ref: 4d674231706f0b2b335608e8cb2b93e1586372d6
dir: /processing/src/asm/cpuid.asm/
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;*
;* cpu_mmx.asm
;*
;* Abstract
;* verify cpuid feature support and cpuid detection
;*
;* History
;* 04/29/2009 Created
;*
;*************************************************************************/
bits 32
;******************************************************************************************
; Macros
;******************************************************************************************
%macro WELS_EXTERN 1
%ifdef PREFIX
global _%1
%define %1 _%1
%else
global %1
%endif
%endmacro
;******************************************************************************************
; Code
;******************************************************************************************
SECTION .text
; refer to "The IA-32 Intel(R) Architecture Software Developers Manual, Volume 2A A-M"
; section CPUID - CPU Identification
WELS_EXTERN WelsCPUIdVerify
ALIGN 16
;******************************************************************************************
; int32_t WelsCPUIdVerify()
;******************************************************************************************
WelsCPUIdVerify:
pushfd ; decrease the SP by 4 and load EFLAGS register onto stack, pushfd 32 bit and pushf for 16 bit
pushfd ; need push 2 EFLAGS, one for processing and the another one for storing purpose
pop ecx ; get EFLAGS to bit manipulation
mov eax, ecx ; store into ecx followed
xor eax, 00200000h ; get ID flag (bit 21) of EFLAGS to directly indicate cpuid support or not
xor eax, ecx ; get the ID flag bitwise, eax - 0: not support; otherwise: support
popfd ; store back EFLAGS and keep unchanged for system
ret
WELS_EXTERN WelsCPUId
ALIGN 16
;****************************************************************************************************
; void WelsCPUId( int32_t uiIndex, int32_t *pFeatureA, int32_t *pFeatureB, int32_t *pFeatureC, int32_t *pFeatureD )
;****************************************************************************************************
WelsCPUId:
push ebx
push edi
mov eax, [esp+12] ; operating index
cpuid ; cpuid
; processing various information return
mov edi, [esp+16]
mov [edi], eax
mov edi, [esp+20]
mov [edi], ebx
mov edi, [esp+24]
mov [edi], ecx
mov edi, [esp+28]
mov [edi], edx
pop edi
pop ebx
ret
WELS_EXTERN WelsCPUSupportAVX
; need call after cpuid=1 and eax, ecx flag got then
ALIGN 16
;****************************************************************************************************
; int32_t WelsCPUSupportAVX( uint32_t eax, uint32_t ecx )
;****************************************************************************************************
WelsCPUSupportAVX:
mov eax, [esp+4]
mov ecx, [esp+8]
; refer to detection of AVX addressed in INTEL AVX manual document
and ecx, 018000000H
cmp ecx, 018000000H ; check both OSXSAVE and AVX feature flags
jne avx_not_supported
; processor supports AVX instructions and XGETBV is enabled by OS
mov ecx, 0 ; specify 0 for XFEATURE_ENABLED_MASK register
XGETBV ; result in EDX:EAX
and eax, 06H
cmp eax, 06H ; check OS has enabled both XMM and YMM state support
jne avx_not_supported
mov eax, 1
ret
avx_not_supported:
mov eax, 0
ret
WELS_EXTERN WelsCPUSupportFMA
; need call after cpuid=1 and eax, ecx flag got then
ALIGN 16
;****************************************************************************************************
; int32_t WelsCPUSupportFMA( uint32_t eax, uint32_t ecx )
;****************************************************************************************************
WelsCPUSupportFMA:
mov eax, [esp+4]
mov ecx, [esp+8]
; refer to detection of FMA addressed in INTEL AVX manual document
and ecx, 018001000H
cmp ecx, 018001000H ; check OSXSAVE, AVX, FMA feature flags
jne fma_not_supported
; processor supports AVX,FMA instructions and XGETBV is enabled by OS
mov ecx, 0 ; specify 0 for XFEATURE_ENABLED_MASK register
XGETBV ; result in EDX:EAX
and eax, 06H
cmp eax, 06H ; check OS has enabled both XMM and YMM state support
jne fma_not_supported
mov eax, 1
ret
fma_not_supported:
mov eax, 0
ret
WELS_EXTERN WelsEmms
ALIGN 16
;******************************************************************************************
; void WelsEmms()
;******************************************************************************************
WelsEmms:
emms ; empty mmx technology states
ret