/* * Copyright (c) 1988 Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * @(#)rx50reg.h 7.1 (Berkeley) 7/9/88 */ /* * RX50 registers. */ /* * The names below do not quite match the DEC documentation simply because * the names in the documentation are so bad. */ struct rx50device { u_short rxid; /* identification */ u_short reserved; u_short rxcmd; /* command function reg */ u_short rxtrk; /* track */ u_short rxsec; /* sector */ u_short rxcsc; /* current sector */ u_short rxict; /* incorrect track (???) */ u_short rxext; /* extend command register */ u_short rxedb; /* empty data buffer (read) */ u_short rxrda; /* reset data address */ u_short rxgo; /* read to start current cmd */ u_short rxfdb; /* fill data buffer (write) */ }; #define RX50SEC 10 /* sectors per track */ #define RX50MAXSEC 800 /* 10 sectors times 80 tracks */ /* * Do the sector skew given the sector and track * number (it depends on both!). */ /* (((((s) / 5) + 2 * ((s) + (t))) % 10) + 1) */ #define RX50SKEW(s, t) (((s) / 5) + "\1\3\5\7\11\1\3\5\7"[((s) + (t)) % 5]) /* * Values in the command function register. */ #define RXCMD_ERROR 0x80 /* error bit (composite?) */ #define RXCMD_READ 0x40 /* read command */ #define RXCMD_WRITE 0x70 /* write command */ #define RXCMD_RESET 0x20 /* reset command */ #define RXCMD_DONE 0x08 /* operation done (status) */ #define RXCMD_DRIVE0 0x00 /* select drive 0 (csa1) */ #define RXCMD_DRIVE1 0x02 /* select drive 1 (csa2) */