/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                            const.h
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                                                    Forrest Yu, 2005
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

#ifndef	_TINIX_CONST_H_
#define	_TINIX_CONST_H_


/* EXTERN */
#define	EXTERN	extern	/* EXTERN is defined as extern except in global.c */

/* 函數(shù)類型 */
#define	PUBLIC		/* PUBLIC is the opposite of PRIVATE */
#define	PRIVATE	static	/* PRIVATE x limits the scope of x */

/* Boolean */
#define	TRUE	1
#define	FALSE	0

/* GDT 和 IDT 中描述符的個數(shù) */
#define	GDT_SIZE	128
#define	IDT_SIZE	256

/* 權(quán)限 */
#define	PRIVILEGE_KRNL	0
#define	PRIVILEGE_TASK	1
#define	PRIVILEGE_USER	3
/* RPL */
#define	RPL_KRNL	SA_RPL0
#define	RPL_TASK	SA_RPL1
#define	RPL_USER	SA_RPL3

/* 8259A interrupt controller ports. */
#define	INT_M_CTL	0x20	/* I/O port for interrupt controller         <Master> */
#define	INT_M_CTLMASK	0x21	/* setting bits in this port disables ints   <Master> */
#define	INT_S_CTL	0xA0	/* I/O port for second interrupt controller  <Slave>  */
#define	INT_S_CTLMASK	0xA1	/* setting bits in this port disables ints   <Slave>  */

/* 8253/8254 PIT (Programmable Interval Timer) */
#define TIMER0          0x40	/* I/O port for timer channel 0 */
#define TIMER_MODE      0x43	/* I/O port for timer mode control */
#define RATE_GENERATOR	0x34	/* 00-11-010-0 : Counter0 - LSB then MSB - rate generator - binary */
#define TIMER_FREQ	1193182L/* clock frequency for timer in PC and AT */
#define HZ		100	/* clock freq (software settable on IBM-PC) */

/* Hardware interrupts */
#define	NR_IRQ		16	/* Number of IRQs */
#define	CLOCK_IRQ	0
#define	KEYBOARD_IRQ	1
#define	CASCADE_IRQ	2	/* cascade enable for 2nd AT controller */
#define	ETHER_IRQ	3	/* default ethernet interrupt vector */
#define	SECONDARY_IRQ	3	/* RS232 interrupt vector for port 2 */
#define	RS232_IRQ	4	/* RS232 interrupt vector for port 1 */
#define	XT_WINI_IRQ	5	/* xt winchester */
#define	FLOPPY_IRQ	6	/* floppy disk */
#define	PRINTER_IRQ	7
#define	AT_WINI_IRQ	14	/* at winchester */


/* system call */
#define	NR_SYS_CALL	1


#endif /* _TINIX_CONST_H_ */