Changeset cefb126 in mainline for kernel/arch/ia32/src/boot/vesa_real.inc
- Timestamp:
- 2010-07-02T14:19:30Z (15 years ago)
- Branches:
- lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
- Children:
- 89c57b6
- Parents:
- fe7abd0 (diff), e3ee9b9 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the(diff)links above to see all the changes relative to each parent. - File:
-
- 1 edited
-
kernel/arch/ia32/src/boot/vesa_real.inc (modified) (19 diffs)
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kernel/arch/ia32/src/boot/vesa_real.inc
rfe7abd0 rcefb126 31 31 vesa_init: 32 32 jmp $gdtselector(VESA_INIT_DES), $vesa_init_real - vesa_init 33 33 34 34 .code16 35 35 vesa_init_real: … … 55 55 pushl %eax 56 56 57 # parse default mode string57 /* Parse default mode string */ 58 58 59 59 mov $default_mode - vesa_init, %di … … 65 65 mov (%di), %al 66 66 67 # check for digit67 /* Check for digit */ 68 68 69 69 cmp $'0', %al … … 75 75 sub $'0', %al 76 76 77 # multiply default_width by 10 and add digit77 /* Multiply default_width by 10 and add digit */ 78 78 79 79 mov default_width - vesa_init, %bx … … 96 96 mov (%di), %al 97 97 98 # check for digit98 /* Check for digit */ 99 99 100 100 cmp $'0', %al … … 106 106 sub $'0', %al 107 107 108 # multiply default_height by 10 and add digit108 /* Multiply default_height by 10 and add digit */ 109 109 110 110 mov default_height - vesa_init, %bx … … 127 127 mov (%di), %al 128 128 129 # check for digit129 /* Check for digit */ 130 130 131 131 cmp $'0', %al … … 137 137 sub $'0', %al 138 138 139 # multiply default_bpp by 10 and add digit139 /* Multiply default_bpp by 10 and add digit */ 140 140 141 141 mov default_bpp - vesa_init, %bx … … 167 167 168 168 next_mode: 169 # try next mode 169 /* Try next mode */ 170 170 171 mov %gs:(%si), %cx 171 172 cmp $VESA_END_OF_MODES, %cx … … 186 187 jne no_mode 187 188 188 # check for proper attributes (supported, color, graphics, linear framebuffer) 189 /* 190 * Check for proper attributes (supported, 191 * color, graphics, linear framebuffer). 192 */ 189 193 190 194 mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax … … 193 197 jne next_mode 194 198 195 # check for proper resolution199 /* Check for proper resolution */ 196 200 197 201 mov default_width - vesa_init, %ax … … 203 207 jne next_mode 204 208 205 # check for proper bpp209 /* Check for proper bpp */ 206 210 207 211 mov default_bpp - vesa_init, %al … … 213 217 jne next_mode 214 218 215 # for 24 bpp modes accept also 32 bit bpp219 /* For 24 bpp modes accept also 32 bit bpp */ 216 220 217 221 mov $32, %al … … 230 234 jnz no_mode 231 235 232 # set 3:2:3 VGA palette236 /* Set 3:2:3 VGA palette */ 233 237 234 238 mov VESA_MODE_BPP_OFFSET(%di), %al … … 241 245 mov $0x100, %ecx 242 246 243 bt $5, %ax # test if VGA compatible registers are present 247 /* Test if VGA compatible registers are present */ 248 bt $5, %ax 244 249 jnc vga_compat 245 250 246 # try VESA routine to set palette 251 /* Use VESA routine to set the palette */ 252 247 253 mov $VESA_SET_PALETTE, %ax 248 254 xor %bl, %bl … … 254 260 255 261 vga_compat: 256 # try VGA registers to set palette 257 movw $0x3c6, %dx # set palette mask 262 263 /* Use VGA registers to set the palette */ 264 265 movw $0x3c6, %dx /* set palette mask */ 258 266 movb $0xff, %al 259 267 outb %al, %dx 260 268 261 movw $0x3c8, %dx # first index to set269 movw $0x3c8, %dx /* first index to set */ 262 270 xor %al, %al 263 271 outb %al, %dx 264 272 265 movw $0x3c9, %dx # data port273 movw $0x3c9, %dx /* data port */ 266 274 267 275 vga_loop: … … 284 292 vga_not_set: 285 293 286 # store mode parameters 287 # eax = bpp[8] scanline[16] 288 # ebx = width[16] height[16] 289 # edx = red_mask[8] red_pos[8] green_mask[8] green_pos[8] 290 # esi = blue_mask[8] blue_pos[8] 291 # edi = linear frame buffer 294 /* 295 * Store mode parameters: 296 * eax = bpp[8] scanline[16] 297 * ebx = width[16] height[16] 298 * edx = red_mask[8] red_pos[8] green_mask[8] green_pos[8] 299 * esi = blue_mask[8] blue_pos[8] 300 * edi = linear frame buffer 301 */ 292 302 293 303 mov VESA_MODE_BPP_OFFSET(%di), %al … … 328 338 329 339 no_mode: 330 # no prefered mode found 340 341 /* No prefered mode found */ 342 331 343 mov $0x111, %cx 332 344 push %di … … 339 351 cmp $VESA_OK, %al 340 352 jnz text_mode 341 jz set_mode # force relative jump353 jz set_mode /* force relative jump */ 342 354 343 355 text_mode: 344 # reset to EGA text mode (because of problems with VESA) 356 357 /* Reset to EGA text mode (because of problems with VESA) */ 358 345 359 mov $0x0003, %ax 346 360 int $0x10 347 361 mov $0xffffffff, %edi 348 362 xor %ax, %ax 349 jz vesa_leave_real # force relative jump363 jz vesa_leave_real /* force relative jump */ 350 364 351 365 vga323:
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