/** @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; | |
} | |