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 14 #define HV_BALLOON_PFN_SHIFT 12 15 #define HV_BALLOON_PAGE_SIZE (1 << HV_BALLOON_PFN_SHIFT) 16 17 #define SUM_OVERFLOW_U64(in1, in2) ((in1) > UINT64_MAX - (in2)) 18 #define SUM_SATURATE_U64(in1, in2) \ 19 ({ \ 20 uint64_t _in1 = (in1), _in2 = (in2); \ 21 uint64_t _result; \ 22 \ 23 if (!SUM_OVERFLOW_U64(_in1, _in2)) { \ 24 _result = _in1 + _in2; \ 25 } else { \ 26 _result = UINT64_MAX; \ 27 } \ 28 \ 29 _result; \ 30 }) 31 32 #endif 33