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https://github.com/CloverHackyColor/CloverBootloader.git
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36 lines
911 B
NASM
36 lines
911 B
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, 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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; WriteMsr64.Asm
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;
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; Abstract:
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;
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; AsmWriteMsr64 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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; UINT64
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; EFIAPI
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; AsmWriteMsr64 (
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; IN UINT32 Index,
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; IN UINT64 Value
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(AsmWriteMsr64)
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ASM_PFX(AsmWriteMsr64):
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mov rax, rdx ; meanwhile, rax <- return value
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shr rdx, 0x20 ; edx:eax contains the value to write
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wrmsr
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ret
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