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wine/msdos/dpmi.c
Alexandre Julliard 65ea73fedf Added DPMI segments structure and related function to avoid direct 
references to dosmem internal variables.
Determine BIOS system offsets at compile time.
2002-09-04 18:52:22 +00:00

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/*
* DPMI 0.9 emulation
*
* Copyright 1995 Alexandre Julliard
*
* 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"
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <string.h>
#include "windef.h"
#include "wine/winbase16.h"
#include "miscemu.h"
#include "msdos.h"
#include "task.h"
#include "toolhelp.h"
#include "selectors.h"
#include "callback.h"
#include "wine/debug.h"
#include "stackframe.h"
WINE_DEFAULT_DEBUG_CHANNEL(int31);
#define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
void CreateBPB(int drive, BYTE *data, BOOL16 limited); /* defined in int21.c */
static void* lastvalloced = NULL;
DOSVM_TABLE Dosvm = { NULL, };
static HMODULE DosModule;
/**********************************************************************
* DPMI_LoadDosSystem
*/
BOOL DPMI_LoadDosSystem(void)
{
if (DosModule) return TRUE;
DosModule = LoadLibraryA( "winedos.dll" );
if (!DosModule) {
ERR("could not load winedos.dll, DOS subsystem unavailable\n");
return FALSE;
}
#define GET_ADDR(func) Dosvm.func = (void *)GetProcAddress(DosModule, #func);
GET_ADDR(LoadDosExe);
GET_ADDR(CallRMInt);
GET_ADDR(CallRMProc);
GET_ADDR(AllocRMCB);
GET_ADDR(FreeRMCB);
GET_ADDR(RawModeSwitch);
GET_ADDR(SetTimer);
GET_ADDR(GetTimer);
GET_ADDR(inport);
GET_ADDR(outport);
GET_ADDR(ASPIHandler);
#undef GET_ADDR
return TRUE;
}
/**********************************************************************
* DPMI_xalloc
* special virtualalloc, allocates lineary monoton growing memory.
* (the usual VirtualAlloc does not satisfy that restriction)
*/
static LPVOID
DPMI_xalloc(int len) {
LPVOID ret;
LPVOID oldlastv = lastvalloced;
if (lastvalloced) {
int xflag = 0;
ret = NULL;
while (!ret) {
ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
if (!ret)
lastvalloced = (char *) lastvalloced + 0x10000;
/* we failed to allocate one in the first round.
* try non-linear
*/
if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
FIXME("failed to allocate lineary growing memory (%d bytes), using non-linear growing...\n",len);
xflag++;
}
/* if we even fail to allocate something in the next
* round, return NULL
*/
if ((xflag==1) && (lastvalloced >= oldlastv))
xflag++;
if ((xflag==2) && (lastvalloced < oldlastv)) {
FIXME("failed to allocate any memory of %d bytes!\n",len);
return NULL;
}
}
} else
ret=VirtualAlloc(NULL,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
return ret;
}
static void
DPMI_xfree(LPVOID ptr) {
VirtualFree(ptr,0,MEM_RELEASE);
}
/* FIXME: perhaps we could grow this mapped area... */
static LPVOID
DPMI_xrealloc(LPVOID ptr,DWORD newsize) {
MEMORY_BASIC_INFORMATION mbi;
LPVOID newptr;
newptr = DPMI_xalloc(newsize);
if (ptr) {
if (!VirtualQuery(ptr,&mbi,sizeof(mbi))) {
FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
return NULL;
}
if (mbi.State == MEM_FREE) {
FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
return NULL;
}
/* We do not shrink allocated memory. most reallocs
* only do grows anyway
*/
if (newsize<=mbi.RegionSize)
return ptr;
memcpy(newptr,ptr,mbi.RegionSize);
DPMI_xfree(ptr);
}
return newptr;
}
/**********************************************************************
* CallRMInt
*/
static void CallRMInt( CONTEXT86 *context )
{
if (!Dosvm.CallRMInt && !DPMI_LoadDosSystem())
{
ERR("could not setup real-mode calls\n");
return;
}
Dosvm.CallRMInt( context );
}
static void CallRMProc( CONTEXT86 *context, int iret )
{
if (!Dosvm.CallRMProc && !DPMI_LoadDosSystem())
{
ERR("could not setup real-mode calls\n");
return;
}
Dosvm.CallRMProc( context, iret );
}
static void AllocRMCB( CONTEXT86 *context )
{
if (!Dosvm.AllocRMCB && !DPMI_LoadDosSystem())
{
ERR("could not setup real-mode calls\n");
return;
}
Dosvm.AllocRMCB( context );
}
static void FreeRMCB( CONTEXT86 *context )
{
if (!Dosvm.FreeRMCB) /* cannot have allocated one if dosvm not loaded */
{
SET_LOWORD( context->Eax, 0x8024 ); /* invalid callback address */
SET_CFLAG( context );
}
else Dosvm.FreeRMCB( context );
}
static void RawModeSwitch( CONTEXT86 *context )
{
if (!Dosvm.RawModeSwitch)
{
ERR("could not setup real-mode calls\n");
return;
}
else
{
/*
* FIXME: This routine will not work if it is called
* from 32 bit DPMI program and the program returns
* to protected mode while ESP or EIP is over 0xffff.
* FIXME: This routine will not work if it is not called
* using 16-bit-to-Wine callback glue function.
*/
STACK16FRAME frame = *CURRENT_STACK16;
Dosvm.RawModeSwitch( context );
/*
* After this function returns to relay code, protected mode
* 16 bit stack will contain STACK16FRAME and single WORD
* (EFlags, see next comment).
*/
NtCurrentTeb()->cur_stack =
MAKESEGPTR( context->SegSs,
context->Esp - sizeof(STACK16FRAME) - sizeof(WORD) );
/*
* After relay code returns to glue function, protected
* mode 16 bit stack will contain interrupt return record:
* IP, CS and EFlags. Since EFlags is ignored, it won't
* need to be initialized.
*/
context->Esp -= 3 * sizeof(WORD);
/*
* Restore stack frame so that relay code won't be confused.
* It should be noted that relay code overwrites IP and CS
* in STACK16FRAME with values taken from current CONTEXT86.
* These values are what is returned to glue function
* (see previous comment).
*/
*CURRENT_STACK16 = frame;
}
}
/**********************************************************************
* INT_Int31Handler (WPROCS.149)
*
* Handler for int 31h (DPMI).
*/
void WINAPI INT_Int31Handler( CONTEXT86 *context )
{
/*
* Note: For Win32s processes, the whole linear address space is
* shifted by 0x10000 relative to the OS linear address space.
* See the comment in msdos/vxd.c.
*/
DWORD dw;
BYTE *ptr;
if (context->SegCs == DOSMEM_dpmi_segments.dpmi_sel) {
RawModeSwitch( context );
return;
}
RESET_CFLAG(context);
switch(AX_reg(context))
{
case 0x0000: /* Allocate LDT descriptors */
TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
if (!(context->Eax = AllocSelectorArray16( CX_reg(context) )))
{
TRACE("failed\n");
context->Eax = 0x8011; /* descriptor unavailable */
SET_CFLAG(context);
}
TRACE("success, array starts at 0x%04x\n",AX_reg(context));
break;
case 0x0001: /* Free LDT descriptor */
TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
if (FreeSelector16( BX_reg(context) ))
{
context->Eax = 0x8022; /* invalid selector */
SET_CFLAG(context);
}
else
{
/* If a segment register contains the selector being freed, */
/* set it to zero. */
if (!((context->SegDs^BX_reg(context)) & ~3)) context->SegDs = 0;
if (!((context->SegEs^BX_reg(context)) & ~3)) context->SegEs = 0;
if (!((context->SegFs^BX_reg(context)) & ~3)) context->SegFs = 0;
if (!((context->SegGs^BX_reg(context)) & ~3)) context->SegGs = 0;
}
break;
case 0x0002: /* Real mode segment to descriptor */
TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
{
WORD entryPoint = 0; /* KERNEL entry point for descriptor */
switch(BX_reg(context))
{
case 0x0000: entryPoint = 183; break; /* __0000H */
case 0x0040: entryPoint = 193; break; /* __0040H */
case 0xa000: entryPoint = 174; break; /* __A000H */
case 0xb000: entryPoint = 181; break; /* __B000H */
case 0xb800: entryPoint = 182; break; /* __B800H */
case 0xc000: entryPoint = 195; break; /* __C000H */
case 0xd000: entryPoint = 179; break; /* __D000H */
case 0xe000: entryPoint = 190; break; /* __E000H */
case 0xf000: entryPoint = 194; break; /* __F000H */
default:
context->Eax = DOSMEM_AllocSelector(BX_reg(context));
break;
}
if (entryPoint)
context->Eax = LOWORD(GetProcAddress16( GetModuleHandle16( "KERNEL" ),
(LPCSTR)(ULONG_PTR)entryPoint ));
}
break;
case 0x0003: /* Get next selector increment */
TRACE("get selector increment (__AHINCR)\n");
context->Eax = __AHINCR;
break;
case 0x0004: /* Lock selector (not supported) */
FIXME("lock selector not supported\n");
context->Eax = 0; /* FIXME: is this a correct return value? */
break;
case 0x0005: /* Unlock selector (not supported) */
FIXME("unlock selector not supported\n");
context->Eax = 0; /* FIXME: is this a correct return value? */
break;
case 0x0006: /* Get selector base address */
TRACE("get selector base address (0x%04x)\n",BX_reg(context));
if (!(dw = GetSelectorBase( BX_reg(context) )))
{
context->Eax = 0x8022; /* invalid selector */
SET_CFLAG(context);
}
else
{
SET_CX( context, HIWORD(W32S_WINE2APP(dw)) );
SET_DX( context, LOWORD(W32S_WINE2APP(dw)) );
}
break;
case 0x0007: /* Set selector base address */
TRACE("set selector base address (0x%04x,0x%08lx)\n",
BX_reg(context),
W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context))));
dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)));
if (dw < 0x10000)
/* app wants to access lower 64K of DOS memory, load DOS subsystem */
DPMI_LoadDosSystem();
SetSelectorBase(BX_reg(context), dw);
break;
case 0x0008: /* Set selector limit */
TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
dw = MAKELONG( DX_reg(context), CX_reg(context) );
SetSelectorLimit16( BX_reg(context), dw );
break;
case 0x0009: /* Set selector access rights */
TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
break;
case 0x000a: /* Allocate selector alias */
TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
if (!SET_AX( context, AllocCStoDSAlias16( BX_reg(context) )))
{
SET_AX( context, 0x8011 ); /* descriptor unavailable */
SET_CFLAG(context);
}
break;
case 0x000b: /* Get descriptor */
TRACE("get descriptor (0x%04x)\n",BX_reg(context));
{
LDT_ENTRY entry;
wine_ldt_set_base( &entry, (void*)W32S_WINE2APP(wine_ldt_get_base(&entry)) );
/* FIXME: should use ES:EDI for 32-bit clients */
*(LDT_ENTRY *)MapSL( MAKESEGPTR( context->SegEs, LOWORD(context->Edi) )) = entry;
}
break;
case 0x000c: /* Set descriptor */
TRACE("set descriptor (0x%04x)\n",BX_reg(context));
{
LDT_ENTRY entry = *(LDT_ENTRY *)MapSL(MAKESEGPTR( context->SegEs, LOWORD(context->Edi)));
wine_ldt_set_base( &entry, (void*)W32S_APP2WINE(wine_ldt_get_base(&entry)) );
wine_ldt_set_entry( LOWORD(context->Ebx), &entry );
}
break;
case 0x000d: /* Allocate specific LDT descriptor */
FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
SET_AX( context, 0x8011 ); /* descriptor unavailable */
SET_CFLAG(context);
break;
case 0x0100: /* Allocate DOS memory block */
TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
if (dw) {
SET_AX( context, HIWORD(dw) );
SET_DX( context, LOWORD(dw) );
} else {
SET_AX( context, 0x0008 ); /* insufficient memory */
SET_BX( context, DOSMEM_Available()>>4 );
SET_CFLAG(context);
}
break;
case 0x0101: /* Free DOS memory block */
TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
dw = GlobalDOSFree16(DX_reg(context));
if (!dw) {
SET_AX( context, 0x0009 ); /* memory block address invalid */
SET_CFLAG(context);
}
break;
case 0x0200: /* get real mode interrupt vector */
FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
BL_reg(context));
SET_CFLAG(context);
break;
case 0x0201: /* set real mode interrupt vector */
FIXME("set realmode interrupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
SET_CFLAG(context);
break;
case 0x0204: /* Get protected mode interrupt vector */
TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
SET_CX( context, HIWORD(dw) );
SET_DX( context, LOWORD(dw) );
break;
case 0x0205: /* Set protected mode interrupt vector */
TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
BL_reg(context),MapSL(MAKESEGPTR(CX_reg(context),DX_reg(context))));
INT_SetPMHandler( BL_reg(context),
(FARPROC16)MAKESEGPTR( CX_reg(context), DX_reg(context) ));
break;
case 0x0300: /* Simulate real mode interrupt */
CallRMInt( context );
break;
case 0x0301: /* Call real mode procedure with far return */
CallRMProc( context, FALSE );
break;
case 0x0302: /* Call real mode procedure with interrupt return */
CallRMProc( context, TRUE );
break;
case 0x0303: /* Allocate Real Mode Callback Address */
AllocRMCB( context );
break;
case 0x0304: /* Free Real Mode Callback Address */
FreeRMCB( context );
break;
case 0x0305: /* Get State Save/Restore Addresses */
TRACE("get state save/restore addresses\n");
/* we probably won't need this kind of state saving */
SET_AX( context, 0 );
/* real mode: just point to the lret */
SET_BX( context, DOSMEM_dpmi_segments.wrap_seg );
context->Ecx = 2;
/* protected mode: don't have any handler yet... */
FIXME("no protected-mode dummy state save/restore handler yet\n");
SET_SI( context, 0 );
context->Edi = 0;
break;
case 0x0306: /* Get Raw Mode Switch Addresses */
TRACE("get raw mode switch addresses\n");
/* real mode, point to standard DPMI return wrapper */
SET_BX( context, DOSMEM_dpmi_segments.wrap_seg );
context->Ecx = 0;
/* protected mode, point to DPMI call wrapper */
SET_SI( context, DOSMEM_dpmi_segments.dpmi_sel );
context->Edi = 8; /* offset of the INT 0x31 call */
break;
case 0x0400: /* Get DPMI version */
TRACE("get DPMI version\n");
{
SYSTEM_INFO si;
GetSystemInfo(&si);
SET_AX( context, 0x005a ); /* DPMI version 0.90 */
SET_BX( context, 0x0005 ); /* Flags: 32-bit, virtual memory */
SET_CL( context, si.wProcessorLevel );
SET_DX( context, 0x0102 ); /* Master/slave interrupt controller base*/
break;
}
case 0x0500: /* Get free memory information */
TRACE("get free memory information\n");
{
MEMMANINFO mmi;
mmi.dwSize = sizeof(mmi);
MemManInfo16(&mmi);
ptr = MapSL(MAKESEGPTR(context->SegEs,DI_reg(context)));
/* the layout is just the same as MEMMANINFO, but without
* the dwSize entry.
*/
memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
break;
}
case 0x0501: /* Allocate memory block */
TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
{
SET_AX( context, 0x8012 ); /* linear memory not available */
SET_CFLAG(context);
} else {
SET_BX( context, HIWORD(W32S_WINE2APP(ptr)) );
SET_CX( context, LOWORD(W32S_WINE2APP(ptr)) );
SET_SI( context, HIWORD(W32S_WINE2APP(ptr)) );
SET_DI( context, LOWORD(W32S_WINE2APP(ptr)) );
}
break;
case 0x0502: /* Free memory block */
TRACE("free memory block (0x%08lx)\n",
W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))));
DPMI_xfree( (void *)W32S_APP2WINE(MAKELONG(DI_reg(context), SI_reg(context))) );
break;
case 0x0503: /* Resize memory block */
TRACE("resize memory block (0x%08lx,%ld)\n",
W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))),
MAKELONG(CX_reg(context),BX_reg(context)));
if (!(ptr = (BYTE *)DPMI_xrealloc(
(void *)W32S_APP2WINE(MAKELONG(DI_reg(context),SI_reg(context))),
MAKELONG(CX_reg(context),BX_reg(context)))))
{
SET_AX( context, 0x8012 ); /* linear memory not available */
SET_CFLAG(context);
} else {
SET_BX( context, HIWORD(W32S_WINE2APP(ptr)) );
SET_CX( context, LOWORD(W32S_WINE2APP(ptr)) );
SET_SI( context, HIWORD(W32S_WINE2APP(ptr)) );
SET_DI( context, LOWORD(W32S_WINE2APP(ptr)) );
}
break;
case 0x0507: /* Modify page attributes */
FIXME("modify page attributes unimplemented\n");
break; /* Just ignore it */
case 0x0600: /* Lock linear region */
FIXME("lock linear region unimplemented\n");
break; /* Just ignore it */
case 0x0601: /* Unlock linear region */
FIXME("unlock linear region unimplemented\n");
break; /* Just ignore it */
case 0x0602: /* Unlock real-mode region */
FIXME("unlock realmode region unimplemented\n");
break; /* Just ignore it */
case 0x0603: /* Lock real-mode region */
FIXME("lock realmode region unimplemented\n");
break; /* Just ignore it */
case 0x0604: /* Get page size */
TRACE("get pagesize\n");
SET_BX( context, 0 );
SET_CX( context, getpagesize() );
break;
case 0x0702: /* Mark page as demand-paging candidate */
FIXME("mark page as demand-paging candidate\n");
break; /* Just ignore it */
case 0x0703: /* Discard page contents */
FIXME("discard page contents\n");
break; /* Just ignore it */
case 0x0800: /* Physical address mapping */
FIXME("map real to linear (0x%08lx)\n",MAKELONG(CX_reg(context),BX_reg(context)));
if(!(ptr=DOSMEM_MapRealToLinear(MAKELONG(CX_reg(context),BX_reg(context)))))
{
SET_AX( context, 0x8021 );
SET_CFLAG(context);
}
else
{
SET_BX( context, HIWORD(W32S_WINE2APP(ptr)) );
SET_CX( context, LOWORD(W32S_WINE2APP(ptr)) );
RESET_CFLAG(context);
}
break;
default:
INT_BARF( context, 0x31 );
SET_AX( context, 0x8001 ); /* unsupported function */
SET_CFLAG(context);
break;
}
}
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