2 * Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
3 * Copyright (c) 1992-1998 Søren Schmidt
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer,
11 * without modification, immediately at the beginning of the file.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 * $FreeBSD: src/sys/dev/syscons/schistory.c,v 1.8.2.1 2001/07/19 06:38:53 dd Exp $
30 * $DragonFly: src/sys/dev/misc/syscons/schistory.c,v 1.8 2006/09/05 00:55:38 dillon Exp $
34 #include "opt_syscons.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
42 #include <sys/kernel.h>
44 #include <machine/console.h>
45 #include <machine/pc/display.h>
49 #if !defined(SC_MAX_HISTORY_SIZE)
50 #define SC_MAX_HISTORY_SIZE (1000 * MAXCONS * NSC)
53 #if !defined(SC_HISTORY_SIZE)
54 #define SC_HISTORY_SIZE (ROW * 4)
57 #if (SC_HISTORY_SIZE * MAXCONS * NSC) > SC_MAX_HISTORY_SIZE
58 #undef SC_MAX_HISTORY_SIZE
59 #define SC_MAX_HISTORY_SIZE (SC_HISTORY_SIZE * MAXCONS * NSC)
63 static int extra_history_size
64 = SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS;
67 static void copy_history(sc_vtb_t *from, sc_vtb_t *to);
68 static void history_to_screen(scr_stat *scp);
69 static void history_to_screen_lines(scr_stat *scp, int cnt);
71 /* allocate a history buffer */
73 sc_alloc_history_buffer(scr_stat *scp, int lines, int prev_ysize, int wait)
76 * syscons unconditionally allocates buffers upto
77 * SC_HISTORY_SIZE lines or scp->ysize lines, whichever
78 * is larger. A value greater than that is allowed,
79 * subject to extra_history_size.
82 sc_vtb_t *prev_history;
83 int cur_lines; /* current buffer size */
84 int min_lines; /* guaranteed buffer size */
85 int delta; /* lines to put back */
88 lines = SC_HISTORY_SIZE; /* use the default value */
90 /* make it at least as large as the screen size */
91 lines = imax(lines, scp->ysize);
93 /* remove the history buffer while we update it */
94 history = prev_history = scp->history;
97 /* calculate the amount of lines to put back to extra_history_size */
100 cur_lines = sc_vtb_rows(history);
101 min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
102 if (cur_lines > min_lines)
103 delta = cur_lines - min_lines;
106 /* lines upto min_lines are always allowed. */
107 min_lines = imax(SC_HISTORY_SIZE, scp->ysize);
108 if (lines > min_lines) {
109 if (lines - min_lines > extra_history_size + delta) {
110 /* too many lines are requested */
111 scp->history = prev_history;
116 /* allocate a new buffer */
117 history = kmalloc(sizeof(*history), M_SYSCONS,
118 (wait) ? M_WAITOK : M_NOWAIT);
119 if (history != NULL) {
120 if (lines > min_lines)
121 extra_history_size -= lines - min_lines;
122 /* XXX error check? */
123 sc_vtb_init(history, VTB_RINGBUFFER, scp->xsize, lines,
125 /* FIXME: XXX no good? */
126 sc_vtb_clear(history, scp->sc->scr_map[0x20],
128 if (prev_history != NULL)
129 copy_history(prev_history, history);
130 scp->history_pos = sc_vtb_tail(history);
132 scp->history_pos = 0;
135 /* destroy the previous buffer */
136 if (prev_history != NULL) {
137 extra_history_size += delta;
138 sc_vtb_destroy(prev_history);
139 kfree(prev_history, M_SYSCONS);
142 scp->history = history;
148 copy_history(sc_vtb_t *from, sc_vtb_t *to)
157 lines = sc_vtb_rows(from);
158 cols1 = sc_vtb_cols(from);
159 cols2 = sc_vtb_cols(to);
160 cols = imin(cols1, cols2);
161 pos = sc_vtb_tail(from);
162 for (i = 0; i < lines; ++i) {
163 sc_vtb_append(from, pos, to, cols);
165 sc_vtb_seek(to, sc_vtb_pos(to,
168 pos = sc_vtb_pos(from, pos, cols1);
173 sc_free_history_buffer(scr_stat *scp, int prev_ysize)
176 int cur_lines; /* current buffer size */
177 int min_lines; /* guaranteed buffer size */
179 history = scp->history;
184 cur_lines = sc_vtb_rows(history);
185 min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
186 extra_history_size += (cur_lines > min_lines) ?
187 cur_lines - min_lines : 0;
189 sc_vtb_destroy(history);
190 kfree(history, M_SYSCONS);
193 /* copy entire screen into the top of the history buffer */
195 sc_hist_save(scr_stat *scp)
197 sc_vtb_append(&scp->vtb, 0, scp->history, scp->xsize*scp->ysize);
198 scp->history_pos = sc_vtb_tail(scp->history);
201 /* restore the screen by copying from the history buffer */
203 sc_hist_restore(scr_stat *scp)
207 if (scp->history_pos != sc_vtb_tail(scp->history)) {
208 scp->history_pos = sc_vtb_tail(scp->history);
209 history_to_screen(scp);
214 sc_vtb_seek(scp->history, sc_vtb_pos(scp->history,
215 sc_vtb_tail(scp->history),
216 -scp->xsize*scp->ysize));
220 /* copy screen-full of saved lines */
222 history_to_screen(scr_stat *scp)
224 history_to_screen_lines(scp, scp->ysize);
227 /* copy cnt of saved lines */
229 history_to_screen_lines(scr_stat *scp, int cnt)
233 int lines = imin(cnt, scp->ysize);
235 pos = scp->history_pos;
236 for (i = 1; i <= lines; ++i) {
237 pos = sc_vtb_pos(scp->history, pos, -scp->xsize);
238 sc_vtb_copy(scp->history, pos,
239 &scp->vtb, scp->xsize*(lines - i),
245 /* go to the tail of the history buffer */
247 sc_hist_home(scr_stat *scp)
249 scp->history_pos = sc_vtb_tail(scp->history);
250 history_to_screen(scp);
253 /* Restore old_ysize lines from the tail of the history buffer */
255 sc_hist_getback(scr_stat *scp, int old_ysize)
257 scp->history_pos = sc_vtb_tail(scp->history);
258 history_to_screen_lines(scp, old_ysize);
261 /* go to the top of the history buffer */
263 sc_hist_end(scr_stat *scp)
265 scp->history_pos = sc_vtb_pos(scp->history, sc_vtb_tail(scp->history),
266 scp->xsize*scp->ysize);
267 history_to_screen(scp);
270 /* move one line up */
272 sc_hist_up_line(scr_stat *scp)
274 if (sc_vtb_pos(scp->history, scp->history_pos, -(scp->xsize*scp->ysize))
275 == sc_vtb_tail(scp->history))
277 scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
279 history_to_screen(scp);
283 /* move one line down */
285 sc_hist_down_line(scr_stat *scp)
287 if (scp->history_pos == sc_vtb_tail(scp->history))
289 scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
291 history_to_screen(scp);
296 sc_hist_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag)
303 case CONS_HISTORY: /* set history size */
304 scp = SC_STAT(tp->t_dev);
305 if (*(int *)data <= 0)
307 if (scp->status & BUFFER_SAVED)
309 DPRINTF(5, ("lines:%d, ysize:%d, pool:%d\n",
310 *(int *)data, scp->ysize, extra_history_size));
311 error = sc_alloc_history_buffer(scp,
312 imax(*(int *)data, scp->ysize),
314 DPRINTF(5, ("error:%d, rows:%d, pool:%d\n", error,
315 sc_vtb_rows(scp->history), extra_history_size));
319 scp = SC_STAT(tp->t_dev);
320 sc_vtb_clear(scp->history, scp->sc->scr_map[0x20],
328 #endif /* SC_NO_HISTORY */