1 /*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)saio.h 8.1 (Berkeley) 06/11/93 8 */ 9 10 /* I/O block */ 11 struct iob { 12 int i_flgs; /* flags (see F_*) */ 13 int i_adapt; /* adapter or bus */ 14 int i_ctlr; /* controller */ 15 int i_unit; /* pseudo device unit */ 16 int i_part; /* disk partition */ 17 daddr_t i_boff; /* block offset on device */ 18 daddr_t i_cyloff; /* cylinder offset on device */ 19 off_t i_offset; /* seek offset in file */ 20 dev_t i_dev; /* associated device */ 21 daddr_t i_bn; /* 1st block # of next read */ 22 char *i_ma; /* memory address of I/O buffer */ 23 int i_cc; /* character count of transfer */ 24 int i_error; /* error # return */ 25 int i_errcnt; /* error count for driver retries */ 26 int i_errblk; /* block # in error for error reporting */ 27 }; 28 29 /* Codes for sector header word 1 */ 30 #define HDR1_FMT22 0x1000 /* standard 16 bit format */ 31 #define HDR1_OKSCT 0xc000 /* sector ok */ 32 #define HDR1_SSF 0x2000 /* skip sector flag */ 33 34 /* I/O flag values */ 35 #define F_READ 0x0001 /* file opened for reading */ 36 #define F_WRITE 0x0002 /* file opened for writing */ 37 #define F_ALLOC 0x0004 /* buffer allocated */ 38 #define F_FILE 0x0008 /* file instead of device */ 39 #define F_NBSF 0x0010 /* no bad sector forwarding */ 40 #define F_ECCLM 0x0020 /* limit # of bits in ecc correction */ 41 #define F_SSI 0x0040 /* set skip sector inhibit */ 42 #define F_SEVRE 0x0080 /* Severe burnin (no retries, no ECC) */ 43 44 /* I/O types */ 45 #define F_RDDATA 0x0100 /* read data */ 46 #define F_WRDATA 0x0200 /* write data */ 47 #define F_HDR 0x0400 /* include header on next i/o */ 48 #define F_CHECK 0x0800 /* perform check of data read/write */ 49 #define F_HCHECK 0x1000 /* perform check of header and data */ 50 51 #define F_TYPEMASK 0xff00 /* I/O type mask */ 52 53 #ifdef COMPAT_42 54 /* 55 * Old drive description table. 56 * still used by some drivers for now. 57 */ 58 struct st { 59 short nsect; /* # sectors/track */ 60 short ntrak; /* # tracks/surfaces/heads */ 61 short nspc; /* # sectors/cylinder */ 62 short ncyl; /* # cylinders */ 63 short *off; /* partition offset table (cylinders) */ 64 }; 65 #endif 66