[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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[526] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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[526] | 12 | ; |
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[376] | 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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[526] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 18 | ; |
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[376] | 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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[530] | 60 | mov WORD [si+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS |
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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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| 64 | mov [si+EDRIVE_INFO.qwTotalSectors+2], dx |
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| 65 | mov [si+EDRIVE_INFO.qwTotalSectors+4], bx |
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[530] | 66 | xor cx, cx |
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| 67 | mov [si+EDRIVE_INFO.qwTotalSectors+6], cx ; 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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[530] | 70 | ; Store P-CHS. Based on phoenix specification this is returned only if |
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| 71 | ; total sector count is 15,482,880 or less. |
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| 72 | sub ax, 4001h |
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| 73 | sbb dx, 0ECh |
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| 74 | sbb bx, cx ; Zero |
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| 75 | jnc SHORT .ReturnWithSuccess ; More than EC4000h |
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| 76 | or WORD [si+EDRIVE_INFO.wFlags], FLG_CHS_INFORMATION_IS_VALID |
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| 77 | |
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[421] | 78 | eMOVZX dx, BYTE [es:di+DPT.bPchsHeads] |
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| 79 | mov [si+EDRIVE_INFO.dwHeads], dx |
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[530] | 80 | mov [si+EDRIVE_INFO.dwHeads+2], cx |
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[421] | 81 | |
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| 82 | mov dl, [es:di+DPT.bPchsSectorsPerTrack] |
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| 83 | mov [si+EDRIVE_INFO.dwSectorsPerTrack], dx |
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[530] | 84 | mov [si+EDRIVE_INFO.dwSectorsPerTrack+2], cx |
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[421] | 85 | |
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| 86 | mov dx, [es:di+DPT.wPchsCylinders] |
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| 87 | mov [si+EDRIVE_INFO.dwCylinders], dx |
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[530] | 88 | mov [si+EDRIVE_INFO.dwCylinders+2], cx |
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[421] | 89 | |
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[530] | 90 | .ReturnWithSuccess: |
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| 91 | xor ax, ax |
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[167] | 92 | .ReturnWithError: |
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[165] | 93 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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