x86.h

小型操作系统,以VC为开发环境,需要boachs调试

/***************************************************************************
**     File name   : x86.h
**     Author      : 
**     Create date :
**
**	  Comments:
**		定义了x86机器的中断号以及和硬件中断有关的...
**	
**     Revisions:
**     $Log: x86.h,v $
**     Revision 1.1.1.1  2005/07/27 06:53:15  x.cheng
**     add into repositories
**
**
***************************************************************************/
#ifndef __JCINX_INC_X86_H
#define	__JCINX_INC_X86_H
#include "io.h"

/************************************************
 * EFLAGS
 ************************************************/
#define EFLAGS_IF		0x200	//Interrupt enable flag in EFLAGS register.
#define EFLAGS_IOPL3	0x3000		//I/O privilege level 3 (minimum privilege).
									//Everyone can perform I/O operation.
#define EFLAGS_IOPL2	0x2000		//I/O privilege level 2.
#define EFLAGS_IOPL1	0x1000		//I/O privilege level 1.
#define EFLAGS_IOPL0	0x0000		//I/O privilege level 0 (maximum privilege).
									//Only the kernel can perform I/O operation.

/************************************************
 * PC 硬件端口号定义
 ************************************************/

/*********中断屏蔽寄存器的起始端口号*************/
#define PORT_8259A_MAJOR 0x20	/*主片*/

#define PORT_8259A_MINOR 0xA0	/*从片*/

#define EOI		0x20			// PIC 8259 EOI (End Of Interrupt).

/*********键盘I/O端口号**************************/
#define PORT_8255_BASE_ADDRESS	0x60	//Keyboard base address port.

#define PORT_8255_KEYB_ACK		PORT_8255_BASE_ADDRESS+1	//Keyboard acknowledge register.

#define PORT_8255_KEYB_STATUS	PORT_8255_BASE_ADDRESS+4	//Keyboard status register.

#define PORT_8255_KEYB_LED_CODE	0xED	//Keyboard LED register.

/************************************************
 *在setup.asm中，我们把硬件可屏蔽中断的起始号
 *定在0x20，8259A(PIC)
 ************************************************/
#define HW_IRQ_NR			16
#define HW_PIC_INTR_START	0x20
/************so, the following*******************/
#define HWM_TIMER_IRQ0		HW_PIC_INTR_START+0
#define HWM_KEYB_IRQ1		HW_PIC_INTR_START+1
#define HWM_SLAVE_IRQ2		HW_PIC_INTR_START+2
#define HWM_COM2_IRQ3		HW_PIC_INTR_START+3
#define HWM_COM1_IRQ4		HW_PIC_INTR_START+4
#define HWM_LPT2_IRQ5		HW_PIC_INTR_START+5
#define HWM_FLOPPY_IRQ6		HW_PIC_INTR_START+6
#define HWM_LPT1_IRQ7		HW_PIC_INTR_START+7
	/*******从片********************/
#define HWM_RTC_IRQ8		HW_PIC_INTR_START+8
#define HWM_PICMASTER_IRQ9	HW_PIC_INTR_START+9
#define HWM_RESERVED_IRQa	HW_PIC_INTR_START+0x0a
#define HWM_RESERVED_IRQb	HW_PIC_INTR_START+0x0b
#define HWM_PS2_IRQc		HW_PIC_INTR_START+0x0c
#define HWM_80x87_IRQd		HW_PIC_INTR_START+0x0d
#define HWM_IDE_CHN0_IRQe	HW_PIC_INTR_START+0x0e
#define HWM_IDE_CHN1_IRQf	HW_PIC_INTR_START+0x0f

/********允许8259A的主片的inr2(即允许从片中断)********/
//#define ENABLE_IRQ2 ucInPortDelay(PORT_8259A_MAJOR+1)&0xfd
#define ENABLE_IRQ2 ucInPortDelay(PORT_8259A_MAJOR+1)&~0x04
/***********允许IRQ0 ---timer0*******************/
#define ENABLE_IRQ0 ucInPortDelay(PORT_8259A_MAJOR+1)&~0x01
/***********允许IRQ1 ---keyb*********************/
#define ENABLE_IRQ1 ucInPortDelay(PORT_8259A_MAJOR+1)&~0x02
/**************允许IRQe ---ide*******************/
#define ENABLE_IRQe ucInPortDelay(PORT_8259A_MINOR+1)&~0x40



#endif /* end of __JCINX_INC_X86_H */