sys/geom/geom_redboot.c

   1 /*-
   2  * Copyright (c) 2009 Sam Leffler, Errno Consulting
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer,
  10  *    without modification.
  11  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  12  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
  13  *    redistribution must be conditioned upon including a substantially
  14  *    similar Disclaimer requirement for further binary redistribution.
  15  *
  16  * NO WARRANTY
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
  20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
  22  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  27  * THE POSSIBILITY OF SUCH DAMAGES.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #include <sys/errno.h>
  35 #include <sys/endian.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/malloc.h>
  40 #include <sys/bio.h>
  41 #include <sys/lock.h>
  42 #include <sys/mutex.h>
  43
  44 #include <sys/sbuf.h>
  45 #include <geom/geom.h>
  46 #include <geom/geom_slice.h>
  47
  48 #define REDBOOT_CLASS_NAME "REDBOOT"
  49
  50 struct fis_image_desc {
  51         uint8_t         name[16];       /* null-terminated name */
  52         uint32_t        offset;         /* offset in flash */
  53         uint32_t        addr;           /* address in memory */
  54         uint32_t        size;           /* image size in bytes */
  55         uint32_t        entry;          /* offset in image for entry point */
  56         uint32_t        dsize;          /* data size in bytes */
  57         uint8_t         pad[256-(16+7*sizeof(uint32_t)+sizeof(void*))];
  58         struct fis_image_desc *next;    /* linked list (in memory) */
  59         uint32_t        dsum;           /* descriptor checksum */
  60         uint32_t        fsum;           /* checksum over image data */
  61 };
  62
  63 #define FISDIR_NAME     "FIS directory"
  64 #define REDBCFG_NAME    "RedBoot config"
  65 #define REDBOOT_NAME    "RedBoot"
  66
  67 #define REDBOOT_MAXSLICE        64
  68 #define REDBOOT_MAXOFF \
  69         (REDBOOT_MAXSLICE*sizeof(struct fis_image_desc))
  70
  71 struct g_redboot_softc {
  72         uint32_t        entry[REDBOOT_MAXSLICE];
  73         uint32_t        dsize[REDBOOT_MAXSLICE];
  74         uint8_t         readonly[REDBOOT_MAXSLICE];
  75         g_access_t      *parent_access;
  76 };
  77
  78 static void
  79 g_redboot_print(int i, struct fis_image_desc *fd)
  80 {
  81
  82         printf("[%2d] \"%-15.15s\" %08x:%08x", i, fd->name,
  83             fd->offset, fd->size);
  84         printf(" addr %08x entry %08x\n", fd->addr, fd->entry);
  85         printf("     dsize 0x%x dsum 0x%x fsum 0x%x\n", fd->dsize,
  86             fd->dsum, fd->fsum);
  87 }
  88
  89 static int
  90 g_redboot_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
  91 {
  92         return (ENOIOCTL);
  93 }
  94
  95 static int
  96 g_redboot_access(struct g_provider *pp, int dread, int dwrite, int dexcl)
  97 {
  98         struct g_geom *gp = pp->geom;
  99         struct g_slicer *gsp = gp->softc;
 100         struct g_redboot_softc *sc = gsp->softc;
 101
 102         if (dwrite > 0 && sc->readonly[pp->index])
 103                 return (EPERM);
 104         return (sc->parent_access(pp, dread, dwrite, dexcl));
 105 }
 106
 107 static int
 108 g_redboot_start(struct bio *bp)
 109 {
 110         struct g_provider *pp;
 111         struct g_geom *gp;
 112         struct g_redboot_softc *sc;
 113         struct g_slicer *gsp;
 114         int idx;
 115
 116         pp = bp->bio_to;
 117         idx = pp->index;
 118         gp = pp->geom;
 119         gsp = gp->softc;
 120         sc = gsp->softc;
 121         if (bp->bio_cmd == BIO_GETATTR) {
 122                 if (g_handleattr_int(bp, REDBOOT_CLASS_NAME "::entry",
 123                     sc->entry[idx]))
 124                         return (1);
 125                 if (g_handleattr_int(bp, REDBOOT_CLASS_NAME "::dsize",
 126                     sc->dsize[idx]))
 127                         return (1);
 128         }
 129
 130         return (0);
 131 }
 132
 133 static void
 134 g_redboot_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
 135         struct g_consumer *cp __unused, struct g_provider *pp)
 136 {
 137         struct g_redboot_softc *sc;
 138         struct g_slicer *gsp;
 139
 140         gsp = gp->softc;
 141         sc = gsp->softc;
 142         g_slice_dumpconf(sb, indent, gp, cp, pp);
 143         if (pp != NULL) {
 144                 if (indent == NULL) {
 145                         sbuf_printf(sb, " entry %d", sc->entry[pp->index]);
 146                         sbuf_printf(sb, " dsize %d", sc->dsize[pp->index]);
 147                 } else {
 148                         sbuf_printf(sb, "%s<entry>%d</entry>\n", indent,
 149                             sc->entry[pp->index]);
 150                         sbuf_printf(sb, "%s<dsize>%d</dsize>\n", indent,
 151                             sc->dsize[pp->index]);
 152                 }
 153         }
 154 }
 155
 156 #include <sys/ctype.h>
 157
 158 static int
 159 nameok(const char name[16])
 160 {
 161         int i;
 162
 163         /* descriptor names are null-terminated printable ascii */
 164         for (i = 0; i < 15; i++)
 165                 if (!isprint(name[i]))
 166                         break;
 167         return (name[i] == '\0');
 168 }
 169
 170 static struct fis_image_desc *
 171 parse_fis_directory(u_char *buf, size_t bufsize, off_t offset, uint32_t offmask)
 172 {
 173 #define match(a,b)      (bcmp(a, b, sizeof(b)-1) == 0)
 174         struct fis_image_desc *fd, *efd;
 175         struct fis_image_desc *fisdir, *redbcfg;
 176         struct fis_image_desc *head, **tail;
 177         int i;
 178
 179         fd = (struct fis_image_desc *)buf;
 180         efd = fd + (bufsize / sizeof(struct fis_image_desc));
 181 #if 0
 182         /*
 183          * Find the start of the FIS table.
 184          */
 185         while (fd < efd && fd->name[0] != 0xff)
 186                 fd++;
 187         if (fd == efd)
 188                 return (NULL);
 189         if (bootverbose)
 190                 printf("RedBoot FIS table starts at 0x%jx\n",
 191                     offset + fd - (struct fis_image_desc *) buf);
 192 #endif
 193         /*
 194          * Scan forward collecting entries in a list.
 195          */
 196         fisdir = redbcfg = NULL;
 197         *(tail = &head) = NULL;
 198         for (i = 0; fd < efd; i++, fd++) {
 199                 if (fd->name[0] == 0xff)
 200                         continue;
 201                 if (match(fd->name, FISDIR_NAME))
 202                         fisdir = fd;
 203                 else if (match(fd->name, REDBCFG_NAME))
 204                         redbcfg = fd;
 205                 if (nameok(fd->name)) {
 206                         /*
 207                          * NB: flash address includes platform mapping;
 208                          *     strip it so we have only a flash offset.
 209                          */
 210                         fd->offset &= offmask;
 211                         if (bootverbose)
 212                                 g_redboot_print(i, fd);
 213                         *tail = fd;
 214                         *(tail = &fd->next) = NULL;
 215                 }
 216         }
 217         if (fisdir == NULL) {
 218                 if (bootverbose)
 219                         printf("No RedBoot FIS table located at %lu\n",
 220                             (long) offset);
 221                 return (NULL);
 222         }
 223         if (redbcfg != NULL &&
 224             fisdir->offset + fisdir->size == redbcfg->offset) {
 225                 /*
 226                  * Merged FIS/RedBoot config directory.
 227                  */
 228                 if (bootverbose)
 229                         printf("FIS/RedBoot merged at 0x%jx (not yet)\n",
 230                             offset + fisdir->offset);
 231                 /* XXX */
 232         }
 233         return head;
 234 #undef match
 235 }
 236
 237 static struct g_geom *
 238 g_redboot_taste(struct g_class *mp, struct g_provider *pp, int insist)
 239 {
 240         struct g_geom *gp;
 241         struct g_consumer *cp;
 242         struct g_redboot_softc *sc;
 243         int error, sectorsize, i;
 244         struct fis_image_desc *fd, *head;
 245         uint32_t offmask;
 246         u_int blksize;          /* NB: flash block size stored as stripesize */
 247         u_char *buf;
 248         off_t offset;
 249
 250         g_trace(G_T_TOPOLOGY, "redboot_taste(%s,%s)", mp->name, pp->name);
 251         g_topology_assert();
 252         if (!strcmp(pp->geom->class->name, REDBOOT_CLASS_NAME))
 253                 return (NULL);
 254         /* XXX only taste flash providers */
 255         if (strncmp(pp->name, "cfi", 3) &&
 256             strncmp(pp->name, "flash/spi", 9))
 257                 return (NULL);
 258         gp = g_slice_new(mp, REDBOOT_MAXSLICE, pp, &cp, &sc, sizeof(*sc),
 259             g_redboot_start);
 260         if (gp == NULL)
 261                 return (NULL);
 262         /* interpose our access method */
 263         sc->parent_access = gp->access;
 264         gp->access = g_redboot_access;
 265
 266         sectorsize = cp->provider->sectorsize;
 267         blksize = cp->provider->stripesize;
 268         if (powerof2(cp->provider->mediasize))
 269                 offmask = cp->provider->mediasize-1;
 270         else
 271                 offmask = 0xffffffff;           /* XXX */
 272         if (bootverbose)
 273                 printf("%s: mediasize %ld secsize %d blksize %d offmask 0x%x\n",
 274                     __func__, (long) cp->provider->mediasize, sectorsize,
 275                     blksize, offmask);
 276         if (sectorsize < sizeof(struct fis_image_desc) ||
 277             (sectorsize % sizeof(struct fis_image_desc)))
 278                 return (NULL);
 279         g_topology_unlock();
 280         head = NULL;
 281         offset = cp->provider->mediasize - blksize;
 282 again:
 283         buf = g_read_data(cp, offset, blksize, NULL);
 284         if (buf != NULL)
 285                 head = parse_fis_directory(buf, blksize, offset, offmask);
 286         if (head == NULL && offset != 0) {
 287                 if (buf != NULL)
 288                         g_free(buf);
 289                 offset = 0;                     /* check the front */
 290                 goto again;
 291         }
 292         g_topology_lock();
 293         if (head == NULL) {
 294                 if (buf != NULL)
 295                         g_free(buf);
 296                 return NULL;
 297         }
 298         /*
 299          * Craft a slice for each entry.
 300          */
 301         for (fd = head, i = 0; fd != NULL; fd = fd->next) {
 302                 if (fd->name[0] == '\0')
 303                         continue;
 304                 error = g_slice_config(gp, i, G_SLICE_CONFIG_SET,
 305                     fd->offset, fd->size, sectorsize, "redboot/%s", fd->name);
 306                 if (error)
 307                         printf("%s: g_slice_config returns %d for \"%s\"\n",
 308                             __func__, error, fd->name);
 309                 sc->entry[i] = fd->entry;
 310                 sc->dsize[i] = fd->dsize;
 311                 /* disallow writing hard-to-recover entries */
 312                 sc->readonly[i] = (strcmp(fd->name, FISDIR_NAME) == 0) ||
 313                                   (strcmp(fd->name, REDBOOT_NAME) == 0);
 314                 i++;
 315         }
 316         g_free(buf);
 317         g_access(cp, -1, 0, 0);
 318         if (LIST_EMPTY(&gp->provider)) {
 319                 g_slice_spoiled(cp);
 320                 return (NULL);
 321         }
 322         return (gp);
 323 }
 324
 325 static void
 326 g_redboot_config(struct gctl_req *req, struct g_class *mp, const char *verb)
 327 {
 328         struct g_geom *gp;
 329
 330         g_topology_assert();
 331         gp = gctl_get_geom(req, mp, "geom");
 332         if (gp == NULL)
 333                 return;
 334         gctl_error(req, "Unknown verb");
 335 }
 336
 337 static struct g_class g_redboot_class   = {
 338         .name           = REDBOOT_CLASS_NAME,
 339         .version        = G_VERSION,
 340         .taste          = g_redboot_taste,
 341         .dumpconf       = g_redboot_dumpconf,
 342         .ctlreq         = g_redboot_config,
 343         .ioctl          = g_redboot_ioctl,
 344 };
 345 DECLARE_GEOM_CLASS(g_redboot_class, g_redboot);