sdcd.c revision 1.2
1/* $NetBSD: sdcd.c,v 1.2 2001/09/29 03:50:13 minoura Exp $ */ 2 3/* 4 * Copyright (c) 2001 MINOURA Makoto. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include <sys/param.h> 29#include <sys/disklabel.h> 30#include <lib/libkern/libkern.h> 31#include <lib/libsa/stand.h> 32 33#include "sdcdvar.h" 34#include "iocs.h" 35 36 37static int current_id = -1; 38static int current_blklen, current_devsize, current_npart; 39static struct boot_partinfo partitions[MAXPARTITIONS]; 40 41static int readdisklabel(int); 42static int check_unit(int); 43 44#ifdef DEBUG 45#define DPRINTF(x) printf x 46#else 47#define DPRINTF(x) 48#endif 49#define alloca __builtin_alloca 50 51static int 52check_unit(int id) 53{ 54#define BUFFER_SIZE 8192 55 int error; 56 void *buffer = alloca(BUFFER_SIZE); 57 58 if (current_id == id) 59 return 0; 60 61 current_id = -1; 62 63 error = IOCS_S_TESTUNIT(id); 64 if (error < 0) { /* not ready */ 65 error = ENXIO; 66 goto out; 67 } 68 69 { 70 struct iocs_inquiry *inqdata = buffer; 71 72 error = IOCS_S_INQUIRY(100, id, inqdata); 73 if (error < 0) { /* WHY??? */ 74 error = ENXIO; 75 goto out; 76 } 77 if ((inqdata->unit != 0) && /* direct */ 78 (inqdata->unit != 7)) { /* optical */ 79 error = EUNIT; 80 goto out; 81 } 82 } 83 84 { 85 struct iocs_readcap *rcdata = buffer; 86 87 error = IOCS_S_READCAP(id, rcdata); 88 if (error < 0) { /* WHY??? */ 89 error = EUNIT; 90 goto out; 91 } 92 current_blklen = rcdata->size >> 9; 93 current_devsize = rcdata->block; 94 } 95 96 { 97 error = IOCS_S_READ(0, 1, id, current_blklen, buffer); 98 if (error < 0) { 99 error = EIO; 100 goto out; 101 } 102 if (strncmp((char*) buffer, "X68SCSI1", 8) != 0) { 103 error = EUNLAB; 104 goto out; 105 } 106 } 107 108 out: 109 return error; 110} 111 112static int 113readdisklabel (int id) 114{ 115 int error, i; 116 char *buffer; 117 struct disklabel *label; 118 struct dos_partition *parttbl; 119 120 if (current_id == id) 121 return 0; 122 current_id = -1; 123 124 error = check_unit(id); 125 if (error) 126 return error; 127 if (current_blklen > 4) { 128 printf ("FATAL: Unsupported block size %d.\n", 129 256 << current_blklen); 130 return ERDLAB; 131 } 132 133 /* Try BSD disklabel first */ 134 buffer = alloca(2048); 135 error = IOCS_S_READ(LABELSECTOR, 1, id, current_blklen, buffer); 136 if (error < 0) 137 return EIO; 138 label = (void*) (buffer + LABELOFFSET); 139 if (label->d_magic == DISKMAGIC && 140 label->d_magic2 == DISKMAGIC) { 141 for (i = 0; i < label->d_npartitions; i++) { 142 partitions[i].start = label->d_partitions[i].p_offset; 143 partitions[i].size = label->d_partitions[i].p_size; 144 } 145 current_npart = label->d_npartitions; 146 147 return 0; 148 } 149 150 /* Try Human68K-style partition table */ 151#if 0 152 /* assumes 512byte/sec */ 153 error = IOCS_S_READ(DOSPARTOFF, 2, id, current_blklen, buffer); 154#else 155 error = IOCS_S_READ(8 >> current_blklen, 8 >> current_blklen, 156 id, current_blklen, buffer); 157#endif 158 if (error < 0) 159 return EIO; 160 parttbl = (void*) (buffer + DOSBBSECTOR); 161 if (strncmp (buffer, "X68K", 4) != 0) 162 return EUNLAB; 163 parttbl++; 164 for (current_npart = 0, i = 0; 165 current_npart < MAXPARTITIONS && i < 15 && parttbl[i].dp_size; 166 i++) { 167 partitions[current_npart].start 168 = parttbl[i].dp_start * 2; 169 partitions[current_npart].size 170 = parttbl[i].dp_size * 2; 171 if (++current_npart == RAW_PART) { 172 partitions[current_npart].start = 0; 173 partitions[current_npart].size = -1; /* XXX */ 174 current_npart++; 175 } 176 } 177#ifdef DEBUG 178 for (i = 0; i < current_npart; i++) { 179 printf ("%d: starts %d, size %d\n", i, 180 partitions[i].start, 181 partitions[i].size); 182 } 183#endif 184 current_id = id; 185 186 return 0; 187} 188 189int 190sd_getbsdpartition (int id, int humanpart) 191{ 192 int error, i; 193 char *buffer; 194 struct dos_partition *parttbl; 195 unsigned parttop; 196 197 if (humanpart < 2) 198 humanpart++; 199 200 error = readdisklabel(id); 201 if (error) { 202 printf ("Reading disklabel: %s\n", strerror(error)); 203 return -1; 204 } 205 buffer = alloca(2048); 206 error = IOCS_S_READ(8 >> current_blklen, 8 >> current_blklen, 207 id, current_blklen, buffer); 208 if (error < 0) { 209 printf ("Reading partition table: %s\n", strerror(error)); 210 return -1; 211 } 212 parttbl = (void*) (buffer + DOSBBSECTOR); 213 if (strncmp (buffer, "X68K", 4) != 0) 214 return 0; 215 parttop = parttbl[humanpart].dp_start; 216 parttop = parttop<<(2-current_blklen); 217 218 for (i = 0; i < current_npart; i++) { 219 if (partitions[i].start == parttop) 220 return i; 221 } 222 223 printf ("Could not determine the boot partition.\n"); 224 225 return -1; 226} 227 228struct sdcd_softc { 229 int sc_part; 230 struct boot_partinfo sc_partinfo; 231 int sc_blocksize; 232}; 233 234int 235sdopen (struct open_file *f, int id, int part) 236{ 237 int error; 238 struct sdcd_softc *sc; 239 240 if (id < 0 || id > 7) 241 return ENXIO; 242 if (current_id != id) { 243 error = readdisklabel(id); 244 if (error) 245 return error; 246 } 247 if (part >= current_npart) 248 return ENXIO; 249 250 sc = alloc (sizeof (struct sdcd_softc)); 251 sc->sc_part = part; 252 sc->sc_partinfo = partitions[part]; 253 sc->sc_blocksize = current_blklen << 9; 254 f->f_devdata = sc; 255 return 0; 256} 257 258int 259sdclose (struct open_file *f) 260{ 261 free (f->f_devdata, sizeof (struct sdcd_softc)); 262 return 0; 263} 264 265int 266sdstrategy (void *arg, int rw, daddr_t dblk, size_t size, 267 void *buf, size_t *rsize) 268{ 269 struct sdcd_softc *sc = arg; 270 u_int32_t start = sc->sc_partinfo.start + dblk; 271 size_t nblks; 272 int error; 273 274 if (size == 0) { 275 if (rsize) 276 *rsize = 0; 277 return 0; 278 } 279 nblks = howmany (size, 256 << current_blklen); 280 281 if (dblk & 0x1fffff == 0x1fffff && (nblks & 0xff) == nblks) { 282 if (rw & F_WRITE) 283 error = IOCS_S_WRITE (start, nblks, current_id, 284 current_blklen, buf); 285 else 286 error = IOCS_S_READ (start, nblks, current_id, 287 current_blklen, buf); 288 } else { 289 if (rw & F_WRITE) 290 error = IOCS_S_WRITEEXT (start, nblks, current_id, 291 current_blklen, buf); 292 else 293 error = IOCS_S_READEXT (start, nblks, current_id, 294 current_blklen, buf); 295 } 296 if (error < 0) 297 return EIO; 298 299 if (rsize) 300 *rsize = size; 301 return 0; 302} 303 304int 305cdopen (struct open_file *f, int id, int part) 306{ 307 int error; 308 struct sdcd_softc *sc; 309 310 if (id < 0 || id > 7) 311 return ENXIO; 312 if (part == 0 || part == 2) 313 return ENXIO; 314 if (current_id != id) { 315 error = check_unit(id); 316 if (error) 317 return error; 318 } 319 320 sc = alloc (sizeof (struct sdcd_softc)); 321 current_npart = 3; 322 sc->sc_part = 0; 323 sc->sc_partinfo.size = sc->sc_partinfo.size = current_devsize; 324 sc->sc_blocksize = current_blklen << 9; 325 f->f_devdata = sc; 326 return 0; 327} 328 329int 330cdclose (struct open_file *f) 331{ 332 free (f->f_devdata, sizeof (struct sdcd_softc)); 333 return 0; 334} 335 336int 337cdstrategy (void *arg, int rw, daddr_t dblk, size_t size, 338 void *buf, size_t *rsize) 339{ 340 struct sdcd_softc *sc = arg; 341 342 return sdstrategy (arg, rw, dblk * DEV_BSIZE / sc->sc_blocksize, 343 size, buf, rsize); 344} 345