![Paolo 'Blaisorblade' Giarrusso](/assets/img/avatar_default.png)
Since both UML consoles do not use percpu variables, they may be called when the cpu is still offline, and they may be marked CON_ANYTIME (this is documented in kernel/printk.c, grep for CON_ANYTIME to find mentions of this). Works well in testing done with lock debug enabled, should be safe but is not needed for next release. This would probably help also stderr_console.c, but this is yet to test. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
230 lines
5.3 KiB
C
230 lines
5.3 KiB
C
/*
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* Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include "linux/fs.h"
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#include "linux/tty.h"
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#include "linux/tty_driver.h"
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#include "linux/major.h"
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#include "linux/mm.h"
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#include "linux/init.h"
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#include "linux/console.h"
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#include "asm/termbits.h"
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#include "asm/irq.h"
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#include "line.h"
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#include "ssl.h"
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#include "chan_kern.h"
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#include "user_util.h"
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#include "kern_util.h"
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#include "kern.h"
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#include "init.h"
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#include "irq_user.h"
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#include "mconsole_kern.h"
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static const int ssl_version = 1;
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/* Referenced only by tty_driver below - presumably it's locked correctly
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* by the tty driver.
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*/
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static struct tty_driver *ssl_driver;
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#define NR_PORTS 64
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static void ssl_announce(char *dev_name, int dev)
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{
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printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
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dev_name);
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}
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/* Almost const, except that xterm_title may be changed in an initcall */
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static struct chan_opts opts = {
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.announce = ssl_announce,
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.xterm_title = "Serial Line #%d",
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.raw = 1,
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.tramp_stack = 0,
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.in_kernel = 1,
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};
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static int ssl_config(char *str, char **error_out);
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static int ssl_get_config(char *dev, char *str, int size, char **error_out);
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static int ssl_remove(int n, char **error_out);
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/* Const, except for .mc.list */
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static struct line_driver driver = {
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.name = "UML serial line",
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.device_name = "ttyS",
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.major = TTY_MAJOR,
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.minor_start = 64,
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.type = TTY_DRIVER_TYPE_SERIAL,
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.subtype = 0,
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.read_irq = SSL_IRQ,
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.read_irq_name = "ssl",
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.write_irq = SSL_WRITE_IRQ,
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.write_irq_name = "ssl-write",
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.mc = {
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.list = LIST_HEAD_INIT(driver.mc.list),
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.name = "ssl",
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.config = ssl_config,
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.get_config = ssl_get_config,
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.id = line_id,
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.remove = ssl_remove,
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},
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};
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/* The array is initialized by line_init, at initcall time. The
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* elements are locked individually as needed.
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*/
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static struct line serial_lines[NR_PORTS] =
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{ [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
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static int ssl_config(char *str, char **error_out)
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{
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return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
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error_out);
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}
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static int ssl_get_config(char *dev, char *str, int size, char **error_out)
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{
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return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
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size, error_out);
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}
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static int ssl_remove(int n, char **error_out)
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{
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return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
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error_out);
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}
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static int ssl_open(struct tty_struct *tty, struct file *filp)
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{
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return line_open(serial_lines, tty);
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}
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#if 0
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static void ssl_flush_buffer(struct tty_struct *tty)
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{
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return;
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}
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static void ssl_stop(struct tty_struct *tty)
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{
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printk(KERN_ERR "Someone should implement ssl_stop\n");
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}
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static void ssl_start(struct tty_struct *tty)
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{
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printk(KERN_ERR "Someone should implement ssl_start\n");
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}
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void ssl_hangup(struct tty_struct *tty)
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{
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}
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#endif
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static const struct tty_operations ssl_ops = {
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.open = ssl_open,
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.close = line_close,
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.write = line_write,
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.put_char = line_put_char,
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.write_room = line_write_room,
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.chars_in_buffer = line_chars_in_buffer,
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.flush_buffer = line_flush_buffer,
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.flush_chars = line_flush_chars,
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.set_termios = line_set_termios,
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.ioctl = line_ioctl,
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.throttle = line_throttle,
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.unthrottle = line_unthrottle,
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#if 0
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.stop = ssl_stop,
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.start = ssl_start,
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.hangup = ssl_hangup,
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#endif
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};
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/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
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* by being an initcall and exitcall, respectively.
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*/
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static int ssl_init_done = 0;
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static void ssl_console_write(struct console *c, const char *string,
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unsigned len)
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{
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struct line *line = &serial_lines[c->index];
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unsigned long flags;
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spin_lock_irqsave(&line->lock, flags);
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console_write_chan(&line->chan_list, string, len);
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spin_unlock_irqrestore(&line->lock, flags);
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}
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static struct tty_driver *ssl_console_device(struct console *c, int *index)
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{
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*index = c->index;
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return ssl_driver;
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}
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static int ssl_console_setup(struct console *co, char *options)
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{
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struct line *line = &serial_lines[co->index];
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return console_open_chan(line, co);
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}
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/* No locking for register_console call - relies on single-threaded initcalls */
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static struct console ssl_cons = {
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.name = "ttyS",
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.write = ssl_console_write,
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.device = ssl_console_device,
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.setup = ssl_console_setup,
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.flags = CON_PRINTBUFFER|CON_ANYTIME,
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.index = -1,
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};
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static int ssl_init(void)
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{
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char *new_title;
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printk(KERN_INFO "Initializing software serial port version %d\n",
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ssl_version);
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ssl_driver = register_lines(&driver, &ssl_ops, serial_lines,
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ARRAY_SIZE(serial_lines));
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lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts);
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new_title = add_xterm_umid(opts.xterm_title);
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if (new_title != NULL)
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opts.xterm_title = new_title;
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ssl_init_done = 1;
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register_console(&ssl_cons);
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return 0;
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}
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late_initcall(ssl_init);
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static void ssl_exit(void)
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{
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if (!ssl_init_done)
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return;
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close_lines(serial_lines, ARRAY_SIZE(serial_lines));
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}
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__uml_exitcall(ssl_exit);
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static int ssl_chan_setup(char *str)
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{
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char *error;
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int ret;
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ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error);
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if(ret < 0)
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printk(KERN_ERR "Failed to set up serial line with "
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"configuration string \"%s\" : %s\n", str, error);
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return 1;
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}
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__setup("ssl", ssl_chan_setup);
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__channel_help(ssl_chan_setup, "ssl");
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