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https://github.com/DragonOS-Community/DragonOS.git
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66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
#include "8259A.h"
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#include "../../../common/printk.h"
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#include "../../../common/kprint.h"
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#include "../../../exception/gate.h"
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// 导出定义在irq.c中的中段门表
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extern void (*interrupt_table[24])(void);
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void init_8259A()
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{
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// 初始化中断门， 中断使用第二个ist
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for(int i=32;i<=55;++i)
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set_intr_gate(i, 2, interrupt_table[i-32]);
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kinfo("Initializing 8259A...");
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// 初始化主芯片
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io_out8(0x20, 0x11); // 初始化主芯片的icw1
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io_out8(0x21, 0x20); // 设置主芯片的中断向量号为0x20(0x20-0x27)
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io_out8(0x21, 0x04); // 设置int2端口级联从芯片
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io_out8(0x21, 0x01); // 设置为AEOI模式、FNM、无缓冲
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// 初始化从芯片
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io_out8(0xa0, 0x11);
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io_out8(0xa1, 0x28); // 设置从芯片的中断向量号为0x28(0x28-0x2f)
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io_out8(0xa1, 0x02); // 设置从芯片连接到主芯片的int2
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io_out8(0xa1, 0x01);
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// 设置ocw1, 允许所有中断请求
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io_out8(0x21, 0x00);
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io_out8(0xa1, 0x00);
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sti();
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kinfo("IRQ circuit 8259A initialized.");
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}
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/**
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* @brief 中断服务程序
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*
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* @param rsp 中断栈指针
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* @param number 中断号
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*/
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void do_IRQ(struct pt_regs *regs, ul number)
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{
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unsigned char x;
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switch (number)
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{
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case 0x20: // 时钟中断信号
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break;
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case 0x21: // 键盘中断
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x = io_in8(0x60);
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printk_color(ORANGE, BLACK, "Received key irq, key code:%#018lx\n", x);
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break;
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default:
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break;
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}
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if(number!=0x20)
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printk_color(ORANGE, BLACK, "Received irq:%#018x\n", number);
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// 向主芯片发送中断结束信号
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io_out8(PIC_master, PIC_EOI);
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} |