File: | arch/amd64/amd64/dkcsum.c |
Warning: | line 125, column 4 Value stored to 'error' is never read |
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1 | /* $OpenBSD: dkcsum.c,v 1.21 2014/09/14 14:17:23 jsg Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 1997 Niklas Hallqvist. All rights reserved. |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
9 | * 1. Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * 2. Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
14 | * |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
25 | */ |
26 | |
27 | /* |
28 | * A checksumming pseudo device used to get unique labels of each disk |
29 | * that needs to be matched to BIOS disks. |
30 | */ |
31 | |
32 | #include <sys/param.h> |
33 | #include <sys/buf.h> |
34 | #include <sys/conf.h> |
35 | #include <sys/device.h> |
36 | #include <sys/disklabel.h> |
37 | #include <sys/fcntl.h> |
38 | #include <sys/reboot.h> |
39 | #include <sys/stat.h> |
40 | #include <sys/systm.h> |
41 | |
42 | #include <machine/biosvar.h> |
43 | |
44 | #include <lib/libz/zlib.h> |
45 | |
46 | dev_t dev_rawpart(struct device *); /* XXX */ |
47 | |
48 | extern u_int32_t bios_cksumlen; |
49 | extern bios_diskinfo_t *bios_diskinfo; |
50 | extern dev_t bootdev; |
51 | |
52 | void |
53 | dkcsumattach(void) |
54 | { |
55 | struct device *dv; |
56 | struct buf *bp; |
57 | struct bdevsw *bdsw; |
58 | dev_t dev, pribootdev, altbootdev; |
59 | int error, picked; |
60 | u_int32_t csum; |
61 | bios_diskinfo_t *bdi, *hit; |
62 | |
63 | /* do nothing if no diskinfo passed from /boot, or a bad length */ |
64 | if (bios_diskinfo == NULL((void *)0) || bios_cksumlen * DEV_BSIZE(1 << 9) > MAXBSIZE(64 * 1024)) |
65 | return; |
66 | |
67 | /* Do nothing if bootdev is a CD drive. */ |
68 | if (B_TYPE(bootdev)(((bootdev) >> 0) & 0xff) == 6) |
69 | return; |
70 | |
71 | #ifdef DEBUG |
72 | printf("dkcsum: bootdev=%#x\n", bootdev); |
73 | for (bdi = bios_diskinfo; bdi->bios_number != -1; bdi++) { |
74 | if (bdi->bios_number & 0x80) { |
75 | printf("dkcsum: BIOS drive %#x bsd_dev=%#x " |
76 | "checksum=%#x\n", bdi->bios_number, bdi->bsd_dev, |
77 | bdi->checksum); |
78 | } |
79 | } |
80 | #endif |
81 | pribootdev = altbootdev = 0; |
82 | |
83 | /* |
84 | * XXX What if DEV_BSIZE is changed to something else than the BIOS |
85 | * blocksize? Today, /boot doesn't cover that case so neither need |
86 | * I care here. |
87 | */ |
88 | bp = geteblk(bios_cksumlen * DEV_BSIZE(1 << 9)); /* XXX error check? */ |
89 | |
90 | TAILQ_FOREACH(dv, &alldevs, dv_list)for((dv) = ((&alldevs)->tqh_first); (dv) != ((void *)0 ); (dv) = ((dv)->dv_list.tqe_next)) { |
91 | if (dv->dv_class != DV_DISK) |
92 | continue; |
93 | bp->b_dev = dev = dev_rawpart(dv); |
94 | if (dev == NODEV(dev_t)(-1)) |
95 | continue; |
96 | bdsw = &bdevsw[major(dev)(((unsigned)(dev) >> 8) & 0xff)]; |
97 | |
98 | /* |
99 | * This open operation guarantees a proper initialization |
100 | * of the device, for future strategy calls. |
101 | */ |
102 | error = (*bdsw->d_open)(dev, FREAD0x0001, S_IFCHR0020000, curproc({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc); |
103 | if (error) { |
104 | /* XXX What to do here? */ |
105 | #ifdef DEBUG |
106 | printf("dkcsum: %s open failed (%d)\n", |
107 | dv->dv_xname, error); |
108 | #endif |
109 | continue; |
110 | } |
111 | |
112 | /* Read blocks to cksum. XXX maybe a d_read should be used. */ |
113 | bp->b_blkno = 0; |
114 | bp->b_bcount = bios_cksumlen * DEV_BSIZE(1 << 9); |
115 | bp->b_error = 0; /* B_ERROR and b_error may have stale data. */ |
116 | CLR(bp->b_flags, B_READ | B_WRITE | B_DONE | B_ERROR)((bp->b_flags) &= ~(0x00008000 | 0x00000000 | 0x00000100 | 0x00000400)); |
117 | SET(bp->b_flags, B_BUSY | B_READ | B_RAW)((bp->b_flags) |= (0x00000010 | 0x00008000 | 0x00004000)); |
118 | (*bdsw->d_strategy)(bp); |
119 | if ((error = biowait(bp))) { |
120 | /* XXX What to do here? */ |
121 | #ifdef DEBUG |
122 | printf("dkcsum: %s read failed (%d)\n", |
123 | dv->dv_xname, error); |
124 | #endif |
125 | error = (*bdsw->d_close)(dev, 0, S_IFCHR0020000, curproc({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc); |
Value stored to 'error' is never read | |
126 | #ifdef DEBUG |
127 | if (error) |
128 | printf("dkcsum: %s close failed (%d)\n", |
129 | dv->dv_xname, error); |
130 | #endif |
131 | continue; |
132 | } |
133 | error = (*bdsw->d_close)(dev, FREAD0x0001, S_IFCHR0020000, curproc({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r" (__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self))); __ci;})->ci_curproc); |
134 | if (error) { |
135 | /* XXX What to do here? */ |
136 | #ifdef DEBUG |
137 | printf("dkcsum: %s closed failed (%d)\n", |
138 | dv->dv_xname, error); |
139 | #endif |
140 | continue; |
141 | } |
142 | |
143 | csum = adler32(0, bp->b_data, bios_cksumlen * DEV_BSIZE(1 << 9)); |
144 | #ifdef DEBUG |
145 | printf("dkcsum: %s checksum is %#x\n", dv->dv_xname, csum); |
146 | #endif |
147 | |
148 | /* Find the BIOS device */ |
149 | hit = 0; |
150 | for (bdi = bios_diskinfo; bdi->bios_number != -1; bdi++) { |
151 | /* Skip non-harddrives */ |
152 | if (!(bdi->bios_number & 0x80)) |
153 | continue; |
154 | if (bdi->checksum != csum) |
155 | continue; |
156 | picked = hit || (bdi->flags & BDI_PICKED0x80000000); |
157 | if (!picked) |
158 | hit = bdi; |
159 | #ifdef DEBUG |
160 | printf("dkcsum: %s matches BIOS drive %#x%s\n", |
161 | dv->dv_xname, bdi->bios_number, |
162 | (picked ? " IGNORED" : "")); |
163 | #endif |
164 | } |
165 | |
166 | /* |
167 | * If we have no hit, that's OK, we can see a lot more devices |
168 | * than the BIOS can, so this case is pretty normal. |
169 | */ |
170 | if (!hit) { |
171 | #ifdef DEBUG |
172 | printf("dkcsum: %s has no matching BIOS drive\n", |
173 | dv->dv_xname); |
174 | #endif |
175 | continue; |
176 | } |
177 | |
178 | /* |
179 | * Fixup bootdev if units match. This means that all of |
180 | * hd*, sd*, wd*, will be interpreted the same. Not 100% |
181 | * backwards compatible, but sd* and wd* should be phased- |
182 | * out in the bootblocks. |
183 | */ |
184 | |
185 | /* B_TYPE dependent hd unit counting bootblocks */ |
186 | if ((B_ADAPTOR(bootdev)(((bootdev) >> 24) & 0x0f) == B_ADAPTOR(hit->bsd_dev)(((hit->bsd_dev) >> 24) & 0x0f)) && |
187 | (B_CONTROLLER(bootdev)(((bootdev)>>20) & 0xf) == B_CONTROLLER(hit->bsd_dev)(((hit->bsd_dev)>>20) & 0xf)) && |
188 | (B_TYPE(bootdev)(((bootdev) >> 0) & 0xff) == B_TYPE(hit->bsd_dev)(((hit->bsd_dev) >> 0) & 0xff)) && |
189 | (B_UNIT(bootdev)(((bootdev) >> 16) & 0xf) == B_UNIT(hit->bsd_dev)(((hit->bsd_dev) >> 16) & 0xf))) { |
190 | int type, ctrl, adap, part, unit; |
191 | |
192 | type = major(bp->b_dev)(((unsigned)(bp->b_dev) >> 8) & 0xff); |
193 | adap = B_ADAPTOR(bootdev)(((bootdev) >> 24) & 0x0f); |
194 | ctrl = B_CONTROLLER(bootdev)(((bootdev)>>20) & 0xf); |
195 | unit = DISKUNIT(bp->b_dev)(((unsigned)((bp->b_dev) & 0xff) | (((bp->b_dev) & 0xffff0000) >> 8)) / 16); |
196 | part = B_PARTITION(bootdev)(((bootdev) >> 8) & 0xff); |
197 | |
198 | pribootdev = MAKEBOOTDEV(type, ctrl, adap, unit, part)(((type) << 0) | ((ctrl) << 24) | ((adap) << 20) | ((unit) << 16) | ((part) << 8) | 0xa0000000 ); |
199 | #ifdef DEBUG |
200 | printf("dkcsum: %s is primary boot disk\n", |
201 | dv->dv_xname); |
202 | #endif |
203 | } |
204 | /* B_TYPE independent hd unit counting bootblocks */ |
205 | if (B_UNIT(bootdev)(((bootdev) >> 16) & 0xf) == (hit->bios_number & 0x7F)) { |
206 | int type, ctrl, adap, part, unit; |
207 | |
208 | type = major(bp->b_dev)(((unsigned)(bp->b_dev) >> 8) & 0xff); |
209 | adap = B_ADAPTOR(bootdev)(((bootdev) >> 24) & 0x0f); |
210 | ctrl = B_CONTROLLER(bootdev)(((bootdev)>>20) & 0xf); |
211 | unit = DISKUNIT(bp->b_dev)(((unsigned)((bp->b_dev) & 0xff) | (((bp->b_dev) & 0xffff0000) >> 8)) / 16); |
212 | part = B_PARTITION(bootdev)(((bootdev) >> 8) & 0xff); |
213 | |
214 | altbootdev = MAKEBOOTDEV(type, ctrl, adap, unit, part)(((type) << 0) | ((ctrl) << 24) | ((adap) << 20) | ((unit) << 16) | ((part) << 8) | 0xa0000000 ); |
215 | #ifdef DEBUG |
216 | printf("dkcsum: %s is alternate boot disk\n", |
217 | dv->dv_xname); |
218 | #endif |
219 | } |
220 | |
221 | /* This will overwrite /boot's guess, just so you remember */ |
222 | hit->bsd_dev = MAKEBOOTDEV(major(bp->b_dev), 0, 0,((((((unsigned)(bp->b_dev) >> 8) & 0xff)) << 0) | ((0) << 24) | ((0) << 20) | (((((unsigned)( (bp->b_dev) & 0xff) | (((bp->b_dev) & 0xffff0000 ) >> 8)) / 16)) << 16) | ((2) << 8) | 0xa0000000 ) |
223 | DISKUNIT(bp->b_dev), RAW_PART)((((((unsigned)(bp->b_dev) >> 8) & 0xff)) << 0) | ((0) << 24) | ((0) << 20) | (((((unsigned)( (bp->b_dev) & 0xff) | (((bp->b_dev) & 0xffff0000 ) >> 8)) / 16)) << 16) | ((2) << 8) | 0xa0000000 ); |
224 | hit->flags |= BDI_PICKED0x80000000; |
225 | } |
226 | bootdev = pribootdev ? pribootdev : altbootdev ? altbootdev : bootdev; |
227 | |
228 | bp->b_flags |= B_INVAL0x00000800; |
229 | brelse(bp); |
230 | } |