forked from KolibriOS/kolibrios
140 lines
4.3 KiB
PHP
140 lines
4.3 KiB
PHP
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2013. 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: 3742 $
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search_partitions:
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; 1. Fill missing parameters in HD_DATA structures.
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mov eax, [hd_address_table]
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mov [hd0_data.hdbase], eax ;0x1f0
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mov [hd1_data.hdbase], eax
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mov eax, [hd_address_table+16]
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mov [hd2_data.hdbase], eax
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mov [hd3_data.hdbase], eax
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; 2. Notify the system about /hd* disks.
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; For every existing disk, call ide_disk_add with correct parameters.
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; Generate name "hdN" on the stack; this is 4 bytes including terminating zero.
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; 2a. /hd0: exists if mask 0x40 in [DRIVE_DATA+1] is set,
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; data: hd0_data,
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; number of partitions: [DRIVE_DATA+2]
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test [DRIVE_DATA+1], byte 0x40
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jz @f
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push 'hd0'
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mov eax, esp ; name
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mov edx, hd0_data
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call ide_disk_add
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mov [DRIVE_DATA+2], al
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pop ecx ; restore the stack
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@@:
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; 2b. /hd1: exists if mask 0x10 in [DRIVE_DATA+1] is set,
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; data: hd1_data,
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; number of partitions: [DRIVE_DATA+3]
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test [DRIVE_DATA+1], byte 0x10
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jz @f
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push 'hd1'
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mov eax, esp
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mov edx, hd1_data
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call ide_disk_add
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mov [DRIVE_DATA+3], al
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pop ecx
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@@:
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; 2c. /hd2: exists if mask 4 in [DRIVE_DATA+1] is set,
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; data: hd2_data,
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; number of partitions: [DRIVE_DATA+4]
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test [DRIVE_DATA+1], byte 4
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jz @f
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push 'hd2'
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mov eax, esp
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mov edx, hd2_data
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call ide_disk_add
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mov [DRIVE_DATA+4], al
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pop ecx
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@@:
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; 2d. /hd3: exists if mask 1 in [DRIVE_DATA+1] is set,
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; data: hd3_data,
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; number of partitions: [DRIVE_DATA+5]
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test [DRIVE_DATA+1], byte 1
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jz @f
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push 'hd3'
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mov eax, esp
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mov edx, hd3_data
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call ide_disk_add
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mov [DRIVE_DATA+5], al
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pop ecx
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@@:
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; 3. Notify the system about /bd* disks.
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; 3a. Check whether there are BIOS disks. If no, skip step 3.
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xor esi, esi
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cmp esi, [NumBiosDisks]
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jz .nobd
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; Loop over all disks.
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push 0
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push 'bd'
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.bdloop:
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; 3b. Get the drive number for using in /bd* name.
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movzx eax, byte [BiosDisksData+esi*4]
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sub al, 80h
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; 3c. Convert eax to decimal and store starting with [esp+3].
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; First 2 bytes in [esp] are "bd".
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lea edi, [esp+2]
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; store digits in the stack, ending with -'0'
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push -'0'
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@@:
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xor edx, edx
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iglobal
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align 4
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_10 dd 10
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endg
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div [_10]
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push edx
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test eax, eax
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jnz @b
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; restore digits from the stack, this reverses the order;
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; add '0', stop, when zero is reached
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@@:
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pop eax
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add al, '0'
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stosb
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jnz @b
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; 3e. Call the API with userdata = 80h + ecx.
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mov eax, esp
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lea edx, [esi+80h]
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stdcall disk_add, bd_callbacks, eax, edx, 0
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test eax, eax
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jz @f
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stdcall disk_media_changed, eax, 1
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@@:
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; 3f. Continue the loop.
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inc esi
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cmp esi, [NumBiosDisks]
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jnz .bdloop
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pop ecx ecx ; restore stack after name
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.nobd:
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jmp end_search_partitions
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; Helper procedure for search_partitions, adds one IDE disk.
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; For compatibility, number of partitions for IDE disks is kept in a separate variable,
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; so the procedure returns number of partitions.
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; eax -> name, edx -> disk data
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proc ide_disk_add
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stdcall disk_add, ide_callbacks, eax, edx, 0
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test eax, eax
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jz @f
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push eax
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stdcall disk_media_changed, eax, 1
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pop eax
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mov eax, [eax+DISK.NumPartitions]
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cmp eax, 255
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jbe @f
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mov eax, 255
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@@:
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ret
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endp
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end_search_partitions:
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