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https://git.FreeBSD.org/src.git
synced 2024-12-29 12:03:03 +00:00
Integrate the Xen console driver.
I initially didn't want to integrate the Xen console driver, because it did not receive any testing. Kip Macy suggested that I'd better check it in right now, because this is the easiest way for him to test it while he is working on the Xen import. Requested by: kmacy
This commit is contained in:
Ed Schouten
parent
00ba6aade4
commit
1781f8bd6d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=181908
@ -32,9 +32,7 @@ __FBSDID("$FreeBSD$");
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static char driver_name[] = "xc";
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devclass_t xc_devclass; /* do not make static */
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static void xcstart (struct tty *);
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static int xcparam (struct tty *, struct termios *);
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static void xcstop (struct tty *, int);
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static void xcoutwakeup(struct tty *);
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static void xc_timeout(void *);
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static void __xencons_tx_flush(void);
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static boolean_t xcons_putc(int c);
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@ -95,27 +93,14 @@ static unsigned int wc, wp; /* write_cons, write_prod */
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static struct tty *xccons;
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struct xc_softc {
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int xc_unit;
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struct cdev *xc_dev;
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};
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static tsw_open_t xcopen;
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static tsw_close_t xcclose;
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static d_open_t xcopen;
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static d_close_t xcclose;
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static d_ioctl_t xcioctl;
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static struct cdevsw xc_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_TTY | D_NEEDGIANT,
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.d_name = driver_name,
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.d_open = xcopen,
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.d_close = xcclose,
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.d_read = ttyread,
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.d_write = ttywrite,
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.d_ioctl = xcioctl,
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.d_poll = ttypoll,
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.d_kqfilter = ttykqfilter,
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static struct ttydevsw xc_ttydevsw = {
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.tsw_flags = TF_NOPREFIX,
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.tsw_open = xcopen,
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.tsw_close = xcclose,
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.tsw_outwakeup = xcoutwakeup,
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};
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static void
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@ -225,32 +210,20 @@ xc_identify(driver_t *driver, device_t parent)
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static int
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xc_probe(device_t dev)
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{
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struct xc_softc *sc = (struct xc_softc *)device_get_softc(dev);
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sc->xc_unit = device_get_unit(dev);
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return (0);
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}
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static int
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xc_attach(device_t dev)
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{
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struct xc_softc *sc = (struct xc_softc *)device_get_softc(dev);
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if (xen_start_info->flags & SIF_INITDOMAIN) {
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xc_consdev.cn_putc = xccnputc_dom0;
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}
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sc->xc_dev = make_dev(&xc_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "xc%r", 0);
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xccons = ttyalloc();
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sc->xc_dev->si_drv1 = (void *)sc;
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sc->xc_dev->si_tty = xccons;
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xccons->t_oproc = xcstart;
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xccons->t_param = xcparam;
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xccons->t_stop = xcstop;
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xccons->t_dev = sc->xc_dev;
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xccons = tty_alloc(&xc_ttydevsw, NULL, NULL);
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tty_makedev(xccons, NULL, "xc%r", 0);
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callout_init(&xc_callout, 0);
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@ -294,11 +267,15 @@ xencons_rx(char *buf, unsigned len)
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{
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int i;
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struct tty *tp = xccons;
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for (i = 0; i < len; i++) {
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if (xen_console_up)
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(*linesw[tp->t_line]->l_rint)(buf[i], tp);
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else
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if (xen_console_up) {
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tty_lock(tp);
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for (i = 0; i < len; i++)
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ttydisc_rint(tp, buf[i], 0);
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ttydisc_rint_done(tp);
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tty_unlock(tp);
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} else {
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for (i = 0; i < len; i++)
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rbuf[RBUF_MASK(rp++)] = buf[i];
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}
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}
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@ -306,7 +283,7 @@ xencons_rx(char *buf, unsigned len)
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static void
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__xencons_tx_flush(void)
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{
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int sz, work_done = 0;
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int sz;
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CN_LOCK(cn_mtx);
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while (wc != wp) {
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@ -323,16 +300,8 @@ __xencons_tx_flush(void)
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break;
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wc += sent;
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}
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work_done = 1;
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}
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CN_UNLOCK(cn_mtx);
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/*
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* ttwakeup calls routines using blocking locks
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*
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*/
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if (work_done && xen_console_up && curthread->td_critnest == 0)
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ttwakeup(xccons);
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}
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void
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@ -354,76 +323,19 @@ xencons_priv_interrupt(void *arg)
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xencons_tx();
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}
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int
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xcopen(struct cdev *dev, int flag, int mode, struct thread *td)
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static int
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xcopen(struct tty *tp)
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{
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struct xc_softc *sc;
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int unit = XCUNIT(dev);
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struct tty *tp;
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int s, error;
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sc = (struct xc_softc *)device_get_softc(
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devclass_get_device(xc_devclass, unit));
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if (sc == NULL)
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return (ENXIO);
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tp = dev->si_tty;
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s = spltty();
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if (!ISTTYOPEN(tp)) {
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tp->t_state |= TS_CARR_ON;
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ttychars(tp);
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tp->t_iflag = TTYDEF_IFLAG;
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tp->t_oflag = TTYDEF_OFLAG;
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tp->t_cflag = TTYDEF_CFLAG|CLOCAL;
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tp->t_lflag = TTYDEF_LFLAG;
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tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
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xcparam(tp, &tp->t_termios);
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ttsetwater(tp);
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} else if (tp->t_state & TS_XCLUDE && priv_check(td, PRIV_ROOT)) {
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splx(s);
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return (EBUSY);
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}
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splx(s);
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xen_console_up = 1;
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error = (*linesw[tp->t_line]->l_open)(dev, tp);
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return error;
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}
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int
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xcclose(struct cdev *dev, int flag, int mode, struct thread *td)
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{
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struct tty *tp = dev->si_tty;
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if (tp == NULL)
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return (0);
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xen_console_up = 0;
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spltty();
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(*linesw[tp->t_line]->l_close)(tp, flag);
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tty_close(tp);
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spl0();
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return (0);
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}
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int
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xcioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
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static void
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xcclose(struct tty *tp)
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{
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struct tty *tp = dev->si_tty;
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int error;
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error = (*linesw[tp->t_line]->l_ioctl)(tp, cmd, data, flag, td);
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if (error != ENOIOCTL)
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return (error);
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error = ttioctl(tp, cmd, data, flag);
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if (error != ENOIOCTL)
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return (error);
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return (ENOTTY);
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xen_console_up = 0;
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}
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static inline int
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@ -438,48 +350,21 @@ __xencons_put_char(int ch)
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static void
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xcstart(struct tty *tp)
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xcoutwakeup(struct tty *tp)
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{
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boolean_t cons_full = FALSE;
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char c;
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CN_LOCK(cn_mtx);
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if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
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CN_UNLOCK(cn_mtx);
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while (ttydisc_getc(tp, &c, 1) == 1 && !cons_full)
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cons_full = xcons_putc(c);
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ttwwakeup(tp);
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return;
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}
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tp->t_state |= TS_BUSY;
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CN_UNLOCK(cn_mtx);
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while (tp->t_outq.c_cc != 0 && !cons_full)
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cons_full = xcons_putc(getc(&tp->t_outq));
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/* if the console is close to full leave our state as busy */
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if (!cons_full) {
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CN_LOCK(cn_mtx);
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tp->t_state &= ~TS_BUSY;
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CN_UNLOCK(cn_mtx);
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ttwwakeup(tp);
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} else {
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if (cons_full) {
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/* let the timeout kick us in a bit */
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xc_start_needed = TRUE;
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}
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}
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static void
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xcstop(struct tty *tp, int flag)
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{
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if (tp->t_state & TS_BUSY) {
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if ((tp->t_state & TS_TTSTOP) == 0) {
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tp->t_state |= TS_FLUSH;
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}
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}
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}
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static void
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xc_timeout(void *v)
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{
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@ -488,33 +373,19 @@ xc_timeout(void *v)
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tp = (struct tty *)v;
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while ((c = xccncheckc(NULL)) != -1) {
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if (tp->t_state & TS_ISOPEN) {
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(*linesw[tp->t_line]->l_rint)(c, tp);
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}
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}
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tty_lock(tp);
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while ((c = xccncheckc(NULL)) != -1)
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ttydisc_rint(tp, c, 0);
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tty_unlock(tp);
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if (xc_start_needed) {
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xc_start_needed = FALSE;
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xcstart(tp);
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xcoutwakeup(tp);
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}
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callout_reset(&xc_callout, XC_POLLTIME, xc_timeout, tp);
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}
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/*
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* Set line parameters.
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*/
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int
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xcparam(struct tty *tp, struct termios *t)
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{
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tp->t_ispeed = t->c_ispeed;
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tp->t_ospeed = t->c_ospeed;
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tp->t_cflag = t->c_cflag;
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return (0);
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}
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static device_method_t xc_methods[] = {
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DEVMETHOD(device_identify, xc_identify),
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DEVMETHOD(device_probe, xc_probe),
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@ -525,7 +396,7 @@ static device_method_t xc_methods[] = {
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static driver_t xc_driver = {
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driver_name,
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xc_methods,
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sizeof(struct xc_softc),
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0,
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};
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/*** Forcibly flush console data before dying. ***/
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