diff options
Diffstat (limited to 'deps/v8/src/base/cpu.cc')
| -rw-r--r-- | deps/v8/src/base/cpu.cc | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/deps/v8/src/base/cpu.cc b/deps/v8/src/base/cpu.cc index adce69d457..fbfbcf683b 100644 --- a/deps/v8/src/base/cpu.cc +++ b/deps/v8/src/base/cpu.cc @@ -115,8 +115,32 @@ static uint32_t ReadELFHWCaps() { #endif // V8_HOST_ARCH_ARM +#if V8_HOST_ARCH_MIPS +int __detect_fp64_mode(void) { + double result = 0; + // Bit representation of (double)1 is 0x3FF0000000000000. + asm( + "lui $t0, 0x3FF0\n\t" + "ldc1 $f0, %0\n\t" + "mtc1 $t0, $f1\n\t" + "sdc1 $f0, %0\n\t" + : "+m" (result) + : : "t0", "$f0", "$f1", "memory"); + + return !(result == 1); +} + + +int __detect_mips_arch_revision(void) { + // TODO(dusmil): Do the specific syscall as soon as it is implemented in mips + // kernel. Currently fail-back to the least common denominator which is + // mips32 revision 1. + return 1; +} +#endif + // Extract the information exposed by the kernel via /proc/cpuinfo. -class CPUInfo V8_FINAL { +class CPUInfo FINAL { public: CPUInfo() : datalen_(0) { // Get the size of the cpuinfo file by reading it until the end. This is @@ -263,7 +287,8 @@ CPU::CPU() : stepping_(0), has_thumb2_(false), has_vfp_(false), has_vfp3_(false), - has_vfp3_d32_(false) { + has_vfp3_d32_(false), + is_fp64_mode_(false) { memcpy(vendor_, "Unknown", 8); #if V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64 int cpu_info[4]; @@ -466,6 +491,10 @@ CPU::CPU() : stepping_(0), char* cpu_model = cpu_info.ExtractField("cpu model"); has_fpu_ = HasListItem(cpu_model, "FPU"); delete[] cpu_model; +#ifdef V8_HOST_ARCH_MIPS + is_fp64_mode_ = __detect_fp64_mode(); + architecture_ = __detect_mips_arch_revision(); +#endif #elif V8_HOST_ARCH_ARM64 |