getMemoryMapInfo

    pub fn getMemoryMapInfo(self: *const BootServices) uefi.UnexpectedError!MemoryMapInfo {
        var info: MemoryMapInfo = undefined;
        info.len = 0;

        switch (self._getMemoryMap(
            &info.len,
            null,
            &info.key,
            &info.descriptor_size,
            &info.descriptor_version,
        )) {
            .success, .buffer_too_small => {
                info.len = @divExact(info.len, info.descriptor_size);
                return info;
            },
            else => |status| return uefi.unexpectedStatus(status),
        }
    }