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已复制！
#include <errno.h>
#include <termios.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/tty.h>
#include <asm/io.h>
#include <asm/segment.h>
#include <asm/system.h>
static unsigned short quotient[] = {
0, 2304, 1536, 1047, 857,
768, 576, 384, 192, 96,
64, 48, 24, 12, 6, 3
};
static void change_speed(struct tty_struct * tty)
{
unsigned short port,quot;
if (!(port = tty->read_q.data))
return;
quot = quotient[tty->termios.c_cflag & CBAUD];
cli();
outb_p(0x80,port+3);
outb_p(quot & 0xff,port);
outb_p(quot >> 8,port+1);
outb(0x03,port+3);
sti();
}
static void flush(struct tty_queue * queue)
{
cli();
queue->head = queue->tail;
sti();
}
static void wait_until_sent(struct tty_struct * tty)
{
}
static void send_break(struct tty_struct * tty)
{
}
static int get_termios(struct tty_struct * tty, struct termios * termios)
{
int i;
verify_area(termios, sizeof (*termios));
for (i=0 ; i< (sizeof (*termios)) ; i++)
put_fs_byte( ((char *)&tty->termios)[i] , i+(char *)termios );
return 0;
}
static int set_termios(struct tty_struct * tty, struct termios * termios)
{
int i;
for (i=0 ; i< (sizeof (*termios)) ; i++)
((char *)&tty->termios)[i]=get_fs_byte(i+(char *)termios);
change_speed(tty);
return 0;
}
static int get_termio(struct tty_struct * tty, struct termio * termio)
{
int i;
struct termio tmp_termio;
verify_area(termio, sizeof (*termio));
tmp_termio.c_iflag = tty->termios.c_iflag;
tmp_termio.c_oflag = tty->termios.c_oflag;
tmp_termio.c_cflag = tty->termios.c_cflag;
tmp_termio.c_lflag = tty->termios.c_lflag;
tmp_termio.c_line = tty->termios.c_line;
for(i=0 ; i < NCC ; i++)
tmp_termio.c_cc[i] = tty->termios.c_cc[i];
for (i=0 ; i< (sizeof (*termio)) ; i++)
put_fs_byte( ((char *)&tmp_termio)[i] , i+(char *)termio );
return 0;
}
static int set_termio(struct tty_struct * tty, struct termio * termio)
{
int i;
struct termio tmp_termio;
for (i=0 ; i< (sizeof (*termio)) ; i++)
((char *)&tmp_termio)[i]=get_fs_byte(i+(char *)termio);
*(unsigned short *)&tty->termios.c_iflag = tmp_termio.c_iflag;
*(unsigned short *)&tty->termios.c_oflag = tmp_termio.c_oflag;
*(unsigned short *)&tty->termios.c_cflag = tmp_termio.c_cflag;
*(unsigned short *)&tty->termios.c_lflag = tmp_termio.c_lflag;
tty->termios.c_line = tmp_termio.c_line;
for(i=0 ; i < NCC ; i++)
tty->termios.c_cc[i] = tmp_termio.c_cc[i];
change_speed(tty);
return 0;
}
int tty_ioctl(int dev, int cmd, int arg)
{
struct tty_struct * tty;
if (MAJOR(dev) == 5) {
dev=current->tty;
if (dev<0)
panic("tty_ioctl: dev<0");
} else
dev=MINOR(dev);
tty = dev + tty_table;
switch (cmd) {
case TCGETS:
return get_termios(tty,(struct termios *) arg);
case TCSETSF:
flush(&tty->read_q);
case TCSETSW:
wait_until_sent(tty);
case TCSETS:
return set_termios(tty,(struct termios *) arg);
case TCGETA:
return get_termio(tty,(struct termio *) arg);
case TCSETAF:
flush(&tty->read_q);
case TCSETAW:
wait_until_sent(tty);
case TCSETA:
return set_termio(tty,(struct termio *) arg);
case TCSBRK:
if (!arg) {
wait_until_sent(tty);
send_break(tty);
}
return 0;
case TCXONC:
return -EINVAL;
case TCFLSH:
if (arg==0)
flush(&tty->read_q);
else if (arg==1)
flush(&tty->write_q);
else if (arg==2) {
flush(&tty->read_q);
flush(&tty->write_q);
} else
return -EINVAL;
return 0;
case TIOCEXCL:
return -EINVAL;
case TIOCNXCL:
return -EINVAL;
case TIOCSCTTY:
return -EINVAL;
case TIOCGPGRP:
verify_area((void *) arg,4);
put_fs_long(tty->pgrp,(unsigned long *) arg);
return 0;
case TIOCSPGRP:
tty->pgrp=get_fs_long((unsigned long *) arg);
return 0;
case TIOCOUTQ:
verify_area((void *) arg,4);
put_fs_long(CHARS(tty->write_q),(unsigned long *) arg);
return 0;
case TIOCINQ:
verify_area((void *) arg,4);
put_fs_long(CHARS(tty->secondary),
(unsigned long *) arg);
return 0;
case TIOCSTI:
return -EINVAL;
case TIOCGWINSZ:
return -EINVAL;
case TIOCSWINSZ:
return -EINVAL;
case TIOCMGET:
return -EINVAL;
case TIOCMBIS:
return -EINVAL;
case TIOCMBIC:
return -EINVAL;
case TIOCMSET:
return -EINVAL;
case TIOCGSOFTCAR:
return -EINVAL;
case TIOCSSOFTCAR:
return -EINVAL;
default:
return -EINVAL;
}
}
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