1/*-
2 * Copyright (c) 1995-1998 S��ren Schmidt
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer,
10 *    without modification, immediately at the beginning of the file.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: releng/10.3/sys/dev/syscons/snake/snake_saver.c 230132 2012-01-15 13:23:18Z uqs $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/module.h>
34#include <sys/malloc.h>
35#include <sys/kernel.h>
36#include <sys/sysctl.h>
37#include <sys/consio.h>
38#include <sys/fbio.h>
39#include <sys/resourcevar.h>
40#include <sys/smp.h>
41
42#include <machine/pc/display.h>
43
44#include <dev/fb/fbreg.h>
45#include <dev/fb/splashreg.h>
46#include <dev/syscons/syscons.h>
47
48static u_char	*message;
49static int	*messagep;
50static int	messagelen;
51static int	blanked;
52
53#define MSGBUF_LEN 	70
54
55static int	nofancy = 0;
56TUNABLE_INT("hw.syscons.saver_snake_nofancy", &nofancy);
57
58#define FANCY_SNAKE 	(!nofancy)
59#define LOAD_HIGH(ld) 	(((ld * 100 + FSCALE / 2) >> FSHIFT) / 100)
60#define LOAD_LOW(ld) 	(((ld * 100 + FSCALE / 2) >> FSHIFT) % 100)
61
62static inline void update_msg(void);
63
64static int
65snake_saver(video_adapter_t *adp, int blank)
66{
67	static int	dirx, diry;
68	int		f, color, load;
69	sc_softc_t	*sc;
70	scr_stat	*scp;
71
72/* XXX hack for minimal changes. */
73#define	save	message
74#define	savs	messagep
75
76	sc = sc_find_softc(adp, NULL);
77	if (sc == NULL)
78		return EAGAIN;
79	scp = sc->cur_scp;
80
81	if (blank) {
82		if (adp->va_info.vi_flags & V_INFO_GRAPHICS)
83			return EAGAIN;
84		if (blanked <= 0) {
85			sc_vtb_clear(&scp->scr, sc->scr_map[0x20],
86				     (FG_LIGHTGREY | BG_BLACK) << 8);
87			vidd_set_hw_cursor(adp, -1, -1);
88			sc_set_border(scp, 0);
89			dirx = (scp->xpos ? 1 : -1);
90			diry = (scp->ypos ?
91				scp->xsize : -scp->xsize);
92			for (f=0; f< messagelen; f++)
93				savs[f] = scp->xpos + scp->ypos*scp->xsize;
94			sc_vtb_putc(&scp->scr, savs[0], sc->scr_map[*save],
95				    (FG_LIGHTGREY | BG_BLACK) << 8);
96			blanked = 1;
97		}
98		if (blanked++ < 4)
99			return 0;
100		blanked = 1;
101		sc_vtb_putc(&scp->scr, savs[messagelen - 1], sc->scr_map[0x20],
102			    (FG_LIGHTGREY | BG_BLACK) << 8);
103		for (f=messagelen-1; f > 0; f--)
104			savs[f] = savs[f-1];
105		f = savs[0];
106		if ((f % scp->xsize) == 0 ||
107		    (f % scp->xsize) == scp->xsize - 1 ||
108		    (random() % 50) == 0)
109			dirx = -dirx;
110		if ((f / scp->xsize) == 0 ||
111		    (f / scp->xsize) == scp->ysize - 1 ||
112		    (random() % 20) == 0)
113			diry = -diry;
114		savs[0] += dirx + diry;
115		if (FANCY_SNAKE) {
116			update_msg();
117			load = ((averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT);
118			if (load == 0)
119				color = FG_LIGHTGREY | BG_BLACK;
120			else if (load / mp_ncpus <= 50)
121				color = FG_LIGHTGREEN | BG_BLACK;
122			else if (load / mp_ncpus <= 75)
123				color = FG_YELLOW | BG_BLACK;
124			else if (load / mp_ncpus <= 99)
125				color = FG_LIGHTRED | BG_BLACK;
126			else
127				color = FG_RED | FG_BLINK | BG_BLACK;
128		} else
129			color = FG_LIGHTGREY | BG_BLACK;
130
131		for (f=messagelen-1; f>=0; f--)
132			sc_vtb_putc(&scp->scr, savs[f], sc->scr_map[save[f]],
133				    color << 8);
134	} else
135		blanked = 0;
136
137	return 0;
138}
139
140static inline void
141update_msg(void)
142{
143	if (!FANCY_SNAKE) {
144		messagelen = sprintf(message, "%s %s", ostype, osrelease);
145		return;
146	}
147	messagelen = snprintf(message, MSGBUF_LEN,
148	    "%s %s (%d.%02d %d.%02d, %d.%02d)",
149	    ostype, osrelease,
150	    LOAD_HIGH(averunnable.ldavg[0]), LOAD_LOW(averunnable.ldavg[0]),
151	    LOAD_HIGH(averunnable.ldavg[1]), LOAD_LOW(averunnable.ldavg[1]),
152	    LOAD_HIGH(averunnable.ldavg[2]), LOAD_LOW(averunnable.ldavg[2]));
153}
154
155static int
156snake_init(video_adapter_t *adp)
157{
158	message = malloc(MSGBUF_LEN, M_DEVBUF, M_WAITOK);
159	messagep = malloc(MSGBUF_LEN * sizeof *messagep, M_DEVBUF, M_WAITOK);
160	update_msg();
161	return 0;
162}
163
164static int
165snake_term(video_adapter_t *adp)
166{
167	free(message, M_DEVBUF);
168	free(messagep, M_DEVBUF);
169	return 0;
170}
171
172static scrn_saver_t snake_module = {
173	"snake_saver", snake_init, snake_term, snake_saver, NULL,
174};
175
176SAVER_MODULE(snake_saver, snake_module);
177