first real commit

1 files changed, 19 insertions, 0 deletions

diff --git a/kernel/io.c b/kernel/io.c
new file mode 100644
index 0000000..9b56b5d
--- /dev/null
+++ b/kernel/io.c
@@ -0,0 +1,19 @@
+#include <stdint.h>
+#include "io.h"
+
+void outb(uint16_t port, uint8_t val)
+{
+    asm volatile ("outb %1, %0": :"dN" (port), "a" (val));
+}
+uint8_t inb(uint16_t port)
+{
+    uint8_t ret;
+    asm volatile ("inb %1, %0" : "=a" (ret) : "dN" (port));
+    return ret;
+}
+uint16_t inw(uint16_t port)
+{
+    uint16_t ret;
+    asm volatile ("inw %1, %0" : "=a" (ret) : "dN" (port));
+    return ret;
+}