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59c827325c
on the correct address space. Added DOSMEM_MovePointers() that relocates selectors when the DOS address space changes (i.e. when dosmod is spawned, particularly from Win16 apps that uses DPMI to execute real-mode code). More complete DOS device implementation.
760 lines
23 KiB
C
760 lines
23 KiB
C
/*
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* DOS memory emulation
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*
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* Copyright 1995 Alexandre Julliard
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* Copyright 1996 Marcus Meissner
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*/
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include "winbase.h"
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#include "wine/winbase16.h"
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#include "global.h"
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#include "ldt.h"
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#include "miscemu.h"
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#include "vga.h"
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#include "module.h"
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#include "task.h"
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#include "debugtools.h"
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DECLARE_DEBUG_CHANNEL(dosmem)
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DECLARE_DEBUG_CHANNEL(selector)
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HANDLE16 DOSMEM_BiosDataSeg; /* BIOS data segment at 0x40:0 */
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HANDLE16 DOSMEM_BiosSysSeg; /* BIOS ROM segment at 0xf000:0 */
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static char *DOSMEM_dosmem;
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DWORD DOSMEM_CollateTable;
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DWORD DOSMEM_ErrorCall;
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DWORD DOSMEM_ErrorBuffer;
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/* use 2 low bits of 'size' for the housekeeping */
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#define DM_BLOCK_DEBUG 0xABE00000
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#define DM_BLOCK_TERMINAL 0x00000001
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#define DM_BLOCK_FREE 0x00000002
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#define DM_BLOCK_MASK 0x001FFFFC
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/*
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#define __DOSMEM_DEBUG__
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*/
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typedef struct {
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unsigned size;
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} dosmem_entry;
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typedef struct {
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unsigned blocks;
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unsigned free;
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} dosmem_info;
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#define NEXT_BLOCK(block) \
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(dosmem_entry*)(((char*)(block)) + \
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sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK))
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#define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
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#define VM_STUB_SEGMENT 0xf000 /* BIOS segment */
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/***********************************************************************
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* DOSMEM_MemoryBase
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*
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* Gets the DOS memory base.
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*/
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char *DOSMEM_MemoryBase(HMODULE16 hModule)
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{
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TDB *pTask = hModule ? NULL : (TDB *)GlobalLock16( GetCurrentTask() );
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NE_MODULE *pModule = (hModule || pTask) ? NE_GetPtr( hModule ? hModule : pTask->hModule ) : NULL;
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GlobalUnlock16( GetCurrentTask() );
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if (pModule && pModule->dos_image)
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return pModule->dos_image;
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else
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return DOSMEM_dosmem;
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}
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/***********************************************************************
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* DOSMEM_MemoryTop
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*
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* Gets the DOS memory top.
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*/
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static char *DOSMEM_MemoryTop(HMODULE16 hModule)
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{
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return DOSMEM_MemoryBase(hModule)+0x9FFFC; /* 640K */
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}
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/***********************************************************************
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* DOSMEM_InfoBlock
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*
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* Gets the DOS memory info block.
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*/
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static dosmem_info *DOSMEM_InfoBlock(HMODULE16 hModule)
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{
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return (dosmem_info*)(DOSMEM_MemoryBase(hModule)+0x10000); /* 64K */
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}
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/***********************************************************************
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* DOSMEM_RootBlock
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*
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* Gets the DOS memory root block.
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*/
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static dosmem_entry *DOSMEM_RootBlock(HMODULE16 hModule)
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{
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/* first block has to be paragraph-aligned */
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return (dosmem_entry*)(((char*)DOSMEM_InfoBlock(hModule)) +
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((((sizeof(dosmem_info) + 0xf) & ~0xf) - sizeof(dosmem_entry))));
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}
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/***********************************************************************
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* DOSMEM_FillIsrTable
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*
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* Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000).
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*
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* NOTES:
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* Linux normally only traps INTs performed from or destined to BIOSSEG
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* for us to handle, if the int_revectored table is empty. Filling the
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* interrupt table with calls to INT stubs in BIOSSEG allows DOS programs
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* to hook interrupts, as well as use their familiar retf tricks to call
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* them, AND let Wine handle any unhooked interrupts transparently.
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*/
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static void DOSMEM_FillIsrTable(HMODULE16 hModule)
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{
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SEGPTR *isr = (SEGPTR*)DOSMEM_MemoryBase(hModule);
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DWORD *stub = (DWORD*)((char*)isr + (VM_STUB_SEGMENT << 4));
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int x;
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for (x=0; x<256; x++) isr[x]=PTR_SEG_OFF_TO_SEGPTR(VM_STUB_SEGMENT,x*4);
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for (x=0; x<256; x++) stub[x]=VM_STUB(x);
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}
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/***********************************************************************
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* DOSMEM_InitDPMI
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*
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* Allocate the global DPMI RMCB wrapper.
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*/
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static void DOSMEM_InitDPMI(void)
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{
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extern UINT16 DPMI_wrap_seg;
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static char wrap_code[]={
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0xCD,0x31, /* int $0x31 */
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0xCB /* lret */
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};
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LPSTR wrapper = (LPSTR)DOSMEM_GetBlock(0, sizeof(wrap_code), &DPMI_wrap_seg);
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memcpy(wrapper, wrap_code, sizeof(wrap_code));
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}
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BIOSDATA * DOSMEM_BiosData()
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{
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return (BIOSDATA *)(DOSMEM_MemoryBase(0)+0x400);
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}
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BYTE * DOSMEM_BiosSys()
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{
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return DOSMEM_MemoryBase(0)+0xf0000;
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}
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struct _DOS_LISTOFLISTS * DOSMEM_LOL()
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{
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return (struct _DOS_LISTOFLISTS *)DOSMEM_MapRealToLinear
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(PTR_SEG_OFF_TO_SEGPTR(HIWORD(DOS_LOLSeg),0));
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}
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/***********************************************************************
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* DOSMEM_FillBiosSegments
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*
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* Fill the BIOS data segment with dummy values.
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*/
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static void DOSMEM_FillBiosSegments(void)
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{
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BYTE *pBiosSys = (BYTE *)GlobalLock16( DOSMEM_BiosSysSeg );
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BYTE *pBiosROMTable = pBiosSys+0xe6f5;
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BIOSDATA *pBiosData = (BIOSDATA *)GlobalLock16( DOSMEM_BiosDataSeg );
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/* bogus 0xe0xx addresses !! Adapt int 0x10/0x1b if change needed */
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BYTE *pVideoStaticFuncTable = pBiosSys+0xe000;
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BYTE *pVideoStateInfo = pBiosSys+0xe010;
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BYTE *p;
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int i;
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/* Clear all unused values */
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memset( pBiosData, 0, sizeof(*pBiosData) );
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/* FIXME: should check the number of configured drives and ports */
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pBiosData->Com1Addr = 0x3f8;
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pBiosData->Com2Addr = 0x2f8;
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pBiosData->Lpt1Addr = 0x378;
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pBiosData->Lpt2Addr = 0x278;
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pBiosData->InstalledHardware = 0x5463;
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pBiosData->MemSize = 640;
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pBiosData->NextKbdCharPtr = 0x1e;
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pBiosData->FirstKbdCharPtr = 0x1e;
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pBiosData->VideoMode = 3;
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pBiosData->VideoColumns = 80;
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pBiosData->VideoPageSize = 80 * 25 * 2;
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pBiosData->VideoPageStartAddr = 0xb800;
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pBiosData->VideoCtrlAddr = 0x3d4;
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pBiosData->Ticks = INT1A_GetTicksSinceMidnight();
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pBiosData->NbHardDisks = 2;
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pBiosData->KbdBufferStart = 0x1e;
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pBiosData->KbdBufferEnd = 0x3e;
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pBiosData->RowsOnScreenMinus1 = 23;
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pBiosData->BytesPerChar = 0x10;
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pBiosData->ModeOptions = 0x64;
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pBiosData->FeatureBitsSwitches = 0xf9;
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pBiosData->VGASettings = 0x51;
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pBiosData->DisplayCombination = 0x08;
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pBiosData->DiskDataRate = 0;
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/* fill ROM configuration table (values from Award) */
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*(WORD *)(pBiosROMTable)= 0x08; /* number of bytes following */
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*(pBiosROMTable+0x2) = 0xfc; /* model */
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*(pBiosROMTable+0x3) = 0x01; /* submodel */
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*(pBiosROMTable+0x4) = 0x00; /* BIOS revision */
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*(pBiosROMTable+0x5) = 0x74; /* feature byte 1 */
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*(pBiosROMTable+0x6) = 0x00; /* feature byte 2 */
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*(pBiosROMTable+0x7) = 0x00; /* feature byte 3 */
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*(pBiosROMTable+0x8) = 0x00; /* feature byte 4 */
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*(pBiosROMTable+0x9) = 0x00; /* feature byte 5 */
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p = pVideoStaticFuncTable;
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for (i=0; i < 7; i++)
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*(p+i) = 0xff; /* modes supported 1 to 7 */
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*(p+0x7) = 7; /* scan lines supported */
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*(p+0x8) = 0; /* tot nr of char blocks in text mode */
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*(p+0x9) = 0; /* max nr of active char blocks in text */
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*(WORD *)(p+0xa) = 0x8ff; /* misc support flags */
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*(WORD *)(p+0xc) = 0; /* reserved */
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*(p+0xe) = 0x3f; /* save pointer function flags */
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*(p+0xf) = 0; /* reserved */
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p = pVideoStateInfo;
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*(DWORD *)p = 0xf000e000; /* address of pVideoStaticFuncTable, FIXME: always real mode ? */
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*(p+0x04) = /* current video mode, needs updates ! */
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pBiosData->VideoMode;
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*(WORD *)(p+0x05) = /* number of columns, needs updates ! */
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pBiosData->VideoColumns;
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*(WORD *)(p+0x07) = 0; /* length of regen (???) buffer in bytes */
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*(WORD *)(p+0x09) = 0; /* starting address of regen (?) buffer */
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*(WORD *)(p+0x0b) = 0; /* cursorpos page 0 */
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*(WORD *)(p+0x0d) = 0; /* cursorpos page 1 */
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*(WORD *)(p+0x0f) = 0; /* page 2 */
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*(WORD *)(p+0x11) = 0; /* page 3 */
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*(WORD *)(p+0x13) = 0; /* page 4 */
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*(WORD *)(p+0x15) = 0; /* page 5 */
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*(WORD *)(p+0x17) = 0; /* page 6 */
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*(WORD *)(p+0x19) = 0; /* page 7 */
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*(WORD *)(p+0x1b) = 0x0a0b; /* cursor size (start/end line) */
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*(p+0x1d) = 0; /* active display page */
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*(WORD *)(p+0x1e) = 0x3da; /* CRTC port address */
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*(p+0x20) = 0x0; /* current setting of port 0x3x8 */
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*(p+0x21) = 0x0; /* current setting of port 0x3x9 */
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*(p+0x22) = 23; /* number of rows - 1 */
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*(WORD *)(p+0x23) = 0x10; /* bytes/character */
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*(p+0x25) = /* comb. of active display */
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pBiosData->DisplayCombination;
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*(p+0x26) = 0; /* DCC (???) of alternate display */
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*(WORD *)(p+0x27) = 16; /* number of colors in current mode */
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*(p+0x29) = 1; /* number of pages in current mode */
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*(p+0x2a) = 3; /* number of scan lines active */
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/* (0,1,2,3) = (200,350,400,480) */
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*(p+0x2b) = 0; /* primary character block (?) */
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*(p+0x2c) = 0; /* secondary character block (?) */
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*(p+0x2d) = /* miscellaneous flags */
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(pBiosData->VGASettings & 0x0f)
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| ((pBiosData->ModeOptions & 1) << 4); /* cursor emulation */
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*(p+0x2e) = 0; /* non-VGA mode support */
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*(WORD *)(p+0x2f) = 0; /* reserved */
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*(p+0x31) = /* video memory available */
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(pBiosData->ModeOptions & 0x60 >> 5);
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*(p+0x32) = 0; /* save pointer state flags */
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*(p+0x33) = 4; /* display info and status */
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/* BIOS date string */
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strcpy((char *)pBiosSys+0xfff5, "13/01/99");
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/* BIOS ID */
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*(pBiosSys+0xfffe) = 0xfc;
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}
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/***********************************************************************
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* DOSMEM_InitCollateTable
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*
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* Initialises the collate table (character sorting, language dependent)
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*/
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static void DOSMEM_InitCollateTable()
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{
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DWORD x;
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unsigned char *tbl;
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int i;
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x = GlobalDOSAlloc16(258);
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DOSMEM_CollateTable = MAKELONG(0,(x>>16));
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tbl = DOSMEM_MapRealToLinear(DOSMEM_CollateTable);
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*(WORD*)tbl = 0x100;
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tbl += 2;
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for ( i = 0; i < 0x100; i++) *tbl++ = i;
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}
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/***********************************************************************
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* DOSMEM_InitErrorTable
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*
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* Initialises the error tables (DOS 5+)
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*/
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static void DOSMEM_InitErrorTable()
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{
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DWORD x;
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char *call;
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/* We will use a snippet of real mode code that calls */
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/* a WINE-only interrupt to handle moving the requested */
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/* message into the buffer... */
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/* FIXME - There is still something wrong... */
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/* FIXME - Find hex values for opcodes...
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(On call, AX contains message number
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DI contains 'offset' (??)
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Resturn, ES:DI points to counted string )
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PUSH BX
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MOV BX, AX
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MOV AX, (arbitrary subfunction number)
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INT (WINE-only interrupt)
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POP BX
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RET
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*/
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const int code = 4;
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const int buffer = 80;
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const int SIZE_TO_ALLOCATE = code + buffer;
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/* FIXME - Complete rewrite of the table system to save */
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/* precious DOS space. Now, we return the 0001:???? as */
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/* DOS 4+ (??, it seems to be the case in MS 7.10) treats that */
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/* as a special case and programs will use the alternate */
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/* interface (a farcall returned with INT 24 (AX = 0x122e, DL = */
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/* 0x08) which lets us have a smaller memory footprint anyway. */
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x = GlobalDOSAlloc16(SIZE_TO_ALLOCATE);
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DOSMEM_ErrorCall = MAKELONG(0,(x>>16));
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DOSMEM_ErrorBuffer = DOSMEM_ErrorCall + code;
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call = DOSMEM_MapRealToLinear(DOSMEM_ErrorCall);
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memset(call, 0, SIZE_TO_ALLOCATE);
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/* Fixme - Copy assembly into buffer here */
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}
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/***********************************************************************
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* DOSMEM_InitMemory
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*
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* Initialises the DOS memory structures.
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*/
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static void DOSMEM_InitMemory(HMODULE16 hModule)
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{
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/* Low 64Kb are reserved for DOS/BIOS so the useable area starts at
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* 1000:0000 and ends at 9FFF:FFEF. */
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dosmem_info* info_block = DOSMEM_InfoBlock(hModule);
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dosmem_entry* root_block = DOSMEM_RootBlock(hModule);
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dosmem_entry* dm;
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root_block->size = DOSMEM_MemoryTop(hModule) - (((char*)root_block) + sizeof(dosmem_entry));
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info_block->blocks = 0;
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info_block->free = root_block->size;
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dm = NEXT_BLOCK(root_block);
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dm->size = DM_BLOCK_TERMINAL;
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root_block->size |= DM_BLOCK_FREE
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#ifdef __DOSMEM_DEBUG__
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| DM_BLOCK_DEBUG;
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#endif
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;
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}
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/***********************************************************************
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* DOSMEM_MovePointers
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*
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* Relocates any pointers into DOS memory to a new address space.
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*/
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static void DOSMEM_MovePointers(LPVOID dest, LPVOID src, DWORD size)
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{
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unsigned long delta = dest-src;
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unsigned cnt;
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ldt_entry ent;
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/* relocate base addresses of any selectors pointing into memory */
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for (cnt=FIRST_LDT_ENTRY_TO_ALLOC; cnt<LDT_SIZE; cnt++) {
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LDT_GetEntry(cnt, &ent);
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if ((ent.base >= (unsigned long)src) && \
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(ent.base < ((unsigned long)src + size))) {
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ent.base += delta;
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LDT_SetEntry(cnt, &ent);
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}
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}
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}
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/***********************************************************************
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* DOSMEM_Init
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*
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* Create the dos memory segments, and store them into the KERNEL
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* exported values.
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*/
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BOOL DOSMEM_Init(HMODULE16 hModule)
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{
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if (!hModule)
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{
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/* Allocate 1 MB dosmemory
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* - it is mostly wasted but we can use some of it to
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* store internal translation tables, etc...
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*/
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DOSMEM_dosmem = VirtualAlloc( NULL, 0x100000, MEM_COMMIT,
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PAGE_EXECUTE_READWRITE );
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if (!DOSMEM_dosmem)
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{
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WARN_(dosmem)("Could not allocate DOS memory.\n" );
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return FALSE;
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}
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DOSMEM_BiosDataSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0x400,
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0x100, 0, FALSE, FALSE, FALSE, NULL );
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DOSMEM_BiosSysSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0xf0000,
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0x10000, 0, FALSE, FALSE, FALSE, NULL );
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DOSMEM_FillIsrTable(0);
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DOSMEM_FillBiosSegments();
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DOSMEM_InitMemory(0);
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DOSMEM_InitCollateTable();
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DOSMEM_InitErrorTable();
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DOSMEM_InitDPMI();
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DOSDEV_InstallDOSDevices();
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}
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else
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{
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#if 0
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DOSMEM_FillIsrTable(hModule);
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DOSMEM_InitMemory(hModule);
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#else
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LPVOID base = DOSMEM_MemoryBase(hModule);
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/* bootstrap the new V86 task with a copy of the "system" memory */
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memcpy(base, DOSMEM_dosmem, 0x100000);
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/* then move existing selectors to it */
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DOSMEM_MovePointers(base, DOSMEM_dosmem, 0x100000);
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#endif
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}
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return TRUE;
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}
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/***********************************************************************
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* DOSMEM_Tick
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*
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* Increment the BIOS tick counter. Called by timer signal handler.
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*/
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void DOSMEM_Tick( WORD timer )
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{
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BIOSDATA *pBiosData = DOSMEM_BiosData();
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if (pBiosData) pBiosData->Ticks++;
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}
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/***********************************************************************
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* DOSMEM_GetBlock
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*
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* Carve a chunk of the DOS memory block (without selector).
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*/
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LPVOID DOSMEM_GetBlock(HMODULE16 hModule, UINT size, UINT16* pseg)
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{
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UINT blocksize;
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char *block = NULL;
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|
dosmem_info *info_block = DOSMEM_InfoBlock(hModule);
|
|
dosmem_entry *dm;
|
|
#ifdef __DOSMEM_DEBUG_
|
|
dosmem_entry *prev = NULL;
|
|
#endif
|
|
|
|
if( size > info_block->free ) return NULL;
|
|
dm = DOSMEM_RootBlock(hModule);
|
|
|
|
while (dm && dm->size != DM_BLOCK_TERMINAL)
|
|
{
|
|
#ifdef __DOSMEM_DEBUG__
|
|
if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
|
|
{
|
|
WARN_(dosmem)("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_MemoryBase(hModule)) >> 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(HMODULE16 hModule, void* ptr)
|
|
{
|
|
dosmem_info *info_block = DOSMEM_InfoBlock(hModule);
|
|
|
|
if( ptr >= (void*)(((char*)DOSMEM_RootBlock(hModule)) + sizeof(dosmem_entry)) &&
|
|
ptr < (void*)DOSMEM_MemoryTop(hModule) && !((((char*)ptr)
|
|
- DOSMEM_MemoryBase(hModule)) & 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
|
|
*/
|
|
LPVOID DOSMEM_ResizeBlock(HMODULE16 hModule, void* ptr, UINT size, UINT16* pseg)
|
|
{
|
|
char *block = NULL;
|
|
dosmem_info *info_block = DOSMEM_InfoBlock(hModule);
|
|
|
|
if( ptr >= (void*)(((char*)DOSMEM_RootBlock(hModule)) + sizeof(dosmem_entry)) &&
|
|
ptr < (void*)DOSMEM_MemoryTop(hModule) && !((((char*)ptr)
|
|
- DOSMEM_MemoryBase(hModule)) & 0xf) )
|
|
{
|
|
dosmem_entry *dm = (dosmem_entry*)(((char*)ptr) - sizeof(dosmem_entry));
|
|
|
|
if( pseg ) *pseg = ((char*)ptr - DOSMEM_MemoryBase(hModule)) >> 4;
|
|
|
|
if( !(dm->size & (DM_BLOCK_FREE | DM_BLOCK_TERMINAL))
|
|
)
|
|
{
|
|
dosmem_entry *next = NEXT_BLOCK(dm);
|
|
UINT blocksize, orgsize = dm->size & DM_BLOCK_MASK;
|
|
|
|
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 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;
|
|
|
|
info_block->free += orgsize - dm->size;
|
|
} else {
|
|
/* the collapse didn't help, try getting a new block */
|
|
block = DOSMEM_GetBlock(hModule, size, pseg);
|
|
if (block) {
|
|
/* we got one, copy the old data there (we do need to, right?) */
|
|
memcpy(block, ((char*)dm) + sizeof(dosmem_entry),
|
|
(size<orgsize) ? size : orgsize);
|
|
/* free old block */
|
|
info_block->blocks--;
|
|
info_block->free += dm->size;
|
|
|
|
dm->size |= DM_BLOCK_FREE;
|
|
} else {
|
|
/* and Bill Gates said 640K should be enough for everyone... */
|
|
|
|
/* need to split original and collapsed blocks apart again,
|
|
* and free the collapsed blocks again, before exiting */
|
|
if( blocksize - orgsize > 0x20 )
|
|
{
|
|
/* split dm so that the next one stays
|
|
* paragraph-aligned (and next gains free bit) */
|
|
|
|
dm->size = (((orgsize + 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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return (LPVOID)block;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_Available
|
|
*/
|
|
UINT DOSMEM_Available(HMODULE16 hModule)
|
|
{
|
|
UINT blocksize, available = 0;
|
|
dosmem_entry *dm;
|
|
|
|
dm = DOSMEM_RootBlock(hModule);
|
|
|
|
while (dm && dm->size != DM_BLOCK_TERMINAL)
|
|
{
|
|
#ifdef __DOSMEM_DEBUG__
|
|
if( (dm->size & DM_BLOCK_DEBUG) != DM_BLOCK_DEBUG )
|
|
{
|
|
WARN_(dosmem)("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_MapLinearToDos
|
|
*
|
|
* Linear address to the DOS address space.
|
|
*/
|
|
UINT DOSMEM_MapLinearToDos(LPVOID ptr)
|
|
{
|
|
if (((char*)ptr >= DOSMEM_MemoryBase(0)) &&
|
|
((char*)ptr < DOSMEM_MemoryBase(0) + 0x100000))
|
|
return (UINT)ptr - (UINT)DOSMEM_MemoryBase(0);
|
|
return (UINT)ptr;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_MapDosToLinear
|
|
*
|
|
* DOS linear address to the linear address space.
|
|
*/
|
|
LPVOID DOSMEM_MapDosToLinear(UINT ptr)
|
|
{
|
|
if (ptr < 0x100000) return (LPVOID)(ptr + (UINT)DOSMEM_MemoryBase(0));
|
|
return (LPVOID)ptr;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_MapRealToLinear
|
|
*
|
|
* Real mode DOS address into a linear pointer
|
|
*/
|
|
LPVOID DOSMEM_MapRealToLinear(DWORD x)
|
|
{
|
|
LPVOID lin;
|
|
|
|
lin=DOSMEM_MemoryBase(0)+(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;
|
|
}
|
|
|