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/*

 * disk.h -- disk simulation

 */

#ifndef _DISK_H_

#define _DISK_H_

#define SECTOR_SIZE     512     /* sector size in bytes */

#define DISK_CTRL       0        /* control register */

#define DISK_CNT        4       /* sector count register */

#define DISK_SCT        8       /* disk sector register */

#define DISK_CAP        12      /* disk capacity register */

#define DISK_STRT       0x01    /* a 1 written here starts the disk command */

#define DISK_IEN        0x02    /* enable disk interrupt */

#define DISK_WRT        0x04    /* command type: 0 = read, 1 = write */

#define DISK_ERR        0x08    /* 0 = ok, 1 = error; valid when DONE = 1 */

#define DISK_DONE       0x10    /* 1 = disk has finished the command */

#define DISK_READY      0x20    /* 1 = capacity valid, disk accepts command */

#define DISK_DELAY_USEC 10000   /* seek start/settle + rotational delay */

#define DISK_SEEK_USEC  50000   /* full disk seek time */

#define DISK_START_USEC 1000000 /* disk startup time (until DISK_READY) */

Word diskRead(Word addr);

void diskWrite(Word addr, Word data);

void diskReset(void);

void diskInit(char *diskImageName);

void diskExit(void);

#endif /* _DISK_H_ */