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/*

 * common.h -- common definitions

 */

#ifndef _COMMON_H_

#define _COMMON_H_

#define K               1024            /* Kilo */

#define M               (K * K)         /* Mega */

#define RAM_BASE        0x00000000      /* physical RAM base address */

#define RAM_SIZE_MAX    (512 * M)       /* maximum RAM size */

#define RAM_SIZE_DFL    (4 * M)         /* default RAM size */

#define ROM_BASE        0x20000000      /* physical ROM base address */

#define ROM_SIZE_MAX    (256 * M)       /* maximum ROM size */

#define ROM_SIZE        (256 * K)       /* actual ROM size */

#define IO_BASE         0x30000000      /* physical I/O base address */

#define IO_SIZE_MAX     (256 * M)       /* maximum I/O size */

#define IO_DEV_MASK     0x3FF00000      /* I/O device mask */

#define IO_REG_MASK     0x000FFFFF      /* I/O register mask */

#define IO_GRAPH_MASK   0x003FFFFF      /* I/O graphics mask */

#define TIMER_BASE      0x30000000      /* physical timer base address */

#define DISPLAY_BASE    0x30100000      /* physical display base address */

#define KEYBOARD_BASE   0x30200000      /* physical keyboard base address */

#define SERIAL_BASE     0x30300000      /* physical serial line base address */

#define MAX_NSERIALS    2               /* max number of serial lines */

#define DISK_BASE       0x30400000      /* physical disk base address */

#define OUTPUT_BASE     0x3F000000      /* physical output device address */

#define SHUTDOWN_BASE   0x3F100000      /* physical shutdown device address */

#define GRAPH_BASE      0x3FC00000      /* physical grahics base address */

                                        /* extends to end of address space */

#define PAGE_SIZE       (4 * K)         /* size of a page and a page frame */

#define OFFSET_MASK     (PAGE_SIZE - 1) /* mask for offset within a page */

#define PAGE_MASK       (~OFFSET_MASK)             /* mask for page number */

#define FRAME_MASK      (PAGE_MASK & ~0xC0000000)  /* mask for frame number */

#define CC_PER_USEC     50              /* clock cycles per microsecond */

#define CC_PER_INSTR    18              /* clock cycles per instruction */

typedef enum { false, true } Bool;      /* truth values */

typedef unsigned char Byte;             /* 8 bit quantities */

typedef unsigned short Half;            /* 16 bit quantities */

typedef unsigned int Word;              /* 32 bit quantities */

#endif /* _COMMON_H_ */