drvlib.h

一个简单的操作系统minix的核心代码

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				src/kernel/drvlib.h	 	 
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09400	/* IBM device driver definitions                        Author: Kees J. Bot
09401	 *                                                              7 Dec 1995
09402	 */
09403	
09404	#include <ibm/partition.h>
09405	
09406	_PROTOTYPE( void partition, (struct driver *dr, int device, int style) );
09407	
09408	/* BIOS parameter table layout. */
09409	#define bp_cylinders(t)         (* (u16_t *) (&(t)[0]))
09410	#define bp_heads(t)             (* (u8_t *)  (&(t)[2]))
09411	#define bp_reduced_wr(t)        (* (u16_t *) (&(t)[3]))
09412	#define bp_precomp(t)           (* (u16_t *) (&(t)[5]))
09413	#define bp_max_ecc(t)           (* (u8_t *)  (&(t)[7]))
09414	#define bp_ctlbyte(t)           (* (u8_t *)  (&(t)[8]))
09415	#define bp_landingzone(t)       (* (u16_t *) (&(t)[12]))
09416	#define bp_sectors(t)           (* (u8_t *)  (&(t)[14]))
09417	
09418	/* Miscellaneous. */
09419	#define DEV_PER_DRIVE   (1 + NR_PARTITIONS)
09420	#define MINOR_hd1a      128
09421	#define MINOR_fd0a      (28<<2)
09422	#define P_FLOPPY        0
09423	#define P_PRIMARY       1
09424	#define P_SUB           2