1 /*
2  * QEMU Hyper-V Dynamic Memory Protocol driver
3  *
4  * Copyright (C) 2020-2023 Oracle and/or its affiliates.
5  *
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.
8  */
9 
10 #ifndef HW_HYPERV_HV_BALLOON_INTERNAL_H
11 #define HW_HYPERV_HV_BALLOON_INTERNAL_H
12 
13 #include "qemu/osdep.h"
14 
15 #define HV_BALLOON_PFN_SHIFT 12
16 #define HV_BALLOON_PAGE_SIZE (1 << HV_BALLOON_PFN_SHIFT)
17 
18 #define SUM_OVERFLOW_U64(in1, in2) ((in1) > UINT64_MAX - (in2))
19 #define SUM_SATURATE_U64(in1, in2)              \
20     ({                                          \
21         uint64_t _in1 = (in1), _in2 = (in2);    \
22         uint64_t _result;                       \
23                                                 \
24         if (!SUM_OVERFLOW_U64(_in1, _in2)) {    \
25             _result = _in1 + _in2;              \
26         } else {                                \
27             _result = UINT64_MAX;               \
28         }                                       \
29                                                 \
30         _result;                                \
31     })
32 
33 #endif
34