mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-29 12:35:53 +01:00
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
/** @file
|
|
AsmFlushCacheLine function
|
|
|
|
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
|
|
|
|
|
|
/**
|
|
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;
|
|
}
|
|
|