diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/init-arch.c')
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.c | 37 |
1 files changed, 29 insertions, 8 deletions
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c index ec0eb29faf..d559331d70 100644 --- a/sysdeps/x86_64/multiarch/init-arch.c +++ b/sysdeps/x86_64/multiarch/init-arch.c @@ -24,6 +24,22 @@ struct cpu_features __cpu_features attribute_hidden; +static void +get_common_indeces (void) +{ + asm volatile ("cpuid" + : "=a" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax), + "=b" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ebx), + "=c" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx), + "=d" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].edx) + : "0" (1)); + + unsigned int eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax; + __cpu_features.family = (eax >> 8) & 0x0f; + __cpu_features.model = (eax >> 4) & 0x0f; +} + + void __init_cpu_features (void) { @@ -41,20 +57,25 @@ __init_cpu_features (void) { __cpu_features.kind = arch_kind_intel; - get_common_cpuid: - asm volatile ("cpuid" - : "=a" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax), - "=b" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ebx), - "=c" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx), - "=d" (__cpu_features.cpuid[COMMON_CPUID_INDEX_1].edx) - : "0" (1)); + get_common_indeces (); + + unsigned int eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax; + unsigned int extended_family = (eax >> 20) & 0xff; + unsigned int extended_model = (eax >> 12) & 0xf0; + if (family == 0x0f) + { + __cpu_features.family += extended_family; + __cpu_features.model += extended_model; + } + else if (family == 0x06) + __cpu_features.model += extended_model; } /* This spells out "AuthenticAMD". */ else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) { __cpu_features.kind = arch_kind_amd; - goto get_common_cpuid; + get_common_indeces (); } else __cpu_features.kind = arch_kind_other; |