void* anv_gem_mmap(struct anv_device *device,
uint32_t gem_handle, uint64_t offset, uint64_t size, uint32_t flags);
void anv_gem_munmap(void *p, uint64_t size);
void* anv_gem_mmap(struct anv_device *device,
uint32_t gem_handle, uint64_t offset, uint64_t size, uint32_t flags);
void anv_gem_munmap(void *p, uint64_t size);