snake_saver.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1995-1998 S��ren Schmidt
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer,
12 *    without modification, immediately at the beginning of the file.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * $FreeBSD: stable/11/sys/dev/syscons/snake/snake_saver.c 330897 2018-03-14 03:19:51Z eadler $
31 */
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/module.h>
36#include <sys/malloc.h>
37#include <sys/kernel.h>
38#include <sys/sysctl.h>
39#include <sys/consio.h>
40#include <sys/fbio.h>
41#include <sys/resourcevar.h>
42#include <sys/smp.h>
43
44#include <machine/pc/display.h>
45
46#include <dev/fb/fbreg.h>
47#include <dev/fb/splashreg.h>
48#include <dev/syscons/syscons.h>
49
50static u_char	*message;
51static int	*messagep;
52static int	messagelen;
53static int	blanked;
54
55#define MSGBUF_LEN 	70
56
57static int	nofancy = 0;
58TUNABLE_INT("hw.syscons.saver_snake_nofancy", &nofancy);
59
60#define FANCY_SNAKE 	(!nofancy)
61#define LOAD_HIGH(ld) 	(((ld * 100 + FSCALE / 2) >> FSHIFT) / 100)
62#define LOAD_LOW(ld) 	(((ld * 100 + FSCALE / 2) >> FSHIFT) % 100)
63
64static inline void update_msg(void);
65
66static int
67snake_saver(video_adapter_t *adp, int blank)
68{
69	static int	dirx, diry;
70	int		f, color, load;
71	sc_softc_t	*sc;
72	scr_stat	*scp;
73
74/* XXX hack for minimal changes. */
75#define	save	message
76#define	savs	messagep
77
78	sc = sc_find_softc(adp, NULL);
79	if (sc == NULL)
80		return EAGAIN;
81	scp = sc->cur_scp;
82
83	if (blank) {
84		if (adp->va_info.vi_flags & V_INFO_GRAPHICS)
85			return EAGAIN;
86		if (blanked <= 0) {
87			sc_vtb_clear(&scp->scr, sc->scr_map[0x20],
88				     (FG_LIGHTGREY | BG_BLACK) << 8);
89			vidd_set_hw_cursor(adp, -1, -1);
90			sc_set_border(scp, 0);
91			dirx = (scp->xpos ? 1 : -1);
92			diry = (scp->ypos ?
93				scp->xsize : -scp->xsize);
94			for (f=0; f< messagelen; f++)
95				savs[f] = scp->xpos + scp->ypos*scp->xsize;
96			sc_vtb_putc(&scp->scr, savs[0], sc->scr_map[*save],
97				    (FG_LIGHTGREY | BG_BLACK) << 8);
98			blanked = 1;
99		}
100		if (blanked++ < 4)
101			return 0;
102		blanked = 1;
103		sc_vtb_putc(&scp->scr, savs[messagelen - 1], sc->scr_map[0x20],
104			    (FG_LIGHTGREY | BG_BLACK) << 8);
105		for (f=messagelen-1; f > 0; f--)
106			savs[f] = savs[f-1];
107		f = savs[0];
108		if ((f % scp->xsize) == 0 ||
109		    (f % scp->xsize) == scp->xsize - 1 ||
110		    (random() % 50) == 0)
111			dirx = -dirx;
112		if ((f / scp->xsize) == 0 ||
113		    (f / scp->xsize) == scp->ysize - 1 ||
114		    (random() % 20) == 0)
115			diry = -diry;
116		savs[0] += dirx + diry;
117		if (FANCY_SNAKE) {
118			update_msg();
119			load = ((averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT);
120			if (load == 0)
121				color = FG_LIGHTGREY | BG_BLACK;
122			else if (load / mp_ncpus <= 50)
123				color = FG_LIGHTGREEN | BG_BLACK;
124			else if (load / mp_ncpus <= 75)
125				color = FG_YELLOW | BG_BLACK;
126			else if (load / mp_ncpus <= 99)
127				color = FG_LIGHTRED | BG_BLACK;
128			else
129				color = FG_RED | FG_BLINK | BG_BLACK;
130		} else
131			color = FG_LIGHTGREY | BG_BLACK;
132
133		for (f=messagelen-1; f>=0; f--)
134			sc_vtb_putc(&scp->scr, savs[f], sc->scr_map[save[f]],
135				    color << 8);
136	} else
137		blanked = 0;
138
139	return 0;
140}
141
142static inline void
143update_msg(void)
144{
145	if (!FANCY_SNAKE) {
146		messagelen = sprintf(message, "%s %s", ostype, osrelease);
147		return;
148	}
149	messagelen = snprintf(message, MSGBUF_LEN,
150	    "%s %s (%d.%02d %d.%02d, %d.%02d)",
151	    ostype, osrelease,
152	    LOAD_HIGH(averunnable.ldavg[0]), LOAD_LOW(averunnable.ldavg[0]),
153	    LOAD_HIGH(averunnable.ldavg[1]), LOAD_LOW(averunnable.ldavg[1]),
154	    LOAD_HIGH(averunnable.ldavg[2]), LOAD_LOW(averunnable.ldavg[2]));
155}
156
157static int
158snake_init(video_adapter_t *adp)
159{
160	message = malloc(MSGBUF_LEN, M_DEVBUF, M_WAITOK);
161	messagep = malloc(MSGBUF_LEN * sizeof *messagep, M_DEVBUF, M_WAITOK);
162	update_msg();
163	return 0;
164}
165
166static int
167snake_term(video_adapter_t *adp)
168{
169	free(message, M_DEVBUF);
170	free(messagep, M_DEVBUF);
171	return 0;
172}
173
174static scrn_saver_t snake_module = {
175	"snake_saver", snake_init, snake_term, snake_saver, NULL,
176};
177
178SAVER_MODULE(snake_saver, snake_module);
179