1 /* $OpenBSD: vga_subr.c,v 1.3 2004/04/02 04:39:50 deraadt Exp $ */
2 /* $NetBSD: vga_subr.c,v 1.6 2000/01/25 02:44:03 ad Exp $ */
3
4 /*
5 * Copyright (c) 1998
6 * Matthias Drochner. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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 *
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 */
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/device.h>
33 #include <sys/queue.h>
34 #include <machine/bus.h>
35
36 #include <dev/ic/mc6845reg.h>
37 #include <dev/ic/pcdisplayvar.h>
38 #include <dev/ic/vgareg.h>
39 #include <dev/ic/vgavar.h>
40
41 #include <dev/wscons/wsdisplayvar.h>
42
43 static void fontram(struct vga_handle *);
44 static void textram(struct vga_handle *);
45
46 static void
47 fontram(vh)
48 struct vga_handle *vh;
49 {
50 /* program sequencer to access character generator */
51
52 vga_ts_write(vh, syncreset, 0x01); /* synchronous reset */
53 vga_ts_write(vh, wrplmask, 0x04); /* write to map 2 */
54 vga_ts_write(vh, memmode, 0x07); /* sequential addressing */
55 vga_ts_write(vh, syncreset, 0x03); /* clear synchronous reset */
56
57 /* program graphics controller to access character generator */
58
59 vga_gdc_write(vh, rdplanesel, 0x02); /* select map 2 for cpu reads */
60 vga_gdc_write(vh, mode, 0x00); /* disable odd-even addressing */
61 vga_gdc_write(vh, misc, 0x04); /* map starts at 0xA000 */
62 }
63
64 static void
65 textram(vh)
66 struct vga_handle *vh;
67 {
68 /* program sequencer to access video ram */
69
70 vga_ts_write(vh, syncreset, 0x01); /* synchronous reset */
71 vga_ts_write(vh, wrplmask, 0x03); /* write to map 0 & 1 */
72 vga_ts_write(vh, memmode, 0x03); /* odd-even addressing */
73 vga_ts_write(vh, syncreset, 0x03); /* clear synchronous reset */
74
75 /* program graphics controller for text mode */
76
77 vga_gdc_write(vh, rdplanesel, 0x00); /* select map 0 for cpu reads */
78 vga_gdc_write(vh, mode, 0x10); /* enable odd-even addressing */
79 /* map starts at 0xb800 or 0xb000 (mono) */
80 vga_gdc_write(vh, misc, (vh->vh_mono ? 0x0a : 0x0e));
81 }
82
83 void
84 vga_loadchars(vh, fontset, first, num, lpc, data)
85 struct vga_handle *vh;
86 int fontset, first, num;
87 int lpc;
88 char *data;
89 {
90 int offset, i, j, s;
91
92 /* fontset number swizzle done in vga_setfontset() */
93 offset = (fontset << 13) | (first << 5);
94
95 s = splhigh();
96 fontram(vh);
97
98 for (i = 0; i < num; i++)
99 for (j = 0; j < lpc; j++)
100 bus_space_write_1(vh->vh_memt, vh->vh_allmemh,
101 offset + (i << 5) + j,
102 data[i * lpc + j]);
103
104 textram(vh);
105 splx(s);
106 }
107
108 void
109 vga_setfontset(vh, fontset1, fontset2)
110 struct vga_handle *vh;
111 int fontset1, fontset2;
112 {
113 u_int8_t cmap;
114 static u_int8_t cmaptaba[] = {
115 0x00, 0x10, 0x01, 0x11,
116 0x02, 0x12, 0x03, 0x13
117 };
118 static u_int8_t cmaptabb[] = {
119 0x00, 0x20, 0x04, 0x24,
120 0x08, 0x28, 0x0c, 0x2c
121 };
122
123 /* extended font if fontset1 != fontset2 */
124 cmap = cmaptaba[fontset1] | cmaptabb[fontset2];
125
126 vga_ts_write(vh, fontsel, cmap);
127 }
128
129 void
130 vga_setscreentype(vh, type)
131 struct vga_handle *vh;
132 const struct wsscreen_descr *type;
133 {
134 vga_6845_write(vh, maxrow, type->fontheight - 1);
135
136 /* lo byte */
137 vga_6845_write(vh, vde, type->fontheight * type->nrows - 1);
138
139 #ifndef PCDISPLAY_SOFTCURSOR
140 /* set cursor to last 2 lines */
141 vga_6845_write(vh, curstart, type->fontheight - 2);
142 vga_6845_write(vh, curend, type->fontheight - 1);
143 #endif
144 /*
145 * disable colour plane 3 if needed for font selection
146 */
147 if (type->capabilities & WSSCREEN_HILIT) {
148 /*
149 * these are the screens which don't support
150 * 512-character fonts
151 */
152 vga_attr_write(vh, colplen, 0x0f);
153 } else
154 vga_attr_write(vh, colplen, 0x07);
155 }