Add: IDT implementation without ISRs

idt.c

@@ -0,0 +1,42 @@
+#include "idt.h"
+#include "system.h"
+
+struct idt_entry
+{
+	unsigned short base_lo;
+	unsigned short sel;
+	unsigned char always0;
+	unsigned char flags;
+	unsigned short base_hi;
+} __attribute__((packed));
+
+struct idt_ptr
+{
+	unsigned short limit;
+	unsigned int base;
+} __attribute__((packed));
+
+struct idt_entry idt[256];
+struct idt_ptr idtp;
+
+extern void idt_load();
+
+void idt_set_gate(unsigned char num, unsigned long base, unsigned short sel, unsigned char flags)
+{
+	idt[num].base_lo = (base & 0xFFFF);
+	idt[num].base_hi = (base >> 16) & 0xFFFF;
+
+	idt[num].sel = sel;
+	idt[num].always0 = 0;
+	idt[num].flags = flags;
+}
+
+void idt_install()
+{
+	idtp.limit = (sizeof (struct idt_entry)*256) - 1;
+	idtp.base = (unsigned int)&idt;
+
+	memset(&idt, 0, sizeof(struct idt_entry)*256);
+
+	idt_load();
+}