X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/8f6c56a50524aa785f7e596d52dddfb331e18961..7e4a7d3939db04e70062ae6c7bf24b8c8b2f5a7c:/bsd/dev/i386/cons.c?ds=inline diff --git a/bsd/dev/i386/cons.c b/bsd/dev/i386/cons.c index 39a9b3e2b..dbd46a1cc 100644 --- a/bsd/dev/i386/cons.c +++ b/bsd/dev/i386/cons.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * @@ -25,19 +25,27 @@ * * @APPLE_OSREFERENCE_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. - */ /* - * 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 @@ -47,246 +55,95 @@ #include #include -struct tty cons; struct tty *constty; /* current console device */ -int cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp); -int cnclose(__unused dev_t dev, int flag, int mode, struct proc *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]; + +/* + * 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, int cmd, caddr_t addr, int flg, struct proc *p); -int cnselect(__unused dev_t dev, int flag, void * wql, struct proc *p); - -void slave_cnenable(void); - -int alert( - __unused int width, - __unused int height, - __unused const char *title, - const char *msg, - int p1, int p2, int p3, int p4, int p5, int p6, int p7, int p8); -int alert_done(void); +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); -/*ARGSUSED*/ -int -cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp) +static dev_t +cndev(void) { - dev_t device; - boolean_t funnel_state; - int error; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - if (constty) - device = constty->t_dev; + return constty->t_dev; else - device = cons.t_dev; - error = (*cdevsw[major(device)].d_open)(device, flag, devtype, pp); - thread_funnel_set(kernel_flock, funnel_state); - - return(error); + return km_tty[0]->t_dev; } -/*ARGSUSED*/ int -cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp) +cnopen(__unused dev_t dev, int flag, int devtype, struct proc *pp) { - dev_t device; - boolean_t funnel_state; - int error; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - error = (*cdevsw[major(device)].d_close)(device, flag, mode, pp); - thread_funnel_set(kernel_flock, funnel_state); - - return(error); + dev = cndev(); + return ((*cdevsw[major(dev)].d_open)(dev, flag, devtype, pp)); +} +int +cnclose(__unused dev_t dev, int flag, int mode, struct proc *pp) +{ + dev = cndev(); + return ((*cdevsw[major(dev)].d_close)(dev, flag, mode, pp)); } -/*ARGSUSED*/ + int cnread(__unused dev_t dev, struct uio *uio, int ioflag) { - dev_t device; - boolean_t funnel_state; - int error; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - error = (*cdevsw[major(device)].d_read)(device, uio, ioflag); - thread_funnel_set(kernel_flock, funnel_state); - - return(error); + dev = cndev(); + return ((*cdevsw[major(dev)].d_read)(dev, uio, ioflag)); } -/*ARGSUSED*/ + int cnwrite(__unused dev_t dev, struct uio *uio, int ioflag) { - dev_t device; - boolean_t funnel_state; - int error; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - error = (*cdevsw[major(device)].d_write)(device, uio, ioflag); - thread_funnel_set(kernel_flock, funnel_state); - - return(error); + dev = cndev(); + return ((*cdevsw[major(dev)].d_write)(dev, uio, ioflag)); } -/*ARGSUSED*/ + int -cnioctl(__unused dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p) +cnioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) { - dev_t device; - boolean_t funnel_state; - int error; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; + 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) { - error = proc_suser(p); - if (error) { - goto out; + int error = proc_suser(p); + if (!error) { + constty = NULL; } - constty = NULL; - error = 0; - goto out; + return(error); } - error = (*cdevsw[major(device)].d_ioctl)(device, cmd, addr, flag, p); -out: - thread_funnel_set(kernel_flock, funnel_state); +#endif /* 0 */ - return(error); + return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, addr, flag, p)); } -/*ARGSUSED*/ -/* called with funnel held */ -int -cnselect(__unused 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() +cnselect(__unused dev_t dev, int flag, void *wql, struct proc *p) { - dev_t device; - boolean_t funnel_state; - int error; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - error = (*cdevsw[major(device)].d_getc)(device); - thread_funnel_set(kernel_flock, funnel_state); - - return(error); + dev = cndev(); + return ((*cdevsw[major(dev)].d_select)(dev, flag, wql, p)); } - -/*ARGSUSED*/ -int -cnputc(c) - char c; -{ - dev_t device; - boolean_t funnel_state; - int error; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - if (constty) - device = constty->t_dev; - else - device = cons.t_dev; - error = (*cdevsw[major(device)].d_putc)(device, c); - thread_funnel_set(kernel_flock, funnel_state); - - return(error); -} -#endif - -void -slave_cnenable(void) -{ - /* FIXME: what to do here? */ -} - -#if 0 -void -kprintf( const char *format, ...) -{ - /* on PPC this outputs to the serial line */ - /* nop on intel ... umeshv@apple.com */ - -} -#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( - __unused int width, - __unused int height, - __unused 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(void) -{ - /* DoRestore(); */ - return 0; -} -