md_root.c revision 1.13
1 /* $NetBSD: md_root.c,v 1.13 1997/07/30 15:45:33 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 2 /* 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 1105920, /* 1Mb in 2160 sectors */ 78 RAMD_LOAD, /* auto-load this device */ 79 MAKEDISKDEV(2, 0, 3), /* XXX: This is crap! (1.44Mb flop) */ 80 } 81 }; 82 83 struct read_info { 84 struct buf *bp; /* buffer for strategy function */ 85 long nbytes; /* total number of bytes to read */ 86 long offset; /* offset in input medium */ 87 caddr_t bufp; /* current output buffer */ 88 caddr_t ebufp; /* absolute maximum for bufp */ 89 int chunk; /* chunk size on input medium */ 90 int media_sz; /* size of input medium */ 91 void (*strat)(struct buf *); /* strategy function for read */ 92 }; 93 94 95 static int loaddisk __P((struct md_conf *, dev_t ld_dev, struct proc *)); 96 static int ramd_norm_read __P((struct read_info *)); 97 98 #ifdef support_compression 99 static int cpy_uncompressed __P((caddr_t, int, struct read_info *)); 100 static int md_compressed __P((caddr_t, int, struct read_info *)); 101 #endif 102 103 /* 104 * This is called during autoconfig. 105 */ 106 void 107 md_attach_hook(unit, md) 108 int unit; 109 struct md_conf *md; 110 { 111 if (atari_realconfig && (unit < RAMD_NDEV) && rd_info[unit].ramd_flag) { 112 printf ("md%d: %sauto-load on open. Size %ld bytes.\n", unit, 113 rd_info[unit].ramd_flag & RAMD_LCOMP ? "decompress/" : "", 114 rd_info[unit].ramd_size); 115 md->md_type = MD_UNCONFIGURED; /* Paranoia... */ 116 } 117 } 118 119 void 120 md_open_hook(unit, md) 121 int unit; 122 struct md_conf *md; 123 { 124 struct ramd_info *ri; 125 126 if(unit >= RAMD_NDEV) 127 return; 128 129 ri = &rd_info[unit]; 130 if (md->md_type != MD_UNCONFIGURED) 131 return; /* Only configure once */ 132 md->md_addr = malloc(ri->ramd_size, M_DEVBUF, M_WAITOK); 133 md->md_size = ri->ramd_size; 134 if(md->md_addr == NULL) 135 return; 136 if(ri->ramd_flag & RAMD_LOAD) { 137 if (loaddisk(md, ri->ramd_dev, curproc)) { 138 free(md->md_addr, M_DEVBUF); 139 md->md_addr = NULL; 140 return; 141 } 142 } 143 md->md_type = MD_KMEM_ALLOCATED; 144 } 145 146 static int 147 loaddisk(md, ld_dev, proc) 148 struct md_conf *md; 149 dev_t ld_dev; 150 struct proc *proc; 151 { 152 struct buf buf; 153 int error; 154 struct bdevsw *bdp = &bdevsw[major(ld_dev)]; 155 struct disklabel dl; 156 struct read_info rs; 157 158 /* 159 * Initialize our buffer header: 160 */ 161 buf.b_actf = NULL; 162 buf.b_rcred = buf.b_wcred = proc->p_ucred; 163 buf.b_vnbufs.le_next = NOLIST; 164 buf.b_flags = B_BUSY; 165 buf.b_dev = ld_dev; 166 buf.b_error = 0; 167 buf.b_proc = proc; 168 169 /* 170 * Setup read_info: 171 */ 172 rs.bp = &buf; 173 rs.nbytes = md->md_size; 174 rs.offset = 0; 175 rs.bufp = md->md_addr; 176 rs.ebufp = md->md_addr + md->md_size; 177 rs.chunk = RAMD_CHUNK; 178 rs.media_sz = md->md_size; 179 rs.strat = bdp->d_strategy; 180 181 /* 182 * Open device and try to get some statistics. 183 */ 184 if((error = bdp->d_open(ld_dev, FREAD | FNONBLOCK, 0, proc)) != 0) 185 return(error); 186 if(bdp->d_ioctl(ld_dev, DIOCGDINFO, (caddr_t)&dl, FREAD, proc) == 0) { 187 /* Read on a cylinder basis */ 188 rs.chunk = dl.d_secsize * dl.d_secpercyl; 189 rs.media_sz = dl.d_secperunit * dl.d_secsize; 190 } 191 192 #ifdef support_compression 193 if(ri->ramd_flag & RAMD_LCOMP) 194 error = decompress(cpy_uncompressed, md_compressed, &rs); 195 else 196 #endif /* support_compression */ 197 error = ramd_norm_read(&rs); 198 199 bdp->d_close(ld_dev,FREAD | FNONBLOCK, 0, proc); 200 return(error); 201 } 202 203 static int 204 ramd_norm_read(rsp) 205 struct read_info *rsp; 206 { 207 long bytes_left; 208 int done, error; 209 struct buf *bp; 210 int s; 211 int dotc = 0; 212 213 bytes_left = rsp->nbytes; 214 bp = rsp->bp; 215 error = 0; 216 217 while(bytes_left > 0) { 218 s = splbio(); 219 bp->b_flags = B_BUSY | B_PHYS | B_READ; 220 splx(s); 221 bp->b_blkno = btodb(rsp->offset); 222 bp->b_bcount = rsp->chunk; 223 bp->b_data = rsp->bufp; 224 225 /* Initiate read */ 226 (*rsp->strat)(bp); 227 228 /* Wait for results */ 229 s = splbio(); 230 while ((bp->b_flags & B_DONE) == 0) 231 tsleep((caddr_t) bp, PRIBIO + 1, "ramd_norm_read", 0); 232 if (bp->b_flags & B_ERROR) 233 error = (bp->b_error ? bp->b_error : EIO); 234 splx(s); 235 236 /* Dot counter */ 237 printf("."); 238 if(!(++dotc % 40)) 239 printf("\n"); 240 241 done = bp->b_bcount - bp->b_resid; 242 bytes_left -= done; 243 rsp->offset += done; 244 rsp->bufp += done; 245 246 if(error || !done) 247 break; 248 249 if((rsp->offset == rsp->media_sz) && (bytes_left != 0)) { 250 printf("\nInsert next media and hit any key..."); 251 cngetc(); 252 printf("\n"); 253 rsp->offset = 0; 254 } 255 } 256 printf("\n"); 257 return(error); 258 } 259 260 #ifdef support_compression 261 /* 262 * Functions supporting uncompression: 263 */ 264 /* 265 * Copy from the uncompression buffer to the ramdisk 266 */ 267 static int 268 cpy_uncompressed(buf, nbyte, rsp) 269 caddr_t buf; 270 struct read_info *rsp; 271 int nbyte; 272 { 273 if((rsp->bufp + nbyte) >= rsp->ebufp) 274 return(0); 275 bcopy(buf, rsp->bufp, nbyte); 276 rsp->bufp += nbyte; 277 return(0); 278 } 279 280 /* 281 * Read a maximum of 'nbyte' bytes into 'buf'. 282 */ 283 static int 284 md_compressed(buf, nbyte, rsp) 285 caddr_t buf; 286 struct read_info *rsp; 287 int nbyte; 288 { 289 static int dotc = 0; 290 struct buf *bp; 291 int nread = 0; 292 int s; 293 int done, error; 294 295 296 error = 0; 297 bp = rsp->bp; 298 nbyte &= ~(DEV_BSIZE - 1); 299 300 while(nbyte > 0) { 301 s = splbio(); 302 bp->b_flags = B_BUSY | B_PHYS | B_READ; 303 splx(s); 304 bp->b_blkno = btodb(rsp->offset); 305 bp->b_bcount = min(rsp->chunk, nbyte); 306 bp->b_data = buf; 307 308 /* Initiate read */ 309 (*rsp->strat)(bp); 310 311 /* Wait for results */ 312 s = splbio(); 313 while ((bp->b_flags & B_DONE) == 0) 314 tsleep((caddr_t) bp, PRIBIO + 1, "ramd_norm_read", 0); 315 if (bp->b_flags & B_ERROR) 316 error = (bp->b_error ? bp->b_error : EIO); 317 splx(s); 318 319 /* Dot counter */ 320 printf("."); 321 if(!(++dotc % 40)) 322 printf("\n"); 323 324 done = bp->b_bcount - bp->b_resid; 325 nbyte -= done; 326 nread += done; 327 rsp->offset += done; 328 329 if(error || !done) 330 break; 331 332 if((rsp->offset == rsp->media_sz) && (nbyte != 0)) { 333 if(rsp->offset == rsp->media_sz) { 334 printf("\nInsert next media and hit any key..."); 335 if(cngetc() != '\n') 336 printf("\n"); 337 rsp->offset = 0; 338 } 339 } 340 s = splbio(); 341 splx(s); 342 return(nread); 343 } 344 #endif /* support_compression */ 345
Indexes created Wed Sep 24 05:09:52 GMT 2025