WebSVN – Kolibri OS – Diff – /kernel/trunk/blkdev/disk.inc



;; Copyright (C) KolibriOS team 2011-2015. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License    ;;
;;                                                              ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

 

$Revision: 6828 $
 
; =============================================================================
; ================================= Constants =================================

        HeaderSize               dd ?
; Size of this header in bytes, must fit to one sector.
        HeaderCRC32              dd ?
; Set this field to zero, compute CRC32 via 0xEDB88320, compare.
        Reserved                 dd ?
; Must be zero.
        MyLBA                    dq ?
; LBA of the sector containing this GPT header.
        AlternateLBA             dq ?
; LBA of the sector containing the other GPT header.
; AlternateLBA of Primary GPTH points to Backup one and vice versa.

 
 
; This function is called from disk_scan_partitions to validate and parse
; primary and backup GPTs.
proc disk_scan_gpt
        push    ecx
; Scan primary GPT (second sector)
        stdcall scan_gpt, 1, 0
        test    eax, eax

        test    eax, eax
        jz      .exit
        DEBUGF  1, 'K : Backup GPT is also corrupt, fallback to legacy MBR\n'
.exit:
; Return value is ZF
        pop     ecx
        ret
endp

 

        div     [esi+DISK.MediaInfo.SectorSize]
        push    eax     ; esp = pointer to the number of sectors
        mov     al, DISKFUNC.read
        stdcall disk_call_driver, edi, dword[ebx+GPTH.PartitionEntryLBA+0], \
                dword[ebx+GPTH.PartitionEntryLBA+4], esp
 
        test    eax, eax
        pop     eax
        jnz     .fail_free_gpea_gpt
; Compute and check CRC32 of GPEA
        mov     edx, [ebx+GPTH.PartitionEntryArrayCRC32]
        mov     eax, -1
        stdcall crc_32, 0xEDB88320, edi, [GPEA_len]

 
; ecx = pointer to partition records array (MBR + 446)
is_protective_mbr:
        push    ecx edi
        xor     eax, eax
;        cmp     [ecx-6], eax
;        jnz     .exit
        cmp     [ecx-2], ax
        jnz     .exit
; Partition record 0 has specific fields
        cmp     [ecx+0], al
        jnz     .exit
        cmp     byte[ecx+4], 0xEE
        jnz     .exit
        cmp     dword[ecx+8], 1

Rev 6827	Rev 6828
Line 3...	Line 3...
3	;; Copyright (C) KolibriOS team 2011-2015. All rights reserved. ;;	3	;; Copyright (C) KolibriOS team 2011-2015. All rights reserved. ;;
4	;; Distributed under terms of the GNU General Public License ;;	4	;; Distributed under terms of the GNU General Public License ;;
5	;; ;;	5	;; ;;
6	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;	6	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Line 7...	Line 7...
7		7
Line 8...	Line 8...
8	$Revision: 6827 $	8	$Revision: 6828 $
9		9
10	; =============================================================================	10	; =============================================================================
11	; ================================= Constants =================================	11	; ================================= Constants =================================
Line 225...	Line 225...
225	HeaderSize dd ?	225	HeaderSize dd ?
226	; Size of this header in bytes, must fit to one sector.	226	; Size of this header in bytes, must fit to one sector.
227	HeaderCRC32 dd ?	227	HeaderCRC32 dd ?
228	; Set this field to zero, compute CRC32 via 0xEDB88320, compare.	228	; Set this field to zero, compute CRC32 via 0xEDB88320, compare.
229	Reserved dd ?	229	Reserved dd ?
230	; Myst be zero.	230	; Must be zero.
231	MyLBA dq ?	231	MyLBA dq ?
232	; LBA of the sector containing this GPT header.	232	; LBA of the sector containing this GPT header.
233	AlternateLBA dq ?	233	AlternateLBA dq ?
234	; LBA of the sector containing the other GPT header.	234	; LBA of the sector containing the other GPT header.
235	; AlternateLBA of Primary GPTH points to Backup one and vice versa.	235	; AlternateLBA of Primary GPTH points to Backup one and vice versa.
Line 844...	Line 844...
844		844
845		845
846	; This function is called from disk_scan_partitions to validate and parse	846	; This function is called from disk_scan_partitions to validate and parse
-		847	; primary and backup GPTs.
847	; primary and backup GPTs.	848	proc disk_scan_gpt
848	proc disk_scan_gpt	849	push ecx
849	; Scan primary GPT (second sector)	850	; Scan primary GPT (second sector)
850	stdcall scan_gpt, 1, 0	851	stdcall scan_gpt, 1, 0
851	test eax, eax	852	test eax, eax
Line 862...	Line 863...
862	test eax, eax	863	test eax, eax
863	jz .exit	864	jz .exit
864	DEBUGF 1, 'K : Backup GPT is also corrupt, fallback to legacy MBR\n'	865	DEBUGF 1, 'K : Backup GPT is also corrupt, fallback to legacy MBR\n'
865	.exit:	866	.exit:
866	; Return value is ZF	867	; Return value is ZF
-		868	pop ecx
867	ret	869	ret
868	endp	870	endp
Line 869...	Line 871...
869		871
Line 953...	Line 955...
953	div [esi+DISK.MediaInfo.SectorSize]	955	div [esi+DISK.MediaInfo.SectorSize]
954	push eax ; esp = pointer to the number of sectors	956	push eax ; esp = pointer to the number of sectors
955	mov al, DISKFUNC.read	957	mov al, DISKFUNC.read
956	stdcall disk_call_driver, edi, dword[ebx+GPTH.PartitionEntryLBA+0], \	958	stdcall disk_call_driver, edi, dword[ebx+GPTH.PartitionEntryLBA+0], \
957	dword[ebx+GPTH.PartitionEntryLBA+4], esp	959	dword[ebx+GPTH.PartitionEntryLBA+4], esp
958	pop ecx	-
959	test eax, eax	960	test eax, eax
-		961	pop eax
960	jnz .fail_free_gpea_gpt	962	jnz .fail_free_gpea_gpt
961	; Compute and check CRC32 of GPEA	963	; Compute and check CRC32 of GPEA
962	mov edx, [ebx+GPTH.PartitionEntryArrayCRC32]	964	mov edx, [ebx+GPTH.PartitionEntryArrayCRC32]
963	mov eax, -1	965	mov eax, -1
964	stdcall crc_32, 0xEDB88320, edi, [GPEA_len]	966	stdcall crc_32, 0xEDB88320, edi, [GPEA_len]
Line 1007...	Line 1009...
1007		1009
1008	; ecx = pointer to partition records array (MBR + 446)	1010	; ecx = pointer to partition records array (MBR + 446)
1009	is_protective_mbr:	1011	is_protective_mbr:
1010	push ecx edi	1012	push ecx edi
1011	xor eax, eax	1013	xor eax, eax
1012	cmp [ecx-6], eax	1014	; cmp [ecx-6], eax
1013	jnz .exit	1015	; jnz .exit
1014	cmp [ecx-2], eax	1016	cmp [ecx-2], ax
1015	jnz .exit	1017	jnz .exit
1016	; Partition record 0 has specific fields	1018	; Partition record 0 has specific fields
1017	cmp dword[ecx+0], 0x00020000	1019	cmp [ecx+0], al
1018	jnz .exit	1020	jnz .exit
1019	cmp byte[ecx+4], 0xEE	1021	cmp byte[ecx+4], 0xEE
1020	jnz .exit	1022	jnz .exit
1021	cmp dword[ecx+8], 1	1023	cmp dword[ecx+8], 1

Subversion Repositories Kolibri OS

(root)/kernel/trunk/blkdev/disk.inc – Rev 6827 → 6828