Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2013 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/base/cpu.h" |
| 6 | |
| 7 | #if V8_LIBC_MSVCRT |
| 8 | #include <intrin.h> // __cpuid() |
| 9 | #endif |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 10 | #if V8_OS_LINUX |
| 11 | #include <linux/auxvec.h> // AT_HWCAP |
| 12 | #endif |
| 13 | #if V8_GLIBC_PREREQ(2, 16) |
| 14 | #include <sys/auxv.h> // getauxval() |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 15 | #endif |
| 16 | #if V8_OS_QNX |
| 17 | #include <sys/syspage.h> // cpuinfo |
| 18 | #endif |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 19 | #if V8_OS_LINUX && V8_HOST_ARCH_PPC |
| 20 | #include <elf.h> |
| 21 | #endif |
| 22 | #if V8_OS_AIX |
| 23 | #include <sys/systemcfg.h> // _system_configuration |
| 24 | #ifndef POWER_8 |
| 25 | #define POWER_8 0x10000 |
| 26 | #endif |
| 27 | #endif |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 28 | #if V8_OS_POSIX |
| 29 | #include <unistd.h> // sysconf() |
| 30 | #endif |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 31 | |
| 32 | #include <ctype.h> |
| 33 | #include <limits.h> |
| 34 | #include <stdio.h> |
| 35 | #include <stdlib.h> |
| 36 | #include <string.h> |
| 37 | #include <algorithm> |
| 38 | |
| 39 | #include "src/base/logging.h" |
| 40 | #if V8_OS_WIN |
| 41 | #include "src/base/win32-headers.h" // NOLINT |
| 42 | #endif |
| 43 | |
| 44 | namespace v8 { |
| 45 | namespace base { |
| 46 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 47 | #if defined(__pnacl__) |
| 48 | // Portable host shouldn't do feature detection. |
| 49 | #elif V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 50 | |
| 51 | // Define __cpuid() for non-MSVC libraries. |
| 52 | #if !V8_LIBC_MSVCRT |
| 53 | |
| 54 | static V8_INLINE void __cpuid(int cpu_info[4], int info_type) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 55 | // Clear ecx to align with __cpuid() of MSVC: |
| 56 | // https://msdn.microsoft.com/en-us/library/hskdteyh.aspx |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 57 | #if defined(__i386__) && defined(__pic__) |
| 58 | // Make sure to preserve ebx, which contains the pointer |
| 59 | // to the GOT in case we're generating PIC. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 60 | __asm__ volatile( |
| 61 | "mov %%ebx, %%edi\n\t" |
| 62 | "cpuid\n\t" |
| 63 | "xchg %%edi, %%ebx\n\t" |
| 64 | : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), |
| 65 | "=d"(cpu_info[3]) |
| 66 | : "a"(info_type), "c"(0)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 67 | #else |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 68 | __asm__ volatile("cpuid \n\t" |
| 69 | : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), |
| 70 | "=d"(cpu_info[3]) |
| 71 | : "a"(info_type), "c"(0)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 72 | #endif // defined(__i386__) && defined(__pic__) |
| 73 | } |
| 74 | |
| 75 | #endif // !V8_LIBC_MSVCRT |
| 76 | |
| 77 | #elif V8_HOST_ARCH_ARM || V8_HOST_ARCH_ARM64 \ |
| 78 | || V8_HOST_ARCH_MIPS || V8_HOST_ARCH_MIPS64 |
| 79 | |
| 80 | #if V8_OS_LINUX |
| 81 | |
| 82 | #if V8_HOST_ARCH_ARM |
| 83 | |
| 84 | // See <uapi/asm/hwcap.h> kernel header. |
| 85 | /* |
| 86 | * HWCAP flags - for elf_hwcap (in kernel) and AT_HWCAP |
| 87 | */ |
| 88 | #define HWCAP_SWP (1 << 0) |
| 89 | #define HWCAP_HALF (1 << 1) |
| 90 | #define HWCAP_THUMB (1 << 2) |
| 91 | #define HWCAP_26BIT (1 << 3) /* Play it safe */ |
| 92 | #define HWCAP_FAST_MULT (1 << 4) |
| 93 | #define HWCAP_FPA (1 << 5) |
| 94 | #define HWCAP_VFP (1 << 6) |
| 95 | #define HWCAP_EDSP (1 << 7) |
| 96 | #define HWCAP_JAVA (1 << 8) |
| 97 | #define HWCAP_IWMMXT (1 << 9) |
| 98 | #define HWCAP_CRUNCH (1 << 10) |
| 99 | #define HWCAP_THUMBEE (1 << 11) |
| 100 | #define HWCAP_NEON (1 << 12) |
| 101 | #define HWCAP_VFPv3 (1 << 13) |
| 102 | #define HWCAP_VFPv3D16 (1 << 14) /* also set for VFPv4-D16 */ |
| 103 | #define HWCAP_TLS (1 << 15) |
| 104 | #define HWCAP_VFPv4 (1 << 16) |
| 105 | #define HWCAP_IDIVA (1 << 17) |
| 106 | #define HWCAP_IDIVT (1 << 18) |
| 107 | #define HWCAP_VFPD32 (1 << 19) /* set if VFP has 32 regs (not 16) */ |
| 108 | #define HWCAP_IDIV (HWCAP_IDIVA | HWCAP_IDIVT) |
| 109 | #define HWCAP_LPAE (1 << 20) |
| 110 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 111 | static uint32_t ReadELFHWCaps() { |
| 112 | uint32_t result = 0; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 113 | #if V8_GLIBC_PREREQ(2, 16) |
| 114 | result = static_cast<uint32_t>(getauxval(AT_HWCAP)); |
| 115 | #else |
| 116 | // Read the ELF HWCAP flags by parsing /proc/self/auxv. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 117 | FILE* fp = fopen("/proc/self/auxv", "r"); |
| 118 | if (fp != NULL) { |
| 119 | struct { uint32_t tag; uint32_t value; } entry; |
| 120 | for (;;) { |
| 121 | size_t n = fread(&entry, sizeof(entry), 1, fp); |
| 122 | if (n == 0 || (entry.tag == 0 && entry.value == 0)) { |
| 123 | break; |
| 124 | } |
| 125 | if (entry.tag == AT_HWCAP) { |
| 126 | result = entry.value; |
| 127 | break; |
| 128 | } |
| 129 | } |
| 130 | fclose(fp); |
| 131 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 132 | #endif |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 133 | return result; |
| 134 | } |
| 135 | |
| 136 | #endif // V8_HOST_ARCH_ARM |
| 137 | |
| 138 | #if V8_HOST_ARCH_MIPS |
| 139 | int __detect_fp64_mode(void) { |
| 140 | double result = 0; |
| 141 | // Bit representation of (double)1 is 0x3FF0000000000000. |
Paul Lind | 18a7ebb | 2014-12-17 22:29:32 -0800 | [diff] [blame] | 142 | __asm__ volatile( |
| 143 | ".set push\n\t" |
| 144 | ".set noreorder\n\t" |
| 145 | ".set oddspreg\n\t" |
| 146 | "lui $t0, 0x3FF0\n\t" |
| 147 | "ldc1 $f0, %0\n\t" |
| 148 | "mtc1 $t0, $f1\n\t" |
| 149 | "sdc1 $f0, %0\n\t" |
| 150 | ".set pop\n\t" |
| 151 | : "+m"(result) |
| 152 | : |
| 153 | : "t0", "$f0", "$f1", "memory"); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 154 | |
| 155 | return !(result == 1); |
| 156 | } |
| 157 | |
| 158 | |
| 159 | int __detect_mips_arch_revision(void) { |
| 160 | // TODO(dusmil): Do the specific syscall as soon as it is implemented in mips |
Paul Lind | 18a7ebb | 2014-12-17 22:29:32 -0800 | [diff] [blame] | 161 | // kernel. |
| 162 | uint32_t result = 0; |
| 163 | __asm__ volatile( |
| 164 | "move $v0, $zero\n\t" |
| 165 | // Encoding for "addi $v0, $v0, 1" on non-r6, |
| 166 | // which is encoding for "bovc $v0, %v0, 1" on r6. |
| 167 | // Use machine code directly to avoid compilation errors with different |
| 168 | // toolchains and maintain compatibility. |
| 169 | ".word 0x20420001\n\t" |
| 170 | "sw $v0, %0\n\t" |
| 171 | : "=m"(result) |
| 172 | : |
| 173 | : "v0", "memory"); |
| 174 | // Result is 0 on r6 architectures, 1 on other architecture revisions. |
| 175 | // Fall-back to the least common denominator which is mips32 revision 1. |
| 176 | return result ? 1 : 6; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 177 | } |
| 178 | #endif |
| 179 | |
| 180 | // Extract the information exposed by the kernel via /proc/cpuinfo. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 181 | class CPUInfo final { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 182 | public: |
| 183 | CPUInfo() : datalen_(0) { |
| 184 | // Get the size of the cpuinfo file by reading it until the end. This is |
| 185 | // required because files under /proc do not always return a valid size |
| 186 | // when using fseek(0, SEEK_END) + ftell(). Nor can the be mmap()-ed. |
| 187 | static const char PATHNAME[] = "/proc/cpuinfo"; |
| 188 | FILE* fp = fopen(PATHNAME, "r"); |
| 189 | if (fp != NULL) { |
| 190 | for (;;) { |
| 191 | char buffer[256]; |
| 192 | size_t n = fread(buffer, 1, sizeof(buffer), fp); |
| 193 | if (n == 0) { |
| 194 | break; |
| 195 | } |
| 196 | datalen_ += n; |
| 197 | } |
| 198 | fclose(fp); |
| 199 | } |
| 200 | |
| 201 | // Read the contents of the cpuinfo file. |
| 202 | data_ = new char[datalen_ + 1]; |
| 203 | fp = fopen(PATHNAME, "r"); |
| 204 | if (fp != NULL) { |
| 205 | for (size_t offset = 0; offset < datalen_; ) { |
| 206 | size_t n = fread(data_ + offset, 1, datalen_ - offset, fp); |
| 207 | if (n == 0) { |
| 208 | break; |
| 209 | } |
| 210 | offset += n; |
| 211 | } |
| 212 | fclose(fp); |
| 213 | } |
| 214 | |
| 215 | // Zero-terminate the data. |
| 216 | data_[datalen_] = '\0'; |
| 217 | } |
| 218 | |
| 219 | ~CPUInfo() { |
| 220 | delete[] data_; |
| 221 | } |
| 222 | |
| 223 | // Extract the content of a the first occurence of a given field in |
| 224 | // the content of the cpuinfo file and return it as a heap-allocated |
| 225 | // string that must be freed by the caller using delete[]. |
| 226 | // Return NULL if not found. |
| 227 | char* ExtractField(const char* field) const { |
| 228 | DCHECK(field != NULL); |
| 229 | |
| 230 | // Look for first field occurence, and ensure it starts the line. |
| 231 | size_t fieldlen = strlen(field); |
| 232 | char* p = data_; |
| 233 | for (;;) { |
| 234 | p = strstr(p, field); |
| 235 | if (p == NULL) { |
| 236 | return NULL; |
| 237 | } |
| 238 | if (p == data_ || p[-1] == '\n') { |
| 239 | break; |
| 240 | } |
| 241 | p += fieldlen; |
| 242 | } |
| 243 | |
| 244 | // Skip to the first colon followed by a space. |
| 245 | p = strchr(p + fieldlen, ':'); |
| 246 | if (p == NULL || !isspace(p[1])) { |
| 247 | return NULL; |
| 248 | } |
| 249 | p += 2; |
| 250 | |
| 251 | // Find the end of the line. |
| 252 | char* q = strchr(p, '\n'); |
| 253 | if (q == NULL) { |
| 254 | q = data_ + datalen_; |
| 255 | } |
| 256 | |
| 257 | // Copy the line into a heap-allocated buffer. |
| 258 | size_t len = q - p; |
| 259 | char* result = new char[len + 1]; |
| 260 | if (result != NULL) { |
| 261 | memcpy(result, p, len); |
| 262 | result[len] = '\0'; |
| 263 | } |
| 264 | return result; |
| 265 | } |
| 266 | |
| 267 | private: |
| 268 | char* data_; |
| 269 | size_t datalen_; |
| 270 | }; |
| 271 | |
| 272 | #if V8_HOST_ARCH_ARM || V8_HOST_ARCH_MIPS || V8_HOST_ARCH_MIPS64 |
| 273 | |
| 274 | // Checks that a space-separated list of items contains one given 'item'. |
| 275 | static bool HasListItem(const char* list, const char* item) { |
| 276 | ssize_t item_len = strlen(item); |
| 277 | const char* p = list; |
| 278 | if (p != NULL) { |
| 279 | while (*p != '\0') { |
| 280 | // Skip whitespace. |
| 281 | while (isspace(*p)) ++p; |
| 282 | |
| 283 | // Find end of current list item. |
| 284 | const char* q = p; |
| 285 | while (*q != '\0' && !isspace(*q)) ++q; |
| 286 | |
| 287 | if (item_len == q - p && memcmp(p, item, item_len) == 0) { |
| 288 | return true; |
| 289 | } |
| 290 | |
| 291 | // Skip to next item. |
| 292 | p = q; |
| 293 | } |
| 294 | } |
| 295 | return false; |
| 296 | } |
| 297 | |
| 298 | #endif // V8_HOST_ARCH_ARM || V8_HOST_ARCH_MIPS || V8_HOST_ARCH_MIPS64 |
| 299 | |
| 300 | #endif // V8_OS_LINUX |
| 301 | |
| 302 | #endif // V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64 |
| 303 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 304 | CPU::CPU() |
| 305 | : stepping_(0), |
| 306 | model_(0), |
| 307 | ext_model_(0), |
| 308 | family_(0), |
| 309 | ext_family_(0), |
| 310 | type_(0), |
| 311 | implementer_(0), |
| 312 | architecture_(0), |
| 313 | variant_(-1), |
| 314 | part_(0), |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 315 | icache_line_size_(UNKNOWN_CACHE_LINE_SIZE), |
| 316 | dcache_line_size_(UNKNOWN_CACHE_LINE_SIZE), |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 317 | has_fpu_(false), |
| 318 | has_cmov_(false), |
| 319 | has_sahf_(false), |
| 320 | has_mmx_(false), |
| 321 | has_sse_(false), |
| 322 | has_sse2_(false), |
| 323 | has_sse3_(false), |
| 324 | has_ssse3_(false), |
| 325 | has_sse41_(false), |
| 326 | has_sse42_(false), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 327 | is_atom_(false), |
| 328 | has_osxsave_(false), |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 329 | has_avx_(false), |
| 330 | has_fma3_(false), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 331 | has_bmi1_(false), |
| 332 | has_bmi2_(false), |
| 333 | has_lzcnt_(false), |
| 334 | has_popcnt_(false), |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 335 | has_idiva_(false), |
| 336 | has_neon_(false), |
| 337 | has_thumb2_(false), |
| 338 | has_vfp_(false), |
| 339 | has_vfp3_(false), |
| 340 | has_vfp3_d32_(false), |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 341 | is_fp64_mode_(false), |
| 342 | has_non_stop_time_stamp_counter_(false) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 343 | memcpy(vendor_, "Unknown", 8); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 344 | #if V8_OS_NACL |
| 345 | // Portable host shouldn't do feature detection. |
| 346 | // TODO(jfb): Remove the hardcoded ARM simulator flags in the build, and |
| 347 | // hardcode them here instead. |
| 348 | #elif V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 349 | int cpu_info[4]; |
| 350 | |
| 351 | // __cpuid with an InfoType argument of 0 returns the number of |
| 352 | // valid Ids in CPUInfo[0] and the CPU identification string in |
| 353 | // the other three array elements. The CPU identification string is |
| 354 | // not in linear order. The code below arranges the information |
| 355 | // in a human readable form. The human readable order is CPUInfo[1] | |
| 356 | // CPUInfo[3] | CPUInfo[2]. CPUInfo[2] and CPUInfo[3] are swapped |
| 357 | // before using memcpy to copy these three array elements to cpu_string. |
| 358 | __cpuid(cpu_info, 0); |
| 359 | unsigned num_ids = cpu_info[0]; |
| 360 | std::swap(cpu_info[2], cpu_info[3]); |
| 361 | memcpy(vendor_, cpu_info + 1, 12); |
| 362 | vendor_[12] = '\0'; |
| 363 | |
| 364 | // Interpret CPU feature information. |
| 365 | if (num_ids > 0) { |
| 366 | __cpuid(cpu_info, 1); |
| 367 | stepping_ = cpu_info[0] & 0xf; |
| 368 | model_ = ((cpu_info[0] >> 4) & 0xf) + ((cpu_info[0] >> 12) & 0xf0); |
| 369 | family_ = (cpu_info[0] >> 8) & 0xf; |
| 370 | type_ = (cpu_info[0] >> 12) & 0x3; |
| 371 | ext_model_ = (cpu_info[0] >> 16) & 0xf; |
| 372 | ext_family_ = (cpu_info[0] >> 20) & 0xff; |
| 373 | has_fpu_ = (cpu_info[3] & 0x00000001) != 0; |
| 374 | has_cmov_ = (cpu_info[3] & 0x00008000) != 0; |
| 375 | has_mmx_ = (cpu_info[3] & 0x00800000) != 0; |
| 376 | has_sse_ = (cpu_info[3] & 0x02000000) != 0; |
| 377 | has_sse2_ = (cpu_info[3] & 0x04000000) != 0; |
| 378 | has_sse3_ = (cpu_info[2] & 0x00000001) != 0; |
| 379 | has_ssse3_ = (cpu_info[2] & 0x00000200) != 0; |
| 380 | has_sse41_ = (cpu_info[2] & 0x00080000) != 0; |
| 381 | has_sse42_ = (cpu_info[2] & 0x00100000) != 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 382 | has_popcnt_ = (cpu_info[2] & 0x00800000) != 0; |
| 383 | has_osxsave_ = (cpu_info[2] & 0x08000000) != 0; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 384 | has_avx_ = (cpu_info[2] & 0x10000000) != 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 385 | has_fma3_ = (cpu_info[2] & 0x00001000) != 0; |
| 386 | |
| 387 | if (family_ == 0x6) { |
| 388 | switch (model_) { |
| 389 | case 0x1c: // SLT |
| 390 | case 0x26: |
| 391 | case 0x36: |
| 392 | case 0x27: |
| 393 | case 0x35: |
| 394 | case 0x37: // SLM |
| 395 | case 0x4a: |
| 396 | case 0x4d: |
| 397 | case 0x4c: // AMT |
| 398 | case 0x6e: |
| 399 | is_atom_ = true; |
| 400 | } |
| 401 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 402 | } |
| 403 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 404 | // There are separate feature flags for VEX-encoded GPR instructions. |
| 405 | if (num_ids >= 7) { |
| 406 | __cpuid(cpu_info, 7); |
| 407 | has_bmi1_ = (cpu_info[1] & 0x00000008) != 0; |
| 408 | has_bmi2_ = (cpu_info[1] & 0x00000100) != 0; |
| 409 | } |
| 410 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 411 | // Query extended IDs. |
| 412 | __cpuid(cpu_info, 0x80000000); |
| 413 | unsigned num_ext_ids = cpu_info[0]; |
| 414 | |
| 415 | // Interpret extended CPU feature information. |
| 416 | if (num_ext_ids > 0x80000000) { |
| 417 | __cpuid(cpu_info, 0x80000001); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 418 | has_lzcnt_ = (cpu_info[2] & 0x00000020) != 0; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 419 | // SAHF must be probed in long mode. |
| 420 | has_sahf_ = (cpu_info[2] & 0x00000001) != 0; |
| 421 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 422 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 423 | // Check if CPU has non stoppable time stamp counter. |
| 424 | const int parameter_containing_non_stop_time_stamp_counter = 0x80000007; |
| 425 | if (num_ext_ids >= parameter_containing_non_stop_time_stamp_counter) { |
| 426 | __cpuid(cpu_info, parameter_containing_non_stop_time_stamp_counter); |
| 427 | has_non_stop_time_stamp_counter_ = (cpu_info[3] & (1 << 8)) != 0; |
| 428 | } |
| 429 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 430 | #elif V8_HOST_ARCH_ARM |
| 431 | |
| 432 | #if V8_OS_LINUX |
| 433 | |
| 434 | CPUInfo cpu_info; |
| 435 | |
| 436 | // Extract implementor from the "CPU implementer" field. |
| 437 | char* implementer = cpu_info.ExtractField("CPU implementer"); |
| 438 | if (implementer != NULL) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 439 | char* end; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 440 | implementer_ = strtol(implementer, &end, 0); |
| 441 | if (end == implementer) { |
| 442 | implementer_ = 0; |
| 443 | } |
| 444 | delete[] implementer; |
| 445 | } |
| 446 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 447 | char* variant = cpu_info.ExtractField("CPU variant"); |
| 448 | if (variant != NULL) { |
| 449 | char* end; |
| 450 | variant_ = strtol(variant, &end, 0); |
| 451 | if (end == variant) { |
| 452 | variant_ = -1; |
| 453 | } |
| 454 | delete[] variant; |
| 455 | } |
| 456 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 457 | // Extract part number from the "CPU part" field. |
| 458 | char* part = cpu_info.ExtractField("CPU part"); |
| 459 | if (part != NULL) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 460 | char* end; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 461 | part_ = strtol(part, &end, 0); |
| 462 | if (end == part) { |
| 463 | part_ = 0; |
| 464 | } |
| 465 | delete[] part; |
| 466 | } |
| 467 | |
| 468 | // Extract architecture from the "CPU Architecture" field. |
| 469 | // The list is well-known, unlike the the output of |
| 470 | // the 'Processor' field which can vary greatly. |
| 471 | // See the definition of the 'proc_arch' array in |
| 472 | // $KERNEL/arch/arm/kernel/setup.c and the 'c_show' function in |
| 473 | // same file. |
| 474 | char* architecture = cpu_info.ExtractField("CPU architecture"); |
| 475 | if (architecture != NULL) { |
| 476 | char* end; |
| 477 | architecture_ = strtol(architecture, &end, 10); |
| 478 | if (end == architecture) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 479 | // Kernels older than 3.18 report "CPU architecture: AArch64" on ARMv8. |
| 480 | if (strcmp(architecture, "AArch64") == 0) { |
| 481 | architecture_ = 8; |
| 482 | } else { |
| 483 | architecture_ = 0; |
| 484 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 485 | } |
| 486 | delete[] architecture; |
| 487 | |
| 488 | // Unfortunately, it seems that certain ARMv6-based CPUs |
| 489 | // report an incorrect architecture number of 7! |
| 490 | // |
| 491 | // See http://code.google.com/p/android/issues/detail?id=10812 |
| 492 | // |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 493 | // We try to correct this by looking at the 'elf_platform' |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 494 | // field reported by the 'Processor' field, which is of the |
| 495 | // form of "(v7l)" for an ARMv7-based CPU, and "(v6l)" for |
| 496 | // an ARMv6-one. For example, the Raspberry Pi is one popular |
| 497 | // ARMv6 device that reports architecture 7. |
| 498 | if (architecture_ == 7) { |
| 499 | char* processor = cpu_info.ExtractField("Processor"); |
| 500 | if (HasListItem(processor, "(v6l)")) { |
| 501 | architecture_ = 6; |
| 502 | } |
| 503 | delete[] processor; |
| 504 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 505 | |
| 506 | // elf_platform moved to the model name field in Linux v3.8. |
| 507 | if (architecture_ == 7) { |
| 508 | char* processor = cpu_info.ExtractField("model name"); |
| 509 | if (HasListItem(processor, "(v6l)")) { |
| 510 | architecture_ = 6; |
| 511 | } |
| 512 | delete[] processor; |
| 513 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 514 | } |
| 515 | |
| 516 | // Try to extract the list of CPU features from ELF hwcaps. |
| 517 | uint32_t hwcaps = ReadELFHWCaps(); |
| 518 | if (hwcaps != 0) { |
| 519 | has_idiva_ = (hwcaps & HWCAP_IDIVA) != 0; |
| 520 | has_neon_ = (hwcaps & HWCAP_NEON) != 0; |
| 521 | has_vfp_ = (hwcaps & HWCAP_VFP) != 0; |
| 522 | has_vfp3_ = (hwcaps & (HWCAP_VFPv3 | HWCAP_VFPv3D16 | HWCAP_VFPv4)) != 0; |
| 523 | has_vfp3_d32_ = (has_vfp3_ && ((hwcaps & HWCAP_VFPv3D16) == 0 || |
| 524 | (hwcaps & HWCAP_VFPD32) != 0)); |
| 525 | } else { |
| 526 | // Try to fallback to "Features" CPUInfo field. |
| 527 | char* features = cpu_info.ExtractField("Features"); |
| 528 | has_idiva_ = HasListItem(features, "idiva"); |
| 529 | has_neon_ = HasListItem(features, "neon"); |
| 530 | has_thumb2_ = HasListItem(features, "thumb2"); |
| 531 | has_vfp_ = HasListItem(features, "vfp"); |
| 532 | if (HasListItem(features, "vfpv3d16")) { |
| 533 | has_vfp3_ = true; |
| 534 | } else if (HasListItem(features, "vfpv3")) { |
| 535 | has_vfp3_ = true; |
| 536 | has_vfp3_d32_ = true; |
| 537 | } |
| 538 | delete[] features; |
| 539 | } |
| 540 | |
| 541 | // Some old kernels will report vfp not vfpv3. Here we make an attempt |
| 542 | // to detect vfpv3 by checking for vfp *and* neon, since neon is only |
| 543 | // available on architectures with vfpv3. Checking neon on its own is |
| 544 | // not enough as it is possible to have neon without vfp. |
| 545 | if (has_vfp_ && has_neon_) { |
| 546 | has_vfp3_ = true; |
| 547 | } |
| 548 | |
| 549 | // VFPv3 implies ARMv7, see ARM DDI 0406B, page A1-6. |
| 550 | if (architecture_ < 7 && has_vfp3_) { |
| 551 | architecture_ = 7; |
| 552 | } |
| 553 | |
| 554 | // ARMv7 implies Thumb2. |
| 555 | if (architecture_ >= 7) { |
| 556 | has_thumb2_ = true; |
| 557 | } |
| 558 | |
| 559 | // The earliest architecture with Thumb2 is ARMv6T2. |
| 560 | if (has_thumb2_ && architecture_ < 6) { |
| 561 | architecture_ = 6; |
| 562 | } |
| 563 | |
| 564 | // We don't support any FPUs other than VFP. |
| 565 | has_fpu_ = has_vfp_; |
| 566 | |
| 567 | #elif V8_OS_QNX |
| 568 | |
| 569 | uint32_t cpu_flags = SYSPAGE_ENTRY(cpuinfo)->flags; |
| 570 | if (cpu_flags & ARM_CPU_FLAG_V7) { |
| 571 | architecture_ = 7; |
| 572 | has_thumb2_ = true; |
| 573 | } else if (cpu_flags & ARM_CPU_FLAG_V6) { |
| 574 | architecture_ = 6; |
| 575 | // QNX doesn't say if Thumb2 is available. |
| 576 | // Assume false for the architectures older than ARMv7. |
| 577 | } |
| 578 | DCHECK(architecture_ >= 6); |
| 579 | has_fpu_ = (cpu_flags & CPU_FLAG_FPU) != 0; |
| 580 | has_vfp_ = has_fpu_; |
| 581 | if (cpu_flags & ARM_CPU_FLAG_NEON) { |
| 582 | has_neon_ = true; |
| 583 | has_vfp3_ = has_vfp_; |
| 584 | #ifdef ARM_CPU_FLAG_VFP_D32 |
| 585 | has_vfp3_d32_ = (cpu_flags & ARM_CPU_FLAG_VFP_D32) != 0; |
| 586 | #endif |
| 587 | } |
| 588 | has_idiva_ = (cpu_flags & ARM_CPU_FLAG_IDIV) != 0; |
| 589 | |
| 590 | #endif // V8_OS_LINUX |
| 591 | |
| 592 | #elif V8_HOST_ARCH_MIPS || V8_HOST_ARCH_MIPS64 |
| 593 | |
| 594 | // Simple detection of FPU at runtime for Linux. |
| 595 | // It is based on /proc/cpuinfo, which reveals hardware configuration |
| 596 | // to user-space applications. According to MIPS (early 2010), no similar |
| 597 | // facility is universally available on the MIPS architectures, |
| 598 | // so it's up to individual OSes to provide such. |
| 599 | CPUInfo cpu_info; |
| 600 | char* cpu_model = cpu_info.ExtractField("cpu model"); |
| 601 | has_fpu_ = HasListItem(cpu_model, "FPU"); |
| 602 | delete[] cpu_model; |
| 603 | #ifdef V8_HOST_ARCH_MIPS |
| 604 | is_fp64_mode_ = __detect_fp64_mode(); |
| 605 | architecture_ = __detect_mips_arch_revision(); |
| 606 | #endif |
| 607 | |
| 608 | #elif V8_HOST_ARCH_ARM64 |
| 609 | |
| 610 | CPUInfo cpu_info; |
| 611 | |
| 612 | // Extract implementor from the "CPU implementer" field. |
| 613 | char* implementer = cpu_info.ExtractField("CPU implementer"); |
| 614 | if (implementer != NULL) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 615 | char* end; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 616 | implementer_ = strtol(implementer, &end, 0); |
| 617 | if (end == implementer) { |
| 618 | implementer_ = 0; |
| 619 | } |
| 620 | delete[] implementer; |
| 621 | } |
| 622 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 623 | char* variant = cpu_info.ExtractField("CPU variant"); |
| 624 | if (variant != NULL) { |
| 625 | char* end; |
| 626 | variant_ = strtol(variant, &end, 0); |
| 627 | if (end == variant) { |
| 628 | variant_ = -1; |
| 629 | } |
| 630 | delete[] variant; |
| 631 | } |
| 632 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 633 | // Extract part number from the "CPU part" field. |
| 634 | char* part = cpu_info.ExtractField("CPU part"); |
| 635 | if (part != NULL) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 636 | char* end; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 637 | part_ = strtol(part, &end, 0); |
| 638 | if (end == part) { |
| 639 | part_ = 0; |
| 640 | } |
| 641 | delete[] part; |
| 642 | } |
| 643 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 644 | #elif V8_HOST_ARCH_PPC |
| 645 | |
| 646 | #ifndef USE_SIMULATOR |
| 647 | #if V8_OS_LINUX |
| 648 | // Read processor info from /proc/self/auxv. |
| 649 | char* auxv_cpu_type = NULL; |
| 650 | FILE* fp = fopen("/proc/self/auxv", "r"); |
| 651 | if (fp != NULL) { |
| 652 | #if V8_TARGET_ARCH_PPC64 |
| 653 | Elf64_auxv_t entry; |
| 654 | #else |
| 655 | Elf32_auxv_t entry; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 656 | #endif |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 657 | for (;;) { |
| 658 | size_t n = fread(&entry, sizeof(entry), 1, fp); |
| 659 | if (n == 0 || entry.a_type == AT_NULL) { |
| 660 | break; |
| 661 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 662 | switch (entry.a_type) { |
| 663 | case AT_PLATFORM: |
| 664 | auxv_cpu_type = reinterpret_cast<char*>(entry.a_un.a_val); |
| 665 | break; |
| 666 | case AT_ICACHEBSIZE: |
| 667 | icache_line_size_ = entry.a_un.a_val; |
| 668 | break; |
| 669 | case AT_DCACHEBSIZE: |
| 670 | dcache_line_size_ = entry.a_un.a_val; |
| 671 | break; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 672 | } |
| 673 | } |
| 674 | fclose(fp); |
| 675 | } |
| 676 | |
| 677 | part_ = -1; |
| 678 | if (auxv_cpu_type) { |
| 679 | if (strcmp(auxv_cpu_type, "power8") == 0) { |
| 680 | part_ = PPC_POWER8; |
| 681 | } else if (strcmp(auxv_cpu_type, "power7") == 0) { |
| 682 | part_ = PPC_POWER7; |
| 683 | } else if (strcmp(auxv_cpu_type, "power6") == 0) { |
| 684 | part_ = PPC_POWER6; |
| 685 | } else if (strcmp(auxv_cpu_type, "power5") == 0) { |
| 686 | part_ = PPC_POWER5; |
| 687 | } else if (strcmp(auxv_cpu_type, "ppc970") == 0) { |
| 688 | part_ = PPC_G5; |
| 689 | } else if (strcmp(auxv_cpu_type, "ppc7450") == 0) { |
| 690 | part_ = PPC_G4; |
| 691 | } else if (strcmp(auxv_cpu_type, "pa6t") == 0) { |
| 692 | part_ = PPC_PA6T; |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | #elif V8_OS_AIX |
| 697 | switch (_system_configuration.implementation) { |
| 698 | case POWER_8: |
| 699 | part_ = PPC_POWER8; |
| 700 | break; |
| 701 | case POWER_7: |
| 702 | part_ = PPC_POWER7; |
| 703 | break; |
| 704 | case POWER_6: |
| 705 | part_ = PPC_POWER6; |
| 706 | break; |
| 707 | case POWER_5: |
| 708 | part_ = PPC_POWER5; |
| 709 | break; |
| 710 | } |
| 711 | #endif // V8_OS_AIX |
| 712 | #endif // !USE_SIMULATOR |
| 713 | #endif // V8_HOST_ARCH_PPC |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 714 | } |
| 715 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 716 | } // namespace base |
| 717 | } // namespace v8 |