kolibrios/kernel/trunk/bootbios.inc

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2024. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; 16 BIT ENTRY FROM BOOTSECTOR ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
os_code = code_l - tmp_gdt
if defined pretest_build
PREBOOT_TIMEOUT = 0 ; seconds
else
PREBOOT_TIMEOUT = 5
end if
use16
org 0
; struct kernel_header
jmp start_of_code ; jump
db 'KolibriOS ' ; signature
db 'v0.7.7.0 ',13,10,13,10,0 ; FIXME: get distribution version from git tag
dd B32-KERNEL_BASE ; offset of the kernel's 32-bit entry point
include "boot/bootstr.inc" ; language-independent boot messages
include "boot/preboot.inc"
; Language support for locales: de_DE, es_ES, ru_RU (CP866), et_EE, en_US.
if lang eq de_DE
include "boot/bootstr-de_DE.inc" ; German system boot messages
else if lang eq es_ES
include "boot/bootstr-es_ES.inc" ; Spanish system boot messages
else if lang eq ru_RU
include "boot/bootstr-ru_RU.inc" ; Russian system boot messages
include "boot/bootfont-ru_RU.inc" ; Russian font
else if lang eq et_EE
include "boot/bootstr-et_EE.inc" ; Estonian system boot messages
include "boot/bootfont-et_EE.inc" ; Estonian font
else
include "boot/bootstr-en_US.inc" ; English system boot messages (default)
end if
include "boot/bootcode.inc" ; 16 bit system boot code
include "bus/pci/pci16.inc"
include "detect/biosdisk.inc"
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; SWITCH TO 32 BIT PROTECTED MODE ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; CR0 Flags - Protected mode and Paging
mov ecx, CR0_PE+CR0_AM
; Enabling 32 bit protected mode
sidt [cs:old_ints_h]
cli ; disable all irqs
cld
mov al, 255 ; mask all irqs
out 0xa1, al
out 0x21, al
l.5:
in al, 0x64 ; Enable A20
test al, 2
jnz l.5
mov al, 0xD1
out 0x64, al
l.6:
in al, 0x64
test al, 2
jnz l.6
mov al, 0xDF
out 0x60, al
l.7:
in al, 0x64
test al, 2
jnz l.7
mov al, 0xFF
out 0x64, al
lgdt [cs:tmp_gdt] ; Load GDT
mov eax, cr0 ; protected mode
or eax, ecx
and eax, 10011111b *65536*256 + 0xffffff ; caching enabled
mov cr0, eax
jmp pword os_code:B32 ; jmp to enable 32 bit mode
align 8
tmp_gdt:
dw 23
dd tmp_gdt+KERNEL_BASE
dw 0
code_l:
dw 0xffff
dw 0x0000
db 0x00
dw 11011111b *256 +10011010b
db 0x00
dw 0xffff
dw 0x0000
db 0x00
dw 11011111b *256 +10010010b
db 0x00
include "data16.inc"
if ~ lang eq es_ES
diff16 "end of bootcode",0,$+KERNEL_BASE
end if