Assignment 3 (only src and notes)

src/OSDev_18/include/kernel/io.h

@@ -0,0 +1,20 @@
+#ifndef KERNEL_IO_H
+#define KERNEL_IO_H
+
+#include <libc/stdint.h>
+
+static inline void OutPortByte(uint16_t port, uint8_t val) {
+    __asm__ volatile ("outb %0, %1" : : "a"(val), "Nd"(port));
+}
+
+static inline uint8_t InPortByte(uint16_t port) {
+    uint8_t ret;
+    __asm__ volatile ("inb %1, %0" : "=a"(ret) : "Nd"(port));
+    return ret;
+}
+
+static inline void IoWait(void) {
+    __asm__ volatile ("outb %%al, $0x80" : : "a"(0));
+}
+
+#endif