kernel: add basic console registration system and printk()

include/socks/console.h

@@ -1,7 +1,29 @@
 #ifndef SOCKS_CONSOLE_H_
 #define SOCKS_CONSOLE_H_
 
-extern void console_init(void);
-extern void console_putchar(int c);
+#include <socks/queue.h>
+#include <socks/locks.h>
+#include <socks/status.h>
+
+typedef enum console_flags {
+	CON_BOOT = 0x01u,
+} console_flags_t;
+
+typedef struct console {
+	char c_name[16];
+	console_flags_t c_flags;
+	spin_lock_t c_lock;
+
+	void (*c_write)(struct console *, const char *, unsigned int);
+	int (*c_read)(struct console *, char *, unsigned int);
+
+	queue_entry_t c_list;
+} console_t;
+
+extern kern_status_t console_register(console_t *con);
+extern kern_status_t console_unregister(console_t *con);
+
+extern void console_write(console_t *con, const char *s, unsigned int len);
+extern int console_read(console_t *con, char *s, unsigned int len);
 
 #endif

include/socks/printk.h

@@ -1,6 +1,9 @@
 #ifndef SOCKS_PRINTK_H_
 #define SOCKS_PRINTK_H_
 
+#include <socks/console.h>
+
+extern void early_printk_init(console_t *con);
 extern int printk(const char *format, ...);
 
 #endif

include/socks/status.h

@@ -3,7 +3,8 @@
 
 typedef unsigned int kern_status_t;
 
-#define KERN_OK			(0)
-#define KERN_ERR_UNIMPLEMENTED	(1)
+#define KERN_OK            (0)
+#define KERN_UNIMPLEMENTED (1)
+#define KERN_NAME_EXISTS   (2)
 
 #endif