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