X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d7e50217d7adf6e52786a38bcaa4cd698cb9a79e..0a7de7458d150b5d4dffc935ba399be265ef0a1a:/bsd/dev/i386/cons.c?ds=sidebyside diff --git a/bsd/dev/i386/cons.c b/bsd/dev/i386/cons.c index c2122a600..8a9ee5255 100644 --- a/bsd/dev/i386/cons.c +++ b/bsd/dev/i386/cons.c @@ -1,17 +1,20 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. - * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in - * compliance with the License. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. - * + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, @@ -19,22 +22,30 @@ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. - * - * @APPLE_LICENSE_HEADER_END@ - */ -/* - * Copyright (c) 1987, 1988 NeXT, Inc. * - * HISTORY - * 7-Jan-93 Mac Gillon (mgillon) at NeXT - * Integrated POSIX support - * - * 12-Aug-87 John Seamons (jks) at NeXT - * Ported to NeXT. - */ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ + */ /* - * Indirect driver for console. + * Indirect driver for console + * + * The purpose of this driver is to provide a device node indirection for + * the console device, which can be any tty class device. It does this by + * externalizing a global pointer "constty", which is then pointed at the + * console tty device. + * + * The default for this pointer is uninitialized; when it is NULL, we fall + * back to the "km" device, which is a tty BSD wrapper device for the + * Platform Expert console device. When it is non-NULL, we call through + * to the tty device device instead. + * + * The registration for this device node is static, and the devfs init + * code does not externalize a named device for it, to avoid software + * seeing the device and trying to open it. + * + * The upshot of this is that the console driver should not be set as your + * controlling tty, since you will get a reference to a device which does + * not have an actual device node in /dev, so its name cannot be looked up. */ #include #include @@ -44,201 +55,96 @@ #include #include -struct tty cons; -struct tty *constty; /* current console device */ +struct tty *constty; /* current console device */ -/*ARGSUSED*/ -int -cnopen(dev, flag, devtype, pp) - dev_t dev; - int flag, devtype; - struct proc *pp; -{ - dev_t device; - - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - return ((*cdevsw[major(device)].d_open)(device, flag, devtype, pp)); -} +/* + * The km driver supplied the default console device for the systems + * (usually a raw frame buffer driver, but potentially a serial driver). + */ +extern struct tty *km_tty[1]; -/*ARGSUSED*/ -int -cnclose(dev, flag, mode, pp) - dev_t dev; - int flag, mode; - struct proc *pp; +/* + * cdevsw[] entries for the console device driver + */ +int cnopen(__unused dev_t dev, int flag, int devtype, proc_t pp); +int cnclose(__unused dev_t dev, int flag, int mode, proc_t pp); +int cnread(__unused dev_t dev, struct uio *uio, int ioflag); +int cnwrite(__unused dev_t dev, struct uio *uio, int ioflag); +int cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flg, proc_t p); +int cnselect(__unused dev_t dev, int flag, void * wql, proc_t p); + +static dev_t +cndev(void) { - dev_t device; - - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - return ((*cdevsw[major(device)].d_close)(device, flag, mode, pp)); + if (constty) { + return constty->t_dev; + } else { + return km_tty[0]->t_dev; + } } -/*ARGSUSED*/ int -cnread(dev, uio, ioflag) - dev_t dev; - struct uio *uio; - int ioflag; +cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp) { - dev_t device; - - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - return ((*cdevsw[major(device)].d_read)(device, uio, ioflag)); + dev = cndev(); + return (*cdevsw[major(dev)].d_open)(dev, flag, devtype, pp); } -/*ARGSUSED*/ -int -cnwrite(dev, uio, ioflag) - dev_t dev; - struct uio *uio; - int ioflag; -{ - dev_t device; - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - return ((*cdevsw[major(device)].d_write)(device, uio, ioflag)); -} - -/*ARGSUSED*/ int -cnioctl(dev, cmd, addr, flag, p) - dev_t dev; - int cmd; - caddr_t addr; - int flag; - struct proc *p; +cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp) { - dev_t device; - - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - /* - * Superuser can always use this to wrest control of console - * output from the "virtual" console. - */ - if (cmd == TIOCCONS && constty) { - int error = suser(p->p_ucred, (u_short *) NULL); - if (error) - return (error); - constty = NULL; - return (0); - } - return ((*cdevsw[major(device)].d_ioctl)(device, cmd, addr, flag, p)); + dev = cndev(); + return (*cdevsw[major(dev)].d_close)(dev, flag, mode, pp); } -/*ARGSUSED*/ -int -cnselect(dev, flag, wql, p) - dev_t dev; - int flag; - void * wql; - struct proc *p; -{ - dev_t device; - - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - return ((*cdevsw[major(device)].d_select)(device, flag, wql, p)); -} -#if 0 /* FIXME - using OSFMK console driver for the moment */ int -cngetc() +cnread(__unused dev_t dev, struct uio *uio, int ioflag) { - dev_t device; - - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - return ((*cdevsw[major(device)].d_getc)(device)); + dev = cndev(); + return (*cdevsw[major(dev)].d_read)(dev, uio, ioflag); } -/*ARGSUSED*/ + int -cnputc(c) - char c; +cnwrite(__unused dev_t dev, struct uio *uio, int ioflag) { - dev_t device; - - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - return ((*cdevsw[major(device)].d_putc)(device, c)); + dev = cndev(); + return (*cdevsw[major(dev)].d_write)(dev, uio, ioflag); } -#endif -#if NCPUS > 1 -slave_cnenable() -{ - /* FIXME: what to do here? */ -} -#endif NCPUS > 1 -#if 0 -void -kprintf( const char *format, ...) +int +cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) { - /* on PPC this outputs to the serial line */ - /* nop on intel ... umeshv@apple.com */ + dev = cndev(); +#if 0 + /* + * Superuser can always use this to wrest control of console + * output from the "virtual" console. + * + * XXX Unfortunately, this code doesn't do what the author thougt + * XXX it did; use of the console device, a TIOCCONS would always + * XXX disassociate the console from a virtual terminal and send + * XXX it back to the fake tty. + */ + if ((unsigned) cmd == TIOCCONS && constty) { + int error = proc_suser(p); + if (!error) { + constty = NULL; + } + return error; + } +#endif /* 0 */ + return (*cdevsw[major(dev)].d_ioctl)(dev, cmd, addr, flag, p); } -#endif -/* - * Write message to console; create an alert panel if no text-type window - * currently exists. Caller must call alert_done() when finished. - * The height and width arguments are not used; they are provided for - * compatibility with the 68k version of alert(). - */ -int -alert( - int width, - int height, - const char *title, - const char *msg, - int p1, - int p2, - int p3, - int p4, - int p5, - int p6, - int p7, - int p8) -{ - char smsg[200]; - - sprintf(smsg, msg, p1, p2, p3, p4, p5, p6, p7, p8); -#if FIXME /* [ */ - /* DoAlert(title, smsg); */ -#else - printf("%s\n",smsg); -#endif /* FIXME ] */ - - return 0; -} -int -alert_done() +int +cnselect(__unused dev_t dev, int flag, void *wql, struct proc *p) { - /* DoRestore(); */ - return 0; + dev = cndev(); + return (*cdevsw[major(dev)].d_select)(dev, flag, wql, p); } -