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-rw-r--r--sys/kern/tty_cons.c597
1 files changed, 597 insertions, 0 deletions
diff --git a/sys/kern/tty_cons.c b/sys/kern/tty_cons.c
new file mode 100644
index 0000000..91713c1
--- /dev/null
+++ b/sys/kern/tty_cons.c
@@ -0,0 +1,597 @@
+/*
+ * 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
+ * $FreeBSD$
+ */
+
+#include "opt_ddb.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/cons.h>
+#include <sys/fcntl.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/namei.h>
+#include <sys/proc.h>
+#include <sys/queue.h>
+#include <sys/reboot.h>
+#include <sys/sysctl.h>
+#include <sys/tty.h>
+#include <sys/uio.h>
+#include <sys/vnode.h>
+
+#include <ddb/ddb.h>
+
+#include <machine/cpu.h>
+
+static d_open_t cnopen;
+static d_close_t cnclose;
+static d_read_t cnread;
+static d_write_t cnwrite;
+static d_ioctl_t cnioctl;
+static d_poll_t cnpoll;
+static d_kqfilter_t cnkqfilter;
+
+#define CDEV_MAJOR 0
+static struct cdevsw cn_cdevsw = {
+ /* open */ cnopen,
+ /* close */ cnclose,
+ /* read */ cnread,
+ /* write */ cnwrite,
+ /* ioctl */ cnioctl,
+ /* poll */ cnpoll,
+ /* mmap */ nommap,
+ /* strategy */ nostrategy,
+ /* name */ "console",
+ /* maj */ CDEV_MAJOR,
+ /* dump */ nodump,
+ /* psize */ nopsize,
+ /* flags */ D_TTY | D_KQFILTER,
+ /* kqfilter */ cnkqfilter,
+};
+
+struct cn_device {
+ STAILQ_ENTRY(cn_device) cnd_next;
+ char cnd_name[16];
+ struct vnode *cnd_vp;
+ struct consdev *cnd_cn;
+};
+
+#define CNDEVPATHMAX 32
+#define CNDEVTAB_SIZE 4
+static struct cn_device cn_devtab[CNDEVTAB_SIZE];
+static STAILQ_HEAD(, cn_device) cn_devlist =
+ STAILQ_HEAD_INITIALIZER(cn_devlist);
+
+#define CND_INVALID(cnd, td) \
+ (cnd == NULL || cnd->cnd_vp == NULL || \
+ (cnd->cnd_vp->v_type == VBAD && !cn_devopen(cnd, td, 1)))
+
+static udev_t cn_udev_t;
+SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD,
+ &cn_udev_t, sizeof cn_udev_t, "T,dev_t", "");
+
+int cons_unavail = 0; /* XXX:
+ * physical console not available for
+ * input (i.e., it is in graphics mode)
+ */
+static int cn_mute;
+static int openflag; /* how /dev/console was opened */
+static int cn_is_open;
+static dev_t cn_devfsdev; /* represents the device private info */
+static u_char console_pausing; /* pause after each line during probe */
+static char *console_pausestr=
+"<pause; press any key to proceed to next line or '.' to end pause mode>";
+
+void cndebug(char *);
+
+CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
+SET_DECLARE(cons_set, struct consdev);
+
+void
+cninit(void)
+{
+ struct consdev *best_cn, *cn, **list;
+
+ /*
+ * Check if we should mute the console (for security reasons perhaps)
+ * It can be changes dynamically using sysctl kern.consmute
+ * once we are up and going.
+ *
+ */
+ cn_mute = ((boothowto & (RB_MUTE
+ |RB_SINGLE
+ |RB_VERBOSE
+ |RB_ASKNAME
+ |RB_CONFIG)) == RB_MUTE);
+
+ /*
+ * Find the first console with the highest priority.
+ */
+ best_cn = NULL;
+ SET_FOREACH(list, cons_set) {
+ cn = *list;
+ if (cn->cn_probe == NULL)
+ continue;
+ cn->cn_probe(cn);
+ if (cn->cn_pri == CN_DEAD)
+ continue;
+ if (best_cn == NULL || cn->cn_pri > best_cn->cn_pri)
+ best_cn = cn;
+ if (boothowto & RB_MULTIPLE) {
+ /*
+ * Initialize console, and attach to it.
+ */
+ cnadd(cn);
+ cn->cn_init(cn);
+ }
+ }
+ if (best_cn == NULL)
+ return;
+ if ((boothowto & RB_MULTIPLE) == 0) {
+ cnadd(best_cn);
+ best_cn->cn_init(best_cn);
+ }
+ if (boothowto & RB_PAUSE)
+ console_pausing = 1;
+ /*
+ * Make the best console the preferred console.
+ */
+ cnselect(best_cn);
+}
+
+void
+cninit_finish()
+{
+ console_pausing = 0;
+}
+
+/* add a new physical console to back the virtual console */
+int
+cnadd(struct consdev *cn)
+{
+ struct cn_device *cnd;
+ int i;
+
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
+ if (cnd->cnd_cn == cn)
+ return (0);
+ for (i = 0; i < CNDEVTAB_SIZE; i++) {
+ cnd = &cn_devtab[i];
+ if (cnd->cnd_cn == NULL)
+ break;
+ }
+ if (cnd->cnd_cn != NULL)
+ return (ENOMEM);
+ cnd->cnd_cn = cn;
+ STAILQ_INSERT_TAIL(&cn_devlist, cnd, cnd_next);
+ return (0);
+}
+
+void
+cnremove(struct consdev *cn)
+{
+ struct cn_device *cnd;
+
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
+ if (cnd->cnd_cn != cn)
+ continue;
+ STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next);
+ if (cnd->cnd_vp != NULL)
+ vn_close(cnd->cnd_vp, openflag, NOCRED, NULL);
+ cnd->cnd_vp = NULL;
+ cnd->cnd_cn = NULL;
+ cnd->cnd_name[0] = '\0';
+#if 0
+ /*
+ * XXX
+ * syscons gets really confused if console resources are
+ * freed after the system has initialized.
+ */
+ if (cn->cn_term != NULL)
+ cn->cn_term(cn);
+#endif
+ return;
+ }
+}
+
+void
+cnselect(struct consdev *cn)
+{
+ struct cn_device *cnd;
+
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
+ if (cnd->cnd_cn != cn)
+ continue;
+ if (cnd == STAILQ_FIRST(&cn_devlist))
+ return;
+ STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next);
+ STAILQ_INSERT_HEAD(&cn_devlist, cnd, cnd_next);
+ return;
+ }
+}
+
+void
+cndebug(char *str)
+{
+ int i, len;
+
+ len = strlen(str);
+ cnputc('>'); cnputc('>'); cnputc('>'); cnputc(' ');
+ for (i = 0; i < len; i++)
+ cnputc(str[i]);
+ cnputc('\n');
+}
+
+static int
+sysctl_kern_console(SYSCTL_HANDLER_ARGS)
+{
+ struct cn_device *cnd;
+ struct consdev *cp, **list;
+ char *name, *p;
+ int delete, len, error;
+
+ len = 2;
+ SET_FOREACH(list, cons_set) {
+ cp = *list;
+ if (cp->cn_dev != NULL)
+ len += strlen(devtoname(cp->cn_dev)) + 1;
+ }
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
+ len += strlen(devtoname(cnd->cnd_cn->cn_dev)) + 1;
+ len = len > CNDEVPATHMAX ? len : CNDEVPATHMAX;
+ MALLOC(name, char *, len, M_TEMP, M_WAITOK | M_ZERO);
+ p = name;
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
+ p += sprintf(p, "%s,", devtoname(cnd->cnd_cn->cn_dev));
+ *p++ = '/';
+ SET_FOREACH(list, cons_set) {
+ cp = *list;
+ if (cp->cn_dev != NULL)
+ p += sprintf(p, "%s,", devtoname(cp->cn_dev));
+ }
+ error = sysctl_handle_string(oidp, name, len, req);
+ if (error == 0 && req->newptr != NULL) {
+ p = name;
+ error = ENXIO;
+ delete = 0;
+ if (*p == '-') {
+ delete = 1;
+ p++;
+ }
+ SET_FOREACH(list, cons_set) {
+ cp = *list;
+ if (cp->cn_dev == NULL ||
+ strcmp(p, devtoname(cp->cn_dev)) != 0)
+ continue;
+ if (delete) {
+ cnremove(cp);
+ error = 0;
+ } else {
+ error = cnadd(cp);
+ if (error == 0)
+ cnselect(cp);
+ }
+ break;
+ }
+ }
+ FREE(name, M_TEMP);
+ return (error);
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, console, CTLTYPE_STRING|CTLFLAG_RW,
+ 0, 0, sysctl_kern_console, "A", "Console device control");
+
+/*
+ * User has changed the state of the console muting.
+ * This may require us to open or close the device in question.
+ */
+static int
+sysctl_kern_consmute(SYSCTL_HANDLER_ARGS)
+{
+ int error;
+ int ocn_mute;
+
+ ocn_mute = cn_mute;
+ error = sysctl_handle_int(oidp, &cn_mute, 0, req);
+ if (error != 0 || req->newptr == NULL)
+ return (error);
+ if (ocn_mute && !cn_mute && cn_is_open)
+ error = cnopen(NODEV, openflag, 0, curthread);
+ else if (!ocn_mute && cn_mute && cn_is_open) {
+ error = cnclose(NODEV, openflag, 0, curthread);
+ cn_is_open = 1; /* XXX hack */
+ }
+ return (error);
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW,
+ 0, sizeof(cn_mute), sysctl_kern_consmute, "I", "");
+
+static int
+cn_devopen(struct cn_device *cnd, struct thread *td, int forceopen)
+{
+ char path[CNDEVPATHMAX];
+ struct nameidata nd;
+ struct vnode *vp;
+ dev_t dev;
+ int error;
+
+ if ((vp = cnd->cnd_vp) != NULL) {
+ if (!forceopen && vp->v_type != VBAD) {
+ dev = vp->v_rdev;
+ return ((*devsw(dev)->d_open)(dev, openflag, 0, td));
+ }
+ cnd->cnd_vp = NULL;
+ vn_close(vp, openflag, td->td_ucred, td);
+ }
+ if (cnd->cnd_name[0] == '\0')
+ strncpy(cnd->cnd_name, devtoname(cnd->cnd_cn->cn_dev),
+ sizeof(cnd->cnd_name));
+ snprintf(path, sizeof(path), "/dev/%s", cnd->cnd_name);
+ NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path, td);
+ error = vn_open(&nd, &openflag, 0);
+ if (error == 0) {
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ VOP_UNLOCK(nd.ni_vp, 0, td);
+ if (nd.ni_vp->v_type == VCHR)
+ cnd->cnd_vp = nd.ni_vp;
+ else
+ vn_close(nd.ni_vp, openflag, td->td_ucred, td);
+ }
+ return (cnd->cnd_vp != NULL);
+}
+
+static int
+cnopen(dev_t dev, int flag, int mode, struct thread *td)
+{
+ struct cn_device *cnd;
+
+ openflag = flag | FWRITE; /* XXX */
+ cn_is_open = 1; /* console is logically open */
+ if (cn_mute)
+ return (0);
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
+ cn_devopen(cnd, td, 0);
+ return (0);
+}
+
+static int
+cnclose(dev_t dev, int flag, int mode, struct thread *td)
+{
+ struct cn_device *cnd;
+ struct vnode *vp;
+
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
+ if ((vp = cnd->cnd_vp) == NULL)
+ continue;
+ cnd->cnd_vp = NULL;
+ vn_close(vp, openflag, td->td_ucred, td);
+ }
+ cn_is_open = 0;
+ return (0);
+}
+
+static int
+cnread(dev_t dev, struct uio *uio, int flag)
+{
+ struct cn_device *cnd;
+
+ cnd = STAILQ_FIRST(&cn_devlist);
+ if (cn_mute || CND_INVALID(cnd, curthread))
+ return (0);
+ dev = cnd->cnd_vp->v_rdev;
+ return ((*devsw(dev)->d_read)(dev, uio, flag));
+}
+
+static int
+cnwrite(dev_t dev, struct uio *uio, int flag)
+{
+ struct cn_device *cnd;
+
+ cnd = STAILQ_FIRST(&cn_devlist);
+ if (cn_mute || CND_INVALID(cnd, curthread))
+ goto done;
+ if (constty)
+ dev = constty->t_dev;
+ else
+ dev = cnd->cnd_vp->v_rdev;
+ if (dev != NULL) {
+ log_console(uio);
+ return ((*devsw(dev)->d_write)(dev, uio, flag));
+ }
+done:
+ uio->uio_resid = 0; /* dump the data */
+ return (0);
+}
+
+static int
+cnioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td)
+{
+ struct cn_device *cnd;
+ int error;
+
+ cnd = STAILQ_FIRST(&cn_devlist);
+ if (cn_mute || CND_INVALID(cnd, td))
+ return (0);
+ /*
+ * Superuser can always use this to wrest control of console
+ * output from the "virtual" console.
+ */
+ if (cmd == TIOCCONS && constty) {
+ error = suser(td);
+ if (error)
+ return (error);
+ constty = NULL;
+ return (0);
+ }
+ dev = cnd->cnd_vp->v_rdev;
+ if (dev != NULL)
+ return ((*devsw(dev)->d_ioctl)(dev, cmd, data, flag, td));
+ return (0);
+}
+
+/*
+ * XXX
+ * poll/kqfilter do not appear to be correct
+ */
+static int
+cnpoll(dev_t dev, int events, struct thread *td)
+{
+ struct cn_device *cnd;
+
+ cnd = STAILQ_FIRST(&cn_devlist);
+ if (cn_mute || CND_INVALID(cnd, td))
+ return (0);
+ dev = cnd->cnd_vp->v_rdev;
+ if (dev != NULL)
+ return ((*devsw(dev)->d_poll)(dev, events, td));
+ return (0);
+}
+
+static int
+cnkqfilter(dev_t dev, struct knote *kn)
+{
+ struct cn_device *cnd;
+
+ cnd = STAILQ_FIRST(&cn_devlist);
+ if (cn_mute || CND_INVALID(cnd, curthread))
+ return (1);
+ dev = cnd->cnd_vp->v_rdev;
+ if (dev != NULL)
+ return ((*devsw(dev)->d_kqfilter)(dev, kn));
+ return (1);
+}
+
+/*
+ * Low level console routines.
+ */
+int
+cngetc(void)
+{
+ int c;
+
+ if (cn_mute)
+ return (-1);
+ while ((c = cncheckc()) == -1)
+ ;
+ if (c == '\r')
+ c = '\n'; /* console input is always ICRNL */
+ return (c);
+}
+
+int
+cncheckc(void)
+{
+ struct cn_device *cnd;
+ struct consdev *cn;
+ int c;
+
+ if (cn_mute)
+ return (-1);
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
+ cn = cnd->cnd_cn;
+ c = cn->cn_checkc(cn->cn_dev);
+ if (c != -1) {
+ return (c);
+ }
+ }
+ return (-1);
+}
+
+void
+cnputc(int c)
+{
+ struct cn_device *cnd;
+ struct consdev *cn;
+ char *cp;
+
+ if (cn_mute || c == '\0')
+ return;
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
+ cn = cnd->cnd_cn;
+ if (c == '\n')
+ cn->cn_putc(cn->cn_dev, '\r');
+ cn->cn_putc(cn->cn_dev, c);
+ }
+#ifdef DDB
+ if (console_pausing && !db_active && (c == '\n')) {
+#else
+ if (console_pausing && (c == '\n')) {
+#endif
+ for (cp = console_pausestr; *cp != '\0'; cp++)
+ cnputc(*cp);
+ if (cngetc() == '.')
+ console_pausing = 0;
+ cnputc('\r');
+ for (cp = console_pausestr; *cp != '\0'; cp++)
+ cnputc(' ');
+ cnputc('\r');
+ }
+}
+
+void
+cndbctl(int on)
+{
+ struct cn_device *cnd;
+ struct consdev *cn;
+ static int refcount;
+
+ if (!on)
+ refcount--;
+ if (refcount == 0)
+ STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
+ cn = cnd->cnd_cn;
+ if (cn->cn_dbctl != NULL)
+ cn->cn_dbctl(cn->cn_dev, on);
+ }
+ if (on)
+ refcount++;
+}
+
+static void
+cn_drvinit(void *unused)
+{
+
+ cn_devfsdev = make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
+ "console");
+}
+
+SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)
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