| /* |
| * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) |
| * Licensed under the GPL |
| */ |
| |
| #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 "line.h" |
| #include "ssl.h" |
| #include "chan_kern.h" |
| #include "user_util.h" |
| #include "kern_util.h" |
| #include "kern.h" |
| #include "init.h" |
| #include "irq_user.h" |
| #include "mconsole_kern.h" |
| |
| static const int ssl_version = 1; |
| |
| /* Referenced only by tty_driver below - presumably it's locked correctly |
| * by the tty driver. |
| */ |
| |
| static struct tty_driver *ssl_driver; |
| |
| #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, |
| .tramp_stack = 0, |
| .in_kernel = 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 = SSL_IRQ, |
| .read_irq_name = "ssl", |
| .write_irq = SSL_WRITE_IRQ, |
| .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 struct line serial_lines[NR_PORTS] = |
| { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) }; |
| |
| 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_open(struct tty_struct *tty, struct file *filp) |
| { |
| return line_open(serial_lines, tty); |
| } |
| |
| #if 0 |
| static void ssl_flush_buffer(struct tty_struct *tty) |
| { |
| return; |
| } |
| |
| static void ssl_stop(struct tty_struct *tty) |
| { |
| printk(KERN_ERR "Someone should implement ssl_stop\n"); |
| } |
| |
| static void ssl_start(struct tty_struct *tty) |
| { |
| printk(KERN_ERR "Someone should implement ssl_start\n"); |
| } |
| |
| void ssl_hangup(struct tty_struct *tty) |
| { |
| } |
| #endif |
| |
| static const struct tty_operations ssl_ops = { |
| .open = ssl_open, |
| .close = line_close, |
| .write = line_write, |
| .put_char = line_put_char, |
| .write_room = line_write_room, |
| .chars_in_buffer = line_chars_in_buffer, |
| .flush_buffer = line_flush_buffer, |
| .flush_chars = line_flush_chars, |
| .set_termios = line_set_termios, |
| .ioctl = line_ioctl, |
| .throttle = line_throttle, |
| .unthrottle = line_unthrottle, |
| #if 0 |
| .stop = ssl_stop, |
| .start = ssl_start, |
| .hangup = ssl_hangup, |
| #endif |
| }; |
| |
| /* 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 = 0; |
| |
| 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_list, string, len); |
| spin_unlock_irqrestore(&line->lock, flags); |
| } |
| |
| static struct tty_driver *ssl_console_device(struct console *c, int *index) |
| { |
| *index = c->index; |
| return ssl_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, |
| .index = -1, |
| }; |
| |
| static int ssl_init(void) |
| { |
| char *new_title; |
| |
| printk(KERN_INFO "Initializing software serial port version %d\n", |
| ssl_version); |
| ssl_driver = register_lines(&driver, &ssl_ops, serial_lines, |
| ARRAY_SIZE(serial_lines)); |
| |
| lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts); |
| |
| new_title = add_xterm_umid(opts.xterm_title); |
| if (new_title != NULL) |
| opts.xterm_title = new_title; |
| |
| 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) |
| { |
| char *error; |
| int ret; |
| |
| ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error); |
| if(ret < 0) |
| printk(KERN_ERR "Failed to set up serial line with " |
| "configuration string \"%s\" : %s\n", str, error); |
| |
| return 1; |
| } |
| |
| __setup("ssl", ssl_chan_setup); |
| __channel_help(ssl_chan_setup, "ssl"); |