415 lines
13 KiB
C
415 lines
13 KiB
C
/*
|
|
* DOS memory emulation
|
|
*
|
|
* Copyright 1995 Alexandre Julliard
|
|
* Copyright 1996 Marcus Meissner
|
|
*/
|
|
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "windows.h"
|
|
#include "winbase.h"
|
|
#include "global.h"
|
|
#include "ldt.h"
|
|
#include "miscemu.h"
|
|
#include "module.h"
|
|
#include "debug.h"
|
|
|
|
HANDLE16 DOSMEM_BiosSeg; /* BIOS data segment at 0x40:0 */
|
|
|
|
#pragma pack(1)
|
|
|
|
typedef struct
|
|
{
|
|
WORD Com1Addr; /* 00: COM1 I/O address */
|
|
WORD Com2Addr; /* 02: COM2 I/O address */
|
|
WORD Com3Addr; /* 04: COM3 I/O address */
|
|
WORD Com4Addr; /* 06: COM4 I/O address */
|
|
WORD Lpt1Addr; /* 08: LPT1 I/O address */
|
|
WORD Lpt2Addr; /* 0a: LPT2 I/O address */
|
|
WORD Lpt3Addr; /* 0c: LPT3 I/O address */
|
|
WORD Lpt4Addr; /* 0e: LPT4 I/O address */
|
|
WORD InstalledHardware; /* 10: Installed hardware flags */
|
|
BYTE POSTstatus; /* 12: Power-On Self Test status */
|
|
WORD MemSize WINE_PACKED; /* 13: Base memory size in Kb */
|
|
WORD unused1 WINE_PACKED; /* 15: Manufacturing test scratch pad */
|
|
BYTE KbdFlags1; /* 17: Keyboard flags 1 */
|
|
BYTE KbdFlags2; /* 18: Keyboard flags 2 */
|
|
BYTE unused2; /* 19: Keyboard driver workspace */
|
|
WORD NextKbdCharPtr; /* 1a: Next character in kbd buffer */
|
|
WORD FirstKbdCharPtr; /* 1c: First character in kbd buffer */
|
|
WORD KbdBuffer[16]; /* 1e: Keyboard buffer */
|
|
BYTE DisketteStatus1; /* 3e: Diskette recalibrate status */
|
|
BYTE DisketteStatus2; /* 3f: Diskette motor status */
|
|
BYTE DisketteStatus3; /* 40: Diskette motor timeout */
|
|
BYTE DisketteStatus4; /* 41: Diskette last operation status */
|
|
BYTE DiskStatus[7]; /* 42: Disk status/command bytes */
|
|
BYTE VideoMode; /* 49: Video mode */
|
|
WORD VideoColumns; /* 4a: Number of columns */
|
|
WORD VideoPageSize; /* 4c: Video page size in bytes */
|
|
WORD VideoPageStartAddr; /* 4e: Video page start address */
|
|
BYTE VideoCursorPos[16]; /* 50: Cursor position for 8 pages */
|
|
WORD VideoCursorType; /* 60: Video cursor type */
|
|
BYTE VideoCurPage; /* 62: Video current page */
|
|
WORD VideoCtrlAddr WINE_PACKED; /* 63: Video controller address */
|
|
BYTE VideoReg1; /* 65: Video mode select register */
|
|
BYTE VideoReg2; /* 66: Video CGA palette register */
|
|
DWORD ResetEntry WINE_PACKED; /* 67: Warm reset entry point */
|
|
BYTE LastIRQ; /* 6b: Last unexpected interrupt */
|
|
DWORD Ticks; /* 6c: Ticks since midnight */
|
|
BYTE TicksOverflow; /* 70: Timer overflow if past midnight */
|
|
BYTE CtrlBreakFlag; /* 71: Ctrl-Break flag */
|
|
WORD ResetFlag; /* 72: POST Reset flag */
|
|
BYTE DiskOpStatus; /* 74: Last hard-disk operation status */
|
|
BYTE NbHardDisks; /* 75: Number of hard disks */
|
|
BYTE DiskCtrlByte; /* 76: Disk control byte */
|
|
BYTE DiskIOPort; /* 77: Disk I/O port offset */
|
|
BYTE LptTimeout[4]; /* 78: Timeouts for parallel ports */
|
|
BYTE ComTimeout[4]; /* 7c: Timeouts for serial ports */
|
|
WORD KbdBufferStart; /* 80: Keyboard buffer start */
|
|
WORD KbdBufferEnd; /* 82: Keyboard buffer end */
|
|
} BIOSDATA;
|
|
|
|
#pragma pack(4)
|
|
|
|
static BIOSDATA *pBiosData = NULL;
|
|
static char *DOSMEM_dosmem;
|
|
static char *DOSMEM_top;
|
|
|
|
DWORD DOSMEM_CollateTable;
|
|
|
|
/* use 2 low bits of 'size' for the housekeeping */
|
|
|
|
#define DM_BLOCK_DEBUG 0xABE00000
|
|
#define DM_BLOCK_TERMINAL 0x00000001
|
|
#define DM_BLOCK_FREE 0x00000002
|
|
#define DM_BLOCK_MASK 0x001FFFFC
|
|
|
|
/*
|
|
#define __DOSMEM_DEBUG__
|
|
*/
|
|
|
|
typedef struct {
|
|
unsigned size;
|
|
} dosmem_entry;
|
|
|
|
typedef struct {
|
|
unsigned blocks;
|
|
unsigned free;
|
|
} dosmem_info;
|
|
|
|
static dosmem_entry* root_block = NULL;
|
|
static dosmem_info* info_block = NULL;
|
|
|
|
#define NEXT_BLOCK(block) \
|
|
(dosmem_entry*)(((char*)(block)) + \
|
|
sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK))
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_FillBiosSegment
|
|
*
|
|
* Fill the BIOS data segment with dummy values.
|
|
*/
|
|
static void DOSMEM_FillBiosSegment(void)
|
|
{
|
|
pBiosData = (BIOSDATA *)GlobalLock16( DOSMEM_BiosSeg );
|
|
|
|
/* Clear all unused values */
|
|
memset( pBiosData, 0, sizeof(*pBiosData) );
|
|
|
|
/* FIXME: should check the number of configured drives and ports */
|
|
|
|
pBiosData->Com1Addr = 0x3e8;
|
|
pBiosData->Com2Addr = 0x2e8;
|
|
pBiosData->Lpt1Addr = 0x378;
|
|
pBiosData->Lpt2Addr = 0x278;
|
|
pBiosData->InstalledHardware = 0x8443;
|
|
pBiosData->MemSize = 640;
|
|
pBiosData->NextKbdCharPtr = 0x1e;
|
|
pBiosData->FirstKbdCharPtr = 0x1e;
|
|
pBiosData->VideoMode = 0;
|
|
pBiosData->VideoColumns = 80;
|
|
pBiosData->VideoPageSize = 80 * 25 * 2;
|
|
pBiosData->VideoPageStartAddr = 0xb800;
|
|
pBiosData->VideoCtrlAddr = 0x3d4;
|
|
pBiosData->Ticks = INT1A_GetTicksSinceMidnight();
|
|
pBiosData->NbHardDisks = 2;
|
|
pBiosData->KbdBufferStart = 0x1e;
|
|
pBiosData->KbdBufferEnd = 0x3e;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_InitCollateTable
|
|
*
|
|
* Initialises the collate table (character sorting, language dependent)
|
|
*/
|
|
static void DOSMEM_InitCollateTable()
|
|
{
|
|
DWORD x;
|
|
unsigned char *tbl;
|
|
int i;
|
|
|
|
x = GlobalDOSAlloc(258);
|
|
DOSMEM_CollateTable = MAKELONG(0,(x>>16));
|
|
tbl = DOSMEM_MapRealToLinear(DOSMEM_CollateTable);
|
|
*(WORD*)tbl = 0x100;
|
|
tbl += 2;
|
|
for ( i = 0; i < 0x100; i++) *tbl++ = i;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_InitMemory
|
|
*
|
|
* Initialises the DOS memory structures.
|
|
*/
|
|
static void DOSMEM_InitMemory()
|
|
{
|
|
/* Low 64Kb are reserved for DOS/BIOS so the useable area starts at
|
|
* 1000:0000 and ends at 9FFF:FFEF. */
|
|
|
|
dosmem_entry* dm;
|
|
|
|
DOSMEM_top = DOSMEM_dosmem+0x9FFFC; /* 640K */
|
|
info_block = (dosmem_info*)( DOSMEM_dosmem + 0x10000 );
|
|
|
|
/* first block has to be paragraph-aligned relative to the DOSMEM_dosmem */
|
|
|
|
root_block = (dosmem_entry*)( DOSMEM_dosmem + 0x10000 +
|
|
((((sizeof(dosmem_info) + 0xf) & ~0xf) - sizeof(dosmem_entry))));
|
|
root_block->size = DOSMEM_top - (((char*)root_block) + sizeof(dosmem_entry));
|
|
|
|
info_block->blocks = 0;
|
|
info_block->free = root_block->size;
|
|
|
|
dm = NEXT_BLOCK(root_block);
|
|
dm->size = DM_BLOCK_TERMINAL;
|
|
root_block->size |= DM_BLOCK_FREE
|
|
#ifdef __DOSMEM_DEBUG__
|
|
| DM_BLOCK_DEBUG;
|
|
#endif
|
|
;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_Init
|
|
*
|
|
* Create the dos memory segments, and store them into the KERNEL
|
|
* exported values.
|
|
*/
|
|
BOOL32 DOSMEM_Init(void)
|
|
{
|
|
/* Allocate 1 MB dosmemory
|
|
* - it is mostly wasted but we use can some of it to
|
|
* store internal translation tables, etc...
|
|
*/
|
|
DOSMEM_dosmem = VirtualAlloc( NULL, 0x100000, MEM_COMMIT,
|
|
PAGE_EXECUTE_READWRITE );
|
|
if (!DOSMEM_dosmem)
|
|
{
|
|
fprintf( stderr, "Could not allocate DOS memory.\n" );
|
|
return FALSE;
|
|
}
|
|
DOSMEM_BiosSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0x400,0x100,
|
|
0, FALSE, FALSE, FALSE, NULL );
|
|
DOSMEM_FillBiosSegment();
|
|
DOSMEM_InitMemory();
|
|
DOSMEM_InitCollateTable();
|
|
return TRUE;
|
|
}
|
|
|
|
void DOSMEM_InitExports(HMODULE16 hKernel)
|
|
{
|
|
#define SET_ENTRY_POINT(num,addr) \
|
|
MODULE_SetEntryPoint( hKernel, (num), GLOBAL_CreateBlock( GMEM_FIXED, \
|
|
DOSMEM_dosmem+(addr), 0x10000, hKernel, \
|
|
FALSE, FALSE, FALSE, NULL ))
|
|
|
|
SET_ENTRY_POINT( 183, 0x00000 ); /* KERNEL.183: __0000H */
|
|
SET_ENTRY_POINT( 174, 0xa0000 ); /* KERNEL.174: __A000H */
|
|
SET_ENTRY_POINT( 181, 0xb0000 ); /* KERNEL.181: __B000H */
|
|
SET_ENTRY_POINT( 182, 0xb8000 ); /* KERNEL.182: __B800H */
|
|
SET_ENTRY_POINT( 195, 0xc0000 ); /* KERNEL.195: __C000H */
|
|
SET_ENTRY_POINT( 179, 0xd0000 ); /* KERNEL.179: __D000H */
|
|
SET_ENTRY_POINT( 190, 0xe0000 ); /* KERNEL.190: __E000H */
|
|
SET_ENTRY_POINT( 173, 0xf0000 ); /* KERNEL.173: __ROMBIOS */
|
|
SET_ENTRY_POINT( 194, 0xf0000 ); /* KERNEL.194: __F000H */
|
|
MODULE_SetEntryPoint(hKernel, 193,DOSMEM_BiosSeg); /* KERNEL.193: __0040H */
|
|
|
|
#undef SET_ENTRY_POINT
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_Tick
|
|
*
|
|
* Increment the BIOS tick counter. Called by timer signal handler.
|
|
*/
|
|
void DOSMEM_Tick(void)
|
|
{
|
|
if (pBiosData) pBiosData->Ticks++;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_GetBlock
|
|
*
|
|
* Carve a chunk of the DOS memory block (without selector).
|
|
*/
|
|
LPVOID DOSMEM_GetBlock(UINT32 size, UINT16* pseg)
|
|
{
|
|
UINT32 blocksize;
|
|
char *block = NULL;
|
|
dosmem_entry *dm;
|
|
#ifdef __DOSMEM_DEBUG_
|
|
dosmem_entry *prev = NULL;
|
|
#endif
|
|
|
|
if( size > info_block->free ) return NULL;
|
|
dm = root_block;
|
|
|
|
while (dm && dm->size != DM_BLOCK_TERMINAL)
|
|
{
|
|
#ifdef __DOSMEM_DEBUG__
|
|
if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
|
|
{
|
|
fprintf(stderr,"DOSMEM_GetBlock: MCB overrun! [prev = 0x%08x]\n", 4 + (UINT32)prev);
|
|
return NULL;
|
|
}
|
|
prev = dm;
|
|
#endif
|
|
if( dm->size & DM_BLOCK_FREE )
|
|
{
|
|
dosmem_entry *next = NEXT_BLOCK(dm);
|
|
|
|
while( next->size & DM_BLOCK_FREE ) /* collapse free blocks */
|
|
{
|
|
dm->size += sizeof(dosmem_entry) + (next->size & DM_BLOCK_MASK);
|
|
next->size = (DM_BLOCK_FREE | DM_BLOCK_TERMINAL);
|
|
next = NEXT_BLOCK(dm);
|
|
}
|
|
|
|
blocksize = dm->size & DM_BLOCK_MASK;
|
|
if( blocksize >= size )
|
|
{
|
|
block = ((char*)dm) + sizeof(dosmem_entry);
|
|
if( blocksize - size > 0x20 )
|
|
{
|
|
/* split dm so that the next one stays
|
|
* paragraph-aligned (and dm loses free bit) */
|
|
|
|
dm->size = (((size + 0xf + sizeof(dosmem_entry)) & ~0xf) -
|
|
sizeof(dosmem_entry));
|
|
next = (dosmem_entry*)(((char*)dm) +
|
|
sizeof(dosmem_entry) + dm->size);
|
|
next->size = (blocksize - (dm->size +
|
|
sizeof(dosmem_entry))) | DM_BLOCK_FREE
|
|
#ifdef __DOSMEM_DEBUG__
|
|
| DM_BLOCK_DEBUG
|
|
#endif
|
|
;
|
|
} else dm->size &= DM_BLOCK_MASK;
|
|
|
|
info_block->blocks++;
|
|
info_block->free -= dm->size;
|
|
if( pseg ) *pseg = (block - DOSMEM_dosmem) >> 4;
|
|
#ifdef __DOSMEM_DEBUG__
|
|
dm->size |= DM_BLOCK_DEBUG;
|
|
#endif
|
|
break;
|
|
}
|
|
dm = next;
|
|
}
|
|
else dm = NEXT_BLOCK(dm);
|
|
}
|
|
return (LPVOID)block;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_FreeBlock
|
|
*/
|
|
BOOL32 DOSMEM_FreeBlock(void* ptr)
|
|
{
|
|
if( ptr >= (void*)(((char*)root_block) + sizeof(dosmem_entry)) &&
|
|
ptr < (void*)DOSMEM_top && !((((char*)ptr) - DOSMEM_dosmem) & 0xf) )
|
|
{
|
|
dosmem_entry *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
|
|
|
|
if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
|
|
#ifdef __DOSMEM_DEBUG__
|
|
&& ((dm->size & DM_BLOCK_DEBUG) == DM_BLOCK_DEBUG )
|
|
#endif
|
|
)
|
|
{
|
|
info_block->blocks--;
|
|
info_block->free += dm->size;
|
|
|
|
dm->size |= DM_BLOCK_FREE;
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_MapLinearToDos
|
|
*
|
|
* Linear address to the DOS address space.
|
|
*/
|
|
UINT32 DOSMEM_MapLinearToDos(LPVOID ptr)
|
|
{
|
|
if (((char*)ptr >= DOSMEM_dosmem) &&
|
|
((char*)ptr < DOSMEM_dosmem + 0x100000))
|
|
return (UINT32)ptr - (UINT32)DOSMEM_dosmem;
|
|
return (UINT32)ptr;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_MapDosToLinear
|
|
*
|
|
* DOS linear address to the linear address space.
|
|
*/
|
|
LPVOID DOSMEM_MapDosToLinear(UINT32 ptr)
|
|
{
|
|
if (ptr < 0x100000) return (LPVOID)(ptr + (UINT32)DOSMEM_dosmem);
|
|
return (LPVOID)ptr;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_MapRealToLinear
|
|
*
|
|
* Real mode DOS address into a linear pointer
|
|
*/
|
|
LPVOID DOSMEM_MapRealToLinear(DWORD x)
|
|
{
|
|
LPVOID lin;
|
|
|
|
lin=DOSMEM_dosmem+(x&0xffff)+(((x&0xffff0000)>>16)*16);
|
|
TRACE(selector,"(0x%08lx) returns 0x%p.\n",
|
|
x,lin );
|
|
return lin;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_AllocSelector
|
|
*
|
|
* Allocates a protected mode selector for a realmode segment.
|
|
*/
|
|
WORD DOSMEM_AllocSelector(WORD realsel)
|
|
{
|
|
HMODULE16 hModule = GetModuleHandle16("KERNEL");
|
|
WORD sel;
|
|
|
|
sel=GLOBAL_CreateBlock(
|
|
GMEM_FIXED,DOSMEM_dosmem+realsel*16,0x10000,
|
|
hModule,FALSE,FALSE,FALSE,NULL
|
|
);
|
|
TRACE(selector,"(0x%04x) returns 0x%04x.\n",
|
|
realsel,sel
|
|
);
|
|
return sel;
|
|
}
|
|
|