1 /* -*- linux-c -*- ------------------------------------------------------- *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
6 * This file is part of the Linux kernel, and is made available under
7 * the terms of the GNU General Public License version 2.
9 * ----------------------------------------------------------------------- */
12 * Common all-VGA modes
18 static struct mode_info vga_modes
[] = {
19 { VIDEO_80x25
, 80, 25, 0 },
20 { VIDEO_8POINT
, 80, 50, 0 },
21 { VIDEO_80x43
, 80, 43, 0 },
22 { VIDEO_80x28
, 80, 28, 0 },
23 { VIDEO_80x30
, 80, 30, 0 },
24 { VIDEO_80x34
, 80, 34, 0 },
25 { VIDEO_80x60
, 80, 60, 0 },
28 static struct mode_info ega_modes
[] = {
29 { VIDEO_80x25
, 80, 25, 0 },
30 { VIDEO_8POINT
, 80, 43, 0 },
33 static struct mode_info cga_modes
[] = {
34 { VIDEO_80x25
, 80, 25, 0 },
37 __videocard video_vga
;
39 /* Set basic 80x25 mode */
40 static u8
vga_set_basic_mode(void)
46 #ifdef CONFIG_VIDEO_400_HACK
47 if (adapter
>= ADAPTER_VGA
) {
49 : : "a" (0x1202), "b" (0x0030)
50 : "ecx", "edx", "esi", "edi");
57 : : "ebx", "ecx", "edx", "esi", "edi");
62 rows
= rdfs8(0x484); /* rows minus one */
64 #ifndef CONFIG_VIDEO_400_HACK
65 if ((ax
== 0x5003 || ax
== 0x5007) &&
66 (rows
== 0 || rows
== 24))
70 if (mode
!= 3 && mode
!= 7)
77 : : "ebx", "ecx", "edx", "esi", "edi");
82 static void vga_set_8font(void)
84 /* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */
87 asm volatile(INT10
: : "a" (0x1112), "b" (0));
89 /* Use alternate print screen */
90 asm volatile(INT10
: : "a" (0x1200), "b" (0x20));
92 /* Turn off cursor emulation */
93 asm volatile(INT10
: : "a" (0x1201), "b" (0x34));
95 /* Cursor is scan lines 6-7 */
96 asm volatile(INT10
: : "a" (0x0100), "c" (0x0607));
99 static void vga_set_14font(void)
101 /* Set 9x14 font - 80x28 on VGA */
104 asm volatile(INT10
: : "a" (0x1111), "b" (0));
106 /* Turn off cursor emulation */
107 asm volatile(INT10
: : "a" (0x1201), "b" (0x34));
109 /* Cursor is scan lines 11-12 */
110 asm volatile(INT10
: : "a" (0x0100), "c" (0x0b0c));
113 static void vga_set_80x43(void)
115 /* Set 80x43 mode on VGA (not EGA) */
118 asm volatile(INT10
: : "a" (0x1201), "b" (0x30));
120 /* Reset video mode */
121 asm volatile(INT10
: : "a" (0x0003));
126 /* I/O address of the VGA CRTC */
129 return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4;
132 static void vga_set_480_scanlines(int end
)
139 out_idx(0x0c, crtc
, 0x11); /* Vertical sync end, unlock CR0-7 */
140 out_idx(0x0b, crtc
, 0x06); /* Vertical total */
141 out_idx(0x3e, crtc
, 0x07); /* Vertical overflow */
142 out_idx(0xea, crtc
, 0x10); /* Vertical sync start */
143 out_idx(end
, crtc
, 0x12); /* Vertical display end */
144 out_idx(0xe7, crtc
, 0x15); /* Vertical blank start */
145 out_idx(0x04, crtc
, 0x16); /* Vertical blank end */
152 static void vga_set_80x30(void)
154 vga_set_480_scanlines(0xdf);
157 static void vga_set_80x34(void)
160 vga_set_480_scanlines(0xdb);
163 static void vga_set_80x60(void)
166 vga_set_480_scanlines(0xdf);
169 static int vga_set_mode(struct mode_info
*mode
)
171 /* Set the basic mode */
172 vga_set_basic_mode();
174 /* Override a possibly broken BIOS */
178 switch (mode
->mode
) {
205 * Note: this probe includes basic information required by all
206 * systems. It should be executed first, by making sure
207 * video-vga.c is listed first in the Makefile.
209 static int vga_probe(void)
213 static const char *card_name
[] = {
214 "CGA/MDA/HGC", "EGA", "VGA"
216 static struct mode_info
*mode_lists
[] = {
221 static int mode_count
[] = {
222 sizeof(cga_modes
)/sizeof(struct mode_info
),
223 sizeof(ega_modes
)/sizeof(struct mode_info
),
224 sizeof(vga_modes
)/sizeof(struct mode_info
),
230 : "a" (0x1200), "b" (0x10) /* Check EGA/VGA */
231 : "ecx", "edx", "esi", "edi");
234 boot_params
.screen_info
.orig_video_ega_bx
= ega_bx
;
237 /* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */
238 if ((u8
)ega_bx
!= 0x10) {
243 : "ebx", "ecx", "edx", "esi", "edi");
245 if (vga_flag
== 0x1a) {
246 adapter
= ADAPTER_VGA
;
248 boot_params
.screen_info
.orig_video_isVGA
= 1;
251 adapter
= ADAPTER_EGA
;
254 adapter
= ADAPTER_CGA
;
257 video_vga
.modes
= mode_lists
[adapter
];
258 video_vga
.card_name
= card_name
[adapter
];
259 return mode_count
[adapter
];
262 __videocard video_vga
=
266 .set_mode
= vga_set_mode
,