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 /* use 2 low bits of 'size' for the housekeeping */
52 #define DM_BLOCK_DEBUG 0xABE00000
53 #define DM_BLOCK_TERMINAL 0x00000001
54 #define DM_BLOCK_FREE 0x00000002
55 #define DM_BLOCK_MASK 0x001FFFFC
58 #define __DOSMEM_DEBUG__
70 #define NEXT_BLOCK(block) \
71 (dosmem_entry*)(((char*)(block)) + \
72 sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK))
74 #define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
75 #define VM_STUB_SEGMENT 0xf000 /* BIOS segment */
78 static char *DOSMEM_dosmem
;
79 /* DOS system base (for interrupt vector table and BIOS data area)
80 * ...should in theory (i.e. Windows) be equal to DOSMEM_dosmem (NULL),
81 * but is normally set to 0xf0000 in Wine to allow trapping of NULL pointers,
82 * and only relocated to NULL when absolutely necessary */
83 static char *DOSMEM_sysmem
;
85 /* various real-mode code stubs */
86 struct DPMI_segments DOSMEM_dpmi_segments
;
88 /***********************************************************************
89 * DOSMEM_GetDPMISegments
91 const struct DPMI_segments
*DOSMEM_GetDPMISegments(void)
93 return &DOSMEM_dpmi_segments
;
96 /***********************************************************************
99 * Gets the DOS memory top.
101 static char *DOSMEM_MemoryTop(void)
103 return DOSMEM_dosmem
+0x9FFFC; /* 640K */
106 /***********************************************************************
109 * Gets the DOS memory info block.
111 static dosmem_info
*DOSMEM_InfoBlock(void)
113 return (dosmem_info
*)(DOSMEM_dosmem
+0x10000); /* 64K */
116 /***********************************************************************
119 * Gets the DOS memory root block.
121 static dosmem_entry
*DOSMEM_RootBlock(void)
123 /* first block has to be paragraph-aligned */
124 return (dosmem_entry
*)(((char*)DOSMEM_InfoBlock()) +
125 ((((sizeof(dosmem_info
) + 0xf) & ~0xf) - sizeof(dosmem_entry
))));
128 /***********************************************************************
129 * DOSMEM_FillIsrTable
131 * Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000).
134 * Linux normally only traps INTs performed from or destined to BIOSSEG
135 * for us to handle, if the int_revectored table is empty. Filling the
136 * interrupt table with calls to INT stubs in BIOSSEG allows DOS programs
137 * to hook interrupts, as well as use their familiar retf tricks to call
138 * them, AND let Wine handle any unhooked interrupts transparently.
140 static void DOSMEM_FillIsrTable(void)
142 SEGPTR
*isr
= (SEGPTR
*)DOSMEM_sysmem
;
145 for (x
=0; x
<256; x
++) isr
[x
]=MAKESEGPTR(VM_STUB_SEGMENT
,x
*4);
148 static void DOSMEM_MakeIsrStubs(void)
150 DWORD
*stub
= (DWORD
*)(DOSMEM_dosmem
+ (VM_STUB_SEGMENT
<< 4));
153 for (x
=0; x
<256; x
++) stub
[x
]=VM_STUB(x
);
156 /***********************************************************************
159 * Allocate the global DPMI RMCB wrapper.
161 static void DOSMEM_InitDPMI(void)
166 static const char wrap_code
[]={
167 0xCD,0x31, /* int $0x31 */
171 static const char enter_xms
[]=
173 /* XMS hookable entry point */
174 0xEB,0x03, /* jmp entry */
175 0x90,0x90,0x90, /* nop;nop;nop */
177 /* real entry point */
178 /* for simplicity, we'll just use the same hook as DPMI below */
179 0xCD,0x31, /* int $0x31 */
183 static const char enter_pm
[]=
185 0x50, /* pushw %ax */
186 0x52, /* pushw %dx */
187 0x55, /* pushw %bp */
188 0x89,0xE5, /* movw %sp,%bp */
190 0x8B,0x56,0x08, /* movw 8(%bp),%dx */
191 /* just call int 31 here to get into protected mode... */
192 /* it'll check whether it was called from dpmi_seg... */
193 0xCD,0x31, /* int $0x31 */
194 /* we are now in the context of a 16-bit relay call */
195 /* need to fixup our stack;
196 * 16-bit relay return address will be lost, but we won't worry quite yet */
197 0x8E,0xD0, /* movw %ax,%ss */
198 0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
200 0x89,0x56,0x08, /* movw %dx,8(%bp) */
207 ptr
= DOSMEM_GetBlock( sizeof(wrap_code
), &DOSMEM_dpmi_segments
.wrap_seg
);
208 memcpy( ptr
, wrap_code
, sizeof(wrap_code
) );
209 ptr
= DOSMEM_GetBlock( sizeof(enter_xms
), &DOSMEM_dpmi_segments
.xms_seg
);
210 memcpy( ptr
, enter_xms
, sizeof(enter_xms
) );
211 ptr
= DOSMEM_GetBlock( sizeof(enter_pm
), &DOSMEM_dpmi_segments
.dpmi_seg
);
212 memcpy( ptr
, enter_pm
, sizeof(enter_pm
) );
213 DOSMEM_dpmi_segments
.dpmi_sel
= SELECTOR_AllocBlock( ptr
, sizeof(enter_pm
), WINE_LDT_FLAGS_CODE
);
215 ptr
= DOSMEM_GetBlock( 6 * 256, &DOSMEM_dpmi_segments
.int48_seg
);
216 for(i
=0; i
<256; i
++) {
218 * Each 32-bit interrupt handler is 6 bytes:
219 * 0xCD,<i> = int <i> (nested 16-bit interrupt)
220 * 0x66,0xCA,0x04,0x00 = ret 4 (32-bit far return and pop 4 bytes)
222 ptr
[i
* 6 + 0] = 0xCD;
224 ptr
[i
* 6 + 2] = 0x66;
225 ptr
[i
* 6 + 3] = 0xCA;
226 ptr
[i
* 6 + 4] = 0x04;
227 ptr
[i
* 6 + 5] = 0x00;
229 DOSMEM_dpmi_segments
.int48_sel
= SELECTOR_AllocBlock( ptr
, 6 * 256, WINE_LDT_FLAGS_CODE
);
232 static BIOSDATA
* DOSMEM_BiosData(void)
234 return (BIOSDATA
*)(DOSMEM_sysmem
+ 0x400);
238 /***********************************************************************
239 * DOSMEM_FillBiosSegments
241 * Fill the BIOS data segment with dummy values.
243 static void DOSMEM_FillBiosSegments(void)
245 BYTE
*pBiosSys
= DOSMEM_dosmem
+ 0xf0000;
246 BYTE
*pBiosROMTable
= pBiosSys
+0xe6f5;
247 BIOS_EXTRA
*extra
= (BIOS_EXTRA
*)(DOSMEM_dosmem
+ (int)BIOS_EXTRA_PTR
);
248 BIOSDATA
*pBiosData
= DOSMEM_BiosData();
250 /* Supported VESA mode, see int10.c */
251 WORD ConstVesaModeList
[]={0x00,0x01,0x02,0x03,0x07,0x0D,0x0E,0x10,0x12,0x13,
252 0x100,0x101,0x102,0x103,0x104,0x105,0x106,0x107,0x10D,0x10E,
253 0x10F,0x110,0x111,0x112,0x113,0x114,0x115,0x116,0x117,0x118,
254 0x119,0x11A,0x11B,0xFFFF};
255 char * ConstVesaString
= "WINE SVGA BOARD";
258 VIDEOFUNCTIONALITY
*pVidFunc
= &extra
->vid_func
;
259 VIDEOSTATE
*pVidState
= &extra
->vid_state
;
260 VESAINFO
*pVesaInfo
= &extra
->vesa_info
;
261 char * VesaString
= extra
->vesa_string
;
262 WORD
* VesaModeList
= extra
->vesa_modes
;
264 /* Clear all unused values */
265 memset( pBiosData
, 0, sizeof(*pBiosData
) );
266 memset( pVidFunc
, 0, sizeof(*pVidFunc
) );
267 memset( pVidState
, 0, sizeof(*pVidState
) );
268 memset( pVesaInfo
, 0, sizeof(*pVesaInfo
) );
270 /* FIXME: should check the number of configured drives and ports */
271 pBiosData
->Com1Addr
= 0x3f8;
272 pBiosData
->Com2Addr
= 0x2f8;
273 pBiosData
->Lpt1Addr
= 0x378;
274 pBiosData
->Lpt2Addr
= 0x278;
275 pBiosData
->InstalledHardware
= 0x5463;
276 pBiosData
->MemSize
= 640;
277 pBiosData
->NextKbdCharPtr
= 0x1e;
278 pBiosData
->FirstKbdCharPtr
= 0x1e;
279 pBiosData
->VideoMode
= 3;
280 pBiosData
->VideoColumns
= 80;
281 pBiosData
->VideoPageSize
= 80 * 25 * 2;
282 pBiosData
->VideoPageStartAddr
= 0xb800;
283 pBiosData
->VideoCtrlAddr
= 0x3d4;
284 pBiosData
->Ticks
= INT1A_GetTicksSinceMidnight();
285 pBiosData
->NbHardDisks
= 2;
286 pBiosData
->KbdBufferStart
= 0x1e;
287 pBiosData
->KbdBufferEnd
= 0x3e;
288 pBiosData
->RowsOnScreenMinus1
= 24;
289 pBiosData
->BytesPerChar
= 0x10;
290 pBiosData
->ModeOptions
= 0x64;
291 pBiosData
->FeatureBitsSwitches
= 0xf9;
292 pBiosData
->VGASettings
= 0x51;
293 pBiosData
->DisplayCombination
= 0x08;
294 pBiosData
->DiskDataRate
= 0;
296 /* fill ROM configuration table (values from Award) */
297 *(pBiosROMTable
+0x0) = 0x08; /* number of bytes following LO */
298 *(pBiosROMTable
+0x1) = 0x00; /* number of bytes following HI */
299 *(pBiosROMTable
+0x2) = 0xfc; /* model */
300 *(pBiosROMTable
+0x3) = 0x01; /* submodel */
301 *(pBiosROMTable
+0x4) = 0x00; /* BIOS revision */
302 *(pBiosROMTable
+0x5) = 0x74; /* feature byte 1 */
303 *(pBiosROMTable
+0x6) = 0x00; /* feature byte 2 */
304 *(pBiosROMTable
+0x7) = 0x00; /* feature byte 3 */
305 *(pBiosROMTable
+0x8) = 0x00; /* feature byte 4 */
306 *(pBiosROMTable
+0x9) = 0x00; /* feature byte 5 */
309 for (i
= 0; i
< 7; i
++)
310 pVidFunc
->ModeSupport
[i
] = 0xff;
312 pVidFunc
->ScanlineSupport
= 7;
313 pVidFunc
->NumberCharBlocks
= 0;
314 pVidFunc
->ActiveCharBlocks
= 0;
315 pVidFunc
->MiscFlags
= 0x8ff;
316 pVidFunc
->SavePointerFlags
= 0x3f;
318 /* FIXME: always real mode ? */
319 pVidState
->StaticFuncTable
= BIOS_EXTRA_SEGPTR
+ offsetof(BIOS_EXTRA
,vid_func
);
320 pVidState
->VideoMode
= pBiosData
->VideoMode
; /* needs updates! */
321 pVidState
->NumberColumns
= pBiosData
->VideoColumns
; /* needs updates! */
322 pVidState
->RegenBufLen
= 0;
323 pVidState
->RegenBufAddr
= 0;
325 for (i
= 0; i
< 8; i
++)
326 pVidState
->CursorPos
[i
] = 0;
328 pVidState
->CursorType
= 0x0a0b; /* start/end line */
329 pVidState
->ActivePage
= 0;
330 pVidState
->CRTCPort
= 0x3da;
331 pVidState
->Port3x8
= 0;
332 pVidState
->Port3x9
= 0;
333 pVidState
->NumberRows
= 23; /* number of rows - 1 */
334 pVidState
->BytesPerChar
= 0x10;
335 pVidState
->DCCActive
= pBiosData
->DisplayCombination
;
336 pVidState
->DCCAlternate
= 0;
337 pVidState
->NumberColors
= 16;
338 pVidState
->NumberPages
= 1;
339 pVidState
->NumberScanlines
= 3; /* (0,1,2,3) = (200,350,400,480) */
340 pVidState
->CharBlockPrimary
= 0;
341 pVidState
->CharBlockSecondary
= 0;
342 pVidState
->MiscFlags
=
343 (pBiosData
->VGASettings
& 0x0f)
344 | ((pBiosData
->ModeOptions
& 1) << 4); /* cursor emulation */
345 pVidState
->NonVGASupport
= 0;
346 pVidState
->VideoMem
= (pBiosData
->ModeOptions
& 0x60 >> 5);
347 pVidState
->SavePointerState
= 0;
348 pVidState
->DisplayStatus
= 4;
350 /* SVGA structures */
351 pVesaInfo
->Signature
= *(DWORD
*)"VESA";
352 pVesaInfo
->Major
= 2;
353 pVesaInfo
->Minor
= 0;
354 /* FIXME: always real mode ? */
355 pVesaInfo
->StaticVendorString
= BIOS_EXTRA_SEGPTR
+ offsetof(BIOS_EXTRA
,vesa_string
);
356 pVesaInfo
->CapabilitiesFlags
= 0xfffffffd; /* FIXME: not really supported */
357 /* FIXME: always real mode ? */
358 pVesaInfo
->StaticModeList
= BIOS_EXTRA_SEGPTR
+ offsetof(BIOS_EXTRA
,vesa_modes
);
360 strcpy(VesaString
,ConstVesaString
);
361 memcpy(VesaModeList
,ConstVesaModeList
,sizeof(ConstVesaModeList
));
363 /* BIOS date string */
364 strcpy((char *)pBiosSys
+0xfff5, "13/01/99");
367 *(pBiosSys
+0xfffe) = 0xfc;
370 /***********************************************************************
371 * DOSMEM_InitCollateTable
373 * Initialises the collate table (character sorting, language dependent)
375 static void DOSMEM_InitCollateTable()
381 x
= GlobalDOSAlloc16(258);
382 DOSMEM_CollateTable
= MAKELONG(0,(x
>>16));
383 tbl
= DOSMEM_MapRealToLinear(DOSMEM_CollateTable
);
386 for ( i
= 0; i
< 0x100; i
++) *tbl
++ = i
;
389 /***********************************************************************
390 * DOSMEM_InitErrorTable
392 * Initialises the error tables (DOS 5+)
394 static void DOSMEM_InitErrorTable()
396 #if 0 /* no longer used */
400 /* We will use a snippet of real mode code that calls */
401 /* a WINE-only interrupt to handle moving the requested */
402 /* message into the buffer... */
404 /* FIXME - There is still something wrong... */
406 /* FIXME - Find hex values for opcodes...
408 (On call, AX contains message number
409 DI contains 'offset' (??)
410 Resturn, ES:DI points to counted string )
414 MOV AX, (arbitrary subfunction number)
415 INT (WINE-only interrupt)
422 const int buffer
= 80;
423 const int SIZE_TO_ALLOCATE
= code
+ buffer
;
425 /* FIXME - Complete rewrite of the table system to save */
426 /* precious DOS space. Now, we return the 0001:???? as */
427 /* DOS 4+ (??, it seems to be the case in MS 7.10) treats that */
428 /* as a special case and programs will use the alternate */
429 /* interface (a farcall returned with INT 24 (AX = 0x122e, DL = */
430 /* 0x08) which lets us have a smaller memory footprint anyway. */
432 x
= GlobalDOSAlloc16(SIZE_TO_ALLOCATE
);
434 DOSMEM_ErrorCall
= MAKELONG(0,(x
>>16));
435 DOSMEM_ErrorBuffer
= DOSMEM_ErrorCall
+ code
;
437 call
= DOSMEM_MapRealToLinear(DOSMEM_ErrorCall
);
439 memset(call
, 0, SIZE_TO_ALLOCATE
);
441 /* FIXME - Copy assembly into buffer here */
444 /***********************************************************************
447 * Initialises the DOS memory structures.
449 static void DOSMEM_InitMemory(void)
451 /* Low 64Kb are reserved for DOS/BIOS so the useable area starts at
452 * 1000:0000 and ends at 9FFF:FFEF. */
454 dosmem_info
* info_block
= DOSMEM_InfoBlock();
455 dosmem_entry
* root_block
= DOSMEM_RootBlock();
458 root_block
->size
= DOSMEM_MemoryTop() - (((char*)root_block
) + sizeof(dosmem_entry
));
460 info_block
->blocks
= 0;
461 info_block
->free
= root_block
->size
;
463 dm
= NEXT_BLOCK(root_block
);
464 dm
->size
= DM_BLOCK_TERMINAL
;
465 root_block
->size
|= DM_BLOCK_FREE
466 #ifdef __DOSMEM_DEBUG__
472 /**********************************************************************
475 * Setup the first megabyte for DOS memory access
477 static void setup_dos_mem( int dos_init
)
480 int page_size
= getpagesize();
481 void *addr
= wine_anon_mmap( (void *)page_size
, 0x110000-page_size
,
482 PROT_READ
| PROT_WRITE
| PROT_EXEC
, 0 );
483 if (addr
== (void *)page_size
) /* we got what we wanted */
485 /* now map from address 0 */
486 addr
= wine_anon_mmap( NULL
, 0x110000, PROT_READ
| PROT_WRITE
| PROT_EXEC
, MAP_FIXED
);
489 ERR("MAP_FIXED failed at address 0 for DOS address space\n" );
493 /* inform the memory manager that there is a mapping here */
494 VirtualAlloc( addr
, 0x110000, MEM_RESERVE
| MEM_SYSTEM
, PAGE_EXECUTE_READWRITE
);
496 /* protect the first 64K to catch NULL pointers */
499 VirtualProtect( addr
, 0x10000, PAGE_NOACCESS
, NULL
);
500 /* move the BIOS and ISR area from 0x00000 to 0xf0000 */
501 sys_offset
+= 0xf0000;
506 ERR("Cannot use first megabyte for DOS address space, please report\n" );
507 if (dos_init
) ExitProcess(1);
508 /* allocate the DOS area somewhere else */
509 addr
= VirtualAlloc( NULL
, 0x110000, MEM_COMMIT
, PAGE_EXECUTE_READWRITE
);
512 ERR( "Cannot allocate DOS memory\n" );
516 DOSMEM_dosmem
= addr
;
517 DOSMEM_sysmem
= (char*)addr
+ sys_offset
;
521 /***********************************************************************
524 * Create the dos memory segments, and store them into the KERNEL
527 BOOL
DOSMEM_Init(BOOL dos_init
)
529 static int already_done
, already_mapped
;
533 setup_dos_mem( dos_init
);
535 DOSMEM_0000H
= GLOBAL_CreateBlock( GMEM_FIXED
, DOSMEM_sysmem
,
536 0x10000, 0, WINE_LDT_FLAGS_DATA
);
537 DOSMEM_BiosDataSeg
= GLOBAL_CreateBlock(GMEM_FIXED
,DOSMEM_sysmem
+ 0x400,
538 0x100, 0, WINE_LDT_FLAGS_DATA
);
539 DOSMEM_BiosSysSeg
= GLOBAL_CreateBlock(GMEM_FIXED
,DOSMEM_dosmem
+0xf0000,
540 0x10000, 0, WINE_LDT_FLAGS_DATA
);
541 DOSMEM_FillBiosSegments();
542 DOSMEM_FillIsrTable();
544 DOSMEM_InitCollateTable();
545 DOSMEM_InitErrorTable();
549 else if (dos_init
&& !already_mapped
)
553 ERR( "Needs access to the first megabyte for DOS mode\n" );
556 MESSAGE( "Warning: unprotecting the first 64KB of memory to allow real-mode calls.\n"
557 " NULL pointer accesses will no longer be caught.\n" );
558 VirtualProtect( NULL
, 0x10000, PAGE_EXECUTE_READWRITE
, NULL
);
559 /* copy the BIOS and ISR area down */
560 memcpy( DOSMEM_dosmem
, DOSMEM_sysmem
, 0x400 + 0x100 );
561 DOSMEM_sysmem
= DOSMEM_dosmem
;
562 SetSelectorBase( DOSMEM_0000H
, 0 );
563 SetSelectorBase( DOSMEM_BiosDataSeg
, 0x400 );
564 /* we may now need the actual interrupt stubs, and since we've just moved the
565 * interrupt vector table away, we can fill the area with stubs instead... */
566 DOSMEM_MakeIsrStubs();
573 /***********************************************************************
576 * Increment the BIOS tick counter. Called by timer signal handler.
578 void DOSMEM_Tick( WORD timer
)
580 BIOSDATA
*pBiosData
= DOSMEM_BiosData();
581 if (pBiosData
) pBiosData
->Ticks
++;
584 /***********************************************************************
587 * Carve a chunk of the DOS memory block (without selector).
589 LPVOID
DOSMEM_GetBlock(UINT size
, UINT16
* pseg
)
593 dosmem_info
*info_block
= DOSMEM_InfoBlock();
595 #ifdef __DOSMEM_DEBUG_
596 dosmem_entry
*prev
= NULL
;
599 if( size
> info_block
->free
) return NULL
;
600 dm
= DOSMEM_RootBlock();
602 while (dm
&& dm
->size
!= DM_BLOCK_TERMINAL
)
604 #ifdef __DOSMEM_DEBUG__
605 if( (dm
->size
& DM_BLOCK_DEBUG
) != DM_BLOCK_DEBUG
)
607 WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT
)prev
);
612 if( dm
->size
& DM_BLOCK_FREE
)
614 dosmem_entry
*next
= NEXT_BLOCK(dm
);
616 while( next
->size
& DM_BLOCK_FREE
) /* collapse free blocks */
618 dm
->size
+= sizeof(dosmem_entry
) + (next
->size
& DM_BLOCK_MASK
);
619 next
->size
= (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
);
620 next
= NEXT_BLOCK(dm
);
623 blocksize
= dm
->size
& DM_BLOCK_MASK
;
624 if( blocksize
>= size
)
626 block
= ((char*)dm
) + sizeof(dosmem_entry
);
627 if( blocksize
- size
> 0x20 )
629 /* split dm so that the next one stays
630 * paragraph-aligned (and dm loses free bit) */
632 dm
->size
= (((size
+ 0xf + sizeof(dosmem_entry
)) & ~0xf) -
633 sizeof(dosmem_entry
));
634 next
= (dosmem_entry
*)(((char*)dm
) +
635 sizeof(dosmem_entry
) + dm
->size
);
636 next
->size
= (blocksize
- (dm
->size
+
637 sizeof(dosmem_entry
))) | DM_BLOCK_FREE
638 #ifdef __DOSMEM_DEBUG__
642 } else dm
->size
&= DM_BLOCK_MASK
;
644 info_block
->blocks
++;
645 info_block
->free
-= dm
->size
;
646 if( pseg
) *pseg
= (block
- DOSMEM_dosmem
) >> 4;
647 #ifdef __DOSMEM_DEBUG__
648 dm
->size
|= DM_BLOCK_DEBUG
;
654 else dm
= NEXT_BLOCK(dm
);
656 return (LPVOID
)block
;
659 /***********************************************************************
662 BOOL
DOSMEM_FreeBlock(void* ptr
)
664 dosmem_info
*info_block
= DOSMEM_InfoBlock();
666 if( ptr
>= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry
)) &&
667 ptr
< (void*)DOSMEM_MemoryTop() && !((((char*)ptr
)
668 - DOSMEM_dosmem
) & 0xf) )
670 dosmem_entry
*dm
= (dosmem_entry
*)(((char*)ptr
) - sizeof(dosmem_entry
));
672 if( !(dm
->size
& (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
))
673 #ifdef __DOSMEM_DEBUG__
674 && ((dm
->size
& DM_BLOCK_DEBUG
) == DM_BLOCK_DEBUG
)
678 info_block
->blocks
--;
679 info_block
->free
+= dm
->size
;
681 dm
->size
|= DM_BLOCK_FREE
;
688 /***********************************************************************
691 LPVOID
DOSMEM_ResizeBlock(void* ptr
, UINT size
, UINT16
* pseg
)
694 dosmem_info
*info_block
= DOSMEM_InfoBlock();
696 if( ptr
>= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry
)) &&
697 ptr
< (void*)DOSMEM_MemoryTop() && !((((char*)ptr
)
698 - DOSMEM_dosmem
) & 0xf) )
700 dosmem_entry
*dm
= (dosmem_entry
*)(((char*)ptr
) - sizeof(dosmem_entry
));
702 if( pseg
) *pseg
= ((char*)ptr
- DOSMEM_dosmem
) >> 4;
704 if( !(dm
->size
& (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
))
707 dosmem_entry
*next
= NEXT_BLOCK(dm
);
708 UINT blocksize
, orgsize
= dm
->size
& DM_BLOCK_MASK
;
710 while( next
->size
& DM_BLOCK_FREE
) /* collapse free blocks */
712 dm
->size
+= sizeof(dosmem_entry
) + (next
->size
& DM_BLOCK_MASK
);
713 next
->size
= (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
);
714 next
= NEXT_BLOCK(dm
);
717 blocksize
= dm
->size
& DM_BLOCK_MASK
;
718 if (blocksize
>= size
)
720 block
= ((char*)dm
) + sizeof(dosmem_entry
);
721 if( blocksize
- size
> 0x20 )
723 /* split dm so that the next one stays
724 * paragraph-aligned (and next gains free bit) */
726 dm
->size
= (((size
+ 0xf + sizeof(dosmem_entry
)) & ~0xf) -
727 sizeof(dosmem_entry
));
728 next
= (dosmem_entry
*)(((char*)dm
) +
729 sizeof(dosmem_entry
) + dm
->size
);
730 next
->size
= (blocksize
- (dm
->size
+
731 sizeof(dosmem_entry
))) | DM_BLOCK_FREE
733 } else dm
->size
&= DM_BLOCK_MASK
;
735 info_block
->free
+= orgsize
- dm
->size
;
737 /* the collapse didn't help, try getting a new block */
738 block
= DOSMEM_GetBlock(size
, pseg
);
740 /* we got one, copy the old data there (we do need to, right?) */
741 memcpy(block
, ((char*)dm
) + sizeof(dosmem_entry
),
742 (size
<orgsize
) ? size
: orgsize
);
744 info_block
->blocks
--;
745 info_block
->free
+= dm
->size
;
747 dm
->size
|= DM_BLOCK_FREE
;
749 /* and Bill Gates said 640K should be enough for everyone... */
751 /* need to split original and collapsed blocks apart again,
752 * and free the collapsed blocks again, before exiting */
753 if( blocksize
- orgsize
> 0x20 )
755 /* split dm so that the next one stays
756 * paragraph-aligned (and next gains free bit) */
758 dm
->size
= (((orgsize
+ 0xf + sizeof(dosmem_entry
)) & ~0xf) -
759 sizeof(dosmem_entry
));
760 next
= (dosmem_entry
*)(((char*)dm
) +
761 sizeof(dosmem_entry
) + dm
->size
);
762 next
->size
= (blocksize
- (dm
->size
+
763 sizeof(dosmem_entry
))) | DM_BLOCK_FREE
765 } else dm
->size
&= DM_BLOCK_MASK
;
770 return (LPVOID
)block
;
774 /***********************************************************************
777 UINT
DOSMEM_Available(void)
779 UINT blocksize
, available
= 0;
782 dm
= DOSMEM_RootBlock();
784 while (dm
&& dm
->size
!= DM_BLOCK_TERMINAL
)
786 #ifdef __DOSMEM_DEBUG__
787 if( (dm
->size
& DM_BLOCK_DEBUG
) != DM_BLOCK_DEBUG
)
789 WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT
)prev
);
794 if( dm
->size
& DM_BLOCK_FREE
)
796 dosmem_entry
*next
= NEXT_BLOCK(dm
);
798 while( next
->size
& DM_BLOCK_FREE
) /* collapse free blocks */
800 dm
->size
+= sizeof(dosmem_entry
) + (next
->size
& DM_BLOCK_MASK
);
801 next
->size
= (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
);
802 next
= NEXT_BLOCK(dm
);
805 blocksize
= dm
->size
& DM_BLOCK_MASK
;
806 if ( blocksize
> available
) available
= blocksize
;
809 else dm
= NEXT_BLOCK(dm
);
815 /***********************************************************************
816 * DOSMEM_MapLinearToDos
818 * Linear address to the DOS address space.
820 UINT
DOSMEM_MapLinearToDos(LPVOID ptr
)
822 if (((char*)ptr
>= DOSMEM_dosmem
) &&
823 ((char*)ptr
< DOSMEM_dosmem
+ 0x100000))
824 return (UINT
)ptr
- (UINT
)DOSMEM_dosmem
;
829 /***********************************************************************
830 * DOSMEM_MapDosToLinear
832 * DOS linear address to the linear address space.
834 LPVOID
DOSMEM_MapDosToLinear(UINT ptr
)
836 if (ptr
< 0x100000) return (LPVOID
)(ptr
+ (UINT
)DOSMEM_dosmem
);
841 /***********************************************************************
842 * DOSMEM_MapRealToLinear
844 * Real mode DOS address into a linear pointer
846 LPVOID
DOSMEM_MapRealToLinear(DWORD x
)
850 lin
=DOSMEM_dosmem
+(x
&0xffff)+(((x
&0xffff0000)>>16)*16);
851 TRACE_(selector
)("(0x%08lx) returns %p.\n", x
, lin
);
855 /***********************************************************************
856 * DOSMEM_AllocSelector
858 * Allocates a protected mode selector for a realmode segment.
860 WORD
DOSMEM_AllocSelector(WORD realsel
)
862 HMODULE16 hModule
= GetModuleHandle16("KERNEL");
865 sel
=GLOBAL_CreateBlock( GMEM_FIXED
, DOSMEM_dosmem
+realsel
*16, 0x10000,
866 hModule
, WINE_LDT_FLAGS_DATA
);
867 TRACE_(selector
)("(0x%04x) returns 0x%04x.\n", realsel
,sel
);