MdePkg/Library/BaseLib/X64/CpuIdEx.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:
#
# CpuIdEx.S
#
# Abstract:
#
# AsmCpuidEx function
#
# Notes:
#
#------------------------------------------------------------------------------

#------------------------------------------------------------------------------
# UINT32
# EFIAPI
# AsmCpuidEx (
# IN UINT32 RegisterInEax,
# IN UINT32 RegisterInEcx,
# OUT UINT32 *RegisterOutEax OPTIONAL,
# OUT UINT32 *RegisterOutEbx OPTIONAL,
# OUT UINT32 *RegisterOutEcx OPTIONAL,
# OUT UINT32 *RegisterOutEdx OPTIONAL
# )
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(AsmCpuidEx)
ASM_PFX(AsmCpuidEx):
push rbx
movl ecx,eax
movl edx,ecx
push rax # save Index on stack
cpuid
mov 0x38(rsp), r10
test r10, r10
jz L1
mov ecx,(r10)
L1:
mov r8, rcx
jrcxz L2
movl eax,(rcx)
L2:
mov r9, rcx
jrcxz L3
mov ebx, (rcx)
L3:
mov 0x40(rsp), rcx
jrcxz L4
mov edx, (rcx)
L4:
pop rax # restore Index to rax as return value
pop rbx
ret


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