194 lines
6.0 KiB
C
194 lines
6.0 KiB
C
#include "isr.h"
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#include "idt.h"
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#include "ports.h"
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#include "../halt.h"
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#include "../drivers/vga.h"
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#include "../tasking.h"
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#include <string.h>
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#include <stdint.h>
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void irq_handler(registers_t r);
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isr_t interrupt_handlers[256];
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/* Can't do this with a loop because we need the address
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* of the function names */
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void isr_install() {
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set_idt_gate(0,(uint32_t)isr0);
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set_idt_gate(1,(uint32_t)isr1);
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set_idt_gate(2,(uint32_t)isr2);
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set_idt_gate(3,(uint32_t)isr3);
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set_idt_gate(4,(uint32_t)isr4);
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set_idt_gate(5,(uint32_t)isr5);
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set_idt_gate(6,(uint32_t)isr6);
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set_idt_gate(7,(uint32_t)isr7);
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set_idt_gate(8,(uint32_t)isr8);
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set_idt_gate(9,(uint32_t)isr9);
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set_idt_gate(10,(uint32_t)isr10);
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set_idt_gate(11,(uint32_t)isr11);
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set_idt_gate(12,(uint32_t)isr12);
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set_idt_gate(13,(uint32_t)isr13);
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set_idt_gate(14,(uint32_t)isr14);
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set_idt_gate(15,(uint32_t)isr15);
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set_idt_gate(16,(uint32_t)isr16);
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set_idt_gate(17,(uint32_t)isr17);
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set_idt_gate(18,(uint32_t)isr18);
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set_idt_gate(19,(uint32_t)isr19);
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set_idt_gate(20,(uint32_t)isr20);
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set_idt_gate(21,(uint32_t)isr21);
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set_idt_gate(22,(uint32_t)isr22);
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set_idt_gate(23,(uint32_t)isr23);
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set_idt_gate(24,(uint32_t)isr24);
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set_idt_gate(25,(uint32_t)isr25);
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set_idt_gate(26,(uint32_t)isr26);
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set_idt_gate(27,(uint32_t)isr27);
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set_idt_gate(28,(uint32_t)isr28);
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set_idt_gate(29,(uint32_t)isr29);
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set_idt_gate(30,(uint32_t)isr30);
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set_idt_gate(31,(uint32_t)isr31);
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set_idt_gate(80,(uint32_t)isr80);
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// Remap the PIC
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port_byte_out(0x20,0x11);
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port_byte_out(0xA0,0x11);
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port_byte_out(0x21,0x20);
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port_byte_out(0xA1,0x28);
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port_byte_out(0x21,0x04);
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port_byte_out(0xA1,0x02);
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port_byte_out(0x21,0x01);
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port_byte_out(0xA1,0x01);
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port_byte_out(0x21,0x0);
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port_byte_out(0xA1,0x0);
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// Install the IRQs
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set_idt_gate(32,(uint32_t)irq0);
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set_idt_gate(33,(uint32_t)irq1);
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set_idt_gate(34,(uint32_t)irq2);
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set_idt_gate(35,(uint32_t)irq3);
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set_idt_gate(36,(uint32_t)irq4);
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set_idt_gate(37,(uint32_t)irq5);
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set_idt_gate(38,(uint32_t)irq6);
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set_idt_gate(39,(uint32_t)irq7);
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set_idt_gate(40,(uint32_t)irq8);
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set_idt_gate(41,(uint32_t)irq9);
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set_idt_gate(42,(uint32_t)irq10);
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set_idt_gate(43,(uint32_t)irq11);
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set_idt_gate(44,(uint32_t)irq12);
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set_idt_gate(45,(uint32_t)irq13);
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set_idt_gate(46,(uint32_t)irq14);
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set_idt_gate(47,(uint32_t)irq15);
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set_idt(); // Load with ASM
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}
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/* To print the message which defines every exception */
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char *exception_messages[] = {
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"Division By Zero",
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"Debug",
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"Non Maskable Interrupt",
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"Breakpoint",
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"Into Detected Overflow",
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"Out of Bounds",
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"Invalid Opcode",
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"No Coprocessor",
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"Double Fault",
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"Coprocessor Segment Overrun",
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"Bad TSS",
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"Segment Not Present",
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"Stack Fault",
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"General Protection Fault",
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"Page Fault",
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"Unknown Interrupt",
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"Coprocessor Fault",
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"Alignment Check",
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"Machine Check",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved"
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};
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void isr_handler(registers_t r) {
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switch (r.int_no) {
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case 14: {
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uint32_t addr;
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asm("movl %%cr2,%0": "=r"(addr));
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if (r.err_code==0) {
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vga_write_string("Kernel process tried to read a non-present page entry at address ");
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} else if (r.err_code==1) {
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vga_write_string("Kernel process tried to read a page and caused a protection fault at address ");
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} else if (r.err_code==2) {
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vga_write_string("Kernel process tried to write to a non-present page entry at address ");
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} else if (r.err_code==3) {
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vga_write_string("Kernel process tried to write a page and caused a protection fault at address ");
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} else if (r.err_code==4) {
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vga_write_string("User process tried to read a non-present page entry at address ");
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} else if (r.err_code==5) {
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vga_write_string("User process tried to read a page and caused a protection fault at address ");
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} else if (r.err_code==6) {
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vga_write_string("User process tried to write to a non-present page entry at address ");
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} else if (r.err_code==7) {
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vga_write_string("User process tried to write a page and caused a protection fault at address ");
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}
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char str[11];
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str[0]='\0';
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hex_to_ascii(addr,str);
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vga_write_string(str);
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vga_write_string("\n");
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// if ((r.err_code&1)==0) {
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// // int dir_entry=(addr&0xFFC00000)>>22;
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// // int table_entry=(addr&0x3FF000)>12;
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// // if (dir_entry_present(dir_entry)) {
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// // set_table_entry(dir_entry,table_entry,((dir_entry*1024)+table_entry)*0x1000,1,1,1);
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// // for(int page=0;page<1024;page++) {
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// // asm volatile("invlpg (%0)"::"r"(((dir_entry*1024)+page)*0x1000):"memory");
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// // }
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// // } else {
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// // for(int page=0;page<1024;page++) {
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// // set_table_entry(dir_entry,page,0x0,1,1,0);
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// // }
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// // set_table_entry(dir_entry,table_entry,((dir_entry*1024)+table_entry)*0x1000,1,1,1);
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// // set_directory_entry(dir_entry,dir_entry,1,1,1);
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// // }
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// // return;
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// }
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halt();
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break;
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case 80:
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if (r.eax==1) {
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tasking_yield();
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} else if (r.eax==2) {
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tasking_createTask((void*)r.ebx);
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}
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break;
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}
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}
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}
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void register_interrupt_handler(uint8_t n,isr_t handler) {
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interrupt_handlers[n] = handler;
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}
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void irq_handler(registers_t r) {
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/* After every interrupt we need to send an EOI to the PICs
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* or they will not send another interrupt again */
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if (r.int_no >= 40) port_byte_out(0xA0,0x20); /* slave */
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port_byte_out(0x20,0x20); /* master */
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/* Handle the interrupt in a more modular way */
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if (interrupt_handlers[r.int_no] != 0) {
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isr_t handler = interrupt_handlers[r.int_no];
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handler(r);
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}
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}
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