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| author | Lukas Larsson <[email protected]> | 2015-07-16 11:24:51 +0200 |
|---|---|---|
| committer | Lukas Larsson <[email protected]> | 2016-02-02 10:45:22 +0100 |
| commit | dc1e3933e633d9d7527e6df044895d12d3845e14 (patch) | |
| tree | 45ae1272d657fc2a47178cfedc1c29105e92c318 /erts/lib_src | |
| parent | 2181f97655906dac3b18333c149c384e1dc81c2b (diff) | |
| download | otp-dc1e3933e633d9d7527e6df044895d12d3845e14.tar.gz otp-dc1e3933e633d9d7527e6df044895d12d3845e14.tar.bz2 otp-dc1e3933e633d9d7527e6df044895d12d3845e14.zip | |
erts: Add rdtscp instruction check
Diffstat (limited to 'erts/lib_src')
| -rw-r--r-- | erts/lib_src/common/ethr_aux.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/erts/lib_src/common/ethr_aux.c b/erts/lib_src/common/ethr_aux.c index 56fecf81b8..fbd870c2b5 100644 --- a/erts/lib_src/common/ethr_aux.c +++ b/erts/lib_src/common/ethr_aux.c @@ -139,6 +139,21 @@ x86_init(void) #endif /* bit 26 of edx is set if we have sse2 */ ethr_runtime__.conf.have_sse2 = (edx & (1 << 26)); + + /* check if we have extended feature set */ + eax = 0x80000000; + ethr_x86_cpuid__(&eax, &ebx, &ecx, &edx); + + if (eax >= 0x80000001) { + /* Get the extended feature set */ + eax = 0x80000001; + ethr_x86_cpuid__(&eax, &ebx, &ecx, &edx); + } else { + eax = ebx = ecx = edx = 0; + } + + /* bit 27 of edx is set if we have rdtscp */ + ethr_runtime__.conf.have_rdtscp = (edx & (1 << 27)); } #endif /* ETHR_X86_RUNTIME_CONF__ */ |