freebsd-skq/sys/kern/kern_cons.c

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
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* Copyright (c) 1988 University of Utah.
* Copyright (c) 1991 The Regents of the University of California.
* Copyright (c) 1999 Michael Smith
* Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
*
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* 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. Neither the name of the University nor the names of its contributors
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* 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
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*/
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_syscons.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/conf.h>
#include <sys/cons.h>
#include <sys/fcntl.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/msgbuf.h>
#include <sys/namei.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/reboot.h>
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#include <sys/sysctl.h>
#include <sys/sbuf.h>
#include <sys/tty.h>
#include <sys/uio.h>
#include <sys/vnode.h>
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#include <ddb/ddb.h>
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#include <machine/cpu.h>
The "free-lance" timer in the i8254 is only used for the speaker these days, so de-generalize the acquire_timer/release_timer api to just deal with speakers. The new (optional) MD functions are: timer_spkr_acquire() timer_spkr_release() and timer_spkr_setfreq() the last of which configures the timer to generate a tone of a given frequency, in Hz instead of 1/1193182th of seconds. Drop entirely timer2 on pc98, it is not used anywhere at all. Move sysbeep() to kern/tty_cons.c and use the timer_spkr*() if they exist, and do nothing otherwise. Remove prototypes and empty acquire-/release-timer() and sysbeep() functions from the non-beeping archs. This eliminate the need for the speaker driver to know about i8254frequency at all. In theory this makes the speaker driver MI, contingent on the timer_spkr_*() functions existing but the driver does not know this yet and still attaches to the ISA bus. Syscons is more tricky, in one function, sc_tone(), it knows the hz and things are just fine. In the other function, sc_bell() it seems to get the period from the KDMKTONE ioctl in terms if 1/1193182th second, so we hardcode the 1193182 and leave it at that. It's probably not important. Change a few other sysbeep() uses which obviously knew that the argument was in terms of i8254 frequency, and leave alone those that look like people thought sysbeep() took frequency in hertz. This eliminates the knowledge of i8254_freq from all but the actual clock.c code and the prof_machdep.c on amd64 and i386, where I think it would be smart to ask for help from the timecounters anyway [TBD].
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#include <machine/clock.h>
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static MALLOC_DEFINE(M_TTYCONS, "tty console", "tty console handling");
struct cn_device {
STAILQ_ENTRY(cn_device) cnd_next;
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);
int cons_avail_mask = 0; /* Bit mask. Each registered low level console
* which is currently unavailable for inpit
* (i.e., if it is in graphics mode) will have
* this bit cleared.
*/
static int cn_mute;
static char *consbuf; /* buffer used by `consmsgbuf' */
static struct callout conscallout; /* callout for outputting to constty */
struct msgbuf consmsgbuf; /* message buffer for console tty */
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>";
struct tty *constty; /* pointer to console "window" tty */
static struct mtx cnputs_mtx; /* Mutex for cnputs(). */
static int use_cnputs_mtx = 0; /* != 0 if cnputs_mtx locking reqd. */
static void constty_timeout(void *arg);
static struct consdev cons_consdev;
DATA_SET(cons_set, cons_consdev);
SET_DECLARE(cons_set, struct consdev);
void
cninit(void)
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{
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_MUTE);
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/*
* Find the first console with the highest priority.
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*/
best_cn = NULL;
SET_FOREACH(list, cons_set) {
cn = *list;
cnremove(cn);
Allow multiple console devices per driver without insane code duplication. Say, a driver wants to have multiple console devices to pick from, you would normally write down something like this: CONSOLE_DRIVER(dev1); CONSOLE_DRIVER(dev2); Unfortunately, this means that you have to declare 10 cn routines, instead of 5. It also isn't possible to initialize cn_arg on beforehand. I noticed this restriction when I was implementing some of the console bits for my vt(4) driver in my newcons branch. I have a single set of cn routines (termcn_*) which are shared by all vt(4) console devices. In order to solve this, I'm adding a separate consdev_ops structure, which contains all the function pointers. This structure is referenced through consdev's cn_ops field. While there, I'm removing CONS_DRIVER() and cn_checkc, which have been deprecated for years. They weren't used throughout the source, until the Xen console driver showed up. CONSOLE_DRIVER() has been changed to do the right thing. It now declares both the consdev and consdev_ops structure and ties them together. In other words: this change doesn't change the KPI for drivers that used the regular way of declaring console devices. If drivers want to use multiple console devices, they can do this as follows: static const struct consdev_ops mydriver_cnops = { .cn_probe = mydriver_cnprobe, ... }; static struct mydriver_softc cons0_softc = { ... }; CONSOLE_DEVICE(cons0, mydriver_cnops, &cons0_softc); static struct mydriver_softc cons1_softc = { ... }; CONSOLE_DEVICE(cons1, mydriver_cnops, &cons1_softc); Obtained from: //depot/user/ed/newcons/...
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/* Skip cons_consdev. */
if (cn->cn_ops == NULL)
continue;
Allow multiple console devices per driver without insane code duplication. Say, a driver wants to have multiple console devices to pick from, you would normally write down something like this: CONSOLE_DRIVER(dev1); CONSOLE_DRIVER(dev2); Unfortunately, this means that you have to declare 10 cn routines, instead of 5. It also isn't possible to initialize cn_arg on beforehand. I noticed this restriction when I was implementing some of the console bits for my vt(4) driver in my newcons branch. I have a single set of cn routines (termcn_*) which are shared by all vt(4) console devices. In order to solve this, I'm adding a separate consdev_ops structure, which contains all the function pointers. This structure is referenced through consdev's cn_ops field. While there, I'm removing CONS_DRIVER() and cn_checkc, which have been deprecated for years. They weren't used throughout the source, until the Xen console driver showed up. CONSOLE_DRIVER() has been changed to do the right thing. It now declares both the consdev and consdev_ops structure and ties them together. In other words: this change doesn't change the KPI for drivers that used the regular way of declaring console devices. If drivers want to use multiple console devices, they can do this as follows: static const struct consdev_ops mydriver_cnops = { .cn_probe = mydriver_cnprobe, ... }; static struct mydriver_softc cons0_softc = { ... }; CONSOLE_DEVICE(cons0, mydriver_cnops, &cons0_softc); static struct mydriver_softc cons1_softc = { ... }; CONSOLE_DEVICE(cons1, mydriver_cnops, &cons1_softc); Obtained from: //depot/user/ed/newcons/...
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cn->cn_ops->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.
*/
Allow multiple console devices per driver without insane code duplication. Say, a driver wants to have multiple console devices to pick from, you would normally write down something like this: CONSOLE_DRIVER(dev1); CONSOLE_DRIVER(dev2); Unfortunately, this means that you have to declare 10 cn routines, instead of 5. It also isn't possible to initialize cn_arg on beforehand. I noticed this restriction when I was implementing some of the console bits for my vt(4) driver in my newcons branch. I have a single set of cn routines (termcn_*) which are shared by all vt(4) console devices. In order to solve this, I'm adding a separate consdev_ops structure, which contains all the function pointers. This structure is referenced through consdev's cn_ops field. While there, I'm removing CONS_DRIVER() and cn_checkc, which have been deprecated for years. They weren't used throughout the source, until the Xen console driver showed up. CONSOLE_DRIVER() has been changed to do the right thing. It now declares both the consdev and consdev_ops structure and ties them together. In other words: this change doesn't change the KPI for drivers that used the regular way of declaring console devices. If drivers want to use multiple console devices, they can do this as follows: static const struct consdev_ops mydriver_cnops = { .cn_probe = mydriver_cnprobe, ... }; static struct mydriver_softc cons0_softc = { ... }; CONSOLE_DEVICE(cons0, mydriver_cnops, &cons0_softc); static struct mydriver_softc cons1_softc = { ... }; CONSOLE_DEVICE(cons1, mydriver_cnops, &cons1_softc); Obtained from: //depot/user/ed/newcons/...
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cn->cn_ops->cn_init(cn);
cnadd(cn);
}
}
if (best_cn == NULL)
return;
if ((boothowto & RB_MULTIPLE) == 0) {
Allow multiple console devices per driver without insane code duplication. Say, a driver wants to have multiple console devices to pick from, you would normally write down something like this: CONSOLE_DRIVER(dev1); CONSOLE_DRIVER(dev2); Unfortunately, this means that you have to declare 10 cn routines, instead of 5. It also isn't possible to initialize cn_arg on beforehand. I noticed this restriction when I was implementing some of the console bits for my vt(4) driver in my newcons branch. I have a single set of cn routines (termcn_*) which are shared by all vt(4) console devices. In order to solve this, I'm adding a separate consdev_ops structure, which contains all the function pointers. This structure is referenced through consdev's cn_ops field. While there, I'm removing CONS_DRIVER() and cn_checkc, which have been deprecated for years. They weren't used throughout the source, until the Xen console driver showed up. CONSOLE_DRIVER() has been changed to do the right thing. It now declares both the consdev and consdev_ops structure and ties them together. In other words: this change doesn't change the KPI for drivers that used the regular way of declaring console devices. If drivers want to use multiple console devices, they can do this as follows: static const struct consdev_ops mydriver_cnops = { .cn_probe = mydriver_cnprobe, ... }; static struct mydriver_softc cons0_softc = { ... }; CONSOLE_DEVICE(cons0, mydriver_cnops, &cons0_softc); static struct mydriver_softc cons1_softc = { ... }; CONSOLE_DEVICE(cons1, mydriver_cnops, &cons1_softc); Obtained from: //depot/user/ed/newcons/...
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best_cn->cn_ops->cn_init(best_cn);
cnadd(best_cn);
}
if (boothowto & RB_PAUSE)
console_pausing = 1;
/*
* Make the best console the preferred console.
*/
cnselect(best_cn);
#ifdef EARLY_PRINTF
/*
* Release early console.
*/
early_putc = NULL;
#endif
}
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;
The second phase of syscons reorganization. - Split syscons source code into manageable chunks and reorganize some of complicated functions. - Many static variables are moved to the softc structure. - Added a new key function, PREV. When this key is pressed, the vty immediately before the current vty will become foreground. Analogue to PREV, which is usually assigned to the PrntScrn key. PR: kern/10113 Submitted by: Christian Weisgerber <naddy@mips.rhein-neckar.de> - Modified the kernel console input function sccngetc() so that it handles function keys properly. - Reorganized the screen update routine. - VT switching code is reorganized. It now should be slightly more robust than before. - Added the DEVICE_RESUME function so that syscons no longer hooks the APM resume event directly. - New kernel configuration options: SC_NO_CUTPASTE, SC_NO_FONT_LOADING, SC_NO_HISTORY and SC_NO_SYSMOUSE. Various parts of syscons can be omitted so that the kernel size is reduced. SC_PIXEL_MODE Made the VESA 800x600 mode an option, rather than a standard part of syscons. SC_DISABLE_DDBKEY Disables the `debug' key combination. SC_ALT_MOUSE_IMAGE Inverse the character cell at the mouse cursor position in the text console, rather than drawing an arrow on the screen. Submitted by: Nick Hibma (n_hibma@FreeBSD.ORG) SC_DFLT_FONT makeoptions "SC_DFLT_FONT=_font_name_" Include the named font as the default font of syscons. 16-line, 14-line and 8-line font data will be compiled in. This option replaces the existing STD8X16FONT option, which loads 16-line font data only. - The VGA driver is split into /sys/dev/fb/vga.c and /sys/isa/vga_isa.c. - The video driver provides a set of ioctl commands to manipulate the frame buffer. - New kernel configuration option: VGA_WIDTH90 Enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60. These modes are mot always supported by the video card. PR: i386/7510 Submitted by: kbyanc@freedomnet.com and alexv@sui.gda.itesm.mx. - The header file machine/console.h is reorganized; its contents is now split into sys/fbio.h, sys/kbio.h (a new file) and sys/consio.h (another new file). machine/console.h is still maintained for compatibility reasons. - Kernel console selection/installation routines are fixed and slightly rebumped so that it should now be possible to switch between the interanl kernel console (sc or vt) and a remote kernel console (sio) again, as it was in 2.x, 3.0 and 3.1. - Screen savers and splash screen decoders Because of the header file reorganization described above, screen savers and splash screen decoders are slightly modified. After this update, /sys/modules/syscons/saver.h is no longer necessary and is removed.
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}
if (cnd->cnd_cn != NULL)
return (ENOMEM);
cnd->cnd_cn = cn;
if (cn->cn_name[0] == '\0') {
/* XXX: it is unclear if/where this print might output */
printf("WARNING: console at %p has no name\n", cn);
}
STAILQ_INSERT_TAIL(&cn_devlist, cnd, cnd_next);
if (STAILQ_FIRST(&cn_devlist) == cnd)
ttyconsdev_select(cnd->cnd_cn->cn_name);
/* Add device to the active mask. */
cnavailable(cn, (cn->cn_flags & CN_FLAG_NOAVAIL) == 0);
return (0);
}
void
cnremove(struct consdev *cn)
{
struct cn_device *cnd;
int i;
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
if (cnd->cnd_cn != cn)
continue;
if (STAILQ_FIRST(&cn_devlist) == cnd)
ttyconsdev_select(NULL);
STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next);
cnd->cnd_cn = NULL;
/* Remove this device from available mask. */
for (i = 0; i < CNDEVTAB_SIZE; i++)
if (cnd == &cn_devtab[i]) {
cons_avail_mask &= ~(1 << i);
break;
}
#if 0
/*
* XXX
* syscons gets really confused if console resources are
* freed after the system has initialized.
*/
if (cn->cn_term != NULL)
Allow multiple console devices per driver without insane code duplication. Say, a driver wants to have multiple console devices to pick from, you would normally write down something like this: CONSOLE_DRIVER(dev1); CONSOLE_DRIVER(dev2); Unfortunately, this means that you have to declare 10 cn routines, instead of 5. It also isn't possible to initialize cn_arg on beforehand. I noticed this restriction when I was implementing some of the console bits for my vt(4) driver in my newcons branch. I have a single set of cn routines (termcn_*) which are shared by all vt(4) console devices. In order to solve this, I'm adding a separate consdev_ops structure, which contains all the function pointers. This structure is referenced through consdev's cn_ops field. While there, I'm removing CONS_DRIVER() and cn_checkc, which have been deprecated for years. They weren't used throughout the source, until the Xen console driver showed up. CONSOLE_DRIVER() has been changed to do the right thing. It now declares both the consdev and consdev_ops structure and ties them together. In other words: this change doesn't change the KPI for drivers that used the regular way of declaring console devices. If drivers want to use multiple console devices, they can do this as follows: static const struct consdev_ops mydriver_cnops = { .cn_probe = mydriver_cnprobe, ... }; static struct mydriver_softc cons0_softc = { ... }; CONSOLE_DEVICE(cons0, mydriver_cnops, &cons0_softc); static struct mydriver_softc cons1_softc = { ... }; CONSOLE_DEVICE(cons1, mydriver_cnops, &cons1_softc); Obtained from: //depot/user/ed/newcons/...
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cn->cn_ops->cn_term(cn);
#endif
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return;
}
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}
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);
ttyconsdev_select(cnd->cnd_cn->cn_name);
return;
}
}
void
cnavailable(struct consdev *cn, int available)
{
int i;
for (i = 0; i < CNDEVTAB_SIZE; i++) {
if (cn_devtab[i].cnd_cn == cn)
break;
}
if (available) {
if (i < CNDEVTAB_SIZE)
cons_avail_mask |= (1 << i);
cn->cn_flags &= ~CN_FLAG_NOAVAIL;
} else {
if (i < CNDEVTAB_SIZE)
cons_avail_mask &= ~(1 << i);
cn->cn_flags |= CN_FLAG_NOAVAIL;
}
}
int
cnunavailable(void)
{
return (cons_avail_mask == 0);
}
/*
* sysctl_kern_console() provides output parseable in conscontrol(1).
*/
static int
sysctl_kern_console(SYSCTL_HANDLER_ARGS)
{
struct cn_device *cnd;
struct consdev *cp, **list;
char *p;
int delete, error;
struct sbuf *sb;
sb = sbuf_new(NULL, NULL, CNDEVPATHMAX * 2, SBUF_AUTOEXTEND |
SBUF_INCLUDENUL);
if (sb == NULL)
return (ENOMEM);
sbuf_clear(sb);
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next)
sbuf_printf(sb, "%s,", cnd->cnd_cn->cn_name);
sbuf_printf(sb, "/");
SET_FOREACH(list, cons_set) {
cp = *list;
if (cp->cn_name[0] != '\0')
sbuf_printf(sb, "%s,", cp->cn_name);
}
sbuf_finish(sb);
error = sysctl_handle_string(oidp, sbuf_data(sb), sbuf_len(sb), req);
if (error == 0 && req->newptr != NULL) {
p = sbuf_data(sb);
error = ENXIO;
delete = 0;
if (*p == '-') {
delete = 1;
p++;
}
SET_FOREACH(list, cons_set) {
cp = *list;
if (strcmp(p, cp->cn_name) != 0)
continue;
if (delete) {
cnremove(cp);
error = 0;
} else {
error = cnadd(cp);
if (error == 0)
cnselect(cp);
}
break;
}
}
sbuf_delete(sb);
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;
error = sysctl_handle_int(oidp, &cn_mute, 0, req);
if (error != 0 || req->newptr == NULL)
return (error);
return (error);
}
SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW,
0, sizeof(cn_mute), sysctl_kern_consmute, "I",
"State of the console muting");
void
cngrab()
{
struct cn_device *cnd;
struct consdev *cn;
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
cn = cnd->cnd_cn;
if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG))
cn->cn_ops->cn_grab(cn);
}
}
void
cnungrab()
{
struct cn_device *cnd;
struct consdev *cn;
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
cn = cnd->cnd_cn;
if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG))
cn->cn_ops->cn_ungrab(cn);
}
}
void
cnresume()
{
struct cn_device *cnd;
struct consdev *cn;
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
cn = cnd->cnd_cn;
if (cn->cn_ops->cn_resume != NULL)
cn->cn_ops->cn_resume(cn);
}
}
/*
* Low level console routines.
*/
int
cngetc(void)
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{
int c;
if (cn_mute)
return (-1);
while ((c = cncheckc()) == -1)
cpu_spinwait();
if (c == '\r')
c = '\n'; /* console input is always ICRNL */
return (c);
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}
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;
if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG)) {
Allow multiple console devices per driver without insane code duplication. Say, a driver wants to have multiple console devices to pick from, you would normally write down something like this: CONSOLE_DRIVER(dev1); CONSOLE_DRIVER(dev2); Unfortunately, this means that you have to declare 10 cn routines, instead of 5. It also isn't possible to initialize cn_arg on beforehand. I noticed this restriction when I was implementing some of the console bits for my vt(4) driver in my newcons branch. I have a single set of cn routines (termcn_*) which are shared by all vt(4) console devices. In order to solve this, I'm adding a separate consdev_ops structure, which contains all the function pointers. This structure is referenced through consdev's cn_ops field. While there, I'm removing CONS_DRIVER() and cn_checkc, which have been deprecated for years. They weren't used throughout the source, until the Xen console driver showed up. CONSOLE_DRIVER() has been changed to do the right thing. It now declares both the consdev and consdev_ops structure and ties them together. In other words: this change doesn't change the KPI for drivers that used the regular way of declaring console devices. If drivers want to use multiple console devices, they can do this as follows: static const struct consdev_ops mydriver_cnops = { .cn_probe = mydriver_cnprobe, ... }; static struct mydriver_softc cons0_softc = { ... }; CONSOLE_DEVICE(cons0, mydriver_cnops, &cons0_softc); static struct mydriver_softc cons1_softc = { ... }; CONSOLE_DEVICE(cons1, mydriver_cnops, &cons1_softc); Obtained from: //depot/user/ed/newcons/...
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c = cn->cn_ops->cn_getc(cn);
if (c != -1)
return (c);
}
}
return (-1);
}
void
cngets(char *cp, size_t size, int visible)
{
char *lp, *end;
int c;
cngrab();
lp = cp;
end = cp + size - 1;
for (;;) {
c = cngetc() & 0177;
switch (c) {
case '\n':
case '\r':
cnputc(c);
*lp = '\0';
cnungrab();
return;
case '\b':
case '\177':
if (lp > cp) {
if (visible)
cnputs("\b \b");
lp--;
}
continue;
case '\0':
continue;
default:
if (lp < end) {
switch (visible) {
case GETS_NOECHO:
break;
case GETS_ECHOPASS:
cnputc('*');
break;
default:
cnputc(c);
break;
}
*lp++ = c;
}
}
}
}
void
cnputc(int c)
1993-06-12 14:58:17 +00:00
{
struct cn_device *cnd;
struct consdev *cn;
char *cp;
#ifdef EARLY_PRINTF
if (early_putc != NULL) {
if (c == '\n')
early_putc('\r');
early_putc(c);
return;
}
#endif
if (cn_mute || c == '\0')
1993-06-12 14:58:17 +00:00
return;
STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) {
cn = cnd->cnd_cn;
if (!kdb_active || !(cn->cn_flags & CN_FLAG_NODEBUG)) {
if (c == '\n')
Allow multiple console devices per driver without insane code duplication. Say, a driver wants to have multiple console devices to pick from, you would normally write down something like this: CONSOLE_DRIVER(dev1); CONSOLE_DRIVER(dev2); Unfortunately, this means that you have to declare 10 cn routines, instead of 5. It also isn't possible to initialize cn_arg on beforehand. I noticed this restriction when I was implementing some of the console bits for my vt(4) driver in my newcons branch. I have a single set of cn routines (termcn_*) which are shared by all vt(4) console devices. In order to solve this, I'm adding a separate consdev_ops structure, which contains all the function pointers. This structure is referenced through consdev's cn_ops field. While there, I'm removing CONS_DRIVER() and cn_checkc, which have been deprecated for years. They weren't used throughout the source, until the Xen console driver showed up. CONSOLE_DRIVER() has been changed to do the right thing. It now declares both the consdev and consdev_ops structure and ties them together. In other words: this change doesn't change the KPI for drivers that used the regular way of declaring console devices. If drivers want to use multiple console devices, they can do this as follows: static const struct consdev_ops mydriver_cnops = { .cn_probe = mydriver_cnprobe, ... }; static struct mydriver_softc cons0_softc = { ... }; CONSOLE_DEVICE(cons0, mydriver_cnops, &cons0_softc); static struct mydriver_softc cons1_softc = { ... }; CONSOLE_DEVICE(cons1, mydriver_cnops, &cons1_softc); Obtained from: //depot/user/ed/newcons/...
2009-08-24 10:53:30 +00:00
cn->cn_ops->cn_putc(cn, '\r');
cn->cn_ops->cn_putc(cn, c);
}
1993-06-12 14:58:17 +00:00
}
if (console_pausing && c == '\n' && !kdb_active) {
for (cp = console_pausestr; *cp != '\0'; cp++)
cnputc(*cp);
cngrab();
if (cngetc() == '.')
console_pausing = 0;
cnungrab();
cnputc('\r');
for (cp = console_pausestr; *cp != '\0'; cp++)
cnputc(' ');
cnputc('\r');
}
1993-06-12 14:58:17 +00:00
}
void
cnputs(char *p)
{
int c;
int unlock_reqd = 0;
if (use_cnputs_mtx) {
/*
* NOTE: Debug prints and/or witness printouts in
* console driver clients can cause the "cnputs_mtx"
* mutex to recurse. Simply return if that happens.
*/
if (mtx_owned(&cnputs_mtx))
return;
mtx_lock_spin(&cnputs_mtx);
unlock_reqd = 1;
}
while ((c = *p++) != '\0')
cnputc(c);
if (unlock_reqd)
mtx_unlock_spin(&cnputs_mtx);
}
static int consmsgbuf_size = 8192;
SYSCTL_INT(_kern, OID_AUTO, consmsgbuf_size, CTLFLAG_RW, &consmsgbuf_size, 0,
"Console tty buffer size");
/*
* Redirect console output to a tty.
*/
void
constty_set(struct tty *tp)
{
int size;
KASSERT(tp != NULL, ("constty_set: NULL tp"));
if (consbuf == NULL) {
size = consmsgbuf_size;
consbuf = malloc(size, M_TTYCONS, M_WAITOK);
msgbuf_init(&consmsgbuf, consbuf, size);
callout_init(&conscallout, 0);
}
constty = tp;
constty_timeout(NULL);
}
/*
* Disable console redirection to a tty.
*/
void
constty_clear(void)
{
int c;
constty = NULL;
if (consbuf == NULL)
return;
callout_stop(&conscallout);
while ((c = msgbuf_getchar(&consmsgbuf)) != -1)
cnputc(c);
free(consbuf, M_TTYCONS);
consbuf = NULL;
}
/* Times per second to check for pending console tty messages. */
static int constty_wakeups_per_second = 5;
SYSCTL_INT(_kern, OID_AUTO, constty_wakeups_per_second, CTLFLAG_RW,
&constty_wakeups_per_second, 0,
"Times per second to check for pending console tty messages");
static void
constty_timeout(void *arg)
{
int c;
Integrate the new MPSAFE TTY layer to the FreeBSD operating system. The last half year I've been working on a replacement TTY layer for the FreeBSD kernel. The new TTY layer was designed to improve the following: - Improved driver model: The old TTY layer has a driver model that is not abstract enough to make it friendly to use. A good example is the output path, where the device drivers directly access the output buffers. This means that an in-kernel PPP implementation must always convert network buffers into TTY buffers. If a PPP implementation would be built on top of the new TTY layer (still needs a hooks layer, though), it would allow the PPP implementation to directly hand the data to the TTY driver. - Improved hotplugging: With the old TTY layer, it isn't entirely safe to destroy TTY's from the system. This implementation has a two-step destructing design, where the driver first abandons the TTY. After all threads have left the TTY, the TTY layer calls a routine in the driver, which can be used to free resources (unit numbers, etc). The pts(4) driver also implements this feature, which means posix_openpt() will now return PTY's that are created on the fly. - Improved performance: One of the major improvements is the per-TTY mutex, which is expected to improve scalability when compared to the old Giant locking. Another change is the unbuffered copying to userspace, which is both used on TTY device nodes and PTY masters. Upgrading should be quite straightforward. Unlike previous versions, existing kernel configuration files do not need to be changed, except when they reference device drivers that are listed in UPDATING. Obtained from: //depot/projects/mpsafetty/... Approved by: philip (ex-mentor) Discussed: on the lists, at BSDCan, at the DevSummit Sponsored by: Snow B.V., the Netherlands dcons(4) fixed by: kan
2008-08-20 08:31:58 +00:00
if (constty != NULL) {
tty_lock(constty);
while ((c = msgbuf_getchar(&consmsgbuf)) != -1) {
if (tty_putchar(constty, c) < 0) {
tty_unlock(constty);
constty = NULL;
break;
}
}
if (constty != NULL)
tty_unlock(constty);
}
if (constty != NULL) {
callout_reset(&conscallout, hz / constty_wakeups_per_second,
constty_timeout, NULL);
} else {
/* Deallocate the constty buffer memory. */
constty_clear();
}
}
static void
cn_drvinit(void *unused)
{
mtx_init(&cnputs_mtx, "cnputs_mtx", NULL, MTX_SPIN | MTX_NOWITNESS);
use_cnputs_mtx = 1;
}
SYSINIT(cndev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, cn_drvinit, NULL);
The "free-lance" timer in the i8254 is only used for the speaker these days, so de-generalize the acquire_timer/release_timer api to just deal with speakers. The new (optional) MD functions are: timer_spkr_acquire() timer_spkr_release() and timer_spkr_setfreq() the last of which configures the timer to generate a tone of a given frequency, in Hz instead of 1/1193182th of seconds. Drop entirely timer2 on pc98, it is not used anywhere at all. Move sysbeep() to kern/tty_cons.c and use the timer_spkr*() if they exist, and do nothing otherwise. Remove prototypes and empty acquire-/release-timer() and sysbeep() functions from the non-beeping archs. This eliminate the need for the speaker driver to know about i8254frequency at all. In theory this makes the speaker driver MI, contingent on the timer_spkr_*() functions existing but the driver does not know this yet and still attaches to the ISA bus. Syscons is more tricky, in one function, sc_tone(), it knows the hz and things are just fine. In the other function, sc_bell() it seems to get the period from the KDMKTONE ioctl in terms if 1/1193182th second, so we hardcode the 1193182 and leave it at that. It's probably not important. Change a few other sysbeep() uses which obviously knew that the argument was in terms of i8254 frequency, and leave alone those that look like people thought sysbeep() took frequency in hertz. This eliminates the knowledge of i8254_freq from all but the actual clock.c code and the prof_machdep.c on amd64 and i386, where I think it would be smart to ask for help from the timecounters anyway [TBD].
2008-03-26 20:09:21 +00:00
/*
* Sysbeep(), if we have hardware for it
*/
#ifdef HAS_TIMER_SPKR
static int beeping;
2014-09-22 14:27:26 +00:00
static struct callout beeping_timer;
The "free-lance" timer in the i8254 is only used for the speaker these days, so de-generalize the acquire_timer/release_timer api to just deal with speakers. The new (optional) MD functions are: timer_spkr_acquire() timer_spkr_release() and timer_spkr_setfreq() the last of which configures the timer to generate a tone of a given frequency, in Hz instead of 1/1193182th of seconds. Drop entirely timer2 on pc98, it is not used anywhere at all. Move sysbeep() to kern/tty_cons.c and use the timer_spkr*() if they exist, and do nothing otherwise. Remove prototypes and empty acquire-/release-timer() and sysbeep() functions from the non-beeping archs. This eliminate the need for the speaker driver to know about i8254frequency at all. In theory this makes the speaker driver MI, contingent on the timer_spkr_*() functions existing but the driver does not know this yet and still attaches to the ISA bus. Syscons is more tricky, in one function, sc_tone(), it knows the hz and things are just fine. In the other function, sc_bell() it seems to get the period from the KDMKTONE ioctl in terms if 1/1193182th second, so we hardcode the 1193182 and leave it at that. It's probably not important. Change a few other sysbeep() uses which obviously knew that the argument was in terms of i8254 frequency, and leave alone those that look like people thought sysbeep() took frequency in hertz. This eliminates the knowledge of i8254_freq from all but the actual clock.c code and the prof_machdep.c on amd64 and i386, where I think it would be smart to ask for help from the timecounters anyway [TBD].
2008-03-26 20:09:21 +00:00
static void
sysbeepstop(void *chan)
{
timer_spkr_release();
beeping = 0;
}
int
sysbeep(int pitch, int period)
{
if (timer_spkr_acquire()) {
if (!beeping) {
/* Something else owns it. */
return (EBUSY);
}
}
timer_spkr_setfreq(pitch);
if (!beeping) {
beeping = period;
2014-09-22 14:27:26 +00:00
callout_reset(&beeping_timer, period, sysbeepstop, NULL);
The "free-lance" timer in the i8254 is only used for the speaker these days, so de-generalize the acquire_timer/release_timer api to just deal with speakers. The new (optional) MD functions are: timer_spkr_acquire() timer_spkr_release() and timer_spkr_setfreq() the last of which configures the timer to generate a tone of a given frequency, in Hz instead of 1/1193182th of seconds. Drop entirely timer2 on pc98, it is not used anywhere at all. Move sysbeep() to kern/tty_cons.c and use the timer_spkr*() if they exist, and do nothing otherwise. Remove prototypes and empty acquire-/release-timer() and sysbeep() functions from the non-beeping archs. This eliminate the need for the speaker driver to know about i8254frequency at all. In theory this makes the speaker driver MI, contingent on the timer_spkr_*() functions existing but the driver does not know this yet and still attaches to the ISA bus. Syscons is more tricky, in one function, sc_tone(), it knows the hz and things are just fine. In the other function, sc_bell() it seems to get the period from the KDMKTONE ioctl in terms if 1/1193182th second, so we hardcode the 1193182 and leave it at that. It's probably not important. Change a few other sysbeep() uses which obviously knew that the argument was in terms of i8254 frequency, and leave alone those that look like people thought sysbeep() took frequency in hertz. This eliminates the knowledge of i8254_freq from all but the actual clock.c code and the prof_machdep.c on amd64 and i386, where I think it would be smart to ask for help from the timecounters anyway [TBD].
2008-03-26 20:09:21 +00:00
}
return (0);
}
2014-09-22 14:27:26 +00:00
static void
sysbeep_init(void *unused)
{
callout_init(&beeping_timer, 1);
2014-09-22 14:27:26 +00:00
}
SYSINIT(sysbeep, SI_SUB_SOFTINTR, SI_ORDER_ANY, sysbeep_init, NULL);
The "free-lance" timer in the i8254 is only used for the speaker these days, so de-generalize the acquire_timer/release_timer api to just deal with speakers. The new (optional) MD functions are: timer_spkr_acquire() timer_spkr_release() and timer_spkr_setfreq() the last of which configures the timer to generate a tone of a given frequency, in Hz instead of 1/1193182th of seconds. Drop entirely timer2 on pc98, it is not used anywhere at all. Move sysbeep() to kern/tty_cons.c and use the timer_spkr*() if they exist, and do nothing otherwise. Remove prototypes and empty acquire-/release-timer() and sysbeep() functions from the non-beeping archs. This eliminate the need for the speaker driver to know about i8254frequency at all. In theory this makes the speaker driver MI, contingent on the timer_spkr_*() functions existing but the driver does not know this yet and still attaches to the ISA bus. Syscons is more tricky, in one function, sc_tone(), it knows the hz and things are just fine. In the other function, sc_bell() it seems to get the period from the KDMKTONE ioctl in terms if 1/1193182th second, so we hardcode the 1193182 and leave it at that. It's probably not important. Change a few other sysbeep() uses which obviously knew that the argument was in terms of i8254 frequency, and leave alone those that look like people thought sysbeep() took frequency in hertz. This eliminates the knowledge of i8254_freq from all but the actual clock.c code and the prof_machdep.c on amd64 and i386, where I think it would be smart to ask for help from the timecounters anyway [TBD].
2008-03-26 20:09:21 +00:00
#else
/*
* No hardware, no sound
*/
int
sysbeep(int pitch __unused, int period __unused)
{
return (ENODEV);
}
#endif
/*
* Temporary support for sc(4) to vt(4) transition.
*/
static unsigned vty_prefer;
static char vty_name[16];
SYSCTL_STRING(_kern, OID_AUTO, vty, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, vty_name,
0, "Console vty driver");
int
vty_enabled(unsigned vty)
{
static unsigned vty_selected = 0;
if (vty_selected == 0) {
TUNABLE_STR_FETCH("kern.vty", vty_name, sizeof(vty_name));
do {
#if defined(DEV_SC)
if (strcmp(vty_name, "sc") == 0) {
vty_selected = VTY_SC;
break;
}
#endif
#if defined(DEV_VT)
if (strcmp(vty_name, "vt") == 0) {
vty_selected = VTY_VT;
break;
}
#endif
if (vty_prefer != 0) {
vty_selected = vty_prefer;
break;
}
#if defined(DEV_VT)
vty_selected = VTY_VT;
#elif defined(DEV_SC)
vty_selected = VTY_SC;
#endif
} while (0);
if (vty_selected == VTY_VT)
strcpy(vty_name, "vt");
else if (vty_selected == VTY_SC)
strcpy(vty_name, "sc");
}
return ((vty_selected & vty) != 0);
}
void
vty_set_preferred(unsigned vty)
{
vty_prefer = vty;
#if !defined(DEV_SC)
vty_prefer &= ~VTY_SC;
#endif
#if !defined(DEV_VT)
vty_prefer &= ~VTY_VT;
#endif
}