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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <balloc.h>
  30. #include <types.h>
  31. #include <align.h>
  32.  
  33. static ballocs_t *ballocs;
  34.  
  35. void balloc_init(ballocs_t *b, uintptr_t base)
  36. {
  37.     ballocs = b;
  38.     ballocs->base = base;
  39.     ballocs->size = 0;
  40. }
  41.  
  42. void *balloc(size_t size, size_t alignment)
  43. {
  44.     uintptr_t addr;
  45.  
  46.     /* Enforce minimal alignment. */
  47.     alignment = ALIGN_UP(alignment, 4);
  48.    
  49.     addr = ballocs->base + ALIGN_UP(ballocs->size, alignment);
  50.  
  51.     if (ALIGN_UP(ballocs->size, alignment) + size > BALLOC_MAX_SIZE)
  52.         return NULL;
  53.        
  54.     ballocs->size = ALIGN_UP(ballocs->size, alignment) + size;
  55.    
  56.     return (void *) addr;
  57. }
  58.