freebsd-dev/sys/dev/syscons/schistory.c
Peter Wemm f457830b8e de-count schistory.c. The handling of NSC was rather bogus here and was
little more than a place holder, because nothing actually counted the
number of 'sc' units to compare it against NSC.  A bit more work here
is needed so that the scaling of SC_MAX_HISTORY_SIZE and extra_history_size
goes up when more sc units are added.  But, it does not appear that we can
have more than one console yet, so it does not seem particularly urgent.
2002-08-19 23:56:01 +00:00

323 lines
8.5 KiB
C

/*-
* Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
* Copyright (c) 1992-1998 Søren Schmidt
* 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,
* without modification, immediately at the beginning of the file.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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 "opt_syscons.h"
#ifndef SC_NO_HISTORY
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/consio.h>
#include <sys/tty.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <machine/pc/display.h>
#include <dev/syscons/syscons.h>
/*
* XXX Placeholder.
* This calculations should be dynamically scaled by number of seperate sc
* devices. A base value of 'extra_history_size' should be defined for
* each syscons unit, and added and subtracted from the dynamic
* 'extra_history_size' as units are added and removed. This way, each time
* a new syscons unit goes online, extra_history_size is automatically bumped.
*/
#define MAXSC 1
#if !defined(SC_MAX_HISTORY_SIZE)
#define SC_MAX_HISTORY_SIZE (1000 * MAXCONS * MAXSC)
#endif
#if !defined(SC_HISTORY_SIZE)
#define SC_HISTORY_SIZE (ROW * 4)
#endif
#if (SC_HISTORY_SIZE * MAXCONS * MAXSC) > SC_MAX_HISTORY_SIZE
#undef SC_MAX_HISTORY_SIZE
#define SC_MAX_HISTORY_SIZE (SC_HISTORY_SIZE * MAXCONS * MAXSC)
#endif
/* local variables */
static int extra_history_size
= SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS;
/* local functions */
static void copy_history(sc_vtb_t *from, sc_vtb_t *to);
static void history_to_screen(scr_stat *scp);
/* allocate a history buffer */
int
sc_alloc_history_buffer(scr_stat *scp, int lines, int prev_ysize, int wait)
{
/*
* syscons unconditionally allocates buffers upto
* SC_HISTORY_SIZE lines or scp->ysize lines, whichever
* is larger. A value greater than that is allowed,
* subject to extra_history_size.
*/
sc_vtb_t *history;
sc_vtb_t *prev_history;
int cur_lines; /* current buffer size */
int min_lines; /* guaranteed buffer size */
int delta; /* lines to put back */
if (lines <= 0)
lines = SC_HISTORY_SIZE; /* use the default value */
/* make it at least as large as the screen size */
lines = imax(lines, scp->ysize);
/* remove the history buffer while we update it */
history = prev_history = scp->history;
scp->history = NULL;
/* calculate the amount of lines to put back to extra_history_size */
delta = 0;
if (prev_history) {
cur_lines = sc_vtb_rows(history);
min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
if (cur_lines > min_lines)
delta = cur_lines - min_lines;
}
/* lines upto min_lines are always allowed. */
min_lines = imax(SC_HISTORY_SIZE, scp->ysize);
if (lines > min_lines) {
if (lines - min_lines > extra_history_size + delta) {
/* too many lines are requested */
scp->history = prev_history;
return EINVAL;
}
}
/* allocate a new buffer */
history = (sc_vtb_t *)malloc(sizeof(*history),
M_DEVBUF,
(wait) ? M_WAITOK : M_NOWAIT);
if (history != NULL) {
if (lines > min_lines)
extra_history_size -= lines - min_lines;
/* XXX error check? */
sc_vtb_init(history, VTB_RINGBUFFER, scp->xsize, lines,
NULL, wait);
/* FIXME: XXX no good? */
sc_vtb_clear(history, scp->sc->scr_map[0x20],
SC_NORM_ATTR << 8);
if (prev_history != NULL)
copy_history(prev_history, history);
scp->history_pos = sc_vtb_tail(history);
} else {
scp->history_pos = 0;
}
/* destroy the previous buffer */
if (prev_history != NULL) {
extra_history_size += delta;
sc_vtb_destroy(prev_history);
free(prev_history, M_DEVBUF);
}
scp->history = history;
return 0;
}
static void
copy_history(sc_vtb_t *from, sc_vtb_t *to)
{
int lines;
int cols;
int cols1;
int cols2;
int pos;
int i;
lines = sc_vtb_rows(from);
cols1 = sc_vtb_cols(from);
cols2 = sc_vtb_cols(to);
cols = imin(cols1, cols2);
pos = sc_vtb_tail(from);
for (i = 0; i < lines; ++i) {
sc_vtb_append(from, pos, to, cols);
if (cols < cols2)
sc_vtb_seek(to, sc_vtb_pos(to,
sc_vtb_tail(to),
cols2 - cols));
pos = sc_vtb_pos(from, pos, cols1);
}
}
void
sc_free_history_buffer(scr_stat *scp, int prev_ysize)
{
sc_vtb_t *history;
int cur_lines; /* current buffer size */
int min_lines; /* guaranteed buffer size */
history = scp->history;
scp->history = NULL;
if (history == NULL)
return;
cur_lines = sc_vtb_rows(history);
min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
extra_history_size += (cur_lines > min_lines) ?
cur_lines - min_lines : 0;
sc_vtb_destroy(history);
free(history, M_DEVBUF);
}
/* copy entire screen into the top of the history buffer */
void
sc_hist_save(scr_stat *scp)
{
sc_vtb_append(&scp->vtb, 0, scp->history, scp->xsize*scp->ysize);
scp->history_pos = sc_vtb_tail(scp->history);
}
/* restore the screen by copying from the history buffer */
int
sc_hist_restore(scr_stat *scp)
{
int ret;
if (scp->history_pos != sc_vtb_tail(scp->history)) {
scp->history_pos = sc_vtb_tail(scp->history);
history_to_screen(scp);
ret = 0;
} else {
ret = 1;
}
sc_vtb_seek(scp->history, sc_vtb_pos(scp->history,
sc_vtb_tail(scp->history),
-scp->xsize*scp->ysize));
return ret;
}
/* copy screen-full of saved lines */
static void
history_to_screen(scr_stat *scp)
{
int pos;
int i;
pos = scp->history_pos;
for (i = 1; i <= scp->ysize; ++i) {
pos = sc_vtb_pos(scp->history, pos, -scp->xsize);
sc_vtb_copy(scp->history, pos,
&scp->vtb, scp->xsize*(scp->ysize - i),
scp->xsize);
}
mark_all(scp);
}
/* go to the tail of the history buffer */
void
sc_hist_home(scr_stat *scp)
{
scp->history_pos = sc_vtb_tail(scp->history);
history_to_screen(scp);
}
/* go to the top of the history buffer */
void
sc_hist_end(scr_stat *scp)
{
scp->history_pos = sc_vtb_pos(scp->history, sc_vtb_tail(scp->history),
scp->xsize*scp->ysize);
history_to_screen(scp);
}
/* move one line up */
int
sc_hist_up_line(scr_stat *scp)
{
if (sc_vtb_pos(scp->history, scp->history_pos, -(scp->xsize*scp->ysize))
== sc_vtb_tail(scp->history))
return -1;
scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
-scp->xsize);
history_to_screen(scp);
return 0;
}
/* move one line down */
int
sc_hist_down_line(scr_stat *scp)
{
if (scp->history_pos == sc_vtb_tail(scp->history))
return -1;
scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
scp->xsize);
history_to_screen(scp);
return 0;
}
int
sc_hist_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
struct thread *td)
{
scr_stat *scp;
int error;
switch (cmd) {
case CONS_HISTORY: /* set history size */
scp = SC_STAT(tp->t_dev);
if (*(int *)data <= 0)
return EINVAL;
if (scp->status & BUFFER_SAVED)
return EBUSY;
DPRINTF(5, ("lines:%d, ysize:%d, pool:%d\n",
*(int *)data, scp->ysize, extra_history_size));
error = sc_alloc_history_buffer(scp,
imax(*(int *)data, scp->ysize),
scp->ysize, TRUE);
DPRINTF(5, ("error:%d, rows:%d, pool:%d\n", error,
sc_vtb_rows(scp->history), extra_history_size));
return error;
case CONS_CLRHIST:
scp = SC_STAT(tp->t_dev);
sc_vtb_clear(scp->history, scp->sc->scr_map[0x20],
SC_NORM_ATTR << 8);
return 0;
}
return ENOIOCTL;
}
#endif /* SC_NO_HISTORY */