[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / DisableCache.c

/** @file\r
  AsmDisableCache function\r
\r
  Copyright (c) 2006 - 2008, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
/**\r
  Disables caches.\r
\r
  Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a\r
  WBINVD instruction.\r
\r
**/\r
VOID\r
EFIAPI\r
AsmDisableCache (\r
  VOID\r
  )\r
{\r
  _asm {\r
    mov     eax, cr0\r
    bts     eax, 30\r
    btr     eax, 29\r
    mov     cr0, eax\r
    wbinvd\r
  }\r
}\r
\r
Commit	Line	Data
9f4f2f0e	1	/** @file\r
	2	AsmDisableCache function\r
	3	\r
	4	Copyright (c) 2006 - 2008, Intel Corporation<BR>\r
	5	All rights reserved. This program and the accompanying materials\r
	6	are licensed and made available under the terms and conditions of the BSD License\r
	7	which accompanies this distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
	15	/**\r
	16	Disables caches.\r
	17	\r
	18	Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a\r
	19	WBINVD instruction.\r
	20	\r
	21	**/\r
	22	VOID\r
	23	EFIAPI\r
	24	AsmDisableCache (\r
	25	VOID\r
	26	)\r
	27	{\r
	28	_asm {\r
	29	mov eax, cr0\r
	30	bts eax, 30\r
	31	btr eax, 29\r
	32	mov cr0, eax\r
	33	wbinvd\r
	34	}\r
	35	}\r
	36	\r