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kolibrios/kernel/trunk/boot/rdload.inc

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
; READ RAMDISK IMAGE FROM HD
cmp [boot_dev+OS_BASE+0x10000],1
jne no_sys_on_hd
test [DRIVE_DATA+1],byte 0x40
jz position_2
mov [hdbase],0x1f0
mov [hdid],0x0
mov [hdpos],1
mov [fat32part],0
position_1_1:
inc [fat32part]
call search_and_read_image
cmp [image_retrieved],1
je yes_sys_on_hd
movzx eax,byte [DRIVE_DATA+2]
cmp [fat32part],eax
jle position_1_1
position_2:
test [DRIVE_DATA+1],byte 0x10
jz position_3
mov [hdbase],0x1f0
mov [hdid],0x10
mov [hdpos],2
mov [fat32part],0
position_2_1:
inc [fat32part]
call search_and_read_image
cmp [image_retrieved],1
je yes_sys_on_hd
movzx eax,byte [DRIVE_DATA+3]
cmp eax,[fat32part]
jle position_2_1
position_3:
test [DRIVE_DATA+1],byte 0x4
jz position_4
mov [hdbase],0x170
mov [hdid],0x0
mov [hdpos],3
mov [fat32part],0
position_3_1:
inc [fat32part]
call search_and_read_image
cmp [image_retrieved],1
je yes_sys_on_hd
movzx eax,byte [DRIVE_DATA+4]
cmp eax,[fat32part]
jle position_3_1
position_4:
test [DRIVE_DATA+1],byte 0x1
jz no_sys_on_hd
mov [hdbase],0x170
mov [hdid],0x10
mov [hdpos],4
mov [fat32part],0
position_4_1:
inc [fat32part]
call search_and_read_image
cmp [image_retrieved],1
je yes_sys_on_hd
movzx eax,byte [DRIVE_DATA+5]
cmp eax,[fat32part]
jle position_4_1
jmp yes_sys_on_hd
search_and_read_image:
call set_FAT32_variables
mov edx, bootpath
call read_image
test eax, eax
jz image_present
mov edx, bootpath2
call read_image
test eax, eax
jz image_present
ret
image_present:
mov [image_retrieved],1
ret
read_image:
mov eax, hdsysimage+OS_BASE+0x10000
mov ebx, 1474560/512
mov ecx, RAMDISK
mov esi, 0
mov edi, 12
call file_read
ret
image_retrieved db 0
counter_of_partitions db 0
no_sys_on_hd:
; test_to_format_ram_disk (need if not using ram disk)
cmp [boot_dev+OS_BASE+0x10000],3
jne not_format_ram_disk
; format_ram_disk
mov edi, RAMDISK
mov ecx, 0x1080
xor eax,eax
@@:
stosd
loop @b
mov ecx, 0x58F7F
mov eax,0xF6F6F6F6
@@:
stosd
loop @b
mov [RAMDISK+0x200],dword 0xFFFFF0 ; fat table
mov [RAMDISK+0x4200],dword 0xFFFFF0
not_format_ram_disk:
yes_sys_on_hd: