void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared) { void *ptr; ptr = VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE); trace_qemu_anon_ram_alloc(size, ptr); if (ptr && align) { *align = MAX(get_allocation_granularity(), getpagesize()); } return ptr; }
int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset) { HANDLE fh = (HANDLE)_get_osfhandle(fd); DWORD alignment = get_allocation_granularity(); DWORD fmap_prot = 0; DWORD view_prot = 0; DWORD off_low = 0; DWORD off_hi = 0; git_off_t page_start; git_off_t page_offset; GIT_MMAP_VALIDATE(out, len, prot, flags); out->data = NULL; out->len = 0; out->fmh = NULL; if (fh == INVALID_HANDLE_VALUE) { errno = EBADF; giterr_set(GITERR_OS, "Failed to mmap. Invalid handle value"); return -1; } if (prot & GIT_PROT_WRITE) fmap_prot |= PAGE_READWRITE; else if (prot & GIT_PROT_READ) fmap_prot |= PAGE_READONLY; if (prot & GIT_PROT_WRITE) view_prot |= FILE_MAP_WRITE; if (prot & GIT_PROT_READ) view_prot |= FILE_MAP_READ; page_start = (offset / alignment) * alignment; page_offset = offset - page_start; if (page_offset != 0) { /* offset must be multiple of the allocation granularity */ errno = EINVAL; giterr_set(GITERR_OS, "Failed to mmap. Offset must be multiple of allocation granularity"); return -1; } out->fmh = CreateFileMapping(fh, NULL, fmap_prot, 0, 0, NULL); if (!out->fmh || out->fmh == INVALID_HANDLE_VALUE) { giterr_set(GITERR_OS, "Failed to mmap. Invalid handle value"); out->fmh = NULL; return -1; } assert(sizeof(git_off_t) == 8); off_low = (DWORD)(page_start); off_hi = (DWORD)(page_start >> 32); out->data = MapViewOfFile(out->fmh, view_prot, off_hi, off_low, len); if (!out->data) { giterr_set(GITERR_OS, "Failed to mmap. No data written"); CloseHandle(out->fmh); out->fmh = NULL; return -1; } out->len = len; return 0; }
int git__mmap_alignment(size_t *page_size) { *page_size = get_allocation_granularity(); return 0; }