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46 lines
1.0 KiB
NASM
46 lines
1.0 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2015, 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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; FlushCacheLine.Asm
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;
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; Abstract:
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;
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; AsmFlushCacheLine function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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SECTION .text
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;------------------------------------------------------------------------------
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; VOID *
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; EFIAPI
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; AsmFlushCacheLine (
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; IN VOID *LinearAddress
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(AsmFlushCacheLine)
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ASM_PFX(AsmFlushCacheLine):
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;
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; If the CPU does not support CLFLUSH instruction,
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; then promote flush range to flush entire cache.
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;
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mov eax, 1
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push ebx
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cpuid
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pop ebx
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mov eax, [esp + 4]
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test edx, BIT19
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jz .0
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clflush [eax]
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ret
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.0:
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wbinvd
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ret
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