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  1. /*
  2.  * Copyright © 2008 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21.  * IN THE SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *     Jesse Barnes <jbarnes@virtuousgeek.org>
  25.  *
  26.  */
  27. #ifndef _DRM_MEM_UTIL_H_
  28. #define _DRM_MEM_UTIL_H_
  29.  
  30. #include <linux/vmalloc.h>
  31.  
  32. static __inline__ void *drm_calloc_large(size_t nmemb, size_t size)
  33. {
  34.     void *p;
  35.  
  36.         if (size != 0 && nmemb > SIZE_MAX / size)
  37.                 return NULL;
  38.  
  39.         if (size * nmemb <= PAGE_SIZE)
  40.             return kcalloc(nmemb, size, GFP_KERNEL);
  41.  
  42.     p = (void*)KernelAlloc(size * nmemb);
  43.     if ( p != NULL )
  44.         memset(p, 0,size * nmemb);
  45.  
  46.     return p;
  47. }
  48.  
  49. /* Modeled after cairo's malloc_ab, it's like calloc but without the zeroing. */
  50. static __inline__ void *drm_malloc_ab(size_t nmemb, size_t size)
  51. {
  52.         if (size != 0 && nmemb > SIZE_MAX / size)
  53.                 return NULL;
  54.  
  55.         if (size * nmemb <= PAGE_SIZE)
  56.         return kmalloc(nmemb * size, GFP_KERNEL);
  57.  
  58.     return (void*)KernelAlloc(size * nmemb);
  59. }
  60.  
  61. static __inline void drm_free_large(void *ptr)
  62. {
  63.     if( ((addr_t)ptr & 0xFFF) == 0 )      // !!!
  64.         KernelFree(ptr);
  65.     else
  66.         kfree(ptr);
  67. }
  68.  
  69. #endif
  70.