diff options
Diffstat (limited to 'board/MAI/bios_emulator/scitech/src/pm/dos/vflat.c')
-rw-r--r-- | board/MAI/bios_emulator/scitech/src/pm/dos/vflat.c | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/board/MAI/bios_emulator/scitech/src/pm/dos/vflat.c b/board/MAI/bios_emulator/scitech/src/pm/dos/vflat.c deleted file mode 100644 index c3e9b6c33f8..00000000000 --- a/board/MAI/bios_emulator/scitech/src/pm/dos/vflat.c +++ /dev/null @@ -1,251 +0,0 @@ -/**************************************************************************** -* -* 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 DOS -* -* Description: Main C module for the VFlat framebuffer routines. The page -* fault handler is always installed to handle up to a 4Mb -* framebuffer with a window size of 4Kb or 64Kb in size. -* -****************************************************************************/ - -#include "pmapi.h" -#include <stdlib.h> -#include <dos.h> - -/*-------------------------------------------------------------------------*/ -/* DOS4G/W, PMODE/W and CauseWay support. */ -/*-------------------------------------------------------------------------*/ - -#if defined(DOS4GW) - -#define VFLAT_START_ADDR 0xF0000000U -#define VFLAT_END_ADDR 0xF03FFFFFU -#define VFLAT_LIMIT (VFLAT_END_ADDR - VFLAT_START_ADDR) -#define PAGE_PRESENT 1 -#define PAGE_NOTPRESENT 0 -#define PAGE_READ 0 -#define PAGE_WRITE 2 - -PRIVATE ibool installed = false; -PRIVATE ibool haveDPMI = false; -PUBLIC ibool _ASMAPI VF_haveCauseWay = false; -PUBLIC uchar * _ASMAPI VF_zeroPtr = NULL; - -/* Low level assembler code */ - -int _ASMAPI InitPaging(void); -void _ASMAPI ClosePaging(void); -void _ASMAPI MapPhysical2Linear(ulong pAddr, ulong lAddr, int pages, int flags); -void _ASMAPI InstallFaultHandler(ulong baseAddr,int bankSize); -void _ASMAPI RemoveFaultHandler(void); -void _ASMAPI InstallBankFunc(int codeLen,void *bankFunc); - -void * _ASMAPI VF_malloc(uint size) -{ return PM_malloc(size); } - -void _ASMAPI VF_free(void *p) -{ PM_free(p); } - -PRIVATE ibool CheckDPMI(void) -/**************************************************************************** -* -* Function: CheckDPMI -* Returns: True if we are running under DPMI -* -****************************************************************************/ -{ - PMREGS regs; - - if (haveDPMI) - return true; - - /* Check if we are running under DPMI in which case we will not be - * able to install our page fault handlers. We can however use the - * DVA.386 or VFLATD.386 virtual device drivers if they are present. - */ - regs.x.ax = 0xFF00; - PM_int386(0x31,®s,®s); - if (!regs.x.cflag && (regs.e.edi & 8)) - return (haveDPMI = true); - return false; -} - -ibool PMAPI VF_available(void) -/**************************************************************************** -* -* Function: VF_available -* Returns: True if virtual buffer is available, false if not. -* -****************************************************************************/ -{ - if (!VF_zeroPtr) - VF_zeroPtr = PM_mapPhysicalAddr(0,0xFFFFFFFF,true); - if (CheckDPMI()) - return false; - - /* Standard DOS4GW, PMODE/W and Causeway */ - if (InitPaging() == -1) - return false; - ClosePaging(); - return true; -} - -void * PMAPI InitDPMI(ulong baseAddr,int bankSize,int codeLen,void *bankFunc) -/**************************************************************************** -* -* Function: InitDOS4GW -* Parameters: baseAddr - Base address of framebuffer bank window -* bankSize - Physical size of banks in Kb (4 or 64) -* codeLen - Length of 32 bit bank switch function -* bankFunc - Pointer to protected mode bank function -* Returns: Near pointer to virtual framebuffer, or NULL on failure. -* -* Description: Installs the virtual linear framebuffer handling for -* DPMI environments. This requires the DVA.386 or VFLATD.386 -* virtual device drivers to be installed and functioning. -* -****************************************************************************/ -{ - (void)baseAddr; - (void)bankSize; - (void)codeLen; - (void)bankFunc; - return NULL; -} - -void * PMAPI InitDOS4GW(ulong baseAddr,int bankSize,int codeLen,void *bankFunc) -/**************************************************************************** -* -* Function: InitDOS4GW -* Parameters: baseAddr - Base address of framebuffer bank window -* bankSize - Physical size of banks in Kb (4 or 64) -* codeLen - Length of 32 bit bank switch function -* bankFunc - Pointer to protected mode bank function -* Returns: Near pointer to virtual framebuffer, or NULL on failure. -* -* Description: Installs the virtual linear framebuffer handling for -* the DOS4GW extender. -* -****************************************************************************/ -{ - int i; - - if (InitPaging() == -1) - return NULL; /* Cannot do hardware paging! */ - - /* Map 4MB of video memory into linear address space (read/write) */ - if (bankSize == 64) { - for (i = 0; i < 64; i++) { - MapPhysical2Linear(baseAddr,VFLAT_START_ADDR+(i<<16),16, - PAGE_WRITE | PAGE_NOTPRESENT); - } - } - else { - for (i = 0; i < 1024; i++) { - MapPhysical2Linear(baseAddr,VFLAT_START_ADDR+(i<<12),1, - PAGE_WRITE | PAGE_NOTPRESENT); - } - } - - /* Install our page fault handler and banks switch function */ - InstallFaultHandler(baseAddr,bankSize); - InstallBankFunc(codeLen,bankFunc); - installed = true; - return (void*)VFLAT_START_ADDR; -} - -void * PMAPI VF_init(ulong baseAddr,int bankSize,int codeLen,void *bankFunc) -/**************************************************************************** -* -* Function: VF_init -* Parameters: baseAddr - Base address of framebuffer bank window -* bankSize - Physical size of banks in Kb (4 or 64) -* codeLen - Length of 32 bit bank switch function -* bankFunc - Pointer to protected mode bank function -* Returns: Near pointer to virtual framebuffer, or NULL on failure. -* -* Description: Installs the virtual linear framebuffer handling. -* -****************************************************************************/ -{ - if (installed) - return (void*)VFLAT_START_ADDR; - if (codeLen > 100) - return NULL; /* Bank function is too large! */ - if (!VF_zeroPtr) - VF_zeroPtr = PM_mapPhysicalAddr(0,0xFFFFFFFF,true); - if (CheckDPMI()) - return InitDPMI(baseAddr,bankSize,codeLen,bankFunc); - return InitDOS4GW(baseAddr,bankSize,codeLen,bankFunc); -} - -void PMAPI VF_exit(void) -/**************************************************************************** -* -* Function: VF_exit -* -* Description: Closes down the virtual framebuffer services and -* restores the previous page fault handler. -* -****************************************************************************/ -{ - if (installed) { - if (haveDPMI) { - /* DPMI support */ - } - else { - /* Standard DOS4GW and PMODE/W support */ - RemoveFaultHandler(); - ClosePaging(); - } - installed = false; - } -} - -/*-------------------------------------------------------------------------*/ -/* Support mapped out for other compilers. */ -/*-------------------------------------------------------------------------*/ - -#else - -ibool PMAPI VF_available(void) -{ - return false; -} - -void * PMAPI VF_init(ulong baseAddr,int bankSize,int codeLen,void *bankFunc) -{ - (void)baseAddr; - (void)bankSize; - (void)codeLen; - (void)bankFunc; - return NULL; -} - -void PMAPI VF_exit(void) -{ -} - -#endif |