/** @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 | |
} | |
} |