4 * Copyright (c) 1998 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
7 * This code is derived from software contributed to The DragonFly Project
8 * by Sascha Wildner <saw@online.de>.
10 * Simple font scaling code by Sascha Wildner and Matthew Dillon
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer as
17 * the first lines of this file unmodified.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * $FreeBSD: src/sys/dev/syscons/scvidctl.c,v 1.19.2.2 2000/05/05 09:16:08 nyan Exp $
36 #include "opt_syscons.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
41 #include <sys/signalvar.h>
43 #include <sys/kernel.h>
44 #include <sys/thread2.h>
46 #include <machine/console.h>
47 #include <machine/framebuffer.h>
49 #include <dev/video/fb/fbreg.h>
52 SET_DECLARE(scrndr_set, const sc_renderer_t);
55 sc_set_text_mode(scr_stat *scp, struct tty *tp, int mode, int xsize, int ysize,
64 lwkt_gettoken(&tty_token);
65 if ((*vidsw[scp->sc->adapter]->get_info)(scp->sc->adp, mode, &info)) {
66 lwkt_reltoken(&tty_token);
69 lwkt_reltoken(&tty_token);
71 /* adjust argument values */
73 fontsize = info.vi_cheight;
76 #ifndef SC_NO_FONT_LOADING
77 if (!(scp->sc->fonts_loaded & FONT_8))
79 font = scp->sc->font_8;
83 } else if (fontsize >= 16) {
85 #ifndef SC_NO_FONT_LOADING
86 if (!(scp->sc->fonts_loaded & FONT_16))
88 font = scp->sc->font_16;
94 #ifndef SC_NO_FONT_LOADING
95 if (!(scp->sc->fonts_loaded & FONT_14))
97 font = scp->sc->font_14;
102 if ((xsize <= 0) || (xsize > info.vi_width))
103 xsize = info.vi_width;
104 if ((ysize <= 0) || (ysize > info.vi_height))
105 ysize = info.vi_height;
107 /* stop screen saver, etc */
109 if ((error = sc_clean_up(scp))) {
114 if (scp->sc->fbi != NULL &&
115 sc_render_match(scp, "kms", V_INFO_MM_TEXT) == NULL) {
119 if (scp->sc->fbi == NULL &&
120 sc_render_match(scp, scp->sc->adp->va_name, V_INFO_MM_TEXT) == NULL) {
127 #ifndef SC_NO_HISTORY
128 if (scp->history != NULL) {
130 new_ysize = sc_vtb_rows(scp->history);
133 prev_ysize = scp->ysize;
135 * This is a kludge to fend off scrn_update() while we
136 * muck around with scp. XXX
138 scp->status |= UNKNOWN_MODE | MOUSE_HIDDEN;
139 scp->status &= ~(GRAPHICS_MODE | PIXEL_MODE | MOUSE_VISIBLE);
141 scp->model = V_INFO_MM_TEXT;
146 scp->xpixel = scp->xsize*8;
147 scp->ypixel = scp->ysize*fontsize;
149 scp->font_height = fontsize;
152 /* allocate buffers */
153 sc_alloc_scr_buffer(scp, TRUE, TRUE);
154 sc_init_emulator(scp, NULL);
155 #ifndef SC_NO_CUTPASTE
156 sc_alloc_cut_buffer(scp, FALSE);
158 #ifndef SC_NO_HISTORY
159 sc_alloc_history_buffer(scp, new_ysize, prev_ysize, FALSE);
163 if (scp == scp->sc->cur_scp)
165 scp->status &= ~UNKNOWN_MODE;
169 DPRINTF(5, ("ws_*size (%d,%d), size (%d,%d)\n",
170 tp->t_winsize.ws_col, tp->t_winsize.ws_row, scp->xsize, scp->ysize));
171 if (tp->t_winsize.ws_col != scp->xsize
172 || tp->t_winsize.ws_row != scp->ysize) {
173 tp->t_winsize.ws_col = scp->xsize;
174 tp->t_winsize.ws_row = scp->ysize;
175 pgsignal(tp->t_pgrp, SIGWINCH, 1);
182 sc_set_graphics_mode(scr_stat *scp, struct tty *tp, int mode)
184 #ifdef SC_NO_MODE_CHANGE
190 lwkt_gettoken(&tty_token);
191 if ((*vidsw[scp->sc->adapter]->get_info)(scp->sc->adp, mode, &info)) {
192 lwkt_reltoken(&tty_token);
195 lwkt_reltoken(&tty_token);
197 /* stop screen saver, etc */
199 if ((error = sc_clean_up(scp))) {
204 if (scp->sc->fbi != NULL &&
205 sc_render_match(scp, "kms", V_INFO_MM_OTHER) == NULL) {
209 if (scp->sc->fbi == NULL &&
210 sc_render_match(scp, scp->sc->adp->va_name, V_INFO_MM_OTHER) == NULL) {
216 scp->status |= (UNKNOWN_MODE | GRAPHICS_MODE | MOUSE_HIDDEN);
217 scp->status &= ~(PIXEL_MODE | MOUSE_VISIBLE);
219 scp->model = V_INFO_MM_OTHER;
221 * Don't change xsize and ysize; preserve the previous vty
222 * and history buffers.
226 scp->xpixel = info.vi_width;
227 scp->ypixel = info.vi_height;
229 scp->font_height = 0;
231 #ifndef SC_NO_SYSMOUSE
232 /* move the mouse cursor at the center of the screen */
233 sc_mouse_move(scp, scp->xpixel / 2, scp->ypixel / 2);
235 sc_init_emulator(scp, NULL);
238 if (scp == scp->sc->cur_scp)
240 /* clear_graphics();*/
241 refresh_ega_palette(scp);
242 scp->status &= ~UNKNOWN_MODE;
246 if (tp->t_winsize.ws_xpixel != scp->xpixel
247 || tp->t_winsize.ws_ypixel != scp->ypixel) {
248 tp->t_winsize.ws_xpixel = scp->xpixel;
249 tp->t_winsize.ws_ypixel = scp->ypixel;
250 pgsignal(tp->t_pgrp, SIGWINCH, 1);
254 #endif /* SC_NO_MODE_CHANGE */
258 sc_set_pixel_mode(scr_stat *scp, struct tty *tp, int xsize, int ysize,
261 #ifndef SC_PIXEL_MODE
270 lwkt_gettoken(&tty_token);
271 if ((*vidsw[scp->sc->adapter]->get_info)(scp->sc->adp, scp->mode, &info)) {
272 lwkt_reltoken(&tty_token);
273 return ENODEV; /* this shouldn't happen */
275 lwkt_reltoken(&tty_token);
277 /* adjust argument values */
279 fontsize = info.vi_cheight;
282 #ifndef SC_NO_FONT_LOADING
283 if (!(scp->sc->fonts_loaded & FONT_8))
285 font = scp->sc->font_8;
289 } else if (fontsize >= 16) {
291 #ifndef SC_NO_FONT_LOADING
292 if (!(scp->sc->fonts_loaded & FONT_16))
294 font = scp->sc->font_16;
300 #ifndef SC_NO_FONT_LOADING
301 if (!(scp->sc->fonts_loaded & FONT_14))
303 font = scp->sc->font_14;
309 xsize = info.vi_width/8;
311 ysize = info.vi_height/fontsize;
313 if ((info.vi_width < xsize*8) || (info.vi_height < ysize*fontsize))
317 * We currently support the following graphic modes:
319 * - 4 bpp planar modes whose memory size does not exceed 64K
320 * - 8 bbp packed pixel modes
321 * - 15, 16, 24 and 32 bpp direct modes with linear frame buffer
324 if (info.vi_mem_model == V_INFO_MM_PLANAR) {
325 if (info.vi_planes != 4)
329 * A memory size >64K requires bank switching to access the entire
333 if (info.vi_width * info.vi_height / 8 > info.vi_window_size)
335 } else if (info.vi_mem_model == V_INFO_MM_PACKED) {
336 if (info.vi_depth != 8)
338 } else if (info.vi_mem_model == V_INFO_MM_DIRECT) {
339 if (!(info.vi_flags & V_INFO_LINEAR) &&
340 (info.vi_depth != 15) && (info.vi_depth != 16) &&
341 (info.vi_depth != 24) && (info.vi_depth != 32))
346 /* stop screen saver, etc */
348 if ((error = sc_clean_up(scp))) {
353 if (sc_render_match(scp, scp->sc->adp->va_name, info.vi_mem_model) == NULL) {
360 (*scp->tsw->te_term)(scp, scp->ts);
367 #ifndef SC_NO_HISTORY
368 if (scp->history != NULL) {
370 new_ysize = sc_vtb_rows(scp->history);
373 prev_ysize = scp->ysize;
374 scp->status |= (UNKNOWN_MODE | PIXEL_MODE | MOUSE_HIDDEN);
375 scp->status &= ~(GRAPHICS_MODE | MOUSE_VISIBLE);
376 scp->model = info.vi_mem_model;
379 scp->xoff = (scp->xpixel/8 - xsize)/2;
380 scp->yoff = (scp->ypixel/fontsize - ysize)/2;
382 scp->font_height = fontsize;
385 /* allocate buffers */
386 sc_alloc_scr_buffer(scp, TRUE, TRUE);
387 sc_init_emulator(scp, NULL);
388 #ifndef SC_NO_CUTPASTE
389 sc_alloc_cut_buffer(scp, FALSE);
391 #ifndef SC_NO_HISTORY
392 sc_alloc_history_buffer(scp, new_ysize, prev_ysize, FALSE);
396 if (scp == scp->sc->cur_scp) {
397 sc_set_border(scp, scp->border);
398 sc_set_cursor_image(scp);
401 scp->status &= ~UNKNOWN_MODE;
405 if (tp->t_winsize.ws_col != scp->xsize
406 || tp->t_winsize.ws_row != scp->ysize) {
407 tp->t_winsize.ws_col = scp->xsize;
408 tp->t_winsize.ws_row = scp->ysize;
409 pgsignal(tp->t_pgrp, SIGWINCH, 1);
413 #endif /* SC_PIXEL_MODE */
416 #define fb_ioctl(a, c, d) \
417 (((a) == NULL) ? ENODEV : \
418 (*vidsw[(a)->va_index]->ioctl)((a), (c), (caddr_t)(d)))
421 sc_vid_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag)
424 video_adapter_t *adp;
425 #ifndef SC_NO_MODE_CHANGE
432 scp = SC_STAT(tp->t_dev);
433 if (scp == NULL) /* tp == SC_MOUSE */
436 if (adp == NULL && scp->fbi == NULL) /* shouldn't happen??? */
439 lwkt_gettoken(&tty_token);
442 case CONS_CURRENTADP: /* get current adapter index */
444 if (scp->fbi != NULL) {
447 ret = fb_ioctl(adp, FBIO_ADAPTER, data);
449 lwkt_reltoken(&tty_token);
452 case CONS_CURRENT: /* get current adapter type */
454 if (scp->fbi != NULL) {
457 ret = fb_ioctl(adp, FBIO_ADPTYPE, data);
459 lwkt_reltoken(&tty_token);
462 case CONS_ADPINFO: /* adapter information */
464 if (scp->fbi != NULL) {
465 lwkt_reltoken(&tty_token);
468 if (((video_adapter_info_t *)data)->va_index >= 0) {
469 adp = vid_get_adapter(((video_adapter_info_t *)data)->va_index);
471 lwkt_reltoken(&tty_token);
475 ret = fb_ioctl(adp, FBIO_ADPINFO, data);
476 lwkt_reltoken(&tty_token);
479 case CONS_GET: /* get current video mode */
481 *(int *)data = scp->mode;
482 lwkt_reltoken(&tty_token);
485 #ifndef SC_NO_MODE_CHANGE
487 case FBIO_SETMODE: /* set video mode */
488 if (scp->fbi != NULL) {
489 lwkt_reltoken(&tty_token);
490 if (*(int *)data != 0)
495 if (!(adp->va_flags & V_ADP_MODECHANGE)) {
496 lwkt_reltoken(&tty_token);
499 info.vi_mode = *(int *)data;
500 error = fb_ioctl(adp, FBIO_MODEINFO, &info);
502 lwkt_reltoken(&tty_token);
505 if (info.vi_flags & V_INFO_GRAPHICS) {
506 lwkt_reltoken(&tty_token);
507 return sc_set_graphics_mode(scp, tp, *(int *)data);
509 lwkt_reltoken(&tty_token);
510 return sc_set_text_mode(scp, tp, *(int *)data, 0, 0, 0);
512 #endif /* SC_NO_MODE_CHANGE */
514 case CONS_MODEINFO: /* get mode information */
516 if (scp->fbi != NULL) {
517 /* Fabricate some mode information for KMS framebuffer */
518 video_info_t *vinfo = (video_info_t *)data;
520 vinfo->vi_flags = V_INFO_COLOR;
521 vinfo->vi_width = scp->xsize;
522 vinfo->vi_height = scp->ysize;
523 vinfo->vi_cwidth = scp->font_width;
524 vinfo->vi_cheight = scp->font_height;
525 vinfo->vi_window = 0;
526 vinfo->vi_window_size = 0;
527 vinfo->vi_buffer = 0;
528 vinfo->vi_buffer_size = 0;
529 vinfo->vi_mem_model = V_INFO_MM_TEXT;
532 ret = fb_ioctl(adp, FBIO_MODEINFO, data);
534 lwkt_reltoken(&tty_token);
537 case CONS_FINDMODE: /* find a matching video mode */
539 if (scp->fbi != NULL) {
542 ret = fb_ioctl(adp, FBIO_FINDMODE, data);
544 lwkt_reltoken(&tty_token);
547 case CONS_SETWINORG: /* set frame buffer window origin */
549 if (scp != scp->sc->cur_scp) {
550 lwkt_reltoken(&tty_token);
551 return ENODEV; /* XXX */
553 if (scp->fbi != NULL) {
554 lwkt_reltoken(&tty_token);
557 ret = fb_ioctl(adp, FBIO_SETWINORG, data);
558 lwkt_reltoken(&tty_token);
561 case FBIO_GETWINORG: /* get frame buffer window origin */
562 if (scp != scp->sc->cur_scp) {
563 lwkt_reltoken(&tty_token);
564 return ENODEV; /* XXX */
566 if (scp->fbi != NULL) {
569 ret = fb_ioctl(adp, FBIO_GETWINORG, data);
571 lwkt_reltoken(&tty_token);
574 case FBIO_GETDISPSTART:
575 case FBIO_SETDISPSTART:
576 case FBIO_GETLINEWIDTH:
577 case FBIO_SETLINEWIDTH:
578 if (scp != scp->sc->cur_scp) {
579 lwkt_reltoken(&tty_token);
580 return ENODEV; /* XXX */
582 if (scp->fbi != NULL) {
585 ret = fb_ioctl(adp, cmd, data);
587 lwkt_reltoken(&tty_token);
590 case FBIO_GETPALETTE:
591 case FBIO_SETPALETTE:
603 if (scp != scp->sc->cur_scp) {
604 lwkt_reltoken(&tty_token);
605 return ENODEV; /* XXX */
607 if (scp->fbi != NULL) {
610 ret = fb_ioctl(adp, cmd, data);
612 lwkt_reltoken(&tty_token);
615 case KDSETMODE: /* set current mode of this (virtual) console */
616 switch (*(int *)data) {
617 case KD_TEXT: /* switch to TEXT (known) mode */
619 * If scp->mode is of graphics modes, we don't know which
620 * text mode to switch back to...
622 if (scp->status & GRAPHICS_MODE) {
623 lwkt_reltoken(&tty_token);
626 /* restore fonts & palette ! */
628 #ifndef SC_NO_FONT_LOADING
629 if (scp->fbi == NULL && ISFONTAVAIL(adp->va_flags)
630 && !(scp->status & (GRAPHICS_MODE | PIXEL_MODE))) {
633 * Don't load fonts for now... XXX
635 if (scp->sc->fonts_loaded & FONT_8)
636 sc_load_font(scp, 0, 8, scp->sc->font_8, 0, 256);
637 if (scp->sc->fonts_loaded & FONT_14)
638 sc_load_font(scp, 0, 14, scp->sc->font_14, 0, 256);
639 if (scp->sc->fonts_loaded & FONT_16)
640 sc_load_font(scp, 0, 16, scp->sc->font_16, 0, 256);
642 #endif /* SC_NO_FONT_LOADING */
645 #ifndef SC_NO_PALETTE_LOADING
646 if (scp->fbi == NULL)
647 load_palette(adp, scp->sc->palette);
650 /* move hardware cursor out of the way */
651 if (scp->fbi == NULL)
652 (*vidsw[adp->va_index]->set_hw_cursor)(adp, -1, -1);
655 case KD_TEXT1: /* switch to TEXT (known) mode */
657 * If scp->mode is of graphics modes, we don't know which
658 * text/pixel mode to switch back to...
660 if (scp->status & GRAPHICS_MODE) {
661 lwkt_reltoken(&tty_token);
665 if ((error = sc_clean_up(scp))) {
667 lwkt_reltoken(&tty_token);
670 scp->status |= UNKNOWN_MODE | MOUSE_HIDDEN;
672 /* no restore fonts & palette */
673 if (scp == scp->sc->cur_scp)
675 sc_clear_screen(scp);
676 scp->status &= ~UNKNOWN_MODE;
677 lwkt_reltoken(&tty_token);
681 case KD_PIXEL: /* pixel (raster) display */
682 if (!(scp->status & (GRAPHICS_MODE | PIXEL_MODE))) {
683 lwkt_reltoken(&tty_token);
686 if (scp->fbi != NULL) {
687 lwkt_reltoken(&tty_token);
690 if (scp->status & GRAPHICS_MODE) {
691 lwkt_reltoken(&tty_token);
692 return sc_set_pixel_mode(scp, tp, scp->xsize, scp->ysize,
696 if ((error = sc_clean_up(scp))) {
698 lwkt_reltoken(&tty_token);
701 scp->status |= (UNKNOWN_MODE | PIXEL_MODE | MOUSE_HIDDEN);
703 if (scp == scp->sc->cur_scp) {
705 #ifndef SC_NO_PALETTE_LOADING
706 load_palette(adp, scp->sc->palette);
709 sc_clear_screen(scp);
710 scp->status &= ~UNKNOWN_MODE;
711 lwkt_reltoken(&tty_token);
713 #endif /* SC_PIXEL_MODE */
715 case KD_GRAPHICS: /* switch to GRAPHICS (unknown) mode */
717 if ((error = sc_clean_up(scp))) {
719 lwkt_reltoken(&tty_token);
722 scp->status |= UNKNOWN_MODE | MOUSE_HIDDEN;
724 lwkt_reltoken(&tty_token);
728 lwkt_reltoken(&tty_token);
734 case KDRASTER: /* set pixel (raster) display mode */
735 if (scp->fbi != NULL || ISUNKNOWNSC(scp) || ISTEXTSC(scp)) {
736 lwkt_reltoken(&tty_token);
739 lwkt_reltoken(&tty_token);
740 return sc_set_pixel_mode(scp, tp, ((int *)data)[0], ((int *)data)[1],
742 #endif /* SC_PIXEL_MODE */
744 case KDGETMODE: /* get current mode of this (virtual) console */
746 * From the user program's point of view, KD_PIXEL is the same
749 *data = ISGRAPHSC(scp) ? KD_GRAPHICS : KD_TEXT;
750 lwkt_reltoken(&tty_token);
753 case KDSBORDER: /* set border color of this (virtual) console */
755 if (scp == scp->sc->cur_scp)
756 sc_set_border(scp, scp->border);
757 lwkt_reltoken(&tty_token);
761 lwkt_reltoken(&tty_token);
765 static LIST_HEAD(, sc_renderer) sc_rndr_list =
766 LIST_HEAD_INITIALIZER(sc_rndr_list);
769 sc_render_add(sc_renderer_t *rndr)
771 LIST_INSERT_HEAD(&sc_rndr_list, rndr, link);
776 sc_render_remove(sc_renderer_t *rndr)
779 LIST_REMOVE(rndr, link);
781 return EBUSY; /* XXX */
785 sc_render_match(scr_stat *scp, char *name, int model)
787 const sc_renderer_t **list;
788 const sc_renderer_t *p;
790 if (!LIST_EMPTY(&sc_rndr_list)) {
791 LIST_FOREACH(p, &sc_rndr_list, link) {
792 if ((strcmp(p->name, name) == 0) &&
793 (model == p->model)) {
795 ~(VR_CURSOR_ON | VR_CURSOR_BLINK);
800 SET_FOREACH(list, scrndr_set) {
802 if ((strcmp(p->name, name) == 0) &&
803 (model == p->model)) {
805 ~(VR_CURSOR_ON | VR_CURSOR_BLINK);
814 #define VIRTUAL_TTY(sc, x) ((SC_DEV((sc),(x)) != NULL) ? \
815 (SC_DEV((sc),(x))->si_tty) : NULL)
818 sc_update_render(scr_stat *scp)
823 int prev_ysize, new_ysize;
824 #ifndef SC_NO_HISTORY
825 int old_xpos, old_ypos;
834 if (scp->rndr == NULL)
837 if (scp->fbi == scp->sc->fbi)
841 scp->fbi = scp->sc->fbi;
843 if (strcmp(sw->te_renderer, "*") != 0) {
844 rndr = sc_render_match(scp, sw->te_renderer, scp->model);
846 if (rndr == NULL && scp->sc->fbi != NULL) {
847 rndr = sc_render_match(scp, "kms", scp->model);
849 if (rndr == NULL) { /* this shouldn't happen */
850 rndr = sc_render_match(scp, scp->sc->adp->va_name, scp->model);
858 /* Mostly copied from sc_set_text_mode */
859 if ((error = sc_clean_up(scp))) {
864 #ifndef SC_NO_HISTORY
865 old_xpos = old_ypos = 0;
866 if (scp->history != NULL) {
867 if (scp->xsize > 0) {
868 old_xpos = scp->xpos;
869 old_ypos = scp->ypos;
872 new_ysize = sc_vtb_rows(scp->history);
875 prev_ysize = scp->ysize;
876 scp->status |= UNKNOWN_MODE | MOUSE_HIDDEN;
877 scp->status &= ~(GRAPHICS_MODE | PIXEL_MODE | MOUSE_VISIBLE);
878 scp->model = V_INFO_MM_TEXT;
879 scp->xpixel = scp->fbi->width;
880 scp->ypixel = scp->fbi->height;
883 * Assume square pixels for now
885 kprintf("kms console: xpixels %d ypixels %d\n",
886 scp->xpixel, scp->ypixel);
888 sc_font_scale(scp, 0, 0);
890 kprintf("kms console: scale-to %dx%d cols=%d rows=%d\n",
891 scp->blk_width, scp->blk_height, scp->xsize, scp->ysize);
893 /* allocate buffers */
894 sc_alloc_scr_buffer(scp, TRUE, TRUE);
895 sc_init_emulator(scp, NULL);
896 #ifndef SC_NO_CUTPASTE
897 sc_alloc_cut_buffer(scp, FALSE);
899 #ifndef SC_NO_HISTORY
900 sc_alloc_history_buffer(scp, new_ysize, prev_ysize, FALSE);
901 if (scp->history != NULL) {
902 sc_hist_getback(scp, prev_ysize);
903 sc_move_cursor(scp, old_xpos, old_ypos);
907 scp->status &= ~UNKNOWN_MODE;
908 tp = VIRTUAL_TTY(scp->sc, scp->index);
911 if (tp->t_winsize.ws_col != scp->xsize ||
912 tp->t_winsize.ws_row != scp->ysize) {
913 tp->t_winsize.ws_col = scp->xsize;
914 tp->t_winsize.ws_row = scp->ysize;
915 pgsignal(tp->t_pgrp, SIGWINCH, 1);