MdePkg/Library/BaseLib/Ia32/CpuId.S File Reference


Detailed Description

#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.

# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php.
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
# Module Name:
#
# CpuId.S
#
# Abstract:
#
# AsmCpuid function
#
# Notes:
#
#------------------------------------------------------------------------------

ASM_GLOBAL ASM_PFX(AsmCpuid)

#------------------------------------------------------------------------------
# VOID
# EFIAPI
# AsmCpuid (
# IN UINT32 RegisterInEax,
# OUT UINT32 *RegisterOutEax OPTIONAL,
# OUT UINT32 *RegisterOutEbx OPTIONAL,
# OUT UINT32 *RegisterOutEcx OPTIONAL,
# OUT UINT32 *RegisterOutEdx OPTIONAL
# )
#------------------------------------------------------------------------------
ASM_PFX(AsmCpuid):
push ebx
push ebp
movl esp, ebp
movl 12(ebp), eax
cpuid
push ecx
movl 16(ebp), ecx
jecxz L1
movl eax, (ecx)
L1:
movl 20(ebp), ecx
jecxz L2
movl ebx, (ecx)
L2:
movl 24(ebp), ecx
jecxz L3
popl (ecx)
L3:
movl 28(ebp), ecx
jecxz L4
movl edx, (ecx)
L4:
movl 12(ebp), eax
leave
pop ebx
ret


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