diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/CpuId.S')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/CpuId.S | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/CpuId.S b/MdePkg/Library/BaseLib/X64/CpuId.S new file mode 100644 index 0000000000..98d7faaa06 --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/CpuId.S @@ -0,0 +1,60 @@ +#------------------------------------------------------------------------------ +# +# Copyright (c) 2006, 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 +# ) +#------------------------------------------------------------------------------ +.global _AsmCpuid; +_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 |