dlls/krnl386.exe16/global.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 "kernel16_private.h"
  43 #include "wine/debug.h"
  44
  45 WINE_DEFAULT_DEBUG_CHANNEL(global);
  46
  47   /* Global arena block */
  48 typedef struct
  49 {
  50     void     *base;          /* Base address (0 if discarded) */
  51     DWORD     size;          /* Size in bytes (0 indicates a free block) */
  52     HGLOBAL16 handle;        /* Handle for this block */
  53     HGLOBAL16 hOwner;        /* Owner of this block */
  54     BYTE      lockCount;     /* Count of GlobalFix() calls */
  55     BYTE      pageLockCount; /* Count of GlobalPageLock() calls */
  56     BYTE      flags;         /* Allocation flags */
  57     BYTE      selCount;      /* Number of selectors allocated for this block */
  58 } GLOBALARENA;
  59
  60   /* Flags definitions */
  61 #define GA_MOVEABLE     0x02  /* same as GMEM_MOVEABLE */
  62 #define GA_DGROUP       0x04
  63 #define GA_DISCARDABLE  0x08
  64 #define GA_IPCSHARE     0x10  /* same as GMEM_DDESHARE */
  65 #define GA_DOSMEM       0x20
  66
  67 /* Arena array (FIXME) */
  68 static GLOBALARENA *pGlobalArena;
  69 static int globalArenaSize;
  70
  71 #define GLOBAL_MAX_ALLOC_SIZE 0x00ff0000  /* Largest allocation is 16M - 64K */
  72 #define GLOBAL_MAX_COUNT      8192        /* Max number of allocated blocks */
  73
  74 #define VALID_HANDLE(handle) (((handle)>>__AHSHIFT)<globalArenaSize)
  75 #define GET_ARENA_PTR(handle)  (pGlobalArena + ((handle) >> __AHSHIFT))
  76
  77 static HANDLE get_win16_heap(void)
  78 {
  79     static HANDLE win16_heap;
  80
  81     /* we create global memory block with execute permission. The access can be limited
  82      * for 16-bit code on selector level */
  83     if (!win16_heap) win16_heap = HeapCreate(HEAP_CREATE_ENABLE_EXECUTE, 0, 0);
  84     return win16_heap;
  85 }
  86
  87 /***********************************************************************
  88  *           GLOBAL_GetArena
  89  *
  90  * Return the arena for a given selector, growing the arena array if needed.
  91  */
  92 static GLOBALARENA *GLOBAL_GetArena( WORD sel, WORD selcount )
  93 {
  94     if (((sel >> __AHSHIFT) + selcount) > globalArenaSize)
  95     {
  96         int newsize = ((sel >> __AHSHIFT) + selcount + 0xff) & ~0xff;
  97
  98         if (!pGlobalArena)
  99         {
 100             pGlobalArena = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
 101                                       GLOBAL_MAX_COUNT * sizeof(GLOBALARENA) );
 102             if (!pGlobalArena) return 0;
 103             /* Hack: store a pointer to it in THHOOK instead of a handle */
 104             *(GLOBALARENA **)&pThhook->hGlobalHeap = pGlobalArena;
 105         }
 106         if (newsize > GLOBAL_MAX_COUNT) return 0;
 107         globalArenaSize = newsize;
 108     }
 109     return pGlobalArena + (sel >> __AHSHIFT);
 110 }
 111
 112 void debug_handles(void)
 113 {
 114     int printed=0;
 115     int i;
 116     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 117         if (pGlobalArena[i].size!=0 && (pGlobalArena[i].handle & 0x8000)){
 118             printed=1;
 119             DPRINTF("0x%08x, ",pGlobalArena[i].handle);
 120         }
 121     }
 122     if (printed)
 123         DPRINTF("\n");
 124 }
 125
 126
 127 /***********************************************************************
 128  *           GLOBAL_CreateBlock
 129  *
 130  * Create a global heap block for a fixed range of linear memory.
 131  */
 132 HGLOBAL16 GLOBAL_CreateBlock( WORD flags, void *ptr, DWORD size,
 133                               HGLOBAL16 hOwner, unsigned char selflags )
 134 {
 135     WORD sel, selcount;
 136     GLOBALARENA *pArena;
 137
 138       /* Allocate the selector(s) */
 139
 140     sel = SELECTOR_AllocBlock( ptr, size, selflags );
 141     if (!sel) return 0;
 142     selcount = (size + 0xffff) / 0x10000;
 143
 144     if (!(pArena = GLOBAL_GetArena( sel, selcount )))
 145     {
 146         SELECTOR_FreeBlock( sel );
 147         return 0;
 148     }
 149
 150       /* Fill the arena block */
 151
 152     pArena->base = ptr;
 153     pArena->size = GetSelectorLimit16(sel) + 1;
 154     pArena->handle = (flags & GMEM_MOVEABLE) ? sel - 1 : sel;
 155     pArena->hOwner = hOwner;
 156     pArena->lockCount = 0;
 157     pArena->pageLockCount = 0;
 158     pArena->flags = flags & GA_MOVEABLE;
 159     if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 160     if (flags & GMEM_DDESHARE) pArena->flags |= GA_IPCSHARE;
 161     if (!(selflags & (WINE_LDT_FLAGS_CODE^WINE_LDT_FLAGS_DATA))) pArena->flags |= GA_DGROUP;
 162     pArena->selCount = selcount;
 163     if (selcount > 1)  /* clear the next arena blocks */
 164         memset( pArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 165
 166     return pArena->handle;
 167 }
 168
 169
 170 /***********************************************************************
 171  *           GLOBAL_FreeBlock
 172  *
 173  * Free a block allocated by GLOBAL_CreateBlock, without touching
 174  * the associated linear memory range.
 175  */
 176 BOOL16 GLOBAL_FreeBlock( HGLOBAL16 handle )
 177 {
 178     WORD sel;
 179     GLOBALARENA *pArena;
 180
 181     if (!handle) return TRUE;
 182     sel = GlobalHandleToSel16( handle );
 183     if (!VALID_HANDLE(sel)) return FALSE;
 184     pArena = GET_ARENA_PTR(sel);
 185     if (!pArena->size)
 186     {
 187         WARN( "already free %x\n", handle );
 188         return FALSE;
 189     }
 190     SELECTOR_FreeBlock( sel );
 191     memset( pArena, 0, sizeof(GLOBALARENA) );
 192     return TRUE;
 193 }
 194
 195 /***********************************************************************
 196  *           GLOBAL_MoveBlock
 197  */
 198 BOOL16 GLOBAL_MoveBlock( HGLOBAL16 handle, void *ptr, DWORD size )
 199 {
 200     WORD sel;
 201     GLOBALARENA *pArena;
 202
 203     if (!handle) return TRUE;
 204     sel = GlobalHandleToSel16( handle );
 205     if (!VALID_HANDLE(sel)) return FALSE;
 206     pArena = GET_ARENA_PTR(sel);
 207     if (pArena->selCount != 1)
 208         return FALSE;
 209
 210     pArena->base = ptr;
 211     pArena->size = size;
 212     SELECTOR_ReallocBlock( sel, ptr, size );
 213     return TRUE;
 214 }
 215
 216 /***********************************************************************
 217  *           GLOBAL_Alloc
 218  *
 219  * Implementation of GlobalAlloc16()
 220  */
 221 HGLOBAL16 GLOBAL_Alloc( UINT16 flags, DWORD size, HGLOBAL16 hOwner, unsigned char selflags )
 222 {
 223     void *ptr;
 224     HGLOBAL16 handle;
 225
 226     TRACE("%d flags=%04x\n", size, flags );
 227
 228     /* If size is 0, create a discarded block */
 229
 230     if (size == 0) return GLOBAL_CreateBlock( flags, NULL, 1, hOwner, selflags );
 231
 232     /* Fixup the size */
 233
 234     if (size >= GLOBAL_MAX_ALLOC_SIZE - 0x1f) return 0;
 235     size = (size + 0x1f) & ~0x1f;
 236
 237     /* Allocate the linear memory */
 238     ptr = HeapAlloc( get_win16_heap(), 0, size );
 239       /* FIXME: free discardable blocks and try again? */
 240     if (!ptr) return 0;
 241
 242       /* Allocate the selector(s) */
 243
 244     handle = GLOBAL_CreateBlock( flags, ptr, size, hOwner, selflags );
 245     if (!handle)
 246     {
 247         HeapFree( get_win16_heap(), 0, ptr );
 248         return 0;
 249     }
 250
 251     if (flags & GMEM_ZEROINIT) memset( ptr, 0, size );
 252     return handle;
 253 }
 254
 255 /***********************************************************************
 256  *           GlobalAlloc     (KERNEL.15)
 257  *           GlobalAlloc16   (KERNEL32.24)
 258  *
 259  * Allocate a global memory object.
 260  *
 261  * RETURNS
 262  *      Handle: Success
 263  *      NULL: Failure
 264  */
 265 HGLOBAL16 WINAPI GlobalAlloc16(
 266                  UINT16 flags, /* [in] Object allocation attributes */
 267                  DWORD size    /* [in] Number of bytes to allocate */
 268 ) {
 269     HANDLE16 owner = GetCurrentPDB16();
 270
 271     if (flags & GMEM_DDESHARE)
 272     {
 273         /* make it owned by the calling module */
 274         STACK16FRAME *frame = CURRENT_STACK16;
 275         owner = GetExePtr( frame->cs );
 276     }
 277     return GLOBAL_Alloc( flags, size, owner, WINE_LDT_FLAGS_DATA );
 278 }
 279
 280
 281 /***********************************************************************
 282  *           GlobalReAlloc     (KERNEL.16)
 283  *
 284  * Change the size or attributes of a global memory object.
 285  *
 286  * RETURNS
 287  *      Handle: Success
 288  *      NULL: Failure
 289  */
 290 HGLOBAL16 WINAPI GlobalReAlloc16(
 291                  HGLOBAL16 handle, /* [in] Handle of global memory object */
 292                  DWORD size,       /* [in] New size of block */
 293                  UINT16 flags      /* [in] How to reallocate object */
 294 ) {
 295     WORD selcount;
 296     DWORD oldsize;
 297     void *ptr, *newptr;
 298     GLOBALARENA *pArena, *pNewArena;
 299     WORD sel = GlobalHandleToSel16( handle );
 300     HANDLE heap = get_win16_heap();
 301
 302     TRACE("%04x %d flags=%04x\n",
 303                     handle, size, flags );
 304     if (!handle) return 0;
 305
 306     if (!VALID_HANDLE(handle))
 307     {
 308         WARN("Invalid handle 0x%04x!\n", handle);
 309         return 0;
 310     }
 311     pArena = GET_ARENA_PTR( handle );
 312
 313       /* Discard the block if requested */
 314
 315     if ((size == 0) && (flags & GMEM_MOVEABLE) && !(flags & GMEM_MODIFY))
 316     {
 317         if (!(pArena->flags & GA_MOVEABLE) ||
 318             !(pArena->flags & GA_DISCARDABLE) ||
 319             (pArena->lockCount > 0) || (pArena->pageLockCount > 0)) return 0;
 320         if (pArena->flags & GA_DOSMEM)
 321             DOSMEM_FreeBlock( pArena->base );
 322         else
 323             HeapFree( heap, 0, pArena->base );
 324         pArena->base = 0;
 325
 326         /* Note: we rely on the fact that SELECTOR_ReallocBlock won't
 327          * change the selector if we are shrinking the block.
 328          * FIXME: shouldn't we keep selectors until the block is deleted?
 329          */
 330         SELECTOR_ReallocBlock( sel, 0, 1 );
 331         return handle;
 332     }
 333
 334       /* Fixup the size */
 335
 336     if (size > GLOBAL_MAX_ALLOC_SIZE - 0x20) return 0;
 337     if (size == 0) size = 0x20;
 338     else size = (size + 0x1f) & ~0x1f;
 339
 340       /* Change the flags */
 341
 342     if (flags & GMEM_MODIFY)
 343     {
 344           /* Change the flags, leaving GA_DGROUP alone */
 345         pArena->flags = (pArena->flags & GA_DGROUP) | (flags & GA_MOVEABLE);
 346         if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 347         return handle;
 348     }
 349
 350       /* Reallocate the linear memory */
 351
 352     ptr = pArena->base;
 353     oldsize = pArena->size;
 354     TRACE("oldbase %p oldsize %08x newsize %08x\n", ptr,oldsize,size);
 355     if (ptr && (size == oldsize)) return handle;  /* Nothing to do */
 356
 357     if (pArena->flags & GA_DOSMEM)
 358     {
 359         if (DOSMEM_ResizeBlock(ptr, size, TRUE) == size)
 360             newptr = ptr;
 361         else if(pArena->pageLockCount > 0)
 362             newptr = 0;
 363         else
 364         {
 365             newptr = DOSMEM_AllocBlock( size, NULL );
 366             if (newptr)
 367             {
 368                 memcpy( newptr, ptr, oldsize );
 369                 DOSMEM_FreeBlock( ptr );
 370             }
 371         }
 372     }
 373     else
 374     {
 375         /*
 376          * if more than one reader (e.g. some pointer has been
 377          * given out by GetVDMPointer32W16),
 378          * only try to realloc in place
 379          */
 380
 381         if (ptr)
 382             newptr = HeapReAlloc( heap,
 383                 (pArena->pageLockCount > 0) ? HEAP_REALLOC_IN_PLACE_ONLY : 0,
 384                               ptr, size );
 385         else
 386             newptr = HeapAlloc( heap, 0, size );
 387
 388     }
 389
 390     if (!newptr)
 391     {
 392         FIXME("Realloc failed lock %d\n",pArena->pageLockCount);
 393         if (pArena->pageLockCount <1)
 394         {
 395             if (pArena->flags & GA_DOSMEM)
 396                 DOSMEM_FreeBlock( pArena->base );
 397             else
 398                 HeapFree( heap, 0, ptr );
 399             SELECTOR_FreeBlock( sel );
 400             memset( pArena, 0, sizeof(GLOBALARENA) );
 401         }
 402         return 0;
 403     }
 404     ptr = newptr;
 405
 406       /* Reallocate the selector(s) */
 407
 408     sel = SELECTOR_ReallocBlock( sel, ptr, size );
 409     if (!sel)
 410     {
 411         if (pArena->flags & GA_DOSMEM)
 412             DOSMEM_FreeBlock( pArena->base );
 413         else
 414             HeapFree( heap, 0, ptr );
 415         memset( pArena, 0, sizeof(GLOBALARENA) );
 416         return 0;
 417     }
 418     selcount = (size + 0xffff) / 0x10000;
 419
 420     if (!(pNewArena = GLOBAL_GetArena( sel, selcount )))
 421     {
 422         if (pArena->flags & GA_DOSMEM)
 423             DOSMEM_FreeBlock( pArena->base );
 424         else
 425             HeapFree( heap, 0, ptr );
 426         SELECTOR_FreeBlock( sel );
 427         return 0;
 428     }
 429
 430       /* Fill the new arena block
 431          As we may have used HEAP_REALLOC_IN_PLACE_ONLY, areas may overlap*/
 432
 433     if (pNewArena != pArena) memmove( pNewArena, pArena, sizeof(GLOBALARENA) );
 434     pNewArena->base = ptr;
 435     pNewArena->size = GetSelectorLimit16(sel) + 1;
 436     pNewArena->selCount = selcount;
 437     pNewArena->handle = (pNewArena->flags & GA_MOVEABLE) ? sel - 1 : sel;
 438
 439     if (selcount > 1)  /* clear the next arena blocks */
 440         memset( pNewArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 441
 442     if ((oldsize < size) && (flags & GMEM_ZEROINIT))
 443         memset( (char *)ptr + oldsize, 0, size - oldsize );
 444     return pNewArena->handle;
 445 }
 446
 447
 448 /***********************************************************************
 449  *           GlobalFree     (KERNEL.17)
 450  *           GlobalFree16   (KERNEL32.31)
 451  * RETURNS
 452  *      NULL: Success
 453  *      Handle: Failure
 454  */
 455 HGLOBAL16 WINAPI GlobalFree16(
 456                  HGLOBAL16 handle /* [in] Handle of global memory object */
 457 ) {
 458     void *ptr;
 459
 460     if (!VALID_HANDLE(handle))
 461     {
 462         WARN("Invalid handle 0x%04x passed to GlobalFree16!\n",handle);
 463         return 0;
 464     }
 465     ptr = GET_ARENA_PTR(handle)->base;
 466
 467     TRACE("%04x\n", handle );
 468     if (!GLOBAL_FreeBlock( handle )) return handle;  /* failed */
 469     HeapFree( get_win16_heap(), 0, ptr );
 470     return 0;
 471 }
 472
 473
 474 /**********************************************************************
 475  *           K32WOWGlobalLock16         (KERNEL32.60)
 476  */
 477 SEGPTR WINAPI K32WOWGlobalLock16( HGLOBAL16 handle )
 478 {
 479     WORD sel = GlobalHandleToSel16( handle );
 480     TRACE("(%04x) -> %08x\n", handle, MAKELONG( 0, sel ) );
 481
 482     if (handle)
 483     {
 484         if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 485
 486         if (!VALID_HANDLE(handle)) {
 487             WARN("Invalid handle 0x%04x passed to WIN16_GlobalLock16!\n",handle);
 488             sel = 0;
 489         }
 490         else if (!GET_ARENA_PTR(handle)->base)
 491             sel = 0;
 492         else
 493             GET_ARENA_PTR(handle)->lockCount++;
 494     }
 495
 496     return MAKESEGPTR( sel, 0 );
 497
 498 }
 499
 500
 501 /***********************************************************************
 502  *           GlobalLock   (KERNEL.18)
 503  *
 504  * This is the GlobalLock16() function used by 16-bit code.
 505  */
 506 SEGPTR WINAPI WIN16_GlobalLock16( HGLOBAL16 handle )
 507 {
 508     SEGPTR ret = K32WOWGlobalLock16( handle );
 509     CURRENT_STACK16->ecx = SELECTOROF(ret);  /* selector must be returned in CX as well */
 510     return ret;
 511 }
 512
 513
 514 /***********************************************************************
 515  *           GlobalLock16   (KERNEL32.25)
 516  *
 517  * This is the GlobalLock16() function used by 32-bit code.
 518  *
 519  * RETURNS
 520  *      Pointer to first byte of memory block
 521  *      NULL: Failure
 522  */
 523 LPVOID WINAPI GlobalLock16(
 524               HGLOBAL16 handle /* [in] Handle of global memory object */
 525 ) {
 526     if (!handle) return 0;
 527     if (!VALID_HANDLE(handle))
 528         return 0;
 529     GET_ARENA_PTR(handle)->lockCount++;
 530     return GET_ARENA_PTR(handle)->base;
 531 }
 532
 533
 534 /***********************************************************************
 535  *           GlobalUnlock     (KERNEL.19)
 536  *           GlobalUnlock16   (KERNEL32.26)
 537  * NOTES
 538  *      Should the return values be cast to booleans?
 539  *
 540  * RETURNS
 541  *      TRUE: Object is still locked
 542  *      FALSE: Object is unlocked
 543  */
 544 BOOL16 WINAPI GlobalUnlock16(
 545               HGLOBAL16 handle /* [in] Handle of global memory object */
 546 ) {
 547     GLOBALARENA *pArena = GET_ARENA_PTR(handle);
 548     if (!VALID_HANDLE(handle)) {
 549         WARN("Invalid handle 0x%04x passed to GlobalUnlock16!\n",handle);
 550         return 0;
 551     }
 552     TRACE("%04x\n", handle );
 553     if (pArena->lockCount) pArena->lockCount--;
 554     return pArena->lockCount;
 555 }
 556
 557 /***********************************************************************
 558  *     GlobalChangeLockCount               (KERNEL.365)
 559  *
 560  * This is declared as a register function as it has to preserve
 561  * *all* registers, even AX/DX !
 562  *
 563  */
 564 void WINAPI GlobalChangeLockCount16( HGLOBAL16 handle, INT16 delta, CONTEXT *context )
 565 {
 566     if ( delta == 1 )
 567         GlobalLock16( handle );
 568     else if ( delta == -1 )
 569         GlobalUnlock16( handle );
 570     else
 571         ERR("(%04X, %d): strange delta value\n", handle, delta );
 572 }
 573
 574 /***********************************************************************
 575  *           GlobalSize     (KERNEL.20)
 576  *           GlobalSize16   (KERNEL32.32)
 577  *
 578  * Get the current size of a global memory object.
 579  *
 580  * RETURNS
 581  *      Size in bytes of object
 582  *      0: Failure
 583  */
 584 DWORD WINAPI GlobalSize16(
 585              HGLOBAL16 handle /* [in] Handle of global memory object */
 586 ) {
 587     TRACE("%04x\n", handle );
 588     if (!handle) return 0;
 589     if (!VALID_HANDLE(handle))
 590         return 0;
 591     return GET_ARENA_PTR(handle)->size;
 592 }
 593
 594
 595 /***********************************************************************
 596  *           GlobalHandle   (KERNEL.21)
 597  *
 598  * Get the handle associated with a pointer to the global memory block.
 599  *
 600  * NOTES
 601  *      Why is GlobalHandleToSel used here with the sel as input?
 602  *
 603  * RETURNS
 604  *      Handle: Success
 605  *      NULL: Failure
 606  */
 607 DWORD WINAPI GlobalHandle16(
 608              WORD sel /* [in] Address of global memory block */
 609 ) {
 610     TRACE("%04x\n", sel );
 611     if (!VALID_HANDLE(sel)) {
 612         WARN("Invalid handle 0x%04x passed to GlobalHandle16!\n",sel);
 613         return 0;
 614     }
 615     return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 616 }
 617
 618 /***********************************************************************
 619  *           GlobalHandleNoRIP   (KERNEL.159)
 620  */
 621 DWORD WINAPI GlobalHandleNoRIP16( WORD sel )
 622 {
 623     int i;
 624     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 625         if (pGlobalArena[i].size!=0 && pGlobalArena[i].handle == sel)
 626                 return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 627     }
 628     return 0;
 629 }
 630
 631
 632 /***********************************************************************
 633  *           GlobalFlags     (KERNEL.22)
 634  *
 635  * Get information about a global memory object.
 636  *
 637  * NOTES
 638  *      Should this return GMEM_INVALID_HANDLE instead of 0 on invalid
 639  *      handle?
 640  *
 641  * RETURNS
 642  *      Value specifying flags and lock count
 643  *      GMEM_INVALID_HANDLE: Invalid handle
 644  */
 645 UINT16 WINAPI GlobalFlags16(
 646               HGLOBAL16 handle /* [in] Handle of global memory object */
 647 ) {
 648     GLOBALARENA *pArena;
 649
 650     TRACE("%04x\n", handle );
 651     if (!VALID_HANDLE(handle)) {
 652         WARN("Invalid handle 0x%04x passed to GlobalFlags16!\n",handle);
 653         return 0;
 654     }
 655     pArena = GET_ARENA_PTR(handle);
 656     return pArena->lockCount |
 657            ((pArena->flags & GA_DISCARDABLE) ? GMEM_DISCARDABLE : 0) |
 658            ((pArena->base == 0) ? GMEM_DISCARDED : 0);
 659 }
 660
 661
 662 /***********************************************************************
 663  *           LockSegment   (KERNEL.23)
 664  */
 665 HGLOBAL16 WINAPI LockSegment16( HGLOBAL16 handle )
 666 {
 667     TRACE("%04x\n", handle );
 668     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 669     if (!VALID_HANDLE(handle)) {
 670         WARN("Invalid handle 0x%04x passed to LockSegment16!\n",handle);
 671         return 0;
 672     }
 673     GET_ARENA_PTR(handle)->lockCount++;
 674     return handle;
 675 }
 676
 677
 678 /***********************************************************************
 679  *           UnlockSegment   (KERNEL.24)
 680  */
 681 void WINAPI UnlockSegment16( HGLOBAL16 handle )
 682 {
 683     TRACE("%04x\n", handle );
 684     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 685     if (!VALID_HANDLE(handle)) {
 686         WARN("Invalid handle 0x%04x passed to UnlockSegment16!\n",handle);
 687         return;
 688     }
 689     GET_ARENA_PTR(handle)->lockCount--;
 690     /* FIXME: this ought to return the lock count in CX (go figure...) */
 691 }
 692
 693
 694 /***********************************************************************
 695  *           GlobalCompact   (KERNEL.25)
 696  */
 697 DWORD WINAPI GlobalCompact16( DWORD desired )
 698 {
 699     return GLOBAL_MAX_ALLOC_SIZE;
 700 }
 701
 702
 703 /***********************************************************************
 704  *           GlobalFreeAll   (KERNEL.26)
 705  */
 706 void WINAPI GlobalFreeAll16( HGLOBAL16 owner )
 707 {
 708     int i;
 709     GLOBALARENA *pArena;
 710
 711     pArena = pGlobalArena;
 712     for (i = 0; i < globalArenaSize; i++, pArena++)
 713     {
 714         if ((pArena->size != 0) && (pArena->hOwner == owner))
 715             GlobalFree16( pArena->handle );
 716     }
 717 }
 718
 719
 720 /***********************************************************************
 721  *           GlobalWire     (KERNEL.111)
 722  *           GlobalWire16   (KERNEL32.29)
 723  */
 724 SEGPTR WINAPI GlobalWire16( HGLOBAL16 handle )
 725 {
 726     return WIN16_GlobalLock16( handle );
 727 }
 728
 729
 730 /***********************************************************************
 731  *           GlobalUnWire     (KERNEL.112)
 732  *           GlobalUnWire16   (KERNEL32.30)
 733  */
 734 BOOL16 WINAPI GlobalUnWire16( HGLOBAL16 handle )
 735 {
 736     return !GlobalUnlock16( handle );
 737 }
 738
 739
 740 /***********************************************************************
 741  *           SetSwapAreaSize   (KERNEL.106)
 742  */
 743 LONG WINAPI SetSwapAreaSize16( WORD size )
 744 {
 745     FIXME("(%d) - stub!\n", size );
 746     return MAKELONG( size, 0xffff );
 747 }
 748
 749
 750 /***********************************************************************
 751  *           GlobalLRUOldest   (KERNEL.163)
 752  */
 753 HGLOBAL16 WINAPI GlobalLRUOldest16( HGLOBAL16 handle )
 754 {
 755     TRACE("%04x\n", handle );
 756     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 757     return handle;
 758 }
 759
 760
 761 /***********************************************************************
 762  *           GlobalLRUNewest   (KERNEL.164)
 763  */
 764 HGLOBAL16 WINAPI GlobalLRUNewest16( HGLOBAL16 handle )
 765 {
 766     TRACE("%04x\n", handle );
 767     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 768     return handle;
 769 }
 770
 771
 772 /***********************************************************************
 773  *           GetFreeSpace   (KERNEL.169)
 774  */
 775 DWORD WINAPI GetFreeSpace16( UINT16 wFlags )
 776 {
 777     MEMORYSTATUS ms;
 778     GlobalMemoryStatus( &ms );
 779     return ms.dwAvailVirtual;
 780 }
 781
 782 /***********************************************************************
 783  *           GlobalDOSAlloc   (KERNEL.184)
 784  *
 785  * Allocate memory in the first MB.
 786  *
 787  * RETURNS
 788  *      Address (HW=Paragraph segment; LW=Selector)
 789  */
 790 DWORD WINAPI GlobalDOSAlloc16(
 791              DWORD size /* [in] Number of bytes to be allocated */
 792 ) {
 793    UINT16    uParagraph;
 794    LPVOID    lpBlock = DOSMEM_AllocBlock( size, &uParagraph );
 795
 796    if( lpBlock )
 797    {
 798        HMODULE16 hModule = GetModuleHandle16("KERNEL");
 799        WORD      wSelector;
 800        GLOBALARENA *pArena;
 801
 802        wSelector = GLOBAL_CreateBlock(GMEM_FIXED, lpBlock, size, hModule, WINE_LDT_FLAGS_DATA );
 803        pArena = GET_ARENA_PTR(wSelector);
 804        pArena->flags |= GA_DOSMEM;
 805        return MAKELONG(wSelector,uParagraph);
 806    }
 807    return 0;
 808 }
 809
 810
 811 /***********************************************************************
 812  *           GlobalDOSFree      (KERNEL.185)
 813  *
 814  * Free memory allocated with GlobalDOSAlloc
 815  *
 816  * RETURNS
 817  *      NULL: Success
 818  *      sel: Failure
 819  */
 820 WORD WINAPI GlobalDOSFree16(
 821             WORD sel /* [in] Selector */
 822 ) {
 823    DWORD   block = GetSelectorBase(sel);
 824
 825    if( block && block < 0x100000 )
 826    {
 827        LPVOID lpBlock = DOSMEM_MapDosToLinear( block );
 828        if( DOSMEM_FreeBlock( lpBlock ) )
 829            GLOBAL_FreeBlock( sel );
 830        sel = 0;
 831    }
 832    return sel;
 833 }
 834
 835
 836 /***********************************************************************
 837  *           GlobalPageLock   (KERNEL.191)
 838  *           GlobalSmartPageLock(KERNEL.230)
 839  */
 840 WORD WINAPI GlobalPageLock16( HGLOBAL16 handle )
 841 {
 842     TRACE("%04x\n", handle );
 843     if (!VALID_HANDLE(handle)) {
 844         WARN("Invalid handle 0x%04x passed to GlobalPageLock!\n",handle);
 845         return 0;
 846     }
 847     return ++(GET_ARENA_PTR(handle)->pageLockCount);
 848 }
 849
 850
 851 /***********************************************************************
 852  *           GlobalPageUnlock   (KERNEL.192)
 853  *           GlobalSmartPageUnlock(KERNEL.231)
 854  */
 855 WORD WINAPI GlobalPageUnlock16( HGLOBAL16 handle )
 856 {
 857     TRACE("%04x\n", handle );
 858     if (!VALID_HANDLE(handle)) {
 859         WARN("Invalid handle 0x%04x passed to GlobalPageUnlock!\n",handle);
 860         return 0;
 861     }
 862     return --(GET_ARENA_PTR(handle)->pageLockCount);
 863 }
 864
 865
 866 /***********************************************************************
 867  *           GlobalFix     (KERNEL.197)
 868  *           GlobalFix16   (KERNEL32.27)
 869  */
 870 WORD WINAPI GlobalFix16( HGLOBAL16 handle )
 871 {
 872     TRACE("%04x\n", handle );
 873     if (!VALID_HANDLE(handle)) {
 874         WARN("Invalid handle 0x%04x passed to GlobalFix16!\n",handle);
 875         return 0;
 876     }
 877     GET_ARENA_PTR(handle)->lockCount++;
 878
 879     return GlobalHandleToSel16(handle);
 880 }
 881
 882
 883 /***********************************************************************
 884  *           GlobalUnfix     (KERNEL.198)
 885  *           GlobalUnfix16   (KERNEL32.28)
 886  */
 887 void WINAPI GlobalUnfix16( HGLOBAL16 handle )
 888 {
 889     TRACE("%04x\n", handle );
 890     if (!VALID_HANDLE(handle)) {
 891         WARN("Invalid handle 0x%04x passed to GlobalUnfix16!\n",handle);
 892         return;
 893     }
 894     GET_ARENA_PTR(handle)->lockCount--;
 895 }
 896
 897
 898 /***********************************************************************
 899  *           FarSetOwner   (KERNEL.403)
 900  */
 901 void WINAPI FarSetOwner16( HGLOBAL16 handle, HANDLE16 hOwner )
 902 {
 903     if (!VALID_HANDLE(handle)) {
 904         WARN("Invalid handle 0x%04x passed to FarSetOwner!\n",handle);
 905         return;
 906     }
 907     GET_ARENA_PTR(handle)->hOwner = hOwner;
 908 }
 909
 910
 911 /***********************************************************************
 912  *           FarGetOwner   (KERNEL.404)
 913  */
 914 HANDLE16 WINAPI FarGetOwner16( HGLOBAL16 handle )
 915 {
 916     if (!VALID_HANDLE(handle)) {
 917         WARN("Invalid handle 0x%04x passed to FarGetOwner!\n",handle);
 918         return 0;
 919     }
 920     return GET_ARENA_PTR(handle)->hOwner;
 921 }
 922
 923
 924 /************************************************************************
 925  *              GlobalMasterHandle (KERNEL.28)
 926  *
 927  *
 928  * Should return selector and handle of the information structure for
 929  * the global heap. selector and handle are stored in the THHOOK as
 930  * pGlobalHeap and hGlobalHeap.
 931  * As Wine doesn't have this structure, we return both values as zero
 932  * Applications should interpret this as "No Global Heap"
 933  */
 934 DWORD WINAPI GlobalMasterHandle16(void)
 935 {
 936     FIXME(": stub\n");
 937     return 0;
 938 }
 939
 940 /***********************************************************************
 941  *           GlobalHandleToSel   (TOOLHELP.50)
 942  *
 943  * FIXME: This is in TOOLHELP but we keep a copy here for now.
 944  */
 945 WORD WINAPI GlobalHandleToSel16( HGLOBAL16 handle )
 946 {
 947     if (!handle) return 0;
 948     if (!VALID_HANDLE(handle)) {
 949         WARN("Invalid handle 0x%04x passed to GlobalHandleToSel!\n",handle);
 950         return 0;
 951     }
 952     if (!(handle & 7))
 953     {
 954         WARN("Program attempted invalid selector conversion\n" );
 955         return handle - 1;
 956     }
 957     return handle | 7;
 958 }
 959
 960
 961 /***********************************************************************
 962  *           GetFreeMemInfo   (KERNEL.316)
 963  */
 964 DWORD WINAPI GetFreeMemInfo16(void)
 965 {
 966     SYSTEM_BASIC_INFORMATION info;
 967     MEMORYSTATUS status;
 968
 969     NtQuerySystemInformation( SystemBasicInformation, &info, sizeof(info), NULL );
 970     GlobalMemoryStatus( &status );
 971     return MAKELONG( status.dwTotalVirtual / info.PageSize, status.dwAvailVirtual / info.PageSize );
 972 }
 973
 974 /***********************************************************************
 975  *           A20Proc   (KERNEL.165)
 976  */
 977 void WINAPI A20Proc16( WORD unused )
 978 {
 979     /* this is also a NOP in Windows */
 980 }
 981
 982 /***********************************************************************
 983  *           LimitEMSPages   (KERNEL.156)
 984  */
 985 DWORD WINAPI LimitEMSPages16( DWORD unused )
 986 {
 987     return 0;
 988 }