first commit

kernel/src/sys/arch/x86_64/rtc.c

@@ -0,0 +1,25 @@
+#include "sys/arch/x86_64/idt.h"
+#include "sys/arch/x86_64/io.h"
+#include <sys/arch/x86_64/rtc.h>
+#include <sys/arch/x86_64/pic.h>
+#include <sys/printf.h>
+
+void rtc_init() {
+    asm("cli");
+    outb(0x70, 0x8A);
+    outb(0x71, 0x20);
+    asm("sti");
+
+    asm("cli");			// disable interrupts
+    outb(0x70, 0x8B);		// select register B, and disable NMI
+    char prev=inb(0x71);	// read the current value of register B
+    outb(0x70, 0x8B);		// set the index again (a read will reset the index to register D)
+    outb(0x71, prev | 0x40);	// write the previous value ORed with 0x40. This turns on bit 6 of register B
+    asm("sti");
+
+    //pic_unmask_irq(8);
+}
+
+void rtc_handle_interrupt(registers_t *regs) {
+    printf("RTC!\n");
+}