tty: implement read/write support

kernel/tty/device.c

@@ -2,6 +2,11 @@
 #include <socks/device.h>
 #include <socks/libc/stdio.h>
 
+static struct char_device_ops tty_ops = {
+	.read = tty_read,
+	.write = tty_write,
+};
+
 struct device *tty_device_create(void)
 {
 	struct char_device *cdev = char_device_create();
@@ -15,7 +20,9 @@ struct device *tty_device_create(void)
 		return NULL;
 	}
 
+	cdev->c_ops = &tty_ops;
 	cdev->c_tty = tty_dev;
+
 	return char_device_base(cdev);
 }
 

kernel/tty/driver.c

@@ -8,7 +8,7 @@ static struct vm_cache tty_driver_cache = {
 static struct queue tty_drivers;
 static spin_lock_t tty_drivers_lock;
 
-kern_status_t tty_init(void)
+kern_status_t tty_bootstrap(void)
 {
 	vm_cache_init(&tty_driver_cache);
 	tty_drivers = QUEUE_INIT;

kernel/tty/tty.c

@@ -0,0 +1,56 @@
+#include <socks/tty.h>
+#include <socks/printk.h>
+
+static void putchar(struct device *tty, int c)
+{
+	struct tty_device *ttydev = TTY_DEVICE(tty);
+	struct tty_driver *tty_driver = TTY_DRIVER(tty->dev_owner);
+	struct tty_driver_ops *ops = tty_driver->tty_ops;
+
+	if (!ops->tty_putc) {
+		return;
+	}
+
+	if (tty_driver->tty_type == TTY_DRIVER_SIMPLE) {
+		ops->tty_putc(tty, c, -1, -1, 0);
+		return;
+	}
+
+	ops->tty_putc(tty, c, ttydev->tty_xcur, ttydev->tty_ycur, ttydev->tty_curattrib);
+	ttydev->tty_xcur++;
+
+	if (ttydev->tty_xcur >= ttydev->tty_xcells) {
+		ttydev->tty_xcur = 0;
+		ttydev->tty_ycur++;
+	}
+
+	if (ttydev->tty_ycur >= ttydev->tty_ycells) {
+		if (ops->tty_scroll) {
+			ops->tty_scroll(tty, TTY_SCROLL_DOWN, 1);
+		} else {
+			ttydev->tty_xcur = 0;
+			ttydev->tty_ycur = 0;
+		}
+	}
+
+	ops->tty_move_cursor(tty, ttydev->tty_xcur, ttydev->tty_ycur);
+}
+
+kern_status_t tty_read(struct device *tty, void *buf, size_t max, size_t *nr_read, socks_flags_t flags)
+{
+	printk("tty_read");
+	return KERN_OK;
+}
+
+kern_status_t tty_write(struct device *tty, const void *buf, size_t len, size_t *nr_written, socks_flags_t flags)
+{
+	size_t r = 0;
+	const char *s = buf;
+	for (size_t i = 0; i < len; i++) {
+		putchar(tty, s[i]);
+		r++;
+	}
+
+	*nr_written = r;
+	return KERN_OK;
+}