diff options
Diffstat (limited to 'qemu/roms/ipxe/src/arch/x86/include/ipxe/cpuid.h')
-rw-r--r-- | qemu/roms/ipxe/src/arch/x86/include/ipxe/cpuid.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/arch/x86/include/ipxe/cpuid.h b/qemu/roms/ipxe/src/arch/x86/include/ipxe/cpuid.h new file mode 100644 index 000000000..2f78dfca1 --- /dev/null +++ b/qemu/roms/ipxe/src/arch/x86/include/ipxe/cpuid.h @@ -0,0 +1,78 @@ +#ifndef _IPXE_CPUID_H +#define _IPXE_CPUID_H + +/** @file + * + * x86 CPU feature detection + * + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <stdint.h> + +/** An x86 CPU feature register set */ +struct x86_feature_registers { + /** Features returned via %ecx */ + uint32_t ecx; + /** Features returned via %edx */ + uint32_t edx; +}; + +/** x86 CPU features */ +struct x86_features { + /** Intel-defined features (%eax=0x00000001) */ + struct x86_feature_registers intel; + /** AMD-defined features (%eax=0x80000001) */ + struct x86_feature_registers amd; +}; + +/** CPUID support flag */ +#define CPUID_FLAG 0x00200000UL + +/** CPUID extended function */ +#define CPUID_EXTENDED 0x80000000UL + +/** Get vendor ID and largest standard function */ +#define CPUID_VENDOR_ID 0x00000000UL + +/** Get standard features */ +#define CPUID_FEATURES 0x00000001UL + +/** Get largest extended function */ +#define CPUID_AMD_MAX_FN 0x80000000UL + +/** Extended function existence check */ +#define CPUID_AMD_CHECK 0x80000000UL + +/** Extended function existence check mask */ +#define CPUID_AMD_CHECK_MASK 0xffff0000UL + +/** Get extended features */ +#define CPUID_AMD_FEATURES 0x80000001UL + +/** Get CPU model */ +#define CPUID_MODEL 0x80000002UL + +/** + * Issue CPUID instruction + * + * @v operation CPUID operation + * @v eax Output via %eax + * @v ebx Output via %ebx + * @v ecx Output via %ecx + * @v edx Output via %edx + */ +static inline __attribute__ (( always_inline )) void +cpuid ( uint32_t operation, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, + uint32_t *edx ) { + + __asm__ ( "cpuid" + : "=a" ( *eax ), "=b" ( *ebx ), "=c" ( *ecx ), "=d" ( *edx ) + : "0" ( operation ) ); +} + +extern int cpuid_is_supported ( void ); +extern void x86_features ( struct x86_features *features ); + +#endif /* _IPXE_CPUID_H */ |