1 /* saio.h 6.1 07/29/83 */ 2 3 /* 4 * Header file for standalone package 5 */ 6 7 /* 8 * Io block: includes an 9 * inode, cells for the use of seek, etc, 10 * and a buffer. 11 */ 12 struct iob { 13 int i_flgs; /* see F_ below */ 14 struct inode i_ino; /* inode, if file */ 15 int i_unit; /* pseudo device unit */ 16 daddr_t i_boff; /* block offset on device */ 17 daddr_t i_cyloff; /* cylinder offset on device */ 18 off_t i_offset; /* seek offset in file */ 19 daddr_t i_bn; /* 1st block # of next read */ 20 char *i_ma; /* memory address of i/o buffer */ 21 int i_cc; /* character count of transfer */ 22 int i_error; /* error # return */ 23 int i_errcnt; /* error count for driver retries */ 24 int i_errblk; /* block # in error for error reporting */ 25 char i_buf[MAXBSIZE];/* i/o buffer */ 26 union { 27 struct fs ui_fs; /* file system super block info */ 28 char dummy[SBSIZE]; 29 } i_un; 30 }; 31 #define i_fs i_un.ui_fs 32 #define NULL 0 33 34 #define F_READ 0x1 /* file opened for reading */ 35 #define F_WRITE 0x2 /* file opened for writing */ 36 #define F_ALLOC 0x4 /* buffer allocated */ 37 #define F_FILE 0x8 /* file instead of device */ 38 #define F_NBSF 0x10 /* no bad sector forwarding */ 39 #define F_ECCLM 0x20 /* limit # of bits in ecc correction */ 40 #define F_SSI 0x40 /* set skip sector inhibit */ 41 /* io types */ 42 #define F_RDDATA 0x0100 /* read data */ 43 #define F_WRDATA 0x0200 /* write data */ 44 #define F_HDR 0x0400 /* include header on next i/o */ 45 #define F_CHECK 0x0800 /* perform check of data read/write */ 46 #define F_HCHECK 0x1000 /* perform check of header and data */ 47 48 #define F_TYPEMASK 0xff00 49 50 /* 51 * Device switch. 52 */ 53 struct devsw { 54 char *dv_name; 55 int (*dv_strategy)(); 56 int (*dv_open)(); 57 int (*dv_close)(); 58 int (*dv_ioctl)(); 59 }; 60 61 struct devsw devsw[]; 62 63 /* 64 * Drive description table. 65 * Returned from SAIODEVDATA call. 66 */ 67 struct st { 68 short nsect; /* # sectors/track */ 69 short ntrak; /* # tracks/surfaces/heads */ 70 short nspc; /* # sectors/cylinder */ 71 short ncyl; /* # cylinders */ 72 short *off; /* partition offset table (cylinders) */ 73 }; 74 75 /* 76 * Request codes. Must be the same a F_XXX above 77 */ 78 #define READ 1 79 #define WRITE 2 80 81 #define NBUFS 4 82 83 char b[NBUFS][MAXBSIZE]; 84 daddr_t blknos[NBUFS]; 85 86 #define NFILES 4 87 struct iob iob[NFILES]; 88 89 extern int errno; /* just like unix */ 90 91 /* error codes */ 92 #define EBADF 1 /* bad file descriptor */ 93 #define EOFFSET 2 /* relative seek not supported */ 94 #define EDEV 3 /* improper device specification on open */ 95 #define ENXIO 4 /* unknown device specified */ 96 #define EUNIT 5 /* improper unit specification */ 97 #define ESRCH 6 /* directory search for file failed */ 98 #define EIO 7 /* generic error */ 99 #define ECMD 10 /* undefined driver command */ 100 #define EBSE 11 /* bad sector error */ 101 #define EWCK 12 /* write check error */ 102 #define EECC 13 /* uncorrectable ecc error */ 103 #define EHER 14 /* hard error */ 104 105 /* ioctl's -- for disks just now */ 106 #define SAIOHDR (('d'<<8)|1) /* next i/o includes header */ 107 #define SAIOCHECK (('d'<<8)|2) /* next i/o checks data */ 108 #define SAIOHCHECK (('d'<<8)|3) /* next i/o checks header & data */ 109 #define SAIONOBAD (('d'<<8)|4) /* inhibit bad sector forwarding */ 110 #define SAIODOBAD (('d'<<8)|5) /* enable bad sector forwarding */ 111 #define SAIOECCLIM (('d'<<8)|6) /* limit ecc correction to 5 bits */ 112 #define SAIOECCUNL (('d'<<8)|7) /* use standard ecc procedures */ 113 #define SAIODEVDATA (('d'<<8)|8) /* get device data */ 114 #define SAIOSSI (('d'<<8)|9) /* set skip sector inhibit */ 115 #define SAIONOSSI (('d'<<8)|10) /* inhibit skip sector handling */ 116 #define SAIOSSDEV (('d'<<8)|11) /* is device skip sector type? */ 117 #define SAIODEBUG (('d'<<8)|12) /* enable/disable debugging */ 118 119 /* codes for sector header word 1 */ 120 #define HDR1_FMT22 0x1000 /* standard 16 bit format */ 121 #define HDR1_OKSCT 0xc000 /* sector ok */ 122 #define HDR1_SSF 0x2000 /* skip sector flag */ 123