1 /** @file 2 AsmEnableCache function 3 4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 /** 16 Perform a WBINVD and clear both the CD and NW bits of CR0. 17 18 Enables the caches by executing a WBINVD instruction and then clear both the CD and NW 19 bits of CR0 to 0. This function is only available on IA-32 and x64. 20 21 **/ 22 VOID 23 EFIAPI 24 AsmEnableCache ( 25 VOID 26 ) 27 { 28 _asm { 29 wbinvd 30 mov eax, cr0 31 btr eax, 30 32 btr eax, 29 33 mov cr0, eax 34 } 35 } 36 37
