kernel: add header files

include/kernel/console.h

@@ -0,0 +1,56 @@
+#ifndef KERNEL_CONSOLE_H_
+#define KERNEL_CONSOLE_H_
+
+/* The console system
+
+   Consoles are like simplified TTYs. Their purpose is to serve as an output
+   sink for messages printed using printk.
+
+   a struct console could be used to represent a serial port, UART port, or even
+   a text-based framebuffer display. Anything where the job of displaying
+   or sending text can be abstracted to a simple write() call.
+
+   A secondary purpose of consoles is to allow input. For example, a console
+   representing a serial port may allow both sending AND receiving over the
+   port.
+*/
+#include <kernel/queue.h>
+#include <kernel/locks.h>
+#include <mango/status.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum console_flags {
+	/* console is only used during the boot process. the console
+	   will be automatically de-registered when the first
+	   non-boot console is registered */
+	CON_BOOT = 0x01u,
+};
+
+struct console {
+	char c_name[16];
+	enum console_flags c_flags;
+	spin_lock_t c_lock;
+
+	void (*c_write)(struct console *, const char *, unsigned int);
+	int (*c_read)(struct console *, char *, unsigned int);
+
+	struct queue_entry c_list;
+};
+
+extern kern_status_t console_register(struct console *con);
+extern kern_status_t console_unregister(struct console *con);
+
+extern struct queue *get_consoles(unsigned long *flags);
+extern void put_consoles(struct queue *consoles, unsigned long flags);
+
+extern void console_write(struct console *con, const char *s, unsigned int len);
+extern int console_read(struct console *con, char *s, unsigned int len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif