/* * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ #include "config.h" #include "wine/port.h" #include <signal.h> #include <stdarg.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #ifdef HAVE_SYS_MMAN_H # include <sys/mman.h> #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; /* * Memory Control Block (MCB) definition * FIXME: implement Allocation Strategy */ #define MCB_DUMP(mc) \ TRACE ("MCB_DUMP base=%p type=%02xh psp=%04xh size=%04xh\n", mc, mc->type, mc->psp , mc->size ) #define MCB_NEXT(mc) \ (MCB*) ((mc->type==MCB_TYPE_LAST) ? NULL : (char*)(mc) + ((mc->size + 1) << 4) ) /* FIXME: should we check more? */ #define MCB_VALID(mc) \ ((mc->type==MCB_TYPE_NORMAL) || (mc->type==MCB_TYPE_LAST)) #define MCB_TYPE_NORMAL 0x4d #define MCB_TYPE_LAST 0x5a #define MCB_PSP_DOS 0x0060 #define MCB_PSP_FREE 0 #include "pshpack1.h" typedef struct { BYTE type; WORD psp; /* segment of owner psp */ WORD size; /* in paragraphs */ BYTE pad[3]; BYTE name[8]; } MCB; #include "poppack.h" /* #define __DOSMEM_DEBUG__ */ #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 */ static MCB* DOSMEM_root_block; /*********************************************************************** * DOSMEM_MemoryTop * * Gets the DOS memory top. */ static char *DOSMEM_MemoryTop(void) { return DOSMEM_dosmem+0x9FFFC; /* 640K */ } /*********************************************************************** * 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) { BYTE *pBiosSys = (BYTE*)DOSMEM_dosmem + 0xf0000; BYTE *pBiosROMTable = pBiosSys+0xe6f5; BIOSDATA *pBiosData = DOSVM_BiosData(); static const char bios_date[] = "13/01/99"; /* 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 */ memcpy(pBiosSys+0xfff5, bios_date, sizeof bios_date); /* 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_Collapse * * Helper function for internal use only. * Atach all following free blocks to this one, even if this one is not free. */ void DOSMEM_Collapse( MCB* mcb ) { MCB* next = MCB_NEXT( mcb ); while (next && next->psp == MCB_PSP_FREE) { mcb->size = mcb->size + next->size + 1; mcb->type = next->type; /* make sure keeping MCB_TYPE_LAST */ next = MCB_NEXT( next ); } } /*********************************************************************** * DOSMEM_AllocBlock * * Carve a chunk of the DOS memory block (without selector). */ LPVOID DOSMEM_AllocBlock(UINT size, UINT16* pseg) { MCB *curr = DOSMEM_root_block; MCB *next = NULL; WORD psp = DOSVM_psp; if (!psp) psp = MCB_PSP_DOS; *pseg = 0; TRACE( "(%04xh)\n", size ); /* round up to paragraph */ size = (size + 15) >> 4; #ifdef __DOSMEM_DEBUG__ DOSMEM_Available(); /* checks the whole MCB list */ #endif /* loop over all MCB and search the next large enough MCB */ while (curr) { if (!MCB_VALID (curr)) { ERR( "MCB List Corrupt\n" ); MCB_DUMP( curr ); return NULL; } if (curr->psp == MCB_PSP_FREE) { DOSMEM_Collapse( curr ); /* is it large enough (one paragaph for the MCB)? */ if (curr->size >= size) { if (curr->size > size) { /* split curr */ next = (MCB *) ((char*) curr + ((size+1) << 4)); next->psp = MCB_PSP_FREE; next->size = curr->size - (size+1); next->type = curr->type; curr->type = MCB_TYPE_NORMAL; curr->size = size; } /* curr is the found block */ curr->psp = psp; if( pseg ) *pseg = (((char*)curr) + 16 - (char*)DOSMEM_dosmem) >> 4; return (LPVOID) ((char*)curr + 16); } } curr = MCB_NEXT(curr); } return NULL; } /*********************************************************************** * DOSMEM_FreeBlock */ BOOL DOSMEM_FreeBlock(void* ptr) { MCB* mcb = (MCB*) ((char*)ptr - 16); TRACE( "(%p)\n", ptr ); #ifdef __DOSMEM_DEBUG__ DOSMEM_Available(); #endif if (!MCB_VALID (mcb)) { ERR( "MCB invalid\n" ); MCB_DUMP( mcb ); return FALSE; } mcb->psp = MCB_PSP_FREE; DOSMEM_Collapse( mcb ); return TRUE; } /*********************************************************************** * 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. * * TODO: return also biggest block size */ UINT DOSMEM_ResizeBlock(void *ptr, UINT size, BOOL exact) { MCB* mcb = (MCB*) ((char*)ptr - 16); MCB* next; TRACE( "(%p,%04xh,%s)\n", ptr, size, exact ? "TRUE" : "FALSE" ); /* round up to paragraph */ size = (size + 15) >> 4; #ifdef __DOSMEM_DEBUG__ DOSMEM_Available(); #endif if (!MCB_VALID (mcb)) { ERR( "MCB invalid\n" ); MCB_DUMP( mcb ); return -1; } /* resize needed? */ if (mcb->size == size) return size; /* collapse free blocks */ DOSMEM_Collapse( mcb ); /* shrink mcb ? */ if (mcb->size > size) { next = (MCB *) ((char*)mcb + ((size+1) << 4)); next->type = mcb->type; next->psp = MCB_PSP_FREE; next->size = mcb->size - (size+1); mcb->type = MCB_TYPE_NORMAL; mcb->size = size; return size << 4; } if (!exact) { return mcb->size << 4; } return -1; } /*********************************************************************** * DOSMEM_Available */ UINT DOSMEM_Available(void) { UINT available = 0; UINT total = 0; MCB *curr = DOSMEM_root_block; /* loop over all MCB and search the largest free MCB */ while (curr) { #ifdef __DOSMEM_DEBUG__ MCB_DUMP( curr ); #endif if (!MCB_VALID (curr)) { ERR( "MCB List Corrupt\n" ); MCB_DUMP( curr ); return 0; } if (curr->psp == MCB_PSP_FREE && curr->size > available ) available = curr->size; total += curr->size + 1; curr = MCB_NEXT( curr ); } TRACE( " %04xh of %04xh paragraphs available\n", available, total ); return available << 4; } /*********************************************************************** * DOSMEM_InitMemory * * Initialises the DOS memory structures. */ static void DOSMEM_InitMemory(char* addr) { DOSMEM_FillBiosSegments(); DOSMEM_FillIsrTable(); /* align root block to paragraph */ DOSMEM_root_block = (MCB*) (( (DWORD_PTR)(addr+0xf) >> 4) << 4); DOSMEM_root_block->type = MCB_TYPE_LAST; DOSMEM_root_block->psp = MCB_PSP_FREE; DOSMEM_root_block->size = (DOSMEM_MemoryTop() - ((char*)DOSMEM_root_block)) >> 4; 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; }