1 /* Copyright (C) 1993, 1994 Aladdin Enterprises. All rights reserved.
2
3 This software is provided AS-IS with no warranty, either express or
4 implied.
5
6 This software is distributed under license and may not be copied,
7 modified or distributed except as expressly authorized under the terms
8 of the license contained in the file LICENSE in this distribution.
9
10 For more information about licensing, please refer to
11 http://www.ghostscript.com/licensing/. For information on
12 commercial licensing, go to http://www.artifex.com/licensing/ or
13 contact Artifex Software, Inc., 101 Lucas Valley Road #110,
14 San Rafael, CA 94903, U.S.A., +1(415)492-9861.
15 */
16
17 /* $Id: gdevevga.c,v 1.4 2002/02/21 22:24:51 giles Exp $ */
18 /* IBM PC EGA and VGA display drivers */
19 /* All of the real code is in gdevpcfb.c. */
20 #include "memory_.h"
21 #include "gx.h"
22 #include "gserrors.h"
23 #include "gxdevice.h"
24 #include "gdevpcfb.h"
25
26 /* ------ Internal routines ------ */
27
28 /* We can't catch signals.... */
29 void
pcfb_set_signals(gx_device * dev)30 pcfb_set_signals(gx_device * dev)
31 {
32 }
33
34 /* Read the device state */
35 void
pcfb_get_state(pcfb_bios_state * pbs)36 pcfb_get_state(pcfb_bios_state * pbs)
37 {
38 registers regs;
39
40 regs.h.ah = 0xf;
41 int86(0x10, ®s, ®s);
42 pbs->display_mode = regs.h.al;
43 pbs->text_page = regs.h.bh;
44 regs.h.ah = 0x3;
45 int86(0x10, ®s, ®s);
46 pbs->text_cursor_mode = regs.rshort.cx;
47 regs.rshort.ax = 0x1130;
48 regs.h.bh = 0;
49 int86(0x10, ®s, ®s);
50 switch (regs.rshort.cx) {
51 case 0x08:
52 pbs->text_font = 0x1112;
53 break; /* 8 x 8 */
54 case 0x10:
55 pbs->text_font = 0x1114;
56 break; /* 8 x 16 */
57 default:
58 pbs->text_font = 0x1111; /* 8 x 14 */
59 }
60 regs.h.ah = 0x8;
61 regs.h.bh = pbs->text_page;
62 int86(0x10, ®s, ®s);
63 pbs->text_attribute = regs.h.ah;
64 pbs->border_color = (regs.h.ah >> 4);
65 regs.rshort.ax = 0x1a00;
66 int86(0x10, ®s, ®s);
67 if (regs.h.al == 0x1a && regs.h.bl == 0x8) {
68 regs.rshort.ax = 0x1008;
69 int86(0x10, ®s, ®s);
70 pbs->border_color = regs.h.bh;
71 }
72 if (pbs->display_mode != 3) {
73 pbs->display_mode = 3;
74 pbs->text_font = 0x1112;
75 pbs->text_cursor_mode = 0x0607;
76 pbs->text_attribute = 7;
77 pbs->text_page = 0;
78 }
79 }
80
81 /* Set the device mode */
82 void
pcfb_set_mode(int mode)83 pcfb_set_mode(int mode)
84 {
85 registers regs;
86
87 regs.h.ah = 0;
88 regs.h.al = mode;
89 int86(0x10, ®s, ®s);
90 }
91
92 /* Restore the device state */
93 void
pcfb_set_state(const pcfb_bios_state * pbs)94 pcfb_set_state(const pcfb_bios_state * pbs)
95 {
96 registers regs;
97
98 pcfb_set_mode(pbs->display_mode);
99 regs.rshort.ax = 0x500; /* force display of page 0 */
100 int86(0x10, ®s, ®s);
101 regs.rshort.ax = pbs->text_font;
102 regs.h.bl = 0;
103 int86(0x10, ®s, ®s);
104 regs.h.ah = 0x3;
105 regs.h.bh = 0;
106 int86(0x10, ®s, ®s); /* Get cursor to reset MCGA */
107 regs.h.al = pbs->text_page;
108 regs.h.ah = 0x5;
109 int86(0x10, ®s, ®s);
110 regs.rshort.cx = pbs->text_cursor_mode;
111 regs.h.ah = 0x1;
112 int86(0x10, ®s, ®s);
113 regs.rshort.ax = 0x1001;
114 regs.h.bh = pbs->border_color;
115 int86(0x10, ®s, ®s);
116 }
117