projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| a4a6e3a7 DR |
1 | # |
| 2 | /* | |
| 3 | * RF disk driver | |
| 4 | */ | |
| 5 | ||
| 6 | #include "../h/param.h" | |
| 7 | #include "../h/systm.h" | |
| 8 | #include "../h/buf.h" | |
| 9 | #include "../h/conf.h" | |
| 10 | #include "../h/dir.h" | |
| 11 | #include "../h/user.h" | |
| 12 | ||
| 13 | struct device { | |
| 14 | int rfcs; | |
| 15 | int rfwc; | |
| 16 | char *rfba; | |
| 17 | int rfda; | |
| 18 | int rfdae; | |
| 19 | }; | |
| 20 | ||
| 21 | struct buf rftab; | |
| 22 | struct buf rrfbuf; | |
| 23 | ||
| 24 | #define NRFBLK 1024 | |
| 25 | #define RFADDR ((struct device *)0177460) | |
| 26 | ||
| 27 | #define GO 01 | |
| 28 | #define RCOM 04 | |
| 29 | #define WCOM 02 | |
| 30 | #define CTLCLR 0400 | |
| 31 | #define IENABLE 0100 | |
| 32 | ||
| 33 | /* | |
| 34 | * Monitoring device number | |
| 35 | */ | |
| 36 | #define DK_N 0 | |
| 37 | ||
| 38 | rfstrategy(bp) | |
| 39 | register struct buf *bp; | |
| 40 | { | |
| 41 | if(bp->b_flags&B_PHYS) | |
| 42 | mapalloc(bp); | |
| 43 | if (bp->b_blkno >= NRFBLK*(minor(bp->b_dev)+1)) { | |
| 44 | bp->b_flags |= B_ERROR; | |
| 45 | iodone(bp); | |
| 46 | return; | |
| 47 | } | |
| 48 | bp->av_forw = 0; | |
| 49 | spl5(); | |
| 50 | if (rftab.b_actf == NULL) | |
| 51 | rftab.b_actf = bp; | |
| 52 | else | |
| 53 | rftab.b_actl->av_forw = bp; | |
| 54 | rftab.b_actl = bp; | |
| 55 | if (rftab.b_active == NULL) | |
| 56 | rfstart(); | |
| 57 | spl0(); | |
| 58 | } | |
| 59 | ||
| 60 | rfstart() | |
| 61 | { | |
| 62 | register struct buf *bp; | |
| 63 | register int com; | |
| 64 | ||
| 65 | if ((bp = rftab.b_actf) == NULL) | |
| 66 | return; | |
| 67 | rftab.b_active++; | |
| 68 | RFADDR->rfda = (int)(bp->b_blkno<<8)&0177777; | |
| 69 | RFADDR->rfdae = (int)(bp->b_blkno>>8)&037; | |
| 70 | RFADDR->rfba = bp->b_un.b_addr; | |
| 71 | RFADDR->rfwc = -(bp->b_bcount>>1); | |
| 72 | com = (bp->b_xmem&3) << 4; | |
| 73 | com |= (bp->b_flags & B_READ) ? RCOM+GO+IENABLE : WCOM+GO+IENABLE; | |
| 74 | RFADDR->rfcs = com; | |
| 75 | dk_busy |= 1<<DK_N; | |
| 76 | dk_numb[DK_N] += 1; | |
| 77 | com = (-bp->b_bcount>>5) & 03777; | |
| 78 | dk_wds[DK_N] += com; | |
| 79 | } | |
| 80 | ||
| 81 | rfintr() | |
| 82 | { | |
| 83 | register struct buf *bp; | |
| 84 | ||
| 85 | if (rftab.b_active == NULL) | |
| 86 | return; | |
| 87 | dk_busy &= ~(1<<DK_N); | |
| 88 | bp = rftab.b_actf; | |
| 89 | rftab.b_active = NULL; | |
| 90 | if (RFADDR->rfcs < 0) { /* error bit */ | |
| 91 | deverror(bp, RFADDR->rfcs, RFADDR->rfdae); | |
| 92 | RFADDR->rfcs = CTLCLR; | |
| 93 | if (++rftab.b_errcnt <= 10) { | |
| 94 | rfstart(); | |
| 95 | return; | |
| 96 | } | |
| 97 | bp->b_flags |= B_ERROR; | |
| 98 | } | |
| 99 | rftab.b_errcnt = 0; | |
| 100 | rftab.b_actf = bp->av_forw; | |
| 101 | bp->b_resid = 0; | |
| 102 | iodone(bp); | |
| 103 | rfstart(); | |
| 104 | } | |
| 105 | ||
| 106 | rfread(dev) | |
| 107 | { | |
| 108 | ||
| 109 | physio(rfstrategy, &rrfbuf, dev, B_READ); | |
| 110 | } | |
| 111 | ||
| 112 | rfwrite(dev) | |
| 113 | { | |
| 114 | ||
| 115 | physio(rfstrategy, &rrfbuf, dev, B_WRITE); | |
| 116 | } |