| 1 | #ifndef QEMU_MMAP_ALLOC_H |
| 2 | #define QEMU_MMAP_ALLOC_H |
| 3 | |
| 4 | typedef enum { |
| 5 | QEMU_FS_TYPE_UNKNOWN = 0, |
| 6 | QEMU_FS_TYPE_TMPFS, |
| 7 | QEMU_FS_TYPE_HUGETLBFS, |
| 8 | QEMU_FS_TYPE_NUM, |
| 9 | } QemuFsType; |
| 10 | |
| 11 | size_t qemu_fd_getpagesize(int fd); |
| 12 | QemuFsType qemu_fd_getfs(int fd); |
| 13 | |
| 14 | /** |
| 15 | * qemu_ram_mmap: mmap anonymous memory, the specified file or device. |
| 16 | * |
| 17 | * mmap() abstraction to map guest RAM, simplifying flag handling, taking |
| 18 | * care of alignment requirements and installing guard pages. |
| 19 | * |
| 20 | * Parameters: |
| 21 | * @fd: the file or the device to mmap |
| 22 | * @size: the number of bytes to be mmaped |
| 23 | * @align: if not zero, specify the alignment of the starting mapping address; |
| 24 | * otherwise, the alignment in use will be determined by QEMU. |
| 25 | * @qemu_map_flags: QEMU_MAP_* flags |
| 26 | * @map_offset: map starts at offset of map_offset from the start of fd |
| 27 | * |
| 28 | * Internally, MAP_PRIVATE, MAP_ANONYMOUS and MAP_SHARED_VALIDATE are set |
| 29 | * implicitly based on other parameters. |
| 30 | * |
| 31 | * Return: |
| 32 | * On success, return a pointer to the mapped area. |
| 33 | * On failure, return MAP_FAILED. |
| 34 | */ |
| 35 | void *qemu_ram_mmap(int fd, |
| 36 | size_t size, |
| 37 | size_t align, |
| 38 | uint32_t qemu_map_flags, |
| 39 | off_t map_offset); |
| 40 | |
| 41 | void qemu_ram_munmap(int fd, void *ptr, size_t size); |
| 42 | |
| 43 | /* |
| 44 | * Abstraction of PROT_ and MAP_ flags as passed to mmap(), for example, |
| 45 | * consumed by qemu_ram_mmap(). |
| 46 | */ |
| 47 | |
| 48 | /* Map PROT_READ instead of PROT_READ | PROT_WRITE. */ |
| 49 | #define QEMU_MAP_READONLY (1 << 0) |
| 50 | |
| 51 | /* Use MAP_SHARED instead of MAP_PRIVATE. */ |
| 52 | #define QEMU_MAP_SHARED (1 << 1) |
| 53 | |
| 54 | /* |
| 55 | * Use MAP_SYNC | MAP_SHARED_VALIDATE if supported. Ignored without |
| 56 | * QEMU_MAP_SHARED. If mapping fails, warn and fallback to !QEMU_MAP_SYNC. |
| 57 | */ |
| 58 | #define QEMU_MAP_SYNC (1 << 2) |
| 59 | |
| 60 | /* |
| 61 | * Use MAP_NORESERVE to skip reservation of swap space (or huge pages if |
| 62 | * applicable). Bail out if not supported/effective. |
| 63 | */ |
| 64 | #define QEMU_MAP_NORESERVE (1 << 3) |
| 65 | |
| 66 | #endif |