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/****************************************************************************
*
* SciTech OS Portability Manager Library
*
* ========================================================================
*
* The contents of this file are subject to the SciTech MGL Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.scitechsoft.com/mgl-license.txt
*
* Software distributed under the License is distributed on an
* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
*
* The Initial Developer of the Original Code is SciTech Software, Inc.
* All Rights Reserved.
*
* ========================================================================
*
* Language: ANSI C
* Environment: Any
*
* Description: Include file defining the external ring 0 helper functions
* needed by the MTRR module. These functions may be included
* directly for native ring 0 device drivers, or they may
* be calls down to a ring 0 helper device driver where
* appropriate (or the entire MTRR module may be located in
* the device driver if the device driver is 32-bit).
*
****************************************************************************/
#ifndef __MTRR_H
#define __MTRR_H
#include "scitech.h"
/*--------------------------- Function Prototypes -------------------------*/
#ifdef __cplusplus
extern "C" { /* Use "C" linkage when in C++ mode */
#endif
/* Internal functions (requires ring 0 access or helper functions!) */
void MTRR_init(void);
int MTRR_enableWriteCombine(ulong base,ulong size,uint type);
/* External assembler helper functions */
ibool _ASMAPI _MTRR_isRing0(void);
ulong _ASMAPI _MTRR_disableInt(void);
void _ASMAPI _MTRR_restoreInt(ulong flags);
ulong _ASMAPI _MTRR_saveCR4(void);
void _ASMAPI _MTRR_restoreCR4(ulong cr4Val);
uchar _ASMAPI _MTRR_getCx86(uchar reg);
void _ASMAPI _MTRR_setCx86(uchar reg,uchar data);
#ifdef __16BIT__
void _ASMAPI _MTRR_readMSR(ulong reg, ulong far *eax, ulong far *edx);
#else
void _ASMAPI _MTRR_readMSR(ulong reg, ulong *eax, ulong *edx);
#endif
void _ASMAPI _MTRR_writeMSR(ulong reg, ulong eax, ulong edx);
#ifdef __cplusplus
} /* End of "C" linkage for C++ */
#endif
#endif /* __MTRR_H */
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