1 /* saio.h 1.2 86/12/18 */ 2 3 /* saio.h 6.2 9/23/83 */ 4 5 /* 6 * Header file for standalone package 7 */ 8 9 /* 10 * Io block: includes an 11 * inode, cells for the use of seek, etc, 12 * and a buffer. 13 */ 14 struct iob { 15 int i_flgs; /* see F_ below */ 16 struct inode i_ino; /* inode, if file */ 17 int i_unit; /* pseudo device unit */ 18 daddr_t i_boff; /* block offset on device */ 19 daddr_t i_cyloff; /* cylinder offset on device */ 20 off_t i_offset; /* seek offset in file */ 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 char i_buf[MAXBSIZE];/* i/o buffer */ 28 union { 29 struct fs ui_fs; /* file system super block info */ 30 char dummy[SBSIZE]; 31 } i_un; 32 }; 33 #define i_fs i_un.ui_fs 34 #define NULL 0 35 36 #define F_READ 0x1 /* file opened for reading */ 37 #define F_WRITE 0x2 /* file opened for writing */ 38 #define F_ALLOC 0x4 /* buffer allocated */ 39 #define F_FILE 0x8 /* file instead of device */ 40 #define F_NBSF 0x10 /* no bad sector forwarding */ 41 #define F_ECCLM 0x20 /* limit # of bits in ecc correction */ 42 #define F_SSI 0x40 /* set skip sector inhibit */ 43 #define F_SEVRE 0x80 /* Severe burnin (no retries, no ECC) */ 44 /* io 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 52 53 /* 54 * Device switch. 55 */ 56 struct devsw { 57 char *dv_name; 58 int (*dv_strategy)(); 59 int (*dv_open)(); 60 int (*dv_close)(); 61 int (*dv_ioctl)(); 62 }; 63 64 struct devsw devsw[]; 65 int ndevs; 66 67 /* 68 * Drive description table. 69 * Returned from SAIODEVDATA call. 70 */ 71 struct st { 72 short nsect; /* # sectors/track */ 73 short ntrak; /* # tracks/surfaces/heads */ 74 short nspc; /* # sectors/cylinder */ 75 short ncyl; /* # cylinders */ 76 short *off; /* partition offset table (cylinders) */ 77 }; 78 79 /* 80 * Request codes. Must be the same a F_XXX above 81 */ 82 #define READ 1 83 #define WRITE 2 84 85 #define NBUFS 4 86 87 char b[NBUFS][MAXBSIZE]; 88 daddr_t blknos[NBUFS]; 89 90 #define NFILES 4 91 struct iob iob[NFILES]; 92 93 extern int errno; /* just like unix */ 94 95 /* error codes */ 96 #define EBADF 1 /* bad file descriptor */ 97 #define EOFFSET 2 /* relative seek not supported */ 98 #define EDEV 3 /* improper device specification on open */ 99 #define ENXIO 4 /* unknown device specified */ 100 #define EUNIT 5 /* improper unit specification */ 101 #define ESRCH 6 /* directory search for file failed */ 102 #define EIO 7 /* generic error */ 103 #define ECMD 10 /* undefined driver command */ 104 #define EBSE 11 /* bad sector error */ 105 #define EWCK 12 /* write check error */ 106 #define EECC 13 /* uncorrectable ecc error */ 107 #define EHER 14 /* hard error */ 108 109 /* ioctl's -- for disks just now */ 110 #define SAIOHDR (('d'<<8)|1) /* next i/o includes header */ 111 #define SAIOCHECK (('d'<<8)|2) /* next i/o checks data */ 112 #define SAIOHCHECK (('d'<<8)|3) /* next i/o checks header & data */ 113 #define SAIONOBAD (('d'<<8)|4) /* inhibit bad sector forwarding */ 114 #define SAIODOBAD (('d'<<8)|5) /* enable bad sector forwarding */ 115 #define SAIOECCLIM (('d'<<8)|6) /* limit ecc correction to 5 bits */ 116 #define SAIOECCUNL (('d'<<8)|7) /* use standard ecc procedures */ 117 #define SAIODEVDATA (('d'<<8)|8) /* get device data */ 118 #define SAIOSSI (('d'<<8)|9) /* set skip sector inhibit */ 119 #define SAIONOSSI (('d'<<8)|10) /* inhibit skip sector handling */ 120 #define SAIOSSDEV (('d'<<8)|11) /* is device skip sector type? */ 121 #define SAIODEBUG (('d'<<8)|12) /* enable/disable debugging */ 122 #define SAIOSEVRE (('d'<<8)|13) /* severe burnin, no ECC, no retries */ 123 #define SAIONSEVRE (('d'<<8)|14) /* clear severe burnin */ 124 125 /* codes for sector header word 1 */ 126 #define HDR1_FMT22 0x1000 /* standard 16 bit format */ 127 #define HDR1_OKSCT 0xc000 /* sector ok */ 128 #define HDR1_SSF 0x2000 /* skip sector flag */ 129