ADD file via upload

include/linux/hdreg.h

@@ -0,0 +1,65 @@
+/*
+ * This file contains some defines for the AT-hd-controller.
+ * Various sources. Check out some definitions (see comments with
+ * a ques).
+ */
+#ifndef _HDREG_H
+#define _HDREG_H
+
+/* Hd controller regs. Ref: IBM AT Bios-listing */
+#define HD_DATA		0x1f0	/* _CTL when writing */
+#define HD_ERROR	0x1f1	/* see err-bits */
+#define HD_NSECTOR	0x1f2	/* nr of sectors to read/write */
+#define HD_SECTOR	0x1f3	/* starting sector */
+#define HD_LCYL		0x1f4	/* starting cylinder */
+#define HD_HCYL		0x1f5	/* high byte of starting cyl */
+#define HD_CURRENT	0x1f6	/* 101dhhhh , d=drive, hhhh=head */
+#define HD_STATUS	0x1f7	/* see status-bits */
+#define HD_PRECOMP HD_ERROR	/* same io address, read=error, write=precomp */
+#define HD_COMMAND HD_STATUS	/* same io address, read=status, write=cmd */
+
+#define HD_CMD		0x3f6
+
+/* Bits of HD_STATUS */
+#define ERR_STAT	0x01
+#define INDEX_STAT	0x02
+#define ECC_STAT	0x04	/* Corrected error */
+#define DRQ_STAT	0x08
+#define SEEK_STAT	0x10
+#define WRERR_STAT	0x20
+#define READY_STAT	0x40
+#define BUSY_STAT	0x80
+
+/* Values for HD_COMMAND */
+#define WIN_RESTORE		0x10
+#define WIN_READ		0x20
+#define WIN_WRITE		0x30
+#define WIN_VERIFY		0x40
+#define WIN_FORMAT		0x50
+#define WIN_INIT		0x60
+#define WIN_SEEK 		0x70
+#define WIN_DIAGNOSE		0x90
+#define WIN_SPECIFY		0x91
+
+/* Bits for HD_ERROR */
+#define MARK_ERR	0x01	/* Bad address mark ? */
+#define TRK0_ERR	0x02	/* couldn't find track 0 */
+#define ABRT_ERR	0x04	/* ? */
+#define ID_ERR		0x10	/* ? */
+#define ECC_ERR		0x40	/* ? */
+#define	BBD_ERR		0x80	/* ? */
+
+struct partition {
+	unsigned char boot_ind;		/* 0x80 - active (unused) */
+	unsigned char head;		/* ? */
+	unsigned char sector;		/* ? */
+	unsigned char cyl;		/* ? */
+	unsigned char sys_ind;		/* ? */
+	unsigned char end_head;		/* ? */
+	unsigned char end_sector;	/* ? */
+	unsigned char end_cyl;		/* ? */
+	unsigned int start_sect;	/* starting sector counting from 0 */
+	unsigned int nr_sects;		/* nr of sectors in partition */
+};
+
+#endif