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"
29 #include <sys/types.h>
30 #ifdef HAVE_SYS_MMAN_H
31 # include <sys/mman.h>
35 #ifdef HAVE_SYS_TIME_H
36 # include <sys/time.h>
41 #include "wine/winbase16.h"
43 #include "kernel_private.h"
46 #include "wine/debug.h"
48 WINE_DEFAULT_DEBUG_CHANNEL(dosmem
);
49 WINE_DECLARE_DEBUG_CHANNEL(selector
);
51 WORD DOSMEM_0000H
; /* segment at 0:0 */
52 WORD DOSMEM_BiosDataSeg
; /* BIOS data segment at 0x40:0 */
53 WORD DOSMEM_BiosSysSeg
; /* BIOS ROM segment at 0xf000:0 */
55 /* use 2 low bits of 'size' for the housekeeping */
57 #define DM_BLOCK_DEBUG 0xABE00000
58 #define DM_BLOCK_TERMINAL 0x00000001
59 #define DM_BLOCK_FREE 0x00000002
60 #define DM_BLOCK_MASK 0x001FFFFC
63 #define __DOSMEM_DEBUG__
75 #define NEXT_BLOCK(block) \
76 (dosmem_entry*)(((char*)(block)) + \
77 sizeof(dosmem_entry) + ((block)->size & DM_BLOCK_MASK))
79 #define VM_STUB(x) (0x90CF00CD|(x<<8)) /* INT x; IRET; NOP */
80 #define VM_STUB_SEGMENT 0xf000 /* BIOS segment */
83 static char *DOSMEM_dosmem
;
84 /* DOS system base (for interrupt vector table and BIOS data area)
85 * ...should in theory (i.e. Windows) be equal to DOSMEM_dosmem (NULL),
86 * but is normally set to 0xf0000 in Wine to allow trapping of NULL pointers,
87 * and only relocated to NULL when absolutely necessary */
88 static char *DOSMEM_sysmem
;
90 /* Start of DOS conventional memory */
91 static char *DOSMEM_membase
;
93 static void DOSMEM_InitMemory(void);
95 /***********************************************************************
98 * Gets the DOS memory top.
100 static char *DOSMEM_MemoryTop(void)
102 return DOSMEM_dosmem
+0x9FFFC; /* 640K */
105 /***********************************************************************
108 * Gets the DOS memory info block.
110 static dosmem_info
*DOSMEM_InfoBlock(void)
118 * - lowest 64k for NULL pointer catching (Win16)
119 * - lowest 1k for interrupt handlers and
120 * another 0.5k for BIOS, DOS and intra-application
123 if (DOSMEM_dosmem
!= DOSMEM_sysmem
)
124 reserve
= 0x10000; /* 64k */
126 reserve
= 0x600; /* 1.5k */
129 * Round to paragraph boundary in order to make
130 * sure the alignment is correct.
132 reserve
= ((reserve
+ 15) >> 4) << 4;
135 * Set DOS memory base and initialize conventional memory.
137 DOSMEM_membase
= DOSMEM_dosmem
+ reserve
;
141 return (dosmem_info
*)DOSMEM_membase
;
144 /***********************************************************************
147 * Gets the DOS memory root block.
149 static dosmem_entry
*DOSMEM_RootBlock(void)
151 /* first block has to be paragraph-aligned */
152 return (dosmem_entry
*)(((char*)DOSMEM_InfoBlock()) +
153 ((((sizeof(dosmem_info
) + 0xf) & ~0xf) - sizeof(dosmem_entry
))));
156 /***********************************************************************
157 * DOSMEM_FillIsrTable
159 * Fill the interrupt table with fake BIOS calls to BIOSSEG (0xf000).
162 * Linux normally only traps INTs performed from or destined to BIOSSEG
163 * for us to handle, if the int_revectored table is empty. Filling the
164 * interrupt table with calls to INT stubs in BIOSSEG allows DOS programs
165 * to hook interrupts, as well as use their familiar retf tricks to call
166 * them, AND let Wine handle any unhooked interrupts transparently.
168 static void DOSMEM_FillIsrTable(void)
170 SEGPTR
*isr
= (SEGPTR
*)DOSMEM_sysmem
;
173 for (x
=0; x
<256; x
++) isr
[x
]=MAKESEGPTR(VM_STUB_SEGMENT
,x
*4);
176 static void DOSMEM_MakeIsrStubs(void)
178 DWORD
*stub
= (DWORD
*)(DOSMEM_dosmem
+ (VM_STUB_SEGMENT
<< 4));
181 for (x
=0; x
<256; x
++) stub
[x
]=VM_STUB(x
);
184 static BIOSDATA
* DOSMEM_BiosData(void)
186 return (BIOSDATA
*)(DOSMEM_sysmem
+ 0x400);
189 /**********************************************************************
190 * DOSMEM_GetTicksSinceMidnight
192 * Return number of clock ticks since midnight.
194 static DWORD
DOSMEM_GetTicksSinceMidnight(void)
200 /* This should give us the (approximately) correct
201 * 18.206 clock ticks per second since midnight.
203 gettimeofday( &tvs
, NULL
);
204 seconds
= tvs
.tv_sec
;
205 bdtime
= localtime( &seconds
);
206 return (((bdtime
->tm_hour
* 3600 + bdtime
->tm_min
* 60 +
207 bdtime
->tm_sec
) * 18206) / 1000) +
208 (tvs
.tv_usec
/ 54927);
211 /***********************************************************************
212 * DOSMEM_FillBiosSegments
214 * Fill the BIOS data segment with dummy values.
216 static void DOSMEM_FillBiosSegments(void)
218 char *pBiosSys
= DOSMEM_dosmem
+ 0xf0000;
219 BYTE
*pBiosROMTable
= pBiosSys
+0xe6f5;
220 BIOSDATA
*pBiosData
= DOSMEM_BiosData();
222 /* Clear all unused values */
223 memset( pBiosData
, 0, sizeof(*pBiosData
) );
225 /* FIXME: should check the number of configured drives and ports */
226 pBiosData
->Com1Addr
= 0x3f8;
227 pBiosData
->Com2Addr
= 0x2f8;
228 pBiosData
->Lpt1Addr
= 0x378;
229 pBiosData
->Lpt2Addr
= 0x278;
230 pBiosData
->InstalledHardware
= 0x5463;
231 pBiosData
->MemSize
= 640;
232 pBiosData
->NextKbdCharPtr
= 0x1e;
233 pBiosData
->FirstKbdCharPtr
= 0x1e;
234 pBiosData
->VideoMode
= 3;
235 pBiosData
->VideoColumns
= 80;
236 pBiosData
->VideoPageSize
= 80 * 25 * 2;
237 pBiosData
->VideoPageStartAddr
= 0xb800;
238 pBiosData
->VideoCtrlAddr
= 0x3d4;
239 pBiosData
->Ticks
= DOSMEM_GetTicksSinceMidnight();
240 pBiosData
->NbHardDisks
= 2;
241 pBiosData
->KbdBufferStart
= 0x1e;
242 pBiosData
->KbdBufferEnd
= 0x3e;
243 pBiosData
->RowsOnScreenMinus1
= 24;
244 pBiosData
->BytesPerChar
= 0x10;
245 pBiosData
->ModeOptions
= 0x64;
246 pBiosData
->FeatureBitsSwitches
= 0xf9;
247 pBiosData
->VGASettings
= 0x51;
248 pBiosData
->DisplayCombination
= 0x08;
249 pBiosData
->DiskDataRate
= 0;
251 /* fill ROM configuration table (values from Award) */
252 *(pBiosROMTable
+0x0) = 0x08; /* number of bytes following LO */
253 *(pBiosROMTable
+0x1) = 0x00; /* number of bytes following HI */
254 *(pBiosROMTable
+0x2) = 0xfc; /* model */
255 *(pBiosROMTable
+0x3) = 0x01; /* submodel */
256 *(pBiosROMTable
+0x4) = 0x00; /* BIOS revision */
257 *(pBiosROMTable
+0x5) = 0x74; /* feature byte 1 */
258 *(pBiosROMTable
+0x6) = 0x00; /* feature byte 2 */
259 *(pBiosROMTable
+0x7) = 0x00; /* feature byte 3 */
260 *(pBiosROMTable
+0x8) = 0x00; /* feature byte 4 */
261 *(pBiosROMTable
+0x9) = 0x00; /* feature byte 5 */
263 /* BIOS date string */
264 strcpy(pBiosSys
+0xfff5, "13/01/99");
267 *(pBiosSys
+0xfffe) = 0xfc;
269 /* Reboot vector (f000:fff0 or ffff:0000) */
270 *(DWORD
*)(pBiosSys
+ 0xfff0) = VM_STUB(0x19);
273 /***********************************************************************
276 * Initialises the DOS memory structures.
278 static void DOSMEM_InitMemory(void)
280 dosmem_info
* info_block
= DOSMEM_InfoBlock();
281 dosmem_entry
* root_block
= DOSMEM_RootBlock();
284 root_block
->size
= DOSMEM_MemoryTop() - (((char*)root_block
) + sizeof(dosmem_entry
));
286 info_block
->blocks
= 0;
287 info_block
->free
= root_block
->size
;
289 dm
= NEXT_BLOCK(root_block
);
290 dm
->size
= DM_BLOCK_TERMINAL
;
291 root_block
->size
|= DM_BLOCK_FREE
292 #ifdef __DOSMEM_DEBUG__
297 TRACE( "DOS conventional memory initialized, %d bytes free.\n",
298 DOSMEM_Available() );
302 /**********************************************************************
305 * Setup the first megabyte for DOS memory access
307 static void setup_dos_mem( int dos_init
)
310 int page_size
= getpagesize();
313 if (wine_mmap_is_in_reserved_area( NULL
, 0x110000 ) != 1)
315 addr
= wine_anon_mmap( (void *)page_size
, 0x110000-page_size
,
316 PROT_READ
| PROT_WRITE
| PROT_EXEC
, 0 );
317 if (addr
== (void *)page_size
) addr
= NULL
; /* we got what we wanted */
318 else munmap( addr
, 0x110000 - page_size
);
323 /* now map from address 0 */
324 wine_anon_mmap( NULL
, 0x110000, PROT_READ
| PROT_WRITE
| PROT_EXEC
, MAP_FIXED
);
326 /* inform the memory manager that there is a mapping here */
327 VirtualAlloc( addr
, 0x110000, MEM_RESERVE
| MEM_SYSTEM
, PAGE_EXECUTE_READWRITE
);
329 /* protect the first 64K to catch NULL pointers */
332 VirtualProtect( addr
, 0x10000, PAGE_NOACCESS
, NULL
);
333 /* move the BIOS and ISR area from 0x00000 to 0xf0000 */
334 sys_offset
+= 0xf0000;
339 ERR("Cannot use first megabyte for DOS address space, please report\n" );
340 if (dos_init
) ExitProcess(1);
341 /* allocate the DOS area somewhere else */
342 addr
= VirtualAlloc( NULL
, 0x110000, MEM_COMMIT
, PAGE_EXECUTE_READWRITE
);
345 ERR( "Cannot allocate DOS memory\n" );
349 DOSMEM_dosmem
= addr
;
350 DOSMEM_sysmem
= (char*)addr
+ sys_offset
;
354 /***********************************************************************
357 * Create the dos memory segments, and store them into the KERNEL
360 BOOL
DOSMEM_Init(BOOL dos_init
)
362 static int already_done
, already_mapped
;
366 setup_dos_mem( dos_init
);
368 DOSMEM_0000H
= GLOBAL_CreateBlock( GMEM_FIXED
, DOSMEM_sysmem
,
369 0x10000, 0, WINE_LDT_FLAGS_DATA
);
370 DOSMEM_BiosDataSeg
= GLOBAL_CreateBlock(GMEM_FIXED
,DOSMEM_sysmem
+ 0x400,
371 0x100, 0, WINE_LDT_FLAGS_DATA
);
372 DOSMEM_BiosSysSeg
= GLOBAL_CreateBlock(GMEM_FIXED
,DOSMEM_dosmem
+0xf0000,
373 0x10000, 0, WINE_LDT_FLAGS_DATA
);
374 DOSMEM_FillBiosSegments();
375 DOSMEM_FillIsrTable();
378 else if (dos_init
&& !already_mapped
)
382 ERR( "Needs access to the first megabyte for DOS mode\n" );
385 MESSAGE( "Warning: unprotecting the first 64KB of memory to allow real-mode calls.\n"
386 " NULL pointer accesses will no longer be caught.\n" );
387 VirtualProtect( NULL
, 0x10000, PAGE_EXECUTE_READWRITE
, NULL
);
388 /* copy the BIOS and ISR area down */
389 memcpy( DOSMEM_dosmem
, DOSMEM_sysmem
, 0x400 + 0x100 );
390 DOSMEM_sysmem
= DOSMEM_dosmem
;
391 SetSelectorBase( DOSMEM_0000H
, 0 );
392 SetSelectorBase( DOSMEM_BiosDataSeg
, 0x400 );
393 /* we may now need the actual interrupt stubs, and since we've just moved the
394 * interrupt vector table away, we can fill the area with stubs instead... */
395 DOSMEM_MakeIsrStubs();
402 /***********************************************************************
405 * Increment the BIOS tick counter. Called by timer signal handler.
407 void DOSMEM_Tick( WORD timer
)
409 BIOSDATA
*pBiosData
= DOSMEM_BiosData();
410 if (pBiosData
) pBiosData
->Ticks
++;
413 /***********************************************************************
416 * Carve a chunk of the DOS memory block (without selector).
418 LPVOID
DOSMEM_GetBlock(UINT size
, UINT16
* pseg
)
422 dosmem_info
*info_block
= DOSMEM_InfoBlock();
424 #ifdef __DOSMEM_DEBUG_
425 dosmem_entry
*prev
= NULL
;
428 if( size
> info_block
->free
) return NULL
;
429 dm
= DOSMEM_RootBlock();
431 while (dm
&& dm
->size
!= DM_BLOCK_TERMINAL
)
433 #ifdef __DOSMEM_DEBUG__
434 if( (dm
->size
& DM_BLOCK_DEBUG
) != DM_BLOCK_DEBUG
)
436 WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT
)prev
);
441 if( dm
->size
& DM_BLOCK_FREE
)
443 dosmem_entry
*next
= NEXT_BLOCK(dm
);
445 while( next
->size
& DM_BLOCK_FREE
) /* collapse free blocks */
447 dm
->size
+= sizeof(dosmem_entry
) + (next
->size
& DM_BLOCK_MASK
);
448 next
->size
= (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
);
449 next
= NEXT_BLOCK(dm
);
452 blocksize
= dm
->size
& DM_BLOCK_MASK
;
453 if( blocksize
>= size
)
455 block
= ((char*)dm
) + sizeof(dosmem_entry
);
456 if( blocksize
- size
> 0x20 )
458 /* split dm so that the next one stays
459 * paragraph-aligned (and dm loses free bit) */
461 dm
->size
= (((size
+ 0xf + sizeof(dosmem_entry
)) & ~0xf) -
462 sizeof(dosmem_entry
));
463 next
= (dosmem_entry
*)(((char*)dm
) +
464 sizeof(dosmem_entry
) + dm
->size
);
465 next
->size
= (blocksize
- (dm
->size
+
466 sizeof(dosmem_entry
))) | DM_BLOCK_FREE
467 #ifdef __DOSMEM_DEBUG__
471 } else dm
->size
&= DM_BLOCK_MASK
;
473 info_block
->blocks
++;
474 info_block
->free
-= dm
->size
;
475 if( pseg
) *pseg
= (block
- DOSMEM_dosmem
) >> 4;
476 #ifdef __DOSMEM_DEBUG__
477 dm
->size
|= DM_BLOCK_DEBUG
;
483 else dm
= NEXT_BLOCK(dm
);
485 return (LPVOID
)block
;
488 /***********************************************************************
491 BOOL
DOSMEM_FreeBlock(void* ptr
)
493 dosmem_info
*info_block
= DOSMEM_InfoBlock();
495 if( ptr
>= (void*)(((char*)DOSMEM_RootBlock()) + sizeof(dosmem_entry
)) &&
496 ptr
< (void*)DOSMEM_MemoryTop() && !((((char*)ptr
)
497 - DOSMEM_dosmem
) & 0xf) )
499 dosmem_entry
*dm
= (dosmem_entry
*)(((char*)ptr
) - sizeof(dosmem_entry
));
501 if( !(dm
->size
& (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
))
502 #ifdef __DOSMEM_DEBUG__
503 && ((dm
->size
& DM_BLOCK_DEBUG
) == DM_BLOCK_DEBUG
)
507 info_block
->blocks
--;
508 info_block
->free
+= dm
->size
;
510 dm
->size
|= DM_BLOCK_FREE
;
517 /***********************************************************************
520 * Resize DOS memory block in place. Returns block size or -1 on error.
522 * If exact is TRUE, returned value is either old or requested block
523 * size. If exact is FALSE, block is expanded even if there is not
524 * enough space for full requested block size.
526 UINT
DOSMEM_ResizeBlock(void *ptr
, UINT size
, BOOL exact
)
529 dosmem_info
*info_block
= DOSMEM_InfoBlock();
535 if( (ptr
< (void*)(sizeof(dosmem_entry
) + (char*)DOSMEM_RootBlock())) ||
536 (ptr
>= (void*)DOSMEM_MemoryTop()) ||
537 (((((char*)ptr
) - DOSMEM_dosmem
) & 0xf) != 0) )
540 dm
= (dosmem_entry
*)(((char*)ptr
) - sizeof(dosmem_entry
));
541 if( dm
->size
& (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
) )
544 next
= NEXT_BLOCK(dm
);
545 orgsize
= dm
->size
& DM_BLOCK_MASK
;
547 /* collapse free blocks */
548 while( next
->size
& DM_BLOCK_FREE
)
550 dm
->size
+= sizeof(dosmem_entry
) + (next
->size
& DM_BLOCK_MASK
);
551 next
->size
= (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
);
552 next
= NEXT_BLOCK(dm
);
555 blocksize
= dm
->size
& DM_BLOCK_MASK
;
558 * If collapse didn't help we either expand block to maximum
559 * available size (exact == FALSE) or give collapsed blocks
560 * back to free storage (exact == TRUE).
562 if (blocksize
< size
)
563 size
= exact
? orgsize
: blocksize
;
565 block
= ((char*)dm
) + sizeof(dosmem_entry
);
566 if( blocksize
- size
> 0x20 )
569 * split dm so that the next one stays
570 * paragraph-aligned (and next gains free bit)
573 dm
->size
= (((size
+ 0xf + sizeof(dosmem_entry
)) & ~0xf) -
574 sizeof(dosmem_entry
));
575 next
= (dosmem_entry
*)(((char*)dm
) +
576 sizeof(dosmem_entry
) + dm
->size
);
577 next
->size
= (blocksize
- (dm
->size
+
578 sizeof(dosmem_entry
))) | DM_BLOCK_FREE
;
582 dm
->size
&= DM_BLOCK_MASK
;
586 * Adjust available memory if block size changes.
588 info_block
->free
+= orgsize
- dm
->size
;
593 /***********************************************************************
596 UINT
DOSMEM_Available(void)
598 UINT blocksize
, available
= 0;
601 dm
= DOSMEM_RootBlock();
603 while (dm
&& dm
->size
!= DM_BLOCK_TERMINAL
)
605 #ifdef __DOSMEM_DEBUG__
606 if( (dm
->size
& DM_BLOCK_DEBUG
) != DM_BLOCK_DEBUG
)
608 WARN("MCB overrun! [prev = 0x%08x]\n", 4 + (UINT
)prev
);
613 if( dm
->size
& DM_BLOCK_FREE
)
615 dosmem_entry
*next
= NEXT_BLOCK(dm
);
617 while( next
->size
& DM_BLOCK_FREE
) /* collapse free blocks */
619 dm
->size
+= sizeof(dosmem_entry
) + (next
->size
& DM_BLOCK_MASK
);
620 next
->size
= (DM_BLOCK_FREE
| DM_BLOCK_TERMINAL
);
621 next
= NEXT_BLOCK(dm
);
624 blocksize
= dm
->size
& DM_BLOCK_MASK
;
625 if ( blocksize
> available
) available
= blocksize
;
628 else dm
= NEXT_BLOCK(dm
);
634 /***********************************************************************
635 * DOSMEM_MapLinearToDos
637 * Linear address to the DOS address space.
639 UINT
DOSMEM_MapLinearToDos(LPVOID ptr
)
641 if (((char*)ptr
>= DOSMEM_dosmem
) &&
642 ((char*)ptr
< DOSMEM_dosmem
+ 0x100000))
643 return (UINT
)ptr
- (UINT
)DOSMEM_dosmem
;
648 /***********************************************************************
649 * DOSMEM_MapDosToLinear
651 * DOS linear address to the linear address space.
653 LPVOID
DOSMEM_MapDosToLinear(UINT ptr
)
655 if (ptr
< 0x100000) return (LPVOID
)(ptr
+ (UINT
)DOSMEM_dosmem
);
660 /***********************************************************************
661 * DOSMEM_MapRealToLinear
663 * Real mode DOS address into a linear pointer
665 LPVOID
DOSMEM_MapRealToLinear(DWORD x
)
669 lin
=DOSMEM_dosmem
+(x
&0xffff)+(((x
&0xffff0000)>>16)*16);
670 TRACE_(selector
)("(0x%08lx) returns %p.\n", x
, lin
);
674 /***********************************************************************
675 * DOSMEM_AllocSelector
677 * Allocates a protected mode selector for a realmode segment.
679 WORD
DOSMEM_AllocSelector(WORD realsel
)
681 HMODULE16 hModule
= GetModuleHandle16("KERNEL");
684 sel
=GLOBAL_CreateBlock( GMEM_FIXED
, DOSMEM_dosmem
+realsel
*16, 0x10000,
685 hModule
, WINE_LDT_FLAGS_DATA
);
686 TRACE_(selector
)("(0x%04x) returns 0x%04x.\n", realsel
,sel
);