Commit 4c2766b6 authored by Emil Velikov's avatar Emil Velikov
Browse files

Add private mmap/munmap wrappers



Unlike Linux, Android (bionic) has separate functions - mmap & mmap64.
Add a local wrapper (inspired by gallium) that will be used throughout
libdrm to combat this bionic feature.

v2:
 - Drop the undefined unlikely macro.
 - Use macro for munmap under Android.
 - Wrap long lines.
Signed-off-by: Emil Velikov's avatarEmil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com> (v1)
parent 268dce41
......@@ -31,4 +31,59 @@
# define drm_public
#endif
/**
* Static (compile-time) assertion.
* Basically, use COND to dimension an array. If COND is false/zero the
* array size will be -1 and we'll get a compilation error.
*/
#define STATIC_ASSERT(COND) \
do { \
(void) sizeof(char [1 - 2*!(COND)]); \
} while (0)
#include <sys/mman.h>
#if defined(ANDROID)
#include <errno.h> /* for EINVAL */
extern void *__mmap2(void *, size_t, int, int, int, size_t);
static inline void *drm_mmap(void *addr, size_t length, int prot, int flags,
int fd, loff_t offset)
{
/* offset must be aligned to 4096 (not necessarily the page size) */
if (offset & 4095) {
errno = EINVAL;
return MAP_FAILED;
}
return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
}
# define drm_munmap(addr, length) \
munmap(addr, length)
#else
/* assume large file support exists */
# define drm_mmap(addr, length, prot, flags, fd, offset) \
mmap(addr, length, prot, flags, fd, offset)
static inline int drm_munmap(void *addr, size_t length)
{
/* Copied from configure code generated by AC_SYS_LARGEFILE */
#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
(((off_t) 1 << 31) << 31))
STATIC_ASSERT(LARGE_OFF_T % 2147483629 == 721 &&
LARGE_OFF_T % 2147483647 == 1);
#undef LARGE_OFF_T
return munmap(addr, length);
}
#endif
#endif
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