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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);