33 lines
1.1 KiB
C
33 lines
1.1 KiB
C
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/*
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* QEMU Hyper-V Dynamic Memory Protocol driver
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*
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* Copyright (C) 2020-2023 Oracle and/or its affiliates.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef HW_HYPERV_HV_BALLOON_INTERNAL_H
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#define HW_HYPERV_HV_BALLOON_INTERNAL_H
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#define HV_BALLOON_PFN_SHIFT 12
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#define HV_BALLOON_PAGE_SIZE (1 << HV_BALLOON_PFN_SHIFT)
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#define SUM_OVERFLOW_U64(in1, in2) ((in1) > UINT64_MAX - (in2))
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#define SUM_SATURATE_U64(in1, in2) \
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({ \
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uint64_t _in1 = (in1), _in2 = (in2); \
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uint64_t _result; \
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\
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if (!SUM_OVERFLOW_U64(_in1, _in2)) { \
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_result = _in1 + _in2; \
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} else { \
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_result = UINT64_MAX; \
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} \
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\
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_result; \
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})
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#endif
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