kernel: x86-64 idt

kernel-src/arch/x86-64/idt.c

@@ -0,0 +1,41 @@
+#include <arch/idt.h>
+#include <stdint.h>
+#include <stddef.h>
+
+typedef struct {
+	uint16_t size;
+	uint64_t offset;
+} __attribute__((packed)) idtr_t;
+
+typedef struct {
+	uint16_t offset;
+	uint16_t segment;
+	uint8_t ist;
+	uint8_t flags;
+	uint16_t offset2;
+	uint32_t offset3;
+} __attribute__((packed)) idtentry_t;
+
+static idtentry_t idt[256];
+
+static idtr_t idtr = {
+	.size = sizeof(idt) - 1,
+	.offset = (uint64_t)idt
+};
+
+extern const uint64_t isr_table[256];
+
+void arch_idt_setup() {
+	for (int i = 0; i < 256; ++i) {
+		idt[i].offset = isr_table[i] & 0xffff;
+		idt[i].segment = 0x8;
+		idt[i].ist = 0;
+		idt[i].flags = 0x8e;
+		idt[i].offset2 = (isr_table[i] >> 16) & 0xffff;
+		idt[i].offset3 = (isr_table[i] >> 32) & 0xffffffff;
+	}
+}
+
+void arch_idt_reload() {
+	asm volatile("lidt (%%rax)" : : "a"(&idtr));
+}