828 строки
19 KiB
C
828 строки
19 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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/* Returns the free space inside the ring buffer of this line.
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*
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* Should be called while holding line->lock (this does not modify datas).
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*/
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static int write_room(struct line *line)
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{
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int n;
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if (line->buffer == NULL)
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return LINE_BUFSIZE - 1;
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/* This is for the case where the buffer is wrapped! */
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n = line->head - line->tail;
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if (n <= 0)
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n = LINE_BUFSIZE + n; /* The other case */
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return n - 1;
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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 *line = tty->driver_data;
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unsigned long flags;
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int room;
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if (tty->stopped)
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return 0;
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spin_lock_irqsave(&line->lock, flags);
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room = write_room(line);
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spin_unlock_irqrestore(&line->lock, flags);
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/*XXX: Warning to remove */
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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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int line_chars_in_buffer(struct tty_struct *tty)
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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 ret;
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spin_lock_irqsave(&line->lock, flags);
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/*write_room subtracts 1 for the needed NULL, so we readd it.*/
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ret = LINE_BUFSIZE - (write_room(line) + 1);
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spin_unlock_irqrestore(&line->lock, flags);
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return ret;
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}
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/*
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* This copies the content of buf into the circular buffer associated with
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* this line.
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* The return value is the number of characters actually copied, i.e. the ones
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* for which there was space: this function is not supposed to ever flush out
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* the circular buffer.
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*
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* Must be called while holding line->lock!
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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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} else {
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/* The circular buffer is wrapping */
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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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/*
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* Flushes the ring buffer to the output channels. That is, write_chan is
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* called, passing it line->head as buffer, and an appropriate count.
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*
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* On exit, returns 1 when the buffer is empty,
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* 0 when the buffer is not empty on exit,
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* and -errno when an error occurred.
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*
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* Must be called while holding line->lock!*/
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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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/* line->buffer + LINE_BUFSIZE is the end of the buffer! */
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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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/* We have flushed from ->head to buffer end, now we
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* must flush only from the beginning to ->tail.*/
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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)
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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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void line_flush_buffer(struct tty_struct *tty)
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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 err;
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/*XXX: copied from line_write, verify if it is correct!*/
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if(tty->stopped)
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return;
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//return 0;
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spin_lock_irqsave(&line->lock, flags);
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err = flush_buffer(line);
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/*if (err == 1)
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err = 0;*/
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spin_unlock_irqrestore(&line->lock, flags);
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//return err;
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}
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/* We map both ->flush_chars and ->put_char (which go in pair) onto ->flush_buffer
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* and ->write. Hope it's not that bad.*/
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void line_flush_chars(struct tty_struct *tty)
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{
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line_flush_buffer(tty);
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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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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)
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return 0;
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spin_lock_irqsave(&line->lock, flags);
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if (line->head != line->tail) {
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ret = buffer_data(line, buf, len);
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err = flush_buffer(line);
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if (err <= 0 && (err != -EAGAIN || !ret))
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ret = err;
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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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spin_unlock_irqrestore(&line->lock, flags);
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return ret;
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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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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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/* Interrupts are enabled here because we registered the interrupt with
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* SA_INTERRUPT (see line_setup_irq).*/
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spin_lock_irq(&line->lock);
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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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spin_unlock_irq(&line->lock);
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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)
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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)
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return err;
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if (output)
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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(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(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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/* The IRQ which takes this lock is not yet enabled and won't be run
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* before the end, so we don't need to use spin_lock_irq.*/
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spin_lock(&line->lock);
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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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/* Here the interrupt is registered.*/
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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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spin_unlock(&line->lock);
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return err;
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}
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static void unregister_winch(struct tty_struct *tty);
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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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/* XXX: I assume this should be called in process context, not with
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* interrupts disabled!
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*/
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spin_lock_irq(&line->lock);
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/* We ignore the error anyway! */
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flush_buffer(line);
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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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if((line->count == 0) && line->sigio){
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unregister_winch(tty);
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line->sigio = 0;
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}
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spin_unlock_irq(&line->lock);
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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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/* Common setup code for both startup command line and mconsole initialization.
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* @lines contains the the array (of size @num) to modify;
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* @init is the setup string;
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* @all_allowed is a boolean saying if we can setup the whole @lines
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* at once. For instance, it will be usually true for startup init. (where we
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* can use con=xterm) and false for mconsole.*/
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int line_setup(struct line *lines, unsigned 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 == '=') {
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/* We said con=/ssl= instead of con#=, so we are configuring all
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* consoles at once.*/
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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 >= (signed int) 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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} 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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} 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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} else {
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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, unsigned 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, unsigned 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 out of range";
|
|
return 0;
|
|
}
|
|
|
|
line = &lines[dev];
|
|
|
|
spin_lock(&line->lock);
|
|
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);
|
|
spin_unlock(&line->lock);
|
|
|
|
return n;
|
|
}
|
|
|
|
int line_id(char **str, int *start_out, int *end_out)
|
|
{
|
|
char *end;
|
|
int n;
|
|
|
|
n = simple_strtoul(*str, &end, 0);
|
|
if((*end != '\0') || (end == *str))
|
|
return -1;
|
|
|
|
*str = end;
|
|
*start_out = n;
|
|
*end_out = n;
|
|
return n;
|
|
}
|
|
|
|
int line_remove(struct line *lines, unsigned int num, int n)
|
|
{
|
|
char config[sizeof("conxxxx=none\0")];
|
|
|
|
sprintf(config, "%d=none", n);
|
|
return !line_setup(lines, num, config, 0);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static spinlock_t winch_handler_lock;
|
|
LIST_HEAD(winch_handlers);
|
|
|
|
void lines_init(struct line *lines, int nlines)
|
|
{
|
|
struct line *line;
|
|
int i;
|
|
|
|
spin_lock_init(&winch_handler_lock);
|
|
for(i = 0; i < nlines; i++){
|
|
line = &lines[i];
|
|
INIT_LIST_HEAD(&line->chan_list);
|
|
spin_lock_init(&line->lock);
|
|
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;
|
|
}
|
|
|
|
void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty)
|
|
{
|
|
struct winch *winch;
|
|
|
|
winch = kmalloc(sizeof(*winch), GFP_KERNEL);
|
|
if (winch == NULL) {
|
|
printk("register_winch_irq - kmalloc failed\n");
|
|
return;
|
|
}
|
|
|
|
*winch = ((struct winch) { .list = LIST_HEAD_INIT(winch->list),
|
|
.fd = fd,
|
|
.tty_fd = tty_fd,
|
|
.pid = pid,
|
|
.tty = tty });
|
|
|
|
spin_lock(&winch_handler_lock);
|
|
list_add(&winch->list, &winch_handlers);
|
|
spin_unlock(&winch_handler_lock);
|
|
|
|
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");
|
|
}
|
|
|
|
static void unregister_winch(struct tty_struct *tty)
|
|
{
|
|
struct list_head *ele;
|
|
struct winch *winch, *found = NULL;
|
|
|
|
spin_lock(&winch_handler_lock);
|
|
list_for_each(ele, &winch_handlers){
|
|
winch = list_entry(ele, struct winch, list);
|
|
if(winch->tty == tty){
|
|
found = winch;
|
|
break;
|
|
}
|
|
}
|
|
if(found == NULL)
|
|
goto err;
|
|
|
|
list_del(&winch->list);
|
|
spin_unlock(&winch_handler_lock);
|
|
|
|
if(winch->pid != -1)
|
|
os_kill_process(winch->pid, 1);
|
|
|
|
free_irq(WINCH_IRQ, winch);
|
|
kfree(winch);
|
|
|
|
return;
|
|
err:
|
|
spin_unlock(&winch_handler_lock);
|
|
}
|
|
|
|
/* XXX: No lock as it's an exitcall... is this valid? Depending on cleanup
|
|
* order... are we sure that nothing else is done on the list? */
|
|
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){
|
|
/* Why is this different from the above free_irq(),
|
|
* which deactivates SIGIO? This searches the FD
|
|
* somewhere else and removes it from the list... */
|
|
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;
|
|
}
|