logging: make term and printf smp safe

kernel-src/io/logging.c

@@ -1,3 +1,7 @@
+#include <mutex.h>
+
+mutex_t printf_mutex;
+
 static void nohook(char c) {
 
 }
@@ -12,3 +16,7 @@ void _putchar(char c) {
 void logging_sethook(void (*fun)(char)) {
 	hook = fun;
 }
+
+void logging_init() {
+	MUTEX_INIT(&printf_mutex);
+}

kernel-src/io/term.c

@@ -20,9 +20,12 @@ static void *internalalloc(size_t n) {
 }
 
 static struct flanterm_context *term_ctx;
+static mutex_t term_mutex;
 
 void term_write(char *str, size_t count) {
+	MUTEX_ACQUIRE(&term_mutex, false);
 	flanterm_write(term_ctx, str, count);
+	MUTEX_RELEASE(&term_mutex);
 }
 
 void term_putchar(char c) {
@@ -55,4 +58,6 @@ void term_init() {
 	ys = term_ctx->rows;
 	fbxs = fb->width;
 	fbys = fb->height;
+
+	MUTEX_INIT(&term_mutex);
 }