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230
src/hal/idt.c
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230
src/hal/idt.c
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#include "idt.h"
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#include "error.h"
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#include "timer.h"
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#include <stdio.h>
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#include <lock.h>
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#include <SFB25.h>
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idt_descriptor idt[256] = {0};
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idt_register idtr = {sizeof(idt)-1, (uint64_t)(&idt)};
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/* Expand if needed */
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#define MAX_IRQ 256
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/* IRQ structure list, eventually restructure to support IRQs on multiple cores */
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irq_t irq_list[MAX_IRQ] = {0};
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extern void s_isr0();
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extern void s_isr1();
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extern void s_isr2();
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extern void s_isr3();
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extern void s_isr4();
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extern void s_isr5();
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extern void s_isr6();
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extern void s_isr7();
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extern void s_isr8();
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extern void s_isr9();
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extern void s_isr10();
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extern void s_isr11();
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extern void s_isr12();
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extern void s_isr13();
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extern void s_isr14();
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extern void s_isr15();
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extern void s_isr16();
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extern void s_isr17();
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extern void s_isr18();
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extern void s_isr19();
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extern void s_isr20();
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extern void s_isr21();
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extern void s_isr22();
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extern void s_isr23();
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extern void s_isr24();
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extern void s_isr25();
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extern void s_isr26();
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extern void s_isr27();
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extern void s_isr28();
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extern void s_isr29();
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extern void s_isr30();
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extern void s_isr31();
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extern void s_isr44();
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extern void s_isr69();
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extern void s_isr70();
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extern void s_isr255();
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extern void s_load_idt();
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atomic_flag irq_register_lock = ATOMIC_FLAG_INIT;
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/* Registers an IRQ with the specified vector. */
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kstatus register_irq_vector(uint8_t vector, void *base, uint8_t flags){
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acquire_lock(&irq_register_lock);
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if(!irq_list[vector].in_use){
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free_lock(&irq_register_lock);
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return KERNEL_STATUS_ERROR;
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}
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set_idt_descriptor(vector, base, flags);
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irq_list[vector].base = base;
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irq_list[vector].in_use = true;
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s_load_idt();
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free_lock(&irq_register_lock);
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return KERNEL_STATUS_SUCCESS;
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}
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/* Registers an IRQ and returns the vector */
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int register_irq(void *base, uint8_t flags){
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acquire_lock(&irq_register_lock);
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for(size_t i = 0; i < MAX_IRQ; i++){
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if(!irq_list[i].in_use) {
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set_idt_descriptor(i, base, flags);
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irq_list[i].base = base;
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irq_list[i].in_use = true;
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free_lock(&irq_register_lock);
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s_load_idt();
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return i;
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}
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}
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free_lock(&irq_register_lock);
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return -1;
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}
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void set_idt_descriptor(uint8_t vector, void *base, uint8_t flags){
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idt[vector].offset_low = ((uint64_t)base & 0xffff);
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idt[vector].segment_sel = 0x08; // kernel code segment
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idt[vector].ist = 0;
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idt[vector].attributes = flags;
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idt[vector].offset_high = ((uint64_t)base >> 16) & 0xffff;
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idt[vector].offset_higher = ((uint64_t)base >> 32) & 0xffffffff;
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idt[vector].reserved = 0;
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}
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void set_idt(void){
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/* Set all the reserved vectors as used */
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for(size_t i = 0; i < 32; i++){
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irq_list[i].in_use = true;
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irq_list[i].base = NULL;
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}
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set_idt_descriptor(0, s_isr0, 0x8E);
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set_idt_descriptor(1, s_isr1, 0x8E);
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set_idt_descriptor(2, s_isr2, 0x8E);
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set_idt_descriptor(3, s_isr3, 0x8E);
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set_idt_descriptor(4, s_isr4, 0x8E);
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set_idt_descriptor(5, s_isr5, 0x8E);
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set_idt_descriptor(6, s_isr6, 0x8E);
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set_idt_descriptor(7, s_isr7, 0x8E);
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set_idt_descriptor(8, s_isr8, 0x8E);
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set_idt_descriptor(9, s_isr9, 0x8E);
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set_idt_descriptor(10, s_isr10, 0x8E);
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set_idt_descriptor(11, s_isr11, 0x8E);
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set_idt_descriptor(12, s_isr12, 0x8E);
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set_idt_descriptor(13, s_isr13, 0x8E);
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set_idt_descriptor(14, s_isr14, 0x8E);
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set_idt_descriptor(15, s_isr15, 0x8E);
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set_idt_descriptor(16, s_isr16, 0x8E);
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set_idt_descriptor(17, s_isr17, 0x8E);
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set_idt_descriptor(18, s_isr18, 0x8E);
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set_idt_descriptor(19, s_isr19, 0x8E);
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set_idt_descriptor(20, s_isr20, 0x8E);
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set_idt_descriptor(21, s_isr21, 0x8E);
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set_idt_descriptor(22, s_isr22, 0x8E);
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set_idt_descriptor(23, s_isr23, 0x8E);
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set_idt_descriptor(24, s_isr24, 0x8E);
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set_idt_descriptor(25, s_isr25, 0x8E);
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set_idt_descriptor(26, s_isr26, 0x8E);
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set_idt_descriptor(27, s_isr27, 0x8E);
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set_idt_descriptor(28, s_isr28, 0x8E);
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set_idt_descriptor(29, s_isr29, 0x8E);
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set_idt_descriptor(30, s_isr30, 0x8E);
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set_idt_descriptor(31, s_isr31, 0x8E);
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set_idt_descriptor(44, 0, 0x8E);
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set_idt_descriptor(69, s_isr69, 0x8E);
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set_idt_descriptor(70, s_isr70, 0x8E);
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set_idt_descriptor(255, s_isr255, 0x8E);
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s_load_idt();
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}
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char *exception_messages[] =
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{
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"Division Error",
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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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"Device not available",
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"Double Fault",
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"Coprocessor Segment Overrun",
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"Invalid 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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"x87 FPU Floating-point error",
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"Alignment Check",
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"Machine Check",
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"SIMD Floating-point exception",
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"Virtualization exception",
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"Control Protection",
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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 interrupt_handler(interrupt_frame *r){
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if(r->int_no < 32){
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kprintf("\nOh no! Received interrupt {d}, '{s}'. Below is the provided stack frame{n}{n}", r->int_no, exception_messages[r->int_no]);
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kprintf("error code 0x{xn}", r->err);
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kprintf("rax 0x{x} | rbx 0x{x} | rcx 0x{x} | rdx 0x{xn}", r->rax, r->rbx, r->rcx, r->rdx);
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kprintf("rdi 0x{x} | rsi 0x{x} | rbp 0x{xn}", r->rdi, r->rsi, r->rbp);
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kprintf("r8 0x{x} | r9 0x{x} | r10 0x{x} | r11 0x{x} | r12 0x{x} | r13 0x{x} | r14 0x{x} | r15 0x{xn}", r->r8, r->r9, r->r10, r->r11, r->r12, r->r13, r->r14, r->r15);
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kprintf("rip 0x{x} | cs 0x{x} | ss 0x{x} | rsp 0x{x} | rflags 0x{xn}", r->rip, r->cs, r->ss, r->rsp, r->rflags);
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kkill();
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for(;;);
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}
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if(r->int_no == 255){
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kprintf("hey");
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}
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if(r->int_no == 69){
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apic_timer_handler();
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}
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if(r->int_no == 70){
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for(;;){
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asm("cli;hlt");
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}
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}
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return;
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}
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