1 /* 2 * Copyright (c) 1982, 1988 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)saio.h 7.8 (Berkeley) 03/02/88 7 */ 8 9 #include "saioctl.h" 10 #include "saerrno.h" 11 12 #define UNIX "/vmunix" 13 #define NULL 0 14 15 /* 16 * Io block: includes an inode, cells for the use of seek, etc., 17 * and a buffer. 18 */ 19 struct iob { 20 int i_flgs; /* see F_ below */ 21 int i_adapt; /* adapter */ 22 int i_ctlr; /* controller */ 23 int i_unit; /* pseudo device unit */ 24 int i_part; /* disk partition */ 25 daddr_t i_boff; /* block offset on device */ 26 struct inode i_ino; /* inode, if file */ 27 daddr_t i_cyloff; /* cylinder offset on device */ 28 off_t i_offset; /* seek offset in file */ 29 daddr_t i_bn; /* 1st block # of next read */ 30 char *i_ma; /* memory address of i/o buffer */ 31 int i_cc; /* character count of transfer */ 32 int i_error; /* error # return */ 33 int i_errcnt; /* error count for driver retries */ 34 int i_errblk; /* block # in error for error reporting */ 35 char i_buf[MAXBSIZE];/* i/o buffer */ 36 union { 37 struct fs ui_fs; /* file system super block info */ 38 char dummy[SBSIZE]; 39 } i_un; 40 }; 41 #define i_fs i_un.ui_fs 42 43 /* codes for sector header word 1 */ 44 #define HDR1_FMT22 0x1000 /* standard 16 bit format */ 45 #define HDR1_OKSCT 0xc000 /* sector ok */ 46 #define HDR1_SSF 0x2000 /* skip sector flag */ 47 48 #define F_READ 0x1 /* file opened for reading */ 49 #define F_WRITE 0x2 /* file opened for writing */ 50 #define F_ALLOC 0x4 /* buffer allocated */ 51 #define F_FILE 0x8 /* file instead of device */ 52 #define F_NBSF 0x10 /* no bad sector forwarding */ 53 #define F_ECCLM 0x20 /* limit # of bits in ecc correction */ 54 #define F_SSI 0x40 /* set skip sector inhibit */ 55 #define F_SEVRE 0x80 /* Severe burnin (no retries, no ECC) */ 56 57 /* io types */ 58 #define F_RDDATA 0x0100 /* read data */ 59 #define F_WRDATA 0x0200 /* write data */ 60 #define F_HDR 0x0400 /* include header on next i/o */ 61 #define F_CHECK 0x0800 /* perform check of data read/write */ 62 #define F_HCHECK 0x1000 /* perform check of header and data */ 63 64 #define F_TYPEMASK 0xff00 65 66 /* 67 * Request codes. Must be the same as F_XXX above 68 */ 69 #define READ F_READ 70 #define WRITE F_WRITE 71 72 /* 73 * Lseek call. 74 */ 75 #define L_SET 0 /* absolute offset */ 76 77 /* 78 * Device switch. 79 */ 80 struct devsw { 81 char *dv_name; 82 int (*dv_strategy)(); 83 int (*dv_open)(); 84 int (*dv_close)(); 85 int (*dv_ioctl)(); 86 }; 87 88 extern struct devsw devsw[]; /* device array */ 89 extern int ndevs; /* number of elements in devsw[] */ 90 91 #ifdef COMPAT_42 92 /* 93 * Old drive description table. 94 * still used by some drivers for now. 95 */ 96 struct st { 97 short nsect; /* # sectors/track */ 98 short ntrak; /* # tracks/surfaces/heads */ 99 short nspc; /* # sectors/cylinder */ 100 short ncyl; /* # cylinders */ 101 short *off; /* partition offset table (cylinders) */ 102 }; 103 #endif 104 105 #define NFILES 4 106 extern struct iob iob[NFILES]; 107