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snake_saver.c
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Editing: snake_saver.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1995-1998 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 AUTHOR ``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 AUTHOR 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 <sys/param.h> #include <sys/systm.h> #include <sys/module.h> #include <sys/malloc.h> #include <sys/kernel.h> #include <sys/sysctl.h> #include <sys/consio.h> #include <sys/fbio.h> #include <sys/resourcevar.h> #include <sys/smp.h> #include <machine/pc/display.h> #include <dev/fb/fbreg.h> #include <dev/fb/splashreg.h> #include <dev/syscons/syscons.h> static u_char *message; static int *messagep; static int messagelen; static int blanked; #define MSGBUF_LEN 70 static int nofancy = 0; TUNABLE_INT("hw.syscons.saver_snake_nofancy", &nofancy); #define FANCY_SNAKE (!nofancy) #define LOAD_HIGH(ld) (((ld * 100 + FSCALE / 2) >> FSHIFT) / 100) #define LOAD_LOW(ld) (((ld * 100 + FSCALE / 2) >> FSHIFT) % 100) static inline void update_msg(void); static int snake_saver(video_adapter_t *adp, int blank) { static int dirx, diry; int f, color, load; sc_softc_t *sc; scr_stat *scp; /* XXX hack for minimal changes. */ #define save message #define savs messagep sc = sc_find_softc(adp, NULL); if (sc == NULL) return EAGAIN; scp = sc->cur_scp; if (blank) { if (adp->va_info.vi_flags & V_INFO_GRAPHICS) return EAGAIN; if (blanked <= 0) { sc_vtb_clear(&scp->scr, sc->scr_map[0x20], (FG_LIGHTGREY | BG_BLACK) << 8); vidd_set_hw_cursor(adp, -1, -1); sc_set_border(scp, 0); dirx = (scp->xpos ? 1 : -1); diry = (scp->ypos ? scp->xsize : -scp->xsize); for (f=0; f< messagelen; f++) savs[f] = scp->xpos + scp->ypos*scp->xsize; sc_vtb_putc(&scp->scr, savs[0], sc->scr_map[*save], (FG_LIGHTGREY | BG_BLACK) << 8); blanked = 1; } if (blanked++ < 4) return 0; blanked = 1; sc_vtb_putc(&scp->scr, savs[messagelen - 1], sc->scr_map[0x20], (FG_LIGHTGREY | BG_BLACK) << 8); for (f=messagelen-1; f > 0; f--) savs[f] = savs[f-1]; f = savs[0]; if ((f % scp->xsize) == 0 || (f % scp->xsize) == scp->xsize - 1 || (random() % 50) == 0) dirx = -dirx; if ((f / scp->xsize) == 0 || (f / scp->xsize) == scp->ysize - 1 || (random() % 20) == 0) diry = -diry; savs[0] += dirx + diry; if (FANCY_SNAKE) { update_msg(); load = ((averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT); if (load == 0) color = FG_LIGHTGREY | BG_BLACK; else if (load / mp_ncpus <= 50) color = FG_LIGHTGREEN | BG_BLACK; else if (load / mp_ncpus <= 75) color = FG_YELLOW | BG_BLACK; else if (load / mp_ncpus <= 99) color = FG_LIGHTRED | BG_BLACK; else color = FG_RED | FG_BLINK | BG_BLACK; } else color = FG_LIGHTGREY | BG_BLACK; for (f=messagelen-1; f>=0; f--) sc_vtb_putc(&scp->scr, savs[f], sc->scr_map[save[f]], color << 8); } else blanked = 0; return 0; } static inline void update_msg(void) { if (!FANCY_SNAKE) { messagelen = sprintf(message, "%s %s", ostype, osrelease); return; } messagelen = snprintf(message, MSGBUF_LEN, "%s %s (%d.%02d %d.%02d, %d.%02d)", ostype, osrelease, LOAD_HIGH(averunnable.ldavg[0]), LOAD_LOW(averunnable.ldavg[0]), LOAD_HIGH(averunnable.ldavg[1]), LOAD_LOW(averunnable.ldavg[1]), LOAD_HIGH(averunnable.ldavg[2]), LOAD_LOW(averunnable.ldavg[2])); } static int snake_init(video_adapter_t *adp) { message = malloc(MSGBUF_LEN, M_DEVBUF, M_WAITOK); messagep = malloc(MSGBUF_LEN * sizeof *messagep, M_DEVBUF, M_WAITOK); update_msg(); return 0; } static int snake_term(video_adapter_t *adp) { free(message, M_DEVBUF); free(messagep, M_DEVBUF); return 0; } static scrn_saver_t snake_module = { "snake_saver", snake_init, snake_term, snake_saver, NULL, }; SAVER_MODULE(snake_saver, snake_module);
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