1 /* 2 * Copyright (c) 1982, 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)saio.h 7.15 (Berkeley) 06/28/90 8 */ 9 10 #include "../ufs/fs.h" 11 #include "../ufs/dinode.h" 12 #include "saioctl.h" 13 #include "saerrno.h" 14 15 #define UNIX "/vmunix" 16 #define NULL 0 17 18 /* 19 * Io block: includes an dinode, cells for the use of seek, etc., 20 * and a buffer. 21 */ 22 struct iob { 23 int i_flgs; /* see F_ below */ 24 int i_adapt; /* adapter or bus */ 25 int i_ctlr; /* controller */ 26 int i_unit; /* pseudo device unit */ 27 int i_part; /* disk partition */ 28 daddr_t i_boff; /* block offset on device */ 29 struct dinode i_ino; /* dinode, if file */ 30 daddr_t i_cyloff; /* cylinder offset on device */ 31 off_t i_offset; /* seek offset in file */ 32 dev_t i_dev; /* associated device */ 33 daddr_t i_bn; /* 1st block # of next read */ 34 char *i_ma; /* memory address of i/o buffer */ 35 int i_cc; /* character count of transfer */ 36 int i_error; /* error # return */ 37 int i_errcnt; /* error count for driver retries */ 38 int i_errblk; /* block # in error for error reporting */ 39 char i_buf[MAXBSIZE];/* i/o buffer */ 40 union { 41 struct fs ui_fs; /* file system super block info */ 42 char dummy[SBSIZE]; 43 } i_un; 44 }; 45 46 #define i_fs i_un.ui_fs 47 #define i_bus i_adapt 48 49 /* codes for sector header word 1 */ 50 #define HDR1_FMT22 0x1000 /* standard 16 bit format */ 51 #define HDR1_OKSCT 0xc000 /* sector ok */ 52 #define HDR1_SSF 0x2000 /* skip sector flag */ 53 54 #define F_READ 0x0001 /* file opened for reading */ 55 #define F_WRITE 0x0002 /* file opened for writing */ 56 #define F_ALLOC 0x0004 /* buffer allocated */ 57 #define F_FILE 0x0008 /* file instead of device */ 58 #define F_NBSF 0x0010 /* no bad sector forwarding */ 59 #define F_ECCLM 0x0020 /* limit # of bits in ecc correction */ 60 #define F_SSI 0x0040 /* set skip sector inhibit */ 61 #define F_SEVRE 0x0080 /* Severe burnin (no retries, no ECC) */ 62 63 /* io types */ 64 #define F_RDDATA 0x0100 /* read data */ 65 #define F_WRDATA 0x0200 /* write data */ 66 #define F_HDR 0x0400 /* include header on next i/o */ 67 #define F_CHECK 0x0800 /* perform check of data read/write */ 68 #define F_HCHECK 0x1000 /* perform check of header and data */ 69 70 #define F_TYPEMASK 0xff00 71 72 #define READ F_READ 73 #define WRITE F_WRITE 74 75 /* 76 * Lseek call. 77 */ 78 #define L_SET 0 /* absolute offset */ 79 80 /* 81 * Device switch. 82 */ 83 struct devsw { 84 char *dv_name; 85 int (*dv_strategy)(); 86 int (*dv_open)(); 87 int (*dv_close)(); 88 int (*dv_ioctl)(); 89 }; 90 91 extern struct devsw devsw[]; /* device array */ 92 extern int ndevs; /* number of elements in devsw[] */ 93 94 #ifdef COMPAT_42 95 /* 96 * Old drive description table. 97 * still used by some drivers for now. 98 */ 99 struct st { 100 short nsect; /* # sectors/track */ 101 short ntrak; /* # tracks/surfaces/heads */ 102 short nspc; /* # sectors/cylinder */ 103 short ncyl; /* # cylinders */ 104 short *off; /* partition offset table (cylinders) */ 105 }; 106 #endif 107 108 #define NFILES 4 109 extern struct iob iob[NFILES]; 110