1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 4 # This program and the accompanying materials 5 # are licensed and made available under the terms and conditions of the BSD License 6 # which accompanies this distribution. The full text of the license may be found at 7 # http://opensource.org/licenses/bsd-license.php. 8 # 9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 # 12 # Module Name: 13 # 14 # DisableCache.S 15 # 16 # Abstract: 17 # 18 # Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a 19 # WBINVD instruction. 20 # 21 # Notes: 22 # 23 #------------------------------------------------------------------------------ 24 25 #------------------------------------------------------------------------------ 26 # VOID 27 # EFIAPI 28 # AsmDisableCache ( 29 # VOID 30 # ); 31 #------------------------------------------------------------------------------ 32 ASM_GLOBAL ASM_PFX(AsmDisableCache) 33 ASM_PFX(AsmDisableCache): 34 movq %cr0, %rax 35 btsq $30, %rax 36 btrq $29, %rax 37 movq %rax, %cr0 38 wbinvd 39 ret 40
