1 /* $NetBSD: dkwedge_tos.c,v 1.2 2024/04/06 09:51:34 hannken Exp $ */ 2 3 /* 4 * Copyright (c) 2024 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charlotte Koch. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * dk(4) support for Atari "TOS" partition schemes. 34 * 35 * Technical details taken from: 36 * 37 * - "Atari Hard Disk File Systems Reference Guide" v1.2b by Jean 38 * Louis-Guerin (DrCoolZic) (September 2014) 39 * 40 * https://info-coach.fr/atari/documents/_mydoc/Atari_HD_File_Sytem_Reference_Guide.pdf 41 */ 42 43 #include <sys/buf.h> 44 #include <sys/disk.h> 45 #include <sys/endian.h> 46 #include <sys/vnode.h> 47 48 #define TOS_PART_TYPE_LEN 3 49 #define TOS_GEM_PARTITION "GEM" 50 #define TOS_BGM_PARTITION "BGM" 51 #define TOS_XGM_PARTITION "XGM" 52 53 #define TOS_CXNMETHOD_SASI 0x00 54 #define TOS_CXNMETHOD_SCSI 0xFF 55 56 #define TOS_MAX_PART_COUNT 4 57 #define TOS_SECTOR_SIZE 512 58 59 struct tos_partition { 60 uint8_t status; 61 char type[TOS_PART_TYPE_LEN]; 62 uint32_t offset; 63 uint32_t size; 64 } __packed; 65 __CTASSERT(sizeof(struct tos_partition) == 12); 66 67 struct tos_root_sector { 68 uint8_t unused1[441]; 69 uint8_t connection_method; 70 uint8_t unused2[8]; 71 uint32_t size; 72 struct tos_partition parts[TOS_MAX_PART_COUNT]; 73 uint8_t unused3[10]; 74 } __packed; 75 __CTASSERT(sizeof(struct tos_root_sector) == TOS_SECTOR_SIZE); 76 77 static int dkwedge_discover_tos(struct disk *pdk, struct vnode *vp); 78 79 static int 80 dkwedge_discover_tos(struct disk *pdk, struct vnode *vp) 81 { 82 struct dkwedge_info dkw; 83 int error = 0; 84 size_t i; 85 char safe_type[4]; 86 87 /* Get ourselves a fistful of memory. */ 88 buf_t *bp = geteblk(TOS_SECTOR_SIZE); 89 90 error = dkwedge_read(pdk, vp, 0L, bp->b_data, TOS_SECTOR_SIZE); 91 if (error) { 92 aprint_error("unable to read TOS Root Sector: error = %d", 93 error); 94 goto out; 95 } 96 97 struct tos_root_sector *trs = bp->b_data; 98 99 /* 100 * If the "connection method" isn't recognized, then this is 101 * probably NOT an Atari-style partition, so get outta here. Note 102 * that there really isn't a magic number we can rely on; this check 103 * is somewhat made up. But at least it's better than nothing. 104 */ 105 switch (trs->connection_method) { 106 case TOS_CXNMETHOD_SASI: /* FALLTHROUGH */ 107 case TOS_CXNMETHOD_SCSI: 108 ; /* OK */ 109 break; 110 default: 111 error = ESRCH; 112 goto out; 113 } 114 115 /* 116 * Make a wedge for each partition that exists (i.e., has the "exist" 117 * bit set). 118 */ 119 for (i = 0; i < TOS_MAX_PART_COUNT; i++) { 120 struct tos_partition part = trs->parts[i]; 121 122 if (!(part.status & 0x01)) 123 continue; 124 125 /* Ignore if we see it's an extended "XGM" partition. */ 126 if (!strncmp(part.type, TOS_XGM_PARTITION, TOS_PART_TYPE_LEN)) { 127 aprint_normal( 128 "WARNING: XGM partitions are not yet supported\n"); 129 continue; 130 } 131 132 /* 133 * Otherwise, get outta here if it's not the partition-types 134 * we *do* support. 135 */ 136 if (strncmp(part.type, TOS_GEM_PARTITION, TOS_PART_TYPE_LEN) && 137 strncmp(part.type, TOS_BGM_PARTITION, TOS_PART_TYPE_LEN)) { 138 error = ESRCH; 139 goto out; 140 } 141 142 memset(&dkw, 0, sizeof(dkw)); 143 memset(safe_type, 0, sizeof(safe_type)); 144 145 /* 146 * The partition type string is NOT NUL-terminated, so let's 147 * play it safe. 148 */ 149 memcpy(safe_type, part.type, TOS_PART_TYPE_LEN); 150 safe_type[TOS_PART_TYPE_LEN] = '\0'; 151 152 /* Finally, make the wedge. */ 153 snprintf(dkw.dkw_wname, sizeof(dkw.dkw_wname), "ATARI_%s_%02zu", 154 safe_type, i); 155 dkw.dkw_offset = be32toh(trs->parts[i].offset); 156 dkw.dkw_size = be32toh(trs->parts[i].size); 157 strlcpy(dkw.dkw_ptype, DKW_PTYPE_FAT, sizeof(dkw.dkw_ptype)); 158 strlcpy(dkw.dkw_parent, pdk->dk_name, sizeof(dkw.dkw_parent)); 159 error = dkwedge_add(&dkw); 160 161 if (error == EEXIST) { 162 aprint_error("partition named \"%s\" already exists", 163 dkw.dkw_wname); 164 goto out; 165 } 166 } 167 168 error = 0; 169 170 out: 171 brelse(bp, 0); 172 return error; 173 } 174 175 DKWEDGE_DISCOVERY_METHOD_DECL(TOS, 10, dkwedge_discover_tos); 176
Indexes created Mon Sep 22 05:09:51 GMT 2025