1 /*
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 *
7 * @(#)dev.c 8.1 (Berkeley) 06/11/93
8 */
9
10 #include <sys/param.h>
11 #include <setjmp.h>
12 #include <stand.att/saio.h>
13
14 /*
15 * NB: the value "io->i_dev", used to offset the devsw[] array in the
16 * routines below, is munged by the machine specific stand Makefiles
17 * to work for certain boots.
18 */
19
20 jmp_buf exception;
21
devread(io)22 devread(io)
23 register struct iob *io;
24 {
25 int cc;
26
27 io->i_flgs |= F_RDDATA;
28 io->i_error = 0;
29 cc = (*devsw[io->i_dev].dv_strategy)(io, F_READ);
30 io->i_flgs &= ~F_TYPEMASK;
31 #ifndef SMALL
32 if (scankbd())
33 _longjmp(exception, 1);
34 #endif
35 return (cc);
36 }
37
devwrite(io)38 devwrite(io)
39 register struct iob *io;
40 {
41 int cc;
42
43 io->i_flgs |= F_WRDATA;
44 io->i_error = 0;
45 cc = (*devsw[io->i_dev].dv_strategy)(io, F_WRITE);
46 io->i_flgs &= ~F_TYPEMASK;
47 #ifndef SMALL
48 if (scankbd())
49 _longjmp(exception, 1);
50 #endif
51 return (cc);
52 }
53
devopen(io)54 devopen(io)
55 register struct iob *io;
56 {
57 int ret;
58
59 if (!(ret = (*devsw[io->i_dev].dv_open)(io)))
60 return (0);
61 #ifdef SMALL
62 printf("open error\n");
63 #else
64 printf("%s(%d,%d,%d,%d): ", devsw[io->i_dev].dv_name,
65 io->i_adapt, io->i_ctlr, io->i_unit, io->i_part);
66 switch(ret) {
67 case EIO:
68 break; /* already reported */
69 case EADAPT:
70 printf("bad adaptor number\n");
71 break;
72 case ECTLR:
73 printf("bad controller number\n");
74 break;
75 case EUNIT:
76 printf("bad drive number\n");
77 break;
78 case EPART:
79 printf("bad partition\n");
80 break;
81 case ERDLAB:
82 printf("can't read disk label\n");
83 break;
84 case EUNLAB:
85 printf("unlabeled\n");
86 break;
87 case ENXIO:
88 printf("bad device specification\n");
89 break;
90 default:
91 printf("unknown open error\n");
92 break;
93 }
94 #endif
95 return (ret);
96 }
97
devclose(io)98 devclose(io)
99 register struct iob *io;
100 {
101 (*devsw[io->i_dev].dv_close)(io);
102 }
103
devioctl(io,cmd,arg)104 devioctl(io, cmd, arg)
105 register struct iob *io;
106 int cmd;
107 caddr_t arg;
108 {
109 return ((*devsw[io->i_dev].dv_ioctl)(io, cmd, arg));
110 }
111
112 /* ARGSUSED */
113 nullsys(io)
114 struct iob *io;
115 {}
116
117 /* ARGSUSED */
118 nodev(io)
119 struct iob *io;
120 {
121 errno = EBADF;
122 return(-1);
123 }
124
125 /* ARGSUSED */
126 noioctl(io, cmd, arg)
127 struct iob *io;
128 int cmd;
129 caddr_t arg;
130 {
131 return (ECMD);
132 }
133