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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4 | ; |
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5 | ; XTIDE Universal BIOS and Associated Tools |
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6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 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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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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37 | ; CF: 0 if successful, 1 if error |
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38 | ;-------------------------------------------------------------------- |
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39 | AH48h_HandlerForGetExtendedDriveParameters: |
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40 | call AccessDPT_GetLbaSectorCountToBXDXAX |
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41 | |
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42 | ; Point DS:SI to Extended Drive Information Table to fill |
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43 | push ds |
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44 | pop es ; DPT now in ES:DI |
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45 | mov ds, [bp+IDEPACK.intpack+INTPACK.ds] |
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46 | mov cx, MINIMUM_EDRIVEINFO_SIZE |
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47 | cmp [si+EDRIVE_INFO.wSize], cx |
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48 | jb Prepare_ReturnFromInt13hWithInvalidFunctionError |
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49 | je SHORT .SkipEddConfigurationParameters |
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50 | |
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51 | ; We do not support EDD Configuration Parameters so set to FFFF:FFFFh |
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52 | sub cx, BYTE MINIMUM_EDRIVEINFO_SIZE+1 ; CX => FFFFh |
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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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56 | |
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57 | ; Fill Extended Drive Information Table in DS:SI |
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58 | .SkipEddConfigurationParameters: |
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59 | mov [si+EDRIVE_INFO.wSize], cx |
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60 | mov WORD [si+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS | FLG_CHS_INFORMATION_IS_VALID |
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61 | |
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62 | ; Store total sector count |
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63 | mov [si+EDRIVE_INFO.qwTotalSectors], ax |
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64 | xor ax, ax ; Return with success |
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65 | mov [si+EDRIVE_INFO.qwTotalSectors+2], dx |
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66 | mov [si+EDRIVE_INFO.qwTotalSectors+4], bx |
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67 | mov [si+EDRIVE_INFO.qwTotalSectors+6], ax ; Always zero |
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68 | mov WORD [si+EDRIVE_INFO.wSectorSize], 512 |
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69 | |
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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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84 | .ReturnWithError: |
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85 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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