diff options
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/X64/CpuId.nasm')
| -rw-r--r-- | Core/MdePkg/Library/BaseLib/X64/CpuId.nasm | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/X64/CpuId.nasm b/Core/MdePkg/Library/BaseLib/X64/CpuId.nasm new file mode 100644 index 0000000000..8f1e70dc6b --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/X64/CpuId.nasm @@ -0,0 +1,64 @@ +;------------------------------------------------------------------------------
+;
+; 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.Asm
+;
+; Abstract:
+;
+; AsmCpuid function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ DEFAULT REL
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmCpuid (
+; IN UINT32 RegisterInEax,
+; OUT UINT32 *RegisterOutEax OPTIONAL,
+; OUT UINT32 *RegisterOutEbx OPTIONAL,
+; OUT UINT32 *RegisterOutEcx OPTIONAL,
+; OUT UINT32 *RegisterOutEdx OPTIONAL
+; )
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmCpuid)
+ASM_PFX(AsmCpuid):
+ push rbx
+ mov eax, ecx
+ push rax ; save Index on stack
+ push rdx
+ cpuid
+ test r9, r9
+ jz .0
+ mov [r9], ecx
+.0:
+ pop rcx
+ jrcxz .1
+ mov [rcx], eax
+.1:
+ mov rcx, r8
+ jrcxz .2
+ mov [rcx], ebx
+.2:
+ mov rcx, [rsp + 0x38]
+ jrcxz .3
+ mov [rcx], edx
+.3:
+ pop rax ; restore Index to rax as return value
+ pop rbx
+ ret
+
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