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linux/arch/um/drivers/line.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

682 lines
15 KiB
C
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/*
* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/sched.h"
#include "linux/slab.h"
#include "linux/list.h"
#include "linux/kd.h"
#include "linux/interrupt.h"
#include "linux/devfs_fs_kernel.h"
#include "asm/uaccess.h"
#include "chan_kern.h"
#include "irq_user.h"
#include "line.h"
#include "kern.h"
#include "user_util.h"
#include "kern_util.h"
#include "os.h"
#include "irq_kern.h"
#define LINE_BUFSIZE 4096
static irqreturn_t line_interrupt(int irq, void *data, struct pt_regs *unused)
{
struct tty_struct *tty = data;
struct line *line = tty->driver_data;
if (line)
chan_interrupt(&line->chan_list, &line->task, tty, irq);
return IRQ_HANDLED;
}
static void line_timer_cb(void *arg)
{
struct tty_struct *tty = arg;
struct line *line = tty->driver_data;
line_interrupt(line->driver->read_irq, arg, NULL);
}
static int write_room(struct line *dev)
{
int n;
if (dev->buffer == NULL)
return (LINE_BUFSIZE - 1);
n = dev->head - dev->tail;
if (n <= 0)
n = LINE_BUFSIZE + n;
return (n - 1);
}
static int buffer_data(struct line *line, const char *buf, int len)
{
int end, room;
if(line->buffer == NULL){
line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
if (line->buffer == NULL) {
printk("buffer_data - atomic allocation failed\n");
return(0);
}
line->head = line->buffer;
line->tail = line->buffer;
}
room = write_room(line);
len = (len > room) ? room : len;
end = line->buffer + LINE_BUFSIZE - line->tail;
if(len < end){
memcpy(line->tail, buf, len);
line->tail += len;
}
else {
memcpy(line->tail, buf, end);
buf += end;
memcpy(line->buffer, buf, len - end);
line->tail = line->buffer + len - end;
}
return(len);
}
static int flush_buffer(struct line *line)
{
int n, count;
if ((line->buffer == NULL) || (line->head == line->tail))
return(1);
if (line->tail < line->head) {
count = line->buffer + LINE_BUFSIZE - line->head;
n = write_chan(&line->chan_list, line->head, count,
line->driver->write_irq);
if (n < 0)
return(n);
if (n == count)
line->head = line->buffer;
else {
line->head += n;
return(0);
}
}
count = line->tail - line->head;
n = write_chan(&line->chan_list, line->head, count,
line->driver->write_irq);
if(n < 0) return(n);
line->head += n;
return(line->head == line->tail);
}
int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
{
struct line *line = tty->driver_data;
unsigned long flags;
int n, err, ret = 0;
if(tty->stopped) return 0;
down(&line->sem);
if(line->head != line->tail){
local_irq_save(flags);
ret = buffer_data(line, buf, len);
err = flush_buffer(line);
local_irq_restore(flags);
if(err <= 0 && (err != -EAGAIN || !ret))
ret = err;
}
else {
n = write_chan(&line->chan_list, buf, len,
line->driver->write_irq);
if(n < 0){
ret = n;
goto out_up;
}
len -= n;
ret += n;
if(len > 0)
ret += buffer_data(line, buf + n, len);
}
out_up:
up(&line->sem);
return(ret);
}
void line_put_char(struct tty_struct *tty, unsigned char ch)
{
line_write(tty, &ch, sizeof(ch));
}
void line_set_termios(struct tty_struct *tty, struct termios * old)
{
/* nothing */
}
int line_chars_in_buffer(struct tty_struct *tty)
{
return 0;
}
static struct {
int cmd;
char *level;
char *name;
} tty_ioctls[] = {
/* don't print these, they flood the log ... */
{ TCGETS, NULL, "TCGETS" },
{ TCSETS, NULL, "TCSETS" },
{ TCSETSW, NULL, "TCSETSW" },
{ TCFLSH, NULL, "TCFLSH" },
{ TCSBRK, NULL, "TCSBRK" },
/* general tty stuff */
{ TCSETSF, KERN_DEBUG, "TCSETSF" },
{ TCGETA, KERN_DEBUG, "TCGETA" },
{ TIOCMGET, KERN_DEBUG, "TIOCMGET" },
{ TCSBRKP, KERN_DEBUG, "TCSBRKP" },
{ TIOCMSET, KERN_DEBUG, "TIOCMSET" },
/* linux-specific ones */
{ TIOCLINUX, KERN_INFO, "TIOCLINUX" },
{ KDGKBMODE, KERN_INFO, "KDGKBMODE" },
{ KDGKBTYPE, KERN_INFO, "KDGKBTYPE" },
{ KDSIGACCEPT, KERN_INFO, "KDSIGACCEPT" },
};
int line_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
int ret;
int i;
ret = 0;
switch(cmd) {
#ifdef TIOCGETP
case TIOCGETP:
case TIOCSETP:
case TIOCSETN:
#endif
#ifdef TIOCGETC
case TIOCGETC:
case TIOCSETC:
#endif
#ifdef TIOCGLTC
case TIOCGLTC:
case TIOCSLTC:
#endif
case TCGETS:
case TCSETSF:
case TCSETSW:
case TCSETS:
case TCGETA:
case TCSETAF:
case TCSETAW:
case TCSETA:
case TCXONC:
case TCFLSH:
case TIOCOUTQ:
case TIOCINQ:
case TIOCGLCKTRMIOS:
case TIOCSLCKTRMIOS:
case TIOCPKT:
case TIOCGSOFTCAR:
case TIOCSSOFTCAR:
return -ENOIOCTLCMD;
#if 0
case TCwhatever:
/* do something */
break;
#endif
default:
for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++)
if (cmd == tty_ioctls[i].cmd)
break;
if (i < ARRAY_SIZE(tty_ioctls)) {
if (NULL != tty_ioctls[i].level)
printk("%s%s: %s: ioctl %s called\n",
tty_ioctls[i].level, __FUNCTION__,
tty->name, tty_ioctls[i].name);
} else {
printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n",
__FUNCTION__, tty->name, cmd);
}
ret = -ENOIOCTLCMD;
break;
}
return(ret);
}
static irqreturn_t line_write_interrupt(int irq, void *data,
struct pt_regs *unused)
{
struct tty_struct *tty = data;
struct line *line = tty->driver_data;
int err;
err = flush_buffer(line);
if(err == 0)
return(IRQ_NONE);
else if(err < 0){
line->head = line->buffer;
line->tail = line->buffer;
}
if(tty == NULL)
return(IRQ_NONE);
if(test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) &&
(tty->ldisc.write_wakeup != NULL))
(tty->ldisc.write_wakeup)(tty);
/* BLOCKING mode
* In blocking mode, everything sleeps on tty->write_wait.
* Sleeping in the console driver would break non-blocking
* writes.
*/
if(waitqueue_active(&tty->write_wait))
wake_up_interruptible(&tty->write_wait);
return(IRQ_HANDLED);
}
int line_setup_irq(int fd, int input, int output, struct tty_struct *tty)
{
struct line *line = tty->driver_data;
struct line_driver *driver = line->driver;
int err = 0, flags = SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM;
if(input) err = um_request_irq(driver->read_irq, fd, IRQ_READ,
line_interrupt, flags,
driver->read_irq_name, tty);
if(err) return(err);
if(output) err = um_request_irq(driver->write_irq, fd, IRQ_WRITE,
line_write_interrupt, flags,
driver->write_irq_name, tty);
line->have_irq = 1;
return(err);
}
void line_disable(struct tty_struct *tty, int current_irq)
{
struct line *line = tty->driver_data;
if(!line->have_irq)
return;
if(line->driver->read_irq == current_irq)
free_irq_later(line->driver->read_irq, tty);
else {
free_irq_by_irq_and_dev(line->driver->read_irq, tty);
free_irq(line->driver->read_irq, tty);
}
if(line->driver->write_irq == current_irq)
free_irq_later(line->driver->write_irq, tty);
else {
free_irq_by_irq_and_dev(line->driver->write_irq, tty);
free_irq(line->driver->write_irq, tty);
}
line->have_irq = 0;
}
int line_open(struct line *lines, struct tty_struct *tty,
struct chan_opts *opts)
{
struct line *line;
int err = 0;
line = &lines[tty->index];
tty->driver_data = line;
down(&line->sem);
if (tty->count == 1) {
if (!line->valid) {
err = -ENODEV;
goto out;
}
if (list_empty(&line->chan_list)) {
err = parse_chan_pair(line->init_str, &line->chan_list,
line->init_pri, tty->index, opts);
if(err) goto out;
err = open_chan(&line->chan_list);
if(err) goto out;
}
enable_chan(&line->chan_list, tty);
INIT_WORK(&line->task, line_timer_cb, tty);
}
if(!line->sigio){
chan_enable_winch(&line->chan_list, tty);
line->sigio = 1;
}
chan_window_size(&line->chan_list, &tty->winsize.ws_row,
&tty->winsize.ws_col);
line->count++;
out:
up(&line->sem);
return(err);
}
void line_close(struct tty_struct *tty, struct file * filp)
{
struct line *line = tty->driver_data;
down(&line->sem);
line->count--;
if (tty->count == 1) {
line_disable(tty, -1);
tty->driver_data = NULL;
}
up(&line->sem);
}
void close_lines(struct line *lines, int nlines)
{
int i;
for(i = 0; i < nlines; i++)
close_chan(&lines[i].chan_list);
}
int line_setup(struct line *lines, int num, char *init, int all_allowed)
{
int i, n;
char *end;
if(*init == '=') n = -1;
else {
n = simple_strtoul(init, &end, 0);
if(*end != '='){
printk(KERN_ERR "line_setup failed to parse \"%s\"\n",
init);
return(0);
}
init = end;
}
init++;
if((n >= 0) && (n >= num)){
printk("line_setup - %d out of range ((0 ... %d) allowed)\n",
n, num - 1);
return(0);
}
else if (n >= 0){
if (lines[n].count > 0) {
printk("line_setup - device %d is open\n", n);
return(0);
}
if (lines[n].init_pri <= INIT_ONE){
lines[n].init_pri = INIT_ONE;
if (!strcmp(init, "none"))
lines[n].valid = 0;
else {
lines[n].init_str = init;
lines[n].valid = 1;
}
}
}
else if(!all_allowed){
printk("line_setup - can't configure all devices from "
"mconsole\n");
return(0);
}
else {
for(i = 0; i < num; i++){
if(lines[i].init_pri <= INIT_ALL){
lines[i].init_pri = INIT_ALL;
if(!strcmp(init, "none")) lines[i].valid = 0;
else {
lines[i].init_str = init;
lines[i].valid = 1;
}
}
}
}
return(1);
}
int line_config(struct line *lines, int num, char *str)
{
char *new = uml_strdup(str);
if(new == NULL){
printk("line_config - uml_strdup failed\n");
return(-ENOMEM);
}
return(!line_setup(lines, num, new, 0));
}
int line_get_config(char *name, struct line *lines, int num, char *str,
int size, char **error_out)
{
struct line *line;
char *end;
int dev, n = 0;
dev = simple_strtoul(name, &end, 0);
if((*end != '\0') || (end == name)){
*error_out = "line_get_config failed to parse device number";
return(0);
}
if((dev < 0) || (dev >= num)){
*error_out = "device number of of range";
return(0);
}
line = &lines[dev];
down(&line->sem);
if(!line->valid)
CONFIG_CHUNK(str, size, n, "none", 1);
else if(line->count == 0)
CONFIG_CHUNK(str, size, n, line->init_str, 1);
else n = chan_config_string(&line->chan_list, str, size, error_out);
up(&line->sem);
return(n);
}
int line_remove(struct line *lines, int num, char *str)
{
char config[sizeof("conxxxx=none\0")];
sprintf(config, "%s=none", str);
return(!line_setup(lines, num, config, 0));
}
int line_write_room(struct tty_struct *tty)
{
struct line *dev = tty->driver_data;
int room;
if (tty->stopped)
return 0;
room = write_room(dev);
if (0 == room)
printk(KERN_DEBUG "%s: %s: no room left in buffer\n",
__FUNCTION__,tty->name);
return room;
}
struct tty_driver *line_register_devfs(struct lines *set,
struct line_driver *line_driver,
struct tty_operations *ops, struct line *lines,
int nlines)
{
int i;
struct tty_driver *driver = alloc_tty_driver(nlines);
if (!driver)
return NULL;
driver->driver_name = line_driver->name;
driver->name = line_driver->device_name;
driver->devfs_name = line_driver->devfs_name;
driver->major = line_driver->major;
driver->minor_start = line_driver->minor_start;
driver->type = line_driver->type;
driver->subtype = line_driver->subtype;
driver->flags = TTY_DRIVER_REAL_RAW;
driver->init_termios = tty_std_termios;
tty_set_operations(driver, ops);
if (tty_register_driver(driver)) {
printk("%s: can't register %s driver\n",
__FUNCTION__,line_driver->name);
put_tty_driver(driver);
return NULL;
}
for(i = 0; i < nlines; i++){
if(!lines[i].valid)
tty_unregister_device(driver, i);
}
mconsole_register_dev(&line_driver->mc);
return driver;
}
void lines_init(struct line *lines, int nlines)
{
struct line *line;
int i;
for(i = 0; i < nlines; i++){
line = &lines[i];
INIT_LIST_HEAD(&line->chan_list);
sema_init(&line->sem, 1);
if(line->init_str != NULL){
line->init_str = uml_strdup(line->init_str);
if(line->init_str == NULL)
printk("lines_init - uml_strdup returned "
"NULL\n");
}
}
}
struct winch {
struct list_head list;
int fd;
int tty_fd;
int pid;
struct tty_struct *tty;
};
irqreturn_t winch_interrupt(int irq, void *data, struct pt_regs *unused)
{
struct winch *winch = data;
struct tty_struct *tty;
struct line *line;
int err;
char c;
if(winch->fd != -1){
err = generic_read(winch->fd, &c, NULL);
if(err < 0){
if(err != -EAGAIN){
printk("winch_interrupt : read failed, "
"errno = %d\n", -err);
printk("fd %d is losing SIGWINCH support\n",
winch->tty_fd);
return(IRQ_HANDLED);
}
goto out;
}
}
tty = winch->tty;
if (tty != NULL) {
line = tty->driver_data;
chan_window_size(&line->chan_list,
&tty->winsize.ws_row,
&tty->winsize.ws_col);
kill_pg(tty->pgrp, SIGWINCH, 1);
}
out:
if(winch->fd != -1)
reactivate_fd(winch->fd, WINCH_IRQ);
return(IRQ_HANDLED);
}
DECLARE_MUTEX(winch_handler_sem);
LIST_HEAD(winch_handlers);
void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty)
{
struct winch *winch;
down(&winch_handler_sem);
winch = kmalloc(sizeof(*winch), GFP_KERNEL);
if (winch == NULL) {
printk("register_winch_irq - kmalloc failed\n");
goto out;
}
*winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list),
.fd = fd,
.tty_fd = tty_fd,
.pid = pid,
.tty = tty });
list_add(&winch->list, &winch_handlers);
if(um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt,
SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM,
"winch", winch) < 0)
printk("register_winch_irq - failed to register IRQ\n");
out:
up(&winch_handler_sem);
}
static void winch_cleanup(void)
{
struct list_head *ele;
struct winch *winch;
list_for_each(ele, &winch_handlers){
winch = list_entry(ele, struct winch, list);
if(winch->fd != -1){
deactivate_fd(winch->fd, WINCH_IRQ);
os_close_file(winch->fd);
}
if(winch->pid != -1)
os_kill_process(winch->pid, 1);
}
}
__uml_exitcall(winch_cleanup);
char *add_xterm_umid(char *base)
{
char *umid, *title;
int len;
umid = get_umid(1);
if(umid == NULL) return(base);
len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
title = kmalloc(len, GFP_KERNEL);
if(title == NULL){
printk("Failed to allocate buffer for xterm title\n");
return(base);
}
snprintf(title, len, "%s (%s)", base, umid);
return(title);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/
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