md_root.c revision 1.18
1 /* NetBSD: md_root.c,v 1.17 2002/05/23 14:59:28 leo Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Leo Weppelman. 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Leo Weppelman. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/buf.h> 38 #include <sys/proc.h> 39 #include <sys/device.h> 40 #include <sys/ioctl.h> 41 #include <sys/fcntl.h> 42 #include <sys/conf.h> 43 #include <sys/disklabel.h> 44 #include <sys/disk.h> 45 #include <sys/dkbad.h> 46 47 #include <dev/cons.h> 48 #include <dev/md.h> 49 50 #include <atari/atari/device.h> 51 52 /* 53 * Misc. defines: 54 */ 55 #define RAMD_CHUNK (9 * 512) /* Chunk-size for auto-load */ 56 #define RAMD_NDEV 3 /* Number of devices configured */ 57 58 struct ramd_info { 59 u_long ramd_size; /* Size of disk in bytes */ 60 u_long ramd_flag; /* see defs below */ 61 dev_t ramd_dev; /* device to load from */ 62 }; 63 64 /* 65 * ramd_flag: 66 */ 67 #define RAMD_LOAD 0x01 /* Auto load when first opened */ 68 #define RAMD_LCOMP 0x02 /* Input is compressed */ 69 70 struct ramd_info rd_info[RAMD_NDEV] = { 71 { 72 1105920, /* 1Mb in 2160 sectors */ 73 RAMD_LOAD, /* auto-load this device */ 74 MAKEDISKDEV(2, 0, 2), /* XXX: This is crap! (720Kb flop) */ 75 }, 76 { 77 1474560, /* 1.44Mb in 2880 sectors */ 78 RAMD_LOAD, /* auto-load this device */ 79 MAKEDISKDEV(2, 0, 2), /* XXX: This is crap! (720Kb flop) */ 80 }, 81 { 82 1474560, /* 1.44Mb in 2880 sectors */ 83 RAMD_LOAD, /* auto-load this device */ 84 MAKEDISKDEV(2, 0, 3), /* XXX: This is crap! (1.44Mb flop) */ 85 } 86 }; 87 88 struct read_info { 89 struct buf *bp; /* buffer for strategy function */ 90 long nbytes; /* total number of bytes to read */ 91 long offset; /* offset in input medium */ 92 caddr_t bufp; /* current output buffer */ 93 caddr_t ebufp; /* absolute maximum for bufp */ 94 int chunk; /* chunk size on input medium */ 95 int media_sz; /* size of input medium */ 96 void (*strat)(struct buf *); /* strategy function for read */ 97 }; 98 99 100 static int loaddisk __P((struct md_conf *, dev_t ld_dev, struct proc *)); 101 static int ramd_norm_read __P((struct read_info *)); 102 103 #ifdef support_compression 104 static int cpy_uncompressed __P((caddr_t, int, struct read_info *)); 105 static int md_compressed __P((caddr_t, int, struct read_info *)); 106 #endif 107 108 /* 109 * This is called during autoconfig. 110 */ 111 void 112 md_attach_hook(unit, md) 113 int unit; 114 struct md_conf *md; 115 { 116 if (atari_realconfig && (unit < RAMD_NDEV) && rd_info[unit].ramd_flag) { 117 printf ("md%d: %sauto-load on open. Size %ld bytes.\n", unit, 118 rd_info[unit].ramd_flag & RAMD_LCOMP ? "decompress/" : "", 119 rd_info[unit].ramd_size); 120 md->md_type = MD_UNCONFIGURED; /* Paranoia... */ 121 } 122 } 123 124 void 125 md_open_hook(unit, md) 126 int unit; 127 struct md_conf *md; 128 { 129 struct ramd_info *ri; 130 131 if(unit >= RAMD_NDEV) 132 return; 133 134 ri = &rd_info[unit]; 135 if (md->md_type != MD_UNCONFIGURED) 136 return; /* Only configure once */ 137 md->md_addr = malloc(ri->ramd_size, M_DEVBUF, M_WAITOK); 138 md->md_size = ri->ramd_size; 139 if(md->md_addr == NULL) 140 return; 141 if(ri->ramd_flag & RAMD_LOAD) { 142 if (loaddisk(md, ri->ramd_dev, curproc)) { 143 free(md->md_addr, M_DEVBUF); 144 md->md_addr = NULL; 145 return; 146 } 147 } 148 md->md_type = MD_KMEM_ALLOCATED; 149 } 150 151 static int 152 loaddisk(md, ld_dev, proc) 153 struct md_conf *md; 154 dev_t ld_dev; 155 struct proc *proc; 156 { 157 struct buf buf; 158 int error; 159 const struct bdevsw *bdp; 160 struct disklabel dl; 161 struct read_info rs; 162 163 bdp = bdevsw_lookup(ld_dev); 164 if (bdp == NULL) 165 return (ENXIO); 166 167 /* 168 * Initialize our buffer header: 169 */ 170 memset(&buf, 0, sizeof(buf)); 171 buf.b_vnbufs.le_next = NOLIST; 172 buf.b_flags = B_BUSY; 173 buf.b_dev = ld_dev; 174 buf.b_error = 0; 175 buf.b_proc = proc; 176 177 /* 178 * Setup read_info: 179 */ 180 rs.bp = &buf; 181 rs.nbytes = md->md_size; 182 rs.offset = 0; 183 rs.bufp = md->md_addr; 184 rs.ebufp = md->md_addr + md->md_size; 185 rs.chunk = RAMD_CHUNK; 186 rs.media_sz = md->md_size; 187 rs.strat = bdp->d_strategy; 188 189 /* 190 * Open device and try to get some statistics. 191 */ 192 if((error = bdp->d_open(ld_dev, FREAD | FNONBLOCK, 0, proc)) != 0) 193 return(error); 194 if(bdp->d_ioctl(ld_dev, DIOCGDINFO, (caddr_t)&dl, FREAD, proc) == 0) { 195 /* Read on a cylinder basis */ 196 rs.chunk = dl.d_secsize * dl.d_secpercyl; 197 rs.media_sz = dl.d_secperunit * dl.d_secsize; 198 } 199 200 #ifdef support_compression 201 if(ri->ramd_flag & RAMD_LCOMP) 202 error = decompress(cpy_uncompressed, md_compressed, &rs); 203 else 204 #endif /* support_compression */ 205 error = ramd_norm_read(&rs); 206 207 bdp->d_close(ld_dev,FREAD | FNONBLOCK, 0, proc); 208 return(error); 209 } 210 211 static int 212 ramd_norm_read(rsp) 213 struct read_info *rsp; 214 { 215 long bytes_left; 216 int done, error; 217 struct buf *bp; 218 int s; 219 int dotc = 0; 220 221 bytes_left = rsp->nbytes; 222 bp = rsp->bp; 223 error = 0; 224 225 while(bytes_left > 0) { 226 s = splbio(); 227 bp->b_flags = B_BUSY | B_PHYS | B_READ; 228 splx(s); 229 bp->b_blkno = btodb(rsp->offset); 230 bp->b_bcount = rsp->chunk; 231 bp->b_data = rsp->bufp; 232 233 /* Initiate read */ 234 (*rsp->strat)(bp); 235 236 /* Wait for results */ 237 s = splbio(); 238 while ((bp->b_flags & B_DONE) == 0) 239 tsleep((caddr_t) bp, PRIBIO + 1, "ramd_norm_read", 0); 240 if (bp->b_flags & B_ERROR) 241 error = (bp->b_error ? bp->b_error : EIO); 242 splx(s); 243 244 /* Dot counter */ 245 printf("."); 246 if(!(++dotc % 40)) 247 printf("\n"); 248 249 done = bp->b_bcount - bp->b_resid; 250 bytes_left -= done; 251 rsp->offset += done; 252 rsp->bufp += done; 253 254 if(error || !done) 255 break; 256 257 if((rsp->offset == rsp->media_sz) && (bytes_left != 0)) { 258 printf("\nInsert next media and hit any key..."); 259 cngetc(); 260 printf("\n"); 261 rsp->offset = 0; 262 } 263 } 264 printf("\n"); 265 return(error); 266 } 267 268 #ifdef support_compression 269 /* 270 * Functions supporting uncompression: 271 */ 272 /* 273 * Copy from the uncompression buffer to the ramdisk 274 */ 275 static int 276 cpy_uncompressed(buf, nbyte, rsp) 277 caddr_t buf; 278 struct read_info *rsp; 279 int nbyte; 280 { 281 if((rsp->bufp + nbyte) >= rsp->ebufp) 282 return(0); 283 bcopy(buf, rsp->bufp, nbyte); 284 rsp->bufp += nbyte; 285 return(0); 286 } 287 288 /* 289 * Read a maximum of 'nbyte' bytes into 'buf'. 290 */ 291 static int 292 md_compressed(buf, nbyte, rsp) 293 caddr_t buf; 294 struct read_info *rsp; 295 int nbyte; 296 { 297 static int dotc = 0; 298 struct buf *bp; 299 int nread = 0; 300 int s; 301 int done, error; 302 303 304 error = 0; 305 bp = rsp->bp; 306 nbyte &= ~(DEV_BSIZE - 1); 307 308 while(nbyte > 0) { 309 s = splbio(); 310 bp->b_flags = B_BUSY | B_PHYS | B_READ; 311 splx(s); 312 bp->b_blkno = btodb(rsp->offset); 313 bp->b_bcount = min(rsp->chunk, nbyte); 314 bp->b_data = buf; 315 316 /* Initiate read */ 317 (*rsp->strat)(bp); 318 319 /* Wait for results */ 320 s = splbio(); 321 while ((bp->b_flags & B_DONE) == 0) 322 tsleep((caddr_t) bp, PRIBIO + 1, "ramd_norm_read", 0); 323 if (bp->b_flags & B_ERROR) 324 error = (bp->b_error ? bp->b_error : EIO); 325 splx(s); 326 327 /* Dot counter */ 328 printf("."); 329 if(!(++dotc % 40)) 330 printf("\n"); 331 332 done = bp->b_bcount - bp->b_resid; 333 nbyte -= done; 334 nread += done; 335 rsp->offset += done; 336 337 if(error || !done) 338 break; 339 340 if((rsp->offset == rsp->media_sz) && (nbyte != 0)) { 341 if(rsp->offset == rsp->media_sz) { 342 printf("\nInsert next media and hit any key..."); 343 if(cngetc() != '\n') 344 printf("\n"); 345 rsp->offset = 0; 346 } 347 } 348 s = splbio(); 349 splx(s); 350 return(nread); 351 } 352 #endif /* support_compression */ 353
Indexes created Thu Sep 25 08:09:54 GMT 2025