packages/sun-parts.c

   1 /*
   2  *   Sun (Sparc32/64) partition support
   3  *
   4  *   Copyright (C) 2004 Stefan Reinauer
   5  *
   6  *   This code is based (and copied in many places) from
   7  *   mac partition support by Samuel Rydh (samuel@ibrium.se)
   8  *
   9  *   This program is free software; you can redistribute it and/or
  10  *   modify it under the terms of the GNU General Public License
  11  *   version 2
  12  *
  13  */
  14
  15 #include "config.h"
  16 #include "libopenbios/bindings.h"
  17 #include "libopenbios/load.h"
  18 #include "libc/byteorder.h"
  19 #include "libc/vsprintf.h"
  20 #include "packages.h"
  21
  22 //#define DEBUG_SUN_PARTS
  23
  24 #ifdef DEBUG_SUN_PARTS
  25 #define DPRINTF(fmt, args...)                   \
  26     do { printk(fmt , ##args); } while (0)
  27 #else
  28 #define DPRINTF(fmt, args...)
  29 #endif
  30
  31 typedef struct {
  32         xt_t            seek_xt, read_xt;
  33         ucell           offs_hi, offs_lo;
  34         ucell           size_hi, size_lo;
  35         int             type;
  36         phandle_t       filesystem_ph;
  37 } sunparts_info_t;
  38
  39 DECLARE_NODE( sunparts, INSTALL_OPEN, sizeof(sunparts_info_t), "+/packages/sun-parts" );
  40
  41 #define SEEK( pos )             ({ DPUSH(pos); call_parent(di->seek_xt); POP(); })
  42 #define READ( buf, size )       ({ PUSH((ucell)buf); PUSH(size); call_parent(di->read_xt); POP(); })
  43
  44 /* Layout of SUN partition table */
  45 struct sun_disklabel {
  46     uint8_t info[128];   /* Informative text string */
  47     uint8_t spare0[14];
  48     struct sun_info {
  49         uint16_t id;
  50         uint16_t flags;
  51     } infos[8];
  52     uint8_t spare[246];  /* Boot information etc. */
  53     uint16_t rspeed;     /* Disk rotational speed */
  54     uint16_t pcylcount;  /* Physical cylinder count */
  55     uint16_t sparecyl;   /* extra sects per cylinder */
  56     uint8_t spare2[4];   /* More magic... */
  57     uint16_t ilfact;     /* Interleave factor */
  58     uint16_t ncyl;       /* Data cylinder count */
  59     uint16_t nacyl;      /* Alt. cylinder count */
  60     uint16_t ntrks;      /* Tracks per cylinder */
  61     uint16_t nsect;      /* Sectors per track */
  62     uint8_t spare3[4];   /* Even more magic... */
  63     struct sun_partition {
  64         uint32_t start_cylinder;
  65         uint32_t num_sectors;
  66     } partitions[8];
  67     uint16_t magic;      /* Magic number */
  68     uint16_t csum;       /* Label xor'd checksum */
  69 };
  70
  71 /* two helper functions */
  72
  73 static inline int
  74 has_sun_part_magic(unsigned char *sect)
  75 {
  76     struct sun_disklabel *p = (struct sun_disklabel *)sect;
  77     uint16_t csum, *ush, tmp16;
  78
  79     if (__be16_to_cpu(p->magic) != 0xDABE)
  80         return 0;
  81
  82     csum = 0;
  83     for (ush = (uint16_t *)p; ush < (uint16_t *)(p + 1); ush++) {
  84         tmp16 = __be16_to_cpu(*ush);
  85         csum ^= tmp16;
  86     }
  87     return csum == 0;
  88 }
  89
  90 /* ( open -- flag ) */
  91 static void
  92 sunparts_open( sunparts_info_t *di )
  93 {
  94         char *str = my_args_copy();
  95         char *argstr = NULL;
  96         char *parstr = NULL;
  97         int parnum = -1;
  98         unsigned char buf[512];
  99         struct sun_disklabel *p;
 100         unsigned int i, bs;
 101         ducell offs, size;
 102         phandle_t ph;
 103
 104         DPRINTF("sunparts_open '%s'\n", str );
 105
 106         /*
 107                 Arguments that we accept:
 108                 id: [0-7] | [a-h]
 109                 [(id)][,][filespec]
 110         */
 111
 112         if( str ) {
 113                 if ( !strlen(str) )
 114                         parnum = -1;
 115                 else {
 116                         /* Detect the boot parameters */
 117                         char *ptr;
 118                         ptr = str;
 119
 120                         /* <id>,<file> */
 121                         if (((*ptr >= '0' && *ptr <= '9') || (*ptr >= 'a' && *ptr <= 'a' + 8)) && *(ptr + 1) == ',') {
 122                                 parstr = ptr;
 123                                 *(ptr + 1) = '\0';
 124                                 argstr = ptr + 2;
 125                         }
 126
 127                         /* <id> */
 128                         else if (((*ptr >= '0' && *ptr <= '9') || (*ptr >= 'a' && *ptr <= 'a' + 8)) && *(ptr + 1) == '\0') {
 129                                 parstr = ptr;
 130                         }
 131
 132                         /* ,<file> */
 133                         else if (*ptr == ',') {
 134                                 argstr = ptr + 1;
 135                         }
 136
 137                         /* <file> */
 138                         else {
 139                                 argstr = str;
 140                         }
 141
 142                         /* Convert the id to a partition number */
 143                         if (parstr && strlen(parstr)) {
 144                                 if (parstr[0] >= 'a' && parstr[0] < ('a' + 8))
 145                                         parnum = parstr[0] - 'a';
 146                                 else
 147                                         parnum = atol(parstr);
 148                         }
 149                 }
 150         }
 151
 152         DPRINTF("parstr: %s  argstr: %s  parnum: %d\n", parstr, argstr, parnum);
 153
 154         di->filesystem_ph = 0;
 155         di->read_xt = find_parent_method("read");
 156         di->seek_xt = find_parent_method("seek");
 157
 158         SEEK( 0 );
 159         if (READ(buf, 512) != 512) {
 160                 free(str);
 161                 RET(0);
 162         }
 163
 164         /* Check Magic */
 165         if (!has_sun_part_magic(buf)) {
 166                 DPRINTF("Sun partition magic not found.\n");
 167                 free(str);
 168                 RET(0);
 169         }
 170
 171         bs = 512;
 172         /* get partition data */
 173         p = (struct sun_disklabel *)buf;
 174
 175         for (i = 0; i < 8; i++) {
 176             DPRINTF("%c: %d + %d, id %x, flags %x\n", 'a' + i,
 177                     __be32_to_cpu(p->partitions[i].start_cylinder),
 178                     __be32_to_cpu(p->partitions[i].num_sectors),
 179                     __be16_to_cpu(p->infos[i].id),
 180                     __be16_to_cpu(p->infos[i].flags));
 181         }
 182
 183         if (parnum < 0)
 184             parnum = 0;
 185
 186         DPRINTF("Selected partition %d\n", parnum);
 187
 188         offs = (long long)__be32_to_cpu(p->partitions[parnum].start_cylinder) *
 189             __be16_to_cpu(p->ntrks) * __be16_to_cpu(p->nsect) * bs;
 190
 191         di->offs_hi = offs >> BITS;
 192         di->offs_lo = offs & (ucell) -1;
 193         size = (long long)__be32_to_cpu(p->partitions[parnum].num_sectors) * bs;
 194         if (size == 0) {
 195                 DPRINTF("Partition size is 0, exiting\n");
 196                 free(str);
 197                 RET(0);
 198         }
 199         di->size_hi = size >> BITS;
 200         di->size_lo = size & (ucell) -1;
 201         di->type = __be16_to_cpu(p->infos[parnum].id);
 202
 203         DPRINTF("Found Sun partition, offs %lld size %lld\n",
 204                 (long long)offs, (long long)size);
 205
 206         /* Probe for filesystem at current offset */
 207         DPRINTF("sun-parts: about to probe for fs\n");
 208         DPUSH( offs );
 209         PUSH_ih( my_parent() );
 210         parword("find-filesystem");
 211         DPRINTF("sun-parts: done fs probe\n");
 212
 213         ph = POP_ph();
 214         if( ph ) {
 215                 DPRINTF("sun-parts: filesystem found with ph " FMT_ucellx " and args %s\n", ph, argstr);
 216                 di->filesystem_ph = ph;
 217
 218                 /* If we have been asked to open a particular file, interpose the filesystem package with
 219                    the passed filename as an argument */
 220                 if (argstr && strlen(argstr)) {
 221                         push_str( argstr );
 222                         PUSH_ph( ph );
 223                         fword("interpose");
 224                 }
 225         } else {
 226                 DPRINTF("sun-parts: no filesystem found; bypassing misc-files interpose\n");
 227
 228                 /* Solaris Fcode boot blocks assume that the disk-label package will always
 229                    automatically interpose the "ufs-file-system" package if it exists! We
 230                    need to mimic this behaviour in order for the boot to work. */
 231                 push_str("ufs-file-system");
 232                 feval("find-package");
 233                 ph = POP_ph();
 234
 235                 if (argstr && ph) {
 236                         ph = POP_ph();
 237                         push_str(argstr);
 238                         PUSH_ph(ph);
 239                         fword("interpose");
 240                 }
 241         }
 242
 243         free( str );
 244         RET( -1 );
 245 }
 246
 247 /* ( block0 -- flag? ) */
 248 static void
 249 sunparts_probe( __attribute__((unused))sunparts_info_t *dummy )
 250 {
 251         unsigned char *buf = (unsigned char *)POP();
 252
 253         DPRINTF("probing for Sun partitions\n");
 254
 255         RET ( has_sun_part_magic(buf) );
 256 }
 257
 258 /* ( -- type offset.d size.d ) */
 259 static void
 260 sunparts_get_info( sunparts_info_t *di )
 261 {
 262         DPRINTF("Sun get_info\n");
 263         PUSH( di->type );
 264         PUSH( di->offs_lo );
 265         PUSH( di->offs_hi );
 266         PUSH( di->size_lo );
 267         PUSH( di->size_hi );
 268 }
 269
 270 static void
 271 sunparts_block_size( __attribute__((unused))sunparts_info_t *di )
 272 {
 273         PUSH(512);
 274 }
 275
 276 static void
 277 sunparts_initialize( __attribute__((unused))sunparts_info_t *di )
 278 {
 279         fword("register-partition-package");
 280 }
 281
 282 /* ( pos.d -- status ) */
 283 static void
 284 sunparts_seek(sunparts_info_t *di )
 285 {
 286         long long pos = DPOP();
 287         long long offs, size;;
 288
 289         DPRINTF("sunparts_seek %llx:\n", pos);
 290
 291         /* Seek is invalid if we reach the end of the device */
 292         size = ((ducell)di->size_hi << BITS) | di->size_lo;
 293         if (pos > size)
 294                 RET( -1 );
 295
 296         /* Calculate the seek offset for the parent */
 297         offs = ((ducell)di->offs_hi << BITS) | di->offs_lo;
 298         offs += pos;
 299         DPUSH(offs);
 300
 301         DPRINTF("sunparts_seek parent offset %llx:\n", offs);
 302
 303         call_package(di->seek_xt, my_parent());
 304 }
 305
 306 /* ( buf len -- actlen ) */
 307 static void
 308 sunparts_read(sunparts_info_t *di )
 309 {
 310         DPRINTF("sunparts_read\n");
 311
 312         /* Pass the read back up to the parent */
 313         call_package(di->read_xt, my_parent());
 314 }
 315
 316 /* ( addr -- size ) */
 317 static void
 318 sunparts_load( __attribute__((unused))sunparts_info_t *di )
 319 {
 320         /* Invoke the loader */
 321         load(my_self());
 322 }
 323
 324 /* ( pathstr len -- ) */
 325 static void
 326 sunparts_dir( sunparts_info_t *di )
 327 {
 328         if ( di->filesystem_ph) {
 329                 PUSH( my_self() );
 330                 push_str("dir");
 331                 PUSH( di->filesystem_ph );
 332                 fword("find-method");
 333                 POP();
 334                 fword("execute");
 335         } else {
 336                 forth_printf("sun-parts: Unable to determine filesystem\n");
 337                 POP();
 338                 POP();
 339         }
 340 }
 341
 342 NODE_METHODS( sunparts ) = {
 343         { "probe",      sunparts_probe          },
 344         { "open",       sunparts_open           },
 345         { "get-info",   sunparts_get_info       },
 346         { "block-size", sunparts_block_size     },
 347         { "seek",       sunparts_seek           },
 348         { "read",       sunparts_read           },
 349         { "load",       sunparts_load           },
 350         { "dir",        sunparts_dir            },
 351         { NULL,         sunparts_initialize     },
 352 };
 353
 354 void
 355 sunparts_init( void )
 356 {
 357         REGISTER_NODE( sunparts );
 358 }