843 lines
25 KiB
C
843 lines
25 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 "wine/port.h"
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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 <sys/types.h>
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#ifdef HAVE_SYS_MMAN_H
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# include <sys/mman.h>
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#endif
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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 "selectors.h"
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#include "miscemu.h"
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#include "vga.h"
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#include "dosexe.h"
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#include "debugtools.h"
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DEFAULT_DEBUG_CHANNEL(dosmem);
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DECLARE_DEBUG_CHANNEL(selector);
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WORD DOSMEM_0000H; /* segment at 0:0 */
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WORD DOSMEM_BiosDataSeg; /* BIOS data segment at 0x40:0 */
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WORD DOSMEM_BiosSysSeg; /* BIOS ROM segment at 0xf000:0 */
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DWORD DOSMEM_CollateTable;
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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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/* DOS memory base */
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static char *DOSMEM_dosmem;
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/* DOS system base (for interrupt vector table and BIOS data area)
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* ...should in theory (i.e. Windows) be equal to DOSMEM_dosmem (NULL),
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* but is normally set to 0xf0000 in Wine to allow trapping of NULL pointers,
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* and only relocated to NULL when absolutely necessary */
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static char *DOSMEM_sysmem;
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/* various real-mode code stubs */
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WORD DOSMEM_wrap_seg;
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WORD DOSMEM_xms_seg;
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WORD DOSMEM_dpmi_seg;
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WORD DOSMEM_dpmi_sel;
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/***********************************************************************
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* DOSMEM_SystemBase
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*
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* Gets the virtual DOS memory base (interrupt table).
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*/
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char *DOSMEM_SystemBase(void)
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{
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return DOSMEM_sysmem;
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}
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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(void)
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{
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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(void)
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{
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return DOSMEM_dosmem+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(void)
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{
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return (dosmem_info*)(DOSMEM_dosmem+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(void)
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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()) +
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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(void)
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{
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SEGPTR *isr = (SEGPTR*)DOSMEM_sysmem;
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int x;
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for (x=0; x<256; x++) isr[x]=MAKESEGPTR(VM_STUB_SEGMENT,x*4);
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}
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static void DOSMEM_MakeIsrStubs(void)
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{
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DWORD *stub = (DWORD*)(DOSMEM_dosmem + (VM_STUB_SEGMENT << 4));
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int x;
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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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LPSTR ptr;
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static const 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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static const char enter_xms[]=
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{
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/* XMS hookable entry point */
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0xEB,0x03, /* jmp entry */
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0x90,0x90,0x90, /* nop;nop;nop */
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/* entry: */
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/* real entry point */
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/* for simplicity, we'll just use the same hook as DPMI below */
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0xCD,0x31, /* int $0x31 */
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0xCB /* lret */
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};
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static const char enter_pm[]=
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{
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0x50, /* pushw %ax */
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0x52, /* pushw %dx */
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0x55, /* pushw %bp */
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0x89,0xE5, /* movw %sp,%bp */
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/* get return CS */
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0x8B,0x56,0x08, /* movw 8(%bp),%dx */
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/* just call int 31 here to get into protected mode... */
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/* it'll check whether it was called from dpmi_seg... */
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0xCD,0x31, /* int $0x31 */
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/* we are now in the context of a 16-bit relay call */
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/* need to fixup our stack;
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* 16-bit relay return address will be lost, but we won't worry quite yet */
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0x8E,0xD0, /* movw %ax,%ss */
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0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
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/* set return CS */
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0x89,0x56,0x08, /* movw %dx,8(%bp) */
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0x5D, /* popw %bp */
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0x5A, /* popw %dx */
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0x58, /* popw %ax */
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0xCB /* lret */
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};
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ptr = DOSMEM_GetBlock( sizeof(wrap_code), &DOSMEM_wrap_seg );
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memcpy( ptr, wrap_code, sizeof(wrap_code) );
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ptr = DOSMEM_GetBlock( sizeof(enter_xms), &DOSMEM_xms_seg );
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memcpy( ptr, enter_xms, sizeof(enter_xms) );
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ptr = DOSMEM_GetBlock( sizeof(enter_pm), &DOSMEM_dpmi_seg );
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memcpy( ptr, enter_pm, sizeof(enter_pm) );
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DOSMEM_dpmi_sel = SELECTOR_AllocBlock( ptr, sizeof(enter_pm), WINE_LDT_FLAGS_CODE );
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}
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BIOSDATA * DOSMEM_BiosData()
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{
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return (BIOSDATA *)(DOSMEM_sysmem + 0x400);
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}
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BYTE * DOSMEM_BiosSys()
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{
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return DOSMEM_dosmem+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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(MAKESEGPTR(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 = DOSMEM_BiosSys();
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BYTE *pBiosROMTable = pBiosSys+0xe6f5;
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BIOSDATA *pBiosData = DOSMEM_BiosData();
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/* bogus 0xe0xx addresses !! Adapt int 0x10/0x1b if change needed */
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VIDEOFUNCTIONALITY *pVidFunc = (VIDEOFUNCTIONALITY *)(pBiosSys+0xe000);
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VIDEOSTATE *pVidState = (VIDEOSTATE *)(pBiosSys+0xe010);
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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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memset( pVidFunc, 0, sizeof(*pVidFunc ) );
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memset( pVidState, 0, sizeof(*pVidState) );
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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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*(pBiosROMTable+0x0) = 0x08; /* number of bytes following LO */
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*(pBiosROMTable+0x1) = 0x00; /* number of bytes following HI */
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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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for (i = 0; i < 7; i++)
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pVidFunc->ModeSupport[i] = 0xff;
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pVidFunc->ScanlineSupport = 7;
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pVidFunc->NumberCharBlocks = 0;
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pVidFunc->ActiveCharBlocks = 0;
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pVidFunc->MiscFlags = 0x8ff;
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pVidFunc->SavePointerFlags = 0x3f;
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pVidState->StaticFuncTable = 0xf000e000; /* FIXME: always real mode ? */
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pVidState->VideoMode = pBiosData->VideoMode; /* needs updates! */
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pVidState->NumberColumns = pBiosData->VideoColumns; /* needs updates! */
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pVidState->RegenBufLen = 0;
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pVidState->RegenBufAddr = 0;
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for (i = 0; i < 8; i++)
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pVidState->CursorPos[i] = 0;
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pVidState->CursorType = 0x0a0b; /* start/end line */
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pVidState->ActivePage = 0;
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pVidState->CRTCPort = 0x3da;
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pVidState->Port3x8 = 0;
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pVidState->Port3x9 = 0;
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pVidState->NumberRows = 23; /* number of rows - 1 */
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pVidState->BytesPerChar = 0x10;
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pVidState->DCCActive = pBiosData->DisplayCombination;
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pVidState->DCCAlternate = 0;
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pVidState->NumberColors = 16;
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pVidState->NumberPages = 1;
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pVidState->NumberScanlines = 3; /* (0,1,2,3) = (200,350,400,480) */
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pVidState->CharBlockPrimary = 0;
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pVidState->CharBlockSecondary = 0;
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pVidState->MiscFlags =
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(pBiosData->VGASettings & 0x0f)
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| ((pBiosData->ModeOptions & 1) << 4); /* cursor emulation */
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pVidState->NonVGASupport = 0;
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pVidState->VideoMem = (pBiosData->ModeOptions & 0x60 >> 5);
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pVidState->SavePointerState = 0;
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pVidState->DisplayStatus = 4;
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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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#if 0 /* no longer used */
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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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#endif
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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(void)
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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();
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dosmem_entry* root_block = DOSMEM_RootBlock();
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dosmem_entry* dm;
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root_block->size = DOSMEM_MemoryTop() - (((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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* setup_dos_mem
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*
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* Setup the first megabyte for DOS memory access
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*/
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static void setup_dos_mem( int dos_init )
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{
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int sys_offset = 0;
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int page_size = getpagesize();
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void *addr = wine_anon_mmap( (void *)page_size, 0x110000-page_size,
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PROT_READ | PROT_WRITE | PROT_EXEC, 0 );
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if (addr == (void *)page_size) /* we got what we wanted */
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{
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/* now map from address 0 */
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addr = wine_anon_mmap( NULL, 0x110000, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED );
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if (addr)
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{
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ERR("MAP_FIXED failed at address 0 for DOS address space\n" );
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ExitProcess(1);
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}
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/* inform the memory manager that there is a mapping here */
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VirtualAlloc( addr, 0x110000, MEM_RESERVE | MEM_SYSTEM, PAGE_EXECUTE_READWRITE );
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/* protect the first 64K to catch NULL pointers */
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if (!dos_init)
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{
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VirtualProtect( addr, 0x10000, PAGE_NOACCESS, NULL );
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/* move the BIOS and ISR area from 0x00000 to 0xf0000 */
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sys_offset += 0xf0000;
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}
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}
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else
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{
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ERR("Cannot use first megabyte for DOS address space, please report\n" );
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if (dos_init) ExitProcess(1);
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/* allocate the DOS area somewhere else */
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addr = VirtualAlloc( NULL, 0x110000, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
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if (!addr)
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{
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ERR( "Cannot allocate DOS memory\n" );
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ExitProcess(1);
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}
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}
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DOSMEM_dosmem = addr;
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DOSMEM_sysmem = (char*)addr + sys_offset;
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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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*/
|
|
BOOL DOSMEM_Init(BOOL dos_init)
|
|
{
|
|
static int already_done, already_mapped;
|
|
|
|
if (!already_done)
|
|
{
|
|
setup_dos_mem( dos_init );
|
|
|
|
DOSMEM_0000H = GLOBAL_CreateBlock( GMEM_FIXED, DOSMEM_sysmem,
|
|
0x10000, 0, WINE_LDT_FLAGS_DATA );
|
|
DOSMEM_BiosDataSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_sysmem + 0x400,
|
|
0x100, 0, WINE_LDT_FLAGS_DATA );
|
|
DOSMEM_BiosSysSeg = GLOBAL_CreateBlock(GMEM_FIXED,DOSMEM_dosmem+0xf0000,
|
|
0x10000, 0, WINE_LDT_FLAGS_DATA );
|
|
DOSMEM_FillBiosSegments();
|
|
DOSMEM_FillIsrTable();
|
|
DOSMEM_InitMemory();
|
|
DOSMEM_InitCollateTable();
|
|
DOSMEM_InitErrorTable();
|
|
DOSMEM_InitDPMI();
|
|
DOSDEV_InstallDOSDevices();
|
|
already_done = 1;
|
|
}
|
|
else if (dos_init && !already_mapped)
|
|
{
|
|
if (DOSMEM_dosmem)
|
|
{
|
|
ERR( "Needs access to the first megabyte for DOS mode\n" );
|
|
ExitProcess(1);
|
|
}
|
|
MESSAGE( "Warning: unprotecting the first 64KB of memory to allow real-mode calls.\n"
|
|
" NULL pointer accesses will no longer be caught.\n" );
|
|
VirtualProtect( NULL, 0x10000, PAGE_EXECUTE_READWRITE, NULL );
|
|
/* copy the BIOS and ISR area down */
|
|
memcpy( DOSMEM_dosmem, DOSMEM_sysmem, 0x400 + 0x100 );
|
|
DOSMEM_sysmem = DOSMEM_dosmem;
|
|
SetSelectorBase( DOSMEM_0000H, 0 );
|
|
SetSelectorBase( DOSMEM_BiosDataSeg, 0x400 );
|
|
/* 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;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_Tick
|
|
*
|
|
* Increment the BIOS tick counter. Called by timer signal handler.
|
|
*/
|
|
void DOSMEM_Tick( WORD timer )
|
|
{
|
|
BIOSDATA *pBiosData = DOSMEM_BiosData();
|
|
if (pBiosData) pBiosData->Ticks++;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSMEM_GetBlock
|
|
*
|
|
* Carve a chunk of the DOS memory block (without selector).
|
|
*/
|
|
LPVOID DOSMEM_GetBlock(UINT size, UINT16* pseg)
|
|
{
|
|
UINT blocksize;
|
|
char *block = NULL;
|
|
dosmem_info *info_block = DOSMEM_InfoBlock();
|
|
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_InfoBlock();
|
|
|
|
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
|
|
*/
|
|
LPVOID DOSMEM_ResizeBlock(void* ptr, UINT size, UINT16* pseg)
|
|
{
|
|
char *block = NULL;
|
|
dosmem_info *info_block = DOSMEM_InfoBlock();
|
|
|
|
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( pseg ) *pseg = ((char*)ptr - DOSMEM_dosmem) >> 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(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(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_MapLinearToDos
|
|
*
|
|
* Linear address to the DOS address space.
|
|
*/
|
|
UINT DOSMEM_MapLinearToDos(LPVOID ptr)
|
|
{
|
|
if (((char*)ptr >= DOSMEM_dosmem) &&
|
|
((char*)ptr < DOSMEM_dosmem + 0x100000))
|
|
return (UINT)ptr - (UINT)DOSMEM_dosmem;
|
|
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_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, WINE_LDT_FLAGS_DATA );
|
|
TRACE_(selector)("(0x%04x) returns 0x%04x.\n", realsel,sel);
|
|
return sel;
|
|
}
|
|
|