110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
#include "assert.h"
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#include "process.h"
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#include "stdio.h"
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#include "time.h"
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#include "trap.h"
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#include "x86.h"
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/*
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* 当前内核需要处理中断的数量
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*/
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int k_reenter;
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void (*irq_table[16])(int) = {
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clock_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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default_interrupt_handler,
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};
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/*
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* 开启对应外设中断（将掩码对应位置为0）
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*/
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void
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enable_irq(int irq)
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{
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u8 mask = 1 << (irq % 8);
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if (irq < 8)
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outb(INT_M_CTLMASK, inb(INT_M_CTLMASK) & ~mask);
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else
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outb(INT_S_CTLMASK, inb(INT_S_CTLMASK) & ~mask);
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}
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/*
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* 关闭对应外设中断（将掩码对应位置为1）
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*/
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void
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disable_irq(int irq)
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{
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u8 mask = 1 << (irq % 8);
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if (irq < 8)
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outb(INT_M_CTLMASK, inb(INT_M_CTLMASK) | mask);
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else
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outb(INT_S_CTLMASK, inb(INT_S_CTLMASK) | mask);
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}
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/*
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* 中断默认处理函数
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* 理论上是不支持的，所以会给个warning
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*/
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void
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default_interrupt_handler(int irq)
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{
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warn("unsupport interrupt! irq = %d", irq);
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}
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/*
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* 异常默认处理函数
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* 由于没有任何处理异常的手段，所以会给个panic
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*/
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void
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exception_handler(int vec_no, int err_code, int eip, int cs, int eflags)
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{
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char err_description[][64] = { "#DE Divide Error",
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"#DB RESERVED",
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"— NMI Interrupt",
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"#BP Breakpoint",
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"#OF Overflow",
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"#BR BOUND Range Exceeded",
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"#UD Invalid Opcode (Undefined Opcode)",
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"#NM Device Not Available (No Math Coprocessor)",
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"#DF Double Fault",
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" Coprocessor Segment Overrun (reserved)",
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"#TS Invalid TSS",
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"#NP Segment Not Present",
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"#SS Stack-Segment Fault",
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"#GP General Protection",
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"#PF Page Fault",
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"— (Intel reserved. Do not use.)",
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"#MF x87 FPU Floating-Point Error (Math Fault)",
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"#AC Alignment Check",
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"#MC Machine Check",
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"#XF SIMD Floating-Point Exception"
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};
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panic("\x1b[H\x1b[2JException! --> %s\nEFLAGS: %x CS: %x EIP: %x\nError code: %x",
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err_description[vec_no], eflags, cs, eip, err_code);
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}
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/*
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* 时钟中断处理函数
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*/
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void
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clock_interrupt_handler(int irq)
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{
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kprintf("#");
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timecounter_inc();
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p_proc_ready++;
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if (p_proc_ready >= proc_table + PCB_SIZE) {
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p_proc_ready = proc_table;
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}
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} |