/** @file | |
AsmReadCr4 function | |
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
/** | |
Reads the current value of the Control Register 4 (CR4). | |
Reads and returns the current value of CR4. This function is only available | |
on IA-32 and x64. This returns a 32-bit value on IA-32 and a 64-bit value on | |
x64. | |
@return The value of the Control Register 4 (CR4). | |
**/ | |
UINTN | |
EFIAPI | |
AsmReadCr4 ( | |
VOID | |
) | |
{ | |
__asm { | |
_emit 0x0f // mov eax, cr4 | |
_emit 0x20 | |
_emit 0xE0 | |
} | |
} |