1 files changed, 42 insertions, 0 deletions
diff --git a/kernel/arch/x86/kernel/serial.c b/kernel/arch/x86/kernel/serial.c
new file mode 100644
index 0000000..dc2a8bd
--- /dev/null
+++ b/kernel/arch/x86/kernel/serial.c
@@ -0,0 +1,42 @@
+#include <kernel/serial.h>
+#include <kernel/pic.h>
+#include <libk/string.h>
+#include <stddef.h>
+
+#define PORT 0x3f8
+
+static inline int _serial_received(void) {
+        return inb(PORT + 5) & 1;
+}
+
+static inline int _is_transmit_empty(void) {
+        return inb(PORT + 5) & 0x20;
+}
+
+int serial_init(void) {
+        outb(PORT + 1, 0x00);
+        outb(PORT + 3, 0x80);
+        outb(PORT + 0, 0x03);
+        outb(PORT + 1, 0x00);
+        outb(PORT + 3, 0x03);
+        outb(PORT + 2, 0xC7);
+        outb(PORT + 4, 0x0B);
+        outb(PORT + 4, 0x1E);
+        outb(PORT + 0, 0xAE);
+
+        if (inb(PORT + 0) != 0xAE)
+                return -1;
+
+        outb(PORT + 4, 0x0F);
+        return 0;
+}
+
+void serial_putchar(char c) {
+        while (_is_transmit_empty() == 0);
+        outb(PORT, c);
+}
+
+char serial_getchar(void) {
+        while (_serial_received() == 0);
+        return inb(PORT);
+}