serial: add serial_writestring as a function

Add a function in the serial interface that writes an entire string to
the serial line.

Signed-off-by: Danny Holman <dholman@gymli.xyz>

1 files changed, 1 insertions, 0 deletions

diff --git a/kernel/init.c b/kernel/init.c
index b808122..a7a71d6 100644
--- a/kernel/init.c
+++ b/kernel/init.c
@@ -5,5 +5,6 @@
 void kernel_main(void) {
         tty_init();
         serial_init();
+        serial_writestring("Hello world\n");
         printf("Hello world\n");
 }