projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 75ead5a5 BJ |
1 | /* |
| 2 | * AT floppy controller registers and bitfields | |
| 8dfab1b8 | 3 | * @(#)fdreg.h 1.2 (Berkeley) %G% |
| 75ead5a5 BJ |
4 | */ |
| 5 | ||
| 6 | /* uses NEC765 controller */ | |
| 7 | #include "../i386/isa/ic/nec765.h" | |
| 8 | ||
| 9 | /* registers */ | |
| 10 | #define fdout 2 /* Digital Output Register (W) */ | |
| 11 | #define FDO_FDSEL 0x01 /* floppy device select */ | |
| 12 | #define FDO_FRST 0x04 /* floppy controller reset */ | |
| 13 | #define FDO_FDMAEN 0x08 /* enable floppy DMA and Interrupt */ | |
| 14 | #define FDO_MOEN0 0x10 /* motor enable drive 0 */ | |
| 15 | #define FDO_MOEN1 0x20 /* motor enable drive 1 */ | |
| 16 | ||
| 17 | #define fdsts 4 /* NEC 765 Main Status Register (R) */ | |
| 18 | #define fddata 5 /* NEC 765 Data Register (R/W) */ | |
| 19 | ||
| 20 | #define fdctl 7 /* Control Register (W) */ | |
| 21 | #define FDC_500KBPS 0x00 /* 500KBPS MFM drive transfer rate */ | |
| 22 | #define FDC_300KBPS 0x01 /* 300KBPS MFM drive transfer rate */ | |
| 23 | #define FDC_250KBPS 0x02 /* 250KBPS MFM drive transfer rate */ | |
| 24 | #define FDC_125KBPS 0x03 /* 125KBPS FM drive transfer rate */ | |
| 25 | ||
| 26 | #define fdin 7 /* Digital Input Register (R) */ | |
| 27 | #define FDI_DCHG 0x80 /* diskette has been changed */ | |
| 28 | ||
| 29 |