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https://github.com/CloverHackyColor/CloverBootloader.git
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59 lines
1.4 KiB
NASM
59 lines
1.4 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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; Module Name:
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;
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; CpuId.Asm
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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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DEFAULT REL
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SECTION .text
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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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global ASM_PFX(AsmCpuid)
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ASM_PFX(AsmCpuid):
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push rbx
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mov eax, ecx
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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 .0
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mov [r9], ecx
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.0:
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pop rcx
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jrcxz .1
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mov [rcx], eax
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.1:
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mov rcx, r8
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jrcxz .2
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mov [rcx], ebx
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.2:
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mov rcx, [rsp + 0x38]
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jrcxz .3
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mov [rcx], edx
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.3:
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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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