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001 /* Copyright (C) 2004 David Decotigny 001 /* Copyright (C) 2004 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 !! 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 !! 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. !! 016 USA. 017 */ 017 */ 018 #include <sos/klibc.h> 018 #include <sos/klibc.h> 019 #include <hwcore/ioports.h> 019 #include <hwcore/ioports.h> 020 020 021 #include "x86_videomem.h" 021 #include "x86_videomem.h" 022 022 023 /* The text video memory starts at address 0xB 023 /* The text video memory starts at address 0xB8000. Odd bytes are the 024 ASCII value of the character, even bytes ar 024 ASCII value of the character, even bytes are attribute for the 025 preceding character. */ 025 preceding character. */ 026 #define VIDEO 0xb8000 026 #define VIDEO 0xb8000 027 027 028 028 029 /* Console screen size */ 029 /* Console screen size */ 030 #define LINES 25 030 #define LINES 25 031 #define COLUMNS 80 031 #define COLUMNS 80 032 032 033 /* << 034 * VGA ports and commands. << 035 * << 036 * @see Ralf Brown's interrupt (and port) list << 037 * http://www-2.cs.cmu.edu/~ralf/files.html << 038 */ << 039 << 040 /* VGA ports */ << 041 #define VGA_COMMAND_PORT 0x3D4 << 042 #define VGA_DATA_PORT 0x3D5 << 043 << 044 /* VGA commands */ << 045 #define VGA_SET_CURSOR_START 0xA << 046 #define VGA_SET_CURSOR_END 0xB << 047 #define VGA_SET_CURSOR_HIGH 0xE << 048 #define VGA_SET_CURSOR_LOW 0xF << 049 033 050 /** The structure of a character element in th 034 /** The structure of a character element in the video memory. @see 051 http://webster.cs.ucr.edu/AoA DOS edition 035 http://webster.cs.ucr.edu/AoA DOS edition chapter 23 */ 052 typedef struct { 036 typedef struct { 053 unsigned char character; 037 unsigned char character; 054 unsigned char attribute; 038 unsigned char attribute; 055 } __attribute__ ((packed)) x86_video_mem[LINES 039 } __attribute__ ((packed)) x86_video_mem[LINES*COLUMNS]; 056 040 057 041 058 042 059 /** The base pointer for the video memory */ 043 /** The base pointer for the video memory */ 060 static volatile x86_video_mem *video = (volati 044 static volatile x86_video_mem *video = (volatile x86_video_mem*)VIDEO; 061 045 062 sos_ret_t sos_x86_videomem_setup(void) 046 sos_ret_t sos_x86_videomem_setup(void) 063 { 047 { >> 048 /* >> 049 * Hide cursor. @see Ralf Brown's interrupt (and port) list >> 050 * http://www-2.cs.cmu.edu/~ralf/files.html >> 051 */ >> 052 #define CRT_REG_INDEX 0x3d4 >> 053 #define CRT_REG_DATA 0x3d5 >> 054 064 /* CRT index port => ask for access to regis 055 /* CRT index port => ask for access to register 0xa ("cursor 065 start") */ 056 start") */ 066 outb(0x0a, VGA_COMMAND_PORT); !! 057 outb(0x0a, CRT_REG_INDEX); 067 058 068 /* (RBIL Tables 708 & 654) CRT Register 0xa 059 /* (RBIL Tables 708 & 654) CRT Register 0xa => bit 5 = cursor OFF */ 069 outb(1 << 5, VGA_DATA_PORT); !! 060 outb(1 << 5, CRT_REG_DATA); 070 061 071 return SOS_OK; 062 return SOS_OK; 072 } 063 } 073 064 074 065 075 sos_ret_t sos_x86_videomem_cls(unsigned char a 066 sos_ret_t sos_x86_videomem_cls(unsigned char attribute) 076 { 067 { 077 /* Clears the screen */ 068 /* Clears the screen */ 078 int i; 069 int i; 079 for(i = 0 ; i < LINES*COLUMNS ; i++) 070 for(i = 0 ; i < LINES*COLUMNS ; i++) 080 { 071 { 081 (*video)[i].character = 0; 072 (*video)[i].character = 0; 082 (*video)[i].attribute = attribute; 073 (*video)[i].attribute = attribute; 083 } 074 } 084 075 085 return SOS_OK; !! 076 return SOS_OK; 086 } 077 } 087 078 088 079 089 sos_ret_t sos_x86_videomem_putstring(unsigned 080 sos_ret_t sos_x86_videomem_putstring(unsigned char row, unsigned char col, 090 unsigned 081 unsigned char attribute, 091 const cha 082 const char *str) 092 { 083 { 093 unsigned video_offs = row*COLUMNS + col; 084 unsigned video_offs = row*COLUMNS + col; 094 085 095 if (video_offs >= LINES*COLUMNS) 086 if (video_offs >= LINES*COLUMNS) 096 return -SOS_EINVAL; 087 return -SOS_EINVAL; 097 !! 088 098 for ( ; str && *str && (video_offs < LINES*C 089 for ( ; str && *str && (video_offs < LINES*COLUMNS) ; str++, video_offs++) 099 { 090 { 100 (*video)[video_offs].character = (unsign 091 (*video)[video_offs].character = (unsigned char)*str; 101 (*video)[video_offs].attribute = attribu 092 (*video)[video_offs].attribute = attribute; 102 } 093 } 103 094 104 return SOS_OK; 095 return SOS_OK; 105 } 096 } 106 097 107 098 108 sos_ret_t sos_x86_videomem_putchar(unsigned ch 099 sos_ret_t sos_x86_videomem_putchar(unsigned char row, unsigned char col, 109 unsigned ch 100 unsigned char attribute, 110 unsigned ch 101 unsigned char c) 111 { 102 { 112 unsigned video_offs = row*COLUMNS + col; 103 unsigned video_offs = row*COLUMNS + col; 113 104 114 if (video_offs >= LINES*COLUMNS) 105 if (video_offs >= LINES*COLUMNS) 115 return -SOS_EINVAL; 106 return -SOS_EINVAL; 116 !! 107 117 (*video)[video_offs].character = c; 108 (*video)[video_offs].character = c; 118 (*video)[video_offs].attribute = attribute; 109 (*video)[video_offs].attribute = attribute; 119 110 120 return SOS_OK; 111 return SOS_OK; 121 } 112 } 122 113 123 114 124 sos_ret_t sos_x86_videomem_printf(unsigned cha 115 sos_ret_t sos_x86_videomem_printf(unsigned char row, unsigned char col, 125 unsigned cha 116 unsigned char attribute, 126 const char * 117 const char *format, /* args */...) 127 { 118 { 128 char buff[256]; 119 char buff[256]; 129 va_list ap; 120 va_list ap; 130 !! 121 131 va_start(ap, format); 122 va_start(ap, format); 132 vsnprintf(buff, sizeof(buff), format, ap); 123 vsnprintf(buff, sizeof(buff), format, ap); 133 va_end(ap); 124 va_end(ap); 134 !! 125 135 return sos_x86_videomem_putstring(row, col, 126 return sos_x86_videomem_putstring(row, col, attribute, buff); 136 } << 137 << 138 << 139 /* << 140 * Console that supports scrolling, based on t << 141 * above. This console only takes part of the << 142 * CONSOLE_ROW_START. The rows before that one << 143 * kernel debugging messages. << 144 */ << 145 << 146 /* Current row in the high-level console. Must << 147 computations inside sos_screen_putchar() */ << 148 static int row; << 149 << 150 /* Current column in the high-level console. M << 151 of computations inside sos_screen_putchar() << 152 static int col; << 153 << 154 /* The limit between the low-level console, ac << 155 and the high-level console, accessible to t << 156 through the sos_screen_putchar() function. << 157 #define CONSOLE_ROW_START 12 << 158 << 159 static void sos_screen_set_cursor (unsigned in << 160 { << 161 unsigned int pos; << 162 << 163 pos = (row * COLUMNS + col); << 164 << 165 outb(VGA_SET_CURSOR_HIGH, VGA_COMMAND_PORT); << 166 outb( (pos >> 8), VGA_DATA_PORT); << 167 outb(VGA_SET_CURSOR_LOW, VGA_COMMAND_PORT); << 168 outb( (pos & 0xFF), VGA_DATA_PORT); << 169 } << 170 << 171 sos_ret_t sos_screen_putchar (char c) << 172 { << 173 if (c == '\r') << 174 { << 175 /* Go to first row */ << 176 col = 0; << 177 } << 178 << 179 /* New line */ << 180 else if (c == '\n') << 181 { << 182 /* Go to next line */ << 183 col = 0; << 184 row ++; << 185 } << 186 << 187 /* Remove the last character */ << 188 else if (c == '\b') << 189 { << 190 /* Next character should be displayed in << 191 one */ << 192 col --; << 193 << 194 /* Handle the case where we're at the be << 195 if (col < 0) << 196 { << 197 row --; << 198 col = COLUMNS-1; << 199 << 200 if (row < CONSOLE_ROW_START) << 201 { << 202 row = CONSOLE_ROW_START; << 203 col = 0; << 204 } << 205 } << 206 << 207 /* Replace the current character with a << 208 sos_x86_videomem_putchar << 209 (row, col, SOS_X86_VIDEO_FG_BLUE | SOS << 210 } << 211 else if (c != 0) << 212 { << 213 sos_x86_videomem_putchar << 214 (row, col, SOS_X86_VIDEO_FG_BLUE | SOS << 215 col++; << 216 if (col == COLUMNS) << 217 { << 218 col = 0; << 219 row++; << 220 } << 221 } << 222 << 223 /* Need to scroll ? */ << 224 if (row == LINES) << 225 { << 226 int i; << 227 << 228 /* Copy each line in the previous line * << 229 for (i = CONSOLE_ROW_START; i < LINES; i << 230 memcpy ((char*) video + i * COLUMNS * << 231 (char*) video + ((i + 1) * COL << 232 COLUMNS * 2); << 233 << 234 /* Reset the last line of the console */ << 235 for (i = 0; i < COLUMNS; i++) << 236 sos_x86_videomem_putchar << 237 (LINES-1, i, SOS_X86_VIDEO_FG_BLUE | << 238 << 239 row--; << 240 } << 241 << 242 sos_screen_set_cursor (row, col); << 243 << 244 return SOS_OK; << 245 } << 246 << 247 sos_ret_t sos_screen_init (void) << 248 { << 249 int i, j; << 250 << 251 row = CONSOLE_ROW_START; << 252 col = 0; << 253 << 254 /* Set the first scan line for the cursor, a << 255 mode. First scan line is 11, so that we h << 256 cursor. */ << 257 outb(VGA_SET_CURSOR_START, VGA_COMMAND_PORT) << 258 outb(((0x2 << 5) | 14), VGA_DATA_PORT); << 259 << 260 for (i = CONSOLE_ROW_START; i < LINES; i++) << 261 { << 262 for (j = 0; j < COLUMNS; j++) << 263 sos_x86_videomem_putchar << 264 (i, j, SOS_X86_VIDEO_FG_BLUE | SOS_X << 265 } << 266 << 267 sos_screen_set_cursor (row, col); << 268 << 269 return SOS_OK; << 270 } 127 }
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