openh264/codec/common/cpuid.asm

;*!
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;*     Copyright (c)  2009-2013, Cisco Systems
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;*     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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;*
;*
;*	cpu_mmx.asm
;*
;*  Abstract
;*		verify cpuid feature support and cpuid detection
;*
;*  History
;*      04/29/2009	Created
;*
;*************************************************************************/

%include "asm_inc.asm"

;******************************************************************************************
; Macros
;******************************************************************************************


;******************************************************************************************
; 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:
    push    r1
    PUSHRFLAGS
    PUSHRFLAGS

    pop      r1
    mov      eax, r1d
    xor      eax, 00200000h
    xor      eax, r1d
    POPRFLAGS
    pop      r1
    ret

WELS_EXTERN WelsCPUId
ALIGN 16
;****************************************************************************************************
;   void WelsCPUId( int32_t uiIndex, int32_t *pFeatureA, int32_t *pFeatureB, int32_t *pFeatureC, int32_t *pFeatureD )
;****************************************************************************************************
%ifdef       WIN64

WelsCPUId:
    push     rbx
    push     rdx

    mov      eax,     ecx
    mov      rcx,     [r9]
    cpuid
    mov      [r9],    ecx
    mov      [r8],    ebx
    mov      rcx,    [rsp + 2*8 + 40]
    mov      [rcx],   edx
    pop      rdx
    mov      [rdx],   eax

    pop      rbx
    ret

%elifdef     UNIX64
WelsCPUId:
    push     rbx
    push     rcx
    push     rdx

    mov      eax,     edi
    mov      rcx,     [rcx]
    cpuid
    mov      [r8],    edx
    pop      rdx
    pop      r8
    mov      [r8],   ecx
    mov      [rdx],   ebx
    mov      [rsi],   eax

    pop      rbx
    ret

%elifdef     X86_32

WelsCPUId:
    push	ebx
    push	edi

    mov     eax, [esp+12]	; operating index
    mov     edi, [esp+24]
    mov     ecx, [edi]
    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

%endif

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:
%ifdef     WIN64
        mov   eax,    ecx
        mov   ecx,    edx
%elifdef   UNIX64
        mov eax, edi
        mov ecx, esi
%else
        mov eax, [esp+4]
        mov ecx, [esp+8]
%endif

        ; 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:
%ifdef     WIN64
        mov   eax,   ecx
        mov   ecx,   edx
%elifdef   UNIX64
        mov   eax,   edi
        mov   ecx,   esi
%else
	mov eax, [esp+4]
	mov ecx, [esp+8]
%endif
	; 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