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66 lines
1.9 KiB
66 lines
1.9 KiB
2 years ago
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/*
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* This file contains some defines for the AT-hd-controller.
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* Various sources. Check out some definitions (see comments with
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* a ques).
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*/
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#ifndef _HDREG_H
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#define _HDREG_H
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/* Hd controller regs. Ref: IBM AT Bios-listing */
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#define HD_DATA 0x1f0 /* _CTL when writing */
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#define HD_ERROR 0x1f1 /* see err-bits */
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#define HD_NSECTOR 0x1f2 /* nr of sectors to read/write */
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#define HD_SECTOR 0x1f3 /* starting sector */
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#define HD_LCYL 0x1f4 /* starting cylinder */
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#define HD_HCYL 0x1f5 /* high byte of starting cyl */
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#define HD_CURRENT 0x1f6 /* 101dhhhh , d=drive, hhhh=head */
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#define HD_STATUS 0x1f7 /* see status-bits */
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#define HD_PRECOMP HD_ERROR /* same io address, read=error, write=precomp */
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#define HD_COMMAND HD_STATUS /* same io address, read=status, write=cmd */
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#define HD_CMD 0x3f6
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/* Bits of HD_STATUS */
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#define ERR_STAT 0x01
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#define INDEX_STAT 0x02
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#define ECC_STAT 0x04 /* Corrected error */
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#define DRQ_STAT 0x08
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#define SEEK_STAT 0x10
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#define WRERR_STAT 0x20
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#define READY_STAT 0x40
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#define BUSY_STAT 0x80
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/* Values for HD_COMMAND */
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#define WIN_RESTORE 0x10
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#define WIN_READ 0x20
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#define WIN_WRITE 0x30
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#define WIN_VERIFY 0x40
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#define WIN_FORMAT 0x50
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#define WIN_INIT 0x60
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#define WIN_SEEK 0x70
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#define WIN_DIAGNOSE 0x90
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#define WIN_SPECIFY 0x91
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/* Bits for HD_ERROR */
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#define MARK_ERR 0x01 /* Bad address mark ? */
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#define TRK0_ERR 0x02 /* couldn't find track 0 */
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#define ABRT_ERR 0x04 /* ? */
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#define ID_ERR 0x10 /* ? */
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#define ECC_ERR 0x40 /* ? */
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#define BBD_ERR 0x80 /* ? */
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struct partition {
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unsigned char boot_ind; /* 0x80 - active (unused) */
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unsigned char head; /* ? */
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unsigned char sector; /* ? */
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unsigned char cyl; /* ? */
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unsigned char sys_ind; /* ? */
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unsigned char end_head; /* ? */
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unsigned char end_sector; /* ? */
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unsigned char end_cyl; /* ? */
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unsigned int start_sect; /* starting sector counting from 0 */
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unsigned int nr_sects; /* nr of sectors in partition */
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};
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#endif
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