1 #ifndef QEMU_MMAP_ALLOC_H 2 #define QEMU_MMAP_ALLOC_H 3 4 5 size_t qemu_fd_getpagesize(int fd); 6 7 size_t qemu_mempath_getpagesize(const char *mem_path); 8 9 /** 10 * qemu_ram_mmap: mmap anonymous memory, the specified file or device. 11 * 12 * mmap() abstraction to map guest RAM, simplifying flag handling, taking 13 * care of alignment requirements and installing guard pages. 14 * 15 * Parameters: 16 * @fd: the file or the device to mmap 17 * @size: the number of bytes to be mmaped 18 * @align: if not zero, specify the alignment of the starting mapping address; 19 * otherwise, the alignment in use will be determined by QEMU. 20 * @qemu_map_flags: QEMU_MAP_* flags 21 * @map_offset: map starts at offset of map_offset from the start of fd 22 * 23 * Internally, MAP_PRIVATE, MAP_ANONYMOUS and MAP_SHARED_VALIDATE are set 24 * implicitly based on other parameters. 25 * 26 * Return: 27 * On success, return a pointer to the mapped area. 28 * On failure, return MAP_FAILED. 29 */ 30 void *qemu_ram_mmap(int fd, 31 size_t size, 32 size_t align, 33 uint32_t qemu_map_flags, 34 off_t map_offset); 35 36 void qemu_ram_munmap(int fd, void *ptr, size_t size); 37 38 /* 39 * Abstraction of PROT_ and MAP_ flags as passed to mmap(), for example, 40 * consumed by qemu_ram_mmap(). 41 */ 42 43 /* Map PROT_READ instead of PROT_READ | PROT_WRITE. */ 44 #define QEMU_MAP_READONLY (1 << 0) 45 46 /* Use MAP_SHARED instead of MAP_PRIVATE. */ 47 #define QEMU_MAP_SHARED (1 << 1) 48 49 /* 50 * Use MAP_SYNC | MAP_SHARED_VALIDATE if supported. Ignored without 51 * QEMU_MAP_SHARED. If mapping fails, warn and fallback to !QEMU_MAP_SYNC. 52 */ 53 #define QEMU_MAP_SYNC (1 << 2) 54 55 /* 56 * Use MAP_NORESERVE to skip reservation of swap space (or huge pages if 57 * applicable). Bail out if not supported/effective. 58 */ 59 #define QEMU_MAP_NORESERVE (1 << 3) 60 61 #endif 62