101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
/*
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* Copyright (c) 2019 Nutanix Inc. All rights reserved.
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*
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* Authors: Thanos Makatos <thanos@nutanix.com>
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* Swapnil Ingle <swapnil.ingle@nutanix.com>
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* Felipe Franciosi <felipe@nutanix.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Nutanix nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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*/
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/*
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* Private utilities used by the library and sample/test code.
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*/
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#ifndef LIB_VFIO_USER_COMMON_H
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#define LIB_VFIO_USER_COMMON_H
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#include <limits.h>
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#include <stdint.h>
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#define UNUSED __attribute__((unused))
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#define EXPORT __attribute__((visibility("default")))
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#define ONE_TB (1024UL * 1024 * 1024 * 1024)
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#define PAGE_SIZE (size_t)sysconf(_SC_PAGE_SIZE)
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#define PAGE_ALIGNED(x) (((x) & ((typeof(x))(PAGE_SIZE) - 1)) == 0)
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#define BIT(nr) (1UL << (nr))
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#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
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#define likely(e) __builtin_expect(!!(e), 1)
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#define unlikely(e) __builtin_expect(e, 0)
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/* XXX NB 2nd argument must be power of two */
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#define ROUND_DOWN(x, a) ((x) & ~((a)-1))
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#define ROUND_UP(x,a) ROUND_DOWN((x)+(a)-1, a)
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/* Saturating uint64_t addition. */
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static inline uint64_t
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satadd_u64(uint64_t a, uint64_t b)
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{
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uint64_t res = a + b;
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return (res < a) ? UINT64_MAX : res;
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}
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/*
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* The size, in bytes, of the bitmap that represents the given range with the
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* given page size.
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*/
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static inline size_t
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_get_bitmap_size(size_t size, size_t pgsize)
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{
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size_t nr_pages = (size / pgsize) + (size % pgsize != 0);
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return ROUND_UP(nr_pages, sizeof(uint64_t) * CHAR_BIT) / CHAR_BIT;
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}
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#ifdef UNIT_TEST
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#define MOCK_DEFINE(f) \
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(__real_ ## f)
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#define MOCK_DECLARE(r, f, ...) \
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r f(__VA_ARGS__); \
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r __real_ ## f(__VA_ARGS__); \
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r __wrap_ ## f(__VA_ARGS__);
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#else /* UNIT_TEST */
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#define MOCK_DEFINE(f) (f)
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#define MOCK_DECLARE(r, f, ...) \
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r f(__VA_ARGS__);
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#endif /* UNIT_TEST */
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#endif /* LIB_VFIO_USER_COMMON_H */
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/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */
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