2 * QEMU Hyper-V Dynamic Memory Protocol driver
4 * Copyright (C) 2020-2023 Oracle and/or its affiliates.
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
10 #ifndef HW_HYPERV_HV_BALLOON_INTERNAL_H
11 #define HW_HYPERV_HV_BALLOON_INTERNAL_H
14 #define HV_BALLOON_PFN_SHIFT 12
15 #define HV_BALLOON_PAGE_SIZE (1 << HV_BALLOON_PFN_SHIFT)
17 #define SUM_OVERFLOW_U64(in1, in2) ((in1) > UINT64_MAX - (in2))
18 #define SUM_SATURATE_U64(in1, in2) \
20 uint64_t _in1 = (in1), _in2 = (in2); \
23 if (!SUM_OVERFLOW_U64(_in1, _in2)) { \
24 _result = _in1 + _in2; \
26 _result = UINT64_MAX; \