| /** @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 | |
| } | |
| } |