| /* |
| * 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 <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; |
| |
| /* 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. |
| */ |
| void DOSMEM_InitDosMemory(void) |
| { |
| HMODULE16 hModule; |
| unsigned short sel; |
| LDT_ENTRY entry; |
| DWORD reserve; |
| |
| hModule = GetModuleHandle16("KERNEL"); |
| /* 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); |
| } |
| |
| /****************************************************************** |
| * 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; |
| } |
