/arch/um/drivers/line.c
https://bitbucket.org/evzijst/gittest · C · 681 lines · 569 code · 88 blank · 24 comment · 133 complexity · 38fc33a086b1115e9631fa1e81003820 MD5 · raw file
- /*
- * 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:
- */