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Diffstat (limited to 'board/MAI/bios_emulator/scitech/src/pm/ntdrv/int86.c')
-rw-r--r-- | board/MAI/bios_emulator/scitech/src/pm/ntdrv/int86.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/board/MAI/bios_emulator/scitech/src/pm/ntdrv/int86.c b/board/MAI/bios_emulator/scitech/src/pm/ntdrv/int86.c new file mode 100644 index 00000000000..f93d9c22e78 --- /dev/null +++ b/board/MAI/bios_emulator/scitech/src/pm/ntdrv/int86.c @@ -0,0 +1,252 @@ +/**************************************************************************** +* +* 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: 32-bit Windows NT device drivers. +* +* Description: Implementation for the real mode software interrupt +* handling functions. +* +****************************************************************************/ + +#include "pmapi.h" +#include "drvlib/os/os.h" +#include "sdd/sddhelp.h" +#include "mtrr.h" +#include "oshdr.h" + +/*----------------------------- Implementation ----------------------------*/ + +/**************************************************************************** +REMARKS: +We do have limited BIOS access under Windows NT device drivers. +****************************************************************************/ +ibool PMAPI PM_haveBIOSAccess(void) +{ + // Return false unless we have full buffer passing! + return false; +} + +/**************************************************************************** +PARAMETERS: +len - Place to store the length of the buffer +rseg - Place to store the real mode segment of the buffer +roff - Place to store the real mode offset of the buffer + +REMARKS: +This function returns the address and length of the global VESA transfer +buffer that is used for communicating with the VESA BIOS functions from +Win16 and Win32 programs under Windows. +****************************************************************************/ +void * PMAPI PM_getVESABuf( + uint *len, + uint *rseg, + uint *roff) +{ + // No buffers supported under Windows NT (Windows XP has them however if + // we ever decide to support this!) + return NULL; +} + +/**************************************************************************** +REMARKS: +Issue a protected mode software interrupt. +****************************************************************************/ +int PMAPI PM_int386( + int intno, + PMREGS *in, + PMREGS *out) +{ + PMSREGS sregs; + PM_segread(&sregs); + return PM_int386x(intno,in,out,&sregs); +} + +/**************************************************************************** +REMARKS: +Map a real mode pointer to a protected mode pointer. +****************************************************************************/ +void * PMAPI PM_mapRealPointer( + uint r_seg, + uint r_off) +{ + // Not used for Windows NT drivers! + return NULL; +} + +/**************************************************************************** +REMARKS: +Allocate a block of real mode memory +****************************************************************************/ +void * PMAPI PM_allocRealSeg( + uint size, + uint *r_seg, + uint *r_off) +{ + // Not supported in NT drivers + (void)size; + (void)r_seg; + (void)r_off; + return NULL; +} + +/**************************************************************************** +REMARKS: +Free a block of real mode memory. +****************************************************************************/ +void PMAPI PM_freeRealSeg( + void *mem) +{ + // Not supported in NT drivers + (void)mem; +} + +/**************************************************************************** +REMARKS: +Issue a real mode interrupt (parameters in DPMI compatible structure) +****************************************************************************/ +void PMAPI DPMI_int86( + int intno, + DPMI_regs *regs) +{ + // Not used in NT drivers +} + +/**************************************************************************** +REMARKS: +Call a V86 real mode function with the specified register values +loaded before the call. The call returns with a far ret. +****************************************************************************/ +void PMAPI PM_callRealMode( + uint seg, + uint off, + RMREGS *regs, + RMSREGS *sregs) +{ + // TODO!! +#if 0 + CLIENT_STRUCT saveRegs; + + /* Bail if we do not have BIOS access (ie: the VxD was dynamically + * loaded, and not statically loaded. + */ + if (!_PM_haveBIOS) + return; + + TRACE("SDDHELP: Entering PM_callRealMode()\n"); + Begin_Nest_V86_Exec(); + LoadV86Registers(&saveRegs,regs,sregs); + Simulate_Far_Call(seg, off); + Resume_Exec(); + ReadV86Registers(&saveRegs,regs,sregs); + End_Nest_Exec(); + TRACE("SDDHELP: Exiting PM_callRealMode()\n"); +#endif +} + +/**************************************************************************** +REMARKS: +Issue a V86 real mode interrupt with the specified register values +loaded before the interrupt. +****************************************************************************/ +int PMAPI PM_int86( + int intno, + RMREGS *in, + RMREGS *out) +{ + // TODO!! +#if 0 + RMSREGS sregs = {0}; + CLIENT_STRUCT saveRegs; + ushort oldDisable; + + /* Disable pass-up to our VxD handler so we directly call BIOS */ + TRACE("SDDHELP: Entering PM_int86()\n"); + if (disableTSRFlag) { + oldDisable = *disableTSRFlag; + *disableTSRFlag = 0; + } + Begin_Nest_V86_Exec(); + LoadV86Registers(&saveRegs,in,&sregs); + Exec_Int(intno); + ReadV86Registers(&saveRegs,out,&sregs); + End_Nest_Exec(); + + /* Re-enable pass-up to our VxD handler if previously enabled */ + if (disableTSRFlag) + *disableTSRFlag = oldDisable; + + TRACE("SDDHELP: Exiting PM_int86()\n"); +#else + *out = *in; +#endif + return out->x.ax; +} + +/**************************************************************************** +REMARKS: +Issue a V86 real mode interrupt with the specified register values +loaded before the interrupt. +****************************************************************************/ +int PMAPI PM_int86x( + int intno, + RMREGS *in, + RMREGS *out, + RMSREGS *sregs) +{ + // TODO!! +#if 0 + CLIENT_STRUCT saveRegs; + ushort oldDisable; + + /* Bail if we do not have BIOS access (ie: the VxD was dynamically + * loaded, and not statically loaded. + */ + if (!_PM_haveBIOS) { + *out = *in; + return out->x.ax; + } + + /* Disable pass-up to our VxD handler so we directly call BIOS */ + TRACE("SDDHELP: Entering PM_int86x()\n"); + if (disableTSRFlag) { + oldDisable = *disableTSRFlag; + *disableTSRFlag = 0; + } + Begin_Nest_V86_Exec(); + LoadV86Registers(&saveRegs,in,sregs); + Exec_Int(intno); + ReadV86Registers(&saveRegs,out,sregs); + End_Nest_Exec(); + + /* Re-enable pass-up to our VxD handler if previously enabled */ + if (disableTSRFlag) + *disableTSRFlag = oldDisable; + + TRACE("SDDHELP: Exiting PM_int86x()\n"); +#else + *out = *in; +#endif + return out->x.ax; +} + |