
412 | /* "bx lr" */ | |
413 | return __opcode_to_mem_arm(0xe12fff1e); | |
414 | } | |
415 | ||
416 | static void __init patch_aeabi_idiv(void) | |
417 | { | |
418 | extern void __aeabi_uidiv(void); | |
419 | extern void __aeabi_idiv(void); | |
420 | uintptr_t fn_addr; | |
421 | unsigned int mask; | |
422 | ||
423 | mask = IS_ENABLED(CONFIG_THUMB2_KERNEL) ? HWCAP_IDIVT : HWCAP_IDIVA; | |
424 | if (!(elf_hwcap & mask)) | |
425 | return; | |
426 | ||
427 | pr_info("CPU: div instructions available: patching division code\n"); | |
428 | ||
429 | fn_addr = ((uintptr_t)&__aeabi_uidiv) & ~1; | |
208fae5c | 430 | asm ("" : "+g" (fn_addr)); |
42f25bdd NP |
431 | ((u32 *)fn_addr)[0] = udiv_instruction(); |
432 | ((u32 *)fn_addr)[1] = bx_lr_instruction(); | |
433 | flush_icache_range(fn_addr, fn_addr + 8); | |
434 | ||
435 | fn_addr = ((uintptr_t)&__aeabi_idiv) & ~1; | |
208fae5c | 436 | asm ("" : "+g" (fn_addr)); |
42f25bdd NP |
437 | ((u32 *)fn_addr)[0] = sdiv_instruction(); |
438 | ((u32 *)fn_addr)[1] = bx_lr_instruction(); | |
439 | flush_icache_range(fn_addr, fn_addr + 8); | |
440 | } | |
441 | ||
442 | #else | |
443 | static inline void patch_aeabi_idiv(void) { } | |
444 | #endif | |
445 | ||
8164f7af SB |
446 | static void __init cpuid_init_hwcaps(void) |
447 | { | |
b8c9592b | 448 | int block; |
a092aedb | 449 | u32 isar5; |
8164f7af SB |
450 | |
451 | if (cpu_architecture() < CPU_ARCH_ARMv7) | |
452 | return; | |
453 | ||
b8c9592b AB |
454 | block = cpuid_feature_extract(CPUID_EXT_ISAR0, 24); |
455 | if (block >= 2) | |
8164f7af | 456 | elf_hwcap |= HWCAP_IDIVA; |
b8c9592b | 457 | if (block >= 1) |
8164f7af | 458 | elf_hwcap |= HWCAP_IDIVT; |
a469abd0 WD |
459 | |
460 | /* LPAE implies atomic ldrd/strd instructions */ | |
b8c9592b AB |
461 | block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0); |
462 | if (block >= 5) | |
a469abd0 | 463 | elf_hwcap |= HWCAP_LPAE; |
a092aedb AB |
464 | |
465 | /* check for supported v8 Crypto instructions */ | |
466 | isar5 = read_cpuid_ext(CPUID_EXT_ISAR5); | |
467 | ||
468 | block = cpuid_feature_extract_field(isar5, 4); | |
469 | if (block >= 2) | |
470 | elf_hwcap2 |= HWCAP2_PMULL; | |
471 | if (block >= 1) | |
472 | elf_hwcap2 |= HWCAP2_AES; | |
473 | ||
474 | block = cpuid_feature_extract_field(isar5, 8); | |
475 | if (block >= 1) | |
476 | elf_hwcap2 |= HWCAP2_SHA1; | |
477 | ||
478 | block = cpuid_feature_extract_field(isar5, 12); | |
479 | if (block >= 1) | |
480 | elf_hwcap2 |= HWCAP2_SHA2; | |
481 | ||
482 | block = cpuid_feature_extract_field(isar5, 16); | |
483 | if (block >= 1) | |
484 | elf_hwcap2 |= HWCAP2_CRC32; | |
8164f7af SB |
485 | } |
486 | ||
58171bf2 | 487 | static void __init elf_hwcap_fixup(void) |
f159f4ed | 488 | { |
58171bf2 | 489 | unsigned id = read_cpuid_id(); |
f159f4ed TL |
490 | |
491 | /* | |
492 | * HWCAP_TLS is available only on 1136 r1p0 and later, | |
493 | * see also kuser_get_tls_init. | |
494 | */ | |
58171bf2 RK |
495 | if (read_cpuid_part() == ARM_CPU_PART_ARM1136 && |
496 | ((id >> 20) & 3) == 0) { | |
f159f4ed | 497 | elf_hwcap &= ~HWCAP_TLS; |
58171bf2 RK |
498 | return; |
499 | } | |
500 | ||
501 | /* Verify if CPUID scheme is implemented */ | |
502 | if ((id & 0x000f0000) != 0x000f0000) | |
503 | return; | |
504 | ||
505 | /* | |
506 | * If the CPU supports LDREX/STREX and LDREXB/STREXB, | |
507 | * avoid advertising SWP; it may not be atomic with | |
508 | * multiprocessing cores. | |
509 | */ | |
b8c9592b AB |
510 | if (cpuid_feature_extract(CPUID_EXT_ISAR3, 12) > 1 || |
511 | (cpuid_feature_extract(CPUID_EXT_ISAR3, 12) == 1 && | |
03f1217e | 512 | cpuid_feature_extract(CPUID_EXT_ISAR4, 20) >= 3)) |
58171bf2 | 513 | elf_hwcap &= ~HWCAP_SWP; |
f159f4ed TL |
514 | } |
515 | ||
ccea7a19 RK |
516 | /* |
517 | * cpu_init - initialise one CPU. | |
518 | * | |
90f1e084 | 519 | * cpu_init sets up the per-CPU stacks. |
ccea7a19 | 520 | */ |
1783d457 | 521 | void notrace cpu_init(void) |
ccea7a19 | 522 | { |
55bdd694 | 523 | #ifndef CONFIG_CPU_V7M |
ccea7a19 RK |
524 | unsigned int cpu = smp_processor_id(); |
525 | struct stack *stk = &stacks[cpu]; | |
526 | ||
527 | if (cpu >= NR_CPUS) { | |
1b0f6681 | 528 | pr_crit("CPU%u: bad primary CPU number\n", cpu); |
ccea7a19 RK |
529 | BUG(); |
530 | } | |
531 | ||
14318efb RH |
532 | /* |
533 | * This only works on resume and secondary cores. For booting on the | |
534 | * boot cpu, smp_prepare_boot_cpu is called after percpu area setup. | |
535 | */ | |
536 | set_my_cpu_offset(per_cpu_offset(cpu)); | |
537 | ||
b69874e4 RK |
538 | cpu_proc_init(); |
539 | ||
b86040a5 CM |
540 | /* |
541 | * Define the placement constraint for the inline asm directive below. | |
542 | * In Thumb-2, msr with an immediate value is not allowed. | |
543 | */ | |
544 | #ifdef CONFIG_THUMB2_KERNEL | |
545 | #define PLC "r" | |
546 | #else | |
547 | #define PLC "I" | |
548 | #endif | |
549 | ||
ccea7a19 RK |
550 | /* |
551 | * setup stacks for re-entrant exception handlers | |
552 | */ | |
553 | __asm__ ( | |
554 | "msr cpsr_c, %1\n\t" | |
b86040a5 CM |
555 | "add r14, %0, %2\n\t" |
556 | "mov sp, r14\n\t" | |
ccea7a19 | 557 | "msr cpsr_c, %3\n\t" |
b86040a5 CM |
558 | "add r14, %0, %4\n\t" |
559 | "mov sp, r14\n\t" | |
ccea7a19 | 560 | "msr cpsr_c, %5\n\t" |
b86040a5 CM |
561 | "add r14, %0, %6\n\t" |
562 | "mov sp, r14\n\t" | |
c0e7f7ee DT |
563 | "msr cpsr_c, %7\n\t" |
564 | "add r14, %0, %8\n\t" | |
565 | "mov sp, r14\n\t" | |
566 | "msr cpsr_c, %9" | |
ccea7a19 RK |
567 | : |
568 | : "r" (stk), | |
b86040a5 | 569 | PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE), |
ccea7a19 | 570 | "I" (offsetof(struct stack, irq[0])), |
b86040a5 | 571 | PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE), |
ccea7a19 | 572 | "I" (offsetof(struct stack, abt[0])), |
b86040a5 | 573 | PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE), |
ccea7a19 | 574 | "I" (offsetof(struct stack, und[0])), |
c0e7f7ee DT |
575 | PLC (PSR_F_BIT | PSR_I_BIT | FIQ_MODE), |
576 | "I" (offsetof(struct stack, fiq[0])), | |
b86040a5 | 577 | PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE) |
aaaa3f9e | 578 | : "r14"); |
55bdd694 | 579 | #endif |
ccea7a19 RK |
580 | } |
581 | ||
18d7f152 | 582 | u32 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID }; |
eb50439b WD |
583 | |
584 | void __init smp_setup_processor_id(void) | |
585 | { | |
586 | int i; | |
cb8cf4f8 LP |
587 | u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0; |
588 | u32 cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
eb50439b WD |
589 | |
590 | cpu_logical_map(0) = cpu; | |
cb8cf4f8 | 591 | for (i = 1; i < nr_cpu_ids; ++i) |
eb50439b WD |
592 | cpu_logical_map(i) = i == cpu ? 0 : i; |
593 | ||
9394c1c6 ML |
594 | /* |
595 | * clear __my_cpu_offset on boot CPU to avoid hang caused by | |
596 | * using percpu variable early, for example, lockdep will | |
597 | * access percpu variable inside lock_release | |
598 | */ | |
599 | set_my_cpu_offset(0); | |
600 | ||
1b0f6681 | 601 | pr_info("Booting Linux on physical CPU 0x%x\n", mpidr); |
eb50439b WD |
602 | } |
603 | ||
8cf72172 LP |
604 | struct mpidr_hash mpidr_hash; |
605 | #ifdef CONFIG_SMP | |
606 | /** | |
607 | * smp_build_mpidr_hash - Pre-compute shifts required at each affinity | |
608 | * level in order to build a linear index from an | |
609 | * MPIDR value. Resulting algorithm is a collision | |
610 | * free hash carried out through shifting and ORing | |
611 | */ | |
612 | static void __init smp_build_mpidr_hash(void) | |
613 | { | |
614 | u32 i, affinity; | |
615 | u32 fs[3], bits[3], ls, mask = 0; | |
616 | /* | |
617 | * Pre-scan the list of MPIDRS and filter out bits that do | |
618 | * not contribute to affinity levels, ie they never toggle. | |
619 | */ | |
620 | for_each_possible_cpu(i) | |
621 | mask |= (cpu_logical_map(i) ^ cpu_logical_map(0)); | |
622 | pr_debug("mask of set bits 0x%x\n", mask); | |
623 | /* | |
624 | * Find and stash the last and first bit set at all affinity levels to | |
625 | * check how many bits are required to represent them. | |
626 | */ | |
627 | for (i = 0; i < 3; i++) { | |
628 | affinity = MPIDR_AFFINITY_LEVEL(mask, i); | |
629 | /* | |
630 | * Find the MSB bit and LSB bits position | |
631 | * to determine how many bits are required | |
632 | * to express the affinity level. | |
633 | */ | |
634 | ls = fls(affinity); | |
635 | fs[i] = affinity ? ffs(affinity) - 1 : 0; | |
636 | bits[i] = ls - fs[i]; | |
637 | } | |
638 | /* | |
639 | * An index can be created from the MPIDR by isolating the | |
640 | * significant bits at each affinity level and by shifting | |
641 | * them in order to compress the 24 bits values space to a | |
642 | * compressed set of values. This is equivalent to hashing | |
643 | * the MPIDR through shifting and ORing. It is a collision free | |
644 | * hash though not minimal since some levels might contain a number | |
645 | * of CPUs that is not an exact power of 2 and their bit | |
646 | * representation might contain holes, eg MPIDR[7:0] = {0x2, 0x80}. | |
647 | */ | |
648 | mpidr_hash.shift_aff[0] = fs[0]; | |
649 | mpidr_hash.shift_aff[1] = MPIDR_LEVEL_BITS + fs[1] - bits[0]; | |
650 | mpidr_hash.shift_aff[2] = 2*MPIDR_LEVEL_BITS + fs[2] - | |
651 | (bits[1] + bits[0]); | |
652 | mpidr_hash.mask = mask; | |
653 | mpidr_hash.bits = bits[2] + bits[1] + bits[0]; | |
654 | pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] mask[0x%x] bits[%u]\n", | |
655 | mpidr_hash.shift_aff[0], | |
656 | mpidr_hash.shift_aff[1], | |
657 | mpidr_hash.shift_aff[2], | |
658 | mpidr_hash.mask, | |
659 | mpidr_hash.bits); | |
660 | /* | |
661 | * 4x is an arbitrary value used to warn on a hash table much bigger | |
662 | * than expected on most systems. | |
663 | */ | |
664 | if (mpidr_hash_size() > 4 * num_possible_cpus()) | |
665 | pr_warn("Large number of MPIDR hash buckets detected\n"); | |
666 | sync_cache_w(&mpidr_hash); | |
667 | } | |
668 | #endif | |
669 | ||
b69874e4 RK |
670 | static void __init setup_processor(void) |
671 | { | |
672 | struct proc_info_list *list; | |
673 | ||
674 | /* | |
675 | * locate processor in the list of supported processor | |
676 | * types. The linker builds this table for us from the | |
677 | * entries in arch/arm/mm/proc-*.S | |
678 | */ | |
679 | list = lookup_processor_type(read_cpuid_id()); | |
680 | if (!list) { | |
1b0f6681 OJ |
681 | pr_err("CPU configuration botched (ID %08x), unable to continue.\n", |
682 | read_cpuid_id()); | |
b69874e4 RK |
683 | while (1); |
684 | } | |
685 | ||
686 | cpu_name = list->cpu_name; | |
2ecccf90 | 687 | __cpu_architecture = __get_cpu_architecture(); |
b69874e4 RK |
688 | |
689 | #ifdef MULTI_CPU | |
690 | processor = *list->proc; | |
691 | #endif | |
692 | #ifdef MULTI_TLB | |
693 | cpu_tlb = *list->tlb; | |
694 | #endif | |
695 | #ifdef MULTI_USER | |
696 | cpu_user = *list->user; | |
697 | #endif | |
698 | #ifdef MULTI_CACHE | |
699 | cpu_cache = *list->cache; | |
700 | #endif | |
701 | ||
1b0f6681 OJ |
702 | pr_info("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n", |
703 | cpu_name, read_cpuid_id(), read_cpuid_id() & 15, | |
4585eaff | 704 | proc_arch[cpu_architecture()], get_cr()); |
b69874e4 | 705 | |
a34dbfb0 WD |
706 | snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c", |
707 | list->arch_name, ENDIANNESS); | |
708 | snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c", | |
709 | list->elf_name, ENDIANNESS); | |
b69874e4 | 710 | elf_hwcap = list->elf_hwcap; |
8164f7af SB |
711 | |
712 | cpuid_init_hwcaps(); | |
42f25bdd | 713 | patch_aeabi_idiv(); |
8164f7af | 714 | |
b69874e4 | 715 | #ifndef CONFIG_ARM_THUMB |
c40e3641 | 716 | elf_hwcap &= ~(HWCAP_THUMB | HWCAP_IDIVT); |
b69874e4 | 717 | #endif |
ca8f0b0a RK |
718 | #ifdef CONFIG_MMU |
719 | init_default_cache_policy(list->__cpu_mm_mmu_flags); | |
720 | #endif | |
92871b94 RH |
721 | erratum_a15_798181_init(); |
722 | ||
58171bf2 | 723 | elf_hwcap_fixup(); |
b69874e4 RK |
724 | |
725 | cacheid_init(); | |
726 | cpu_init(); | |
727 | } | |
728 | ||
93c02ab4 | 729 | void __init dump_machine_table(void) |
1da177e4 | 730 | { |
ff69a4c8 | 731 | const struct machine_desc *p; |
1da177e4 | 732 | |
6291319d GL |
733 | early_print("Available machine support:\n\nID (hex)\tNAME\n"); |
734 | for_each_machine_desc(p) | |
dce72dd0 | 735 | early_print("%08x\t%s\n", p->nr, p->name); |
1da177e4 | 736 | |
dce72dd0 | 737 | early_print("\nPlease check your kernel config and/or bootloader.\n"); |
1da177e4 | 738 | |
dce72dd0 NP |
739 | while (true) |
740 | /* can't use cpu_relax() here as it may require MMU setup */; | |
1da177e4 LT |
741 | } |
742 | ||
6a5014aa | 743 | int __init arm_add_memory(u64 start, u64 size) |
3a669411 | 744 | { |
6d7d5da7 | 745 | u64 aligned_start; |
4b5f32ce | 746 | |
3a669411 RK |
747 | /* |
748 | * Ensure that start/size are aligned to a page boundary. | |
909ba297 | 749 | * Size is rounded down, start is rounded up. |
3a669411 | 750 | */ |
6d7d5da7 | 751 | aligned_start = PAGE_ALIGN(start); |
909ba297 MY |
752 | if (aligned_start > start + size) |
753 | size = 0; | |
754 | else | |
755 | size -= aligned_start - start; | |
e5ab8580 | 756 | |
6d7d5da7 MD |
757 | #ifndef CONFIG_ARCH_PHYS_ADDR_T_64BIT |
758 | if (aligned_start > ULONG_MAX) { | |
1b0f6681 OJ |
759 | pr_crit("Ignoring memory at 0x%08llx outside 32-bit physical address space\n", |
760 | (long long)start); | |
6d7d5da7 MD |
761 | return -EINVAL; |
762 | } | |
763 | ||
764 | if (aligned_start + size > ULONG_MAX) { | |
1b0f6681 OJ |
765 | pr_crit("Truncating memory at 0x%08llx to fit in 32-bit physical address space\n", |
766 | (long long)start); | |
e5ab8580 WD |
767 | /* |
768 | * To ensure bank->start + bank->size is representable in | |
769 | * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB. | |
770 | * This means we lose a page after masking. | |
771 | */ | |
6d7d5da7 | 772 | size = ULONG_MAX - aligned_start; |
e5ab8580 WD |
773 | } |
774 | #endif | |
775 | ||
571b1437 RK |
776 | if (aligned_start < PHYS_OFFSET) { |
777 | if (aligned_start + size <= PHYS_OFFSET) { | |
778 | pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n", | |
779 | aligned_start, aligned_start + size); | |
780 | return -EINVAL; | |
781 | } | |
782 | ||
783 | pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n", | |
784 | aligned_start, (u64)PHYS_OFFSET); | |
785 | ||
786 | size -= PHYS_OFFSET - aligned_start; | |
787 | aligned_start = PHYS_OFFSET; | |
788 | } | |
789 | ||
1c2f87c2 LA |
790 | start = aligned_start; |
791 | size = size & ~(phys_addr_t)(PAGE_SIZE - 1); | |
4b5f32ce NP |
792 | |
793 | /* | |
794 | * Check whether this memory region has non-zero size or | |
795 | * invalid node number. | |
796 | */ | |
1c2f87c2 | 797 | if (size == 0) |
4b5f32ce NP |
798 | return -EINVAL; |
799 | ||
1c2f87c2 | 800 | memblock_add(start, size); |
4b5f32ce | 801 | return 0; |
3a669411 RK |
802 | } |
803 | ||
1da177e4 LT |
804 | /* |
805 | * Pick out the memory size. We look for mem=size@start, | |
806 | * where start and size are "size[KkMm]" | |
807 | */ | |
1c2f87c2 | 808 | |
2b0d8c25 | 809 | static int __init early_mem(char *p) |
1da177e4 LT |
810 | { |
811 | static int usermem __initdata = 0; | |
6a5014aa MD |
812 | u64 size; |
813 | u64 start; | |
2b0d8c25 | 814 | char *endp; |
1da177e4 LT |
815 | |
816 | /* | |
817 | * If the user specifies memory size, we | |
818 | * blow away any automatically generated | |
819 | * size. | |
820 | */ | |
821 | if (usermem == 0) { | |
822 | usermem = 1; | |
1c2f87c2 LA |
823 | memblock_remove(memblock_start_of_DRAM(), |
824 | memblock_end_of_DRAM() - memblock_start_of_DRAM()); | |
1da177e4 LT |
825 | } |
826 | ||
827 | start = PHYS_OFFSET; | |
2b0d8c25 JK |
828 | size = memparse(p, &endp); |
829 | if (*endp == '@') | |
830 | start = memparse(endp + 1, NULL); | |
1da177e4 | 831 | |
1c97b73e | 832 | arm_add_memory(start, size); |
1da177e4 | 833 | |
2b0d8c25 | 834 | return 0; |
1da177e4 | 835 | } |
2b0d8c25 | 836 | early_param("mem", early_mem); |
1da177e4 | 837 | |
ff69a4c8 | 838 | static void __init request_standard_resources(const struct machine_desc *mdesc) |
1da177e4 | 839 | { |
11b9369c | 840 | struct memblock_region *region; |
1da177e4 | 841 | struct resource *res; |
1da177e4 | 842 | |
37efe642 | 843 | kernel_code.start = virt_to_phys(_text); |
14c4a533 | 844 | kernel_code.end = virt_to_phys(__init_begin - 1); |
842eab40 | 845 | kernel_data.start = virt_to_phys(_sdata); |
37efe642 | 846 | kernel_data.end = virt_to_phys(_end - 1); |
1da177e4 | 847 | |
11b9369c | 848 | for_each_memblock(memory, region) { |
966fab00 RK |
849 | phys_addr_t start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); |
850 | phys_addr_t end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; | |
851 | unsigned long boot_alias_start; | |
852 | ||
853 | /* | |
854 | * Some systems have a special memory alias which is only | |
855 | * used for booting. We need to advertise this region to | |
856 | * kexec-tools so they know where bootable RAM is located. | |
857 | */ | |
858 | boot_alias_start = phys_to_idmap(start); | |
859 | if (arm_has_idmap_alias() && boot_alias_start != IDMAP_INVALID_ADDR) { | |
860 | res = memblock_virt_alloc(sizeof(*res), 0); | |
861 | res->name = "System RAM (boot alias)"; | |
862 | res->start = boot_alias_start; | |
863 | res->end = phys_to_idmap(end); | |
864 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
865 | request_resource(&iomem_resource, res); | |
866 | } | |
867 | ||
ca474408 | 868 | res = memblock_virt_alloc(sizeof(*res), 0); |
1da177e4 | 869 | res->name = "System RAM"; |
966fab00 RK |
870 | res->start = start; |
871 | res->end = end; | |
35d98e93 | 872 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
1da177e4 LT |
873 | |
874 | request_resource(&iomem_resource, res); | |
875 | ||
876 | if (kernel_code.start >= res->start && | |
877 | kernel_code.end <= res->end) | |
878 | request_resource(res, &kernel_code); | |
879 | if (kernel_data.start >= res->start && | |
880 | kernel_data.end <= res->end) | |
881 | request_resource(res, &kernel_data); | |
882 | } | |
883 | ||
884 | if (mdesc->video_start) { | |
885 | video_ram.start = mdesc->video_start; | |
886 | video_ram.end = mdesc->video_end; | |
887 | request_resource(&iomem_resource, &video_ram); | |
888 | } | |
889 | ||
890 | /* | |
891 | * Some machines don't have the possibility of ever | |
892 | * possessing lp0, lp1 or lp2 | |
893 | */ | |
894 | if (mdesc->reserve_lp0) | |
895 | request_resource(&ioport_resource, &lp0); | |
896 | if (mdesc->reserve_lp1) | |
897 | request_resource(&ioport_resource, &lp1); | |
898 | if (mdesc->reserve_lp2) | |
899 | request_resource(&ioport_resource, &lp2); | |
900 | } | |
901 | ||
801820be AB |
902 | #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) || \ |
903 | defined(CONFIG_EFI) | |
1da177e4 LT |
904 | struct screen_info screen_info = { |
905 | .orig_video_lines = 30, | |
906 | .orig_video_cols = 80, | |
907 | .orig_video_mode = 0, | |
908 | .orig_video_ega_bx = 0, | |
909 | .orig_video_isVGA = 1, | |
910 | .orig_video_points = 8 | |
911 | }; | |
4394c124 | 912 | #endif |
1da177e4 | 913 | |
1da177e4 LT |
914 | static int __init customize_machine(void) |
915 | { | |
883a106b AB |
916 | /* |
917 | * customizes platform devices, or adds new ones | |
918 | * On DT based machines, we fall back to populating the | |
919 | * machine from the device tree, if no callback is provided, | |
920 | * otherwise we would always need an init_machine callback. | |
921 | */ | |
8ff1443c RK |
922 | if (machine_desc->init_machine) |
923 | machine_desc->init_machine(); | |
850bea23 | 924 | |
1da177e4 LT |
925 | return 0; |
926 | } | |
927 | arch_initcall(customize_machine); | |
928 | ||
90de4137 SG |
929 | static int __init init_machine_late(void) |
930 | { | |
3f599875 PK |
931 | struct device_node *root; |
932 | int ret; | |
933 | ||
90de4137 SG |
934 | if (machine_desc->init_late) |
935 | machine_desc->init_late(); | |
3f599875 PK |
936 | |
937 | root = of_find_node_by_path("/"); | |
938 | if (root) { | |
939 | ret = of_property_read_string(root, "serial-number", | |
940 | &system_serial); | |
941 | if (ret) | |
942 | system_serial = NULL; | |
943 | } | |
944 | ||
945 | if (!system_serial) | |
946 | system_serial = kasprintf(GFP_KERNEL, "%08x%08x", | |
947 | system_serial_high, | |
948 | system_serial_low); | |
949 | ||
90de4137 SG |
950 | return 0; |
951 | } | |
952 | late_initcall(init_machine_late); | |
953 | ||
3c57fb43 | 954 | #ifdef CONFIG_KEXEC |
61603016 RK |
955 | /* |
956 | * The crash region must be aligned to 128MB to avoid | |
957 | * zImage relocating below the reserved region. | |
958 | */ | |
959 | #define CRASH_ALIGN (128 << 20) | |
61603016 | 960 | |
3c57fb43 MW |
961 | static inline unsigned long long get_total_mem(void) |
962 | { | |
963 | unsigned long total; | |
964 | ||
965 | total = max_low_pfn - min_low_pfn; | |
966 | return total << PAGE_SHIFT; | |
967 | } | |
968 | ||
969 | /** | |
970 | * reserve_crashkernel() - reserves memory are for crash kernel | |
971 | * | |
972 | * This function reserves memory area given in "crashkernel=" kernel command | |
973 | * line parameter. The memory reserved is used by a dump capture kernel when | |
974 | * primary kernel is crashing. | |
975 | */ | |
976 | static void __init reserve_crashkernel(void) | |
977 | { | |
978 | unsigned long long crash_size, crash_base; | |
979 | unsigned long long total_mem; | |
980 | int ret; | |
981 | ||
982 | total_mem = get_total_mem(); | |
983 | ret = parse_crashkernel(boot_command_line, total_mem, | |
984 | &crash_size, &crash_base); | |
985 | if (ret) | |
986 | return; | |
987 | ||
61603016 | 988 | if (crash_base <= 0) { |
d0506a23 | 989 | unsigned long long crash_max = idmap_to_phys((u32)~0); |
61603016 RK |
990 | crash_base = memblock_find_in_range(CRASH_ALIGN, crash_max, |
991 | crash_size, CRASH_ALIGN); | |
992 | if (!crash_base) { | |
993 | pr_err("crashkernel reservation failed - No suitable area found.\n"); | |
994 | return; | |
995 | } | |
996 | } else { | |
997 | unsigned long long start; | |
998 | ||
999 | start = memblock_find_in_range(crash_base, | |
1000 | crash_base + crash_size, | |
1001 | crash_size, SECTION_SIZE); | |
1002 | if (start != crash_base) { | |
1003 | pr_err("crashkernel reservation failed - memory is in use.\n"); | |
1004 | return; | |
1005 | } | |
1006 | } | |
1007 | ||
84f452b1 | 1008 | ret = memblock_reserve(crash_base, crash_size); |
3c57fb43 | 1009 | if (ret < 0) { |
1b0f6681 OJ |
1010 | pr_warn("crashkernel reservation failed - memory is in use (0x%lx)\n", |
1011 | (unsigned long)crash_base); | |
3c57fb43 MW |
1012 | return; |
1013 | } | |
1014 | ||
1b0f6681 OJ |
1015 | pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n", |
1016 | (unsigned long)(crash_size >> 20), | |
1017 | (unsigned long)(crash_base >> 20), | |
1018 | (unsigned long)(total_mem >> 20)); | |
3c57fb43 | 1019 | |
f7f0b7dc | 1020 | /* The crashk resource must always be located in normal mem */ |
3c57fb43 MW |
1021 | crashk_res.start = crash_base; |
1022 | crashk_res.end = crash_base + crash_size - 1; | |
1023 | insert_resource(&iomem_resource, &crashk_res); | |
f7f0b7dc RK |
1024 | |
1025 | if (arm_has_idmap_alias()) { | |
1026 | /* | |
1027 | * If we have a special RAM alias for use at boot, we | |
1028 | * need to advertise to kexec tools where the alias is. | |
1029 | */ | |
1030 | static struct resource crashk_boot_res = { | |
1031 | .name = "Crash kernel (boot alias)", | |
1032 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
1033 | }; | |
1034 | ||
1035 | crashk_boot_res.start = phys_to_idmap(crash_base); | |
1036 | crashk_boot_res.end = crashk_boot_res.start + crash_size - 1; | |
1037 | insert_resource(&iomem_resource, &crashk_boot_res); | |
1038 | } | |
3c57fb43 MW |
1039 | } |
1040 | #else | |
1041 | static inline void reserve_crashkernel(void) {} | |
1042 | #endif /* CONFIG_KEXEC */ | |
1043 | ||
4588c34d DM |
1044 | void __init hyp_mode_check(void) |
1045 | { | |
1046 | #ifdef CONFIG_ARM_VIRT_EXT | |
8fbac214 MR |
1047 | sync_boot_mode(); |
1048 | ||
4588c34d DM |
1049 | if (is_hyp_mode_available()) { |
1050 | pr_info("CPU: All CPU(s) started in HYP mode.\n"); | |
1051 | pr_info("CPU: Virtualization extensions available.\n"); | |
1052 | } else if (is_hyp_mode_mismatched()) { | |
1053 | pr_warn("CPU: WARNING: CPU(s) started in wrong/inconsistent modes (primary CPU mode 0x%x)\n", | |
1054 | __boot_cpu_mode & MODE_MASK); | |
1055 | pr_warn("CPU: This may indicate a broken bootloader or firmware.\n"); | |
1056 | } else | |
1057 | pr_info("CPU: All CPU(s) started in SVC mode.\n"); | |
1058 | #endif | |
1059 | } | |
1060 | ||
6291319d GL |
1061 | void __init setup_arch(char **cmdline_p) |
1062 | { | |
ff69a4c8 | 1063 | const struct machine_desc *mdesc; |
6291319d | 1064 | |
6291319d | 1065 | setup_processor(); |
93c02ab4 GL |
1066 | mdesc = setup_machine_fdt(__atags_pointer); |
1067 | if (!mdesc) | |
b8b499c8 | 1068 | mdesc = setup_machine_tags(__atags_pointer, __machine_arch_type); |
6291319d GL |
1069 | machine_desc = mdesc; |
1070 | machine_name = mdesc->name; | |
719c9d14 | 1071 | dump_stack_set_arch_desc("%s", mdesc->name); |
6291319d | 1072 | |
16d6d5b0 RH |
1073 | if (mdesc->reboot_mode != REBOOT_HARD) |
1074 | reboot_mode = mdesc->reboot_mode; | |
6291319d | 1075 | |
37efe642 RK |
1076 | init_mm.start_code = (unsigned long) _text; |
1077 | init_mm.end_code = (unsigned long) _etext; | |
1078 | init_mm.end_data = (unsigned long) _edata; | |
1079 | init_mm.brk = (unsigned long) _end; | |
1da177e4 | 1080 | |
48ab7e09 JK |
1081 | /* populate cmd_line too for later use, preserving boot_command_line */ |
1082 | strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); | |
1083 | *cmdline_p = cmd_line; | |
2b0d8c25 | 1084 | |
2937367b AB |
1085 | early_fixmap_init(); |
1086 | early_ioremap_init(); | |
a5f4c561 | 1087 | |
2b0d8c25 JK |
1088 | parse_early_param(); |
1089 | ||
1221ed10 | 1090 | #ifdef CONFIG_MMU |
b089c31c | 1091 | early_mm_init(mdesc); |
1221ed10 | 1092 | #endif |
7c927322 | 1093 | setup_dma_zone(mdesc); |
9b08aaa3 | 1094 | xen_early_init(); |
da58fb65 | 1095 | efi_init(); |
98562656 LA |
1096 | /* |
1097 | * Make sure the calculation for lowmem/highmem is set appropriately | |
1098 | * before reserving/allocating any mmeory | |
1099 | */ | |
374d446d | 1100 | adjust_lowmem_bounds(); |
1c2f87c2 | 1101 | arm_memblock_init(mdesc); |
98562656 LA |
1102 | /* Memory may have been removed so recalculate the bounds. */ |
1103 | adjust_lowmem_bounds(); | |
2778f620 | 1104 | |
2937367b AB |
1105 | early_ioremap_reset(); |
1106 | ||
4b5f32ce | 1107 | paging_init(mdesc); |
11b9369c | 1108 | request_standard_resources(mdesc); |
1da177e4 | 1109 | |
a528721d RK |
1110 | if (mdesc->restart) |
1111 | arm_pm_restart = mdesc->restart; | |
1112 | ||
93c02ab4 GL |
1113 | unflatten_device_tree(); |
1114 | ||
5587164e | 1115 | arm_dt_init_cpu_maps(); |
be120397 | 1116 | psci_dt_init(); |
7bbb7940 | 1117 | #ifdef CONFIG_SMP |
abcee5fb | 1118 | if (is_smp()) { |
b382b940 JM |
1119 | if (!mdesc->smp_init || !mdesc->smp_init()) { |
1120 | if (psci_smp_available()) | |
1121 | smp_set_ops(&psci_smp_ops); | |
1122 | else if (mdesc->smp) | |
1123 | smp_set_ops(mdesc->smp); | |
1124 | } | |
f00ec48f | 1125 | smp_init_cpus(); |
8cf72172 | 1126 | smp_build_mpidr_hash(); |
abcee5fb | 1127 | } |
7bbb7940 | 1128 | #endif |
4588c34d DM |
1129 | |
1130 | if (!is_smp()) | |
1131 | hyp_mode_check(); | |
1132 | ||
3c57fb43 | 1133 | reserve_crashkernel(); |
7bbb7940 | 1134 | |
52108641 | 1135 | #ifdef CONFIG_MULTI_IRQ_HANDLER |
1136 | handle_arch_irq = mdesc->handle_irq; | |
1137 | #endif | |
1da177e4 LT |
1138 | |
1139 | #ifdef CONFIG_VT | |
1140 | #if defined(CONFIG_VGA_CONSOLE) | |
1141 | conswitchp = &vga_con; | |
1142 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
1143 | conswitchp = &dummy_con; | |
1144 | #endif | |
1145 | #endif | |
dec12e62 RK |
1146 | |
1147 | if (mdesc->init_early) | |
1148 | mdesc->init_early(); | |
1da177e4 LT |
1149 | } |
1150 | ||
1151 | ||
1152 | static int __init topology_init(void) | |
1153 | { | |
1154 | int cpu; | |
1155 | ||
66fb8bd2 RK |
1156 | for_each_possible_cpu(cpu) { |
1157 | struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu); | |
787047ee | 1158 | cpuinfo->cpu.hotpluggable = platform_can_hotplug_cpu(cpu); |
66fb8bd2 RK |
1159 | register_cpu(&cpuinfo->cpu, cpu); |
1160 | } | |
1da177e4 LT |
1161 | |
1162 | return 0; | |
1163 | } | |
1da177e4 LT |
1164 | subsys_initcall(topology_init); |
1165 | ||
e119bfff RK |
1166 | #ifdef CONFIG_HAVE_PROC_CPU |
1167 | static int __init proc_cpu_init(void) | |
1168 | { | |
1169 | struct proc_dir_entry *res; | |
1170 | ||
1171 | res = proc_mkdir("cpu", NULL); | |
1172 | if (!res) | |
1173 | return -ENOMEM; | |
1174 | return 0; | |
1175 | } | |
1176 | fs_initcall(proc_cpu_init); | |
1177 | #endif | |
1178 | ||
1da177e4 LT |
1179 | static const char *hwcap_str[] = { |
1180 | "swp", | |
1181 | "half", | |
1182 | "thumb", | |
1183 | "26bit", | |
1184 | "fastmult", | |
1185 | "fpa", | |
1186 | "vfp", | |
1187 | "edsp", | |
1188 | "java", | |
8f7f9435 | 1189 | "iwmmxt", |
99e4a6dd | 1190 | "crunch", |
4369ae16 | 1191 | "thumbee", |
2bedbdf4 | 1192 | "neon", |
7279dc3e CM |
1193 | "vfpv3", |
1194 | "vfpv3d16", | |
254cdf8e WD |
1195 | "tls", |
1196 | "vfpv4", | |
1197 | "idiva", | |
1198 | "idivt", | |
ab8d46c0 | 1199 | "vfpd32", |
a469abd0 | 1200 | "lpae", |
e9faebc6 | 1201 | "evtstrm", |
1da177e4 LT |
1202 | NULL |
1203 | }; | |
1204 | ||
b342ea4e | 1205 | static const char *hwcap2_str[] = { |
8258a989 AB |
1206 | "aes", |
1207 | "pmull", | |
1208 | "sha1", | |
1209 | "sha2", | |
1210 | "crc32", | |
b342ea4e AB |
1211 | NULL |
1212 | }; | |
1213 | ||
1da177e4 LT |
1214 | static int c_show(struct seq_file *m, void *v) |
1215 | { | |
b4b8f770 LP |
1216 | int i, j; |
1217 | u32 cpuid; | |
1da177e4 | 1218 | |
1da177e4 | 1219 | for_each_online_cpu(i) { |
15559722 RK |
1220 | /* |
1221 | * glibc reads /proc/cpuinfo to determine the number of | |
1222 | * online processors, looking for lines beginning with | |
1223 | * "processor". Give glibc what it expects. | |
1224 | */ | |
1225 | seq_printf(m, "processor\t: %d\n", i); | |
b4b8f770 LP |
1226 | cpuid = is_smp() ? per_cpu(cpu_data, i).cpuid : read_cpuid_id(); |
1227 | seq_printf(m, "model name\t: %s rev %d (%s)\n", | |
1228 | cpu_name, cpuid & 15, elf_platform); | |
1229 | ||
4bf9636c PM |
1230 | #if defined(CONFIG_SMP) |
1231 | seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", | |
1232 | per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ), | |
1233 | (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100); | |
1234 | #else | |
1235 | seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", | |
1236 | loops_per_jiffy / (500000/HZ), | |
1237 | (loops_per_jiffy / (5000/HZ)) % 100); | |
1238 | #endif | |
b4b8f770 LP |
1239 | /* dump out the processor features */ |
1240 | seq_puts(m, "Features\t: "); | |
1da177e4 | 1241 | |
b4b8f770 LP |
1242 | for (j = 0; hwcap_str[j]; j++) |
1243 | if (elf_hwcap & (1 << j)) | |
1244 | seq_printf(m, "%s ", hwcap_str[j]); | |
1da177e4 | 1245 | |
b342ea4e AB |
1246 | for (j = 0; hwcap2_str[j]; j++) |
1247 | if (elf_hwcap2 & (1 << j)) | |
1248 | seq_printf(m, "%s ", hwcap2_str[j]); | |
1249 | ||
b4b8f770 LP |
1250 | seq_printf(m, "\nCPU implementer\t: 0x%02x\n", cpuid >> 24); |
1251 | seq_printf(m, "CPU architecture: %s\n", | |
1252 | proc_arch[cpu_architecture()]); | |
1da177e4 | 1253 | |
b4b8f770 LP |
1254 | if ((cpuid & 0x0008f000) == 0x00000000) { |
1255 | /* pre-ARM7 */ | |
1256 | seq_printf(m, "CPU part\t: %07x\n", cpuid >> 4); | |
1da177e4 | 1257 | } else { |
b4b8f770 LP |
1258 | if ((cpuid & 0x0008f000) == 0x00007000) { |
1259 | /* ARM7 */ | |
1260 | seq_printf(m, "CPU variant\t: 0x%02x\n", | |
1261 | (cpuid >> 16) & 127); | |
1262 | } else { | |
1263 | /* post-ARM7 */ | |
1264 | seq_printf(m, "CPU variant\t: 0x%x\n", | |
1265 | (cpuid >> 20) & 15); | |
1266 | } | |
1267 | seq_printf(m, "CPU part\t: 0x%03x\n", | |
1268 | (cpuid >> 4) & 0xfff); | |
1da177e4 | 1269 | } |
b4b8f770 | 1270 | seq_printf(m, "CPU revision\t: %d\n\n", cpuid & 15); |
1da177e4 | 1271 | } |
1da177e4 LT |
1272 | |
1273 | seq_printf(m, "Hardware\t: %s\n", machine_name); | |
1274 | seq_printf(m, "Revision\t: %04x\n", system_rev); | |
3f599875 | 1275 | seq_printf(m, "Serial\t\t: %s\n", system_serial); |
1da177e4 LT |
1276 | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | static void *c_start(struct seq_file *m, loff_t *pos) | |
1281 | { | |
1282 | return *pos < 1 ? (void *)1 : NULL; | |
1283 | } | |
1284 | ||
1285 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
1286 | { | |
1287 | ++*pos; | |
1288 | return NULL; | |
1289 | } | |
1290 | ||
1291 | static void c_stop(struct seq_file *m, void *v) | |
1292 | { | |
1293 | } | |
1294 | ||
2ffd6e18 | 1295 | const struct seq_operations cpuinfo_op = { |
1da177e4 LT |
1296 | .start = c_start, |
1297 | .next = c_next, | |
1298 | .stop = c_stop, | |
1299 | .show = c_show | |
1300 | }; |