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      1 /**************************************************************************
      2  *
      3  * Copyright 2011 LunarG, Inc.
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
     22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     27 
     28 /**
     29  * @file
     30  * OS independent memory mapping (with large file support).
     31  *
     32  * @author Chia-I Wu <olvaffe (at) gmail.com>
     33  */
     34 
     35 #ifndef _OS_MMAN_H_
     36 #define _OS_MMAN_H_
     37 
     38 
     39 #include "pipe/p_config.h"
     40 #include "pipe/p_compiler.h"
     41 
     42 #if defined(PIPE_OS_UNIX)
     43 #  include <sys/mman.h>
     44 #else
     45 #  error Unsupported OS
     46 #endif
     47 
     48 #if defined(PIPE_OS_ANDROID)
     49 #  include <errno.h> /* for EINVAL */
     50 #endif
     51 
     52 #ifdef  __cplusplus
     53 extern "C" {
     54 #endif
     55 
     56 
     57 #if defined(PIPE_OS_ANDROID) && !defined(__LP64__)
     58 
     59 extern void *__mmap2(void *, size_t, int, int, int, size_t);
     60 
     61 static inline void *os_mmap(void *addr, size_t length, int prot, int flags,
     62                             int fd, loff_t offset)
     63 {
     64    /* offset must be aligned to 4096 (not necessarily the page size) */
     65    if (unlikely(offset & 4095)) {
     66       errno = EINVAL;
     67       return MAP_FAILED;
     68    }
     69 
     70    return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
     71 }
     72 
     73 #  define os_munmap(addr, length) \
     74              munmap(addr, length)
     75 
     76 #else
     77 /* assume large file support exists */
     78 #  define os_mmap(addr, length, prot, flags, fd, offset) \
     79              mmap(addr, length, prot, flags, fd, offset)
     80 
     81 static inline int os_munmap(void *addr, size_t length)
     82 {
     83    /* Copied from configure code generated by AC_SYS_LARGEFILE */
     84 #define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
     85                      (((off_t) 1 << 31) << 31))
     86    STATIC_ASSERT(LARGE_OFF_T % 2147483629 == 721 &&
     87                  LARGE_OFF_T % 2147483647 == 1);
     88 #undef LARGE_OFF_T
     89 
     90    return munmap(addr, length);
     91 }
     92 #endif
     93 
     94 
     95 #ifdef	__cplusplus
     96 }
     97 #endif
     98 
     99 #endif /* _OS_MMAN_H_ */
    100