Add stupid first serial output

2018-04-23 10:22:02 -07:00
parent 1113164505
commit ef24894211
3 changed files with 50 additions and 0 deletions
--- a/src/kernel/io.cpp
+++ b/src/kernel/io.cpp
@@ -0,0 +1,16 @@
+#include "io.h"
+
+uint8_t
+inb(uint16_t port)
+{
+	uint8_t val;
+	__asm__ __volatile__ ( "inb %1, %0" : "=a"(val) : "Nd"(port) );
+	return val;
+}
+
+void
+outb(uint16_t port, uint8_t val)
+{
+	__asm__ __volatile__ ( "outb %0, %1" :: "a"(val), "Nd"(port) );
+}
+