H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 1 | /* -*- linux-c -*- ------------------------------------------------------- * |
| 2 | * |
| 3 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 4 | * Copyright 2007 rPath, Inc. - All Rights Reserved |
| 5 | * |
| 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. |
| 8 | * |
| 9 | * ----------------------------------------------------------------------- */ |
| 10 | |
| 11 | /* |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 12 | * Common all-VGA modes |
| 13 | */ |
| 14 | |
| 15 | #include "boot.h" |
| 16 | #include "video.h" |
| 17 | |
| 18 | static struct mode_info vga_modes[] = { |
H. Peter Anvin | 1cac500 | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 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 }, |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 26 | }; |
| 27 | |
| 28 | static struct mode_info ega_modes[] = { |
H. Peter Anvin | 1cac500 | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 29 | { VIDEO_80x25, 80, 25, 0 }, |
| 30 | { VIDEO_8POINT, 80, 43, 0 }, |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 31 | }; |
| 32 | |
| 33 | static struct mode_info cga_modes[] = { |
H. Peter Anvin | 1cac500 | 2008-01-30 13:33:02 +0100 | [diff] [blame] | 34 | { VIDEO_80x25, 80, 25, 0 }, |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 35 | }; |
| 36 | |
| 37 | __videocard video_vga; |
| 38 | |
| 39 | /* Set basic 80x25 mode */ |
| 40 | static u8 vga_set_basic_mode(void) |
| 41 | { |
| 42 | u16 ax; |
| 43 | u8 rows; |
| 44 | u8 mode; |
| 45 | |
| 46 | #ifdef CONFIG_VIDEO_400_HACK |
| 47 | if (adapter >= ADAPTER_VGA) { |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 48 | asm volatile(INT10 |
| 49 | : : "a" (0x1202), "b" (0x0030) |
| 50 | : "ecx", "edx", "esi", "edi"); |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 51 | } |
| 52 | #endif |
| 53 | |
| 54 | ax = 0x0f00; |
H. Peter Anvin | b015124 | 2007-08-22 16:28:01 -0700 | [diff] [blame] | 55 | asm volatile(INT10 |
| 56 | : "+a" (ax) |
| 57 | : : "ebx", "ecx", "edx", "esi", "edi"); |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 58 | |
| 59 | mode = (u8)ax; |
| 60 | |
| 61 | set_fs(0); |
| 62 | rows = rdfs8(0x484); /* rows minus one */ |
| 63 | |
| 64 | #ifndef CONFIG_VIDEO_400_HACK |
| 65 | if ((ax == 0x5003 || ax == 0x5007) && |
| 66 | (rows == 0 || rows == 24)) |
| 67 | return mode; |
| 68 | #endif |
| 69 | |
| 70 | if (mode != 3 && mode != 7) |
| 71 | mode = 3; |
| 72 | |
| 73 | /* Set the mode */ |
H. Peter Anvin | 71351b9 | 2007-08-23 09:28:42 -0700 | [diff] [blame] | 74 | ax = mode; |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 75 | asm volatile(INT10 |
H. Peter Anvin | 71351b9 | 2007-08-23 09:28:42 -0700 | [diff] [blame] | 76 | : "+a" (ax) |
| 77 | : : "ebx", "ecx", "edx", "esi", "edi"); |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 78 | do_restore = 1; |
| 79 | return mode; |
| 80 | } |
| 81 | |
| 82 | static void vga_set_8font(void) |
| 83 | { |
| 84 | /* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */ |
| 85 | |
| 86 | /* Set 8x8 font */ |
| 87 | asm volatile(INT10 : : "a" (0x1112), "b" (0)); |
| 88 | |
| 89 | /* Use alternate print screen */ |
| 90 | asm volatile(INT10 : : "a" (0x1200), "b" (0x20)); |
| 91 | |
| 92 | /* Turn off cursor emulation */ |
| 93 | asm volatile(INT10 : : "a" (0x1201), "b" (0x34)); |
| 94 | |
| 95 | /* Cursor is scan lines 6-7 */ |
| 96 | asm volatile(INT10 : : "a" (0x0100), "c" (0x0607)); |
| 97 | } |
| 98 | |
| 99 | static void vga_set_14font(void) |
| 100 | { |
| 101 | /* Set 9x14 font - 80x28 on VGA */ |
| 102 | |
| 103 | /* Set 9x14 font */ |
| 104 | asm volatile(INT10 : : "a" (0x1111), "b" (0)); |
| 105 | |
| 106 | /* Turn off cursor emulation */ |
| 107 | asm volatile(INT10 : : "a" (0x1201), "b" (0x34)); |
| 108 | |
| 109 | /* Cursor is scan lines 11-12 */ |
| 110 | asm volatile(INT10 : : "a" (0x0100), "c" (0x0b0c)); |
| 111 | } |
| 112 | |
| 113 | static void vga_set_80x43(void) |
| 114 | { |
| 115 | /* Set 80x43 mode on VGA (not EGA) */ |
| 116 | |
| 117 | /* Set 350 scans */ |
| 118 | asm volatile(INT10 : : "a" (0x1201), "b" (0x30)); |
| 119 | |
| 120 | /* Reset video mode */ |
| 121 | asm volatile(INT10 : : "a" (0x0003)); |
| 122 | |
| 123 | vga_set_8font(); |
| 124 | } |
| 125 | |
| 126 | /* I/O address of the VGA CRTC */ |
| 127 | u16 vga_crtc(void) |
| 128 | { |
| 129 | return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4; |
| 130 | } |
| 131 | |
| 132 | static void vga_set_480_scanlines(int end) |
| 133 | { |
| 134 | u16 crtc; |
| 135 | u8 csel; |
| 136 | |
| 137 | crtc = vga_crtc(); |
| 138 | |
| 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 */ |
| 146 | csel = inb(0x3cc); |
| 147 | csel &= 0x0d; |
| 148 | csel |= 0xe2; |
| 149 | outb(csel, 0x3cc); |
| 150 | } |
| 151 | |
| 152 | static void vga_set_80x30(void) |
| 153 | { |
| 154 | vga_set_480_scanlines(0xdf); |
| 155 | } |
| 156 | |
| 157 | static void vga_set_80x34(void) |
| 158 | { |
| 159 | vga_set_14font(); |
| 160 | vga_set_480_scanlines(0xdb); |
| 161 | } |
| 162 | |
| 163 | static void vga_set_80x60(void) |
| 164 | { |
| 165 | vga_set_8font(); |
| 166 | vga_set_480_scanlines(0xdf); |
| 167 | } |
| 168 | |
| 169 | static int vga_set_mode(struct mode_info *mode) |
| 170 | { |
| 171 | /* Set the basic mode */ |
| 172 | vga_set_basic_mode(); |
| 173 | |
| 174 | /* Override a possibly broken BIOS */ |
| 175 | force_x = mode->x; |
| 176 | force_y = mode->y; |
| 177 | |
| 178 | switch (mode->mode) { |
| 179 | case VIDEO_80x25: |
| 180 | break; |
| 181 | case VIDEO_8POINT: |
| 182 | vga_set_8font(); |
| 183 | break; |
| 184 | case VIDEO_80x43: |
| 185 | vga_set_80x43(); |
| 186 | break; |
| 187 | case VIDEO_80x28: |
| 188 | vga_set_14font(); |
| 189 | break; |
| 190 | case VIDEO_80x30: |
| 191 | vga_set_80x30(); |
| 192 | break; |
| 193 | case VIDEO_80x34: |
| 194 | vga_set_80x34(); |
| 195 | break; |
| 196 | case VIDEO_80x60: |
| 197 | vga_set_80x60(); |
| 198 | break; |
| 199 | } |
| 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | /* |
| 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. |
| 208 | */ |
| 209 | static int vga_probe(void) |
| 210 | { |
Pavel Machek | e44b7b7 | 2008-04-10 23:28:10 +0200 | [diff] [blame] | 211 | u16 ega_bx; |
| 212 | |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 213 | static const char *card_name[] = { |
| 214 | "CGA/MDA/HGC", "EGA", "VGA" |
| 215 | }; |
| 216 | static struct mode_info *mode_lists[] = { |
| 217 | cga_modes, |
| 218 | ega_modes, |
| 219 | vga_modes, |
| 220 | }; |
| 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), |
| 225 | }; |
| 226 | u8 vga_flag; |
| 227 | |
| 228 | asm(INT10 |
Pavel Machek | e44b7b7 | 2008-04-10 23:28:10 +0200 | [diff] [blame] | 229 | : "=b" (ega_bx) |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 230 | : "a" (0x1200), "b" (0x10) /* Check EGA/VGA */ |
| 231 | : "ecx", "edx", "esi", "edi"); |
| 232 | |
Pavel Machek | e44b7b7 | 2008-04-10 23:28:10 +0200 | [diff] [blame] | 233 | #ifndef _WAKEUP |
| 234 | boot_params.screen_info.orig_video_ega_bx = ega_bx; |
| 235 | #endif |
| 236 | |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 237 | /* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */ |
Pavel Machek | e44b7b7 | 2008-04-10 23:28:10 +0200 | [diff] [blame] | 238 | if ((u8)ega_bx != 0x10) { |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 239 | /* EGA/VGA */ |
| 240 | asm(INT10 |
| 241 | : "=a" (vga_flag) |
| 242 | : "a" (0x1a00) |
| 243 | : "ebx", "ecx", "edx", "esi", "edi"); |
| 244 | |
| 245 | if (vga_flag == 0x1a) { |
| 246 | adapter = ADAPTER_VGA; |
Pavel Machek | e44b7b7 | 2008-04-10 23:28:10 +0200 | [diff] [blame] | 247 | #ifndef _WAKEUP |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 248 | boot_params.screen_info.orig_video_isVGA = 1; |
Pavel Machek | e44b7b7 | 2008-04-10 23:28:10 +0200 | [diff] [blame] | 249 | #endif |
H. Peter Anvin | 5e8ddcbe | 2007-07-11 12:18:52 -0700 | [diff] [blame] | 250 | } else { |
| 251 | adapter = ADAPTER_EGA; |
| 252 | } |
| 253 | } else { |
| 254 | adapter = ADAPTER_CGA; |
| 255 | } |
| 256 | |
| 257 | video_vga.modes = mode_lists[adapter]; |
| 258 | video_vga.card_name = card_name[adapter]; |
| 259 | return mode_count[adapter]; |
| 260 | } |
| 261 | |
| 262 | __videocard video_vga = |
| 263 | { |
| 264 | .card_name = "VGA", |
| 265 | .probe = vga_probe, |
| 266 | .set_mode = vga_set_mode, |
| 267 | }; |