| 1 | ; AiR-BOOT (c) Copyright 1998-2008 M. Kiewitz
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| 2 | ;
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| 3 | ; This file is part of AiR-BOOT
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| 4 | ;
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| 5 | ; AiR-BOOT is free software: you can redistribute it and/or modify it under
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| 6 | ; the terms of the GNU General Public License as published by the Free
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| 7 | ; Software Foundation, either version 3 of the License, or (at your option)
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| 8 | ; any later version.
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| 9 | ;
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| 10 | ; AiR-BOOT is distributed in the hope that it will be useful, but WITHOUT ANY
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| 11 | ; WARRANTY: without even the implied warranty of MERCHANTABILITY or FITNESS
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| 12 | ; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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| 13 | ; details.
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| 14 | ;
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| 15 | ; You should have received a copy of the GNU General Public License along with
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| 16 | ; AiR-BOOT. If not, see <http://www.gnu.org/licenses/>.
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| 17 | ;
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| 18 | ;---------------------------------------------------------------------------
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| 19 | ; AiR-BOOT / EXTENDED PARTITION - M$ HACK-IN
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| 20 | ;---------------------------------------------------------------------------
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| 21 |
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| 22 | ; AiR-BOOT is compatible to the pseudo standard that's is used by an OS on a
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| 23 | ; 32-bit processor, being actually a 16-bit extension that is outperformed
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| 24 | ; by any 8-bit software running on a 4-bit microprocessor, written by a 2-bit
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| 25 | ; company that can't stand 1-bit of competition.
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| 26 |
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| 27 | ; Here is code to change Extended Partition to Type 05h or 0Fh depending
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| 28 | ; on the partition's P-flag including the overall M$hack-Enable Flag.
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| 29 |
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| 30 | IFDEF MODULE_NAMES
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| 31 | DB 'BILLSUXX',0
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| 32 | ENDIF
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| 33 |
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| 34 | MSHACK_ProcessPartTables Proc Near Uses ax dx di
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| 35 | ; Check Overall M$-Hack Enable
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| 36 | test byte ptr [CFG_ExtPartitionMShack], 1
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| 37 | jz MSHPPT_NoMShack
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| 38 |
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| 39 | ; Now check Boot-Entry's flags...
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| 40 | mov ax, 050Fh
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| 41 | test bptr [si+LocIPT_Flags], Flags_ExtPartMShack
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| 42 | jz MSHPPT_ChangeToStandard
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| 43 | mov ax, 0F05h
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| 44 | MSHPPT_ChangeToStandard:
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| 45 |
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| 46 | ; Now process every Primary Partition Table (PPT) for Extended Partition
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| 47 | ; Search for ID *AL* and replace with ID *AH*
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| 48 | mov dl, 80h
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| 49 | mov dh, [TotalHarddiscs]
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| 50 | or dh, dh
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| 51 | jz MSHPPT_NoMShack
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| 52 | MSHPPT_HarddriveLoop:
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| 53 | push ax
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| 54 | push bx
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| 55 | push cx
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| 56 | push dx
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| 57 | xor ax, ax
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| 58 | xor bx, bx ; Location Absolute Sector 0
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| 59 | mov cx, 0001h
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| 60 | xor dh, dh ; Location Cylinder 0, Head 0, Sector 1 MBR/PPT
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| 61 | call DriveIO_LoadPartition
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| 62 | pop dx
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| 63 | pop cx
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| 64 | pop bx
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| 65 | pop ax
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| 66 | jc MSHPPT_Failure
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| 67 |
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| 68 | ; Search for ID in AL and exchange with ID in AH
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| 69 | mov di, offset PartitionSector+446 ; ES:DI - 1st partition entry
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| 70 | MSHPPT_ScanLoop:
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| 71 | cmp al, bptr es:[di+4]
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| 72 | je MSHPPT_GotHit
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| 73 | add di, LocBRPT_LenOfEntry ; 16 Bytes per Partition-Entry
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| 74 | cmp di, 500+offset PartitionSector
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| 75 | jb MSHPPT_ScanLoop
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| 76 | jmp MSHPPT_Failure
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| 77 |
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| 78 | MSHPPT_GotHit:
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| 79 | mov bptr es:[di+4], ah
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| 80 | IFDEF ReleaseCode
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| 81 | call DriveIO_SavePartition
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| 82 | ENDIF
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| 83 | MSHPPT_Failure:
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| 84 | inc dl
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| 85 | dec dh
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| 86 | jnz MSHPPT_HarddriveLoop
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| 87 |
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| 88 | MSHPPT_NoMShack:
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| 89 | ret
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| 90 | MSHACK_ProcessPartTables EndP
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