1 /* $OpenBSD: vga_subr.c,v 1.5 2015/07/18 00:48:05 miod 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
40 #include <dev/wscons/wsdisplayvar.h>
41 #include <dev/ic/vgavar.h>
42
43 static void fontram(struct vga_handle *);
44 static void textram(struct vga_handle *);
45
46 static void
fontram(struct vga_handle * vh)47 fontram(struct vga_handle *vh)
48 {
49 /* program sequencer to access character generator */
50
51 vga_ts_write(vh, syncreset, 0x01); /* synchronous reset */
52 vga_ts_write(vh, wrplmask, 0x04); /* write to map 2 */
53 vga_ts_write(vh, memmode, 0x07); /* sequential addressing */
54 vga_ts_write(vh, syncreset, 0x03); /* clear synchronous reset */
55
56 /* program graphics controller to access character generator */
57
58 vga_gdc_write(vh, rdplanesel, 0x02); /* select map 2 for cpu reads */
59 vga_gdc_write(vh, mode, 0x00); /* disable odd-even addressing */
60 vga_gdc_write(vh, misc, 0x04); /* map starts at 0xA000 */
61 }
62
63 static void
textram(struct vga_handle * vh)64 textram(struct vga_handle *vh)
65 {
66 /* program sequencer to access video ram */
67
68 vga_ts_write(vh, syncreset, 0x01); /* synchronous reset */
69 vga_ts_write(vh, wrplmask, 0x03); /* write to map 0 & 1 */
70 vga_ts_write(vh, memmode, 0x03); /* odd-even addressing */
71 vga_ts_write(vh, syncreset, 0x03); /* clear synchronous reset */
72
73 /* program graphics controller for text mode */
74
75 vga_gdc_write(vh, rdplanesel, 0x00); /* select map 0 for cpu reads */
76 vga_gdc_write(vh, mode, 0x10); /* enable odd-even addressing */
77 /* map starts at 0xb800 or 0xb000 (mono) */
78 vga_gdc_write(vh, misc, (vh->vh_mono ? 0x0a : 0x0e));
79 }
80
81 void
vga_loadchars(struct vga_handle * vh,int fontset,int first,int num,int lpc,char * data)82 vga_loadchars(struct vga_handle *vh, int fontset, int first, int num, int lpc,
83 char *data)
84 {
85 int offset, i, j, s;
86
87 /* fontset number swizzle done in vga_setfontset() */
88 offset = (fontset << 13) | (first << 5);
89
90 s = splhigh();
91 fontram(vh);
92
93 for (i = 0; i < num; i++)
94 for (j = 0; j < lpc; j++)
95 bus_space_write_1(vh->vh_memt, vh->vh_allmemh,
96 offset + (i << 5) + j,
97 data[i * lpc + j]);
98
99 textram(vh);
100 splx(s);
101 }
102
103 void
vga_setfontset(struct vga_handle * vh,int fontset1,int fontset2)104 vga_setfontset(struct vga_handle *vh, int fontset1, int fontset2)
105 {
106 u_int8_t cmap;
107 static const u_int8_t cmaptaba[] = {
108 0x00, 0x10, 0x01, 0x11,
109 0x02, 0x12, 0x03, 0x13
110 };
111 static const u_int8_t cmaptabb[] = {
112 0x00, 0x20, 0x04, 0x24,
113 0x08, 0x28, 0x0c, 0x2c
114 };
115
116 /* extended font if fontset1 != fontset2 */
117 cmap = cmaptaba[fontset1] | cmaptabb[fontset2];
118
119 vga_ts_write(vh, fontsel, cmap);
120 }
121
122 void
vga_setscreentype(struct vga_handle * vh,const struct wsscreen_descr * type)123 vga_setscreentype(struct vga_handle *vh, const struct wsscreen_descr *type)
124 {
125 vga_6845_write(vh, maxrow, type->fontheight - 1);
126
127 /* lo byte */
128 vga_6845_write(vh, vde, type->fontheight * type->nrows - 1);
129
130 #ifndef PCDISPLAY_SOFTCURSOR
131 /* set cursor to last 2 lines */
132 vga_6845_write(vh, curstart, type->fontheight - 2);
133 vga_6845_write(vh, curend, type->fontheight - 1);
134 #endif
135 /*
136 * disable colour plane 3 if needed for font selection
137 */
138 if (type->capabilities & WSSCREEN_HILIT) {
139 /*
140 * these are the screens which don't support
141 * 512-character fonts
142 */
143 vga_attr_write(vh, colplen, 0x0f);
144 } else
145 vga_attr_write(vh, colplen, 0x07);
146 }
147