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