initial

1 files changed, 108 insertions, 0 deletions

diff --git a/kernel/src/interrupt/idt.c b/kernel/src/interrupt/idt.c
new file mode 100644
index 0000000..6df3793
--- /dev/null
+++ b/kernel/src/interrupt/idt.c
@@ -0,0 +1,108 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <sys.h>
+#include <print.h>
+#include <panic.h>
+
+#include "acpi/acpi.h"
+#include "drivers/ps2kb.h"
+#include "drivers/ps2mouse.h"
+#include "tty/color.h"
+#include "idt.h"
+#include "pic.h"
+#include "tty/term.h"
+
+static int timer = 0;
+
+void idt_pic_eoi(uint8_t exception) {
+	pic_eoi(exception - PIC_REMAP_OFFSET);
+}
+
+void idt_pic_timer(void) {
+	uint32_t state = term_save();
+	term_setfg(VGA_LIGHT_GREEN);
+	term_setpos(60, 0);
+	puts("        ");
+	term_setpos(60, 0);
+	printk("%d", timer);
+	timer += 1;
+	term_load(state);
+}
+
+void idt_pic_keyboard(void) {
+	ps2kb_recv();
+}
+
+void idt_pic_mouse(void) {
+	ps2mouse_recv();
+}
+
+void idt_exception_handler(uint8_t exception) {
+	char* msg;
+	switch(exception) {
+		case 0x00:
+			msg = "Division by zero";
+			break;
+		case 0x02:
+			msg = "NMI";
+			break;
+		case 0x04:
+			msg = "Overflow";
+			break;
+		case 0x06:
+			msg = "invalid opcode";
+			break;
+		case 0x08:
+			msg = "double fault";
+			break;
+		case 0x0A:
+			msg = "invalid task state segment";
+			break;
+		case 0x0C:
+			msg = "stack segment fault";
+			break;
+		case 0x0D:
+			msg = "general protection fault";
+			break;
+		case 0x0E:
+			msg = "page fault";
+			break;
+		default:
+			msg = "unknown exception";
+			break;
+	}
+	panic("E%u: %s", exception, msg);
+}
+
+__attribute__((aligned(0x10)))
+static struct IdtEntry idt[256];
+static struct Idtr idtr;
+extern void* isr_stub_table[];
+
+static void set_descriptor(uint8_t vector, void* isr, uint8_t flags) {
+	struct IdtEntry* entry = &idt[vector];
+	entry->isr_low = (size_t)isr & 0xffff;
+	entry->kernel_cs = 0x08;
+	entry->attributes = flags;
+	entry->isr_high = (size_t)isr >> 16;
+	entry->_reserved = 0;
+}
+
+void idt_init(void) {
+
+    debugk("Loading IDT");
+
+	idtr.base = (uintptr_t)&idt[0];
+	idtr.limit = (uint16_t)sizeof(struct IdtEntry) * IDT_SIZE - 1;
+
+	for(int i = 0; i < IDT_INTERRUPTS; i++) {
+		set_descriptor(i, isr_stub_table[i], 0x8e);
+	}
+
+	__asm__ volatile ("lidt %0" : : "m"(idtr));
+
+    succek("IDT has been loaded");
+}
+