2 files changed, 66 insertions, 10 deletions

diff --git a/src/kernel/io/io.c b/src/kernel/io/io.c
index 30dcee2..dc2d59a 100644
--- a/src/kernel/io/io.c
+++ b/src/kernel/io/io.c
@@ -40,21 +40,65 @@ void init_serial() {
     send_b(0x3f8 + 3, 0x03);
     send_b(0x3f8 + 2, 0xC7);
     send_b(0x3f8 + 4, 0x0B);
-    write_serial("Installed serial connection!");
+    serial_write("Installed serial connection!\n");
 }
 
 int is_transmit_empty() {
     return receive_b(0x3f8 + 5) & 0x20;
 }
 
-void write_serial(char *data) {
+void serial_put(char ch) {
+    while (is_transmit_empty() == 0);
+    send_b(0x3f8, ch);
+}
+
+void serial_write(char *data) {
     for (size_t i = 0; i < strlen(data); i++) {
-        while (is_transmit_empty() == 0);
-        send_b(0x3f8, data[i]);
+        serial_put(data[i]);
+    }
+}
+
+void serial_write_hex(int n) {
+    int tmp;
+
+    serial_write("0x");
+    char noZeroes = 1;
+
+    for (int i = 28; i > 0; i -= 4) {
+        tmp = (n >> i) & 0xF;
+        if (tmp == 0 && noZeroes != 0) continue;
+
+        if (tmp >= 0xA) {
+            noZeroes = 0;
+            serial_put(tmp - 0xA + 'a');
+        } else {
+            noZeroes = 0;
+            serial_put(tmp + '0');
+        }
+    }
+
+    tmp = n & 0xF;
+    if (tmp >= 0xA) {
+        serial_put(tmp - 0xA + 'a');
+    } else {
+        serial_put(tmp + '0');
     }
-    char *linebreak = "\n";
-    for (size_t i = 0; i < strlen(linebreak); i++) {
-        while (is_transmit_empty() == 0);
-        send_b(0x3f8, linebreak[i]);
+}
+
+void serial_write_dec(int n) {
+    if (n == 0) serial_put('0');
+    int acc = n;
+    char c[32];
+    int i = 0;
+    while (acc > 0) {
+        c[i] = '0' + acc % 10;
+        acc /= 10;
+        i++;
     }
+    c[i] = 0;
+    static char c2[32];
+    c2[i--] = 0;
+    int j = 0;
+    while (i >= 0) c2[i--] = c[j++];
+    serial_write(c2);
 }
diff --git a/src/kernel/io/io.h b/src/kernel/io/io.h
index e72d794..a34bd21 100644
--- a/src/kernel/io/io.h
+++ b/src/kernel/io/io.h
@@ -52,8 +52,20 @@ void init_serial();
 
 /**
  * Write a string to the serial port (QEMU logging)
- * @param data
+ * @param data The string that should get transmitted
  */
-void write_serial(char *data);
+void serial_write(char *data);
+
+/**
+ * Write a hex number to the serial port (QEMU logging)
+ * @param n The hex number that should get transmitted
+ */
+void serial_write_hex(int n);
+
+/**
+ * Write a dec number to the serial port (QEMU logging)
+ * @param n The dec number that should get transmitted
+ */
+void serial_write_dec(int n);
 
 #endif