Changeset 873c681 in mainline for kernel/arch/ia32/src
- Timestamp:
- 2010-07-01T16:29:48Z (15 years ago)
- Branches:
- lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
- Children:
- 90ed058
- Parents:
- 99718a2e
- Location:
- kernel/arch/ia32/src/boot
- Files:
-
- 4 edited
-
boot.S (modified) (15 diffs)
-
vesa_prot.inc (modified) (7 diffs)
-
vesa_real.inc (modified) (19 diffs)
-
vesa_ret.inc (modified) (1 diff)
Legend:
- Unmodified
- Added
- Removed
-
kernel/arch/ia32/src/boot/boot.S
r99718a2e r873c681 1 # 2 # Copyright (c) 2001-2004Jakub Jermar3 # Copyright (c) 2005-2006Martin Decky4 #All rights reserved.5 # 6 #Redistribution and use in source and binary forms, with or without7 #modification, are permitted provided that the following conditions8 #are met:9 # 10 #- Redistributions of source code must retain the above copyright11 #notice, this list of conditions and the following disclaimer.12 #- Redistributions in binary form must reproduce the above copyright13 #notice, this list of conditions and the following disclaimer in the14 #documentation and/or other materials provided with the distribution.15 #- The name of the author may not be used to endorse or promote products16 #derived from this software without specific prior written permission.17 # 18 #THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR19 #IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES20 #OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.21 #IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,22 #INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT23 #NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,24 #DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY25 #THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT26 #(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF27 #THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.28 # 1 /* 2 * Copyright (c) 2001 Jakub Jermar 3 * Copyright (c) 2005 Martin Decky 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * - Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * - Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * - The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 29 30 30 #include <arch/boot/boot.h> … … 34 34 #include <arch/cpuid.h> 35 35 36 #define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)36 #define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE) 37 37 38 38 .section K_TEXT_START, "ax" 39 39 40 40 .code32 41 42 .macro pm_error msg 43 movl \msg, %esi 44 jmp pm_error_halt 45 .endm 46 47 .macro pm_status msg 48 #ifdef CONFIG_EGA 49 pushl %esi 50 movl \msg, %esi 51 call pm_early_puts 52 popl %esi 53 #endif 54 .endm 55 56 .macro pm2_status msg 57 pushl \msg 58 call early_puts 59 .endm 60 41 61 .align 4 42 62 .global multiboot_image_start … … 44 64 .long MULTIBOOT_HEADER_MAGIC 45 65 .long MULTIBOOT_HEADER_FLAGS 46 .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum66 .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) /* checksum */ 47 67 .long multiboot_header 48 68 .long unmapped_ktext_start … … 53 73 multiboot_image_start: 54 74 cld 55 movl $START_STACK, %esp # initialize stack pointer 56 lgdt KA2PA(bootstrap_gdtr) # initialize Global Descriptor Table register 57 75 76 /* Initialize stack pointer */ 77 movl $START_STACK, %esp 78 79 /* Initialize Global Descriptor Table register */ 80 lgdtl KA2PA(bootstrap_gdtr) 81 82 /* Kernel data + stack */ 58 83 movw $gdtselector(KDATA_DES), %cx 59 84 movw %cx, %es 60 85 movw %cx, %fs 61 86 movw %cx, %gs 62 movw %cx, %ds # kernel data + stack87 movw %cx, %ds 63 88 movw %cx, %ss 64 89 … … 66 91 multiboot_meeting_point: 67 92 68 movl %eax, grub_eax # save parameters from GRUB 93 /* Save GRUB arguments */ 94 movl %eax, grub_eax 69 95 movl %ebx, grub_ebx 96 97 pm_status $status_prot 70 98 71 99 movl $(INTEL_CPUID_LEVEL), %eax 72 100 cpuid 73 cmp $0x0, %eax # any function > 0?101 cmp $0x0, %eax /* any function > 0? */ 74 102 jbe pse_unsupported 75 103 … … 80 108 81 109 pse_unsupported: 82 movl $pse_msg, %esi83 jmp error_halt110 111 pm_error $err_pse 84 112 85 113 pse_supported: 86 114 87 115 #include "vesa_prot.inc" 88 89 # map kernel and turn paging on116 117 /* Map kernel and turn paging on */ 90 118 call map_kernel 91 119 92 # call arch_pre_main(grub_eax, grub_ebx) 120 /* Create the first stack frame */ 121 pushl $0 122 movl %esp, %ebp 123 124 pm2_status $status_prot2 125 126 /* Call arch_pre_main(grub_eax, grub_ebx) */ 93 127 pushl grub_ebx 94 128 pushl grub_eax 95 129 call arch_pre_main 96 97 # Create the first stack frame 98 pushl $0 99 movl %esp, %ebp 100 130 131 pm2_status $status_main 132 133 /* Call main_bsp() */ 101 134 call main_bsp 102 135 103 # not reached136 /* Not reached */ 104 137 cli 105 138 hlt0: … … 107 140 jmp hlt0 108 141 142 /** Setup mapping for the kernel. 143 * 144 * Setup mapping for both the unmapped and mapped sections 145 * of the kernel. For simplicity, we map the entire 4G space. 146 * 147 */ 109 148 .global map_kernel 110 149 map_kernel: 111 #112 # Here we setup mapping for both the unmapped and mapped sections of the kernel.113 # For simplicity, we map the entire 4G space.114 #115 150 movl %cr4, %ecx 116 orl $(1 << 4), %ecx # turn PSE on117 andl $(~(1 << 5)), %ecx # turn PAE off151 orl $(1 << 4), %ecx /* PSE on */ 152 andl $(~(1 << 5)), %ecx /* PAE off */ 118 153 movl %ecx, %cr4 119 154 … … 126 161 movl $((1 << 7) | (1 << 1) | (1 << 0)), %eax 127 162 orl %ebx, %eax 128 movl %eax, (%esi, %ecx, 4) # mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M 129 movl %eax, (%edi, %ecx, 4) # mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M 163 /* Mapping 0x00000000 + %ecx * 4M => 0x00000000 + %ecx * 4M */ 164 movl %eax, (%esi, %ecx, 4) 165 /* Mapping 0x80000000 + %ecx * 4M => 0x00000000 + %ecx * 4M */ 166 movl %eax, (%edi, %ecx, 4) 130 167 addl $(4 * 1024 * 1024), %ebx 131 168 … … 137 174 138 175 movl %cr0, %ebx 139 orl $(1 << 31), %ebx # turn paging on176 orl $(1 << 31), %ebx /* paging on */ 140 177 movl %ebx, %cr0 141 178 ret 142 179 143 # Print string from %esi to EGA display (in red) and halt 144 error_halt: 145 movl $0xb8000, %edi # base of EGA text mode memory 180 /** Print string to EGA display (in light red) and halt. 181 * 182 * Should be executed from 32 bit protected mode with paging 183 * turned off. Stack is not required. This routine is used even 184 * if CONFIG_EGA is not enabled. Since we are going to halt the 185 * CPU anyway, it is always better to at least try to print 186 * some hints. 187 * 188 * @param %esi NULL-terminated string to print. 189 * 190 */ 191 pm_error_halt: 192 movl $0xb8000, %edi /* base of EGA text mode memory */ 146 193 xorl %eax, %eax 147 194 148 movw $0x3d4, %dx # read bits 8 - 15 of the cursor address 195 /* Read bits 8 - 15 of the cursor address */ 196 movw $0x3d4, %dx 149 197 movb $0xe, %al 150 198 outb %al, %dx … … 154 202 shl $8, %ax 155 203 156 movw $0x3d4, %dx # read bits 0 - 7 of the cursor address 204 /* Read bits 0 - 7 of the cursor address */ 205 movw $0x3d4, %dx 157 206 movb $0xf, %al 158 207 outb %al, %dx … … 161 210 inb %dx, %al 162 211 163 cmp $1920, %ax 164 jbe cursor_ok 165 166 movw $1920, %ax # sanity check for the cursor on the last line 167 168 cursor_ok: 212 /* Sanity check for the cursor on screen */ 213 cmp $2000, %ax 214 jb err_cursor_ok 215 216 movw $1998, %ax 217 218 err_cursor_ok: 169 219 170 220 movw %ax, %bx … … 172 222 addl %eax, %edi 173 223 174 movw $0x0c00, %ax # black background, light red foreground 175 176 ploop: 224 err_ploop: 177 225 lodsb 226 178 227 cmp $0, %al 179 je ploop_end 228 je err_ploop_end 229 230 movb $0x0c, %ah /* black background, light red foreground */ 180 231 stosw 232 233 /* Sanity check for the cursor on the last line */ 181 234 inc %bx 182 jmp ploop 183 ploop_end: 184 185 movw $0x3d4, %dx # write bits 8 - 15 of the cursor address 235 cmp $2000, %bx 236 jb err_ploop 237 238 /* Scroll the screen (24 rows) */ 239 movl %esi, %edx 240 movl $0xb80a0, %esi 241 movl $0xb8000, %edi 242 movl $1920, %ecx 243 rep movsw 244 245 /* Clear the 24th row */ 246 xorl %eax, %eax 247 movl $80, %ecx 248 rep stosw 249 250 /* Go to row 24 */ 251 movl %edx, %esi 252 movl $0xb8f00, %edi 253 movw $1920, %bx 254 255 jmp err_ploop 256 err_ploop_end: 257 258 /* Write bits 8 - 15 of the cursor address */ 259 movw $0x3d4, %dx 186 260 movb $0xe, %al 187 261 outb %al, %dx … … 191 265 outb %al, %dx 192 266 193 movw $0x3d4, %dx # write bits 0 - 7 of the cursor address 267 /* Write bits 0 - 7 of the cursor address */ 268 movw $0x3d4, %dx 194 269 movb $0xf, %al 195 270 outb %al, %dx … … 204 279 jmp hlt1 205 280 281 /** Print string to EGA display (in light green). 282 * 283 * Should be called from 32 bit protected mode with paging 284 * turned off. A stack space of at least 24 bytes is required, 285 * but the function does not establish a stack frame. 286 * 287 * Macros such as pm_status take care that this function 288 * is used only when CONFIG_EGA is enabled. 289 * 290 * @param %esi NULL-terminated string to print. 291 * 292 */ 293 pm_early_puts: 294 pushl %eax 295 pushl %ebx 296 pushl %ecx 297 pushl %edx 298 pushl %edi 299 300 movl $0xb8000, %edi /* base of EGA text mode memory */ 301 xorl %eax, %eax 302 303 /* Read bits 8 - 15 of the cursor address */ 304 movw $0x3d4, %dx 305 movb $0xe, %al 306 outb %al, %dx 307 308 movw $0x3d5, %dx 309 inb %dx, %al 310 shl $8, %ax 311 312 /* Read bits 0 - 7 of the cursor address */ 313 movw $0x3d4, %dx 314 movb $0xf, %al 315 outb %al, %dx 316 317 movw $0x3d5, %dx 318 inb %dx, %al 319 320 /* Sanity check for the cursor on screen */ 321 cmp $2000, %ax 322 jb pm_puts_cursor_ok 323 324 movw $1998, %ax 325 326 pm_puts_cursor_ok: 327 328 movw %ax, %bx 329 shl $1, %eax 330 addl %eax, %edi 331 332 pm_puts_ploop: 333 lodsb 334 335 cmp $0, %al 336 je pm_puts_ploop_end 337 338 movb $0x0a, %ah /* black background, light green foreground */ 339 stosw 340 341 /* Sanity check for the cursor on the last line */ 342 inc %bx 343 cmp $2000, %bx 344 jb pm_puts_ploop 345 346 /* Scroll the screen (24 rows) */ 347 movl %esi, %edx 348 movl $0xb80a0, %esi 349 movl $0xb8000, %edi 350 movl $1920, %ecx 351 rep movsw 352 353 /* Clear the 24th row */ 354 xorl %eax, %eax 355 movl $80, %ecx 356 rep stosw 357 358 /* Go to row 24 */ 359 movl %edx, %esi 360 movl $0xb8f00, %edi 361 movw $1920, %bx 362 363 jmp pm_puts_ploop 364 pm_puts_ploop_end: 365 366 /* Write bits 8 - 15 of the cursor address */ 367 movw $0x3d4, %dx 368 movb $0xe, %al 369 outb %al, %dx 370 371 movw $0x3d5, %dx 372 movb %bh, %al 373 outb %al, %dx 374 375 /* Write bits 0 - 7 of the cursor address */ 376 movw $0x3d4, %dx 377 movb $0xf, %al 378 outb %al, %dx 379 380 movw $0x3d5, %dx 381 movb %bl, %al 382 outb %al, %dx 383 384 popl %edi 385 popl %edx 386 popl %ecx 387 popl %ebx 388 popl %eax 389 390 ret 391 392 /** Print string to EGA display. 393 * 394 * Should be called from 32 bit protected mode (with paging 395 * enabled and stack established). This function is ABI compliant. 396 * 397 * If CONFIG_EGA is undefined or CONFIG_FB is defined 398 * then this function does nothing. 399 * 400 * @param %ebp+0x08 NULL-terminated string to print. 401 * 402 */ 403 early_puts: 404 405 #if ((defined(CONFIG_EGA)) && (!defined(CONFIG_FB))) 406 407 /* Prologue, save preserved registers */ 408 pushl %ebp 409 movl %esp, %ebp 410 pushl %ebx 411 pushl %esi 412 pushl %edi 413 414 movl 0x08(%ebp), %esi 415 movl $(PA2KA(0xb8000)), %edi /* base of EGA text mode memory */ 416 xorl %eax, %eax 417 418 /* Read bits 8 - 15 of the cursor address */ 419 movw $0x3d4, %dx 420 movb $0xe, %al 421 outb %al, %dx 422 423 movw $0x3d5, %dx 424 inb %dx, %al 425 shl $8, %ax 426 427 /* Read bits 0 - 7 of the cursor address */ 428 movw $0x3d4, %dx 429 movb $0xf, %al 430 outb %al, %dx 431 432 movw $0x3d5, %dx 433 inb %dx, %al 434 435 /* Sanity check for the cursor on screen */ 436 cmp $2000, %ax 437 jb early_puts_cursor_ok 438 439 movw $1998, %ax 440 441 early_puts_cursor_ok: 442 443 movw %ax, %bx 444 shl $1, %eax 445 addl %eax, %edi 446 447 early_puts_ploop: 448 lodsb 449 450 cmp $0, %al 451 je early_puts_ploop_end 452 453 movb $0x0e, %ah /* black background, yellow foreground */ 454 stosw 455 456 /* Sanity check for the cursor on the last line */ 457 inc %bx 458 cmp $2000, %bx 459 jb early_puts_ploop 460 461 /* Scroll the screen (24 rows) */ 462 movl %esi, %edx 463 movl $(PA2KA(0xb80a0)), %esi 464 movl $(PA2KA(0xb8000)), %edi 465 movl $1920, %ecx 466 rep movsw 467 468 /* Clear the 24th row */ 469 xorl %eax, %eax 470 movl $80, %ecx 471 rep stosw 472 473 /* Go to row 24 */ 474 movl %edx, %esi 475 movl $(PA2KA(0xb8f00)), %edi 476 movw $1920, %bx 477 478 jmp early_puts_ploop 479 early_puts_ploop_end: 480 481 /* Write bits 8 - 15 of the cursor address */ 482 movw $0x3d4, %dx 483 movb $0xe, %al 484 outb %al, %dx 485 486 movw $0x3d5, %dx 487 movb %bh, %al 488 outb %al, %dx 489 490 /* Write bits 0 - 7 of the cursor address */ 491 movw $0x3d4, %dx 492 movb $0xf, %al 493 outb %al, %dx 494 495 movw $0x3d5, %dx 496 movb %bl, %al 497 outb %al, %dx 498 499 /* Epilogue, restore preserved registers */ 500 popl %edi 501 popl %esi 502 popl %ebx 503 leave 504 505 #endif 506 507 ret 508 206 509 #include "vesa_real.inc" 207 510 … … 218 521 .long 0 219 522 220 pse_msg:523 err_pse: 221 524 .asciz "Page Size Extension not supported. System halted." 222 525 526 status_prot: 527 .asciz "[prot] " 528 status_vesa_copy: 529 .asciz "[vesa_copy] " 530 status_grub_cmdline: 531 .asciz "[grub_cmdline] " 532 status_vesa_real: 533 .asciz "[vesa_real] " 534 status_prot2: 535 .asciz "[prot2] " 536 status_main: 537 .asciz "[main] " -
kernel/arch/ia32/src/boot/vesa_prot.inc
r99718a2e r873c681 5 5 #define MBINFO_OFFSET_CMDLINE 16 6 6 7 # copy real mode VESA initialization code 7 /* Copy real mode VESA initialization code */ 8 9 pm_status $status_vesa_copy 8 10 9 11 mov $vesa_init, %esi … … 12 14 rep movsb 13 15 14 # check for GRUB command line 16 /* Check for GRUB command line */ 17 18 pm_status $status_grub_cmdline 15 19 16 20 mov grub_eax, %eax … … 23 27 jnc no_cmdline 24 28 25 # skip the kernel path in command line29 /* Skip the kernel path in command line */ 26 30 27 31 mov MBINFO_OFFSET_CMDLINE(%ebx), %esi … … 52 56 space_loop_done: 53 57 54 # copy at most 23 characters from command line58 /* Copy at most 23 characters from command line */ 55 59 56 60 mov $VESA_INIT_SEGMENT << 4, %edi … … 68 72 cmd_loop_done: 69 73 70 # zero termination74 /* Zero termination */ 71 75 72 76 xor %eax, %eax … … 75 79 no_cmdline: 76 80 77 # jump to the real mode 81 /* Jump to the real mode */ 82 83 pm_status $status_vesa_real 78 84 79 85 mov $VESA_INIT_SEGMENT << 4, %edi … … 81 87 82 88 vesa_meeting_point: 83 # returned back to protected mode89 /* Returned back to protected mode */ 84 90 85 91 mov %ax, KA2PA(vesa_scanline) -
kernel/arch/ia32/src/boot/vesa_real.inc
r99718a2e r873c681 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: -
kernel/arch/ia32/src/boot/vesa_ret.inc
r99718a2e r873c681 1 1 .code32 2 2 vesa_init_protected: 3 cld 4 5 /* Initialize stack pointer */ 6 movl $START_STACK, %esp 7 8 /* Kernel data + stack */ 3 9 movw $gdtselector(KDATA_DES), %cx 4 10 movw %cx, %es 5 11 movw %cx, %fs 6 12 movw %cx, %gs 7 movw %cx, %ds # kernel data + stack13 movw %cx, %ds 8 14 movw %cx, %ss 9 15 10 movl $START_STACK, %esp # initialize stack pointer11 12 16 jmpl $gdtselector(KTEXT_DES), $vesa_meeting_point
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