MdePkg/Library/BaseLib/Ia32/CpuId.nasm

;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
;
;   CpuId.Asm
;
; Abstract:
;
;   AsmCpuid function
;
; Notes:
;
;------------------------------------------------------------------------------

    SECTION .text

;------------------------------------------------------------------------------
;  VOID
;  EFIAPI
;  AsmCpuid (
;    IN   UINT32  RegisterInEax,
;    OUT  UINT32  *RegisterOutEax  OPTIONAL,
;    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
;    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
;    OUT  UINT32  *RegisterOutEdx  OPTIONAL
;    );
;------------------------------------------------------------------------------
global ASM_PFX(AsmCpuid)
ASM_PFX(AsmCpuid):
    push    ebx
    push    ebp
    mov     ebp, esp
    mov     eax, [ebp + 12]
    cpuid
    push    ecx
    mov     ecx, [ebp + 16]
    jecxz   .0
    mov     [ecx], eax
.0:
    mov     ecx, [ebp + 20]
    jecxz   .1
    mov     [ecx], ebx
.1:
    mov     ecx, [ebp + 24]
    jecxz   .2
    pop     DWORD [ecx]
.2:
    mov     ecx, [ebp + 28]
    jecxz   .3
    mov     [ecx], edx
.3:
    mov     eax, [ebp + 12]
    leave
    pop     ebx
    ret