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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10683 6f19259b-4bc3-4df7-8a09-765794883524
61 lines
1.7 KiB
ArmAsm
61 lines
1.7 KiB
ArmAsm
#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php.
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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# Module Name:
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#
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# CpuId.S
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#
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# Abstract:
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#
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# AsmCpuid function
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#
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# Notes:
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#
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# VOID
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# EFIAPI
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# AsmCpuid (
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# IN UINT32 RegisterInEax,
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# OUT UINT32 *RegisterOutEax OPTIONAL,
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# OUT UINT32 *RegisterOutEbx OPTIONAL,
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# OUT UINT32 *RegisterOutEcx OPTIONAL,
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# OUT UINT32 *RegisterOutEdx OPTIONAL
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# )
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#------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(AsmCpuid)
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ASM_PFX(AsmCpuid):
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push %rbx
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mov %ecx, %eax
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push %rax # save Index on stack
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push %rdx
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cpuid
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test %r9, %r9
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jz L1
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mov %ecx, (%r9)
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L1:
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pop %rcx
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jrcxz L2
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mov %eax, (%rcx)
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L2:
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mov %r8, %rcx
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jrcxz L3
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mov %ebx, (%rcx)
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L3:
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mov 0x38(%rsp), %rcx
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jrcxz L4
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mov %edx, (%rcx)
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L4:
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pop %rax # restore Index to rax as return value
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pop %rbx
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ret
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