mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-28 12:25:19 +01:00
34 lines
639 B
C
34 lines
639 B
C
|
/** @file
|
||
|
|
AsmWriteCr4 function
|
||
|
|
|
||
|
|
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
|
||
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
||
|
|
|
||
|
|
**/
|
||
|
|
|
||
|
|
/**
|
||
|
|
Writes a value to Control Register 4 (CR4).
|
||
|
|
|
||
|
|
Writes and returns a new value to CR4. This function is only available on
|
||
|
|
IA-32 and x64. This writes a 32-bit value on IA-32 and a 64-bit value on x64.
|
||
|
|
|
||
|
|
@param Value The value to write to CR4.
|
||
|
|
|
||
|
|
@return The value written to CR4.
|
||
|
|
|
||
|
|
**/
|
||
|
|
UINTN
|
||
|
|
EFIAPI
|
||
|
|
AsmWriteCr4 (
|
||
|
|
UINTN Value
|
||
|
|
)
|
||
|
|
{
|
||
|
|
_asm {
|
||
|
|
mov eax, Value
|
||
|
|
_emit 0x0f // mov cr4, eax
|
||
|
|
_emit 0x22
|
||
|
|
_emit 0xE0
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|