1 /* $NetBSD: video.c,v 1.7 2005/12/11 12:17:04 christos Exp $ */ 2 3 /*- 4 * Copyright (C) 1995-1997 Gary Thomas (gdt (at) linuxppc.org) 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 * 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Gary Thomas. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef CONS_BE 34 #include <lib/libsa/stand.h> 35 #include "boot.h" 36 #include "iso_font.h" 37 38 #define FONT_WIDTH 8 39 #define FONT_HEIGHT 16 40 #define VRAM_WIDTH 640 41 #define VRAM_HEIGHT 480 42 #define VRAM_SIZE (VRAM_WIDTH * VRAM_HEIGHT) 43 #define ROW (VRAM_WIDTH / FONT_WIDTH) 44 #define COL (VRAM_HEIGHT / FONT_HEIGHT) 45 46 u_char *VramBase; 47 u_char save_cursor[FONT_WIDTH]; 48 49 /* 50 * The current state of virtual displays 51 */ 52 struct screen { 53 enum state { 54 NORMAL, /* no pending escape */ 55 ESC, /* saw ESC */ 56 EBRAC, /* saw ESC[ */ 57 EBRACEQ /* saw ESC[= */ 58 } state; /* command parser state */ 59 int cx; /* the first escape seq argument */ 60 int cy; /* the second escap seq argument */ 61 int *accp; /* pointer to the current processed argument */ 62 int row; 63 int col; 64 u_char fgcolor; 65 u_char bgcolor; 66 } screen; 67 68 69 void 70 video_init(u_char *buffer) 71 { 72 struct screen *d = &screen; 73 74 VramBase = buffer; 75 d->fgcolor = 0x1f; /* WHITE */ 76 d->bgcolor = 0x00; /* BLACK */ 77 d->row = 0; 78 d->col = 0; 79 d->state = NORMAL; 80 memset(VramBase, d->bgcolor, VRAM_SIZE); 81 memset(save_cursor, d->bgcolor, FONT_WIDTH); 82 } 83 84 static void 85 wrtchar(u_char c, struct screen *d) 86 { 87 u_char *p = VramBase + 88 (d->col * VRAM_WIDTH * FONT_HEIGHT) + (d->row * FONT_WIDTH); 89 int fontbase = c * 16; 90 int x, y; 91 92 for (y = 0; y < FONT_HEIGHT; y++) { 93 for (x = 0; x < FONT_WIDTH; x++) { 94 if ((font[fontbase + y] >> (FONT_WIDTH - x)) & 1) 95 *(p + x + (y * VRAM_WIDTH)) = d->fgcolor; 96 else 97 *(p + x + (y * VRAM_WIDTH)) = d->bgcolor; 98 } 99 } 100 d->row++; 101 } 102 103 static void 104 cursor(struct screen *d, int flag) 105 { 106 int x; 107 int y = FONT_HEIGHT - 1; 108 109 u_char *p = VramBase + 110 (d->col * VRAM_WIDTH * FONT_HEIGHT) + (d->row * FONT_WIDTH); 111 for (x = 0; x < FONT_WIDTH - 1; x++) { 112 if (flag) { 113 save_cursor[x] = *(p + x + (y * VRAM_WIDTH)); 114 *(p + x + (y * VRAM_WIDTH)) = d->fgcolor; 115 } else { 116 *(p + x + (y * VRAM_WIDTH)) = save_cursor[x]; 117 } 118 } 119 } 120 121 /* 122 * vga_putc (nee sput) has support for emulation of the 'ibmpc' termcap entry. 123 * This is a bare-bones implementation of a bare-bones entry 124 * One modification: Change li#24 to li#25 to reflect 25 lines 125 * "ca" is the color/attributes value (left-shifted by 8) 126 * or 0 if the current regular color for that screen is to be used. 127 */ 128 void 129 video_putc(int c) 130 { 131 struct screen *d = &screen; 132 133 cursor(d, 0); 134 135 switch (d->state) { 136 case NORMAL: 137 switch (c) { 138 case 0x0: /* Ignore pad characters */ 139 return; 140 141 case 0x1B: 142 d->state = ESC; 143 break; 144 145 case '\t': 146 do { 147 wrtchar(' ', d); 148 } while (d->row % 8); 149 break; 150 151 case '\b': /* non-destructive backspace */ 152 d->row--; 153 if (d->row < 0) { 154 if (d->col > 0) { 155 d->col--; 156 d->row += ROW; /* prev column */ 157 } else { 158 d->row = 0; 159 } 160 } 161 break; 162 163 case '\n': 164 d->col++; 165 /* FALLTHROUGH */ 166 case '\r': 167 d->row = 0; 168 break; 169 170 case '\007': 171 break; 172 173 default: 174 wrtchar(c, d); 175 if (d->row >= ROW) { 176 d->row = 0; 177 d->col++; 178 } 179 break; 180 } 181 break; 182 183 case ESC: 184 case EBRAC: 185 case EBRACEQ: 186 break; 187 } 188 if (d->col >= COL) { /* scroll check */ 189 memcpy(VramBase, VramBase + VRAM_WIDTH * FONT_HEIGHT, 190 VRAM_SIZE - VRAM_WIDTH * FONT_WIDTH); 191 memset(VramBase + VRAM_SIZE - VRAM_WIDTH * FONT_HEIGHT, 192 d->bgcolor, VRAM_WIDTH * FONT_HEIGHT); 193 d->col = COL - 1; 194 } 195 cursor(d, 1); 196 } 197 #endif 198
Indexes created Sat Sep 20 22:09:52 GMT 2025