90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/*
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* Copyright © 2014 NVIDIA Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef LIBDRM_LIBDRM_H
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#define LIBDRM_LIBDRM_H
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#if defined(HAVE_VISIBILITY)
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# define drm_private __attribute__((visibility("hidden")))
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# define drm_public __attribute__((visibility("default")))
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#else
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# define drm_private
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# define drm_public
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#endif
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/**
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* Static (compile-time) assertion.
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* Basically, use COND to dimension an array. If COND is false/zero the
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* array size will be -1 and we'll get a compilation error.
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*/
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#define STATIC_ASSERT(COND) \
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do { \
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(void) sizeof(char [1 - 2*!(COND)]); \
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} while (0)
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#include <sys/mman.h>
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#if defined(ANDROID)
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#include <errno.h> /* for EINVAL */
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extern void *__mmap2(void *, size_t, int, int, int, size_t);
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static inline void *drm_mmap(void *addr, size_t length, int prot, int flags,
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int fd, loff_t offset)
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{
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/* offset must be aligned to 4096 (not necessarily the page size) */
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if (offset & 4095) {
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errno = EINVAL;
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return MAP_FAILED;
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}
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return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
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}
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# define drm_munmap(addr, length) \
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munmap(addr, length)
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#else
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/* assume large file support exists */
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# define drm_mmap(addr, length, prot, flags, fd, offset) \
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mmap(addr, length, prot, flags, fd, offset)
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static inline int drm_munmap(void *addr, size_t length)
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{
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/* Copied from configure code generated by AC_SYS_LARGEFILE */
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#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
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(((off_t) 1 << 31) << 31))
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STATIC_ASSERT(LARGE_OFF_T % 2147483629 == 721 &&
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LARGE_OFF_T % 2147483647 == 1);
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#undef LARGE_OFF_T
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return munmap(addr, length);
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}
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#endif
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#endif
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