[165] | 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=48h, Get Extended Drive Parameters.
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| 3 |
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[376] | 4 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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| 12 | ;
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| 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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[165] | 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; Int 13h function AH=48h, Get Extended Drive Parameters.
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| 25 | ;
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| 26 | ; AH48h_GetExtendedDriveParameters
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| 27 | ; Parameters:
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| 28 | ; SI: Same as in INTPACK
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| 29 | ; DL: Translated Drive number
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| 30 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 31 | ; SS:BP: Ptr to IDEPACK
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| 32 | ; Parameters on INTPACK:
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| 33 | ; DS:SI: Ptr to Extended Drive Information Table to fill
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| 34 | ; Returns with INTPACK:
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| 35 | ; AH: Int 13h return status
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| 36 | ; DS:SI: Ptr to Extended Drive Information Table
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[294] | 37 | ; CF: 0 if successful, 1 if error
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[165] | 38 | ;--------------------------------------------------------------------
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| 39 | AH48h_HandlerForGetExtendedDriveParameters:
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[227] | 40 | call AccessDPT_GetLbaSectorCountToBXDXAX
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[167] | 41 |
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[227] | 42 | ; Point DS:SI to Extended Drive Information Table to fill
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[421] | 43 | push ds
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| 44 | pop es ; DPT now in ES:DI
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[169] | 45 | mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
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[227] | 46 | mov cx, MINIMUM_EDRIVEINFO_SIZE
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| 47 | cmp [si+EDRIVE_INFO.wSize], cx
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[332] | 48 | jb Prepare_ReturnFromInt13hWithInvalidFunctionError
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[167] | 49 | je SHORT .SkipEddConfigurationParameters
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[165] | 50 |
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[167] | 51 | ; We do not support EDD Configuration Parameters so set to FFFF:FFFFh
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[421] | 52 | sub cx, BYTE MINIMUM_EDRIVEINFO_SIZE+1 ; CX => FFFFh
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[227] | 53 | mov [si+EDRIVE_INFO.fpEDDparams], cx
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| 54 | mov [si+EDRIVE_INFO.fpEDDparams+2], cx
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| 55 | mov cx, EDRIVE_INFO_size
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[167] | 56 |
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[227] | 57 | ; Fill Extended Drive Information Table in DS:SI
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[167] | 58 | .SkipEddConfigurationParameters:
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[227] | 59 | mov [si+EDRIVE_INFO.wSize], cx
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[421] | 60 | mov WORD [si+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS | FLG_CHS_INFORMATION_IS_VALID
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[165] | 61 |
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[324] | 62 | ; Store total sector count
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[228] | 63 | mov [si+EDRIVE_INFO.qwTotalSectors], ax
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[227] | 64 | xor ax, ax ; Return with success
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[228] | 65 | mov [si+EDRIVE_INFO.qwTotalSectors+2], dx
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| 66 | mov [si+EDRIVE_INFO.qwTotalSectors+4], bx
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[229] | 67 | mov [si+EDRIVE_INFO.qwTotalSectors+6], ax ; Always zero
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[228] | 68 | mov WORD [si+EDRIVE_INFO.wSectorSize], 512
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[169] | 69 |
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[421] | 70 | ; Store P-CHS
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| 71 | eMOVZX dx, BYTE [es:di+DPT.bPchsHeads]
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| 72 | xor ax, ax ; Also a return code
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| 73 | mov [si+EDRIVE_INFO.dwHeads], dx
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| 74 | mov [si+EDRIVE_INFO.dwHeads+2], ax
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| 75 |
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| 76 | mov dl, [es:di+DPT.bPchsSectorsPerTrack]
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| 77 | mov [si+EDRIVE_INFO.dwSectorsPerTrack], dx
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| 78 | mov [si+EDRIVE_INFO.dwSectorsPerTrack+2], ax
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| 79 |
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| 80 | mov dx, [es:di+DPT.wPchsCylinders]
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| 81 | mov [si+EDRIVE_INFO.dwCylinders], dx
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| 82 | mov [si+EDRIVE_INFO.dwCylinders+2], ax
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| 83 |
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[167] | 84 | .ReturnWithError:
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[165] | 85 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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