mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-04 13:23:26 +01:00
34 lines
667 B
C
34 lines
667 B
C
|
/** @file
|
||
|
|
AsmWriteDr4 function
|
||
|
|
|
||
|
|
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
|
||
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
||
|
|
|
||
|
|
**/
|
||
|
|
|
||
|
|
/**
|
||
|
|
Writes a value to Debug Register 4 (DR4).
|
||
|
|
|
||
|
|
Writes and returns a new value to DR4. 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 Dr4.
|
||
|
|
|
||
|
|
@return The value written to Debug Register 4 (DR4).
|
||
|
|
|
||
|
|
**/
|
||
|
|
UINTN
|
||
|
|
EFIAPI
|
||
|
|
AsmWriteDr4 (
|
||
|
|
IN UINTN Value
|
||
|
|
)
|
||
|
|
{
|
||
|
|
_asm {
|
||
|
|
mov eax, Value
|
||
|
|
_emit 0x0f // mov dr4, eax
|
||
|
|
_emit 0x23
|
||
|
|
_emit 0xe0
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|