dlls/kernel32/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 "winternl.h"
  42 #include "kernel_private.h"
  43 #include "kernel16_private.h"
  44 #include "wine/debug.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(global);
  47
  48   /* Global arena block */
  49 typedef struct
  50 {
  51     void     *base;          /* Base address (0 if discarded) */
  52     DWORD     size;          /* Size in bytes (0 indicates a free block) */
  53     HGLOBAL16 handle;        /* Handle for this block */
  54     HGLOBAL16 hOwner;        /* Owner of this block */
  55     BYTE      lockCount;     /* Count of GlobalFix() calls */
  56     BYTE      pageLockCount; /* Count of GlobalPageLock() calls */
  57     BYTE      flags;         /* Allocation flags */
  58     BYTE      selCount;      /* Number of selectors allocated for this block */
  59 } GLOBALARENA;
  60
  61   /* Flags definitions */
  62 #define GA_MOVEABLE     0x02  /* same as GMEM_MOVEABLE */
  63 #define GA_DGROUP       0x04
  64 #define GA_DISCARDABLE  0x08
  65 #define GA_IPCSHARE     0x10  /* same as GMEM_DDESHARE */
  66 #define GA_DOSMEM       0x20
  67
  68 /* Arena array (FIXME) */
  69 static GLOBALARENA *pGlobalArena;
  70 static int globalArenaSize;
  71
  72 #define GLOBAL_MAX_ALLOC_SIZE 0x00ff0000  /* Largest allocation is 16M - 64K */
  73 #define GLOBAL_MAX_COUNT      8192        /* Max number of allocated blocks */
  74
  75 #define VALID_HANDLE(handle) (((handle)>>__AHSHIFT)<globalArenaSize)
  76 #define GET_ARENA_PTR(handle)  (pGlobalArena + ((handle) >> __AHSHIFT))
  77
  78 static inline void*     DOSMEM_AllocBlock(UINT size, UINT16* pseg)
  79 {
  80     if (!winedos.AllocDosBlock) load_winedos();
  81     return winedos.AllocDosBlock ? winedos.AllocDosBlock(size, pseg) : NULL;
  82 }
  83
  84 static inline BOOL      DOSMEM_FreeBlock(void* ptr)
  85 {
  86     if (!winedos.FreeDosBlock) load_winedos();
  87     return winedos.FreeDosBlock ? winedos.FreeDosBlock( ptr ) : FALSE;
  88 }
  89
  90 static inline UINT      DOSMEM_ResizeBlock(void *ptr, UINT size, BOOL exact)
  91 {
  92     if (!winedos.ResizeDosBlock) load_winedos();
  93     return winedos.ResizeDosBlock ? winedos.ResizeDosBlock(ptr, size, TRUE) : 0;
  94 }
  95
  96 static HANDLE get_win16_heap(void)
  97 {
  98     static HANDLE win16_heap;
  99
 100     /* we create global memory block with execute permission. The access can be limited
 101      * for 16-bit code on selector level */
 102     if (!win16_heap) win16_heap = HeapCreate(HEAP_CREATE_ENABLE_EXECUTE, 0, 0);
 103     return win16_heap;
 104 }
 105
 106 /***********************************************************************
 107  *           GLOBAL_GetArena
 108  *
 109  * Return the arena for a given selector, growing the arena array if needed.
 110  */
 111 static GLOBALARENA *GLOBAL_GetArena( WORD sel, WORD selcount )
 112 {
 113     if (((sel >> __AHSHIFT) + selcount) > globalArenaSize)
 114     {
 115         int newsize = ((sel >> __AHSHIFT) + selcount + 0xff) & ~0xff;
 116
 117         if (!pGlobalArena)
 118         {
 119             pGlobalArena = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 120                                       GLOBAL_MAX_COUNT * sizeof(GLOBALARENA) );
 121             if (!pGlobalArena) return 0;
 122             /* Hack: store a pointer to it in THHOOK instead of a handle */
 123             *(GLOBALARENA **)&pThhook->hGlobalHeap = pGlobalArena;
 124         }
 125         if (newsize > GLOBAL_MAX_COUNT) return 0;
 126         globalArenaSize = newsize;
 127     }
 128     return pGlobalArena + (sel >> __AHSHIFT);
 129 }
 130
 131 void debug_handles(void)
 132 {
 133     int printed=0;
 134     int i;
 135     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 136         if (pGlobalArena[i].size!=0 && (pGlobalArena[i].handle & 0x8000)){
 137             printed=1;
 138             DPRINTF("0x%08x, ",pGlobalArena[i].handle);
 139         }
 140     }
 141     if (printed)
 142         DPRINTF("\n");
 143 }
 144
 145
 146 /***********************************************************************
 147  *           GLOBAL_CreateBlock
 148  *
 149  * Create a global heap block for a fixed range of linear memory.
 150  */
 151 HGLOBAL16 GLOBAL_CreateBlock( WORD flags, void *ptr, DWORD size,
 152                               HGLOBAL16 hOwner, unsigned char selflags )
 153 {
 154     WORD sel, selcount;
 155     GLOBALARENA *pArena;
 156
 157       /* Allocate the selector(s) */
 158
 159     sel = SELECTOR_AllocBlock( ptr, size, selflags );
 160     if (!sel) return 0;
 161     selcount = (size + 0xffff) / 0x10000;
 162
 163     if (!(pArena = GLOBAL_GetArena( sel, selcount )))
 164     {
 165         SELECTOR_FreeBlock( sel );
 166         return 0;
 167     }
 168
 169       /* Fill the arena block */
 170
 171     pArena->base = ptr;
 172     pArena->size = GetSelectorLimit16(sel) + 1;
 173     pArena->handle = (flags & GMEM_MOVEABLE) ? sel - 1 : sel;
 174     pArena->hOwner = hOwner;
 175     pArena->lockCount = 0;
 176     pArena->pageLockCount = 0;
 177     pArena->flags = flags & GA_MOVEABLE;
 178     if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 179     if (flags & GMEM_DDESHARE) pArena->flags |= GA_IPCSHARE;
 180     if (!(selflags & (WINE_LDT_FLAGS_CODE^WINE_LDT_FLAGS_DATA))) pArena->flags |= GA_DGROUP;
 181     pArena->selCount = selcount;
 182     if (selcount > 1)  /* clear the next arena blocks */
 183         memset( pArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 184
 185     return pArena->handle;
 186 }
 187
 188
 189 /***********************************************************************
 190  *           GLOBAL_FreeBlock
 191  *
 192  * Free a block allocated by GLOBAL_CreateBlock, without touching
 193  * the associated linear memory range.
 194  */
 195 BOOL16 GLOBAL_FreeBlock( HGLOBAL16 handle )
 196 {
 197     WORD sel;
 198     GLOBALARENA *pArena;
 199
 200     if (!handle) return TRUE;
 201     sel = GlobalHandleToSel16( handle );
 202     if (!VALID_HANDLE(sel)) return FALSE;
 203     pArena = GET_ARENA_PTR(sel);
 204     SELECTOR_FreeBlock( sel );
 205     memset( pArena, 0, sizeof(GLOBALARENA) );
 206     return TRUE;
 207 }
 208
 209 /***********************************************************************
 210  *           GLOBAL_MoveBlock
 211  */
 212 BOOL16 GLOBAL_MoveBlock( HGLOBAL16 handle, void *ptr, DWORD size )
 213 {
 214     WORD sel;
 215     GLOBALARENA *pArena;
 216
 217     if (!handle) return TRUE;
 218     sel = GlobalHandleToSel16( handle );
 219     if (!VALID_HANDLE(sel)) return FALSE;
 220     pArena = GET_ARENA_PTR(sel);
 221     if (pArena->selCount != 1)
 222         return FALSE;
 223
 224     pArena->base = ptr;
 225     pArena->size = size;
 226     SELECTOR_ReallocBlock( sel, ptr, size );
 227     return TRUE;
 228 }
 229
 230 /***********************************************************************
 231  *           GLOBAL_Alloc
 232  *
 233  * Implementation of GlobalAlloc16()
 234  */
 235 HGLOBAL16 GLOBAL_Alloc( UINT16 flags, DWORD size, HGLOBAL16 hOwner, unsigned char selflags )
 236 {
 237     void *ptr;
 238     HGLOBAL16 handle;
 239
 240     TRACE("%d flags=%04x\n", size, flags );
 241
 242     /* If size is 0, create a discarded block */
 243
 244     if (size == 0) return GLOBAL_CreateBlock( flags, NULL, 1, hOwner, selflags );
 245
 246     /* Fixup the size */
 247
 248     if (size >= GLOBAL_MAX_ALLOC_SIZE - 0x1f) return 0;
 249     size = (size + 0x1f) & ~0x1f;
 250
 251     /* Allocate the linear memory */
 252     ptr = HeapAlloc( get_win16_heap(), 0, size );
 253       /* FIXME: free discardable blocks and try again? */
 254     if (!ptr) return 0;
 255
 256       /* Allocate the selector(s) */
 257
 258     handle = GLOBAL_CreateBlock( flags, ptr, size, hOwner, selflags );
 259     if (!handle)
 260     {
 261         HeapFree( get_win16_heap(), 0, ptr );
 262         return 0;
 263     }
 264
 265     if (flags & GMEM_ZEROINIT) memset( ptr, 0, size );
 266     return handle;
 267 }
 268
 269 /***********************************************************************
 270  *           GlobalAlloc     (KERNEL.15)
 271  *           GlobalAlloc16   (KERNEL32.24)
 272  *
 273  * Allocate a global memory object.
 274  *
 275  * RETURNS
 276  *      Handle: Success
 277  *      NULL: Failure
 278  */
 279 HGLOBAL16 WINAPI GlobalAlloc16(
 280                  UINT16 flags, /* [in] Object allocation attributes */
 281                  DWORD size    /* [in] Number of bytes to allocate */
 282 ) {
 283     HANDLE16 owner = GetCurrentPDB16();
 284
 285     if (flags & GMEM_DDESHARE)
 286         owner = GetExePtr(owner);  /* Make it a module handle */
 287     return GLOBAL_Alloc( flags, size, owner, WINE_LDT_FLAGS_DATA );
 288 }
 289
 290
 291 /***********************************************************************
 292  *           GlobalReAlloc     (KERNEL.16)
 293  *
 294  * Change the size or attributes of a global memory object.
 295  *
 296  * RETURNS
 297  *      Handle: Success
 298  *      NULL: Failure
 299  */
 300 HGLOBAL16 WINAPI GlobalReAlloc16(
 301                  HGLOBAL16 handle, /* [in] Handle of global memory object */
 302                  DWORD size,       /* [in] New size of block */
 303                  UINT16 flags      /* [in] How to reallocate object */
 304 ) {
 305     WORD selcount;
 306     DWORD oldsize;
 307     void *ptr, *newptr;
 308     GLOBALARENA *pArena, *pNewArena;
 309     WORD sel = GlobalHandleToSel16( handle );
 310     HANDLE heap = get_win16_heap();
 311
 312     TRACE("%04x %d flags=%04x\n",
 313                     handle, size, flags );
 314     if (!handle) return 0;
 315
 316     if (!VALID_HANDLE(handle))
 317     {
 318         WARN("Invalid handle 0x%04x!\n", handle);
 319         return 0;
 320     }
 321     pArena = GET_ARENA_PTR( handle );
 322
 323       /* Discard the block if requested */
 324
 325     if ((size == 0) && (flags & GMEM_MOVEABLE) && !(flags & GMEM_MODIFY))
 326     {
 327         if (!(pArena->flags & GA_MOVEABLE) ||
 328             !(pArena->flags & GA_DISCARDABLE) ||
 329             (pArena->lockCount > 0) || (pArena->pageLockCount > 0)) return 0;
 330         if (pArena->flags & GA_DOSMEM)
 331             DOSMEM_FreeBlock( pArena->base );
 332         else
 333             HeapFree( heap, 0, pArena->base );
 334         pArena->base = 0;
 335
 336         /* Note: we rely on the fact that SELECTOR_ReallocBlock won't
 337          * change the selector if we are shrinking the block.
 338          * FIXME: shouldn't we keep selectors until the block is deleted?
 339          */
 340         SELECTOR_ReallocBlock( sel, 0, 1 );
 341         return handle;
 342     }
 343
 344       /* Fixup the size */
 345
 346     if (size > GLOBAL_MAX_ALLOC_SIZE - 0x20) return 0;
 347     if (size == 0) size = 0x20;
 348     else size = (size + 0x1f) & ~0x1f;
 349
 350       /* Change the flags */
 351
 352     if (flags & GMEM_MODIFY)
 353     {
 354           /* Change the flags, leaving GA_DGROUP alone */
 355         pArena->flags = (pArena->flags & GA_DGROUP) | (flags & GA_MOVEABLE);
 356         if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 357         return handle;
 358     }
 359
 360       /* Reallocate the linear memory */
 361
 362     ptr = pArena->base;
 363     oldsize = pArena->size;
 364     TRACE("oldbase %p oldsize %08x newsize %08x\n", ptr,oldsize,size);
 365     if (ptr && (size == oldsize)) return handle;  /* Nothing to do */
 366
 367     if (pArena->flags & GA_DOSMEM)
 368     {
 369         if (DOSMEM_ResizeBlock(ptr, size, TRUE) == size)
 370             newptr = ptr;
 371         else if(pArena->pageLockCount > 0)
 372             newptr = 0;
 373         else
 374         {
 375             newptr = DOSMEM_AllocBlock( size, 0 );
 376             if (newptr)
 377             {
 378                 memcpy( newptr, ptr, oldsize );
 379                 DOSMEM_FreeBlock( ptr );
 380             }
 381         }
 382     }
 383     else
 384     {
 385         /*
 386          * if more than one reader (e.g. some pointer has been
 387          * given out by GetVDMPointer32W16),
 388          * only try to realloc in place
 389          */
 390
 391         if (ptr)
 392             newptr = HeapReAlloc( heap,
 393                 (pArena->pageLockCount > 0) ? HEAP_REALLOC_IN_PLACE_ONLY : 0,
 394                               ptr, size );
 395         else
 396             newptr = HeapAlloc( heap, 0, size );
 397
 398     }
 399
 400     if (!newptr)
 401     {
 402         FIXME("Realloc failed lock %d\n",pArena->pageLockCount);
 403         if (pArena->pageLockCount <1)
 404         {
 405             if (pArena->flags & GA_DOSMEM)
 406                 DOSMEM_FreeBlock( pArena->base );
 407             else
 408                 HeapFree( heap, 0, ptr );
 409             SELECTOR_FreeBlock( sel );
 410             memset( pArena, 0, sizeof(GLOBALARENA) );
 411         }
 412         return 0;
 413     }
 414     ptr = newptr;
 415
 416       /* Reallocate the selector(s) */
 417
 418     sel = SELECTOR_ReallocBlock( sel, ptr, size );
 419     if (!sel)
 420     {
 421         if (pArena->flags & GA_DOSMEM)
 422             DOSMEM_FreeBlock( pArena->base );
 423         else
 424             HeapFree( heap, 0, ptr );
 425         memset( pArena, 0, sizeof(GLOBALARENA) );
 426         return 0;
 427     }
 428     selcount = (size + 0xffff) / 0x10000;
 429
 430     if (!(pNewArena = GLOBAL_GetArena( sel, selcount )))
 431     {
 432         if (pArena->flags & GA_DOSMEM)
 433             DOSMEM_FreeBlock( pArena->base );
 434         else
 435             HeapFree( heap, 0, ptr );
 436         SELECTOR_FreeBlock( sel );
 437         return 0;
 438     }
 439
 440       /* Fill the new arena block
 441          As we may have used HEAP_REALLOC_IN_PLACE_ONLY, areas may overlap*/
 442
 443     if (pNewArena != pArena) memmove( pNewArena, pArena, sizeof(GLOBALARENA) );
 444     pNewArena->base = ptr;
 445     pNewArena->size = GetSelectorLimit16(sel) + 1;
 446     pNewArena->selCount = selcount;
 447     pNewArena->handle = (pNewArena->flags & GA_MOVEABLE) ? sel - 1 : sel;
 448
 449     if (selcount > 1)  /* clear the next arena blocks */
 450         memset( pNewArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 451
 452     if ((oldsize < size) && (flags & GMEM_ZEROINIT))
 453         memset( (char *)ptr + oldsize, 0, size - oldsize );
 454     return pNewArena->handle;
 455 }
 456
 457
 458 /***********************************************************************
 459  *           GlobalFree     (KERNEL.17)
 460  *           GlobalFree16   (KERNEL32.31)
 461  * RETURNS
 462  *      NULL: Success
 463  *      Handle: Failure
 464  */
 465 HGLOBAL16 WINAPI GlobalFree16(
 466                  HGLOBAL16 handle /* [in] Handle of global memory object */
 467 ) {
 468     void *ptr;
 469
 470     if (!VALID_HANDLE(handle))
 471     {
 472         WARN("Invalid handle 0x%04x passed to GlobalFree16!\n",handle);
 473         return 0;
 474     }
 475     ptr = GET_ARENA_PTR(handle)->base;
 476
 477     TRACE("%04x\n", handle );
 478     if (!GLOBAL_FreeBlock( handle )) return handle;  /* failed */
 479     HeapFree( get_win16_heap(), 0, ptr );
 480     return 0;
 481 }
 482
 483
 484 /**********************************************************************
 485  *           K32WOWGlobalLock16         (KERNEL32.60)
 486  */
 487 SEGPTR WINAPI K32WOWGlobalLock16( HGLOBAL16 handle )
 488 {
 489     WORD sel = GlobalHandleToSel16( handle );
 490     TRACE("(%04x) -> %08x\n", handle, MAKELONG( 0, sel ) );
 491
 492     if (handle)
 493     {
 494         if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 495
 496         if (!VALID_HANDLE(handle)) {
 497             WARN("Invalid handle 0x%04x passed to WIN16_GlobalLock16!\n",handle);
 498             sel = 0;
 499         }
 500         else if (!GET_ARENA_PTR(handle)->base)
 501             sel = 0;
 502         else
 503             GET_ARENA_PTR(handle)->lockCount++;
 504     }
 505
 506     return MAKESEGPTR( sel, 0 );
 507
 508 }
 509
 510
 511 /***********************************************************************
 512  *           GlobalLock   (KERNEL.18)
 513  *
 514  * This is the GlobalLock16() function used by 16-bit code.
 515  */
 516 SEGPTR WINAPI WIN16_GlobalLock16( HGLOBAL16 handle )
 517 {
 518     SEGPTR ret = K32WOWGlobalLock16( handle );
 519     CURRENT_STACK16->ecx = SELECTOROF(ret);  /* selector must be returned in CX as well */
 520     return ret;
 521 }
 522
 523
 524 /***********************************************************************
 525  *           GlobalLock16   (KERNEL32.25)
 526  *
 527  * This is the GlobalLock16() function used by 32-bit code.
 528  *
 529  * RETURNS
 530  *      Pointer to first byte of memory block
 531  *      NULL: Failure
 532  */
 533 LPVOID WINAPI GlobalLock16(
 534               HGLOBAL16 handle /* [in] Handle of global memory object */
 535 ) {
 536     if (!handle) return 0;
 537     if (!VALID_HANDLE(handle))
 538         return 0;
 539     GET_ARENA_PTR(handle)->lockCount++;
 540     return GET_ARENA_PTR(handle)->base;
 541 }
 542
 543
 544 /***********************************************************************
 545  *           GlobalUnlock     (KERNEL.19)
 546  *           GlobalUnlock16   (KERNEL32.26)
 547  * NOTES
 548  *      Should the return values be cast to booleans?
 549  *
 550  * RETURNS
 551  *      TRUE: Object is still locked
 552  *      FALSE: Object is unlocked
 553  */
 554 BOOL16 WINAPI GlobalUnlock16(
 555               HGLOBAL16 handle /* [in] Handle of global memory object */
 556 ) {
 557     GLOBALARENA *pArena = GET_ARENA_PTR(handle);
 558     if (!VALID_HANDLE(handle)) {
 559         WARN("Invalid handle 0x%04x passed to GlobalUnlock16!\n",handle);
 560         return 0;
 561     }
 562     TRACE("%04x\n", handle );
 563     if (pArena->lockCount) pArena->lockCount--;
 564     return pArena->lockCount;
 565 }
 566
 567 /***********************************************************************
 568  *     GlobalChangeLockCount               (KERNEL.365)
 569  *
 570  * This is declared as a register function as it has to preserve
 571  * *all* registers, even AX/DX !
 572  *
 573  */
 574 void WINAPI GlobalChangeLockCount16( HGLOBAL16 handle, INT16 delta,
 575                                      CONTEXT86 *context )
 576 {
 577     if ( delta == 1 )
 578         GlobalLock16( handle );
 579     else if ( delta == -1 )
 580         GlobalUnlock16( handle );
 581     else
 582         ERR("(%04X, %d): strange delta value\n", handle, delta );
 583 }
 584
 585 /***********************************************************************
 586  *           GlobalSize     (KERNEL.20)
 587  *           GlobalSize16   (KERNEL32.32)
 588  *
 589  * Get the current size of a global memory object.
 590  *
 591  * RETURNS
 592  *      Size in bytes of object
 593  *      0: Failure
 594  */
 595 DWORD WINAPI GlobalSize16(
 596              HGLOBAL16 handle /* [in] Handle of global memory object */
 597 ) {
 598     TRACE("%04x\n", handle );
 599     if (!handle) return 0;
 600     if (!VALID_HANDLE(handle))
 601         return 0;
 602     return GET_ARENA_PTR(handle)->size;
 603 }
 604
 605
 606 /***********************************************************************
 607  *           GlobalHandle   (KERNEL.21)
 608  *
 609  * Get the handle associated with a pointer to the global memory block.
 610  *
 611  * NOTES
 612  *      Why is GlobalHandleToSel used here with the sel as input?
 613  *
 614  * RETURNS
 615  *      Handle: Success
 616  *      NULL: Failure
 617  */
 618 DWORD WINAPI GlobalHandle16(
 619              WORD sel /* [in] Address of global memory block */
 620 ) {
 621     TRACE("%04x\n", sel );
 622     if (!VALID_HANDLE(sel)) {
 623         WARN("Invalid handle 0x%04x passed to GlobalHandle16!\n",sel);
 624         return 0;
 625     }
 626     return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 627 }
 628
 629 /***********************************************************************
 630  *           GlobalHandleNoRIP   (KERNEL.159)
 631  */
 632 DWORD WINAPI GlobalHandleNoRIP16( WORD sel )
 633 {
 634     int i;
 635     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 636         if (pGlobalArena[i].size!=0 && pGlobalArena[i].handle == sel)
 637                 return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 638     }
 639     return 0;
 640 }
 641
 642
 643 /***********************************************************************
 644  *           GlobalFlags     (KERNEL.22)
 645  *
 646  * Get information about a global memory object.
 647  *
 648  * NOTES
 649  *      Should this return GMEM_INVALID_HANDLE instead of 0 on invalid
 650  *      handle?
 651  *
 652  * RETURNS
 653  *      Value specifying flags and lock count
 654  *      GMEM_INVALID_HANDLE: Invalid handle
 655  */
 656 UINT16 WINAPI GlobalFlags16(
 657               HGLOBAL16 handle /* [in] Handle of global memory object */
 658 ) {
 659     GLOBALARENA *pArena;
 660
 661     TRACE("%04x\n", handle );
 662     if (!VALID_HANDLE(handle)) {
 663         WARN("Invalid handle 0x%04x passed to GlobalFlags16!\n",handle);
 664         return 0;
 665     }
 666     pArena = GET_ARENA_PTR(handle);
 667     return pArena->lockCount |
 668            ((pArena->flags & GA_DISCARDABLE) ? GMEM_DISCARDABLE : 0) |
 669            ((pArena->base == 0) ? GMEM_DISCARDED : 0);
 670 }
 671
 672
 673 /***********************************************************************
 674  *           LockSegment   (KERNEL.23)
 675  */
 676 HGLOBAL16 WINAPI LockSegment16( HGLOBAL16 handle )
 677 {
 678     TRACE("%04x\n", handle );
 679     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 680     if (!VALID_HANDLE(handle)) {
 681         WARN("Invalid handle 0x%04x passed to LockSegment16!\n",handle);
 682         return 0;
 683     }
 684     GET_ARENA_PTR(handle)->lockCount++;
 685     return handle;
 686 }
 687
 688
 689 /***********************************************************************
 690  *           UnlockSegment   (KERNEL.24)
 691  */
 692 void WINAPI UnlockSegment16( HGLOBAL16 handle )
 693 {
 694     TRACE("%04x\n", handle );
 695     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 696     if (!VALID_HANDLE(handle)) {
 697         WARN("Invalid handle 0x%04x passed to UnlockSegment16!\n",handle);
 698         return;
 699     }
 700     GET_ARENA_PTR(handle)->lockCount--;
 701     /* FIXME: this ought to return the lock count in CX (go figure...) */
 702 }
 703
 704
 705 /***********************************************************************
 706  *           GlobalCompact   (KERNEL.25)
 707  */
 708 DWORD WINAPI GlobalCompact16( DWORD desired )
 709 {
 710     return GLOBAL_MAX_ALLOC_SIZE;
 711 }
 712
 713
 714 /***********************************************************************
 715  *           GlobalFreeAll   (KERNEL.26)
 716  */
 717 void WINAPI GlobalFreeAll16( HGLOBAL16 owner )
 718 {
 719     int i;
 720     GLOBALARENA *pArena;
 721
 722     pArena = pGlobalArena;
 723     for (i = 0; i < globalArenaSize; i++, pArena++)
 724     {
 725         if ((pArena->size != 0) && (pArena->hOwner == owner))
 726             GlobalFree16( pArena->handle );
 727     }
 728 }
 729
 730
 731 /***********************************************************************
 732  *           GlobalWire     (KERNEL.111)
 733  *           GlobalWire16   (KERNEL32.29)
 734  */
 735 SEGPTR WINAPI GlobalWire16( HGLOBAL16 handle )
 736 {
 737     return WIN16_GlobalLock16( handle );
 738 }
 739
 740
 741 /***********************************************************************
 742  *           GlobalUnWire     (KERNEL.112)
 743  *           GlobalUnWire16   (KERNEL32.30)
 744  */
 745 BOOL16 WINAPI GlobalUnWire16( HGLOBAL16 handle )
 746 {
 747     return !GlobalUnlock16( handle );
 748 }
 749
 750
 751 /***********************************************************************
 752  *           SetSwapAreaSize   (KERNEL.106)
 753  */
 754 LONG WINAPI SetSwapAreaSize16( WORD size )
 755 {
 756     FIXME("(%d) - stub!\n", size );
 757     return MAKELONG( size, 0xffff );
 758 }
 759
 760
 761 /***********************************************************************
 762  *           GlobalLRUOldest   (KERNEL.163)
 763  */
 764 HGLOBAL16 WINAPI GlobalLRUOldest16( HGLOBAL16 handle )
 765 {
 766     TRACE("%04x\n", handle );
 767     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 768     return handle;
 769 }
 770
 771
 772 /***********************************************************************
 773  *           GlobalLRUNewest   (KERNEL.164)
 774  */
 775 HGLOBAL16 WINAPI GlobalLRUNewest16( HGLOBAL16 handle )
 776 {
 777     TRACE("%04x\n", handle );
 778     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 779     return handle;
 780 }
 781
 782
 783 /***********************************************************************
 784  *           GetFreeSpace   (KERNEL.169)
 785  */
 786 DWORD WINAPI GetFreeSpace16( UINT16 wFlags )
 787 {
 788     MEMORYSTATUS ms;
 789     GlobalMemoryStatus( &ms );
 790     return ms.dwAvailVirtual;
 791 }
 792
 793 /***********************************************************************
 794  *           GlobalDOSAlloc   (KERNEL.184)
 795  *
 796  * Allocate memory in the first MB.
 797  *
 798  * RETURNS
 799  *      Address (HW=Paragraph segment; LW=Selector)
 800  */
 801 DWORD WINAPI GlobalDOSAlloc16(
 802              DWORD size /* [in] Number of bytes to be allocated */
 803 ) {
 804    UINT16    uParagraph;
 805    LPVOID    lpBlock = DOSMEM_AllocBlock( size, &uParagraph );
 806
 807    if( lpBlock )
 808    {
 809        HMODULE16 hModule = GetModuleHandle16("KERNEL");
 810        WORD      wSelector;
 811        GLOBALARENA *pArena;
 812
 813        wSelector = GLOBAL_CreateBlock(GMEM_FIXED, lpBlock, size, hModule, WINE_LDT_FLAGS_DATA );
 814        pArena = GET_ARENA_PTR(wSelector);
 815        pArena->flags |= GA_DOSMEM;
 816        return MAKELONG(wSelector,uParagraph);
 817    }
 818    return 0;
 819 }
 820
 821
 822 /***********************************************************************
 823  *           GlobalDOSFree      (KERNEL.185)
 824  *
 825  * Free memory allocated with GlobalDOSAlloc
 826  *
 827  * RETURNS
 828  *      NULL: Success
 829  *      sel: Failure
 830  */
 831 WORD WINAPI GlobalDOSFree16(
 832             WORD sel /* [in] Selector */
 833 ) {
 834    DWORD   block = GetSelectorBase(sel);
 835
 836    if( block && block < 0x100000 )
 837    {
 838        LPVOID lpBlock = DOSMEM_MapDosToLinear( block );
 839        if( DOSMEM_FreeBlock( lpBlock ) )
 840            GLOBAL_FreeBlock( sel );
 841        sel = 0;
 842    }
 843    return sel;
 844 }
 845
 846
 847 /***********************************************************************
 848  *           GlobalPageLock   (KERNEL.191)
 849  *           GlobalSmartPageLock(KERNEL.230)
 850  */
 851 WORD WINAPI GlobalPageLock16( HGLOBAL16 handle )
 852 {
 853     TRACE("%04x\n", handle );
 854     if (!VALID_HANDLE(handle)) {
 855         WARN("Invalid handle 0x%04x passed to GlobalPageLock!\n",handle);
 856         return 0;
 857     }
 858     return ++(GET_ARENA_PTR(handle)->pageLockCount);
 859 }
 860
 861
 862 /***********************************************************************
 863  *           GlobalPageUnlock   (KERNEL.192)
 864  *           GlobalSmartPageUnlock(KERNEL.231)
 865  */
 866 WORD WINAPI GlobalPageUnlock16( HGLOBAL16 handle )
 867 {
 868     TRACE("%04x\n", handle );
 869     if (!VALID_HANDLE(handle)) {
 870         WARN("Invalid handle 0x%04x passed to GlobalPageUnlock!\n",handle);
 871         return 0;
 872     }
 873     return --(GET_ARENA_PTR(handle)->pageLockCount);
 874 }
 875
 876
 877 /***********************************************************************
 878  *           GlobalFix     (KERNEL.197)
 879  *           GlobalFix16   (KERNEL32.27)
 880  */
 881 WORD WINAPI GlobalFix16( HGLOBAL16 handle )
 882 {
 883     TRACE("%04x\n", handle );
 884     if (!VALID_HANDLE(handle)) {
 885         WARN("Invalid handle 0x%04x passed to GlobalFix16!\n",handle);
 886         return 0;
 887     }
 888     GET_ARENA_PTR(handle)->lockCount++;
 889
 890     return GlobalHandleToSel16(handle);
 891 }
 892
 893
 894 /***********************************************************************
 895  *           GlobalUnfix     (KERNEL.198)
 896  *           GlobalUnfix16   (KERNEL32.28)
 897  */
 898 void WINAPI GlobalUnfix16( HGLOBAL16 handle )
 899 {
 900     TRACE("%04x\n", handle );
 901     if (!VALID_HANDLE(handle)) {
 902         WARN("Invalid handle 0x%04x passed to GlobalUnfix16!\n",handle);
 903         return;
 904     }
 905     GET_ARENA_PTR(handle)->lockCount--;
 906 }
 907
 908
 909 /***********************************************************************
 910  *           FarSetOwner   (KERNEL.403)
 911  */
 912 void WINAPI FarSetOwner16( HGLOBAL16 handle, HANDLE16 hOwner )
 913 {
 914     if (!VALID_HANDLE(handle)) {
 915         WARN("Invalid handle 0x%04x passed to FarSetOwner!\n",handle);
 916         return;
 917     }
 918     GET_ARENA_PTR(handle)->hOwner = hOwner;
 919 }
 920
 921
 922 /***********************************************************************
 923  *           FarGetOwner   (KERNEL.404)
 924  */
 925 HANDLE16 WINAPI FarGetOwner16( HGLOBAL16 handle )
 926 {
 927     if (!VALID_HANDLE(handle)) {
 928         WARN("Invalid handle 0x%04x passed to FarGetOwner!\n",handle);
 929         return 0;
 930     }
 931     return GET_ARENA_PTR(handle)->hOwner;
 932 }
 933
 934
 935 /************************************************************************
 936  *              GlobalMasterHandle (KERNEL.28)
 937  *
 938  *
 939  * Should return selector and handle of the information structure for
 940  * the global heap. selector and handle are stored in the THHOOK as
 941  * pGlobalHeap and hGlobalHeap.
 942  * As Wine doesn't have this structure, we return both values as zero
 943  * Applications should interpret this as "No Global Heap"
 944  */
 945 DWORD WINAPI GlobalMasterHandle16(void)
 946 {
 947     FIXME(": stub\n");
 948     return 0;
 949 }
 950
 951 /***********************************************************************
 952  *           GlobalHandleToSel   (TOOLHELP.50)
 953  *
 954  * FIXME: This is in TOOLHELP but we keep a copy here for now.
 955  */
 956 WORD WINAPI GlobalHandleToSel16( HGLOBAL16 handle )
 957 {
 958     if (!handle) return 0;
 959     if (!VALID_HANDLE(handle)) {
 960         WARN("Invalid handle 0x%04x passed to GlobalHandleToSel!\n",handle);
 961         return 0;
 962     }
 963     if (!(handle & 7))
 964     {
 965         WARN("Program attempted invalid selector conversion\n" );
 966         return handle - 1;
 967     }
 968     return handle | 7;
 969 }
 970
 971
 972 /***********************************************************************
 973  *           GetFreeMemInfo   (KERNEL.316)
 974  */
 975 DWORD WINAPI GetFreeMemInfo16(void)
 976 {
 977     MEMORYSTATUS status;
 978     GlobalMemoryStatus( &status );
 979     return MAKELONG( status.dwTotalVirtual/getpagesize(), status.dwAvailVirtual/getpagesize() );
 980 }
 981
 982 /***********************************************************************
 983  *           A20Proc   (KERNEL.165)
 984  */
 985 void WINAPI A20Proc16( WORD unused )
 986 {
 987     /* this is also a NOP in Windows */
 988 }
 989
 990 /***********************************************************************
 991  *           LimitEMSPages   (KERNEL.156)
 992  */
 993 DWORD WINAPI LimitEMSPages16( DWORD unused )
 994 {
 995     return 0;
 996 }