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//! Interrupt Descriptor Table
const cpu = @import("../asm/cpu.zig");
const gdt_const = @import("../common/constants/gdt.zig");
const idt_const = @import("../common/constants/idt.zig");
const isr = @import("../asm/isr.zig");
const pic = @import("pic.zig");
const serial = @import("../drivers/serial/serial.zig");
const types = @import("types.zig");
comptime {
_ = @import("../crimson/exception.zig");
_ = @import("handlers.zig");
}
var table: [idt_const.NUM_ENTRIES]types.Entry align(16) = [_]types.Entry{.{
.offset_low = 0,
.selector = 0,
.ist = 0,
.type_attr = 0,
.offset_mid = 0,
.offset_high = 0,
.reserved = 0,
}} ** idt_const.NUM_ENTRIES;
var pointer: types.Pointer = undefined;
pub fn init() void {
serial.print("\n=== IDT ===\n");
for (0..idt_const.NUM_EXCEPTIONS) |i| {
const handler_addr = @intFromPtr(isr.get_exception_handler(@intCast(i)));
// Use IST1 for double fault (8) and page fault (14)
if (i == 8 or i == 14) {
set_gate_with_ist(@intCast(i), handler_addr, gdt_const.KERNEL_CODE, idt_const.GATE_INTERRUPT, 1);
} else {
set_gate(@intCast(i), handler_addr, gdt_const.KERNEL_CODE, idt_const.GATE_INTERRUPT);
}
}
set_gate(idt_const.VECTOR_TIMER, @intFromPtr(isr.get_irq_handler(0)), gdt_const.KERNEL_CODE, idt_const.GATE_INTERRUPT);
set_gate(idt_const.VECTOR_KEYBOARD, @intFromPtr(isr.get_irq_handler(1)), gdt_const.KERNEL_CODE, idt_const.GATE_INTERRUPT);
pointer = types.Pointer{
.limit = @sizeOf(@TypeOf(table)) - 1,
.base = @intFromPtr(&table),
};
cpu.load_interrupt_descriptor_table(@intFromPtr(&pointer));
pic.remap();
cpu.enable_interrupts();
serial.print("IDT loaded\n");
}
fn set_gate(num: u8, handler: u64, selector: u16, type_attr: u8) void {
set_gate_with_ist(num, handler, selector, type_attr, 0);
}
fn set_gate_with_ist(num: u8, handler: u64, selector: u16, type_attr: u8, ist: u8) void {
table[num] = types.Entry{
.offset_low = @truncate(handler & 0xFFFF),
.selector = selector,
.ist = ist,
.type_attr = type_attr,
.offset_mid = @truncate((handler >> 16) & 0xFFFF),
.offset_high = @truncate(handler >> 32),
.reserved = 0,
};
}
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