4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync/* $NetBSD: bswap64.c,v 1.1 2005/12/20 19:28:51 christos Exp $ */
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync/*
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync * Written by Manuel Bouyer <bouyer@NetBSD.org>.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync * Public domain.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync */
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync//#include <sys/cdefs.h>
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync//#if defined(LIBC_SCCS) && !defined(lint)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync//__RCSID("$NetBSD: bswap64.c,v 1.1 2005/12/20 19:28:51 christos Exp $");
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync//#endif /* LIBC_SCCS and not lint */
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync//#include <sys/types.h>
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync//#include <machine/bswap.h>
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#undef bswap64
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncUINT64
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncbswap64(UINT64 x)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync{
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#ifndef _LP64
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync /*
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync * Assume we have wide enough registers to do it without touching
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync * memory.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync */
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync return ( (x << 56) & 0xff00000000000000UL ) |
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ( (x << 40) & 0x00ff000000000000UL ) |
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ( (x << 24) & 0x0000ff0000000000UL ) |
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ( (x << 8) & 0x000000ff00000000UL ) |
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ( (x >> 8) & 0x00000000ff000000UL ) |
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ( (x >> 24) & 0x0000000000ff0000UL ) |
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ( (x >> 40) & 0x000000000000ff00UL ) |
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync ( (x >> 56) & 0x00000000000000ffUL );
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#else
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync /*
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync * Split the operation in two 32bit steps.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync */
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync u_int32_t tl, th;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync th = bswap32((u_int32_t)(x & 0x00000000ffffffffULL));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync tl = bswap32((u_int32_t)((x >> 32) & 0x00000000ffffffffULL));
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync return ((u_int64_t)th << 32) | tl;
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#endif
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync}