Annotation of sys/dev/ic/vga_subr.c, Revision 1.1.1.1
1.1 nbrk 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: }
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