add (not yet fully working - it can only send through uart now) interrupt-driven uart together with "scheduler"

1 files changed, 3 insertions, 1 deletions

diff --git a/PL0_test.c b/PL0_test.c
index c6cbe18..fed62a2 100644
--- a/PL0_test.c
+++ b/PL0_test.c
@@ -7,7 +7,9 @@ void PL0_main(void)
   // implemented correctly, this shall get printed
   puts("Hello userspace! Type 'f' if you want me to try accessing "
        "kernel memory!");
-  
+
+
+  asm volatile("mov r0, #17\n\rsvc #0" ::: "r0");
   while (1)
     {
       char c = getchar();