jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 1 | // Copyright 2013 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "cpu.h" |
| 29 | |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 30 | #if V8_CC_MSVC |
| 31 | #include <intrin.h> // __cpuid() |
| 32 | #endif |
| 33 | #if V8_OS_POSIX |
| 34 | #include <unistd.h> // sysconf() |
| 35 | #endif |
| 36 | |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 37 | #include <algorithm> |
| 38 | #include <cctype> |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 39 | #include <climits> |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 40 | #include <cstdio> |
| 41 | #include <cstdlib> |
| 42 | #include <cstring> |
| 43 | |
| 44 | #include "checks.h" |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 45 | #if V8_OS_WIN |
| 46 | #include "win32-headers.h" |
| 47 | #endif |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 48 | |
| 49 | namespace v8 { |
| 50 | namespace internal { |
| 51 | |
| 52 | #if V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64 |
| 53 | |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 54 | // Define __cpuid() for non-MSVC compilers. |
| 55 | #if !V8_CC_MSVC |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 56 | |
dslomov@chromium.org | 4a35c5a | 2013-09-13 07:28:52 +0000 | [diff] [blame] | 57 | static V8_INLINE void __cpuid(int cpu_info[4], int info_type) { |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 58 | #if defined(__i386__) && defined(__pic__) |
| 59 | // Make sure to preserve ebx, which contains the pointer |
| 60 | // to the GOT in case we're generating PIC. |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 61 | __asm__ volatile ( |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 62 | "mov %%ebx, %%edi\n\t" |
| 63 | "cpuid\n\t" |
| 64 | "xchg %%edi, %%ebx\n\t" |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 65 | : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3]) |
| 66 | : "a"(info_type) |
| 67 | ); |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 68 | #else |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 69 | __asm__ volatile ( |
| 70 | "cpuid \n\t" |
| 71 | : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3]) |
| 72 | : "a"(info_type) |
| 73 | ); |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 74 | #endif // defined(__i386__) && defined(__pic__) |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 75 | } |
| 76 | |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 77 | #endif // !V8_CC_MSVC |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 78 | |
| 79 | #elif V8_HOST_ARCH_ARM || V8_HOST_ARCH_MIPS |
| 80 | |
| 81 | #if V8_HOST_ARCH_ARM |
| 82 | |
| 83 | // See <uapi/asm/hwcap.h> kernel header. |
| 84 | /* |
| 85 | * HWCAP flags - for elf_hwcap (in kernel) and AT_HWCAP |
| 86 | */ |
| 87 | #define HWCAP_SWP (1 << 0) |
| 88 | #define HWCAP_HALF (1 << 1) |
| 89 | #define HWCAP_THUMB (1 << 2) |
| 90 | #define HWCAP_26BIT (1 << 3) /* Play it safe */ |
| 91 | #define HWCAP_FAST_MULT (1 << 4) |
| 92 | #define HWCAP_FPA (1 << 5) |
| 93 | #define HWCAP_VFP (1 << 6) |
| 94 | #define HWCAP_EDSP (1 << 7) |
| 95 | #define HWCAP_JAVA (1 << 8) |
| 96 | #define HWCAP_IWMMXT (1 << 9) |
| 97 | #define HWCAP_CRUNCH (1 << 10) |
| 98 | #define HWCAP_THUMBEE (1 << 11) |
| 99 | #define HWCAP_NEON (1 << 12) |
| 100 | #define HWCAP_VFPv3 (1 << 13) |
| 101 | #define HWCAP_VFPv3D16 (1 << 14) /* also set for VFPv4-D16 */ |
| 102 | #define HWCAP_TLS (1 << 15) |
| 103 | #define HWCAP_VFPv4 (1 << 16) |
| 104 | #define HWCAP_IDIVA (1 << 17) |
| 105 | #define HWCAP_IDIVT (1 << 18) |
| 106 | #define HWCAP_VFPD32 (1 << 19) /* set if VFP has 32 regs (not 16) */ |
| 107 | #define HWCAP_IDIV (HWCAP_IDIVA | HWCAP_IDIVT) |
| 108 | #define HWCAP_LPAE (1 << 20) |
| 109 | |
| 110 | #define AT_HWCAP 16 |
| 111 | |
| 112 | // Read the ELF HWCAP flags by parsing /proc/self/auxv. |
| 113 | static uint32_t ReadELFHWCaps() { |
| 114 | uint32_t result = 0; |
| 115 | FILE* fp = fopen("/proc/self/auxv", "r"); |
| 116 | if (fp != NULL) { |
| 117 | struct { uint32_t tag; uint32_t value; } entry; |
| 118 | for (;;) { |
| 119 | size_t n = fread(&entry, sizeof(entry), 1, fp); |
| 120 | if (n == 0 || (entry.tag == 0 && entry.value == 0)) { |
| 121 | break; |
| 122 | } |
| 123 | if (entry.tag == AT_HWCAP) { |
| 124 | result = entry.value; |
| 125 | break; |
| 126 | } |
| 127 | } |
| 128 | fclose(fp); |
| 129 | } |
| 130 | return result; |
| 131 | } |
| 132 | |
| 133 | #endif // V8_HOST_ARCH_ARM |
| 134 | |
| 135 | // Extract the information exposed by the kernel via /proc/cpuinfo. |
| 136 | class CPUInfo V8_FINAL BASE_EMBEDDED { |
| 137 | public: |
| 138 | CPUInfo() : datalen_(0) { |
| 139 | // Get the size of the cpuinfo file by reading it until the end. This is |
| 140 | // required because files under /proc do not always return a valid size |
| 141 | // when using fseek(0, SEEK_END) + ftell(). Nor can the be mmap()-ed. |
| 142 | static const char PATHNAME[] = "/proc/cpuinfo"; |
| 143 | FILE* fp = fopen(PATHNAME, "r"); |
| 144 | if (fp != NULL) { |
| 145 | for (;;) { |
| 146 | char buffer[256]; |
| 147 | size_t n = fread(buffer, 1, sizeof(buffer), fp); |
| 148 | if (n == 0) { |
| 149 | break; |
| 150 | } |
| 151 | datalen_ += n; |
| 152 | } |
| 153 | fclose(fp); |
| 154 | } |
| 155 | |
| 156 | // Read the contents of the cpuinfo file. |
| 157 | data_ = new char[datalen_ + 1]; |
| 158 | fp = fopen(PATHNAME, "r"); |
| 159 | if (fp != NULL) { |
| 160 | for (size_t offset = 0; offset < datalen_; ) { |
| 161 | size_t n = fread(data_ + offset, 1, datalen_ - offset, fp); |
| 162 | if (n == 0) { |
| 163 | break; |
| 164 | } |
| 165 | offset += n; |
| 166 | } |
| 167 | fclose(fp); |
| 168 | } |
| 169 | |
| 170 | // Zero-terminate the data. |
| 171 | data_[datalen_] = '\0'; |
| 172 | } |
| 173 | |
| 174 | ~CPUInfo() { |
| 175 | delete[] data_; |
| 176 | } |
| 177 | |
| 178 | // Extract the content of a the first occurence of a given field in |
| 179 | // the content of the cpuinfo file and return it as a heap-allocated |
| 180 | // string that must be freed by the caller using delete[]. |
| 181 | // Return NULL if not found. |
| 182 | char* ExtractField(const char* field) const { |
| 183 | ASSERT(field != NULL); |
| 184 | |
| 185 | // Look for first field occurence, and ensure it starts the line. |
| 186 | size_t fieldlen = strlen(field); |
| 187 | char* p = data_; |
| 188 | for (;;) { |
| 189 | p = strstr(p, field); |
| 190 | if (p == NULL) { |
| 191 | return NULL; |
| 192 | } |
| 193 | if (p == data_ || p[-1] == '\n') { |
| 194 | break; |
| 195 | } |
| 196 | p += fieldlen; |
| 197 | } |
| 198 | |
| 199 | // Skip to the first colon followed by a space. |
| 200 | p = strchr(p + fieldlen, ':'); |
| 201 | if (p == NULL || !isspace(p[1])) { |
| 202 | return NULL; |
| 203 | } |
| 204 | p += 2; |
| 205 | |
| 206 | // Find the end of the line. |
| 207 | char* q = strchr(p, '\n'); |
| 208 | if (q == NULL) { |
| 209 | q = data_ + datalen_; |
| 210 | } |
| 211 | |
| 212 | // Copy the line into a heap-allocated buffer. |
| 213 | size_t len = q - p; |
| 214 | char* result = new char[len + 1]; |
| 215 | if (result != NULL) { |
| 216 | memcpy(result, p, len); |
| 217 | result[len] = '\0'; |
| 218 | } |
| 219 | return result; |
| 220 | } |
| 221 | |
| 222 | private: |
| 223 | char* data_; |
| 224 | size_t datalen_; |
| 225 | }; |
| 226 | |
| 227 | |
| 228 | // Checks that a space-separated list of items contains one given 'item'. |
| 229 | static bool HasListItem(const char* list, const char* item) { |
| 230 | ssize_t item_len = strlen(item); |
| 231 | const char* p = list; |
| 232 | if (p != NULL) { |
| 233 | while (*p != '\0') { |
| 234 | // Skip whitespace. |
| 235 | while (isspace(*p)) ++p; |
| 236 | |
| 237 | // Find end of current list item. |
| 238 | const char* q = p; |
| 239 | while (*q != '\0' && !isspace(*q)) ++q; |
| 240 | |
| 241 | if (item_len == q - p && memcmp(p, item, item_len) == 0) { |
| 242 | return true; |
| 243 | } |
| 244 | |
| 245 | // Skip to next item. |
| 246 | p = q; |
| 247 | } |
| 248 | } |
| 249 | return false; |
| 250 | } |
| 251 | |
| 252 | #endif // V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64 |
| 253 | |
| 254 | CPU::CPU() : stepping_(0), |
| 255 | model_(0), |
| 256 | ext_model_(0), |
| 257 | family_(0), |
| 258 | ext_family_(0), |
| 259 | type_(0), |
| 260 | implementer_(0), |
| 261 | architecture_(0), |
| 262 | part_(0), |
| 263 | has_fpu_(false), |
| 264 | has_cmov_(false), |
| 265 | has_sahf_(false), |
| 266 | has_mmx_(false), |
| 267 | has_sse_(false), |
| 268 | has_sse2_(false), |
| 269 | has_sse3_(false), |
| 270 | has_ssse3_(false), |
| 271 | has_sse41_(false), |
| 272 | has_sse42_(false), |
| 273 | has_idiva_(false), |
| 274 | has_neon_(false), |
| 275 | has_thumbee_(false), |
| 276 | has_vfp_(false), |
| 277 | has_vfp3_(false), |
| 278 | has_vfp3_d32_(false) { |
| 279 | memcpy(vendor_, "Unknown", 8); |
| 280 | #if V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64 |
| 281 | int cpu_info[4]; |
| 282 | |
| 283 | // __cpuid with an InfoType argument of 0 returns the number of |
| 284 | // valid Ids in CPUInfo[0] and the CPU identification string in |
| 285 | // the other three array elements. The CPU identification string is |
| 286 | // not in linear order. The code below arranges the information |
| 287 | // in a human readable form. The human readable order is CPUInfo[1] | |
| 288 | // CPUInfo[3] | CPUInfo[2]. CPUInfo[2] and CPUInfo[3] are swapped |
| 289 | // before using memcpy to copy these three array elements to cpu_string. |
| 290 | __cpuid(cpu_info, 0); |
| 291 | unsigned num_ids = cpu_info[0]; |
| 292 | std::swap(cpu_info[2], cpu_info[3]); |
| 293 | memcpy(vendor_, cpu_info + 1, 12); |
| 294 | vendor_[12] = '\0'; |
| 295 | |
| 296 | // Interpret CPU feature information. |
| 297 | if (num_ids > 0) { |
| 298 | __cpuid(cpu_info, 1); |
| 299 | stepping_ = cpu_info[0] & 0xf; |
| 300 | model_ = ((cpu_info[0] >> 4) & 0xf) + ((cpu_info[0] >> 12) & 0xf0); |
| 301 | family_ = (cpu_info[0] >> 8) & 0xf; |
| 302 | type_ = (cpu_info[0] >> 12) & 0x3; |
| 303 | ext_model_ = (cpu_info[0] >> 16) & 0xf; |
| 304 | ext_family_ = (cpu_info[0] >> 20) & 0xff; |
| 305 | has_fpu_ = (cpu_info[3] & 0x00000001) != 0; |
| 306 | has_cmov_ = (cpu_info[3] & 0x00008000) != 0; |
| 307 | has_mmx_ = (cpu_info[3] & 0x00800000) != 0; |
| 308 | has_sse_ = (cpu_info[3] & 0x02000000) != 0; |
| 309 | has_sse2_ = (cpu_info[3] & 0x04000000) != 0; |
| 310 | has_sse3_ = (cpu_info[2] & 0x00000001) != 0; |
| 311 | has_ssse3_ = (cpu_info[2] & 0x00000200) != 0; |
| 312 | has_sse41_ = (cpu_info[2] & 0x00080000) != 0; |
| 313 | has_sse42_ = (cpu_info[2] & 0x00100000) != 0; |
| 314 | } |
| 315 | |
| 316 | // Query extended IDs. |
| 317 | __cpuid(cpu_info, 0x80000000); |
| 318 | unsigned num_ext_ids = cpu_info[0]; |
| 319 | |
| 320 | // Interpret extended CPU feature information. |
| 321 | if (num_ext_ids > 0x80000000) { |
| 322 | __cpuid(cpu_info, 0x80000001); |
| 323 | // SAHF is always available in compat/legacy mode, |
| 324 | // but must be probed in long mode. |
| 325 | #if V8_HOST_ARCH_IA32 |
| 326 | has_sahf_ = true; |
| 327 | #else |
| 328 | has_sahf_ = (cpu_info[2] & 0x00000001) != 0; |
| 329 | #endif |
| 330 | } |
| 331 | #elif V8_HOST_ARCH_ARM |
| 332 | CPUInfo cpu_info; |
| 333 | |
| 334 | // Extract implementor from the "CPU implementer" field. |
| 335 | char* implementer = cpu_info.ExtractField("CPU implementer"); |
| 336 | if (implementer != NULL) { |
| 337 | char* end ; |
| 338 | implementer_ = strtol(implementer, &end, 0); |
| 339 | if (end == implementer) { |
| 340 | implementer_ = 0; |
| 341 | } |
| 342 | delete[] implementer; |
| 343 | } |
| 344 | |
| 345 | // Extract part number from the "CPU part" field. |
| 346 | char* part = cpu_info.ExtractField("CPU part"); |
| 347 | if (part != NULL) { |
| 348 | char* end ; |
| 349 | part_ = strtol(part, &end, 0); |
| 350 | if (end == part) { |
| 351 | part_ = 0; |
| 352 | } |
| 353 | delete[] part; |
| 354 | } |
| 355 | |
| 356 | // Extract architecture from the "CPU Architecture" field. |
| 357 | // The list is well-known, unlike the the output of |
| 358 | // the 'Processor' field which can vary greatly. |
| 359 | // See the definition of the 'proc_arch' array in |
| 360 | // $KERNEL/arch/arm/kernel/setup.c and the 'c_show' function in |
| 361 | // same file. |
| 362 | char* architecture = cpu_info.ExtractField("CPU architecture"); |
| 363 | if (architecture != NULL) { |
| 364 | char* end; |
| 365 | architecture_ = strtol(architecture, &end, 10); |
| 366 | if (end == architecture) { |
| 367 | architecture_ = 0; |
| 368 | } |
| 369 | delete[] architecture; |
| 370 | |
| 371 | // Unfortunately, it seems that certain ARMv6-based CPUs |
| 372 | // report an incorrect architecture number of 7! |
| 373 | // |
| 374 | // See http://code.google.com/p/android/issues/detail?id=10812 |
| 375 | // |
| 376 | // We try to correct this by looking at the 'elf_format' |
| 377 | // field reported by the 'Processor' field, which is of the |
| 378 | // form of "(v7l)" for an ARMv7-based CPU, and "(v6l)" for |
| 379 | // an ARMv6-one. For example, the Raspberry Pi is one popular |
| 380 | // ARMv6 device that reports architecture 7. |
| 381 | if (architecture_ == 7) { |
| 382 | char* processor = cpu_info.ExtractField("Processor"); |
| 383 | if (HasListItem(processor, "(v6l)")) { |
| 384 | architecture_ = 6; |
| 385 | } |
| 386 | delete[] processor; |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | // Try to extract the list of CPU features from ELF hwcaps. |
| 391 | uint32_t hwcaps = ReadELFHWCaps(); |
| 392 | if (hwcaps != 0) { |
| 393 | has_idiva_ = (hwcaps & HWCAP_IDIVA) != 0; |
| 394 | has_neon_ = (hwcaps & HWCAP_NEON) != 0; |
| 395 | has_thumbee_ = (hwcaps & HWCAP_THUMBEE) != 0; |
| 396 | has_vfp_ = (hwcaps & HWCAP_VFP) != 0; |
| 397 | has_vfp3_ = (hwcaps & (HWCAP_VFPv3 | HWCAP_VFPv3D16 | HWCAP_VFPv4)) != 0; |
| 398 | has_vfp3_d32_ = (has_vfp3_ && ((hwcaps & HWCAP_VFPv3D16) == 0 || |
| 399 | (hwcaps & HWCAP_VFPD32) != 0)); |
| 400 | } else { |
| 401 | // Try to fallback to "Features" CPUInfo field. |
| 402 | char* features = cpu_info.ExtractField("Features"); |
| 403 | has_idiva_ = HasListItem(features, "idiva"); |
| 404 | has_neon_ = HasListItem(features, "neon"); |
| 405 | has_thumbee_ = HasListItem(features, "thumbee"); |
| 406 | has_vfp_ = HasListItem(features, "vfp"); |
| 407 | if (HasListItem(features, "vfpv3")) { |
| 408 | has_vfp3_ = true; |
| 409 | has_vfp3_d32_ = true; |
| 410 | } else if (HasListItem(features, "vfpv3d16")) { |
| 411 | has_vfp3_ = true; |
| 412 | } |
| 413 | delete[] features; |
| 414 | } |
| 415 | |
| 416 | // Some old kernels will report vfp not vfpv3. Here we make an attempt |
| 417 | // to detect vfpv3 by checking for vfp *and* neon, since neon is only |
| 418 | // available on architectures with vfpv3. Checking neon on its own is |
| 419 | // not enough as it is possible to have neon without vfp. |
| 420 | if (has_vfp_ && has_neon_) { |
| 421 | has_vfp3_ = true; |
| 422 | } |
| 423 | |
| 424 | // VFPv3 implies ARMv7, see ARM DDI 0406B, page A1-6. |
| 425 | if (architecture_ < 7 && has_vfp3_) { |
| 426 | architecture_ = 7; |
| 427 | } |
| 428 | |
| 429 | // ARMv7 implies ThumbEE. |
| 430 | if (architecture_ >= 7) { |
| 431 | has_thumbee_ = true; |
| 432 | } |
| 433 | |
| 434 | // The earliest architecture with ThumbEE is ARMv6T2. |
| 435 | if (has_thumbee_ && architecture_ < 6) { |
| 436 | architecture_ = 6; |
| 437 | } |
| 438 | |
| 439 | // We don't support any FPUs other than VFP. |
| 440 | has_fpu_ = has_vfp_; |
| 441 | #elif V8_HOST_ARCH_MIPS |
| 442 | // Simple detection of FPU at runtime for Linux. |
| 443 | // It is based on /proc/cpuinfo, which reveals hardware configuration |
| 444 | // to user-space applications. According to MIPS (early 2010), no similar |
| 445 | // facility is universally available on the MIPS architectures, |
| 446 | // so it's up to individual OSes to provide such. |
| 447 | CPUInfo cpu_info; |
| 448 | char* cpu_model = cpu_info.ExtractField("cpu model"); |
| 449 | has_fpu_ = HasListItem(cpu_model, "FPU"); |
| 450 | delete[] cpu_model; |
| 451 | #endif |
| 452 | } |
| 453 | |
mstarzinger@chromium.org | 1f410f9 | 2013-08-29 08:13:16 +0000 | [diff] [blame] | 454 | |
| 455 | // static |
| 456 | int CPU::NumberOfProcessorsOnline() { |
| 457 | #if V8_OS_WIN |
| 458 | SYSTEM_INFO info; |
| 459 | GetSystemInfo(&info); |
| 460 | return info.dwNumberOfProcessors; |
| 461 | #else |
| 462 | return static_cast<int>(sysconf(_SC_NPROCESSORS_ONLN)); |
| 463 | #endif |
| 464 | } |
| 465 | |
jkummerow@chromium.org | 1e8da74 | 2013-08-26 17:13:35 +0000 | [diff] [blame] | 466 | } } // namespace v8::internal |