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# Copyright (c) 2005 Ondrej Palkovsky
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# Copyright (c) 2005 Ondrej Palkovsky
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# Copyright (c) 2006 Martin Decky
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# Copyright (c) 2006 Martin Decky
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# Copyright (c) 2008 Jakub Jermar
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# All rights reserved.
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# All rights reserved.
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#
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#
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# Redistribution and use in source and binary forms, with or without
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# modification, are permitted provided that the following conditions
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# are met:
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# are met:
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	.long 0
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	.long 0
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	.long multiboot_image_start
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	.long multiboot_image_start
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 55 
 
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multiboot_image_start:
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multiboot_image_start:
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	movl $START_STACK, %esp			# initialize stack pointer
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	movl $START_STACK, %esp			# initialize stack pointer
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	lgdt bootstrap_gdtr				# initialize Global Descriptor Table register
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	lgdtl bootstrap_gdtr			# initialize Global Descriptor Table register
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 59 
 
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	movw $gdtselector(KDATA_DES), %cx
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	movw $gdtselector(KDATA_DES), %cx
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	movw %cx, %es
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	movw %cx, %es
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	movw %cx, %ds							# kernel data + stack
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	movw %cx, %ds							# kernel data + stack
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	movw %cx, %ss
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	movw %cx, %ss
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	outb %al, %dx
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	outb %al, %dx
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	cli
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	cli
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	hlt
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	hlt
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602
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.section K_DATA_START, "aw", @progbits
 604 
.section K_INI_PTLS, "aw", @progbits
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 605 
 
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 606 
#
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 607 
# Macro for generating initial page table contents.
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 608 
# @param cnt	Number of entries to generat. Must be multiple of 8.
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# @param g	Number of GB that will be added to the mapping.
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#
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 611 
.macro ptl2gen cnt g
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 612 
.if \cnt
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 613 
	ptl2gen "\cnt - 8" \g
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 614 
	.quad ((\cnt - 8) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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 615 
	.quad ((\cnt - 7) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad ((\cnt - 6) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad ((\cnt - 5) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad ((\cnt - 4) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad ((\cnt - 3) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad ((\cnt - 2) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad ((\cnt - 1) * 0x200000) + (\g * 1024 * 1024 * 1024) | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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.endif
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 623 
.endm
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 624 
 
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 625 
# Page table for pages in the first gigabyte.
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.align 4096
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.align 4096
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 627 
.global ptl_2_0g
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 628 
ptl_2_0g:
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 629 
	ptl2gen 512 0
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 630 
 
605 
# Identical mapping of first 64MB and the same of -2GB -> 0
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# Page table for pages in the second gigabyte.
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.align 4096
606 
.global ptl_2
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.global ptl_2_1g
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ptl_2:
634 
ptl_2_1g:
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	.quad 0x0 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	ptl2gen 512 1
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	.quad 0x200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0xa00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0xc00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0xe00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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# Page table for pages in the third gigabyte.
616 
	.quad 0x1000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x1200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x1400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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.align 4096
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	.quad 0x1600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x1800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x1a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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.global ptl_2_2g
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	.quad 0x1c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x1e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x2000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x2200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x2400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x2600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x2800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x2a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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ptl_2_2g:
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	.quad 0x2c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	ptl2gen 512 2
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 642 
 
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	.quad 0x2e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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# Page table for pages in the fourth gigabyte.
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	.quad 0x3000000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x3200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x3400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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.align 4096
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	.quad 0x3600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x3800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x3a00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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.global ptl_2_3g
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	.quad 0x3c00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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ptl_2_3g:
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	.quad 0x3e00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	ptl2gen 512 3
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648 
 
641 
.align 4096
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.align 4096
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.global ptl_1
 650 
.global ptl_1
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ptl_1:
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ptl_1:
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 652 
	# Identity mapping for [0; 4G)
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	.quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
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	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
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	.quad ptl_2_1g + (PTL_WRITABLE | PTL_PRESENT)
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	.quad ptl_2_2g + (PTL_WRITABLE | PTL_PRESENT)
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	.quad ptl_2_3g + (PTL_WRITABLE | PTL_PRESENT)
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	.fill 509,8,0
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	.fill 506, 8, 0
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	# Mapping of [0; 1G) at -2G
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	.quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
 659 
	.quad ptl_2_0g + (PTL_WRITABLE | PTL_PRESENT)
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	.fill 1,8,0
 660 
	.fill 1, 8, 0
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661
649 
.align 4096
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.align 4096
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.global ptl_0
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.global ptl_0
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ptl_0:
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ptl_0:
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	.fill 255,8,0
 666 
	.fill 255,8,0
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	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
 667 
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
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	.fill 254,8,0
 668 
	.fill 254,8,0
656 
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
 669 
	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
657 
 
 670 
 
- 
 
 671 
.section K_DATA_START, "aw", @progbits
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 672 
 
658 
.global bootstrap_gdtr
 673 
.global bootstrap_gdtr
659 
bootstrap_gdtr:
 674 
bootstrap_gdtr:
660 
	.word gdtselector(GDT_ITEMS)
 675 
	.word gdtselector(GDT_ITEMS)
661 
	.long KA2PA(gdt)
 676 
	.long KA2PA(gdt)
662 
 
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