121 lines
3.6 KiB
PHP
121 lines
3.6 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2024. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; 16 BIT ENTRY FROM BOOTSECTOR ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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os_code = code_l - tmp_gdt
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if defined pretest_build
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PREBOOT_TIMEOUT = 0 ; seconds
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else
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PREBOOT_TIMEOUT = 5
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end if
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use16
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org 0
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; struct kernel_header
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jmp start_of_code ; jump
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db 'KolibriOS ' ; signature
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db 'v0.7.7.0+ ',13,10,13,10,0 ; version
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dd B32-KERNEL_BASE ; offset of the kernel's 32-bit entry point
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include "boot/bootstr.inc" ; language-independent boot messages
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include "boot/preboot.inc"
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if lang eq ge
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include "boot/bootge.inc" ; german system boot messages
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else if lang eq sp
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include "boot/bootsp.inc" ; spanish system boot messages
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else if lang eq ru
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include "boot/bootru.inc" ; russian system boot messages
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include "boot/ru.inc" ; Russian font
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else if lang eq et
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include "boot/bootet.inc" ; estonian system boot messages
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include "boot/et.inc" ; Estonian font
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else
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include "boot/booten.inc" ; english system boot messages
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end if
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include "boot/bootcode.inc" ; 16 bit system boot code
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include "bus/pci/pci16.inc"
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include "detect/biosdisk.inc"
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; SWITCH TO 32 BIT PROTECTED MODE ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; CR0 Flags - Protected mode and Paging
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mov ecx, CR0_PE+CR0_AM
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; Enabling 32 bit protected mode
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sidt [cs:old_ints_h]
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cli ; disable all irqs
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cld
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mov al, 255 ; mask all irqs
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out 0xa1, al
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out 0x21, al
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l.5:
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in al, 0x64 ; Enable A20
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test al, 2
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jnz l.5
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mov al, 0xD1
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out 0x64, al
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l.6:
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in al, 0x64
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test al, 2
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jnz l.6
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mov al, 0xDF
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out 0x60, al
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l.7:
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in al, 0x64
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test al, 2
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jnz l.7
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mov al, 0xFF
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out 0x64, al
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lgdt [cs:tmp_gdt] ; Load GDT
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mov eax, cr0 ; protected mode
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or eax, ecx
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and eax, 10011111b *65536*256 + 0xffffff ; caching enabled
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mov cr0, eax
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jmp pword os_code:B32 ; jmp to enable 32 bit mode
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align 8
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tmp_gdt:
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dw 23
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dd tmp_gdt+KERNEL_BASE
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dw 0
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code_l:
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dw 0xffff
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dw 0x0000
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db 0x00
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dw 11011111b *256 +10011010b
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db 0x00
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dw 0xffff
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dw 0x0000
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db 0x00
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dw 11011111b *256 +10010010b
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db 0x00
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include "data16.inc"
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if ~ lang eq sp
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diff16 "end of bootcode",0,$+KERNEL_BASE
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end if
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