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#ifndef _IPXE_CPUID_H
#define _IPXE_CPUID_H
/** @file
*
* x86 CPU feature detection
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#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
/** RDRAND instruction is supported */
#define CPUID_FEATURES_INTEL_ECX_RDRAND 0x40000000UL
/** Hypervisor is present */
#define CPUID_FEATURES_INTEL_ECX_HYPERVISOR 0x80000000UL
/** TSC is present */
#define CPUID_FEATURES_INTEL_EDX_TSC 0x00000010UL
/** FXSAVE and FXRSTOR are supported */
#define CPUID_FEATURES_INTEL_EDX_FXSR 0x01000000UL
/** 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
/** Get APM information */
#define CPUID_APM 0x80000007UL
/** Invariant TSC */
#define CPUID_APM_EDX_TSC_INVARIANT 0x00000100UL
/**
* Issue CPUID instruction
*
* @v function CPUID function (input via %eax)
* @v subfunction CPUID subfunction (input via %ecx)
* @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 function, uint32_t subfunction, uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx ) {
__asm__ ( "cpuid"
: "=a" ( *eax ), "=b" ( *ebx ), "=c" ( *ecx ), "=d" ( *edx )
: "0" ( function ), "2" ( subfunction ) );
}
extern int cpuid_supported ( uint32_t function );
extern void x86_features ( struct x86_features *features );
#endif /* _IPXE_CPUID_H */
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