Add a default common print method

src/kernel/common.h

@@ -2,10 +2,17 @@
 #define COMMON_H
 
 /**
- * Sends a kernel panic message through the UART and hang the core.
+ * Sends a panic message through the default output of the kernel.
  * @param format The format of the message
  * @param ... The parameters of the message
  */
 void panic(const char *format, ...);
 
+/**
+ * Prints a string to the default output of the kernel.
+ * @param format The format of the string
+ * @param ... The parameters of the string
+ */
+void print(const char *format, ...);
+
 #endif

src/kernel/kernel.c

@@ -1,3 +1,4 @@
+#include "common.h"
 #include "syscon.h"
 #include "uart.h"
 
@@ -5,7 +6,8 @@
  
 void kmain(void) {
 	uart_init();
-	uart_printf("Hello world, %s!\n", ARCH);
+
+	print("Hello world, %s!\n", ARCH);
 
 	power_off();
 }

src/kernel/riscv64/common.c

@@ -1,21 +1,39 @@
 #include "../common.h"
-
+#include "../uart.h"
 #include <stdarg.h>
 
-#include "../uart.h"
+#define VPRINT(method, format, args) \
+    VPRINT_(method, format, args)
+#define VPRINT_(method, format, args) \
+    method ## _ ## vprintf(format, args)
+
+#define PRINT(method, str)\
+    PRINT_(method, str)
+#define PRINT_(method, str)\
+    method ## _ ## puts(str)
+
+#define DEFAULT_OUTPUT_METHOD uart
+#define DEFAULT_PRINT_ARGS(format)  \
+    va_list args = nullptr;         \
+    va_start(args, format);         \
+    DEFAULT_VPRINT(format, args);    \
+    va_end(args)
+#define DEFAULT_VPRINT(format, args) \
+    VPRINT(DEFAULT_OUTPUT_METHOD, format, args)
+#define DEFAULT_PRINT(str)\
+    PRINT(DEFAULT_OUTPUT_METHOD, str)
 
 void panic(const char *format, ...) {
-    uart_puts("Kernel panic!");
-    uart_puts("Reason:");
-
-    va_list args = nullptr;
-    va_start(args, format);
+    DEFAULT_PRINT("Kernel panic!");
+    DEFAULT_PRINT("Reason:");
 
     // Print the reason
-    uart_vprintf(format, args);
-
-    va_end(args);
+    DEFAULT_PRINT_ARGS(format);
 
     // Hang
     asm volatile("wfi");
 }
+
+void print(const char *format, ...) {
+    DEFAULT_PRINT_ARGS(format);
+}