MemoryRegionSection memory_region_find(MemoryRegion *mr, hwaddr addr, uint64_t size) { MemoryRegionSection ret = { .mr = NULL }; MemoryRegion *root; AddressSpace *as; AddrRange range; FlatView *view; FlatRange *fr; addr += mr->addr; for (root = mr; root->container; ) { root = root->container; addr += root->addr; } as = memory_region_to_address_space(root); if (!as) { return ret; } range = addrrange_make(int128_make64(addr), int128_make64(size)); rcu_read_lock(); view = atomic_rcu_read(&as->current_map); fr = flatview_lookup(view, range); if (!fr) { goto out; } while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) { --fr; } ret.mr = fr->mr; ret.address_space = as; range = addrrange_intersection(range, fr->addr); ret.offset_within_region = fr->offset_in_region; ret.offset_within_region += int128_get64(int128_sub(range.start, fr->addr.start)); ret.size = range.size; ret.offset_within_address_space = int128_get64(range.start); ret.readonly = fr->readonly; memory_region_ref(ret.mr); out: rcu_read_unlock(); return ret; }
MemoryRegionSection memory_region_find(MemoryRegion *mr, hwaddr addr, uint64_t size) { MemoryRegionSection ret = { .mr = NULL }; MemoryRegion *root; AddressSpace *as; AddrRange range; FlatView *view; FlatRange *fr; addr += mr->addr; for (root = mr; root->container; ) { root = root->container; addr += root->addr; } as = memory_region_to_address_space(root); if (!as) { return ret; } range = addrrange_make(int128_make64(addr), int128_make64(size)); rcu_read_lock(); view = atomic_rcu_read(&as->current_map); fr = flatview_lookup(view, range); if (!fr) { goto out; } while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) { --fr; } ret.mr = fr->mr; ret.address_space = as; range = addrrange_intersection(range, fr->addr); ret.offset_within_region = fr->offset_in_region; ret.offset_within_region += int128_get64(int128_sub(range.start, fr->addr.start)); ret.size = range.size; ret.offset_within_address_space = int128_get64(range.start); ret.readonly = fr->readonly; memory_region_ref(ret.mr); out: rcu_read_unlock(); return ret; }