more fixes

core/print.c

@@ -2,11 +2,12 @@
 #include <zinnia/console.h>
 #include <zinnia/panic.h>
 #include <zinnia/print.h>
+#include <zinnia/spin.h>
+#include <zinnia/stdlib.h>
+#include <zinnia/string.h>
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdint.h>
-#include <zinnia/stdlib.h>
-#include <zinnia/string.h>
 
 typedef void (*log_fn_t)(void* ctx, const char* buf, size_t len);
 
@@ -312,13 +313,23 @@ static void printf_console(void*, const char* msg, size_t len) {
     console_write(msg, len);
 }
 
+static struct spinlock print_lock = {};
+
 void kprintf(const char* message, ...) {
+    spin_lock(&print_lock);
+
     va_list args;
     va_start(args, message);
     do_print(printf_console, nullptr, message, args);
     va_end(args);
+
+    spin_unlock(&print_lock);
 }
 
 void kvprintf(const char* message, va_list args) {
+    spin_lock(&print_lock);
+
     do_print(printf_console, nullptr, message, args);
+
+    spin_unlock(&print_lock);
 }