projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 9893f627 DR |
1 | # |
| 2 | /* | |
| 3 | */ | |
| 4 | ||
| 5 | /* | |
| 6 | * GP DR11C driver used for C/A/T | |
| 7 | */ | |
| 8 | ||
| 9 | #include "../param.h" | |
| 10 | #include "../user.h" | |
| 11 | #include "../tty.h" | |
| 12 | ||
| 13 | #define CATADDR 0167750 | |
| 14 | #define PCAT 9 | |
| 15 | #define CATHIWAT 60 | |
| 16 | #define CATLOWAT 15 | |
| 17 | ||
| 18 | struct { | |
| 19 | int catlock; | |
| 20 | struct clist oq; | |
| 21 | } cat; | |
| 22 | ||
| 23 | struct { | |
| 24 | int catcsr; | |
| 25 | int catbuf; | |
| 26 | }; | |
| 27 | ||
| 28 | ctopen(dev) | |
| 29 | { | |
| 30 | if (cat.catlock==0) { | |
| 31 | cat.catlock++; | |
| 32 | CATADDR->catcsr =| IENABLE; | |
| 33 | } else | |
| 34 | u.u_error = ENXIO; | |
| 35 | } | |
| 36 | ||
| 37 | ctclose() | |
| 38 | { | |
| 39 | cat.catlock = 0; | |
| 40 | } | |
| 41 | ||
| 42 | ctwrite(dev) | |
| 43 | { | |
| 44 | register c; | |
| 45 | extern lbolt; | |
| 46 | ||
| 47 | while ((c=cpass()) >= 0) { | |
| 48 | spl5(); | |
| 49 | while (cat.oq.c_cc > CATHIWAT) | |
| 50 | sleep(&cat.oq, PCAT); | |
| 51 | while (putc(c, &cat.oq) < 0) | |
| 52 | sleep(&lbolt, PCAT); | |
| 53 | catintr(); | |
| 54 | spl0(); | |
| 55 | } | |
| 56 | } | |
| 57 | ||
| 58 | catintr() | |
| 59 | { | |
| 60 | register int c; | |
| 61 | ||
| 62 | if (CATADDR->catcsr&DONE && (c=getc(&cat.oq))>=0) { | |
| 63 | CATADDR->catbuf = c; | |
| 64 | if (cat.oq.c_cc==0 || cat.oq.c_cc==CATLOWAT) | |
| 65 | wakeup(&cat.oq); | |
| 66 | } else { | |
| 67 | if (cat.catlock==0) | |
| 68 | CATADDR->catcsr = 0; | |
| 69 | } | |
| 70 | } |