90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/*-
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* Copyright (c) 2018 Conrad Meyer <cem@freebsd.org>
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* All rights reserved.
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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
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* are met:
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* 1. 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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* 2. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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 THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER 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
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "zstd_kfreebsd.h"
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#include <sys/endian.h>
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/*
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* The kernel as a standalone target does not link against libgcc or
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* libcompiler-rt. On platforms (e.g., MIPS and RISCV) that do not have a
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* direct assembly implementation of the relevant builtin functions that zstd
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* references, the compiler converts them into calls to the runtime library
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* intrinsics. Since the kernel does not link against the runtime libraries,
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* this results in a failure to link the kernel.
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*
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* The goal of the following definitions is to use supported kernel constructs
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* to implement the same functionality, without adding diff to the Zstd contrib
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* code.
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*
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* A subsequent enhancement might create a mini compiler-rt library for kernel
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* use and move these over there instead.
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*/
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/* Swap endianness */
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int
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__bswapsi2(int x)
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{
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return (bswap32(x));
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}
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long long
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__bswapdi2(long long x)
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{
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return (bswap64(x));
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}
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/* Count trailing zeros */
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int
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__ctzsi2(int x)
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{
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if (x == 0)
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return (sizeof(x) * NBBY);
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return (ffs(x) - 1);
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}
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long long
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__ctzdi2(long long x)
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{
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if (x == 0)
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return (sizeof(x) * NBBY);
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return (ffsll(x) - 1);
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}
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/* Count leading zeros */
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int
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__clzsi2(int x)
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{
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return (sizeof(x) * NBBY - fls(x));
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}
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long long
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__clzdi2(long long x)
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{
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return (sizeof(x) * NBBY - flsll(x));
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}
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