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#------------------------------------------------------------------------------
#
# 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:
#
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# 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
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