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/** @file
AsmFlushCacheLine function
Copyright (c) 2006 - 2018, 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.
**/
/**
Flushes a cache line from all the instruction and data caches within the
coherency domain of the CPU.
Flushed the cache line specified by LinearAddress, and returns LinearAddress.
This function is only available on IA-32 and x64.
@param LinearAddress The address of the cache line to flush. If the CPU is
in a physical addressing mode, then LinearAddress is a
physical address. If the CPU is in a virtual
addressing mode, then LinearAddress is a virtual
address.
@return LinearAddress
**/
VOID *
EFIAPI
AsmFlushCacheLine (
IN VOID *LinearAddress
)
{
//
// If the CPU does not support CLFLUSH instruction,
// then promote flush range to flush entire cache.
//
_asm {
mov eax, 1
cpuid
test edx, BIT19
jz NoClflush
mov eax, dword ptr [LinearAddress]
clflush [eax]
jmp Done
NoClflush:
wbinvd
Done:
}
return LinearAddress;
}
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