diff options
Diffstat (limited to 'sys/kern/tty_cons.c')
| -rw-r--r-- | sys/kern/tty_cons.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/sys/kern/tty_cons.c b/sys/kern/tty_cons.c new file mode 100644 index 0000000..f5fc887 --- /dev/null +++ b/sys/kern/tty_cons.c @@ -0,0 +1,244 @@ +/* + * Copyright (c) 1988 University of Utah. + * Copyright (c) 1991 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: @(#)cons.c 7.2 (Berkeley) 5/9/91 + * $Id: cons.c,v 1.10 1994/01/23 19:17:17 davidg Exp $ + */ + + +#include "sys/param.h" +#include "sys/proc.h" +#include "sys/user.h" +#include "sys/systm.h" +#include "sys/buf.h" +#include "sys/ioctl.h" +#include "sys/tty.h" +#include "sys/file.h" +#include "sys/conf.h" +#include "sys/vnode.h" +#include "machine/stdarg.h" + +#include "machine/cons.h" + +/* XXX - all this could be autoconfig()ed */ +int pccnprobe(), pccninit(), pccngetc(), pccnputc(); + +#include "sio.h" +#if NSIO > 0 +int siocnprobe(), siocninit(), siocngetc(), siocnputc(); +#endif + +#include "com.h" +#if NCOM > 0 +int comcnprobe(), comcninit(), comcngetc(), comcnputc(); +#endif + +struct consdev constab[] = { + { pccnprobe, pccninit, pccngetc, pccnputc }, +#if NSIO > 0 + { siocnprobe, siocninit, siocngetc, siocnputc }, +#endif +#if NCOM > 0 + { comcnprobe, comcninit, comcngetc, comcnputc }, +#endif + { 0 }, +}; +/* end XXX */ + +struct tty *constty = 0; /* virtual console output device */ +struct consdev *cn_tab; /* physical console device info */ +struct tty *cn_tty; /* XXX: console tty struct for tprintf */ + +void +cninit() +{ + register struct consdev *cp; + + /* + * Collect information about all possible consoles + * and find the one with highest priority + */ + for (cp = constab; cp->cn_probe; cp++) { + (*cp->cn_probe)(cp); + if (cp->cn_pri > CN_DEAD && + (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri)) + cn_tab = cp; + } + /* + * No console, we can handle it + */ + if ((cp = cn_tab) == NULL) + return; + /* + * Turn on console + */ + cn_tty = cp->cn_tp; + (*cp->cn_init)(cp); +} + +int +cnopen(dev, flag, mode, p) + dev_t dev; + int flag, mode; + struct proc *p; +{ + struct vnode *vp = 0; + + if (cn_tab == NULL) + return (0); + + dev = cn_tab->cn_dev; + if ((vfinddev(dev, VCHR, &vp) == 0) && vcount(vp)) + return (0); + + return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p)); +} + +int +cnclose(dev, flag, mode, p) + dev_t dev; + int flag, mode; + struct proc *p; +{ + struct vnode *vp = 0; + + if (cn_tab == NULL) + return (0); + + dev = cn_tab->cn_dev; + if ((vfinddev(dev, VCHR, &vp) == 0) && vcount(vp)) + return (0); + + return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, p)); +} + +int +cnread(dev, uio, flag) + dev_t dev; + struct uio *uio; + int flag; +{ + if (cn_tab == NULL) + return (0); + dev = cn_tab->cn_dev; + return ((*cdevsw[major(dev)].d_read)(dev, uio, flag)); +} + +int +cnwrite(dev, uio, flag) + dev_t dev; + struct uio *uio; + int flag; +{ + if (cn_tab == NULL) + return (0); + if (constty) + dev = constty->t_dev; + else + dev = cn_tab->cn_dev; + return ((*cdevsw[major(dev)].d_write)(dev, uio, flag)); +} + +int +cnioctl(dev, cmd, data, flag, p) + dev_t dev; + int cmd; + caddr_t data; + int flag; + struct proc *p; +{ + int error; + + if (cn_tab == NULL) + return (0); + /* + * Superuser can always use this to wrest control of console + * output from the "virtual" console. + */ + if (cmd == TIOCCONS && constty) { + error = suser(p->p_ucred, (u_short *) NULL); + if (error) + return (error); + constty = NULL; + return (0); + } + dev = cn_tab->cn_dev; + return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag, p)); +} + +/*ARGSUSED*/ +int +cnselect(dev, rw, p) + dev_t dev; + int rw; + struct proc *p; +{ + if (cn_tab == NULL) + return (1); + return (ttselect(cn_tab->cn_dev, rw, p)); +} + +int +cngetc() +{ + if (cn_tab == NULL) + return (0); + return ((*cn_tab->cn_getc)(cn_tab->cn_dev)); +} + +void +cnputc(c) + register int c; +{ + if (cn_tab == NULL) + return; + if (c) { + (*cn_tab->cn_putc)(cn_tab->cn_dev, c); + if (c == '\n') + (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); + } +} + +int +pg(const char *p, ...) { + va_list args; + va_start(args, p); + printf("%r\n>", p, args); + return(cngetc()); +} + + |
