Commit | Line | Data |
---|---|---|
6e210388 DR |
1 | # |
2 | /* | |
3 | */ | |
4 | ||
5 | /* | |
6 | * VT01 driver via DR11C to 11/20 | |
7 | */ | |
8 | ||
9 | #include "../param.h" | |
10 | #include "../user.h" | |
11 | ||
12 | int vtflag; | |
13 | ||
14 | struct vtreg { | |
15 | int csr; | |
16 | int buf; | |
17 | }; | |
18 | ||
19 | #define VTADDR 0167770 | |
20 | #define RQINT 01 | |
21 | #define BIENABL 040 | |
22 | #define SEOF 0100000 | |
23 | #define VTPRI 8 | |
24 | ||
25 | vtopen(dev, flag) | |
26 | { | |
27 | if (!flag) | |
28 | u.u_error = ENXIO; | |
29 | else | |
30 | VTADDR->csr = BIENABL; | |
31 | } | |
32 | ||
33 | vtclose() | |
34 | { | |
35 | VTADDR->buf = SEOF; | |
36 | VTADDR->csr =| RQINT; | |
37 | } | |
38 | ||
39 | vtwrite() | |
40 | { | |
41 | register int c; | |
42 | int register count; | |
43 | ||
44 | while ((c=cpass()) >= 0) { | |
45 | retry: | |
46 | for (count=0; count<10; count++) | |
47 | if ((VTADDR->csr&RQINT)==0) { | |
48 | VTADDR->buf = c&0377; | |
49 | VTADDR->csr =| RQINT; | |
50 | goto contin; | |
51 | } | |
52 | spl5(); | |
53 | if (VTADDR->csr&RQINT) { | |
54 | vtflag++; | |
55 | sleep(VTADDR, VTPRI); | |
56 | } | |
57 | spl0(); | |
58 | goto retry; | |
59 | contin:; | |
60 | } | |
61 | } | |
62 | ||
63 | vtintr() | |
64 | { | |
65 | VTADDR->csr =& ~RQINT; | |
66 | if (vtflag) { | |
67 | vtflag = 0; | |
68 | wakeup(VTADDR); | |
69 | } | |
70 | } |