Index: head/sys/contrib/zstd/lib/freebsd/zstd_kfreebsd.c
===================================================================
--- head/sys/contrib/zstd/lib/freebsd/zstd_kfreebsd.c	(revision 327806)
+++ head/sys/contrib/zstd/lib/freebsd/zstd_kfreebsd.c	(revision 327807)
@@ -1,75 +1,89 @@
 /*-
  * Copyright (c) 2018 Conrad Meyer <cem@freebsd.org>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * $FreeBSD$
  */
 
 #include "zstd_kfreebsd.h"
+#include <sys/endian.h>
 
 /*
  * The kernel as a standalone target does not link against libgcc or
  * libcompiler-rt. On platforms (e.g., MIPS and RISCV) that do not have a
  * direct assembly implementation of the relevant builtin functions that zstd
  * references, the compiler converts them into calls to the runtime library
  * intrinsics.  Since the kernel does not link against the runtime libraries,
  * this results in a failure to link the kernel.
  *
  * The goal of the following definitions is to use supported kernel constructs
  * to implement the same functionality, without adding diff to the Zstd contrib
  * code.
  *
  * A subsequent enhancement might create a mini compiler-rt library for kernel
  * use and move these over there instead.
  */
+
+/* Swap endianness */
+int
+__bswapsi2(int x)
+{
+	return (bswap32(x));
+}
+
+long long
+__bswapdi2(long long x)
+{
+	return (bswap64(x));
+}
 
 /* Count trailing zeros */
 int
 __ctzsi2(int x)
 {
        if (x == 0)
                return (sizeof(x) * NBBY);
        return (ffs(x) - 1);
 }
 
 long long
 __ctzdi2(long long x)
 {
        if (x == 0)
                return (sizeof(x) * NBBY);
        return (ffsll(x) - 1);
 }
 
 /* Count leading zeros */
 int
 __clzsi2(int x)
 {
        return (sizeof(x) * NBBY - fls(x));
 }
 
 long long
 __clzdi2(long long x)
 {
        return (sizeof(x) * NBBY - flsll(x));
 }