xref: /netbsd-src/sys/fs/v7fs/v7fs_endian.c (revision f1ca1ce2bf561c65d8d08b5a57f1979f43f5aa7f)
1*f1ca1ce2Sapb /*	$NetBSD: v7fs_endian.c,v 1.2 2011/07/18 21:51:49 apb Exp $	*/
29255b46fSuch 
39255b46fSuch /*-
49255b46fSuch  * Copyright (c) 2011 The NetBSD Foundation, Inc.
59255b46fSuch  * All rights reserved.
69255b46fSuch  *
79255b46fSuch  * This code is derived from software contributed to The NetBSD Foundation
89255b46fSuch  * by UCHIYAMA Yasushi.
99255b46fSuch  *
109255b46fSuch  * Redistribution and use in source and binary forms, with or without
119255b46fSuch  * modification, are permitted provided that the following conditions
129255b46fSuch  * are met:
139255b46fSuch  * 1. Redistributions of source code must retain the above copyright
149255b46fSuch  *    notice, this list of conditions and the following disclaimer.
159255b46fSuch  * 2. Redistributions in binary form must reproduce the above copyright
169255b46fSuch  *    notice, this list of conditions and the following disclaimer in the
179255b46fSuch  *    documentation and/or other materials provided with the distribution.
189255b46fSuch  *
199255b46fSuch  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
209255b46fSuch  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
219255b46fSuch  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
229255b46fSuch  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
239255b46fSuch  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
249255b46fSuch  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
259255b46fSuch  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
269255b46fSuch  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
279255b46fSuch  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
289255b46fSuch  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
299255b46fSuch  * POSSIBILITY OF SUCH DAMAGE.
309255b46fSuch  */
319255b46fSuch 
32*f1ca1ce2Sapb #if HAVE_NBTOOL_CONFIG_H
33*f1ca1ce2Sapb #include "nbtool_config.h"
34*f1ca1ce2Sapb #endif
35*f1ca1ce2Sapb 
369255b46fSuch #include <sys/cdefs.h>
37*f1ca1ce2Sapb __KERNEL_RCSID(0, "$NetBSD: v7fs_endian.c,v 1.2 2011/07/18 21:51:49 apb Exp $");
389255b46fSuch #if defined _KERNEL_OPT
399255b46fSuch #include "opt_v7fs.h"
409255b46fSuch #endif
419255b46fSuch 
429255b46fSuch #include "v7fs.h"
439255b46fSuch #include "v7fs_endian.h"
449255b46fSuch #include "v7fs_impl.h"
459255b46fSuch 
469255b46fSuch #ifndef BYTE_ORDER
479255b46fSuch #error
489255b46fSuch #endif
499255b46fSuch 
509255b46fSuch /* PDP to Little */
519255b46fSuch #define	bswap32pdp_le(x)			\
529255b46fSuch 	((uint32_t)				\
539255b46fSuch 	    ((((x) & 0xffff0000) >> 16) |	\
549255b46fSuch 		(((x) & 0x0000ffff) << 16)))
559255b46fSuch /* PDP to Big */
569255b46fSuch #define	bswap32pdp_be(x)			\
579255b46fSuch 	((uint32_t)				\
589255b46fSuch 	    ((((x) & 0xff00ff00) >> 8) |	\
599255b46fSuch 		(((x) & 0x00ff00ff) <<  8)))
609255b46fSuch #ifdef V7FS_EI
619255b46fSuch static uint32_t val32_normal_order(uint32_t);
629255b46fSuch static uint32_t val32_reverse_order(uint32_t);
639255b46fSuch #if BYTE_ORDER == LITTLE_ENDIAN
649255b46fSuch static uint32_t val32_pdp_to_little(uint32_t);
659255b46fSuch #else
669255b46fSuch static uint32_t val32_pdp_to_big(uint32_t);
679255b46fSuch #endif
689255b46fSuch static uint16_t val16_normal_order(uint16_t);
699255b46fSuch static uint16_t val16_reverse_order(uint16_t);
709255b46fSuch static v7fs_daddr_t val24_reverse_order_read(uint8_t *);
719255b46fSuch static void val24_reverse_order_write(v7fs_daddr_t, uint8_t *);
729255b46fSuch static v7fs_daddr_t val24_pdp_read(uint8_t *);
739255b46fSuch static void val24_pdp_write(v7fs_daddr_t, uint8_t *);
749255b46fSuch 
759255b46fSuch static uint32_t
val32_normal_order(uint32_t v)769255b46fSuch val32_normal_order(uint32_t v)
779255b46fSuch {
789255b46fSuch 
799255b46fSuch 	return v;
809255b46fSuch }
819255b46fSuch 
829255b46fSuch static uint32_t
val32_reverse_order(uint32_t v)839255b46fSuch val32_reverse_order(uint32_t v)
849255b46fSuch {
859255b46fSuch 
869255b46fSuch 	return bswap32(v);
879255b46fSuch }
889255b46fSuch #if BYTE_ORDER == LITTLE_ENDIAN
899255b46fSuch static uint32_t
val32_pdp_to_little(uint32_t v)909255b46fSuch val32_pdp_to_little(uint32_t v)
919255b46fSuch {
929255b46fSuch 
939255b46fSuch 	return bswap32pdp_le(v);
949255b46fSuch }
959255b46fSuch #else
969255b46fSuch static uint32_t
val32_pdp_to_big(uint32_t v)979255b46fSuch val32_pdp_to_big(uint32_t v)
989255b46fSuch {
999255b46fSuch 
1009255b46fSuch 	return bswap32pdp_be(v);
1019255b46fSuch }
1029255b46fSuch #endif
1039255b46fSuch static uint16_t
val16_normal_order(uint16_t v)1049255b46fSuch val16_normal_order(uint16_t v)
1059255b46fSuch {
1069255b46fSuch 
1079255b46fSuch 	return v;
1089255b46fSuch }
1099255b46fSuch 
1109255b46fSuch static uint16_t
val16_reverse_order(uint16_t v)1119255b46fSuch val16_reverse_order(uint16_t v)
1129255b46fSuch {
1139255b46fSuch 
1149255b46fSuch 	return bswap16(v);
1159255b46fSuch }
1169255b46fSuch 
1179255b46fSuch static v7fs_daddr_t
val24_reverse_order_read(uint8_t * a)1189255b46fSuch val24_reverse_order_read(uint8_t *a)
1199255b46fSuch {
1209255b46fSuch #if BYTE_ORDER == LITTLE_ENDIAN
1219255b46fSuch 	return (a[0] << 16) | (a[1] << 8) | a[2];
1229255b46fSuch #else
1239255b46fSuch 	return (a[2] << 16) | (a[1] << 8) | a[0];
1249255b46fSuch #endif
1259255b46fSuch }
1269255b46fSuch 
1279255b46fSuch static void
val24_reverse_order_write(v7fs_daddr_t addr,uint8_t * a)1289255b46fSuch val24_reverse_order_write(v7fs_daddr_t addr, uint8_t *a)
1299255b46fSuch {
1309255b46fSuch #if BYTE_ORDER == LITTLE_ENDIAN
1319255b46fSuch 	a[0] = (addr >> 16) & 0xff;
1329255b46fSuch 	a[1] = (addr >> 8) & 0xff;
1339255b46fSuch 	a[2] = addr & 0xff;
1349255b46fSuch #else
1359255b46fSuch 	a[0] = addr & 0xff;
1369255b46fSuch 	a[1] = (addr >> 8) & 0xff;
1379255b46fSuch 	a[2] = (addr >> 16) & 0xff;
1389255b46fSuch #endif
1399255b46fSuch }
1409255b46fSuch 
1419255b46fSuch static v7fs_daddr_t
val24_pdp_read(uint8_t * a)1429255b46fSuch val24_pdp_read(uint8_t *a)
1439255b46fSuch {
1449255b46fSuch 
1459255b46fSuch 	return (a[0] << 16) | a[1] | (a[2] << 8);
1469255b46fSuch }
1479255b46fSuch 
1489255b46fSuch static void
val24_pdp_write(v7fs_daddr_t addr,uint8_t * a)1499255b46fSuch val24_pdp_write(v7fs_daddr_t addr, uint8_t *a)
1509255b46fSuch {
1519255b46fSuch 
1529255b46fSuch 	a[0] = (addr >> 16) & 0xff;
1539255b46fSuch 	a[1] = addr & 0xff;
1549255b46fSuch 	a[2] = (addr >> 8) & 0xff;
1559255b46fSuch }
1569255b46fSuch 
1579255b46fSuch void
v7fs_endian_init(struct v7fs_self * fs)1589255b46fSuch v7fs_endian_init(struct v7fs_self *fs)
1599255b46fSuch {
1609255b46fSuch 	struct endian_conversion_ops *ops = &fs->val;
1619255b46fSuch 
1629255b46fSuch 	switch (fs->endian)
1639255b46fSuch 	{
1649255b46fSuch #if BYTE_ORDER == LITTLE_ENDIAN
1659255b46fSuch 	case LITTLE_ENDIAN:
1669255b46fSuch 		ops->conv32 = val32_normal_order;
1679255b46fSuch 		ops->conv16 = val16_normal_order;
1689255b46fSuch 		ops->conv24read = val24_normal_order_read;
1699255b46fSuch 		ops->conv24write = val24_normal_order_write;
1709255b46fSuch 		break;
1719255b46fSuch 	case BIG_ENDIAN:
1729255b46fSuch 		ops->conv32 = val32_reverse_order;
1739255b46fSuch 		ops->conv16 = val16_reverse_order;
1749255b46fSuch 		ops->conv24read = val24_reverse_order_read;
1759255b46fSuch 		ops->conv24write = val24_reverse_order_write;
1769255b46fSuch 		break;
1779255b46fSuch 	case PDP_ENDIAN:
1789255b46fSuch 		ops->conv32 = val32_pdp_to_little;
1799255b46fSuch 		ops->conv16 = val16_normal_order;
1809255b46fSuch 		ops->conv24read = val24_pdp_read;
1819255b46fSuch 		ops->conv24write = val24_pdp_write;
1829255b46fSuch 		break;
1839255b46fSuch #else /* BIG_ENDIAN */
1849255b46fSuch 	case LITTLE_ENDIAN:
1859255b46fSuch 		ops->conv32 = val32_reverse_order;
1869255b46fSuch 		ops->conv16 = val16_reverse_order;
1879255b46fSuch 		ops->conv24read = val24_reverse_order_read;
1889255b46fSuch 		ops->conv24write = val24_reverse_order_write;
1899255b46fSuch 		break;
1909255b46fSuch 	case BIG_ENDIAN:
1919255b46fSuch 		ops->conv32 = val32_normal_order;
1929255b46fSuch 		ops->conv16 = val16_normal_order;
1939255b46fSuch 		ops->conv24read = val24_normal_order_read;
1949255b46fSuch 		ops->conv24write = val24_normal_order_write;
1959255b46fSuch 		break;
1969255b46fSuch 	case PDP_ENDIAN:
1979255b46fSuch 		ops->conv32 = val32_pdp_to_big;
1989255b46fSuch 		ops->conv16 = val16_reverse_order;
1999255b46fSuch 		ops->conv24read = val24_pdp_read;
2009255b46fSuch 		ops->conv24write = val24_pdp_write;
2019255b46fSuch 		break;
2029255b46fSuch #endif
2039255b46fSuch 	}
2049255b46fSuch }
2059255b46fSuch #endif	/* V7FS_EI */
2069255b46fSuch v7fs_daddr_t
val24_normal_order_read(uint8_t * a)2079255b46fSuch val24_normal_order_read(uint8_t *a)
2089255b46fSuch {
2099255b46fSuch 	/*(v7fs_daddr_t)cast is required for int 16bit system. */
2109255b46fSuch #if BYTE_ORDER == LITTLE_ENDIAN
2119255b46fSuch 	return ((v7fs_daddr_t)a[2] << 16) | ((v7fs_daddr_t)a[1] << 8) |
2129255b46fSuch 	    (v7fs_daddr_t)a[0];
2139255b46fSuch #else
2149255b46fSuch 	return ((v7fs_daddr_t)a[0] << 16) | ((v7fs_daddr_t)a[1] << 8) |
2159255b46fSuch 	    (v7fs_daddr_t)a[2];
2169255b46fSuch #endif
2179255b46fSuch }
2189255b46fSuch 
2199255b46fSuch void
val24_normal_order_write(v7fs_daddr_t addr,uint8_t * a)2209255b46fSuch val24_normal_order_write(v7fs_daddr_t addr, uint8_t *a)
2219255b46fSuch {
2229255b46fSuch #if BYTE_ORDER == LITTLE_ENDIAN
2239255b46fSuch 	a[0] = addr & 0xff;
2249255b46fSuch 	a[1] = (addr >> 8) & 0xff;
2259255b46fSuch 	a[2] = (addr >> 16) & 0xff;
2269255b46fSuch #else
2279255b46fSuch 	a[0] = (addr >> 16) & 0xff;
2289255b46fSuch 	a[1] = (addr >> 8) & 0xff;
2299255b46fSuch 	a[2] = addr & 0xff;
2309255b46fSuch #endif
2319255b46fSuch }
232