/* * DOS memory emulation * * Copyright 1995 Alexandre Julliard * Copyright 1996 Marcus Meissner * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "config.h" #include "wine/port.h" #include #include #include #include #include #ifdef HAVE_SYS_MMAN_H # include #endif #include "windef.h" #include "winbase.h" #include "winreg.h" #include "excpt.h" #include "winternl.h" #include "wine/winbase16.h" #include "dosexe.h" #include "wine/debug.h" WINE_DEFAULT_DEBUG_CHANNEL(dosmem); /* DOS memory highest address (including HMA) */ #define DOSMEM_SIZE 0x110000 #define DOSMEM_64KB 0x10000 /* see dlls/kernel/dosmem.c for the details */ static char *DOSMEM_dosmem; static char *DOSMEM_sysmem; /* 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 inline dosmem_entry* next_block(dosmem_entry* block) { return (dosmem_entry*)((char*)block + sizeof(dosmem_entry) + (block->size & DM_BLOCK_MASK)); } #define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */ #define VM_STUB_SEGMENT 0xf000 /* BIOS segment */ /* FIXME: this should be moved to the LOL, and the whole allocation strategy * should use real MCB */ static dosmem_info* DOSMEM_info_block; /*********************************************************************** * DOSMEM_MemoryTop * * Gets the DOS memory top. */ static char *DOSMEM_MemoryTop(void) { return DOSMEM_dosmem+0x9FFFC; /* 640K */ } /*********************************************************************** * DOSMEM_RootBlock * * Gets the DOS memory root block. */ static dosmem_entry *DOSMEM_RootBlock(void) { /* first block has to be paragraph-aligned */ return (dosmem_entry*)(((char*)DOSMEM_info_block) + ((((sizeof(dosmem_info) + 0xf) & ~0xf) - sizeof(dosmem_entry)))); } /*********************************************************************** * DOSMEM_FillIsrTable * * Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000). * * NOTES: * Linux normally only traps INTs performed from or destined to BIOSSEG * for us to handle, if the int_revectored table is empty. Filling the * interrupt table with calls to INT stubs in BIOSSEG allows DOS programs * to hook interrupts, as well as use their familiar retf tricks to call * them, AND let Wine handle any unhooked interrupts transparently. */ static void DOSMEM_FillIsrTable(void) { SEGPTR *isr = (SEGPTR*)DOSMEM_sysmem; int x; for (x=0; x<256; x++) isr[x]=MAKESEGPTR(VM_STUB_SEGMENT,x*4); } static void DOSMEM_MakeIsrStubs(void) { DWORD *stub = (DWORD*)(DOSMEM_dosmem + (VM_STUB_SEGMENT << 4)); int x; for (x=0; x<256; x++) stub[x]=VM_STUB(x); } BIOSDATA* DOSVM_BiosData(void) { return (BIOSDATA *)(DOSMEM_sysmem + 0x400); } /********************************************************************** * DOSMEM_GetTicksSinceMidnight * * Return number of clock ticks since midnight. */ static DWORD DOSMEM_GetTicksSinceMidnight(void) { SYSTEMTIME time; /* This should give us the (approximately) correct * 18.206 clock ticks per second since midnight. */ GetLocalTime( &time ); return (((time.wHour * 3600 + time.wMinute * 60 + time.wSecond) * 18206) / 1000) + (time.wMilliseconds * 1000 / 54927); } /*********************************************************************** * DOSMEM_FillBiosSegments * * Fill the BIOS data segment with dummy values. */ static void DOSMEM_FillBiosSegments(void) { char *pBiosSys = DOSMEM_dosmem + 0xf0000; BYTE *pBiosROMTable = pBiosSys+0xe6f5; BIOSDATA *pBiosData = DOSVM_BiosData(); /* Clear all unused values */ memset( pBiosData, 0, sizeof(*pBiosData) ); /* FIXME: should check the number of configured drives and ports */ pBiosData->Com1Addr = 0x3f8; pBiosData->Com2Addr = 0x2f8; pBiosData->Lpt1Addr = 0x378; pBiosData->Lpt2Addr = 0x278; pBiosData->InstalledHardware = 0x5463; pBiosData->MemSize = 640; pBiosData->NextKbdCharPtr = 0x1e; pBiosData->FirstKbdCharPtr = 0x1e; pBiosData->VideoMode = 3; pBiosData->VideoColumns = 80; pBiosData->VideoPageSize = 80 * 25 * 2; pBiosData->VideoPageStartAddr = 0xb800; pBiosData->VideoCtrlAddr = 0x3d4; pBiosData->Ticks = DOSMEM_GetTicksSinceMidnight(); pBiosData->NbHardDisks = 2; pBiosData->KbdBufferStart = 0x1e; pBiosData->KbdBufferEnd = 0x3e; pBiosData->RowsOnScreenMinus1 = 24; pBiosData->BytesPerChar = 0x10; pBiosData->ModeOptions = 0x64; pBiosData->FeatureBitsSwitches = 0xf9; pBiosData->VGASettings = 0x51; pBiosData->DisplayCombination = 0x08; pBiosData->DiskDataRate = 0; /* fill ROM configuration table (values from Award) */ *(pBiosROMTable+0x0) = 0x08; /* number of bytes following LO */ *(pBiosROMTable+0x1) = 0x00; /* number of bytes following HI */ *(pBiosROMTable+0x2) = 0xfc; /* model */ *(pBiosROMTable+0x3) = 0x01; /* submodel */ *(pBiosROMTable+0x4) = 0x00; /* BIOS revision */ *(pBiosROMTable+0x5) = 0x74; /* feature byte 1 */ *(pBiosROMTable+0x6) = 0x00; /* feature byte 2 */ *(pBiosROMTable+0x7) = 0x00; /* feature byte 3 */ *(pBiosROMTable+0x8) = 0x00; /* feature byte 4 */ *(pBiosROMTable+0x9) = 0x00; /* feature byte 5 */ /* BIOS date string */ strcpy(pBiosSys+0xfff5, "13/01/99"); /* BIOS ID */ *(pBiosSys+0xfffe) = 0xfc; /* Reboot vector (f000:fff0 or ffff:0000) */ *(DWORD*)(pBiosSys + 0xfff0) = VM_STUB(0x19); } /*********************************************************************** * BiosTick * * Increment the BIOS tick counter. Called by timer signal handler. */ void BiosTick( WORD timer ) { BIOSDATA *pBiosData = DOSVM_BiosData(); if (pBiosData) pBiosData->Ticks++; } /*********************************************************************** * DOSMEM_AllocBlock * * Carve a chunk of the DOS memory block (without selector). */ LPVOID DOSMEM_AllocBlock(UINT size, UINT16* pseg) { UINT blocksize; char *block = NULL; dosmem_info *info_block = DOSMEM_info_block; dosmem_entry *dm; #ifdef __DOSMEM_DEBUG_ dosmem_entry *prev = NULL; #endif if( size > info_block->free ) return NULL; dm = DOSMEM_RootBlock(); while (dm && dm->size != DM_BLOCK_TERMINAL) { #ifdef __DOSMEM_DEBUG__ if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG ) { WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)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 */ BOOL DOSMEM_FreeBlock(void* ptr) { dosmem_info *info_block = DOSMEM_info_block; if( ptr >= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry)) && ptr < (void*)DOSMEM_MemoryTop() && !((((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_ResizeBlock * * Resize DOS memory block in place. Returns block size or -1 on error. * * If exact is TRUE, returned value is either old or requested block * size. If exact is FALSE, block is expanded even if there is not * enough space for full requested block size. */ UINT DOSMEM_ResizeBlock(void *ptr, UINT size, BOOL exact) { char *block = NULL; dosmem_info *info_block = DOSMEM_info_block; dosmem_entry *dm; dosmem_entry *next; UINT blocksize; UINT orgsize; if( (ptr < (void*)(sizeof(dosmem_entry) + (char*)DOSMEM_RootBlock())) || (ptr >= (void*)DOSMEM_MemoryTop()) || (((((char*)ptr) - DOSMEM_dosmem) & 0xf) != 0) ) return (UINT)-1; dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry)); if( dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL) ) return (UINT)-1; next = next_block(dm); orgsize = dm->size & DM_BLOCK_MASK; /* collapse free blocks */ while ( next->size & DM_BLOCK_FREE ) { 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 collapse didn't help we either expand block to maximum * available size (exact == FALSE) or give collapsed blocks * back to free storage (exact == TRUE). */ if (blocksize < size) size = exact ? orgsize : blocksize; block = ((char*)dm) + sizeof(dosmem_entry); if( blocksize - size > 0x20 ) { /* * split dm so that the next one stays * paragraph-aligned (and next gains 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; } else { dm->size &= DM_BLOCK_MASK; } /* * Adjust available memory if block size changes. */ info_block->free += orgsize - dm->size; return size; } /*********************************************************************** * DOSMEM_Available */ UINT DOSMEM_Available(void) { UINT blocksize, available = 0; dosmem_entry *dm; dm = DOSMEM_RootBlock(); while (dm && dm->size != DM_BLOCK_TERMINAL) { #ifdef __DOSMEM_DEBUG__ if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG ) { WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT)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 > available ) available = blocksize; dm = next; } else dm = next_block(dm); } return available; } /*********************************************************************** * DOSMEM_InitMemory * * Initialises the DOS memory structures. */ static void DOSMEM_InitMemory(char* addr) { dosmem_entry* root_block; dosmem_entry* dm; DOSMEM_FillBiosSegments(); DOSMEM_FillIsrTable(); DOSMEM_info_block = (dosmem_info*)addr; root_block = DOSMEM_RootBlock(); root_block->size = DOSMEM_MemoryTop() - (((char*)root_block) + sizeof(dosmem_entry)); DOSMEM_info_block->blocks = 0; DOSMEM_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 ; TRACE("DOS conventional memory initialized, %d bytes free.\n", DOSMEM_Available()); } /****************************************************************** * DOSMEM_InitDosMemory * * When WineDOS is loaded, initializes the current DOS memory layout. */ BOOL DOSMEM_InitDosMemory(void) { HMODULE16 hModule; unsigned short sel; LDT_ENTRY entry; DWORD reserve; if (!(hModule = GetModuleHandle16("KERNEL"))) return FALSE; /* KERNEL.194: __F000H */ sel = LOWORD(GetProcAddress16(hModule, (LPCSTR)(ULONG_PTR)194)); wine_ldt_get_entry(sel, &entry); DOSMEM_dosmem = (char*)wine_ldt_get_base(&entry) - 0xF0000; /* KERNEL.183: __0000H */ sel = LOWORD(GetProcAddress16(hModule, (LPCSTR)(DWORD_PTR)183)); wine_ldt_get_entry(sel, &entry); DOSMEM_sysmem = wine_ldt_get_base(&entry); /* * Reserve either: * - lowest 64k for NULL pointer catching (Win16) * - lowest 1k for interrupt handlers and * another 0.5k for BIOS, DOS and intra-application * areas (DOS) */ if (DOSMEM_dosmem != DOSMEM_sysmem) reserve = 0x10000; /* 64k */ else reserve = 0x600; /* 1.5k */ /* * Round to paragraph boundary in order to make * sure the alignment is correct. */ reserve = ((reserve + 15) >> 4) << 4; /* * Set DOS memory base and initialize conventional memory. */ DOSMEM_InitMemory(DOSMEM_dosmem + reserve); return TRUE; } /****************************************************************** * DOSMEM_MapDosLayout * * Initialize the first MB of memory to look like a real DOS setup */ BOOL DOSMEM_MapDosLayout(void) { static int already_mapped; if (!already_mapped) { HMODULE16 hModule; unsigned short sel; LDT_ENTRY entry; if (DOSMEM_dosmem) { ERR( "Needs access to the first megabyte for DOS mode\n" ); ExitProcess(1); } MESSAGE( "Warning: unprotecting memory to allow real-mode calls.\n" " NULL pointer accesses will no longer be caught.\n" ); VirtualProtect( NULL, DOSMEM_SIZE, PAGE_EXECUTE_READWRITE, NULL ); /* copy the BIOS and ISR area down */ memcpy( DOSMEM_dosmem, DOSMEM_sysmem, 0x400 + 0x100 ); DOSMEM_sysmem = DOSMEM_dosmem; hModule = GetModuleHandle16("KERNEL"); /* selector to 0000H */ sel = LOWORD(GetProcAddress16(hModule, (LPCSTR)(DWORD_PTR)183)); wine_ldt_get_entry(sel, &entry); wine_ldt_set_base(&entry, NULL); wine_ldt_set_entry(sel, &entry); /* selector to BiosData */ sel = LOWORD(GetProcAddress16(hModule, (LPCSTR)(DWORD_PTR)193)); wine_ldt_get_entry(sel, &entry); wine_ldt_set_base(&entry, (const void*)0x400); wine_ldt_set_entry(sel, &entry); /* we may now need the actual interrupt stubs, and since we've just moved the * interrupt vector table away, we can fill the area with stubs instead... */ DOSMEM_MakeIsrStubs(); already_mapped = 1; } return TRUE; }