mirror of
https://github.com/JannisHeydemann/BoredOS.git
synced 2026-05-30 02:16:58 +00:00
4c21e732fc
BrewOS 1.31 > BrewOS 1.40 Brewkernel 2.3.0 Alpha > Brewkernel 2.3.1 Beta This update is a feature focused update. It features loads of quality of life and major UX improvements. New features: -Drag and drop for files and applications (shortcuts for apps can be made by dragging an app from the start menu into the desktop) -Customizable desktop (auto align, snap to grid -Recycle bin (rm in the CMD skips this)
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
#include "idt.h"
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#include "io.h"
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#define IDT_ENTRIES 256
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struct idt_entry {
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uint16_t isr_low;
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uint16_t kernel_cs;
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uint8_t ist;
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uint8_t attributes;
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uint16_t isr_mid;
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uint32_t isr_high;
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uint32_t reserved;
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} __attribute__((packed));
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struct idt_ptr {
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uint16_t limit;
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uint64_t base;
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} __attribute__((packed));
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static struct idt_entry idt[IDT_ENTRIES];
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static struct idt_ptr idtr;
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void idt_set_gate(uint8_t vector, void *isr, uint16_t cs, uint8_t flags) {
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uint64_t addr = (uint64_t)isr;
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idt[vector].isr_low = addr & 0xFFFF;
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idt[vector].kernel_cs = cs;
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idt[vector].ist = 0;
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idt[vector].attributes = flags;
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idt[vector].isr_mid = (addr >> 16) & 0xFFFF;
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idt[vector].isr_high = (addr >> 32) & 0xFFFFFFFF;
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idt[vector].reserved = 0;
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}
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// Remap PIC
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static void pic_remap(void) {
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uint8_t a1, a2;
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a1 = inb(0x21);
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a2 = inb(0xA1);
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outb(0x20, 0x11); io_wait();
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outb(0xA0, 0x11); io_wait();
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outb(0x21, 0x20); io_wait(); // Master offset 0x20 (32)
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outb(0xA1, 0x28); io_wait(); // Slave offset 0x28 (40)
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outb(0x21, 0x04); io_wait();
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outb(0xA1, 0x02); io_wait();
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outb(0x21, 0x01); io_wait();
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outb(0xA1, 0x01); io_wait();
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// 0xEF = 1110 1111 (IRQ 12 (4 on slave) unmasked)
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outb(0x21, 0xF9); // Unmask Keyboard (IRQ1) and Cascade (IRQ2)
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outb(0xA1, 0xEF); // Unmask Mouse (IRQ12)
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}
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// Set up PIT (Programmable Interval Timer) for ~60Hz (16.67ms intervals)
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static void pit_setup(void) {
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uint16_t divisor = 1193182 / 60; // ~60Hz
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// Send command byte
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outb(0x43, 0x36); // Channel 0, lobyte/hibyte, mode 3 (square wave), binary
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// Send divisor
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outb(0x40, divisor & 0xFF);
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outb(0x40, (divisor >> 8) & 0xFF);
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}
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void idt_init(void) {
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uint16_t cs;
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asm volatile ("mov %%cs, %0" : "=r"(cs));
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for (int i = 0; i < IDT_ENTRIES; i++) {
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idt[i] = (struct idt_entry){0};
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}
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pic_remap();
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// Unmask IRQ 0 (Timer) in addition to IRQ 1 and 12
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outb(0x21, 0xF8); // Unmask Timer (IRQ0), Keyboard (IRQ1) and Cascade (IRQ2)
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outb(0xA1, 0xEF); // Unmask Mouse (IRQ12)
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pit_setup();
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}
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void idt_register_interrupts(void) {
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uint16_t cs;
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asm volatile ("mov %%cs, %0" : "=r"(cs));
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idt_set_gate(32, isr0_wrapper, cs, 0x8E); // Timer (IRQ 0)
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idt_set_gate(33, isr1_wrapper, cs, 0x8E); // Keyboard (IRQ 1)
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idt_set_gate(44, isr12_wrapper, cs, 0x8E); // Mouse (IRQ 12)
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}
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void idt_load(void) {
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idtr.base = (uint64_t)&idt;
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idtr.limit = sizeof(struct idt_entry) * IDT_ENTRIES - 1;
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asm volatile ("lidt %0" : : "m"(idtr));
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asm volatile ("sti");
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}
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