1 files changed, 202 insertions, 0 deletions
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
new file mode 100644
index 0000000000..277cea3d30
--- /dev/null
+++ b/arch/um/drivers/ssl.c
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0
+/* 
+ * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
+ */
+
+#include <linux/fs.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <asm/termbits.h>
+#include <asm/irq.h>
+#include "chan.h"
+#include <init.h>
+#include <irq_user.h>
+#include "mconsole_kern.h"
+
+static const int ssl_version = 1;
+
+#define NR_PORTS 64
+
+static void ssl_announce(char *dev_name, int dev)
+{
+	printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
+	       dev_name);
+}
+
+/* Almost const, except that xterm_title may be changed in an initcall */
+static struct chan_opts opts = {
+	.announce 	= ssl_announce,
+	.xterm_title	= "Serial Line #%d",
+	.raw		= 1,
+};
+
+static int ssl_config(char *str, char **error_out);
+static int ssl_get_config(char *dev, char *str, int size, char **error_out);
+static int ssl_remove(int n, char **error_out);
+
+
+/* Const, except for .mc.list */
+static struct line_driver driver = {
+	.name 			= "UML serial line",
+	.device_name 		= "ttyS",
+	.major 			= TTY_MAJOR,
+	.minor_start 		= 64,
+	.type 		 	= TTY_DRIVER_TYPE_SERIAL,
+	.subtype 	 	= 0,
+	.read_irq_name 		= "ssl",
+	.write_irq_name 	= "ssl-write",
+	.mc  = {
+		.list		= LIST_HEAD_INIT(driver.mc.list),
+		.name  		= "ssl",
+		.config 	= ssl_config,
+		.get_config 	= ssl_get_config,
+		.id		= line_id,
+		.remove 	= ssl_remove,
+	},
+};
+
+/* The array is initialized by line_init, at initcall time.  The
+ * elements are locked individually as needed.
+ */
+static char *conf[NR_PORTS];
+static char *def_conf = CONFIG_SSL_CHAN;
+static struct line serial_lines[NR_PORTS];
+
+static int ssl_config(char *str, char **error_out)
+{
+	return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
+			   error_out);
+}
+
+static int ssl_get_config(char *dev, char *str, int size, char **error_out)
+{
+	return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
+			       size, error_out);
+}
+
+static int ssl_remove(int n, char **error_out)
+{
+	return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
+			   error_out);
+}
+
+static int ssl_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+	return line_install(driver, tty, &serial_lines[tty->index]);
+}
+
+static const struct tty_operations ssl_ops = {
+	.open 	 		= line_open,
+	.close 	 		= line_close,
+	.write 	 		= line_write,
+	.write_room		= line_write_room,
+	.chars_in_buffer 	= line_chars_in_buffer,
+	.flush_buffer 		= line_flush_buffer,
+	.flush_chars 		= line_flush_chars,
+	.throttle 		= line_throttle,
+	.unthrottle 		= line_unthrottle,
+	.install		= ssl_install,
+	.hangup			= line_hangup,
+};
+
+/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
+ * by being an initcall and exitcall, respectively.
+ */
+static int ssl_init_done;
+
+static void ssl_console_write(struct console *c, const char *string,
+			      unsigned len)
+{
+	struct line *line = &serial_lines[c->index];
+	unsigned long flags;
+
+	spin_lock_irqsave(&line->lock, flags);
+	console_write_chan(line->chan_out, string, len);
+	spin_unlock_irqrestore(&line->lock, flags);
+}
+
+static struct tty_driver *ssl_console_device(struct console *c, int *index)
+{
+	*index = c->index;
+	return driver.driver;
+}
+
+static int ssl_console_setup(struct console *co, char *options)
+{
+	struct line *line = &serial_lines[co->index];
+
+	return console_open_chan(line, co);
+}
+
+/* No locking for register_console call - relies on single-threaded initcalls */
+static struct console ssl_cons = {
+	.name		= "ttyS",
+	.write		= ssl_console_write,
+	.device		= ssl_console_device,
+	.setup		= ssl_console_setup,
+	.flags		= CON_PRINTBUFFER|CON_ANYTIME,
+	.index		= -1,
+};
+
+static int ssl_init(void)
+{
+	char *new_title;
+	int err;
+	int i;
+
+	printk(KERN_INFO "Initializing software serial port version %d\n",
+	       ssl_version);
+
+	err = register_lines(&driver, &ssl_ops, serial_lines,
+				    ARRAY_SIZE(serial_lines));
+	if (err)
+		return err;
+
+	new_title = add_xterm_umid(opts.xterm_title);
+	if (new_title != NULL)
+		opts.xterm_title = new_title;
+
+	for (i = 0; i < NR_PORTS; i++) {
+		char *error;
+		char *s = conf[i];
+		if (!s)
+			s = def_conf;
+		if (setup_one_line(serial_lines, i, s, &opts, &error))
+			printk(KERN_ERR "setup_one_line failed for "
+			       "device %d : %s\n", i, error);
+	}
+
+	ssl_init_done = 1;
+	register_console(&ssl_cons);
+	return 0;
+}
+late_initcall(ssl_init);
+
+static void ssl_exit(void)
+{
+	if (!ssl_init_done)
+		return;
+	close_lines(serial_lines, ARRAY_SIZE(serial_lines));
+}
+__uml_exitcall(ssl_exit);
+
+static int ssl_chan_setup(char *str)
+{
+	line_setup(conf, NR_PORTS, &def_conf, str, "serial line");
+	return 1;
+}
+
+__setup("ssl", ssl_chan_setup);
+__channel_help(ssl_chan_setup, "ssl");
+
+static int ssl_non_raw_setup(char *str)
+{
+	opts.raw = 0;
+	return 1;
+}
+__setup("ssl-non-raw", ssl_non_raw_setup);
+__channel_help(ssl_non_raw_setup, "set serial lines to non-raw mode");