2 * Copyright (C) 2007-2009 Luc Verhaegen <libv@skynet.be>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; either version 2 of the License, or (at your option)
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include <pc80/vga_io.h>
25 * pci io enable should've happened before
30 vga_enable_mask(0x01, 0x01);
32 /* cr io is at 0x3D4/0x3D5 */
33 vga_misc_mask(0x01, 0x01);
35 /* clear cr0-7 protection */
36 vga_cr_mask(0x11, 0x00, 0x80);
45 vga_sr_write(0x02, 0x03);
46 vga_sr_write(0x03, 0x00);
47 vga_sr_write(0x04, 0x02); /* access all 256kB */
49 vga_gr_write(0x00, 0x00);
50 vga_gr_write(0x01, 0x00);
51 vga_gr_write(0x02, 0x00);
52 vga_gr_write(0x03, 0x00);
53 vga_gr_write(0x04, 0x00);
54 vga_gr_write(0x05, 0x10);
55 vga_gr_write(0x06, 0x0E); /* map at 0xB8000 */
56 vga_gr_write(0x07, 0x00);
57 vga_gr_write(0x08, 0xFF);
59 /* o/e enable: ram enable */
60 vga_misc_mask(0x22, 0x22);
69 memset((void *)VGA_FB, 0x00, 0x8000);
72 #include "vga_palette.c"
78 vga_palette_init(void)
82 /* set up attribute registers */
83 for (i = 0; i < 0x10; i++)
86 vga_ar_write(0x10, 0x0c);
87 vga_ar_write(0x11, 0x00);
88 vga_ar_write(0x12, 0x0F);
89 vga_ar_write(0x13, 0x08);
90 vga_ar_write(0x14, 0x00);
92 vga_palette_disable();
94 /* load actual palette */
95 vga_dac_mask_write(0xFF);
97 for (i = 0; i < 0x100; i++) {
98 vga_dac_write_address(i);
99 vga_dac_data_write(default_vga_palette[i].red);
100 vga_dac_data_write(default_vga_palette[i].green);
101 vga_dac_data_write(default_vga_palette[i].blue);
109 vga_mode_set(int hdisplay, int hblankstart, int hsyncstart, int hsyncend,
110 int hblankend, int htotal, int vdisplay, int vblankstart,
111 int vsyncstart, int vsyncend, int vblankend, int vtotal,
117 vga_cr_write(0x00, htotal);
122 vga_cr_write(0x01, hdisplay);
124 /* hblankstart: 2048 */
127 vga_cr_write(0x02, hblankstart);
129 /* hblankend: hblankstart + 512 */
132 vga_cr_mask(0x03, hblankend, 0x1F);
133 vga_cr_mask(0x05, hblankend << 2, 0x80);
135 /* hsyncstart: 255 * 8: 2040 */
136 vga_cr_write(0x04, hsyncstart / 8);
138 /* hsyncend: hsyncstart + 255 */
139 vga_cr_mask(0x05, hsyncend / 8, 0x1F);
143 vga_cr_write(0x06, vtotal);
144 vga_cr_mask(0x07, vtotal >> 8, 0x01);
145 vga_cr_mask(0x07, vtotal >> 4, 0x20);
149 vga_cr_write(0x12, vdisplay);
150 vga_cr_mask(0x07, vdisplay >> 7, 0x02);
151 vga_cr_mask(0x07, vdisplay >> 3, 0x40);
153 /* vblankstart: 1024 */
155 vga_cr_write(0x15, vblankstart);
156 vga_cr_mask(0x07, vblankstart >> 5, 0x08);
157 vga_cr_mask(0x09, vblankstart >> 4, 0x20);
159 /* vblankend: vblankstart + 256 */
161 vga_cr_write(0x16, vblankend);
163 /* vsyncstart: 1023 */
164 vga_cr_write(0x10, vsyncstart);
165 vga_cr_mask(0x07, vsyncstart >> 6, 0x04);
166 vga_cr_mask(0x07, vsyncstart >> 2, 0x80);
168 /* vsyncend: vsyncstart + 16 */
169 vga_cr_mask(0x11, vsyncend, 0x0F);
172 vga_cr_write(0x13, stride / 8);
175 vga_cr_write(0x18, 0xFF);
176 vga_cr_mask(0x07, 0x10, 0x10);
177 vga_cr_mask(0x09, 0x40, 0x40);
179 vga_misc_mask(0x44, 0xCC); /* set up clock: 27mhz and h/vsync */
181 vga_cr_mask(0x09, 0x00, 0x80); /* disable doublescan */
184 #include "vga_font_8x16.c"
187 vga_font_8x16_load(void)
191 unsigned char sr2, sr4, gr5, gr6;
196 sr2 = vga_sr_read(0x02);
197 sr4 = vga_sr_read(0x04);
198 gr5 = vga_gr_read(0x05);
199 gr6 = vga_gr_read(0x06);
201 /* disable odd/even */
202 vga_sr_mask(0x04, 0x04, 0x04);
203 vga_gr_mask(0x05, 0x00, 0x10);
204 vga_gr_mask(0x06, 0x00, 0x02);
207 vga_sr_write(0x02, 0x04);
208 p = (unsigned char *) VGA_FB;
209 for (i = 0; i < count; i++) {
210 for (j = 0; j < 32; j++) {
212 *p = vga_font_8x16[i][j];
219 vga_gr_write(0x06, gr6);
220 vga_gr_write(0x05, gr5);
221 vga_sr_write(0x04, sr4);
222 vga_sr_write(0x02, sr2);
224 /* set up font size */
225 vga_cr_mask(0x09, 16 - 1, 0x1F);
232 vga_cursor_enable(int enable)
235 vga_cr_mask(0x0A, 0x00, 0x20);
237 vga_cr_mask(0x0A, 0x20, 0x20);
244 vga_cursor_reset(void)
246 vga_cr_write(0x0A, 0x2E);
247 vga_cr_write(0x0B, 0x0E);
248 vga_cr_write(0x0E, 0x00);
249 vga_cr_write(0x0F, 0x00);
256 vga_cursor_set(unsigned int line, unsigned int character)
258 unsigned int offset = (80 * line + character) & 0xFFFF;
260 vga_cr_write(0x0A, 0x0E);
261 vga_cr_write(0x0B, 0x0E);
262 vga_cr_write(0x0E, offset >> 8);
263 vga_cr_write(0x0F, offset & 0xFF);
270 vga_frame_set(unsigned int line, unsigned int character)
272 unsigned int offset = (80 * line + character) & 0xFFFF;
274 vga_cr_write(0x0C, offset >> 8);
275 vga_cr_write(0x0D, offset & 0xFF);
279 * simply fills a line with the given string.
282 vga_line_write(unsigned int line, const char *string)
284 unsigned short *p = (unsigned short *) VGA_FB + (80 * line);
285 int i, len = strlen(string);
287 for (i = 0; i < 80; i++) {
289 p[i] = 0x0F00 | string[i];
296 * set up everything to get a basic 80x25 textmode.
299 vga_textmode_init(void)
301 vga_sr_write(0x00, 0x01); /* clear reset */
302 vga_sr_write(0x01, 0x00);
305 vga_cr_mask(0x03, 0x80, 0xE0);
306 vga_cr_mask(0x05, 0x00, 0x60);
308 vga_cr_write(0x08, 0x00);
310 vga_cr_write(0x14, 0x00); /* */
312 vga_cr_write(0x17, 0x23);
316 vga_mode_set(640, 648, 680, 776, 792, 800,
317 400, 407, 412, 414, 442, 449, 320);
324 vga_font_8x16_load();
326 vga_sr_mask(0x00, 0x02, 0x02); /* take us out of reset */
327 vga_cr_mask(0x17, 0x80, 0x80); /* sync! */