88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
#ifndef _IPXE_CPUID_H
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#define _IPXE_CPUID_H
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/** @file
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*
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* x86 CPU feature detection
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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/** An x86 CPU feature register set */
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struct x86_feature_registers {
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/** Features returned via %ecx */
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uint32_t ecx;
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/** Features returned via %edx */
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uint32_t edx;
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};
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/** x86 CPU features */
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struct x86_features {
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/** Intel-defined features (%eax=0x00000001) */
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struct x86_feature_registers intel;
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/** AMD-defined features (%eax=0x80000001) */
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struct x86_feature_registers amd;
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};
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/** CPUID support flag */
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#define CPUID_FLAG 0x00200000UL
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/** CPUID extended function */
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#define CPUID_EXTENDED 0x80000000UL
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/** Get vendor ID and largest standard function */
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#define CPUID_VENDOR_ID 0x00000000UL
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/** Get standard features */
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#define CPUID_FEATURES 0x00000001UL
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/** Hypervisor is present */
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#define CPUID_FEATURES_INTEL_ECX_HYPERVISOR 0x80000000UL
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/** Get largest extended function */
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#define CPUID_AMD_MAX_FN 0x80000000UL
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/** Extended function existence check */
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#define CPUID_AMD_CHECK 0x80000000UL
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/** Extended function existence check mask */
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#define CPUID_AMD_CHECK_MASK 0xffff0000UL
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/** Get extended features */
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#define CPUID_AMD_FEATURES 0x80000001UL
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/** Get CPU model */
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#define CPUID_MODEL 0x80000002UL
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/** Get APM information */
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#define CPUID_APM 0x80000007UL
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/** Invariant TSC */
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#define CPUID_APM_EDX_TSC_INVARIANT 0x00000100UL
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/**
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* Issue CPUID instruction
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*
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* @v function CPUID function
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* @v eax Output via %eax
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* @v ebx Output via %ebx
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* @v ecx Output via %ecx
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* @v edx Output via %edx
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*/
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static inline __attribute__ (( always_inline )) void
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cpuid ( uint32_t function, uint32_t *eax, uint32_t *ebx, uint32_t *ecx,
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uint32_t *edx ) {
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__asm__ ( "cpuid"
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: "=a" ( *eax ), "=b" ( *ebx ), "=c" ( *ecx ), "=d" ( *edx )
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: "0" ( function ) );
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}
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extern int cpuid_supported ( uint32_t function );
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extern void x86_features ( struct x86_features *features );
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#endif /* _IPXE_CPUID_H */
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