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9703d9d7 CM |
1 | /* |
2 | * Based on arch/arm/kernel/setup.c | |
3 | * | |
4 | * Copyright (C) 1995-2001 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
37655163 | 20 | #include <linux/acpi.h> |
9703d9d7 CM |
21 | #include <linux/export.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/ioport.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/utsname.h> | |
27 | #include <linux/initrd.h> | |
28 | #include <linux/console.h> | |
a41dc0e8 | 29 | #include <linux/cache.h> |
9703d9d7 CM |
30 | #include <linux/bootmem.h> |
31 | #include <linux/seq_file.h> | |
32 | #include <linux/screen_info.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/kexec.h> | |
35 | #include <linux/crash_dump.h> | |
36 | #include <linux/root_dev.h> | |
de79a64d | 37 | #include <linux/clk-provider.h> |
9703d9d7 CM |
38 | #include <linux/cpu.h> |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/smp.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/proc_fs.h> | |
43 | #include <linux/memblock.h> | |
78d51e0b | 44 | #include <linux/of_iommu.h> |
9703d9d7 | 45 | #include <linux/of_fdt.h> |
d6bafb9b | 46 | #include <linux/of_platform.h> |
f84d0275 | 47 | #include <linux/efi.h> |
44b82b77 | 48 | #include <linux/personality.h> |
9703d9d7 | 49 | |
37655163 | 50 | #include <asm/acpi.h> |
bf4b558e | 51 | #include <asm/fixmap.h> |
df857416 | 52 | #include <asm/cpu.h> |
9703d9d7 CM |
53 | #include <asm/cputype.h> |
54 | #include <asm/elf.h> | |
930da09f | 55 | #include <asm/cpufeature.h> |
e8765b26 | 56 | #include <asm/cpu_ops.h> |
9703d9d7 CM |
57 | #include <asm/sections.h> |
58 | #include <asm/setup.h> | |
4c7aa002 | 59 | #include <asm/smp_plat.h> |
9703d9d7 CM |
60 | #include <asm/cacheflush.h> |
61 | #include <asm/tlbflush.h> | |
62 | #include <asm/traps.h> | |
63 | #include <asm/memblock.h> | |
e790f1de | 64 | #include <asm/psci.h> |
f84d0275 | 65 | #include <asm/efi.h> |
667f3fd3 | 66 | #include <asm/virt.h> |
9703d9d7 | 67 | |
25804e6a | 68 | unsigned long elf_hwcap __read_mostly; |
9703d9d7 CM |
69 | EXPORT_SYMBOL_GPL(elf_hwcap); |
70 | ||
46efe547 SH |
71 | #ifdef CONFIG_COMPAT |
72 | #define COMPAT_ELF_HWCAP_DEFAULT \ | |
73 | (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\ | |
74 | COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\ | |
75 | COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\ | |
76 | COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\ | |
7d57511d CM |
77 | COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV|\ |
78 | COMPAT_HWCAP_LPAE) | |
46efe547 | 79 | unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; |
28964d32 | 80 | unsigned int compat_elf_hwcap2 __read_mostly; |
46efe547 SH |
81 | #endif |
82 | ||
06f9eb88 | 83 | DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); |
930da09f | 84 | |
9703d9d7 CM |
85 | phys_addr_t __fdt_pointer __initdata; |
86 | ||
87 | /* | |
88 | * Standard memory resources | |
89 | */ | |
90 | static struct resource mem_res[] = { | |
91 | { | |
92 | .name = "Kernel code", | |
93 | .start = 0, | |
94 | .end = 0, | |
95 | .flags = IORESOURCE_MEM | |
96 | }, | |
97 | { | |
98 | .name = "Kernel data", | |
99 | .start = 0, | |
100 | .end = 0, | |
101 | .flags = IORESOURCE_MEM | |
102 | } | |
103 | }; | |
104 | ||
105 | #define kernel_code mem_res[0] | |
106 | #define kernel_data mem_res[1] | |
107 | ||
108 | void __init early_print(const char *str, ...) | |
109 | { | |
110 | char buf[256]; | |
111 | va_list ap; | |
112 | ||
113 | va_start(ap, str); | |
114 | vsnprintf(buf, sizeof(buf), str, ap); | |
115 | va_end(ap); | |
116 | ||
117 | printk("%s", buf); | |
118 | } | |
119 | ||
da9c177d AB |
120 | /* |
121 | * The recorded values of x0 .. x3 upon kernel entry. | |
122 | */ | |
123 | u64 __cacheline_aligned boot_args[4]; | |
124 | ||
71586276 WD |
125 | void __init smp_setup_processor_id(void) |
126 | { | |
80708677 MR |
127 | u64 mpidr = read_cpuid_mpidr() & MPIDR_HWID_BITMASK; |
128 | cpu_logical_map(0) = mpidr; | |
129 | ||
71586276 WD |
130 | /* |
131 | * clear __my_cpu_offset on boot CPU to avoid hang caused by | |
132 | * using percpu variable early, for example, lockdep will | |
133 | * access percpu variable inside lock_release | |
134 | */ | |
135 | set_my_cpu_offset(0); | |
80708677 | 136 | pr_info("Booting Linux on physical CPU 0x%lx\n", (unsigned long)mpidr); |
71586276 WD |
137 | } |
138 | ||
6e15d0e0 SH |
139 | bool arch_match_cpu_phys_id(int cpu, u64 phys_id) |
140 | { | |
141 | return phys_id == cpu_logical_map(cpu); | |
142 | } | |
143 | ||
976d7d3f LP |
144 | struct mpidr_hash mpidr_hash; |
145 | #ifdef CONFIG_SMP | |
146 | /** | |
147 | * smp_build_mpidr_hash - Pre-compute shifts required at each affinity | |
148 | * level in order to build a linear index from an | |
149 | * MPIDR value. Resulting algorithm is a collision | |
150 | * free hash carried out through shifting and ORing | |
151 | */ | |
152 | static void __init smp_build_mpidr_hash(void) | |
153 | { | |
154 | u32 i, affinity, fs[4], bits[4], ls; | |
155 | u64 mask = 0; | |
156 | /* | |
157 | * Pre-scan the list of MPIDRS and filter out bits that do | |
158 | * not contribute to affinity levels, ie they never toggle. | |
159 | */ | |
160 | for_each_possible_cpu(i) | |
161 | mask |= (cpu_logical_map(i) ^ cpu_logical_map(0)); | |
162 | pr_debug("mask of set bits %#llx\n", mask); | |
163 | /* | |
164 | * Find and stash the last and first bit set at all affinity levels to | |
165 | * check how many bits are required to represent them. | |
166 | */ | |
167 | for (i = 0; i < 4; i++) { | |
168 | affinity = MPIDR_AFFINITY_LEVEL(mask, i); | |
169 | /* | |
170 | * Find the MSB bit and LSB bits position | |
171 | * to determine how many bits are required | |
172 | * to express the affinity level. | |
173 | */ | |
174 | ls = fls(affinity); | |
175 | fs[i] = affinity ? ffs(affinity) - 1 : 0; | |
176 | bits[i] = ls - fs[i]; | |
177 | } | |
178 | /* | |
179 | * An index can be created from the MPIDR_EL1 by isolating the | |
180 | * significant bits at each affinity level and by shifting | |
181 | * them in order to compress the 32 bits values space to a | |
182 | * compressed set of values. This is equivalent to hashing | |
183 | * the MPIDR_EL1 through shifting and ORing. It is a collision free | |
184 | * hash though not minimal since some levels might contain a number | |
185 | * of CPUs that is not an exact power of 2 and their bit | |
186 | * representation might contain holes, eg MPIDR_EL1[7:0] = {0x2, 0x80}. | |
187 | */ | |
188 | mpidr_hash.shift_aff[0] = MPIDR_LEVEL_SHIFT(0) + fs[0]; | |
189 | mpidr_hash.shift_aff[1] = MPIDR_LEVEL_SHIFT(1) + fs[1] - bits[0]; | |
190 | mpidr_hash.shift_aff[2] = MPIDR_LEVEL_SHIFT(2) + fs[2] - | |
191 | (bits[1] + bits[0]); | |
192 | mpidr_hash.shift_aff[3] = MPIDR_LEVEL_SHIFT(3) + | |
193 | fs[3] - (bits[2] + bits[1] + bits[0]); | |
194 | mpidr_hash.mask = mask; | |
195 | mpidr_hash.bits = bits[3] + bits[2] + bits[1] + bits[0]; | |
196 | pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] aff3[%u] mask[%#llx] bits[%u]\n", | |
197 | mpidr_hash.shift_aff[0], | |
198 | mpidr_hash.shift_aff[1], | |
199 | mpidr_hash.shift_aff[2], | |
200 | mpidr_hash.shift_aff[3], | |
201 | mpidr_hash.mask, | |
202 | mpidr_hash.bits); | |
203 | /* | |
204 | * 4x is an arbitrary value used to warn on a hash table much bigger | |
205 | * than expected on most systems. | |
206 | */ | |
207 | if (mpidr_hash_size() > 4 * num_possible_cpus()) | |
208 | pr_warn("Large number of MPIDR hash buckets detected\n"); | |
209 | __flush_dcache_area(&mpidr_hash, sizeof(struct mpidr_hash)); | |
210 | } | |
211 | #endif | |
212 | ||
667f3fd3 MR |
213 | static void __init hyp_mode_check(void) |
214 | { | |
215 | if (is_hyp_mode_available()) | |
216 | pr_info("CPU: All CPU(s) started at EL2\n"); | |
217 | else if (is_hyp_mode_mismatched()) | |
218 | WARN_TAINT(1, TAINT_CPU_OUT_OF_SPEC, | |
219 | "CPU: CPUs started in inconsistent modes"); | |
220 | else | |
221 | pr_info("CPU: All CPU(s) started at EL1\n"); | |
222 | } | |
223 | ||
137650aa MR |
224 | void __init do_post_cpus_up_work(void) |
225 | { | |
667f3fd3 | 226 | hyp_mode_check(); |
137650aa MR |
227 | apply_alternatives_all(); |
228 | } | |
229 | ||
230 | #ifdef CONFIG_UP_LATE_INIT | |
231 | void __init up_late_init(void) | |
232 | { | |
233 | do_post_cpus_up_work(); | |
234 | } | |
235 | #endif /* CONFIG_UP_LATE_INIT */ | |
236 | ||
9703d9d7 CM |
237 | static void __init setup_processor(void) |
238 | { | |
4bff28cc | 239 | u64 features, block; |
a41dc0e8 CM |
240 | u32 cwg; |
241 | int cls; | |
9703d9d7 | 242 | |
a591ede4 MZ |
243 | printk("CPU: AArch64 Processor [%08x] revision %d\n", |
244 | read_cpuid_id(), read_cpuid_id() & 15); | |
9703d9d7 | 245 | |
94ed1f2c | 246 | sprintf(init_utsname()->machine, ELF_PLATFORM); |
9703d9d7 | 247 | elf_hwcap = 0; |
4bff28cc | 248 | |
df857416 MR |
249 | cpuinfo_store_boot_cpu(); |
250 | ||
a41dc0e8 CM |
251 | /* |
252 | * Check for sane CTR_EL0.CWG value. | |
253 | */ | |
254 | cwg = cache_type_cwg(); | |
255 | cls = cache_line_size(); | |
256 | if (!cwg) | |
257 | pr_warn("No Cache Writeback Granule information, assuming cache line size %d\n", | |
258 | cls); | |
259 | if (L1_CACHE_BYTES < cls) | |
260 | pr_warn("L1_CACHE_BYTES smaller than the Cache Writeback Granule (%d < %d)\n", | |
261 | L1_CACHE_BYTES, cls); | |
262 | ||
4bff28cc SC |
263 | /* |
264 | * ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks. | |
265 | * The blocks we test below represent incremental functionality | |
266 | * for non-negative values. Negative values are reserved. | |
267 | */ | |
268 | features = read_cpuid(ID_AA64ISAR0_EL1); | |
269 | block = (features >> 4) & 0xf; | |
270 | if (!(block & 0x8)) { | |
271 | switch (block) { | |
272 | default: | |
273 | case 2: | |
274 | elf_hwcap |= HWCAP_PMULL; | |
275 | case 1: | |
276 | elf_hwcap |= HWCAP_AES; | |
277 | case 0: | |
278 | break; | |
279 | } | |
280 | } | |
281 | ||
282 | block = (features >> 8) & 0xf; | |
283 | if (block && !(block & 0x8)) | |
284 | elf_hwcap |= HWCAP_SHA1; | |
285 | ||
286 | block = (features >> 12) & 0xf; | |
287 | if (block && !(block & 0x8)) | |
288 | elf_hwcap |= HWCAP_SHA2; | |
289 | ||
290 | block = (features >> 16) & 0xf; | |
291 | if (block && !(block & 0x8)) | |
292 | elf_hwcap |= HWCAP_CRC32; | |
4cf761cd AB |
293 | |
294 | #ifdef CONFIG_COMPAT | |
295 | /* | |
296 | * ID_ISAR5_EL1 carries similar information as above, but pertaining to | |
297 | * the Aarch32 32-bit execution state. | |
298 | */ | |
299 | features = read_cpuid(ID_ISAR5_EL1); | |
300 | block = (features >> 4) & 0xf; | |
301 | if (!(block & 0x8)) { | |
302 | switch (block) { | |
303 | default: | |
304 | case 2: | |
305 | compat_elf_hwcap2 |= COMPAT_HWCAP2_PMULL; | |
306 | case 1: | |
307 | compat_elf_hwcap2 |= COMPAT_HWCAP2_AES; | |
308 | case 0: | |
309 | break; | |
310 | } | |
311 | } | |
312 | ||
313 | block = (features >> 8) & 0xf; | |
314 | if (block && !(block & 0x8)) | |
315 | compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA1; | |
316 | ||
317 | block = (features >> 12) & 0xf; | |
318 | if (block && !(block & 0x8)) | |
319 | compat_elf_hwcap2 |= COMPAT_HWCAP2_SHA2; | |
320 | ||
321 | block = (features >> 16) & 0xf; | |
322 | if (block && !(block & 0x8)) | |
323 | compat_elf_hwcap2 |= COMPAT_HWCAP2_CRC32; | |
324 | #endif | |
9703d9d7 CM |
325 | } |
326 | ||
327 | static void __init setup_machine_fdt(phys_addr_t dt_phys) | |
328 | { | |
d5189cc5 | 329 | if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys))) { |
9703d9d7 CM |
330 | early_print("\n" |
331 | "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n" | |
d5189cc5 | 332 | "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n" |
9703d9d7 | 333 | "\nPlease check your bootloader.\n", |
d5189cc5 | 334 | dt_phys, phys_to_virt(dt_phys)); |
9703d9d7 CM |
335 | |
336 | while (true) | |
337 | cpu_relax(); | |
338 | } | |
5e39977e | 339 | |
44b82b77 | 340 | dump_stack_set_arch_desc("%s (DT)", of_flat_dt_get_machine_name()); |
9703d9d7 CM |
341 | } |
342 | ||
9703d9d7 CM |
343 | static void __init request_standard_resources(void) |
344 | { | |
345 | struct memblock_region *region; | |
346 | struct resource *res; | |
347 | ||
348 | kernel_code.start = virt_to_phys(_text); | |
349 | kernel_code.end = virt_to_phys(_etext - 1); | |
350 | kernel_data.start = virt_to_phys(_sdata); | |
351 | kernel_data.end = virt_to_phys(_end - 1); | |
352 | ||
353 | for_each_memblock(memory, region) { | |
354 | res = alloc_bootmem_low(sizeof(*res)); | |
355 | res->name = "System RAM"; | |
356 | res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); | |
357 | res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; | |
358 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
359 | ||
360 | request_resource(&iomem_resource, res); | |
361 | ||
362 | if (kernel_code.start >= res->start && | |
363 | kernel_code.end <= res->end) | |
364 | request_resource(res, &kernel_code); | |
365 | if (kernel_data.start >= res->start && | |
366 | kernel_data.end <= res->end) | |
367 | request_resource(res, &kernel_data); | |
368 | } | |
369 | } | |
370 | ||
4c7aa002 JM |
371 | u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; |
372 | ||
9703d9d7 CM |
373 | void __init setup_arch(char **cmdline_p) |
374 | { | |
375 | setup_processor(); | |
376 | ||
377 | setup_machine_fdt(__fdt_pointer); | |
378 | ||
379 | init_mm.start_code = (unsigned long) _text; | |
380 | init_mm.end_code = (unsigned long) _etext; | |
381 | init_mm.end_data = (unsigned long) _edata; | |
382 | init_mm.brk = (unsigned long) _end; | |
383 | ||
384 | *cmdline_p = boot_command_line; | |
385 | ||
af86e597 | 386 | early_fixmap_init(); |
bf4b558e | 387 | early_ioremap_init(); |
0bf757c7 | 388 | |
9703d9d7 CM |
389 | parse_early_param(); |
390 | ||
7a9c43be JM |
391 | /* |
392 | * Unmask asynchronous aborts after bringing up possible earlycon. | |
393 | * (Report possible System Errors once we can report this occurred) | |
394 | */ | |
395 | local_async_enable(); | |
396 | ||
f84d0275 | 397 | efi_init(); |
9703d9d7 CM |
398 | arm64_memblock_init(); |
399 | ||
37655163 AS |
400 | /* Parse the ACPI tables for possible boot-time configuration */ |
401 | acpi_boot_table_init(); | |
402 | ||
9703d9d7 CM |
403 | paging_init(); |
404 | request_standard_resources(); | |
405 | ||
0e63ea48 | 406 | early_ioremap_reset(); |
f84d0275 | 407 | |
fb094eb1 | 408 | if (acpi_disabled) { |
3505f30f | 409 | unflatten_device_tree(); |
7c59a3df | 410 | psci_dt_init(); |
fccb9a81 HG |
411 | cpu_read_bootcpu_ops(); |
412 | #ifdef CONFIG_SMP | |
413 | of_smp_init_cpus(); | |
414 | #endif | |
7c59a3df GG |
415 | } else { |
416 | psci_acpi_init(); | |
fccb9a81 | 417 | acpi_init_cpus(); |
7c59a3df | 418 | } |
e790f1de | 419 | |
9703d9d7 | 420 | #ifdef CONFIG_SMP |
976d7d3f | 421 | smp_build_mpidr_hash(); |
9703d9d7 CM |
422 | #endif |
423 | ||
424 | #ifdef CONFIG_VT | |
425 | #if defined(CONFIG_VGA_CONSOLE) | |
426 | conswitchp = &vga_con; | |
427 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
428 | conswitchp = &dummy_con; | |
429 | #endif | |
430 | #endif | |
da9c177d AB |
431 | if (boot_args[1] || boot_args[2] || boot_args[3]) { |
432 | pr_err("WARNING: x1-x3 nonzero in violation of boot protocol:\n" | |
433 | "\tx1: %016llx\n\tx2: %016llx\n\tx3: %016llx\n" | |
434 | "This indicates a broken bootloader or old kernel\n", | |
435 | boot_args[1], boot_args[2], boot_args[3]); | |
436 | } | |
9703d9d7 CM |
437 | } |
438 | ||
c560ecfe | 439 | static int __init arm64_device_init(void) |
de79a64d | 440 | { |
78d51e0b | 441 | of_iommu_init(); |
c560ecfe | 442 | of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); |
de79a64d CM |
443 | return 0; |
444 | } | |
6ecba8eb | 445 | arch_initcall_sync(arm64_device_init); |
de79a64d | 446 | |
9703d9d7 CM |
447 | static int __init topology_init(void) |
448 | { | |
449 | int i; | |
450 | ||
451 | for_each_possible_cpu(i) { | |
df857416 | 452 | struct cpu *cpu = &per_cpu(cpu_data.cpu, i); |
9703d9d7 CM |
453 | cpu->hotpluggable = 1; |
454 | register_cpu(cpu, i); | |
455 | } | |
456 | ||
457 | return 0; | |
458 | } | |
459 | subsys_initcall(topology_init); | |
460 | ||
461 | static const char *hwcap_str[] = { | |
462 | "fp", | |
463 | "asimd", | |
46efe547 | 464 | "evtstrm", |
4bff28cc SC |
465 | "aes", |
466 | "pmull", | |
467 | "sha1", | |
468 | "sha2", | |
469 | "crc32", | |
9703d9d7 CM |
470 | NULL |
471 | }; | |
472 | ||
44b82b77 MR |
473 | #ifdef CONFIG_COMPAT |
474 | static const char *compat_hwcap_str[] = { | |
475 | "swp", | |
476 | "half", | |
477 | "thumb", | |
478 | "26bit", | |
479 | "fastmult", | |
480 | "fpa", | |
481 | "vfp", | |
482 | "edsp", | |
483 | "java", | |
484 | "iwmmxt", | |
485 | "crunch", | |
486 | "thumbee", | |
487 | "neon", | |
488 | "vfpv3", | |
489 | "vfpv3d16", | |
490 | "tls", | |
491 | "vfpv4", | |
492 | "idiva", | |
493 | "idivt", | |
494 | "vfpd32", | |
495 | "lpae", | |
496 | "evtstrm" | |
497 | }; | |
498 | ||
499 | static const char *compat_hwcap2_str[] = { | |
500 | "aes", | |
501 | "pmull", | |
502 | "sha1", | |
503 | "sha2", | |
504 | "crc32", | |
505 | NULL | |
506 | }; | |
507 | #endif /* CONFIG_COMPAT */ | |
508 | ||
9703d9d7 CM |
509 | static int c_show(struct seq_file *m, void *v) |
510 | { | |
44b82b77 | 511 | int i, j; |
9703d9d7 CM |
512 | |
513 | for_each_online_cpu(i) { | |
44b82b77 MR |
514 | struct cpuinfo_arm64 *cpuinfo = &per_cpu(cpu_data, i); |
515 | u32 midr = cpuinfo->reg_midr; | |
516 | ||
9703d9d7 CM |
517 | /* |
518 | * glibc reads /proc/cpuinfo to determine the number of | |
519 | * online processors, looking for lines beginning with | |
520 | * "processor". Give glibc what it expects. | |
521 | */ | |
522 | #ifdef CONFIG_SMP | |
523 | seq_printf(m, "processor\t: %d\n", i); | |
524 | #endif | |
5e39977e | 525 | |
44b82b77 MR |
526 | /* |
527 | * Dump out the common processor features in a single line. | |
528 | * Userspace should read the hwcaps with getauxval(AT_HWCAP) | |
529 | * rather than attempting to parse this, but there's a body of | |
530 | * software which does already (at least for 32-bit). | |
531 | */ | |
532 | seq_puts(m, "Features\t:"); | |
533 | if (personality(current->personality) == PER_LINUX32) { | |
534 | #ifdef CONFIG_COMPAT | |
535 | for (j = 0; compat_hwcap_str[j]; j++) | |
536 | if (compat_elf_hwcap & (1 << j)) | |
537 | seq_printf(m, " %s", compat_hwcap_str[j]); | |
538 | ||
539 | for (j = 0; compat_hwcap2_str[j]; j++) | |
540 | if (compat_elf_hwcap2 & (1 << j)) | |
541 | seq_printf(m, " %s", compat_hwcap2_str[j]); | |
542 | #endif /* CONFIG_COMPAT */ | |
543 | } else { | |
544 | for (j = 0; hwcap_str[j]; j++) | |
545 | if (elf_hwcap & (1 << j)) | |
546 | seq_printf(m, " %s", hwcap_str[j]); | |
547 | } | |
548 | seq_puts(m, "\n"); | |
549 | ||
550 | seq_printf(m, "CPU implementer\t: 0x%02x\n", | |
551 | MIDR_IMPLEMENTOR(midr)); | |
552 | seq_printf(m, "CPU architecture: 8\n"); | |
553 | seq_printf(m, "CPU variant\t: 0x%x\n", MIDR_VARIANT(midr)); | |
554 | seq_printf(m, "CPU part\t: 0x%03x\n", MIDR_PARTNUM(midr)); | |
555 | seq_printf(m, "CPU revision\t: %d\n\n", MIDR_REVISION(midr)); | |
556 | } | |
5e39977e | 557 | |
9703d9d7 CM |
558 | return 0; |
559 | } | |
560 | ||
561 | static void *c_start(struct seq_file *m, loff_t *pos) | |
562 | { | |
563 | return *pos < 1 ? (void *)1 : NULL; | |
564 | } | |
565 | ||
566 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) | |
567 | { | |
568 | ++*pos; | |
569 | return NULL; | |
570 | } | |
571 | ||
572 | static void c_stop(struct seq_file *m, void *v) | |
573 | { | |
574 | } | |
575 | ||
576 | const struct seq_operations cpuinfo_op = { | |
577 | .start = c_start, | |
578 | .next = c_next, | |
579 | .stop = c_stop, | |
580 | .show = c_show | |
581 | }; |