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 "toolhelp.h"
  42 #include "winternl.h"
  43 #include "kernel_private.h"
  44 #include "kernel16_private.h"
  45 #include "wine/debug.h"
  46
  47 WINE_DEFAULT_DEBUG_CHANNEL(global);
  48
  49   /* Global arena block */
  50 typedef struct
  51 {
  52     void     *base;          /* Base address (0 if discarded) */
  53     DWORD     size;          /* Size in bytes (0 indicates a free block) */
  54     HGLOBAL16 handle;        /* Handle for this block */
  55     HGLOBAL16 hOwner;        /* Owner of this block */
  56     BYTE      lockCount;     /* Count of GlobalFix() calls */
  57     BYTE      pageLockCount; /* Count of GlobalPageLock() calls */
  58     BYTE      flags;         /* Allocation flags */
  59     BYTE      selCount;      /* Number of selectors allocated for this block */
  60 } GLOBALARENA;
  61
  62   /* Flags definitions */
  63 #define GA_MOVEABLE     0x02  /* same as GMEM_MOVEABLE */
  64 #define GA_DGROUP       0x04
  65 #define GA_DISCARDABLE  0x08
  66 #define GA_IPCSHARE     0x10  /* same as GMEM_DDESHARE */
  67 #define GA_DOSMEM       0x20
  68
  69 /* Arena array (FIXME) */
  70 static GLOBALARENA *pGlobalArena;
  71 static int globalArenaSize;
  72
  73 #define GLOBAL_MAX_ALLOC_SIZE 0x00ff0000  /* Largest allocation is 16M - 64K */
  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         GLOBALARENA *pNewArena = realloc( pGlobalArena,
 117                                           newsize * sizeof(GLOBALARENA) );
 118         if (!pNewArena) return 0;
 119         pGlobalArena = pNewArena;
 120         memset( pGlobalArena + globalArenaSize, 0,
 121                 (newsize - globalArenaSize) * sizeof(GLOBALARENA) );
 122         globalArenaSize = newsize;
 123     }
 124     return pGlobalArena + (sel >> __AHSHIFT);
 125 }
 126
 127 void debug_handles(void)
 128 {
 129     int printed=0;
 130     int i;
 131     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 132         if (pGlobalArena[i].size!=0 && (pGlobalArena[i].handle & 0x8000)){
 133             printed=1;
 134             DPRINTF("0x%08x, ",pGlobalArena[i].handle);
 135         }
 136     }
 137     if (printed)
 138         DPRINTF("\n");
 139 }
 140
 141
 142 /***********************************************************************
 143  *           GLOBAL_CreateBlock
 144  *
 145  * Create a global heap block for a fixed range of linear memory.
 146  */
 147 HGLOBAL16 GLOBAL_CreateBlock( WORD flags, void *ptr, DWORD size,
 148                               HGLOBAL16 hOwner, unsigned char selflags )
 149 {
 150     WORD sel, selcount;
 151     GLOBALARENA *pArena;
 152
 153       /* Allocate the selector(s) */
 154
 155     sel = SELECTOR_AllocBlock( ptr, size, selflags );
 156     if (!sel) return 0;
 157     selcount = (size + 0xffff) / 0x10000;
 158
 159     if (!(pArena = GLOBAL_GetArena( sel, selcount )))
 160     {
 161         SELECTOR_FreeBlock( sel );
 162         return 0;
 163     }
 164
 165       /* Fill the arena block */
 166
 167     pArena->base = ptr;
 168     pArena->size = GetSelectorLimit16(sel) + 1;
 169     pArena->handle = (flags & GMEM_MOVEABLE) ? sel - 1 : sel;
 170     pArena->hOwner = hOwner;
 171     pArena->lockCount = 0;
 172     pArena->pageLockCount = 0;
 173     pArena->flags = flags & GA_MOVEABLE;
 174     if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 175     if (flags & GMEM_DDESHARE) pArena->flags |= GA_IPCSHARE;
 176     if (!(selflags & (WINE_LDT_FLAGS_CODE^WINE_LDT_FLAGS_DATA))) pArena->flags |= GA_DGROUP;
 177     pArena->selCount = selcount;
 178     if (selcount > 1)  /* clear the next arena blocks */
 179         memset( pArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 180
 181     return pArena->handle;
 182 }
 183
 184
 185 /***********************************************************************
 186  *           GLOBAL_FreeBlock
 187  *
 188  * Free a block allocated by GLOBAL_CreateBlock, without touching
 189  * the associated linear memory range.
 190  */
 191 BOOL16 GLOBAL_FreeBlock( HGLOBAL16 handle )
 192 {
 193     WORD sel;
 194     GLOBALARENA *pArena;
 195
 196     if (!handle) return TRUE;
 197     sel = GlobalHandleToSel16( handle );
 198     if (!VALID_HANDLE(sel)) return FALSE;
 199     pArena = GET_ARENA_PTR(sel);
 200     SELECTOR_FreeBlock( sel );
 201     memset( pArena, 0, sizeof(GLOBALARENA) );
 202     return TRUE;
 203 }
 204
 205 /***********************************************************************
 206  *           GLOBAL_MoveBlock
 207  */
 208 BOOL16 GLOBAL_MoveBlock( HGLOBAL16 handle, void *ptr, DWORD size )
 209 {
 210     WORD sel;
 211     GLOBALARENA *pArena;
 212
 213     if (!handle) return TRUE;
 214     sel = GlobalHandleToSel16( handle );
 215     if (!VALID_HANDLE(sel)) return FALSE;
 216     pArena = GET_ARENA_PTR(sel);
 217     if (pArena->selCount != 1)
 218         return FALSE;
 219
 220     pArena->base = ptr;
 221     pArena->size = size;
 222     SELECTOR_ReallocBlock( sel, ptr, size );
 223     return TRUE;
 224 }
 225
 226 /***********************************************************************
 227  *           GLOBAL_Alloc
 228  *
 229  * Implementation of GlobalAlloc16()
 230  */
 231 HGLOBAL16 GLOBAL_Alloc( UINT16 flags, DWORD size, HGLOBAL16 hOwner, unsigned char selflags )
 232 {
 233     void *ptr;
 234     HGLOBAL16 handle;
 235
 236     TRACE("%d flags=%04x\n", size, flags );
 237
 238     /* If size is 0, create a discarded block */
 239
 240     if (size == 0) return GLOBAL_CreateBlock( flags, NULL, 1, hOwner, selflags );
 241
 242     /* Fixup the size */
 243
 244     if (size >= GLOBAL_MAX_ALLOC_SIZE - 0x1f) return 0;
 245     size = (size + 0x1f) & ~0x1f;
 246
 247     /* Allocate the linear memory */
 248     ptr = HeapAlloc( get_win16_heap(), 0, size );
 249       /* FIXME: free discardable blocks and try again? */
 250     if (!ptr) return 0;
 251
 252       /* Allocate the selector(s) */
 253
 254     handle = GLOBAL_CreateBlock( flags, ptr, size, hOwner, selflags );
 255     if (!handle)
 256     {
 257         HeapFree( get_win16_heap(), 0, ptr );
 258         return 0;
 259     }
 260
 261     if (flags & GMEM_ZEROINIT) memset( ptr, 0, size );
 262     return handle;
 263 }
 264
 265 /***********************************************************************
 266  *           GlobalAlloc     (KERNEL.15)
 267  *           GlobalAlloc16   (KERNEL32.24)
 268  *
 269  * Allocate a global memory object.
 270  *
 271  * RETURNS
 272  *      Handle: Success
 273  *      NULL: Failure
 274  */
 275 HGLOBAL16 WINAPI GlobalAlloc16(
 276                  UINT16 flags, /* [in] Object allocation attributes */
 277                  DWORD size    /* [in] Number of bytes to allocate */
 278 ) {
 279     HANDLE16 owner = GetCurrentPDB16();
 280
 281     if (flags & GMEM_DDESHARE)
 282         owner = GetExePtr(owner);  /* Make it a module handle */
 283     return GLOBAL_Alloc( flags, size, owner, WINE_LDT_FLAGS_DATA );
 284 }
 285
 286
 287 /***********************************************************************
 288  *           GlobalReAlloc     (KERNEL.16)
 289  *
 290  * Change the size or attributes of a global memory object.
 291  *
 292  * RETURNS
 293  *      Handle: Success
 294  *      NULL: Failure
 295  */
 296 HGLOBAL16 WINAPI GlobalReAlloc16(
 297                  HGLOBAL16 handle, /* [in] Handle of global memory object */
 298                  DWORD size,       /* [in] New size of block */
 299                  UINT16 flags      /* [in] How to reallocate object */
 300 ) {
 301     WORD selcount;
 302     DWORD oldsize;
 303     void *ptr, *newptr;
 304     GLOBALARENA *pArena, *pNewArena;
 305     WORD sel = GlobalHandleToSel16( handle );
 306     HANDLE heap = get_win16_heap();
 307
 308     TRACE("%04x %d flags=%04x\n",
 309                     handle, size, flags );
 310     if (!handle) return 0;
 311
 312     if (!VALID_HANDLE(handle))
 313     {
 314         WARN("Invalid handle 0x%04x!\n", handle);
 315         return 0;
 316     }
 317     pArena = GET_ARENA_PTR( handle );
 318
 319       /* Discard the block if requested */
 320
 321     if ((size == 0) && (flags & GMEM_MOVEABLE) && !(flags & GMEM_MODIFY))
 322     {
 323         if (!(pArena->flags & GA_MOVEABLE) ||
 324             !(pArena->flags & GA_DISCARDABLE) ||
 325             (pArena->lockCount > 0) || (pArena->pageLockCount > 0)) return 0;
 326         if (pArena->flags & GA_DOSMEM)
 327             DOSMEM_FreeBlock( pArena->base );
 328         else
 329             HeapFree( heap, 0, pArena->base );
 330         pArena->base = 0;
 331
 332         /* Note: we rely on the fact that SELECTOR_ReallocBlock won't
 333          * change the selector if we are shrinking the block.
 334          * FIXME: shouldn't we keep selectors until the block is deleted?
 335          */
 336         SELECTOR_ReallocBlock( sel, 0, 1 );
 337         return handle;
 338     }
 339
 340       /* Fixup the size */
 341
 342     if (size > GLOBAL_MAX_ALLOC_SIZE - 0x20) return 0;
 343     if (size == 0) size = 0x20;
 344     else size = (size + 0x1f) & ~0x1f;
 345
 346       /* Change the flags */
 347
 348     if (flags & GMEM_MODIFY)
 349     {
 350           /* Change the flags, leaving GA_DGROUP alone */
 351         pArena->flags = (pArena->flags & GA_DGROUP) | (flags & GA_MOVEABLE);
 352         if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 353         return handle;
 354     }
 355
 356       /* Reallocate the linear memory */
 357
 358     ptr = pArena->base;
 359     oldsize = pArena->size;
 360     TRACE("oldbase %p oldsize %08x newsize %08x\n", ptr,oldsize,size);
 361     if (ptr && (size == oldsize)) return handle;  /* Nothing to do */
 362
 363     if (pArena->flags & GA_DOSMEM)
 364     {
 365         if (DOSMEM_ResizeBlock(ptr, size, TRUE) == size)
 366             newptr = ptr;
 367         else if(pArena->pageLockCount > 0)
 368             newptr = 0;
 369         else
 370         {
 371             newptr = DOSMEM_AllocBlock( size, 0 );
 372             if (newptr)
 373             {
 374                 memcpy( newptr, ptr, oldsize );
 375                 DOSMEM_FreeBlock( ptr );
 376             }
 377         }
 378     }
 379     else
 380     {
 381         /*
 382          * if more than one reader (e.g. some pointer has been
 383          * given out by GetVDMPointer32W16),
 384          * only try to realloc in place
 385          */
 386
 387         if (ptr)
 388             newptr = HeapReAlloc( heap,
 389                 (pArena->pageLockCount > 0) ? HEAP_REALLOC_IN_PLACE_ONLY : 0,
 390                               ptr, size );
 391         else
 392             newptr = HeapAlloc( heap, 0, size );
 393
 394     }
 395
 396     if (!newptr)
 397     {
 398         FIXME("Realloc failed lock %d\n",pArena->pageLockCount);
 399         if (pArena->pageLockCount <1)
 400         {
 401             if (pArena->flags & GA_DOSMEM)
 402                 DOSMEM_FreeBlock( pArena->base );
 403             else
 404                 HeapFree( heap, 0, ptr );
 405             SELECTOR_FreeBlock( sel );
 406             memset( pArena, 0, sizeof(GLOBALARENA) );
 407         }
 408         return 0;
 409     }
 410     ptr = newptr;
 411
 412       /* Reallocate the selector(s) */
 413
 414     sel = SELECTOR_ReallocBlock( sel, ptr, size );
 415     if (!sel)
 416     {
 417         if (pArena->flags & GA_DOSMEM)
 418             DOSMEM_FreeBlock( pArena->base );
 419         else
 420             HeapFree( heap, 0, ptr );
 421         memset( pArena, 0, sizeof(GLOBALARENA) );
 422         return 0;
 423     }
 424     selcount = (size + 0xffff) / 0x10000;
 425
 426     if (!(pNewArena = GLOBAL_GetArena( sel, selcount )))
 427     {
 428         if (pArena->flags & GA_DOSMEM)
 429             DOSMEM_FreeBlock( pArena->base );
 430         else
 431             HeapFree( heap, 0, ptr );
 432         SELECTOR_FreeBlock( sel );
 433         return 0;
 434     }
 435
 436       /* Fill the new arena block
 437          As we may have used HEAP_REALLOC_IN_PLACE_ONLY, areas may overlap*/
 438
 439     if (pNewArena != pArena) memmove( pNewArena, pArena, sizeof(GLOBALARENA) );
 440     pNewArena->base = ptr;
 441     pNewArena->size = GetSelectorLimit16(sel) + 1;
 442     pNewArena->selCount = selcount;
 443     pNewArena->handle = (pNewArena->flags & GA_MOVEABLE) ? sel - 1 : sel;
 444
 445     if (selcount > 1)  /* clear the next arena blocks */
 446         memset( pNewArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 447
 448     if ((oldsize < size) && (flags & GMEM_ZEROINIT))
 449         memset( (char *)ptr + oldsize, 0, size - oldsize );
 450     return pNewArena->handle;
 451 }
 452
 453
 454 /***********************************************************************
 455  *           GlobalFree     (KERNEL.17)
 456  *           GlobalFree16   (KERNEL32.31)
 457  * RETURNS
 458  *      NULL: Success
 459  *      Handle: Failure
 460  */
 461 HGLOBAL16 WINAPI GlobalFree16(
 462                  HGLOBAL16 handle /* [in] Handle of global memory object */
 463 ) {
 464     void *ptr;
 465
 466     if (!VALID_HANDLE(handle))
 467     {
 468         WARN("Invalid handle 0x%04x passed to GlobalFree16!\n",handle);
 469         return 0;
 470     }
 471     ptr = GET_ARENA_PTR(handle)->base;
 472
 473     TRACE("%04x\n", handle );
 474     if (!GLOBAL_FreeBlock( handle )) return handle;  /* failed */
 475     HeapFree( get_win16_heap(), 0, ptr );
 476     return 0;
 477 }
 478
 479
 480 /**********************************************************************
 481  *           K32WOWGlobalLock16         (KERNEL32.60)
 482  */
 483 SEGPTR WINAPI K32WOWGlobalLock16( HGLOBAL16 handle )
 484 {
 485     WORD sel = GlobalHandleToSel16( handle );
 486     TRACE("(%04x) -> %08x\n", handle, MAKELONG( 0, sel ) );
 487
 488     if (handle)
 489     {
 490         if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 491
 492         if (!VALID_HANDLE(handle)) {
 493             WARN("Invalid handle 0x%04x passed to WIN16_GlobalLock16!\n",handle);
 494             sel = 0;
 495         }
 496         else if (!GET_ARENA_PTR(handle)->base)
 497             sel = 0;
 498         else
 499             GET_ARENA_PTR(handle)->lockCount++;
 500     }
 501
 502     return MAKESEGPTR( sel, 0 );
 503
 504 }
 505
 506
 507 /***********************************************************************
 508  *           GlobalLock   (KERNEL.18)
 509  *
 510  * This is the GlobalLock16() function used by 16-bit code.
 511  */
 512 SEGPTR WINAPI WIN16_GlobalLock16( HGLOBAL16 handle )
 513 {
 514     SEGPTR ret = K32WOWGlobalLock16( handle );
 515     CURRENT_STACK16->ecx = SELECTOROF(ret);  /* selector must be returned in CX as well */
 516     return ret;
 517 }
 518
 519
 520 /***********************************************************************
 521  *           GlobalLock16   (KERNEL32.25)
 522  *
 523  * This is the GlobalLock16() function used by 32-bit code.
 524  *
 525  * RETURNS
 526  *      Pointer to first byte of memory block
 527  *      NULL: Failure
 528  */
 529 LPVOID WINAPI GlobalLock16(
 530               HGLOBAL16 handle /* [in] Handle of global memory object */
 531 ) {
 532     if (!handle) return 0;
 533     if (!VALID_HANDLE(handle))
 534         return 0;
 535     GET_ARENA_PTR(handle)->lockCount++;
 536     return GET_ARENA_PTR(handle)->base;
 537 }
 538
 539
 540 /***********************************************************************
 541  *           GlobalUnlock     (KERNEL.19)
 542  *           GlobalUnlock16   (KERNEL32.26)
 543  * NOTES
 544  *      Should the return values be cast to booleans?
 545  *
 546  * RETURNS
 547  *      TRUE: Object is still locked
 548  *      FALSE: Object is unlocked
 549  */
 550 BOOL16 WINAPI GlobalUnlock16(
 551               HGLOBAL16 handle /* [in] Handle of global memory object */
 552 ) {
 553     GLOBALARENA *pArena = GET_ARENA_PTR(handle);
 554     if (!VALID_HANDLE(handle)) {
 555         WARN("Invalid handle 0x%04x passed to GlobalUnlock16!\n",handle);
 556         return 0;
 557     }
 558     TRACE("%04x\n", handle );
 559     if (pArena->lockCount) pArena->lockCount--;
 560     return pArena->lockCount;
 561 }
 562
 563 /***********************************************************************
 564  *     GlobalChangeLockCount               (KERNEL.365)
 565  *
 566  * This is declared as a register function as it has to preserve
 567  * *all* registers, even AX/DX !
 568  *
 569  */
 570 void WINAPI GlobalChangeLockCount16( HGLOBAL16 handle, INT16 delta,
 571                                      CONTEXT86 *context )
 572 {
 573     if ( delta == 1 )
 574         GlobalLock16( handle );
 575     else if ( delta == -1 )
 576         GlobalUnlock16( handle );
 577     else
 578         ERR("(%04X, %d): strange delta value\n", handle, delta );
 579 }
 580
 581 /***********************************************************************
 582  *           GlobalSize     (KERNEL.20)
 583  *           GlobalSize16   (KERNEL32.32)
 584  *
 585  * Get the current size of a global memory object.
 586  *
 587  * RETURNS
 588  *      Size in bytes of object
 589  *      0: Failure
 590  */
 591 DWORD WINAPI GlobalSize16(
 592              HGLOBAL16 handle /* [in] Handle of global memory object */
 593 ) {
 594     TRACE("%04x\n", handle );
 595     if (!handle) return 0;
 596     if (!VALID_HANDLE(handle))
 597         return 0;
 598     return GET_ARENA_PTR(handle)->size;
 599 }
 600
 601
 602 /***********************************************************************
 603  *           GlobalHandle   (KERNEL.21)
 604  *
 605  * Get the handle associated with a pointer to the global memory block.
 606  *
 607  * NOTES
 608  *      Why is GlobalHandleToSel used here with the sel as input?
 609  *
 610  * RETURNS
 611  *      Handle: Success
 612  *      NULL: Failure
 613  */
 614 DWORD WINAPI GlobalHandle16(
 615              WORD sel /* [in] Address of global memory block */
 616 ) {
 617     TRACE("%04x\n", sel );
 618     if (!VALID_HANDLE(sel)) {
 619         WARN("Invalid handle 0x%04x passed to GlobalHandle16!\n",sel);
 620         return 0;
 621     }
 622     return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 623 }
 624
 625 /***********************************************************************
 626  *           GlobalHandleNoRIP   (KERNEL.159)
 627  */
 628 DWORD WINAPI GlobalHandleNoRIP16( WORD sel )
 629 {
 630     int i;
 631     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 632         if (pGlobalArena[i].size!=0 && pGlobalArena[i].handle == sel)
 633                 return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 634     }
 635     return 0;
 636 }
 637
 638
 639 /***********************************************************************
 640  *           GlobalFlags     (KERNEL.22)
 641  *
 642  * Get information about a global memory object.
 643  *
 644  * NOTES
 645  *      Should this return GMEM_INVALID_HANDLE instead of 0 on invalid
 646  *      handle?
 647  *
 648  * RETURNS
 649  *      Value specifying flags and lock count
 650  *      GMEM_INVALID_HANDLE: Invalid handle
 651  */
 652 UINT16 WINAPI GlobalFlags16(
 653               HGLOBAL16 handle /* [in] Handle of global memory object */
 654 ) {
 655     GLOBALARENA *pArena;
 656
 657     TRACE("%04x\n", handle );
 658     if (!VALID_HANDLE(handle)) {
 659         WARN("Invalid handle 0x%04x passed to GlobalFlags16!\n",handle);
 660         return 0;
 661     }
 662     pArena = GET_ARENA_PTR(handle);
 663     return pArena->lockCount |
 664            ((pArena->flags & GA_DISCARDABLE) ? GMEM_DISCARDABLE : 0) |
 665            ((pArena->base == 0) ? GMEM_DISCARDED : 0);
 666 }
 667
 668
 669 /***********************************************************************
 670  *           LockSegment   (KERNEL.23)
 671  */
 672 HGLOBAL16 WINAPI LockSegment16( HGLOBAL16 handle )
 673 {
 674     TRACE("%04x\n", handle );
 675     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 676     if (!VALID_HANDLE(handle)) {
 677         WARN("Invalid handle 0x%04x passed to LockSegment16!\n",handle);
 678         return 0;
 679     }
 680     GET_ARENA_PTR(handle)->lockCount++;
 681     return handle;
 682 }
 683
 684
 685 /***********************************************************************
 686  *           UnlockSegment   (KERNEL.24)
 687  */
 688 void WINAPI UnlockSegment16( HGLOBAL16 handle )
 689 {
 690     TRACE("%04x\n", handle );
 691     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 692     if (!VALID_HANDLE(handle)) {
 693         WARN("Invalid handle 0x%04x passed to UnlockSegment16!\n",handle);
 694         return;
 695     }
 696     GET_ARENA_PTR(handle)->lockCount--;
 697     /* FIXME: this ought to return the lock count in CX (go figure...) */
 698 }
 699
 700
 701 /***********************************************************************
 702  *           GlobalCompact   (KERNEL.25)
 703  */
 704 DWORD WINAPI GlobalCompact16( DWORD desired )
 705 {
 706     return GLOBAL_MAX_ALLOC_SIZE;
 707 }
 708
 709
 710 /***********************************************************************
 711  *           GlobalFreeAll   (KERNEL.26)
 712  */
 713 void WINAPI GlobalFreeAll16( HGLOBAL16 owner )
 714 {
 715     int i;
 716     GLOBALARENA *pArena;
 717
 718     pArena = pGlobalArena;
 719     for (i = 0; i < globalArenaSize; i++, pArena++)
 720     {
 721         if ((pArena->size != 0) && (pArena->hOwner == owner))
 722             GlobalFree16( pArena->handle );
 723     }
 724 }
 725
 726
 727 /***********************************************************************
 728  *           GlobalWire     (KERNEL.111)
 729  *           GlobalWire16   (KERNEL32.29)
 730  */
 731 SEGPTR WINAPI GlobalWire16( HGLOBAL16 handle )
 732 {
 733     return WIN16_GlobalLock16( handle );
 734 }
 735
 736
 737 /***********************************************************************
 738  *           GlobalUnWire     (KERNEL.112)
 739  *           GlobalUnWire16   (KERNEL32.30)
 740  */
 741 BOOL16 WINAPI GlobalUnWire16( HGLOBAL16 handle )
 742 {
 743     return !GlobalUnlock16( handle );
 744 }
 745
 746
 747 /***********************************************************************
 748  *           SetSwapAreaSize   (KERNEL.106)
 749  */
 750 LONG WINAPI SetSwapAreaSize16( WORD size )
 751 {
 752     FIXME("(%d) - stub!\n", size );
 753     return MAKELONG( size, 0xffff );
 754 }
 755
 756
 757 /***********************************************************************
 758  *           GlobalLRUOldest   (KERNEL.163)
 759  */
 760 HGLOBAL16 WINAPI GlobalLRUOldest16( HGLOBAL16 handle )
 761 {
 762     TRACE("%04x\n", handle );
 763     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 764     return handle;
 765 }
 766
 767
 768 /***********************************************************************
 769  *           GlobalLRUNewest   (KERNEL.164)
 770  */
 771 HGLOBAL16 WINAPI GlobalLRUNewest16( HGLOBAL16 handle )
 772 {
 773     TRACE("%04x\n", handle );
 774     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 775     return handle;
 776 }
 777
 778
 779 /***********************************************************************
 780  *           GetFreeSpace   (KERNEL.169)
 781  */
 782 DWORD WINAPI GetFreeSpace16( UINT16 wFlags )
 783 {
 784     MEMORYSTATUS ms;
 785     GlobalMemoryStatus( &ms );
 786     return ms.dwAvailVirtual;
 787 }
 788
 789 /***********************************************************************
 790  *           GlobalDOSAlloc   (KERNEL.184)
 791  *
 792  * Allocate memory in the first MB.
 793  *
 794  * RETURNS
 795  *      Address (HW=Paragraph segment; LW=Selector)
 796  */
 797 DWORD WINAPI GlobalDOSAlloc16(
 798              DWORD size /* [in] Number of bytes to be allocated */
 799 ) {
 800    UINT16    uParagraph;
 801    LPVOID    lpBlock = DOSMEM_AllocBlock( size, &uParagraph );
 802
 803    if( lpBlock )
 804    {
 805        HMODULE16 hModule = GetModuleHandle16("KERNEL");
 806        WORD      wSelector;
 807        GLOBALARENA *pArena;
 808
 809        wSelector = GLOBAL_CreateBlock(GMEM_FIXED, lpBlock, size, hModule, WINE_LDT_FLAGS_DATA );
 810        pArena = GET_ARENA_PTR(wSelector);
 811        pArena->flags |= GA_DOSMEM;
 812        return MAKELONG(wSelector,uParagraph);
 813    }
 814    return 0;
 815 }
 816
 817
 818 /***********************************************************************
 819  *           GlobalDOSFree      (KERNEL.185)
 820  *
 821  * Free memory allocated with GlobalDOSAlloc
 822  *
 823  * RETURNS
 824  *      NULL: Success
 825  *      sel: Failure
 826  */
 827 WORD WINAPI GlobalDOSFree16(
 828             WORD sel /* [in] Selector */
 829 ) {
 830    DWORD   block = GetSelectorBase(sel);
 831
 832    if( block && block < 0x100000 )
 833    {
 834        LPVOID lpBlock = DOSMEM_MapDosToLinear( block );
 835        if( DOSMEM_FreeBlock( lpBlock ) )
 836            GLOBAL_FreeBlock( sel );
 837        sel = 0;
 838    }
 839    return sel;
 840 }
 841
 842
 843 /***********************************************************************
 844  *           GlobalPageLock   (KERNEL.191)
 845  *           GlobalSmartPageLock(KERNEL.230)
 846  */
 847 WORD WINAPI GlobalPageLock16( HGLOBAL16 handle )
 848 {
 849     TRACE("%04x\n", handle );
 850     if (!VALID_HANDLE(handle)) {
 851         WARN("Invalid handle 0x%04x passed to GlobalPageLock!\n",handle);
 852         return 0;
 853     }
 854     return ++(GET_ARENA_PTR(handle)->pageLockCount);
 855 }
 856
 857
 858 /***********************************************************************
 859  *           GlobalPageUnlock   (KERNEL.192)
 860  *           GlobalSmartPageUnlock(KERNEL.231)
 861  */
 862 WORD WINAPI GlobalPageUnlock16( HGLOBAL16 handle )
 863 {
 864     TRACE("%04x\n", handle );
 865     if (!VALID_HANDLE(handle)) {
 866         WARN("Invalid handle 0x%04x passed to GlobalPageUnlock!\n",handle);
 867         return 0;
 868     }
 869     return --(GET_ARENA_PTR(handle)->pageLockCount);
 870 }
 871
 872
 873 /***********************************************************************
 874  *           GlobalFix     (KERNEL.197)
 875  *           GlobalFix16   (KERNEL32.27)
 876  */
 877 WORD WINAPI GlobalFix16( HGLOBAL16 handle )
 878 {
 879     TRACE("%04x\n", handle );
 880     if (!VALID_HANDLE(handle)) {
 881         WARN("Invalid handle 0x%04x passed to GlobalFix16!\n",handle);
 882         return 0;
 883     }
 884     GET_ARENA_PTR(handle)->lockCount++;
 885
 886     return GlobalHandleToSel16(handle);
 887 }
 888
 889
 890 /***********************************************************************
 891  *           GlobalUnfix     (KERNEL.198)
 892  *           GlobalUnfix16   (KERNEL32.28)
 893  */
 894 void WINAPI GlobalUnfix16( HGLOBAL16 handle )
 895 {
 896     TRACE("%04x\n", handle );
 897     if (!VALID_HANDLE(handle)) {
 898         WARN("Invalid handle 0x%04x passed to GlobalUnfix16!\n",handle);
 899         return;
 900     }
 901     GET_ARENA_PTR(handle)->lockCount--;
 902 }
 903
 904
 905 /***********************************************************************
 906  *           FarSetOwner   (KERNEL.403)
 907  */
 908 void WINAPI FarSetOwner16( HGLOBAL16 handle, HANDLE16 hOwner )
 909 {
 910     if (!VALID_HANDLE(handle)) {
 911         WARN("Invalid handle 0x%04x passed to FarSetOwner!\n",handle);
 912         return;
 913     }
 914     GET_ARENA_PTR(handle)->hOwner = hOwner;
 915 }
 916
 917
 918 /***********************************************************************
 919  *           FarGetOwner   (KERNEL.404)
 920  */
 921 HANDLE16 WINAPI FarGetOwner16( HGLOBAL16 handle )
 922 {
 923     if (!VALID_HANDLE(handle)) {
 924         WARN("Invalid handle 0x%04x passed to FarGetOwner!\n",handle);
 925         return 0;
 926     }
 927     return GET_ARENA_PTR(handle)->hOwner;
 928 }
 929
 930
 931 /************************************************************************
 932  *              GlobalMasterHandle (KERNEL.28)
 933  *
 934  *
 935  * Should return selector and handle of the information structure for
 936  * the global heap. selector and handle are stored in the THHOOK as
 937  * pGlobalHeap and hGlobalHeap.
 938  * As Wine doesn't have this structure, we return both values as zero
 939  * Applications should interpret this as "No Global Heap"
 940  */
 941 DWORD WINAPI GlobalMasterHandle16(void)
 942 {
 943     FIXME(": stub\n");
 944     return 0;
 945 }
 946
 947 /***********************************************************************
 948  *           GlobalHandleToSel   (TOOLHELP.50)
 949  */
 950 WORD WINAPI GlobalHandleToSel16( HGLOBAL16 handle )
 951 {
 952     if (!handle) return 0;
 953     if (!VALID_HANDLE(handle)) {
 954         WARN("Invalid handle 0x%04x passed to GlobalHandleToSel!\n",handle);
 955         return 0;
 956     }
 957     if (!(handle & 7))
 958     {
 959         WARN("Program attempted invalid selector conversion\n" );
 960         return handle - 1;
 961     }
 962     return handle | 7;
 963 }
 964
 965
 966 /***********************************************************************
 967  *           GlobalFirst   (TOOLHELP.51)
 968  */
 969 BOOL16 WINAPI GlobalFirst16( GLOBALENTRY *pGlobal, WORD wFlags )
 970 {
 971     if (wFlags == GLOBAL_LRU) return FALSE;
 972     pGlobal->dwNext = 0;
 973     return GlobalNext16( pGlobal, wFlags );
 974 }
 975
 976
 977 /***********************************************************************
 978  *           GlobalNext   (TOOLHELP.52)
 979  */
 980 BOOL16 WINAPI GlobalNext16( GLOBALENTRY *pGlobal, WORD wFlags)
 981 {
 982     GLOBALARENA *pArena;
 983
 984     if (pGlobal->dwNext >= globalArenaSize) return FALSE;
 985     pArena = pGlobalArena + pGlobal->dwNext;
 986     if (wFlags == GLOBAL_FREE)  /* only free blocks */
 987     {
 988         int i;
 989         for (i = pGlobal->dwNext; i < globalArenaSize; i++, pArena++)
 990             if (pArena->size == 0) break;  /* block is free */
 991         if (i >= globalArenaSize) return FALSE;
 992         pGlobal->dwNext = i;
 993     }
 994
 995     pGlobal->dwAddress    = (DWORD_PTR)pArena->base;
 996     pGlobal->dwBlockSize  = pArena->size;
 997     pGlobal->hBlock       = pArena->handle;
 998     pGlobal->wcLock       = pArena->lockCount;
 999     pGlobal->wcPageLock   = pArena->pageLockCount;
1000     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
1001     pGlobal->wHeapPresent = FALSE;
1002     pGlobal->hOwner       = pArena->hOwner;
1003     pGlobal->wType        = GT_UNKNOWN;
1004     pGlobal->wData        = 0;
1005     pGlobal->dwNext++;
1006     return TRUE;
1007 }
1008
1009
1010 /***********************************************************************
1011  *           GlobalInfo   (TOOLHELP.53)
1012  */
1013 BOOL16 WINAPI GlobalInfo16( GLOBALINFO *pInfo )
1014 {
1015     int i;
1016     GLOBALARENA *pArena;
1017
1018     pInfo->wcItems = globalArenaSize;
1019     pInfo->wcItemsFree = 0;
1020     pInfo->wcItemsLRU = 0;
1021     for (i = 0, pArena = pGlobalArena; i < globalArenaSize; i++, pArena++)
1022         if (pArena->size == 0) pInfo->wcItemsFree++;
1023     return TRUE;
1024 }
1025
1026
1027 /***********************************************************************
1028  *           GlobalEntryHandle   (TOOLHELP.54)
1029  */
1030 BOOL16 WINAPI GlobalEntryHandle16( GLOBALENTRY *pGlobal, HGLOBAL16 hItem )
1031 {
1032     GLOBALARENA *pArena = GET_ARENA_PTR(hItem);
1033
1034     pGlobal->dwAddress    = (DWORD_PTR)pArena->base;
1035     pGlobal->dwBlockSize  = pArena->size;
1036     pGlobal->hBlock       = pArena->handle;
1037     pGlobal->wcLock       = pArena->lockCount;
1038     pGlobal->wcPageLock   = pArena->pageLockCount;
1039     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
1040     pGlobal->wHeapPresent = FALSE;
1041     pGlobal->hOwner       = pArena->hOwner;
1042     pGlobal->wType        = GT_UNKNOWN;
1043     pGlobal->wData        = 0;
1044     pGlobal->dwNext++;
1045     return TRUE;
1046 }
1047
1048
1049 /***********************************************************************
1050  *           GlobalEntryModule   (TOOLHELP.55)
1051  */
1052 BOOL16 WINAPI GlobalEntryModule16( GLOBALENTRY *pGlobal, HMODULE16 hModule,
1053                                  WORD wSeg )
1054 {
1055     FIXME("(%p, 0x%04x, 0x%04x), stub.\n", pGlobal, hModule, wSeg);
1056     return FALSE;
1057 }
1058
1059
1060 /***********************************************************************
1061  *           MemManInfo   (TOOLHELP.72)
1062  */
1063 BOOL16 WINAPI MemManInfo16( MEMMANINFO *info )
1064 {
1065     MEMORYSTATUS status;
1066
1067     /*
1068      * Not unsurprisingly although the documentation says you
1069      * _must_ provide the size in the dwSize field, this function
1070      * (under Windows) always fills the structure and returns true.
1071      */
1072     GlobalMemoryStatus( &status );
1073     info->wPageSize            = getpagesize();
1074     info->dwLargestFreeBlock   = status.dwAvailVirtual;
1075     info->dwMaxPagesAvailable  = info->dwLargestFreeBlock / info->wPageSize;
1076     info->dwMaxPagesLockable   = info->dwMaxPagesAvailable;
1077     info->dwTotalLinearSpace   = status.dwTotalVirtual / info->wPageSize;
1078     info->dwTotalUnlockedPages = info->dwTotalLinearSpace;
1079     info->dwFreePages          = info->dwMaxPagesAvailable;
1080     info->dwTotalPages         = info->dwTotalLinearSpace;
1081     info->dwFreeLinearSpace    = info->dwMaxPagesAvailable;
1082     info->dwSwapFilePages      = status.dwTotalPageFile / info->wPageSize;
1083     return TRUE;
1084 }
1085
1086 /***********************************************************************
1087  *           GetFreeMemInfo   (KERNEL.316)
1088  */
1089 DWORD WINAPI GetFreeMemInfo16(void)
1090 {
1091     MEMMANINFO info;
1092     MemManInfo16( &info );
1093     return MAKELONG( info.dwTotalLinearSpace, info.dwMaxPagesAvailable );
1094 }
1095
1096 /***********************************************************************
1097  *           A20Proc   (KERNEL.165)
1098  */
1099 void WINAPI A20Proc16( WORD unused )
1100 {
1101     /* this is also a NOP in Windows */
1102 }
1103
1104 /***********************************************************************
1105  *           LimitEMSPages   (KERNEL.156)
1106  */
1107 DWORD WINAPI LimitEMSPages16( DWORD unused )
1108 {
1109     return 0;
1110 }