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2a6a4076 MA |
1 | #ifndef QEMU_MMAP_ALLOC_H |
2 | #define QEMU_MMAP_ALLOC_H | |
794e8f30 | 3 | |
fa45f8da PX |
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; | |
794e8f30 | 10 | |
7197fb40 | 11 | size_t qemu_fd_getpagesize(int fd); |
fa45f8da | 12 | QemuFsType qemu_fd_getfs(int fd); |
7197fb40 | 13 | |
2ac0f162 | 14 | /** |
b444f5c0 DH |
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. | |
2ac0f162 ZY |
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. | |
b444f5c0 | 25 | * @qemu_map_flags: QEMU_MAP_* flags |
44a4ff31 | 26 | * @map_offset: map starts at offset of map_offset from the start of fd |
2ac0f162 | 27 | * |
b444f5c0 DH |
28 | * Internally, MAP_PRIVATE, MAP_ANONYMOUS and MAP_SHARED_VALIDATE are set |
29 | * implicitly based on other parameters. | |
30 | * | |
2ac0f162 ZY |
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, | |
b444f5c0 | 38 | uint32_t qemu_map_flags, |
44a4ff31 | 39 | off_t map_offset); |
794e8f30 | 40 | |
53adb9d4 | 41 | void qemu_ram_munmap(int fd, void *ptr, size_t size); |
794e8f30 | 42 | |
5b3e3431 PM |
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 | ||
794e8f30 | 66 | #endif |