xref: /onnv/onnv-gate/usr/src/uts/common/io/consconfig_dacf.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * This module performs two functions.  First, it kicks off the driver loading
 * of the console devices during boot in dynamic_console_config().
 * The loading of the drivers for the console devices triggers the
 * additional device autoconfiguration to link the drivers into the keyboard
 * and mouse console streams.
 *
 * The second function of this module is to provide the dacf functions
 * to be called after a driver has attached and before it detaches.  For
 * example, a driver associated with the keyboard will have kb_config called
 * after the driver attaches and kb_unconfig before it detaches.  Similar
 * configuration actions are performed on behalf of minor nodes representing
 * mice.  The configuration functions for the attach case take a module
 * name as a parameter.  The module is pushed on top of the driver during
 * the configuration.
 *
 * Although the dacf framework is used to configure all keyboards and mice,
 * its primary function is to allow keyboard and mouse hotplugging.
 *
 * This module supports multiple keyboards and mice at the same time.
 *
 * From the kernel perspective, there are roughly three different possible
 * console configurations.  Across these three configurations, the following
 * elements are constant:
 * 	wsconsvp = IWSCN_PATH
 * 	rwsconsvp = WC_PATH
 * 	consms -> msdev
 *
 * The "->" syntax indicates that the streams device on the right is
 * linked under the streams device on the left.
 *
 * The following lists how the system is configured for different setups:
 *
 * stdin is a local keyboard.  use stdin and stdout as the console.
 * 	sp->cons_input_type = CONSOLE_LOCAL
 *	rconsvp = IWSCN_PATH
 *	wc -> conskbd -> kbddev
 *
 * stdin is not a keyboard and stdin is the same as stdout.
 * assume we running on a tip line and use stdin/stdout as the console.
 * 	sp->cons_input_type = CONSOLE_TIP
 *	rconsvp = (stdindev/stdoutdev)
 *	wc -> conskbd -> kbddev
 *
 * stdin is not a keyboard device and it's not the same as stdout.
 * assume we have a serial keyboard hooked up and use it along with
 * stdout as the console.
 * 	sp->cons_input_type = CONSOLE_SERIAL_KEYBOARD
 *	rconsvp = IWSCN_PATH
 *	wc -> stdindev
 *	conskbd -> kbddev
 *
 * CAVEAT:
 * 	The above is all true except for one possible Intel configuration.
 * 	If stdin is set to a local keyboard but stdout is set to something
 * 	other than the local display (a tip port for example) stdout will
 * 	still go to the local display.  This is an artifact of the console
 * 	implementation on intel.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/cmn_err.h>
#include <sys/user.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/pathname.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/stropts.h>
#include <sys/stream.h>
#include <sys/strsubr.h>

#include <sys/consdev.h>
#include <sys/console.h>
#include <sys/wscons.h>
#include <sys/kbio.h>
#include <sys/debug.h>
#include <sys/reboot.h>
#include <sys/termios.h>

#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/sunldi.h>
#include <sys/sunndi.h>
#include <sys/ndi_impldefs.h>
#include <sys/modctl.h>
#include <sys/ddi_impldefs.h>
#include <sys/ddi_implfuncs.h>
#include <sys/promif.h>
#include <sys/fs/snode.h>

#include <sys/errno.h>
#include <sys/devops.h>
#include <sys/note.h>

#include <sys/tem_impl.h>
#include <sys/polled_io.h>
#include <sys/kmem.h>
#include <sys/dacf.h>
#include <sys/consconfig_dacf.h>
#include <sys/consplat.h>
#include <sys/log.h>
#include <sys/disp.h>

/*
 * External global variables
 */
extern vnode_t		*rconsvp;
extern dev_t		rwsconsdev;

/*
 * External functions
 */
extern uintptr_t	space_fetch(char *key);
extern int		space_store(char *key, uintptr_t ptr);

/*
 * Tasks
 */
static int	kb_config(dacf_infohdl_t, dacf_arghdl_t, int);
static int	kb_unconfig(dacf_infohdl_t, dacf_arghdl_t, int);
static int	ms_config(dacf_infohdl_t, dacf_arghdl_t, int);
static int	ms_unconfig(dacf_infohdl_t, dacf_arghdl_t, int);

/*
 * Internal functions
 */
static int	consconfig_setmodes(dev_t dev, struct termios *termiosp);
static void	consconfig_check_phys_kbd(cons_state_t *);
static void	consconfig_rem_dev(cons_state_t *, dev_t);
static void	consconfig_add_dev(cons_state_t *, cons_prop_t *);
static cons_prop_t *consconfig_find_dev(cons_state_t *, dev_t);
static void	consconfig_free_prop(cons_prop_t *prop);
static void	flush_usb_serial_buf(void);


/*
 * On supported configurations, the firmware defines the keyboard and mouse
 * paths.  However, during USB development, it is useful to be able to use
 * the USB keyboard and mouse on machines without full USB firmware support.
 * These variables may be set in /etc/system according to a machine's
 * USB configuration.  This module will override the firmware's values
 * with these.
 *
 * NOTE:
 * The master copies of these variables in the misc/consconfig module.
 * The reason for this is historic.  In versions of solaris up to and
 * including solaris 9 the conscole configuration code was split into a
 * seperate sparc and intel version.  These variables were defined
 * in misc/consconfig on sparc and dacf/consconfig_dacf on intel.
 *
 * Unfortunatly the sparc variables were well documented.
 * So to aviod breaking either sparc or intel we'll declare the variables
 * in both modules.  This will allow any /etc/system entries that
 * users may have to continue working.
 *
 * The variables in misc/consconfig will take precedence over the variables
 * found in this file.  Since we eventually want to remove the variables
 * local to this this file, if the user set them we'll emmit an error
 * message telling them they need to set the variables in misc/consconfig
 * instead.
 */
static char *usb_kb_path = NULL;
static char *usb_ms_path = NULL;

/*
 * Access functions in the misc/consconfig module used to retrieve the
 * values of it local usb_kb_path and usb_ms_path variables
 */
extern char *consconfig_get_usb_kb_path();
extern char *consconfig_get_usb_ms_path();

/*
 * Local variables used to store the value of the usb_kb_path and
 * usb_ms_path variables found in misc/consconfig
 */
static char *consconfig_usb_kb_path = NULL;
static char *consconfig_usb_ms_path = NULL;

/*
 * Internal variables
 */
static dev_t		stdoutdev;
static cons_state_t	*consconfig_sp;

/*
 * consconfig_errlevel:  debug verbosity; smaller numbers are more
 * verbose.
 */
int consconfig_errlevel = DPRINT_L3;

/*
 * Baud rate table
 */
#define	MAX_SPEEDS 24
static struct speed {
	char *name;
	int code;
} speedtab[MAX_SPEEDS] = {
	{"0", B0},		{"50", B50},		{"75", B75},
	{"110", B110},		{"134", B134},		{"150", B150},
	{"200", B200},		{"300", B300},		{"600", B600},
	{"1200", B1200},	{"1800", B1800},	{"2400", B2400},
	{"4800", B4800},	{"9600", B9600},	{"19200", B19200},
	{"38400", B38400},	{"57600", B57600},	{"76800", B76800},
	{"115200", B115200},	{"153600", B153600},	{"230400", B230400},
	{"307200", B307200},	{"460800", B460800},	{"", 0}
};

static dacf_op_t kbconfig_op[] = {
	{ DACF_OPID_POSTATTACH,	kb_config },
	{ DACF_OPID_PREDETACH,	kb_unconfig },
	{ DACF_OPID_END,	NULL },
};

static dacf_op_t msconfig_op[] = {
	{ DACF_OPID_POSTATTACH,	ms_config },
	{ DACF_OPID_PREDETACH,	ms_unconfig },
	{ DACF_OPID_END,	NULL },
};

static dacf_opset_t opsets[] = {
	{ "kb_config",	kbconfig_op },
	{ "ms_config",	msconfig_op },
	{ NULL,		NULL }
};

struct dacfsw dacfsw = {
	DACF_MODREV_1,
	opsets,
};

static struct modldacf modldacf = {
	&mod_dacfops,   /* Type of module */
	"Consconfig DACF",
	&dacfsw
};

static struct modlinkage modlinkage = {
	MODREV_1, (void *)&modldacf, NULL
};

int
_init(void) {
	return (mod_install(&modlinkage));
}

int
_fini(void)
{
	/*
	 * This modules state is held in the kernel by space.c
	 * allowing this module to be unloaded.
	 */
	return (mod_remove(&modlinkage));
}

int
_info(struct modinfo *modinfop)
{
	return (mod_info(&modlinkage, modinfop));
}

/*PRINTFLIKE2*/
static void consconfig_dprintf(int, const char *, ...)
    __KPRINTFLIKE(2);

static void
consconfig_dprintf(int l, const char *fmt, ...)
{
	va_list ap;

#ifndef DEBUG
	if (!l) {
		return;
	}
#endif /* DEBUG */
	if (l < consconfig_errlevel) {
		return;
	}

	va_start(ap, fmt);
	(void) vprintf(fmt, ap);
	va_end(ap);
}

/*
 * Return a property value for the specified alias in /aliases.
 */
char *
get_alias(char *alias, char *buf)
{
	pnode_t node;
	int len;

	/* The /aliases node only exists in OBP >= 2.4. */
	if ((node = prom_alias_node()) == OBP_BADNODE)
		return (NULL);

	if ((len = prom_getproplen(node, (caddr_t)alias)) <= 0)
		return (NULL);

	(void) prom_getprop(node, (caddr_t)alias, (caddr_t)buf);

	/*
	 * The IEEE 1275 standard specifies that /aliases string property
	 * values should be null-terminated.  Unfortunatly the reality
	 * is that most aren't and the OBP can't easily be modified to
	 * add null termination to these strings.  So we'll add the
	 * null termination here.  If the string already contains a
	 * null termination character then that's ok too because we'll
	 * just be adding a second one.
	 */
	buf[len] = '\0';

	prom_pathname(buf);
	return (buf);
}

/*
 * i_consconfig_createvp:
 *	This routine is a convenience routine that is passed a path and returns
 *	a vnode.
 */
static vnode_t *
i_consconfig_createvp(char *path)
{
	int error;
	vnode_t *vp;
	char *buf = NULL, *fullpath;

	DPRINTF(DPRINT_L0, "i_consconfig_createvp: %s\n", path);
	fullpath = kmem_alloc(MAXPATHLEN, KM_SLEEP);

	if (strchr(path, ':') == NULL) {
		/* convert an OBP path to a /devices path */
		buf = kmem_alloc(MAXPATHLEN, KM_SLEEP);
		if (i_ddi_prompath_to_devfspath(path, buf) != DDI_SUCCESS) {
			kmem_free(buf, MAXPATHLEN);
			kmem_free(fullpath, MAXPATHLEN);
			return (NULL);
		}
		(void) snprintf(fullpath, MAXPATHLEN, "/devices%s", buf);
		kmem_free(buf, MAXPATHLEN);
	} else {
		/* convert a devfs path to a /devices path */
		(void) snprintf(fullpath, MAXPATHLEN, "/devices%s", path);
	}

	DPRINTF(DPRINT_L0, "lookupname(%s)\n", fullpath);
	error = lookupname(fullpath, UIO_SYSSPACE, FOLLOW, NULLVPP, &vp);
	kmem_free(fullpath, MAXPATHLEN);
	if (error)
		return (NULL);

	DPRINTF(DPRINT_L0, "create vnode = 0x%p - dev 0x%lx\n", vp, vp->v_rdev);
	ASSERT(vn_matchops(vp, spec_getvnodeops()));

	return (vp);
}

/*
 * consconfig_print_paths:
 *	Function to print out the various paths
 */
static void
consconfig_print_paths(void)
{
	char    *path;

	if (usb_kb_path != NULL)
		cmn_err(CE_WARN,
		    "consconfig_dacf:usb_kb_path has been deprecated, "
		    "use consconfig:usb_kb_path instead");

	if (usb_ms_path != NULL)
		cmn_err(CE_WARN,
		    "consconfig_dacf:usb_ms_path has been deprecated, "
		    "use consconfig:usb_ms_path instead");

	if (consconfig_errlevel > DPRINT_L0)
		return;

	path = NULL;
	if (consconfig_usb_kb_path != NULL)
		path = consconfig_usb_kb_path;
	else if (usb_kb_path != NULL)
		path = usb_kb_path;
	if (path != NULL)
		DPRINTF(DPRINT_L0, "usb keyboard path = %s\n", path);

	path = plat_kbdpath();
	if (path != NULL)
		DPRINTF(DPRINT_L0, "keyboard path = %s\n", path);

	path = NULL;
	if (consconfig_usb_ms_path != NULL)
		path = consconfig_usb_ms_path;
	else if (usb_ms_path != NULL)
		path = usb_ms_path;
	if (path != NULL)
		DPRINTF(DPRINT_L0, "usb mouse path = %s\n", path);

	path = plat_mousepath();
	if (path != NULL)
		DPRINTF(DPRINT_L0, "mouse path = %s\n", path);

	path = plat_stdinpath();
	if (path != NULL)
		DPRINTF(DPRINT_L0, "stdin path = %s\n", path);

	path = plat_stdoutpath();
	if (path != NULL)
		DPRINTF(DPRINT_L0, "stdout path = %s\n", path);

	path = plat_fbpath();
	if (path != NULL)
		DPRINTF(DPRINT_L0, "fb path = %s\n", path);
}

/*
 * consconfig_kbd_abort_enable:
 * 	Send the CONSSETABORTENABLE ioctl to the lower layers.  This ioctl
 * 	will only be sent to the device if it is the console device.
 * 	This ioctl tells the device to pay attention to abort sequences.
 * 	In the case of kbtrans, this would tell the driver to pay attention
 * 	to the two key abort sequences like STOP-A.  In the case of the
 * 	serial keyboard, it would be an abort sequence like a break.
 */
static int
consconfig_kbd_abort_enable(ldi_handle_t lh)
{
	int	err, rval;

	DPRINTF(DPRINT_L0, "consconfig_kbd_abort_enable\n");

	err = ldi_ioctl(lh, CONSSETABORTENABLE, (uintptr_t)B_TRUE,
	    FKIOCTL, kcred, &rval);
	return (err);
}

/*
 * consconfig_kbd_abort_disable:
 * 	Send CONSSETABORTENABLE ioctl to lower layers.  This ioctl
 * 	will only be sent to the device if it is the console device.
 * 	This ioctl tells the physical device to ignore abort sequences,
 * 	and send the sequences up to virtual keyboard(conskbd) so that
 * 	STOP and A (or F1 and A) can be combined.
 */
static int
consconfig_kbd_abort_disable(ldi_handle_t lh)
{
	int	err, rval;

	DPRINTF(DPRINT_L0, "consconfig_kbd_abort_disable\n");

	err = ldi_ioctl(lh, CONSSETABORTENABLE, (uintptr_t)B_FALSE,
	    FKIOCTL, kcred, &rval);
	return (err);
}

#ifdef _HAVE_TEM_FIRMWARE
static int
consconfig_tem_supported(cons_state_t *sp)
{
	dev_t			dev;
	dev_info_t		*dip;
	int			*int_array;
	uint_t			nint;
	int			rv = 0;

	if (sp->cons_fb_path == NULL)
		return (0);

	if ((dev = ddi_pathname_to_dev_t(sp->cons_fb_path)) == NODEV)
		return (0); /* warning printed later by common code */

	/*
	 * Here we hold the driver and check "tem-support" property.
	 * We're doing this with e_ddi_hold_devi_by_dev and
	 * ddi_prop_lookup_int_array without opening the driver since
	 * some video cards that don't support the kernel terminal
	 * emulator could hang or crash if opened too early during
	 * boot.
	 */
	if ((dip = e_ddi_hold_devi_by_dev(dev, 0)) == NULL) {
		cmn_err(CE_WARN, "consconfig: cannot hold fb dev %s",
		    sp->cons_fb_path);
		return (0);
	}

	/*
	 * Check that the tem-support property exists AND that
	 * it is equal to 1.
	 */
	if (ddi_prop_lookup_int_array(DDI_DEV_T_ANY, dip,
	    DDI_PROP_DONTPASS, "tem-support", &int_array, &nint) ==
	    DDI_SUCCESS) {
		if (nint > 0)
			rv = int_array[0] == 1;
		ddi_prop_free(int_array);
	}

	ddi_release_devi(dip);

	return (rv);
}
#endif /* _HAVE_TEM_FIRMWARE */

/*
 * consconfig_get_polledio:
 * 	Query the console with the CONSPOLLEDIO ioctl.
 * 	The polled I/O routines are used by debuggers to perform I/O while
 * 	interrupts and normal kernel services are disabled.
 */
static cons_polledio_t *
consconfig_get_polledio(ldi_handle_t lh)
{
	int		err, rval;
	struct strioctl	strioc;
	cons_polledio_t	*polled_io;

	/*
	 * Setup the ioctl to be sent down to the lower driver.
	 */
	strioc.ic_cmd = CONSOPENPOLLEDIO;
	strioc.ic_timout = INFTIM;
	strioc.ic_len = sizeof (polled_io);
	strioc.ic_dp = (char *)&polled_io;

	/*
	 * Send the ioctl to the driver.  The ioctl will wait for
	 * the response to come back from wc.  wc has already issued
	 * the CONSOPENPOLLEDIO to the lower layer driver.
	 */
	err = ldi_ioctl(lh, I_STR, (intptr_t)&strioc, FKIOCTL, kcred, &rval);

	if (err != 0) {
		/*
		 * If the lower driver does not support polled I/O, then
		 * return NULL.  This will be the case if the driver does
		 * not handle polled I/O, or OBP is going to handle polled
		 * I/O for the device.
		 */

		return (NULL);
	}

	/*
	 * Return the polled I/O structure.
	 */
	return (polled_io);
}

/*
 * consconfig_setup_polledio:
 * 	This routine does the setup work for polled I/O.  First we get
 * 	the polled_io structure from the lower layers
 * 	and then we register the polled I/O
 * 	callbacks with the debugger that will be using them.
 */
static void
consconfig_setup_polledio(cons_state_t *sp, dev_t dev)
{
	cons_polledio_t		*polled_io;
	ldi_handle_t		lh;

	DPRINTF(DPRINT_L0, "consconfig_setup_polledio: start\n");


	if (ldi_open_by_dev(&dev, OTYP_CHR,
	    FREAD|FWRITE|FNOCTTY, kcred, &lh, sp->cons_li) != 0)
		return;


	/*
	 * Get the polled io routines so that we can use this
	 * device with the debuggers.
	 */
	polled_io = consconfig_get_polledio(lh);

	/*
	 * If the get polledio failed, then we do not want to throw
	 * the polled I/O switch.
	 */
	if (polled_io == NULL) {
		DPRINTF(DPRINT_L0,
		    "consconfig_setup_polledio: get_polledio failed\n");
		(void) ldi_close(lh, FREAD|FWRITE, kcred);
		return;
	}

	/* Initialize the polled input */
	polled_io_init();

	/* Register the callbacks */
	DPRINTF(DPRINT_L0,
	    "consconfig_setup_polledio: registering callbacks\n");
	(void) polled_io_register_callbacks(polled_io, 0);

	(void) ldi_close(lh, FREAD|FWRITE, kcred);

	DPRINTF(DPRINT_L0, "consconfig_setup_polledio: end\n");
}

static cons_state_t *
consconfig_state_init(void)
{
	cons_state_t	*sp;
	int		rval;

	/* Initialize console information */
	sp = kmem_zalloc(sizeof (cons_state_t), KM_SLEEP);
	sp->cons_keyboard_problem = B_FALSE;

	mutex_init(&sp->cons_lock, NULL, MUTEX_DRIVER, NULL);

	/* check if consconfig:usb_kb_path is set in /etc/system */
	consconfig_usb_kb_path = consconfig_get_usb_kb_path();

	/* check if consconfig:usb_ms_path is set in /etc/system */
	consconfig_usb_ms_path = consconfig_get_usb_ms_path();

	consconfig_print_paths();

	/* init external globals */
	stdoutdev = NODEV;

	/*
	 * Find keyboard, mouse, stdin and stdout devices, if they
	 * exist on this platform.
	 */

	if (consconfig_usb_kb_path != NULL) {
		sp->cons_keyboard_path = consconfig_usb_kb_path;
	} else if (usb_kb_path != NULL) {
		sp->cons_keyboard_path = usb_kb_path;
	} else {
		sp->cons_keyboard_path = plat_kbdpath();
	}

	if (consconfig_usb_ms_path != NULL) {
		sp->cons_mouse_path = consconfig_usb_ms_path;
	} else if (usb_ms_path != NULL) {
		sp->cons_mouse_path = usb_ms_path;
	} else {
		sp->cons_mouse_path = plat_mousepath();
	}

	/* Identify the stdout driver */
	sp->cons_stdout_path = plat_stdoutpath();
	sp->cons_stdout_is_fb = plat_stdout_is_framebuffer();

	sp->cons_stdin_is_kbd = plat_stdin_is_keyboard();

	if (sp->cons_stdin_is_kbd &&
	    (usb_kb_path != NULL || consconfig_usb_kb_path != NULL))  {
		sp->cons_stdin_path = sp->cons_keyboard_path;
	} else {
		/*
		 * The standard in device may or may not be the same as
		 * the keyboard. Even if the keyboard is not the
		 * standard input, the keyboard console stream will
		 * still be built if the keyboard alias provided by the
		 * firmware exists and is valid.
		 */
		sp->cons_stdin_path = plat_stdinpath();
	}

	if (sp->cons_stdout_is_fb) {
		sp->cons_fb_path = sp->cons_stdout_path;

#ifdef _HAVE_TEM_FIRMWARE
		sp->cons_tem_supported = consconfig_tem_supported(sp);

		/*
		 * Systems which offer a virtual console must use that
		 * as a fallback whenever the fb doesn't support tem.
		 * Such systems cannot render characters to the screen
		 * using OBP.
		 */
		if (!sp->cons_tem_supported) {
			char *path;

			if (plat_virtual_console_path(&path) >= 0) {
				sp->cons_stdin_is_kbd = 0;
				sp->cons_stdout_is_fb = 0;
				sp->cons_stdin_path = path;
				sp->cons_stdout_path = path;
				sp->cons_fb_path = plat_fbpath();

				cmn_err(CE_WARN,
				    "%s doesn't support terminal emulation "
				    "mode; switching to virtual console.",
				    sp->cons_fb_path);
			}
		}
#endif /* _HAVE_TEM_FIRMWARE */
	} else {
		sp->cons_fb_path = plat_fbpath();
#ifdef _HAVE_TEM_FIRMWARE
		sp->cons_tem_supported = consconfig_tem_supported(sp);
#endif /* _HAVE_TEM_FIRMWARE */
	}

	sp->cons_li = ldi_ident_from_anon();

	/* Save the pointer for retrieval by the dacf functions */
	rval = space_store("consconfig", (uintptr_t)sp);
	ASSERT(rval == 0);

	return (sp);
}

static int
consconfig_relink_wc(cons_state_t *sp, ldi_handle_t new_lh, int *muxid)
{
	int		err, rval;
	ldi_handle_t	wc_lh;
	dev_t		wc_dev;

	ASSERT(muxid != NULL);

	/*
	 * NOTE: we could be in a dacf callback context right now. normally
	 * it's not legal to call any ldi_open_*() function from this context
	 * because we're currently holding device tree locks and if the
	 * ldi_open_*() call could try to acquire other device tree locks
	 * (to attach the device we're trying to open.)  if this happens then
	 * we could deadlock.  To avoid this situation, during initialization
	 * we made sure to grab a hold on the dip of the device we plan to
	 * open so that it can never be detached.  Then we use
	 * ldi_open_by_dev() to actually open the device since it will see
	 * that the device is already attached and held and instead of
	 * acquire any locks it will only increase the reference count
	 * on the device.
	 */
	wc_dev = sp->cons_wc_vp->v_rdev;
	err = ldi_open_by_dev(&wc_dev, OTYP_CHR, FREAD|FWRITE|FNOCTTY,
	    kcred, &wc_lh, sp->cons_li);
	ASSERT(wc_dev == sp->cons_wc_vp->v_rdev);
	if (err) {
		cmn_err(CE_WARN, "consconfig_relink_wc: "
		    "unable to open wc device");
		return (err);
	}

	if (new_lh != NULL) {
		DPRINTF(DPRINT_L0, "linking stream under wc\n");

		err = ldi_ioctl(wc_lh, I_PLINK, (uintptr_t)new_lh,
		    FKIOCTL, kcred, muxid);
		if (err != 0) {
			cmn_err(CE_WARN, "consconfig_relink_wc: "
			    "wc link failed, error %d", err);
		}
	} else {
		DPRINTF(DPRINT_L0, "unlinking stream from under wc\n");

		err = ldi_ioctl(wc_lh, I_PUNLINK, *muxid,
		    FKIOCTL, kcred, &rval);
		if (err != 0) {
			cmn_err(CE_WARN, "consconfig_relink_wc: "
			    "wc unlink failed, error %d", err);
		} else {
			*muxid = -1;
		}
	}

	(void) ldi_close(wc_lh, FREAD|FWRITE, kcred);
	return (err);
}

static void
cons_build_upper_layer(cons_state_t *sp)
{
	ldi_handle_t		wc_lh;
	struct strioctl		strioc;
	int			rval;
	dev_t			dev;
	dev_t			wc_dev;

	/*
	 * Build the wc->conskbd portion of the keyboard console stream.
	 * Even if no keyboard is attached to the system, the upper
	 * layer of the stream will be built. If the user attaches
	 * a keyboard after the system is booted, the keyboard driver
	 * and module will be linked under conskbd.
	 *
	 * Errors are generally ignored here because conskbd and wc
	 * are pseudo drivers and should be present on the system.
	 */

	/* open the console keyboard device.  will never be closed */
	if (ldi_open_by_name(CONSKBD_PATH, FREAD|FWRITE|FNOCTTY,
	    kcred, &sp->conskbd_lh, sp->cons_li) != 0) {
		panic("consconfig: unable to open conskbd device");
		/*NOTREACHED*/
	}

	DPRINTF(DPRINT_L0, "conskbd_lh = %p\n", sp->conskbd_lh);

	/* open the console mouse device.  will never be closed */
	if (ldi_open_by_name(CONSMS_PATH, FREAD|FWRITE|FNOCTTY,
	    kcred, &sp->consms_lh, sp->cons_li) != 0) {
		panic("consconfig: unable to open consms device");
		/*NOTREACHED*/
	}

	DPRINTF(DPRINT_L0, "consms_lh = %p\n", sp->consms_lh);

	/*
	 * Get a vnode for the wc device and then grab a hold on the
	 * device dip so it can never detach.  We need to do this now
	 * because later we'll have to open the wc device in a context
	 * were it isn't safe to acquire any device tree locks (ie, during
	 * a dacf callback.)
	 */
	sp->cons_wc_vp = i_consconfig_createvp(WC_PATH);
	if (sp->cons_wc_vp == NULL)
		panic("consconfig: unable to find wc device");

	if (e_ddi_hold_devi_by_dev(sp->cons_wc_vp->v_rdev, 0) == NULL)
		panic("consconfig: unable to hold wc device");

	/*
	 * Build the wc->conskbd portion of the keyboard console stream.
	 * Even if no keyboard is attached to the system, the upper
	 * layer of the stream will be built. If the user attaches
	 * a keyboard after the system is booted, the keyboard driver
	 * and module will be linked under conskbd.
	 *
	 * The act of linking conskbd under wc will cause wc to
	 * query the lower layers about their polled I/O routines
	 * using CONSOPENPOLLEDIO.  This will fail on this link because
	 * there is not a physical keyboard linked under conskbd.
	 *
	 * Since conskbd and wc are pseudo drivers, errors are
	 * generally ignored when linking and unlinking them.
	 */
	(void) consconfig_relink_wc(sp, sp->conskbd_lh, &sp->conskbd_muxid);

	/*
	 * Get a vnode for the redirection device.  (It has the
	 * connection to the workstation console device wired into it,
	 * so that it's not necessary to establish the connection
	 * here.  If the redirection device is ever generalized to
	 * handle multiple client devices, it won't be able to
	 * establish the connection itself, and we'll have to do it
	 * here.)
	 */
	wsconsvp = i_consconfig_createvp(IWSCN_PATH);
	if (wsconsvp == NULL) {
		panic("consconfig: unable to find iwscn device");
		/*NOTREACHED*/
	}

	if (cons_tem_disable)
		return;

	if (sp->cons_fb_path == NULL) {
#if defined(__x86)
		if (sp->cons_stdout_is_fb)
			cmn_err(CE_WARN, "consconfig: no screen found");
#endif
		return;
	}

	/* make sure the frame buffer device exists */
	dev = ddi_pathname_to_dev_t(sp->cons_fb_path);
	if (dev == NODEV) {
		cmn_err(CE_WARN, "consconfig: "
		    "cannot find driver for screen device %s",
		    sp->cons_fb_path);
		return;
	}

#ifdef _HAVE_TEM_FIRMWARE
	/*
	 * If the underlying fb device doesn't support terminal emulation,
	 * we don't want to open the wc device (below) because it depends
	 * on features which aren't available (polled mode io).
	 */
	if (!sp->cons_tem_supported)
		return;
#endif /* _HAVE_TEM_FIRMWARE */

	/* tell wc to open the frame buffer device */
	wc_dev = sp->cons_wc_vp->v_rdev;
	if (ldi_open_by_dev(&wc_dev, OTYP_CHR, FREAD|FWRITE|FNOCTTY, kcred,
	    &wc_lh, sp->cons_li)) {
		cmn_err(CE_PANIC, "cons_build_upper_layer: "
		    "unable to open wc device");
		return;
	}
	ASSERT(wc_dev == sp->cons_wc_vp->v_rdev);

	strioc.ic_cmd = WC_OPEN_FB;
	strioc.ic_timout = INFTIM;
	strioc.ic_len = strlen(sp->cons_fb_path) + 1;
	strioc.ic_dp = sp->cons_fb_path;

	if (ldi_ioctl(wc_lh, I_STR, (intptr_t)&strioc,
	    FKIOCTL, kcred, &rval) == 0)
		consmode = CONS_KFB;
	else
		cmn_err(CE_WARN,
		    "consconfig: terminal emulator failed to initialize");
	(void) ldi_close(wc_lh, FREAD|FWRITE, kcred);
}

static void
consconfig_load_drivers(cons_state_t *sp)
{
	/*
	 * Calling ddi_pathname_to_dev_t causes the drivers to be loaded.
	 * The attaching of the drivers will cause the creation of the
	 * keyboard and mouse minor nodes, which will in turn trigger the
	 * dacf framework to call the keyboard and mouse configuration
	 * tasks.  See PSARC/1998/212 for more details about the dacf
	 * framework.
	 *
	 * on sparc, when the console is ttya, zs0 is stdin/stdout, and zs1
	 * is kb/mouse.  zs0 must be attached before zs1. The zs driver
	 * is written this way and the hardware may depend on this, too.
	 * It would be better to enforce this by attaching zs in sibling
	 * order with a driver property, such as ddi-attachall.
	 */
	if (sp->cons_stdin_path != NULL)
		stdindev = ddi_pathname_to_dev_t(sp->cons_stdin_path);
	if (stdindev == NODEV) {
		DPRINTF(DPRINT_L0,
		    "!fail to attach stdin: %s\n", sp->cons_stdin_path);
	}
	if (sp->cons_stdout_path != NULL)
		stdoutdev = ddi_pathname_to_dev_t(sp->cons_stdout_path);
	if (sp->cons_keyboard_path != NULL)
		kbddev = ddi_pathname_to_dev_t(sp->cons_keyboard_path);
	if (sp->cons_mouse_path != NULL)
		mousedev =  ddi_pathname_to_dev_t(sp->cons_mouse_path);

	/*
	 * On x86, make sure the fb driver is loaded even if we don't use it
	 * for the console. This will ensure that we create a /dev/fb link
	 * which is required to start Xorg.
	 */
#if defined(__x86)
	if (sp->cons_fb_path != NULL)
		fbdev = ddi_pathname_to_dev_t(sp->cons_fb_path);
#endif

	DPRINTF(DPRINT_L0, "stdindev %lx, stdoutdev %lx, kbddev %lx, "
	    "mousedev %lx\n", stdindev, stdoutdev, kbddev, mousedev);
}

static void
consconfig_init_framebuffer(cons_state_t *sp)
{
	if (!sp->cons_stdout_is_fb)
		return;

	DPRINTF(DPRINT_L0, "stdout is framebuffer\n");
	ASSERT(strcmp(sp->cons_fb_path, sp->cons_stdout_path) == 0);

	/*
	 * Console output is a framebuffer.
	 * Find the framebuffer driver if we can, and make
	 * ourselves a shadow vnode to track it with.
	 */
	fbdev = stdoutdev;
	if (fbdev == NODEV) {
		DPRINTF(DPRINT_L3,
		    "Can't find driver for console framebuffer\n");
	} else {
		/* stdoutdev is valid, of fbvp should exist */
		fbvp = i_consconfig_createvp(sp->cons_stdout_path);
		if (fbvp == NULL) {
			panic("consconfig_load_drivers: "
			    "unable to find frame buffer device");
			/*NOTREACHED*/
		}
		ASSERT(fbvp->v_rdev == fbdev);

		/* console device is never released */
		fbdip = e_ddi_hold_devi_by_dev(fbdev, 0);
	}
	pm_cfb_setup(sp->cons_stdout_path);
}

/*
 * consconfig_prepare_dev:
 * 	Flush the stream, push "pushmod" onto the stream.
 * 	for keyboard, issue the KIOCTRANSABLE ioctl, and
 *	possible enable abort.
 */
static void
consconfig_prepare_dev(
    ldi_handle_t	new_lh,
    const char		*pushmod,
    int			kbdtranslatable,
    int			input_type,
    int			dev_type)
{
	int err, rval;

	/* send a flush down the stream to the keyboard driver */
	(void) ldi_ioctl(new_lh, I_FLUSH, (intptr_t)FLUSHRW,
	    FKIOCTL, kcred, &rval);

	if (pushmod) {
		err = ldi_ioctl(new_lh, I_PUSH, (intptr_t)pushmod,
		    FKIOCTL, kcred, &rval);
		if (err) {
			cmn_err(CE_WARN, "consconfig_prepare_dev: "
			    "can't push streams module \"%s\", error %d",
			    pushmod, err);
		}
	}

	if (dev_type == CONS_MS)
		return;

	ASSERT(dev_type == CONS_KBD);

	err = ldi_ioctl(new_lh, KIOCTRANSABLE,
	    (intptr_t)&kbdtranslatable, FKIOCTL, kcred, &rval);
	if (err) {
		cmn_err(CE_WARN, "consconfig_prepare_dev: "
		    "KIOCTRANSABLE failed, error: %d", err);
	}

	/*
	 * During boot, dynamic_console_config() will call the
	 * function to enable abort on the console.  If the
	 * keyboard is hotplugged after boot, check to see if
	 * the keyboard is the console input.  If it is
	 * enable abort on it.
	 */
	if (input_type == CONSOLE_LOCAL)
		(void) consconfig_kbd_abort_enable(new_lh);
}

/*
 * consconfig_relink_conskbd:
 * 	If new_lh is not NULL it should represent a driver with a
 * 	keyboard module pushed on top of it. The driver is then linked
 * 	underneath conskbd.  the resulting stream will be
 *	wc->conskbd->"new_lh driver".
 *
 * 	If new_lh is NULL, then an unlink operation is done on conskbd
 * 	that attempts to unlink the stream specified by *muxid.
 *	the resulting stream will be wc->conskbd.
 */
static int
consconfig_relink_conskbd(cons_state_t *sp, ldi_handle_t new_lh, int *muxid)
{
	int		err, rval;
	int		conskbd_relink = 0;

	ASSERT(muxid != NULL);

	DPRINTF(DPRINT_L0, "consconfig_relink_conskbd: "
	    "conskbd_lh = %p, new_lh = %p,  muxid = %x\n",
	    sp->conskbd_lh, new_lh, *muxid);

	/*
	 * If conskbd is linked under wc then temporarily unlink it
	 * from under wc so that the new_lh stream may be linked under
	 * conskbd.  This has to be done because streams are built bottom
	 * up and linking a stream under conskbd isn't allowed when
	 * conskbd is linked under wc.
	 */
	if (sp->conskbd_muxid != -1) {
		DPRINTF(DPRINT_L0, "unlinking conskbd from under wc\n");
		conskbd_relink = 1;
		err = consconfig_relink_wc(sp, NULL, &sp->conskbd_muxid);
		if (err) {
			cmn_err(CE_WARN, "consconfig_relink_conskbd: "
			    "wc unlink failed, error %d", err);
			return (err);
		}
	}

	if (new_lh != NULL) {
		DPRINTF(DPRINT_L0, "linking keyboard under conskbd\n");

		/* Link the stream represented by new_lh under conskbd */
		err = ldi_ioctl(sp->conskbd_lh, I_PLINK, (uintptr_t)new_lh,
		    FKIOCTL, kcred, muxid);
		if (err != 0) {
			cmn_err(CE_WARN, "consconfig_relink_conskbd: "
			    "conskbd link failed, error %d", err);
			goto relink_failed;
		}
	} else {
		DPRINTF(DPRINT_L0, "unlinking keyboard from under conskbd\n");

		/*
		 * This will cause the keyboard driver to be closed,
		 * all modules to be popped, and the keyboard vnode released.
		 */
		err = ldi_ioctl(sp->conskbd_lh, I_PUNLINK, *muxid,
		    FKIOCTL, kcred, &rval);
		if (err != 0) {
			cmn_err(CE_WARN, "consconfig_relink_conskbd: "
			    "conskbd unlink failed, error %d", err);
			goto relink_failed;
		} else {
			*muxid = -1;
		}

		consconfig_check_phys_kbd(sp);
	}

	if (!conskbd_relink)
		return (err);

	/*
	 * Link consbkd back under wc.
	 *
	 * The act of linking conskbd back under wc will cause wc
	 * to query the lower lower layers about their polled I/O
	 * routines.  This time the request will succeed because there
	 * is a physical keyboard linked under conskbd.
	 */
	DPRINTF(DPRINT_L0, "re-linking conskbd under wc\n");
	err = consconfig_relink_wc(sp, sp->conskbd_lh, &sp->conskbd_muxid);
	if (err) {
		cmn_err(CE_WARN, "consconfig_relink_conskbd: "
		    "wc link failed, error %d", err);
	}
	return (err);

relink_failed:
	if (!conskbd_relink)