4 * Copyright 1995 Alexandre Julliard
5 * Copyright 1996 Marcus Meissner
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "wine/port.h"
28 #include <sys/types.h>
29 #ifdef HAVE_SYS_MMAN_H
30 # include <sys/mman.h>
34 #include "wine/winbase16.h"
37 #include "selectors.h"
39 #include "wine/debug.h"
41 WINE_DEFAULT_DEBUG_CHANNEL(dosmem
);
42 WINE_DECLARE_DEBUG_CHANNEL(selector
);
44 WORD DOSMEM_0000H
; /* segment at 0:0 */
45 WORD DOSMEM_BiosDataSeg
; /* BIOS data segment at 0x40:0 */
46 WORD DOSMEM_BiosSysSeg
; /* BIOS ROM segment at 0xf000:0 */
48 DWORD DOSMEM_CollateTable
;
50 static int StructOffset
[256]; /* Offsets for all structures at f000:e000*/
51 static int CurrentStructOffset
= 0xe000; /* Current free offset */
53 /* use 2 low bits of 'size' for the housekeeping */
55 #define DM_BLOCK_DEBUG 0xABE00000
56 #define DM_BLOCK_TERMINAL 0x00000001
57 #define DM_BLOCK_FREE 0x00000002
58 #define DM_BLOCK_MASK 0x001FFFFC
61 #define __DOSMEM_DEBUG__
73 #define NEXT_BLOCK(block) \
74 (dosmem_entry*)(((char*)(block)) + \
75 sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK))
77 #define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
78 #define VM_STUB_SEGMENT 0xf000 /* BIOS segment */
81 static char *DOSMEM_dosmem
;
82 /* DOS system base (for interrupt vector table and BIOS data area)
83 * ...should in theory (i.e. Windows) be equal to DOSMEM_dosmem (NULL),
84 * but is normally set to 0xf0000 in Wine to allow trapping of NULL pointers,
85 * and only relocated to NULL when absolutely necessary */
86 static char *DOSMEM_sysmem
;
88 /* various real-mode code stubs */
96 /***********************************************************************
99 * Gets the virtual DOS memory base (interrupt table).
101 char *DOSMEM_SystemBase(void)
103 return DOSMEM_sysmem
;
106 /***********************************************************************
109 * Gets the DOS memory base.
111 char *DOSMEM_MemoryBase(void)
113 return DOSMEM_dosmem
;
116 /***********************************************************************
119 * Gets the DOS memory top.
121 static char *DOSMEM_MemoryTop(void)
123 return DOSMEM_dosmem
+0x9FFFC; /* 640K */
126 /***********************************************************************
129 * Gets the DOS memory info block.
131 static dosmem_info
*DOSMEM_InfoBlock(void)
133 return (dosmem_info
*)(DOSMEM_dosmem
+0x10000); /* 64K */
136 /***********************************************************************
139 * Gets the DOS memory root block.
141 static dosmem_entry
*DOSMEM_RootBlock(void)
143 /* first block has to be paragraph-aligned */
144 return (dosmem_entry
*)(((char*)DOSMEM_InfoBlock()) +
145 ((((sizeof(dosmem_info
) + 0xf) & ~0xf) - sizeof(dosmem_entry
))));
148 /***********************************************************************
149 * DOSMEM_FillIsrTable
151 * Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000).
154 * Linux normally only traps INTs performed from or destined to BIOSSEG
155 * for us to handle, if the int_revectored table is empty. Filling the
156 * interrupt table with calls to INT stubs in BIOSSEG allows DOS programs
157 * to hook interrupts, as well as use their familiar retf tricks to call
158 * them, AND let Wine handle any unhooked interrupts transparently.
160 static void DOSMEM_FillIsrTable(void)
162 SEGPTR
*isr
= (SEGPTR
*)DOSMEM_sysmem
;
165 for (x
=0; x
<256; x
++) isr
[x
]=MAKESEGPTR(VM_STUB_SEGMENT
,x
*4);
168 static void DOSMEM_MakeIsrStubs(void)
170 DWORD
*stub
= (DWORD
*)(DOSMEM_dosmem
+ (VM_STUB_SEGMENT
<< 4));
173 for (x
=0; x
<256; x
++) stub
[x
]=VM_STUB(x
);
176 /***********************************************************************
179 * Allocate the global DPMI RMCB wrapper.
181 static void DOSMEM_InitDPMI(void)
185 static const char wrap_code
[]={
186 0xCD,0x31, /* int $0x31 */
190 static const char enter_xms
[]=
192 /* XMS hookable entry point */
193 0xEB,0x03, /* jmp entry */
194 0x90,0x90,0x90, /* nop;nop;nop */
196 /* real entry point */
197 /* for simplicity, we'll just use the same hook as DPMI below */
198 0xCD,0x31, /* int $0x31 */
202 static const char enter_pm
[]=
204 0x50, /* pushw %ax */
205 0x52, /* pushw %dx */
206 0x55, /* pushw %bp */
207 0x89,0xE5, /* movw %sp,%bp */
209 0x8B,0x56,0x08, /* movw 8(%bp),%dx */
210 /* just call int 31 here to get into protected mode... */
211 /* it'll check whether it was called from dpmi_seg... */
212 0xCD,0x31, /* int $0x31 */
213 /* we are now in the context of a 16-bit relay call */
214 /* need to fixup our stack;
215 * 16-bit relay return address will be lost, but we won't worry quite yet */
216 0x8E,0xD0, /* movw %ax,%ss */
217 0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
219 0x89,0x56,0x08, /* movw %dx,8(%bp) */
226 ptr
= DOSMEM_GetBlock( sizeof(wrap_code
), &DOSMEM_wrap_seg
);
227 memcpy( ptr
, wrap_code
, sizeof(wrap_code
) );
228 ptr
= DOSMEM_GetBlock( sizeof(enter_xms
), &DOSMEM_xms_seg
);
229 memcpy( ptr
, enter_xms
, sizeof(enter_xms
) );
230 ptr
= DOSMEM_GetBlock( sizeof(enter_pm
), &DOSMEM_dpmi_seg
);
231 memcpy( ptr
, enter_pm
, sizeof(enter_pm
) );
232 DOSMEM_dpmi_sel
= SELECTOR_AllocBlock( ptr
, sizeof(enter_pm
), WINE_LDT_FLAGS_CODE
);
235 BIOSDATA
* DOSMEM_BiosData()
237 return (BIOSDATA
*)(DOSMEM_sysmem
+ 0x400);
240 BYTE
* DOSMEM_BiosSys()
242 return DOSMEM_dosmem
+0xf0000;
245 /* Add a structure in the BiosSys area (with size and index) and
247 WORD
DOSMEM_AddBiosSysStruct(int size
,int index
)
249 int Offset
= CurrentStructOffset
;
250 StructOffset
[index
]= CurrentStructOffset
;
251 CurrentStructOffset
+= size
;
255 /* Return the offset of a structure specified by the index */
256 WORD
DOSMEM_GetBiosSysStructOffset(int index
)
258 return StructOffset
[index
];
262 /***********************************************************************
263 * DOSMEM_FillBiosSegments
265 * Fill the BIOS data segment with dummy values.
267 static void DOSMEM_FillBiosSegments(void)
269 BYTE
*pBiosSys
= DOSMEM_BiosSys();
270 BYTE
*pBiosROMTable
= pBiosSys
+0xe6f5;
271 BIOSDATA
*pBiosData
= DOSMEM_BiosData();
273 /* Supported VESA mode, see int10.c */
274 WORD ConstVesaModeList
[]={0x00,0x01,0x02,0x03,0x07,0x0D,0x0E,0x10,0x12,0x13,
275 0x100,0x101,0x102,0x103,0x104,0x105,0x106,0x107,0x10D,0x10E,
276 0x10F,0x110,0x111,0x112,0x113,0x114,0x115,0x116,0x117,0x118,
277 0x119,0x11A,0x11B,0xFFFF};
278 char * ConstVesaString
= "WINE SVGA BOARD";
281 VIDEOFUNCTIONALITY
*pVidFunc
= (VIDEOFUNCTIONALITY
*)
282 (pBiosSys
+DOSMEM_AddBiosSysStruct(sizeof(VIDEOFUNCTIONALITY
),OFF_VIDEOFUNCTIONALITY
));
283 VIDEOSTATE
*pVidState
= (VIDEOSTATE
*)
284 (pBiosSys
+DOSMEM_AddBiosSysStruct(sizeof(VIDEOSTATE
),OFF_VIDEOSTATE
));
285 VESAINFO
*pVesaInfo
= (VESAINFO
*)
286 (pBiosSys
+DOSMEM_AddBiosSysStruct(sizeof(VESAINFO
),OFF_VESAINFO
));
287 char * VesaString
= (char *)
288 (pBiosSys
+DOSMEM_AddBiosSysStruct(strlen(ConstVesaString
)+1,OFF_VESASTRING
));
289 WORD
* VesaModeList
= (WORD
*)
290 (pBiosSys
+DOSMEM_AddBiosSysStruct(sizeof(ConstVesaModeList
),OFF_VESAMODELIST
));
292 /* Clear all unused values */
293 memset( pBiosData
, 0, sizeof(*pBiosData
) );
294 memset( pVidFunc
, 0, sizeof(*pVidFunc
) );
295 memset( pVidState
, 0, sizeof(*pVidState
) );
296 memset( pVesaInfo
, 0, sizeof(*pVesaInfo
) );
298 /* FIXME: should check the number of configured drives and ports */
299 pBiosData
->Com1Addr
= 0x3f8;
300 pBiosData
->Com2Addr
= 0x2f8;
301 pBiosData
->Lpt1Addr
= 0x378;
302 pBiosData
->Lpt2Addr
= 0x278;
303 pBiosData
->InstalledHardware
= 0x5463;
304 pBiosData
->MemSize
= 640;
305 pBiosData
->NextKbdCharPtr
= 0x1e;
306 pBiosData
->FirstKbdCharPtr
= 0x1e;
307 pBiosData
->VideoMode
= 3;
308 pBiosData
->VideoColumns
= 80;
309 pBiosData
->VideoPageSize
= 80 * 25 * 2;
310 pBiosData
->VideoPageStartAddr
= 0xb800;
311 pBiosData
->VideoCtrlAddr
= 0x3d4;
312 pBiosData
->Ticks
= INT1A_GetTicksSinceMidnight();
313 pBiosData
->NbHardDisks
= 2;
314 pBiosData
->KbdBufferStart
= 0x1e;
315 pBiosData
->KbdBufferEnd
= 0x3e;
316 pBiosData
->RowsOnScreenMinus1
= 24;
317 pBiosData
->BytesPerChar
= 0x10;
318 pBiosData
->ModeOptions
= 0x64;
319 pBiosData
->FeatureBitsSwitches
= 0xf9;
320 pBiosData
->VGASettings
= 0x51;
321 pBiosData
->DisplayCombination
= 0x08;
322 pBiosData
->DiskDataRate
= 0;
324 /* fill ROM configuration table (values from Award) */
325 *(pBiosROMTable
+0x0) = 0x08; /* number of bytes following LO */
326 *(pBiosROMTable
+0x1) = 0x00; /* number of bytes following HI */
327 *(pBiosROMTable
+0x2) = 0xfc; /* model */
328 *(pBiosROMTable
+0x3) = 0x01; /* submodel */
329 *(pBiosROMTable
+0x4) = 0x00; /* BIOS revision */
330 *(pBiosROMTable
+0x5) = 0x74; /* feature byte 1 */
331 *(pBiosROMTable
+0x6) = 0x00; /* feature byte 2 */
332 *(pBiosROMTable
+0x7) = 0x00; /* feature byte 3 */
333 *(pBiosROMTable
+0x8) = 0x00; /* feature byte 4 */
334 *(pBiosROMTable
+0x9) = 0x00; /* feature byte 5 */
337 for (i
= 0; i
< 7; i
++)
338 pVidFunc
->ModeSupport
[i
] = 0xff;
340 pVidFunc
->ScanlineSupport
= 7;
341 pVidFunc
->NumberCharBlocks
= 0;
342 pVidFunc
->ActiveCharBlocks
= 0;
343 pVidFunc
->MiscFlags
= 0x8ff;
344 pVidFunc
->SavePointerFlags
= 0x3f;
346 /* FIXME: always real mode ? */
347 pVidState
->StaticFuncTable
= (0xf000<<16)+DOSMEM_GetBiosSysStructOffset(OFF_VIDEOFUNCTIONALITY
);
348 pVidState
->VideoMode
= pBiosData
->VideoMode
; /* needs updates! */
349 pVidState
->NumberColumns
= pBiosData
->VideoColumns
; /* needs updates! */
350 pVidState
->RegenBufLen
= 0;
351 pVidState
->RegenBufAddr
= 0;
353 for (i
= 0; i
< 8; i
++)
354 pVidState
->CursorPos
[i
] = 0;
356 pVidState
->CursorType
= 0x0a0b; /* start/end line */
357 pVidState
->ActivePage
= 0;
358 pVidState
->CRTCPort
= 0x3da;
359 pVidState
->Port3x8
= 0;
360 pVidState
->Port3x9
= 0;
361 pVidState
->NumberRows
= 23; /* number of rows - 1 */
362 pVidState
->BytesPerChar
= 0x10;
363 pVidState
->DCCActive
= pBiosData
->DisplayCombination
;
364 pVidState
->DCCAlternate
= 0;
365 pVidState
->NumberColors
= 16;
366 pVidState
->NumberPages
= 1;
367 pVidState
->NumberScanlines
= 3; /* (0,1,2,3) = (200,350,400,480) */
368 pVidState
->CharBlockPrimary
= 0;
369 pVidState
->CharBlockSecondary
= 0;
370 pVidState
->MiscFlags
=
371 (pBiosData
->VGASettings
& 0x0f)
372 | ((pBiosData
->ModeOptions
& 1) << 4); /* cursor emulation */
373 pVidState
->NonVGASupport
= 0;
374 pVidState
->VideoMem
= (pBiosData
->ModeOptions
& 0x60 >> 5);
375 pVidState
->SavePointerState
= 0;
376 pVidState
->DisplayStatus
= 4;
378 /* SVGA structures */
379 pVesaInfo
->Signature
= *(DWORD
*)"VESA";
380 pVesaInfo
->Major
= 2;
381 pVesaInfo
->Minor
= 0;
382 /* FIXME: always real mode ? */
383 pVesaInfo
->StaticVendorString
= (0xF000<<16)+DOSMEM_GetBiosSysStructOffset(OFF_VESASTRING
);
384 pVesaInfo
->CapabilitiesFlags
= 0xfffffffd; /* FIXME: not really supported */
385 /* FIXME: always real mode ? */
386 pVesaInfo
->StaticModeList
= (0xF000<<16)+DOSMEM_GetBiosSysStructOffset(OFF_VESAMODELIST
);
388 strcpy(VesaString
,ConstVesaString
);
389 memcpy(VesaModeList
,ConstVesaModeList
,sizeof(ConstVesaModeList
));
391 /* BIOS date string */
392 strcpy((char *)pBiosSys
+0xfff5, "13/01/99");
395 *(pBiosSys
+0xfffe) = 0xfc;
398 /***********************************************************************
399 * DOSMEM_InitCollateTable
401 * Initialises the collate table (character sorting, language dependent)
403 static void DOSMEM_InitCollateTable()
409 x
= GlobalDOSAlloc16(258);
410 DOSMEM_CollateTable
= MAKELONG(0,(x
>>16));
411 tbl
= DOSMEM_MapRealToLinear(DOSMEM_CollateTable
);
414 for ( i
= 0; i
< 0x100; i
++) *tbl
++ = i
;
417 /***********************************************************************
418 * DOSMEM_InitErrorTable
420 * Initialises the error tables (DOS 5+)
422 static void DOSMEM_InitErrorTable()
424 #if 0 /* no longer used */
428 /* We will use a snippet of real mode code that calls */
429 /* a WINE-only interrupt to handle moving the requested */
430 /* message into the buffer... */
432 /* FIXME - There is still something wrong... */
434 /* FIXME - Find hex values for opcodes...
436 (On call, AX contains message number
437 DI contains 'offset' (??)
438 Resturn, ES:DI points to counted string )
442 MOV AX, (arbitrary subfunction number)
443 INT (WINE-only interrupt)
450 const int buffer
= 80;
451 const int SIZE_TO_ALLOCATE
= code
+ buffer
;
453 /* FIXME - Complete rewrite of the table system to save */
454 /* precious DOS space. Now, we return the 0001:???? as */
455 /* DOS 4+ (??, it seems to be the case in MS 7.10) treats that */
456 /* as a special case and programs will use the alternate */
457 /* interface (a farcall returned with INT 24 (AX = 0x122e, DL = */
458 /* 0x08) which lets us have a smaller memory footprint anyway. */
460 x
= GlobalDOSAlloc16(SIZE_TO_ALLOCATE
);
462 DOSMEM_ErrorCall
= MAKELONG(0,(x
>>16));
463 DOSMEM_ErrorBuffer
= DOSMEM_ErrorCall
+ code
;
465 call
= DOSMEM_MapRealToLinear(DOSMEM_ErrorCall
);
467 memset(call
, 0, SIZE_TO_ALLOCATE
);
469 /* FIXME - Copy assembly into buffer here */
472 /***********************************************************************
475 * Initialises the DOS memory structures.
477 static void DOSMEM_InitMemory(void)
479 /* Low 64Kb are reserved for DOS/BIOS so the useable area starts at
480 * 1000:0000 and ends at 9FFF:FFEF. */
482 dosmem_info
* info_block
= DOSMEM_InfoBlock();
483 dosmem_entry
* root_block
= DOSMEM_RootBlock();
486 root_block
->size
= DOSMEM_MemoryTop() - (((char*)root_block
) + sizeof(dosmem_entry
));
488 info_block
->blocks
= 0;
489 info_block
->free
= root_block
->size
;
491 dm
= NEXT_BLOCK(root_block
);
492 dm
->size
= DM_BLOCK_TERMINAL
;
493 root_block
->size
|= DM_BLOCK_FREE
494 #ifdef __DOSMEM_DEBUG__
500 /**********************************************************************
503 * Setup the first megabyte for DOS memory access
505 static void setup_dos_mem( int dos_init
)
508 int page_size
= getpagesize();
509 void *addr
= wine_anon_mmap( (void *)page_size
, 0x110000-page_size
,
510 PROT_READ
| PROT_WRITE
| PROT_EXEC
, 0 );
511 if (addr
== (void *)page_size
) /* we got what we wanted */
513 /* now map from address 0 */
514 addr
= wine_anon_mmap( NULL
, 0x110000, PROT_READ
| PROT_WRITE
| PROT_EXEC
, MAP_FIXED
);
517 ERR("MAP_FIXED failed at address 0 for DOS address space\n" );
521 /* inform the memory manager that there is a mapping here */
522 VirtualAlloc( addr
, 0x110000, MEM_RESERVE
| MEM_SYSTEM
, PAGE_EXECUTE_READWRITE
);
524 /* protect the first 64K to catch NULL pointers */
527 VirtualProtect( addr
, 0x10000, PAGE_NOACCESS
, NULL
);
528 /* move the BIOS and ISR area from 0x00000 to 0xf0000 */
529 sys_offset
+= 0xf0000;
534 ERR("Cannot use first megabyte for DOS address space, please report\n" );
535 if (dos_init
) ExitProcess(1);
536 /* allocate the DOS area somewhere else */
537 addr
= VirtualAlloc( NULL
, 0x110000, MEM_COMMIT
, PAGE_EXECUTE_READWRITE
);
540 ERR( "Cannot allocate DOS memory\n" );
544 DOSMEM_dosmem
= addr
;
545 DOSMEM_sysmem
= (char*)addr
+ sys_offset
;
549 /***********************************************************************
552 * Create the dos memory segments, and store them into the KERNEL
555 BOOL
DOSMEM_Init(BOOL dos_init
)
557 static int already_done
, already_mapped
;
561 setup_dos_mem( dos_init
);
563 DOSMEM_0000H
= GLOBAL_CreateBlock( GMEM_FIXED
, DOSMEM_sysmem
,
564 0x10000, 0, WINE_LDT_FLAGS_DATA
);
565 DOSMEM_BiosDataSeg
= GLOBAL_CreateBlock(GMEM_FIXED
,DOSMEM_sysmem
+ 0x400,
566 0x100, 0, WINE_LDT_FLAGS_DATA
);
567 DOSMEM_BiosSysSeg
= GLOBAL_CreateBlock(GMEM_FIXED
,DOSMEM_dosmem
+0xf0000,
568 0x10000, 0, WINE_LDT_FLAGS_DATA
);
569 DOSMEM_FillBiosSegments();
570 DOSMEM_FillIsrTable();
572 DOSMEM_InitCollateTable();
573 DOSMEM_InitErrorTable();
577 else if (dos_init
&& !already_mapped
)
581 ERR( "Needs access to the first megabyte for DOS mode\n" );
584 MESSAGE( "Warning: unprotecting the first 64KB of memory to allow real-mode calls.\n"
585 " NULL pointer accesses will no longer be caught.\n" );
586 VirtualProtect( NULL
, 0x10000, PAGE_EXECUTE_READWRITE
, NULL
);
587 /* copy the BIOS and ISR area down */
588 memcpy( DOSMEM_dosmem
, DOSMEM_sysmem
, 0x400 + 0x100 );
589 DOSMEM_sysmem
= DOSMEM_dosmem
;
590 SetSelectorBase( DOSMEM_0000H
, 0 );
591 SetSelectorBase( DOSMEM_BiosDataSeg
, 0x400 );
592 /* we may now need the actual interrupt stubs, and since we've just moved the
593 * interrupt vector table away, we can fill the area with stubs instead... */
594 DOSMEM_MakeIsrStubs();
601 /***********************************************************************
604 * Increment the BIOS tick counter. Called by timer signal handler.
606 void DOSMEM_Tick( WORD timer
)
608 BIOSDATA
*pBiosData
= DOSMEM_BiosData();
609 if (pBiosData
) pBiosData
->Ticks
++;
612 /***********************************************************************
615 * Carve a chunk of the DOS memory block (without selector).
617 LPVOID
DOSMEM_GetBlock(UINT size
, UINT16
* pseg
)
621 dosmem_info
*info_block
= DOSMEM_InfoBlock();
623 #ifdef __DOSMEM_DEBUG_
624 dosmem_entry
*prev
= NULL
;
627 if( size
> info_block
->free
) return NULL
;
628 dm
= DOSMEM_RootBlock();
630 while (dm
&& dm
->size
!= DM_BLOCK_TERMINAL
)
632 #ifdef __DOSMEM_DEBUG__
633 if( (dm
->size
& DM_BLOCK_DEBUG
) != DM_BLOCK_DEBUG
)
635 WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT
)prev
);
640 if( dm
->size
& DM_BLOCK_FREE
)
642 dosmem_entry
*next
= NEXT_BLOCK(dm
);
644 while( next
->size
& DM_BLOCK_FREE
) /* collapse free blocks */
646 dm
->size
+= sizeof(dosmem_entry
) + (next
->size
& DM_BLOCK_MASK
);
647 next
->size
= (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
);
648 next
= NEXT_BLOCK(dm
);
651 blocksize
= dm
->size
& DM_BLOCK_MASK
;
652 if( blocksize
>= size
)
654 block
= ((char*)dm
) + sizeof(dosmem_entry
);
655 if( blocksize
- size
> 0x20 )
657 /* split dm so that the next one stays
658 * paragraph-aligned (and dm loses free bit) */
660 dm
->size
= (((size
+ 0xf + sizeof(dosmem_entry
)) & ~0xf) -
661 sizeof(dosmem_entry
));
662 next
= (dosmem_entry
*)(((char*)dm
) +
663 sizeof(dosmem_entry
) + dm
->size
);
664 next
->size
= (blocksize
- (dm
->size
+
665 sizeof(dosmem_entry
))) | DM_BLOCK_FREE
666 #ifdef __DOSMEM_DEBUG__
670 } else dm
->size
&= DM_BLOCK_MASK
;
672 info_block
->blocks
++;
673 info_block
->free
-= dm
->size
;
674 if( pseg
) *pseg
= (block
- DOSMEM_dosmem
) >> 4;
675 #ifdef __DOSMEM_DEBUG__
676 dm
->size
|= DM_BLOCK_DEBUG
;
682 else dm
= NEXT_BLOCK(dm
);
684 return (LPVOID
)block
;
687 /***********************************************************************
690 BOOL
DOSMEM_FreeBlock(void* ptr
)
692 dosmem_info
*info_block
= DOSMEM_InfoBlock();
694 if( ptr
>= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry
)) &&
695 ptr
< (void*)DOSMEM_MemoryTop() && !((((char*)ptr
)
696 - DOSMEM_dosmem
) & 0xf) )
698 dosmem_entry
*dm
= (dosmem_entry
*)(((char*)ptr
) - sizeof(dosmem_entry
));
700 if( !(dm
->size
& (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
))
701 #ifdef __DOSMEM_DEBUG__
702 && ((dm
->size
& DM_BLOCK_DEBUG
) == DM_BLOCK_DEBUG
)
706 info_block
->blocks
--;
707 info_block
->free
+= dm
->size
;
709 dm
->size
|= DM_BLOCK_FREE
;
716 /***********************************************************************
719 LPVOID
DOSMEM_ResizeBlock(void* ptr
, UINT size
, UINT16
* pseg
)
722 dosmem_info
*info_block
= DOSMEM_InfoBlock();
724 if( ptr
>= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry
)) &&
725 ptr
< (void*)DOSMEM_MemoryTop() && !((((char*)ptr
)
726 - DOSMEM_dosmem
) & 0xf) )
728 dosmem_entry
*dm
= (dosmem_entry
*)(((char*)ptr
) - sizeof(dosmem_entry
));
730 if( pseg
) *pseg
= ((char*)ptr
- DOSMEM_dosmem
) >> 4;
732 if( !(dm
->size
& (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
))
735 dosmem_entry
*next
= NEXT_BLOCK(dm
);
736 UINT blocksize
, orgsize
= dm
->size
& DM_BLOCK_MASK
;
738 while( next
->size
& DM_BLOCK_FREE
) /* collapse free blocks */
740 dm
->size
+= sizeof(dosmem_entry
) + (next
->size
& DM_BLOCK_MASK
);
741 next
->size
= (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
);
742 next
= NEXT_BLOCK(dm
);
745 blocksize
= dm
->size
& DM_BLOCK_MASK
;
746 if (blocksize
>= size
)
748 block
= ((char*)dm
) + sizeof(dosmem_entry
);
749 if( blocksize
- size
> 0x20 )
751 /* split dm so that the next one stays
752 * paragraph-aligned (and next gains free bit) */
754 dm
->size
= (((size
+ 0xf + sizeof(dosmem_entry
)) & ~0xf) -
755 sizeof(dosmem_entry
));
756 next
= (dosmem_entry
*)(((char*)dm
) +
757 sizeof(dosmem_entry
) + dm
->size
);
758 next
->size
= (blocksize
- (dm
->size
+
759 sizeof(dosmem_entry
))) | DM_BLOCK_FREE
761 } else dm
->size
&= DM_BLOCK_MASK
;
763 info_block
->free
+= orgsize
- dm
->size
;
765 /* the collapse didn't help, try getting a new block */
766 block
= DOSMEM_GetBlock(size
, pseg
);
768 /* we got one, copy the old data there (we do need to, right?) */
769 memcpy(block
, ((char*)dm
) + sizeof(dosmem_entry
),
770 (size
<orgsize
) ? size
: orgsize
);
772 info_block
->blocks
--;
773 info_block
->free
+= dm
->size
;
775 dm
->size
|= DM_BLOCK_FREE
;
777 /* and Bill Gates said 640K should be enough for everyone... */
779 /* need to split original and collapsed blocks apart again,
780 * and free the collapsed blocks again, before exiting */
781 if( blocksize
- orgsize
> 0x20 )
783 /* split dm so that the next one stays
784 * paragraph-aligned (and next gains free bit) */
786 dm
->size
= (((orgsize
+ 0xf + sizeof(dosmem_entry
)) & ~0xf) -
787 sizeof(dosmem_entry
));
788 next
= (dosmem_entry
*)(((char*)dm
) +
789 sizeof(dosmem_entry
) + dm
->size
);
790 next
->size
= (blocksize
- (dm
->size
+
791 sizeof(dosmem_entry
))) | DM_BLOCK_FREE
793 } else dm
->size
&= DM_BLOCK_MASK
;
798 return (LPVOID
)block
;
802 /***********************************************************************
805 UINT
DOSMEM_Available(void)
807 UINT blocksize
, available
= 0;
810 dm
= DOSMEM_RootBlock();
812 while (dm
&& dm
->size
!= DM_BLOCK_TERMINAL
)
814 #ifdef __DOSMEM_DEBUG__
815 if( (dm
->size
& DM_BLOCK_DEBUG
) != DM_BLOCK_DEBUG
)
817 WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT
)prev
);
822 if( dm
->size
& DM_BLOCK_FREE
)
824 dosmem_entry
*next
= NEXT_BLOCK(dm
);
826 while( next
->size
& DM_BLOCK_FREE
) /* collapse free blocks */
828 dm
->size
+= sizeof(dosmem_entry
) + (next
->size
& DM_BLOCK_MASK
);
829 next
->size
= (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
);
830 next
= NEXT_BLOCK(dm
);
833 blocksize
= dm
->size
& DM_BLOCK_MASK
;
834 if ( blocksize
> available
) available
= blocksize
;
837 else dm
= NEXT_BLOCK(dm
);
843 /***********************************************************************
844 * DOSMEM_MapLinearToDos
846 * Linear address to the DOS address space.
848 UINT
DOSMEM_MapLinearToDos(LPVOID ptr
)
850 if (((char*)ptr
>= DOSMEM_dosmem
) &&
851 ((char*)ptr
< DOSMEM_dosmem
+ 0x100000))
852 return (UINT
)ptr
- (UINT
)DOSMEM_dosmem
;
857 /***********************************************************************
858 * DOSMEM_MapDosToLinear
860 * DOS linear address to the linear address space.
862 LPVOID
DOSMEM_MapDosToLinear(UINT ptr
)
864 if (ptr
< 0x100000) return (LPVOID
)(ptr
+ (UINT
)DOSMEM_dosmem
);
869 /***********************************************************************
870 * DOSMEM_MapRealToLinear
872 * Real mode DOS address into a linear pointer
874 LPVOID
DOSMEM_MapRealToLinear(DWORD x
)
878 lin
=DOSMEM_dosmem
+(x
&0xffff)+(((x
&0xffff0000)>>16)*16);
879 TRACE_(selector
)("(0x%08lx) returns %p.\n", x
, lin
);
883 /***********************************************************************
884 * DOSMEM_AllocSelector
886 * Allocates a protected mode selector for a realmode segment.
888 WORD
DOSMEM_AllocSelector(WORD realsel
)
890 HMODULE16 hModule
= GetModuleHandle16("KERNEL");
893 sel
=GLOBAL_CreateBlock( GMEM_FIXED
, DOSMEM_dosmem
+realsel
*16, 0x10000,
894 hModule
, WINE_LDT_FLAGS_DATA
);
895 TRACE_(selector
)("(0x%04x) returns 0x%04x.\n", realsel
,sel
);