Implemented serial console debugging

Still trying to fix the EDID table

1 files changed, 22 insertions, 0 deletions

diff --git a/src/kernel/io/io.c b/src/kernel/io/io.c
index 74776ee..7cb364c 100644
--- a/src/kernel/io/io.c
+++ b/src/kernel/io/io.c
@@ -1,4 +1,5 @@
 #include <stdint.h>
+#include "../lib/lib.h"
 
 uint8_t receive_b(uint16_t port) {
     unsigned char value;
@@ -29,3 +30,24 @@ void send_w(uint16_t port, uint16_t data) {
 void send_l(uint16_t port, uint32_t data) {
     asm volatile ("outl %0, %1"::"a" (data), "Nd"(port));
 }
+
+void init_serial() {
+    send_b(0x3f8 + 1, 0x00);
+    send_b(0x3f8 + 3, 0x80);
+    send_b(0x3f8 + 0, 0x03);
+    send_b(0x3f8 + 1, 0x00);
+    send_b(0x3f8 + 3, 0x03);
+    send_b(0x3f8 + 2, 0xC7);
+    send_b(0x3f8 + 4, 0x0B);
+}
+
+int is_transmit_empty() {
+    return receive_b(0x3f8 + 5) & 0x20;
+}
+
+void write_serial(char *data) {
+    for (size_t i = 0; i < strlen(data); i++) {
+        while (is_transmit_empty() == 0);
+        send_b(0x3f8, data[i]);
+    }
+}