/* $NetBSD: v7fs_endian.c,v 1.3 2026/01/06 10:53:10 nia Exp $ */ /*- * Copyright (c) 2011 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by UCHIYAMA Yasushi. * * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ #if HAVE_NBTOOL_CONFIG_H #include "nbtool_config.h" #endif #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: v7fs_endian.c,v 1.3 2026/01/06 10:53:10 nia Exp $"); #include <sys/endian.h> #if defined _KERNEL_OPT #include "opt_v7fs.h" #endif #include "v7fs.h" #include "v7fs_endian.h" #include "v7fs_impl.h" #ifndef BYTE_ORDER #error #endif /* PDP to Little */ #define bswap32pdp_le(x) \ ((uint32_t) \ ((((x) & 0xffff0000) >> 16) | \ (((x) & 0x0000ffff) << 16))) /* PDP to Big */ #define bswap32pdp_be(x) \ ((uint32_t) \ ((((x) & 0xff00ff00) >> 8) | \ (((x) & 0x00ff00ff) << 8))) #ifdef V7FS_EI static uint32_t val32_normal_order(uint32_t); static uint32_t val32_reverse_order(uint32_t); #if BYTE_ORDER == LITTLE_ENDIAN static uint32_t val32_pdp_to_little(uint32_t); #else static uint32_t val32_pdp_to_big(uint32_t); #endif static uint16_t val16_normal_order(uint16_t); static uint16_t val16_reverse_order(uint16_t); static v7fs_daddr_t val24_reverse_order_read(uint8_t *); static void val24_reverse_order_write(v7fs_daddr_t, uint8_t *); static v7fs_daddr_t val24_pdp_read(uint8_t *); static void val24_pdp_write(v7fs_daddr_t, uint8_t *); static uint32_t val32_normal_order(uint32_t v) { return v; } static uint32_t val32_reverse_order(uint32_t v) { return bswap32(v); } #if BYTE_ORDER == LITTLE_ENDIAN static uint32_t val32_pdp_to_little(uint32_t v) { return bswap32pdp_le(v); } #else static uint32_t val32_pdp_to_big(uint32_t v) { return bswap32pdp_be(v); } #endif static uint16_t val16_normal_order(uint16_t v) { return v; } static uint16_t val16_reverse_order(uint16_t v) { return bswap16(v); } static v7fs_daddr_t val24_reverse_order_read(uint8_t *a) { #if BYTE_ORDER == LITTLE_ENDIAN return (a[0] << 16) | (a[1] << 8) | a[2]; #else return (a[2] << 16) | (a[1] << 8) | a[0]; #endif } static void val24_reverse_order_write(v7fs_daddr_t addr, uint8_t *a) { #if BYTE_ORDER == LITTLE_ENDIAN a[0] = (addr >> 16) & 0xff; a[1] = (addr >> 8) & 0xff; a[2] = addr & 0xff; #else a[0] = addr & 0xff; a[1] = (addr >> 8) & 0xff; a[2] = (addr >> 16) & 0xff; #endif } static v7fs_daddr_t val24_pdp_read(uint8_t *a) { return (a[0] << 16) | a[1] | (a[2] << 8); } static void val24_pdp_write(v7fs_daddr_t addr, uint8_t *a) { a[0] = (addr >> 16) & 0xff; a[1] = addr & 0xff; a[2] = (addr >> 8) & 0xff; } void v7fs_endian_init(struct v7fs_self *fs) { struct endian_conversion_ops *ops = &fs->val; switch (fs->endian) { #if BYTE_ORDER == LITTLE_ENDIAN case LITTLE_ENDIAN: ops->conv32 = val32_normal_order; ops->conv16 = val16_normal_order; ops->conv24read = val24_normal_order_read; ops->conv24write = val24_normal_order_write; break; case BIG_ENDIAN: ops->conv32 = val32_reverse_order; ops->conv16 = val16_reverse_order; ops->conv24read = val24_reverse_order_read; ops->conv24write = val24_reverse_order_write; break; case PDP_ENDIAN: ops->conv32 = val32_pdp_to_little; ops->conv16 = val16_normal_order; ops->conv24read = val24_pdp_read; ops->conv24write = val24_pdp_write; break; #else /* BIG_ENDIAN */ case LITTLE_ENDIAN: ops->conv32 = val32_reverse_order; ops->conv16 = val16_reverse_order; ops->conv24read = val24_reverse_order_read; ops->conv24write = val24_reverse_order_write; break; case BIG_ENDIAN: ops->conv32 = val32_normal_order; ops->conv16 = val16_normal_order; ops->conv24read = val24_normal_order_read; ops->conv24write = val24_normal_order_write; break; case PDP_ENDIAN: ops->conv32 = val32_pdp_to_big; ops->conv16 = val16_reverse_order; ops->conv24read = val24_pdp_read; ops->conv24write = val24_pdp_write; break; #endif } } #endif /* V7FS_EI */ v7fs_daddr_t val24_normal_order_read(uint8_t *a) { /*(v7fs_daddr_t)cast is required for int 16bit system. */ #if BYTE_ORDER == LITTLE_ENDIAN return ((v7fs_daddr_t)a[2] << 16) | ((v7fs_daddr_t)a[1] << 8) | (v7fs_daddr_t)a[0]; #else return ((v7fs_daddr_t)a[0] << 16) | ((v7fs_daddr_t)a[1] << 8) | (v7fs_daddr_t)a[2]; #endif } void val24_normal_order_write(v7fs_daddr_t addr, uint8_t *a) { #if BYTE_ORDER == LITTLE_ENDIAN a[0] = addr & 0xff; a[1] = (addr >> 8) & 0xff; a[2] = (addr >> 16) & 0xff; #else a[0] = (addr >> 16) & 0xff; a[1] = (addr >> 8) & 0xff; a[2] = addr & 0xff; #endif }
