#------------------------------------------------------------------------------

#

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

# 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:

#

#------------------------------------------------------------------------------

#------------------------------------------------------------------------------

# VOID

# EFIAPI

# AsmCpuid (

# IN UINT32 RegisterInEax,

# OUT UINT32 *RegisterOutEax OPTIONAL,

# OUT UINT32 *RegisterOutEbx OPTIONAL,

# OUT UINT32 *RegisterOutEcx OPTIONAL,

# OUT UINT32 *RegisterOutEdx OPTIONAL

# )

#------------------------------------------------------------------------------

ASM_GLOBAL ASM_PFX(AsmCpuid)

ASM_PFX(AsmCpuid):

push %rbx

mov %ecx, %eax

push %rax # save Index on stack

push %rdx

cpuid

test %r9, %r9

jz L1

mov %ecx, (%r9)

L1:

pop %rcx

jrcxz L2

mov %eax, (%rcx)

L2:

mov %r8, %rcx

jrcxz L3

mov %ebx, (%rcx)

L3:

mov 0x38(%rsp), %rcx

jrcxz L4

mov %edx, (%rcx)

L4:

pop %rax # restore Index to rax as return value

pop %rbx

ret