dlls/kernel/global16.c

   1 /*
   2  * Global heap functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 /* 0xffff sometimes seems to mean: CURRENT_DS */
  21
  22 #include "config.h"
  23 #include "wine/port.h"
  24
  25 #include <sys/types.h>
  26 #include <stdlib.h>
  27 #include <time.h>
  28 #include <stdio.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32 #include <string.h>
  33 #ifdef HAVE_SYS_PARAM_H
  34 #include <sys/param.h>
  35 #endif
  36 #ifdef HAVE_SYS_SYSCTL_H
  37 #include <sys/sysctl.h>
  38 #endif
  39
  40 #include "wine/winbase16.h"
  41 #include "ntstatus.h"
  42 #include "toolhelp.h"
  43 #include "miscemu.h"
  44 #include "stackframe.h"
  45 #include "kernel_private.h"
  46 #include "wine/debug.h"
  47 #include "winerror.h"
  48
  49 WINE_DEFAULT_DEBUG_CHANNEL(global);
  50
  51   /* Global arena block */
  52 typedef struct
  53 {
  54     DWORD     base;          /* Base address (0 if discarded) */
  55     DWORD     size;          /* Size in bytes (0 indicates a free block) */
  56     HGLOBAL16 handle;        /* Handle for this block */
  57     HGLOBAL16 hOwner;        /* Owner of this block */
  58     BYTE      lockCount;     /* Count of GlobalFix() calls */
  59     BYTE      pageLockCount; /* Count of GlobalPageLock() calls */
  60     BYTE      flags;         /* Allocation flags */
  61     BYTE      selCount;      /* Number of selectors allocated for this block */
  62 } GLOBALARENA;
  63
  64   /* Flags definitions */
  65 #define GA_MOVEABLE     0x02  /* same as GMEM_MOVEABLE */
  66 #define GA_DGROUP       0x04
  67 #define GA_DISCARDABLE  0x08
  68 #define GA_IPCSHARE     0x10  /* same as GMEM_DDESHARE */
  69 #define GA_DOSMEM       0x20
  70
  71 /* Arena array (FIXME) */
  72 static GLOBALARENA *pGlobalArena;
  73 static int globalArenaSize;
  74
  75 #define GLOBAL_MAX_ALLOC_SIZE 0x00ff0000  /* Largest allocation is 16M - 64K */
  76
  77 #define VALID_HANDLE(handle) (((handle)>>__AHSHIFT)<globalArenaSize)
  78 #define GET_ARENA_PTR(handle)  (pGlobalArena + ((handle) >> __AHSHIFT))
  79
  80
  81 /***********************************************************************
  82  *           GLOBAL_GetArena
  83  *
  84  * Return the arena for a given selector, growing the arena array if needed.
  85  */
  86 static GLOBALARENA *GLOBAL_GetArena( WORD sel, WORD selcount )
  87 {
  88     if (((sel >> __AHSHIFT) + selcount) > globalArenaSize)
  89     {
  90         int newsize = ((sel >> __AHSHIFT) + selcount + 0xff) & ~0xff;
  91         GLOBALARENA *pNewArena = realloc( pGlobalArena,
  92                                           newsize * sizeof(GLOBALARENA) );
  93         if (!pNewArena) return 0;
  94         pGlobalArena = pNewArena;
  95         memset( pGlobalArena + globalArenaSize, 0,
  96                 (newsize - globalArenaSize) * sizeof(GLOBALARENA) );
  97         globalArenaSize = newsize;
  98     }
  99     return pGlobalArena + (sel >> __AHSHIFT);
 100 }
 101
 102 void debug_handles(void)
 103 {
 104     int printed=0;
 105     int i;
 106     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 107         if (pGlobalArena[i].size!=0 && (pGlobalArena[i].handle & 0x8000)){
 108             printed=1;
 109             DPRINTF("0x%08x, ",pGlobalArena[i].handle);
 110         }
 111     }
 112     if (printed)
 113         DPRINTF("\n");
 114 }
 115
 116
 117 /***********************************************************************
 118  *           GLOBAL_CreateBlock
 119  *
 120  * Create a global heap block for a fixed range of linear memory.
 121  */
 122 HGLOBAL16 GLOBAL_CreateBlock( WORD flags, const void *ptr, DWORD size,
 123                               HGLOBAL16 hOwner, unsigned char selflags )
 124 {
 125     WORD sel, selcount;
 126     GLOBALARENA *pArena;
 127
 128       /* Allocate the selector(s) */
 129
 130     sel = SELECTOR_AllocBlock( ptr, size, selflags );
 131     if (!sel) return 0;
 132     selcount = (size + 0xffff) / 0x10000;
 133
 134     if (!(pArena = GLOBAL_GetArena( sel, selcount )))
 135     {
 136         SELECTOR_FreeBlock( sel );
 137         return 0;
 138     }
 139
 140       /* Fill the arena block */
 141
 142     pArena->base = (DWORD)ptr;
 143     pArena->size = GetSelectorLimit16(sel) + 1;
 144     pArena->handle = (flags & GMEM_MOVEABLE) ? sel - 1 : sel;
 145     pArena->hOwner = hOwner;
 146     pArena->lockCount = 0;
 147     pArena->pageLockCount = 0;
 148     pArena->flags = flags & GA_MOVEABLE;
 149     if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 150     if (flags & GMEM_DDESHARE) pArena->flags |= GA_IPCSHARE;
 151     if (!(selflags & (WINE_LDT_FLAGS_CODE^WINE_LDT_FLAGS_DATA))) pArena->flags |= GA_DGROUP;
 152     pArena->selCount = selcount;
 153     if (selcount > 1)  /* clear the next arena blocks */
 154         memset( pArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 155
 156     return pArena->handle;
 157 }
 158
 159
 160 /***********************************************************************
 161  *           GLOBAL_FreeBlock
 162  *
 163  * Free a block allocated by GLOBAL_CreateBlock, without touching
 164  * the associated linear memory range.
 165  */
 166 BOOL16 GLOBAL_FreeBlock( HGLOBAL16 handle )
 167 {
 168     WORD sel;
 169     GLOBALARENA *pArena;
 170
 171     if (!handle) return TRUE;
 172     sel = GlobalHandleToSel16( handle );
 173     if (!VALID_HANDLE(sel)) return FALSE;
 174     pArena = GET_ARENA_PTR(sel);
 175     SELECTOR_FreeBlock( sel );
 176     memset( pArena, 0, sizeof(GLOBALARENA) );
 177     return TRUE;
 178 }
 179
 180 /***********************************************************************
 181  *           GLOBAL_MoveBlock
 182  */
 183 BOOL16 GLOBAL_MoveBlock( HGLOBAL16 handle, const void *ptr, DWORD size )
 184 {
 185     WORD sel;
 186     GLOBALARENA *pArena;
 187
 188     if (!handle) return TRUE;
 189     sel = GlobalHandleToSel16( handle );
 190     if (!VALID_HANDLE(sel)) return FALSE;
 191     pArena = GET_ARENA_PTR(sel);
 192     if (pArena->selCount != 1)
 193         return FALSE;
 194
 195     pArena->base = (DWORD)ptr;
 196     pArena->size = size;
 197     SELECTOR_ReallocBlock( sel, ptr, size );
 198     return TRUE;
 199 }
 200
 201 /***********************************************************************
 202  *           GLOBAL_Alloc
 203  *
 204  * Implementation of GlobalAlloc16()
 205  */
 206 HGLOBAL16 GLOBAL_Alloc( UINT16 flags, DWORD size, HGLOBAL16 hOwner, unsigned char selflags )
 207 {
 208     void *ptr;
 209     HGLOBAL16 handle;
 210
 211     TRACE("%ld flags=%04x\n", size, flags );
 212
 213     /* If size is 0, create a discarded block */
 214
 215     if (size == 0) return GLOBAL_CreateBlock( flags, NULL, 1, hOwner, selflags );
 216
 217     /* Fixup the size */
 218
 219     if (size >= GLOBAL_MAX_ALLOC_SIZE - 0x1f) return 0;
 220     size = (size + 0x1f) & ~0x1f;
 221
 222     /* Allocate the linear memory */
 223     ptr = HeapAlloc( GetProcessHeap(), 0, size );
 224       /* FIXME: free discardable blocks and try again? */
 225     if (!ptr) return 0;
 226
 227       /* Allocate the selector(s) */
 228
 229     handle = GLOBAL_CreateBlock( flags, ptr, size, hOwner, selflags );
 230     if (!handle)
 231     {
 232         HeapFree( GetProcessHeap(), 0, ptr );
 233         return 0;
 234     }
 235
 236     if (flags & GMEM_ZEROINIT) memset( ptr, 0, size );
 237     return handle;
 238 }
 239
 240 /***********************************************************************
 241  *           GlobalAlloc     (KERNEL.15)
 242  *           GlobalAlloc16   (KERNEL32.24)
 243  * RETURNS
 244  *      Handle: Success
 245  *      NULL: Failure
 246  */
 247 HGLOBAL16 WINAPI GlobalAlloc16(
 248                  UINT16 flags, /* [in] Object allocation attributes */
 249                  DWORD size    /* [in] Number of bytes to allocate */
 250 ) {
 251     HANDLE16 owner = GetCurrentPDB16();
 252
 253     if (flags & GMEM_DDESHARE)
 254         owner = GetExePtr(owner);  /* Make it a module handle */
 255     return GLOBAL_Alloc( flags, size, owner, WINE_LDT_FLAGS_DATA );
 256 }
 257
 258
 259 /***********************************************************************
 260  *           GlobalReAlloc     (KERNEL.16)
 261  * RETURNS
 262  *      Handle: Success
 263  *      NULL: Failure
 264  */
 265 HGLOBAL16 WINAPI GlobalReAlloc16(
 266                  HGLOBAL16 handle, /* [in] Handle of global memory object */
 267                  DWORD size,       /* [in] New size of block */
 268                  UINT16 flags      /* [in] How to reallocate object */
 269 ) {
 270     WORD selcount;
 271     DWORD oldsize;
 272     void *ptr, *newptr;
 273     GLOBALARENA *pArena, *pNewArena;
 274     WORD sel = GlobalHandleToSel16( handle );
 275
 276     TRACE("%04x %ld flags=%04x\n",
 277                     handle, size, flags );
 278     if (!handle) return 0;
 279
 280     if (!VALID_HANDLE(handle))
 281     {
 282         WARN("Invalid handle 0x%04x!\n", handle);
 283         return 0;
 284     }
 285     pArena = GET_ARENA_PTR( handle );
 286
 287       /* Discard the block if requested */
 288
 289     if ((size == 0) && (flags & GMEM_MOVEABLE) && !(flags & GMEM_MODIFY))
 290     {
 291         if (!(pArena->flags & GA_MOVEABLE) ||
 292             !(pArena->flags & GA_DISCARDABLE) ||
 293             (pArena->lockCount > 0) || (pArena->pageLockCount > 0)) return 0;
 294         if (pArena->flags & GA_DOSMEM)
 295             DOSMEM_FreeBlock( (void *)pArena->base );
 296         else
 297             HeapFree( GetProcessHeap(), 0, (void *)pArena->base );
 298         pArena->base = 0;
 299
 300         /* Note: we rely on the fact that SELECTOR_ReallocBlock won't
 301          * change the selector if we are shrinking the block.
 302          * FIXME: shouldn't we keep selectors until the block is deleted?
 303          */
 304         SELECTOR_ReallocBlock( sel, 0, 1 );
 305         return handle;
 306     }
 307
 308       /* Fixup the size */
 309
 310     if (size > GLOBAL_MAX_ALLOC_SIZE - 0x20) return 0;
 311     if (size == 0) size = 0x20;
 312     else size = (size + 0x1f) & ~0x1f;
 313
 314       /* Change the flags */
 315
 316     if (flags & GMEM_MODIFY)
 317     {
 318           /* Change the flags, leaving GA_DGROUP alone */
 319         pArena->flags = (pArena->flags & GA_DGROUP) | (flags & GA_MOVEABLE);
 320         if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 321         return handle;
 322     }
 323
 324       /* Reallocate the linear memory */
 325
 326     ptr = (void *)pArena->base;
 327     oldsize = pArena->size;
 328     TRACE("oldbase %p oldsize %08lx newsize %08lx\n", ptr,oldsize,size);
 329     if (ptr && (size == oldsize)) return handle;  /* Nothing to do */
 330
 331     if (pArena->flags & GA_DOSMEM)
 332     {
 333         if (DOSMEM_ResizeBlock(ptr, size, TRUE) == size)
 334             newptr = ptr;
 335         else if(pArena->pageLockCount > 0)
 336             newptr = 0;
 337         else
 338         {
 339             newptr = DOSMEM_GetBlock( size, 0 );
 340             if (newptr)
 341             {
 342                 memcpy( newptr, ptr, oldsize );
 343                 DOSMEM_FreeBlock( ptr );
 344             }
 345         }
 346     }
 347     else
 348     {
 349         /*
 350          * if more than one reader (e.g. some pointer has been
 351          * given out by GetVDMPointer32W16),
 352          * only try to realloc in place
 353          */
 354
 355         if (ptr)
 356             newptr = HeapReAlloc( GetProcessHeap(),
 357                 (pArena->pageLockCount > 0) ? HEAP_REALLOC_IN_PLACE_ONLY : 0,
 358                               ptr, size );
 359         else
 360             newptr = HeapAlloc( GetProcessHeap(),
 361                 (pArena->pageLockCount > 0) ? HEAP_REALLOC_IN_PLACE_ONLY : 0,
 362                               size );
 363
 364     }
 365
 366     if (!newptr)
 367     {
 368         FIXME("Realloc failed lock %d\n",pArena->pageLockCount);
 369         if (pArena->pageLockCount <1)
 370         {
 371             if (pArena->flags & GA_DOSMEM)
 372                 DOSMEM_FreeBlock( (void *)pArena->base );
 373             else
 374                 HeapFree( GetProcessHeap(), 0, ptr );
 375             SELECTOR_FreeBlock( sel );
 376             memset( pArena, 0, sizeof(GLOBALARENA) );
 377         }
 378         return 0;
 379     }
 380     ptr = newptr;
 381
 382       /* Reallocate the selector(s) */
 383
 384     sel = SELECTOR_ReallocBlock( sel, ptr, size );
 385     if (!sel)
 386     {
 387         if (pArena->flags & GA_DOSMEM)
 388             DOSMEM_FreeBlock( (void *)pArena->base );
 389         else
 390             HeapFree( GetProcessHeap(), 0, ptr );
 391         memset( pArena, 0, sizeof(GLOBALARENA) );
 392         return 0;
 393     }
 394     selcount = (size + 0xffff) / 0x10000;
 395
 396     if (!(pNewArena = GLOBAL_GetArena( sel, selcount )))
 397     {
 398         if (pArena->flags & GA_DOSMEM)
 399             DOSMEM_FreeBlock( (void *)pArena->base );
 400         else
 401             HeapFree( GetProcessHeap(), 0, ptr );
 402         SELECTOR_FreeBlock( sel );
 403         return 0;
 404     }
 405
 406       /* Fill the new arena block
 407          As we may have used HEAP_REALLOC_IN_PLACE_ONLY, areas may overlap*/
 408
 409     if (pNewArena != pArena) memmove( pNewArena, pArena, sizeof(GLOBALARENA) );
 410     pNewArena->base = (DWORD)ptr;
 411     pNewArena->size = GetSelectorLimit16(sel) + 1;
 412     pNewArena->selCount = selcount;
 413     pNewArena->handle = (pNewArena->flags & GA_MOVEABLE) ? sel - 1 : sel;
 414
 415     if (selcount > 1)  /* clear the next arena blocks */
 416         memset( pNewArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 417
 418     if ((oldsize < size) && (flags & GMEM_ZEROINIT))
 419         memset( (char *)ptr + oldsize, 0, size - oldsize );
 420     return pNewArena->handle;
 421 }
 422
 423
 424 /***********************************************************************
 425  *           GlobalFree     (KERNEL.17)
 426  *           GlobalFree16   (KERNEL32.31)
 427  * RETURNS
 428  *      NULL: Success
 429  *      Handle: Failure
 430  */
 431 HGLOBAL16 WINAPI GlobalFree16(
 432                  HGLOBAL16 handle /* [in] Handle of global memory object */
 433 ) {
 434     void *ptr;
 435
 436     if (!VALID_HANDLE(handle))
 437     {
 438         WARN("Invalid handle 0x%04x passed to GlobalFree16!\n",handle);
 439         return 0;
 440     }
 441     ptr = (void *)GET_ARENA_PTR(handle)->base;
 442
 443     TRACE("%04x\n", handle );
 444     if (!GLOBAL_FreeBlock( handle )) return handle;  /* failed */
 445     if (ptr) HeapFree( GetProcessHeap(), 0, ptr );
 446     return 0;
 447 }
 448
 449
 450 /**********************************************************************
 451  *           K32WOWGlobalLock16         (KERNEL32.60)
 452  */
 453 SEGPTR WINAPI K32WOWGlobalLock16( HGLOBAL16 handle )
 454 {
 455     WORD sel = GlobalHandleToSel16( handle );
 456     TRACE("(%04x) -> %08lx\n", handle, MAKELONG( 0, sel ) );
 457
 458     if (handle)
 459     {
 460         if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 461
 462         if (!VALID_HANDLE(handle)) {
 463             WARN("Invalid handle 0x%04x passed to WIN16_GlobalLock16!\n",handle);
 464             sel = 0;
 465         }
 466         else if (!GET_ARENA_PTR(handle)->base)
 467             sel = 0;
 468         else
 469             GET_ARENA_PTR(handle)->lockCount++;
 470     }
 471
 472     return MAKESEGPTR( sel, 0 );
 473
 474 }
 475
 476
 477 /***********************************************************************
 478  *           GlobalLock   (KERNEL.18)
 479  *
 480  * This is the GlobalLock16() function used by 16-bit code.
 481  */
 482 SEGPTR WINAPI WIN16_GlobalLock16( HGLOBAL16 handle )
 483 {
 484     SEGPTR ret = K32WOWGlobalLock16( handle );
 485     CURRENT_STACK16->ecx = SELECTOROF(ret);  /* selector must be returned in CX as well */
 486     return ret;
 487 }
 488
 489
 490 /***********************************************************************
 491  *           GlobalLock16   (KERNEL32.25)
 492  *
 493  * This is the GlobalLock16() function used by 32-bit code.
 494  *
 495  * RETURNS
 496  *      Pointer to first byte of memory block
 497  *      NULL: Failure
 498  */
 499 LPVOID WINAPI GlobalLock16(
 500               HGLOBAL16 handle /* [in] Handle of global memory object */
 501 ) {
 502     if (!handle) return 0;
 503     if (!VALID_HANDLE(handle))
 504         return 0;
 505     GET_ARENA_PTR(handle)->lockCount++;
 506     return (LPVOID)GET_ARENA_PTR(handle)->base;
 507 }
 508
 509
 510 /***********************************************************************
 511  *           GlobalUnlock     (KERNEL.19)
 512  *           GlobalUnlock16   (KERNEL32.26)
 513  * NOTES
 514  *      Should the return values be cast to booleans?
 515  *
 516  * RETURNS
 517  *      TRUE: Object is still locked
 518  *      FALSE: Object is unlocked
 519  */
 520 BOOL16 WINAPI GlobalUnlock16(
 521               HGLOBAL16 handle /* [in] Handle of global memory object */
 522 ) {
 523     GLOBALARENA *pArena = GET_ARENA_PTR(handle);
 524     if (!VALID_HANDLE(handle)) {
 525         WARN("Invalid handle 0x%04x passed to GlobalUnlock16!\n",handle);
 526         return 0;
 527     }
 528     TRACE("%04x\n", handle );
 529     if (pArena->lockCount) pArena->lockCount--;
 530     return pArena->lockCount;
 531 }
 532
 533 /***********************************************************************
 534  *     GlobalChangeLockCount               (KERNEL.365)
 535  *
 536  * This is declared as a register function as it has to preserve
 537  * *all* registers, even AX/DX !
 538  *
 539  */
 540 void WINAPI GlobalChangeLockCount16( HGLOBAL16 handle, INT16 delta,
 541                                      CONTEXT86 *context )
 542 {
 543     if ( delta == 1 )
 544         GlobalLock16( handle );
 545     else if ( delta == -1 )
 546         GlobalUnlock16( handle );
 547     else
 548         ERR("(%04X, %d): strange delta value\n", handle, delta );
 549 }
 550
 551 /***********************************************************************
 552  *           GlobalSize     (KERNEL.20)
 553  *           GlobalSize16   (KERNEL32.32)
 554  * RETURNS
 555  *      Size in bytes of object
 556  *      0: Failure
 557  */
 558 DWORD WINAPI GlobalSize16(
 559              HGLOBAL16 handle /* [in] Handle of global memory object */
 560 ) {
 561     TRACE("%04x\n", handle );
 562     if (!handle) return 0;
 563     if (!VALID_HANDLE(handle))
 564         return 0;
 565     return GET_ARENA_PTR(handle)->size;
 566 }
 567
 568
 569 /***********************************************************************
 570  *           GlobalHandle   (KERNEL.21)
 571  * NOTES
 572  *      Why is GlobalHandleToSel used here with the sel as input?
 573  *
 574  * RETURNS
 575  *      Handle: Success
 576  *      NULL: Failure
 577  */
 578 DWORD WINAPI GlobalHandle16(
 579              WORD sel /* [in] Address of global memory block */
 580 ) {
 581     TRACE("%04x\n", sel );
 582     if (!VALID_HANDLE(sel)) {
 583         WARN("Invalid handle 0x%04x passed to GlobalHandle16!\n",sel);
 584         return 0;
 585     }
 586     return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 587 }
 588
 589 /***********************************************************************
 590  *           GlobalHandleNoRIP   (KERNEL.159)
 591  */
 592 DWORD WINAPI GlobalHandleNoRIP16( WORD sel )
 593 {
 594     int i;
 595     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 596         if (pGlobalArena[i].size!=0 && pGlobalArena[i].handle == sel)
 597                 return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 598     }
 599     return 0;
 600 }
 601
 602
 603 /***********************************************************************
 604  *           GlobalFlags     (KERNEL.22)
 605  *
 606  * NOTES
 607  *      Should this return GMEM_INVALID_HANDLE instead of 0 on invalid
 608  *      handle?
 609  *
 610  * RETURNS
 611  *      Value specifying flags and lock count
 612  *      GMEM_INVALID_HANDLE: Invalid handle
 613  */
 614 UINT16 WINAPI GlobalFlags16(
 615               HGLOBAL16 handle /* [in] Handle of global memory object */
 616 ) {
 617     GLOBALARENA *pArena;
 618
 619     TRACE("%04x\n", handle );
 620     if (!VALID_HANDLE(handle)) {
 621         WARN("Invalid handle 0x%04x passed to GlobalFlags16!\n",handle);
 622         return 0;
 623     }
 624     pArena = GET_ARENA_PTR(handle);
 625     return pArena->lockCount |
 626            ((pArena->flags & GA_DISCARDABLE) ? GMEM_DISCARDABLE : 0) |
 627            ((pArena->base == 0) ? GMEM_DISCARDED : 0);
 628 }
 629
 630
 631 /***********************************************************************
 632  *           LockSegment   (KERNEL.23)
 633  */
 634 HGLOBAL16 WINAPI LockSegment16( HGLOBAL16 handle )
 635 {
 636     TRACE("%04x\n", handle );
 637     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 638     if (!VALID_HANDLE(handle)) {
 639         WARN("Invalid handle 0x%04x passed to LockSegment16!\n",handle);
 640         return 0;
 641     }
 642     GET_ARENA_PTR(handle)->lockCount++;
 643     return handle;
 644 }
 645
 646
 647 /***********************************************************************
 648  *           UnlockSegment   (KERNEL.24)
 649  */
 650 void WINAPI UnlockSegment16( HGLOBAL16 handle )
 651 {
 652     TRACE("%04x\n", handle );
 653     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 654     if (!VALID_HANDLE(handle)) {
 655         WARN("Invalid handle 0x%04x passed to UnlockSegment16!\n",handle);
 656         return;
 657     }
 658     GET_ARENA_PTR(handle)->lockCount--;
 659     /* FIXME: this ought to return the lock count in CX (go figure...) */
 660 }
 661
 662
 663 /***********************************************************************
 664  *           GlobalCompact   (KERNEL.25)
 665  */
 666 DWORD WINAPI GlobalCompact16( DWORD desired )
 667 {
 668     return GLOBAL_MAX_ALLOC_SIZE;
 669 }
 670
 671
 672 /***********************************************************************
 673  *           GlobalFreeAll   (KERNEL.26)
 674  */
 675 void WINAPI GlobalFreeAll16( HGLOBAL16 owner )
 676 {
 677     DWORD i;
 678     GLOBALARENA *pArena;
 679
 680     pArena = pGlobalArena;
 681     for (i = 0; i < globalArenaSize; i++, pArena++)
 682     {
 683         if ((pArena->size != 0) && (pArena->hOwner == owner))
 684             GlobalFree16( pArena->handle );
 685     }
 686 }
 687
 688
 689 /***********************************************************************
 690  *           GlobalWire     (KERNEL.111)
 691  *           GlobalWire16   (KERNEL32.29)
 692  */
 693 SEGPTR WINAPI GlobalWire16( HGLOBAL16 handle )
 694 {
 695     return WIN16_GlobalLock16( handle );
 696 }
 697
 698
 699 /***********************************************************************
 700  *           GlobalUnWire     (KERNEL.112)
 701  *           GlobalUnWire16   (KERNEL32.30)
 702  */
 703 BOOL16 WINAPI GlobalUnWire16( HGLOBAL16 handle )
 704 {
 705     return !GlobalUnlock16( handle );
 706 }
 707
 708
 709 /***********************************************************************
 710  *           SetSwapAreaSize   (KERNEL.106)
 711  */
 712 LONG WINAPI SetSwapAreaSize16( WORD size )
 713 {
 714     FIXME("(%d) - stub!\n", size );
 715     return MAKELONG( size, 0xffff );
 716 }
 717
 718
 719 /***********************************************************************
 720  *           GlobalLRUOldest   (KERNEL.163)
 721  */
 722 HGLOBAL16 WINAPI GlobalLRUOldest16( HGLOBAL16 handle )
 723 {
 724     TRACE("%04x\n", handle );
 725     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 726     return handle;
 727 }
 728
 729
 730 /***********************************************************************
 731  *           GlobalLRUNewest   (KERNEL.164)
 732  */
 733 HGLOBAL16 WINAPI GlobalLRUNewest16( HGLOBAL16 handle )
 734 {
 735     TRACE("%04x\n", handle );
 736     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 737     return handle;
 738 }
 739
 740
 741 /***********************************************************************
 742  *           GetFreeSpace   (KERNEL.169)
 743  */
 744 DWORD WINAPI GetFreeSpace16( UINT16 wFlags )
 745 {
 746     MEMORYSTATUS ms;
 747     GlobalMemoryStatus( &ms );
 748     return ms.dwAvailVirtual;
 749 }
 750
 751 /***********************************************************************
 752  *           GlobalDOSAlloc   (KERNEL.184)
 753  * RETURNS
 754  *      Address (HW=Paragraph segment; LW=Selector)
 755  */
 756 DWORD WINAPI GlobalDOSAlloc16(
 757              DWORD size /* [in] Number of bytes to be allocated */
 758 ) {
 759    UINT16    uParagraph;
 760    LPVOID    lpBlock = DOSMEM_GetBlock( size, &uParagraph );
 761
 762    if( lpBlock )
 763    {
 764        HMODULE16 hModule = GetModuleHandle16("KERNEL");
 765        WORD      wSelector;
 766        GLOBALARENA *pArena;
 767
 768        wSelector = GLOBAL_CreateBlock(GMEM_FIXED, lpBlock, size, hModule, WINE_LDT_FLAGS_DATA );
 769        pArena = GET_ARENA_PTR(wSelector);
 770        pArena->flags |= GA_DOSMEM;
 771        return MAKELONG(wSelector,uParagraph);
 772    }
 773    return 0;
 774 }
 775
 776
 777 /***********************************************************************
 778  *           GlobalDOSFree      (KERNEL.185)
 779  * RETURNS
 780  *      NULL: Success
 781  *      sel: Failure
 782  */
 783 WORD WINAPI GlobalDOSFree16(
 784             WORD sel /* [in] Selector */
 785 ) {
 786    DWORD   block = GetSelectorBase(sel);
 787
 788    if( block && block < 0x100000 )
 789    {
 790        LPVOID lpBlock = DOSMEM_MapDosToLinear( block );
 791        if( DOSMEM_FreeBlock( lpBlock ) )
 792            GLOBAL_FreeBlock( sel );
 793        sel = 0;
 794    }
 795    return sel;
 796 }
 797
 798
 799 /***********************************************************************
 800  *           GlobalPageLock   (KERNEL.191)
 801  *           GlobalSmartPageLock(KERNEL.230)
 802  */
 803 WORD WINAPI GlobalPageLock16( HGLOBAL16 handle )
 804 {
 805     TRACE("%04x\n", handle );
 806     if (!VALID_HANDLE(handle)) {
 807         WARN("Invalid handle 0x%04x passed to GlobalPageLock!\n",handle);
 808         return 0;
 809     }
 810     return ++(GET_ARENA_PTR(handle)->pageLockCount);
 811 }
 812
 813
 814 /***********************************************************************
 815  *           GlobalPageUnlock   (KERNEL.192)
 816  *           GlobalSmartPageUnlock(KERNEL.231)
 817  */
 818 WORD WINAPI GlobalPageUnlock16( HGLOBAL16 handle )
 819 {
 820     TRACE("%04x\n", handle );
 821     if (!VALID_HANDLE(handle)) {
 822         WARN("Invalid handle 0x%04x passed to GlobalPageUnlock!\n",handle);
 823         return 0;
 824     }
 825     return --(GET_ARENA_PTR(handle)->pageLockCount);
 826 }
 827
 828
 829 /***********************************************************************
 830  *           GlobalFix     (KERNEL.197)
 831  *           GlobalFix16   (KERNEL32.27)
 832  */
 833 WORD WINAPI GlobalFix16( HGLOBAL16 handle )
 834 {
 835     TRACE("%04x\n", handle );
 836     if (!VALID_HANDLE(handle)) {
 837         WARN("Invalid handle 0x%04x passed to GlobalFix16!\n",handle);
 838         return 0;
 839     }
 840     GET_ARENA_PTR(handle)->lockCount++;
 841
 842     return GlobalHandleToSel16(handle);
 843 }
 844
 845
 846 /***********************************************************************
 847  *           GlobalUnfix     (KERNEL.198)
 848  *           GlobalUnfix16   (KERNEL32.28)
 849  */
 850 void WINAPI GlobalUnfix16( HGLOBAL16 handle )
 851 {
 852     TRACE("%04x\n", handle );
 853     if (!VALID_HANDLE(handle)) {
 854         WARN("Invalid handle 0x%04x passed to GlobalUnfix16!\n",handle);
 855         return;
 856     }
 857     GET_ARENA_PTR(handle)->lockCount--;
 858 }
 859
 860
 861 /***********************************************************************
 862  *           FarSetOwner   (KERNEL.403)
 863  */
 864 void WINAPI FarSetOwner16( HGLOBAL16 handle, HANDLE16 hOwner )
 865 {
 866     if (!VALID_HANDLE(handle)) {
 867         WARN("Invalid handle 0x%04x passed to FarSetOwner!\n",handle);
 868         return;
 869     }
 870     GET_ARENA_PTR(handle)->hOwner = hOwner;
 871 }
 872
 873
 874 /***********************************************************************
 875  *           FarGetOwner   (KERNEL.404)
 876  */
 877 HANDLE16 WINAPI FarGetOwner16( HGLOBAL16 handle )
 878 {
 879     if (!VALID_HANDLE(handle)) {
 880         WARN("Invalid handle 0x%04x passed to FarGetOwner!\n",handle);
 881         return 0;
 882     }
 883     return GET_ARENA_PTR(handle)->hOwner;
 884 }
 885
 886
 887 /***********************************************************************
 888  *           GlobalHandleToSel   (TOOLHELP.50)
 889  */
 890 WORD WINAPI GlobalHandleToSel16( HGLOBAL16 handle )
 891 {
 892     if (!handle) return 0;
 893     if (!VALID_HANDLE(handle)) {
 894         WARN("Invalid handle 0x%04x passed to GlobalHandleToSel!\n",handle);
 895         return 0;
 896     }
 897     if (!(handle & 7))
 898     {
 899         WARN("Program attempted invalid selector conversion\n" );
 900         return handle - 1;
 901     }
 902     return handle | 7;
 903 }
 904
 905
 906 /***********************************************************************
 907  *           GlobalFirst   (TOOLHELP.51)
 908  */
 909 BOOL16 WINAPI GlobalFirst16( GLOBALENTRY *pGlobal, WORD wFlags )
 910 {
 911     if (wFlags == GLOBAL_LRU) return FALSE;
 912     pGlobal->dwNext = 0;
 913     return GlobalNext16( pGlobal, wFlags );
 914 }
 915
 916
 917 /***********************************************************************
 918  *           GlobalNext   (TOOLHELP.52)
 919  */
 920 BOOL16 WINAPI GlobalNext16( GLOBALENTRY *pGlobal, WORD wFlags)
 921 {
 922     GLOBALARENA *pArena;
 923
 924     if (pGlobal->dwNext >= globalArenaSize) return FALSE;
 925     pArena = pGlobalArena + pGlobal->dwNext;
 926     if (wFlags == GLOBAL_FREE)  /* only free blocks */
 927     {
 928         int i;
 929         for (i = pGlobal->dwNext; i < globalArenaSize; i++, pArena++)
 930             if (pArena->size == 0) break;  /* block is free */
 931         if (i >= globalArenaSize) return FALSE;
 932         pGlobal->dwNext = i;
 933     }
 934
 935     pGlobal->dwAddress    = pArena->base;
 936     pGlobal->dwBlockSize  = pArena->size;
 937     pGlobal->hBlock       = pArena->handle;
 938     pGlobal->wcLock       = pArena->lockCount;
 939     pGlobal->wcPageLock   = pArena->pageLockCount;
 940     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
 941     pGlobal->wHeapPresent = FALSE;
 942     pGlobal->hOwner       = pArena->hOwner;
 943     pGlobal->wType        = GT_UNKNOWN;
 944     pGlobal->wData        = 0;
 945     pGlobal->dwNext++;
 946     return TRUE;
 947 }
 948
 949
 950 /***********************************************************************
 951  *           GlobalInfo   (TOOLHELP.53)
 952  */
 953 BOOL16 WINAPI GlobalInfo16( GLOBALINFO *pInfo )
 954 {
 955     int i;
 956     GLOBALARENA *pArena;
 957
 958     pInfo->wcItems = globalArenaSize;
 959     pInfo->wcItemsFree = 0;
 960     pInfo->wcItemsLRU = 0;
 961     for (i = 0, pArena = pGlobalArena; i < globalArenaSize; i++, pArena++)
 962         if (pArena->size == 0) pInfo->wcItemsFree++;
 963     return TRUE;
 964 }
 965
 966
 967 /***********************************************************************
 968  *           GlobalEntryHandle   (TOOLHELP.54)
 969  */
 970 BOOL16 WINAPI GlobalEntryHandle16( GLOBALENTRY *pGlobal, HGLOBAL16 hItem )
 971 {
 972     GLOBALARENA *pArena = GET_ARENA_PTR(hItem);
 973
 974     pGlobal->dwAddress    = pArena->base;
 975     pGlobal->dwBlockSize  = pArena->size;
 976     pGlobal->hBlock       = pArena->handle;
 977     pGlobal->wcLock       = pArena->lockCount;
 978     pGlobal->wcPageLock   = pArena->pageLockCount;
 979     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
 980     pGlobal->wHeapPresent = FALSE;
 981     pGlobal->hOwner       = pArena->hOwner;
 982     pGlobal->wType        = GT_UNKNOWN;
 983     pGlobal->wData        = 0;
 984     pGlobal->dwNext++;
 985     return TRUE;
 986 }
 987
 988
 989 /***********************************************************************
 990  *           GlobalEntryModule   (TOOLHELP.55)
 991  */
 992 BOOL16 WINAPI GlobalEntryModule16( GLOBALENTRY *pGlobal, HMODULE16 hModule,
 993                                  WORD wSeg )
 994 {
 995     FIXME("(%p, 0x%04x, 0x%04x), stub.\n", pGlobal, hModule, wSeg);
 996     return FALSE;
 997 }
 998
 999
1000 /***********************************************************************
1001  *           MemManInfo   (TOOLHELP.72)
1002  */
1003 BOOL16 WINAPI MemManInfo16( MEMMANINFO *info )
1004 {
1005     MEMORYSTATUS status;
1006
1007     /*
1008      * Not unsurprisingly although the documention says you
1009      * _must_ provide the size in the dwSize field, this function
1010      * (under Windows) always fills the structure and returns true.
1011      */
1012     GlobalMemoryStatus( &status );
1013     info->wPageSize            = getpagesize();
1014     info->dwLargestFreeBlock   = status.dwAvailVirtual;
1015     info->dwMaxPagesAvailable  = info->dwLargestFreeBlock / info->wPageSize;
1016     info->dwMaxPagesLockable   = info->dwMaxPagesAvailable;
1017     info->dwTotalLinearSpace   = status.dwTotalVirtual / info->wPageSize;
1018     info->dwTotalUnlockedPages = info->dwTotalLinearSpace;
1019     info->dwFreePages          = info->dwMaxPagesAvailable;
1020     info->dwTotalPages         = info->dwTotalLinearSpace;
1021     info->dwFreeLinearSpace    = info->dwMaxPagesAvailable;
1022     info->dwSwapFilePages      = status.dwTotalPageFile / info->wPageSize;
1023     return TRUE;
1024 }
1025
1026 /***********************************************************************
1027  *           GetFreeMemInfo   (KERNEL.316)
1028  */
1029 DWORD WINAPI GetFreeMemInfo16(void)
1030 {
1031     MEMMANINFO info;
1032     MemManInfo16( &info );
1033     return MAKELONG( info.dwTotalLinearSpace, info.dwMaxPagesAvailable );
1034 }
1035
1036 /***********************************************************************
1037  *           A20Proc   (KERNEL.165)
1038  *           A20_Proc  (SYSTEM.20)
1039  */
1040 void WINAPI A20Proc16( WORD unused )
1041 {
1042     /* this is also a NOP in Windows */
1043 }
1044
1045 /***********************************************************************
1046  *           LimitEMSPages   (KERNEL.156)
1047  */
1048 DWORD WINAPI LimitEMSPages16( DWORD unused )
1049 {
1050     return 0;
1051 }