freebsd-skq/sys/dev/bvm/bvm_console.c
Pedro F. Giffuni 718cf2ccb9 sys/dev: further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 14:52:40 +00:00

240 lines
4.8 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``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 NETAPP, INC 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/cons.h>
#include <sys/tty.h>
#include <sys/reboot.h>
#include <sys/bus.h>
#include <sys/kdb.h>
#include <ddb/ddb.h>
#ifndef BVMCONS_POLL_HZ
#define BVMCONS_POLL_HZ 4
#endif
#define BVMBURSTLEN 16 /* max number of bytes to write in one chunk */
static tsw_open_t bvm_tty_open;
static tsw_close_t bvm_tty_close;
static tsw_outwakeup_t bvm_tty_outwakeup;
static struct ttydevsw bvm_ttydevsw = {
.tsw_flags = TF_NOPREFIX,
.tsw_open = bvm_tty_open,
.tsw_close = bvm_tty_close,
.tsw_outwakeup = bvm_tty_outwakeup,
};
static int polltime;
static struct callout bvm_timer;
#if defined(KDB)
static int alt_break_state;
#endif
#define BVM_CONS_PORT 0x220
static int bvm_cons_port = BVM_CONS_PORT;
#define BVM_CONS_SIG ('b' << 8 | 'v')
static void bvm_timeout(void *);
static cn_probe_t bvm_cnprobe;
static cn_init_t bvm_cninit;
static cn_term_t bvm_cnterm;
static cn_getc_t bvm_cngetc;
static cn_putc_t bvm_cnputc;
static cn_grab_t bvm_cngrab;
static cn_ungrab_t bvm_cnungrab;
CONSOLE_DRIVER(bvm);
static int
bvm_rcons(u_char *ch)
{
int c;
c = inl(bvm_cons_port);
if (c != -1) {
*ch = (u_char)c;
return (0);
} else
return (-1);
}
static void
bvm_wcons(u_char ch)
{
outl(bvm_cons_port, ch);
}
static void
cn_drvinit(void *unused)
{
struct tty *tp;
if (bvm_consdev.cn_pri != CN_DEAD) {
tp = tty_alloc(&bvm_ttydevsw, NULL);
callout_init_mtx(&bvm_timer, tty_getlock(tp), 0);
tty_makedev(tp, NULL, "bvmcons");
}
}
static int
bvm_tty_open(struct tty *tp)
{
polltime = hz / BVMCONS_POLL_HZ;
if (polltime < 1)
polltime = 1;
callout_reset(&bvm_timer, polltime, bvm_timeout, tp);
return (0);
}
static void
bvm_tty_close(struct tty *tp)
{
tty_lock_assert(tp, MA_OWNED);
callout_stop(&bvm_timer);
}
static void
bvm_tty_outwakeup(struct tty *tp)
{
int len, written;
u_char buf[BVMBURSTLEN];
for (;;) {
len = ttydisc_getc(tp, buf, sizeof(buf));
if (len == 0)
break;
written = 0;
while (written < len)
bvm_wcons(buf[written++]);
}
}
static void
bvm_timeout(void *v)
{
struct tty *tp;
int c;
tp = (struct tty *)v;
tty_lock_assert(tp, MA_OWNED);
while ((c = bvm_cngetc(NULL)) != -1)
ttydisc_rint(tp, c, 0);
ttydisc_rint_done(tp);
callout_reset(&bvm_timer, polltime, bvm_timeout, tp);
}
static void
bvm_cnprobe(struct consdev *cp)
{
int disabled, port;
disabled = 0;
cp->cn_pri = CN_DEAD;
strcpy(cp->cn_name, "bvmcons");
resource_int_value("bvmconsole", 0, "disabled", &disabled);
if (!disabled) {
if (resource_int_value("bvmconsole", 0, "port", &port) == 0)
bvm_cons_port = port;
if (inw(bvm_cons_port) == BVM_CONS_SIG)
cp->cn_pri = CN_REMOTE;
}
}
static void
bvm_cninit(struct consdev *cp)
{
int i;
const char *bootmsg = "Using bvm console.\n";
if (boothowto & RB_VERBOSE) {
for (i = 0; i < strlen(bootmsg); i++)
bvm_cnputc(cp, bootmsg[i]);
}
}
static void
bvm_cnterm(struct consdev *cp)
{
}
static int
bvm_cngetc(struct consdev *cp)
{
unsigned char ch;
if (bvm_rcons(&ch) == 0) {
#if defined(KDB)
kdb_alt_break(ch, &alt_break_state);
#endif
return (ch);
}
return (-1);
}
static void
bvm_cnputc(struct consdev *cp, int c)
{
bvm_wcons(c);
}
static void
bvm_cngrab(struct consdev *cp)
{
}
static void
bvm_cnungrab(struct consdev *cp)
{
}
SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);