md_root.c revision 1.15.8.4
1 /* $NetBSD: md_root.c,v 1.15.8.4 2002/07/12 01:39:26 nathanw 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 struct bdevsw *bdp = &bdevsw[major(ld_dev)]; 160 struct disklabel dl; 161 struct read_info rs; 162 163 /* 164 * Initialize our buffer header: 165 */ 166 memset(&buf, 0, sizeof(buf)); 167 buf.b_vnbufs.le_next = NOLIST; 168 buf.b_flags = B_BUSY; 169 buf.b_dev = ld_dev; 170 buf.b_error = 0; 171 buf.b_proc = proc; 172 173 /* 174 * Setup read_info: 175 */ 176 rs.bp = &buf; 177 rs.nbytes = md->md_size; 178 rs.offset = 0; 179 rs.bufp = md->md_addr; 180 rs.ebufp = md->md_addr + md->md_size; 181 rs.chunk = RAMD_CHUNK; 182 rs.media_sz = md->md_size; 183 rs.strat = bdp->d_strategy; 184 185 /* 186 * Open device and try to get some statistics. 187 */ 188 if((error = bdp->d_open(ld_dev, FREAD | FNONBLOCK, 0, proc)) != 0) 189 return(error); 190 if(bdp->d_ioctl(ld_dev, DIOCGDINFO, (caddr_t)&dl, FREAD, proc) == 0) { 191 /* Read on a cylinder basis */ 192 rs.chunk = dl.d_secsize * dl.d_secpercyl; 193 rs.media_sz = dl.d_secperunit * dl.d_secsize; 194 } 195 196 #ifdef support_compression 197 if(ri->ramd_flag & RAMD_LCOMP) 198 error = decompress(cpy_uncompressed, md_compressed, &rs); 199 else 200 #endif /* support_compression */ 201 error = ramd_norm_read(&rs); 202 203 bdp->d_close(ld_dev,FREAD | FNONBLOCK, 0, proc); 204 return(error); 205 } 206 207 static int 208 ramd_norm_read(rsp) 209 struct read_info *rsp; 210 { 211 long bytes_left; 212 int done, error; 213 struct buf *bp; 214 int s; 215 int dotc = 0; 216 217 bytes_left = rsp->nbytes; 218 bp = rsp->bp; 219 error = 0; 220 221 while(bytes_left > 0) { 222 s = splbio(); 223 bp->b_flags = B_BUSY | B_PHYS | B_READ; 224 splx(s); 225 bp->b_blkno = btodb(rsp->offset); 226 bp->b_bcount = rsp->chunk; 227 bp->b_data = rsp->bufp; 228 229 /* Initiate read */ 230 (*rsp->strat)(bp); 231 232 /* Wait for results */ 233 s = splbio(); 234 while ((bp->b_flags & B_DONE) == 0) 235 tsleep((caddr_t) bp, PRIBIO + 1, "ramd_norm_read", 0); 236 if (bp->b_flags & B_ERROR) 237 error = (bp->b_error ? bp->b_error : EIO); 238 splx(s); 239 240 /* Dot counter */ 241 printf("."); 242 if(!(++dotc % 40)) 243 printf("\n"); 244 245 done = bp->b_bcount - bp->b_resid; 246 bytes_left -= done; 247 rsp->offset += done; 248 rsp->bufp += done; 249 250 if(error || !done) 251 break; 252 253 if((rsp->offset == rsp->media_sz) && (bytes_left != 0)) { 254 printf("\nInsert next media and hit any key..."); 255 cngetc(); 256 printf("\n"); 257 rsp->offset = 0; 258 } 259 } 260 printf("\n"); 261 return(error); 262 } 263 264 #ifdef support_compression 265 /* 266 * Functions supporting uncompression: 267 */ 268 /* 269 * Copy from the uncompression buffer to the ramdisk 270 */ 271 static int 272 cpy_uncompressed(buf, nbyte, rsp) 273 caddr_t buf; 274 struct read_info *rsp; 275 int nbyte; 276 { 277 if((rsp->bufp + nbyte) >= rsp->ebufp) 278 return(0); 279 bcopy(buf, rsp->bufp, nbyte); 280 rsp->bufp += nbyte; 281 return(0); 282 } 283 284 /* 285 * Read a maximum of 'nbyte' bytes into 'buf'. 286 */ 287 static int 288 md_compressed(buf, nbyte, rsp) 289 caddr_t buf; 290 struct read_info *rsp; 291 int nbyte; 292 { 293 static int dotc = 0; 294 struct buf *bp; 295 int nread = 0; 296 int s; 297 int done, error; 298 299 300 error = 0; 301 bp = rsp->bp; 302 nbyte &= ~(DEV_BSIZE - 1); 303 304 while(nbyte > 0) { 305 s = splbio(); 306 bp->b_flags = B_BUSY | B_PHYS | B_READ; 307 splx(s); 308 bp->b_blkno = btodb(rsp->offset); 309 bp->b_bcount = min(rsp->chunk, nbyte); 310 bp->b_data = buf; 311 312 /* Initiate read */ 313 (*rsp->strat)(bp); 314 315 /* Wait for results */ 316 s = splbio(); 317 while ((bp->b_flags & B_DONE) == 0) 318 tsleep((caddr_t) bp, PRIBIO + 1, "ramd_norm_read", 0); 319 if (bp->b_flags & B_ERROR) 320 error = (bp->b_error ? bp->b_error : EIO); 321 splx(s); 322 323 /* Dot counter */ 324 printf("."); 325 if(!(++dotc % 40)) 326 printf("\n"); 327 328 done = bp->b_bcount - bp->b_resid; 329 nbyte -= done; 330 nread += done; 331 rsp->offset += done; 332 333 if(error || !done) 334 break; 335 336 if((rsp->offset == rsp->media_sz) && (nbyte != 0)) { 337 if(rsp->offset == rsp->media_sz) { 338 printf("\nInsert next media and hit any key..."); 339 if(cngetc() != '\n') 340 printf("\n"); 341 rsp->offset = 0; 342 } 343 } 344 s = splbio(); 345 splx(s); 346 return(nread); 347 } 348 #endif /* support_compression */ 349
Indexes created Wed Sep 24 05:09:52 GMT 2025