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