1 files changed, 21 insertions, 0 deletions
diff --git a/src/port.c b/src/port.c
new file mode 100644
index 0000000..2a19315
--- /dev/null
+++ b/src/port.c
@@ -0,0 +1,21 @@
+#include "port.h"
+
+uint8_t port_byte_in (uint8_t port) {
+    uint8_t result;
+    __asm__("in %%dx, %%al" : "=a" (result) : "d" (port));
+    return result;
+}
+
+void port_byte_out(uint8_t port, uint8_t data) {
+    __asm__("out %%al, %%dx" : :"a" (data), "d" (port));
+}
+
+uint16_t port_word_in (uint16_t port) {
+    uint16_t result;
+    __asm__("in %%dx, %%ax" : "=a" (result) : "d" (port));
+    return result;
+}
+
+void port_word_out (uint16_t port, uint16_t data) {
+    __asm__("out %%ax, %%dx" : :"a" (data), "d" (port));
+}