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 | ; Section containing code
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5 | SECTION .text
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6 |
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7 | ;--------------------------------------------------------------------
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8 | ; Int 13h function AH=48h, Get Extended Drive Parameters.
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9 | ;
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10 | ; AH48h_GetExtendedDriveParameters
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11 | ; Parameters:
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12 | ; SI: Same as in INTPACK
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13 | ; DL: Translated Drive number
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14 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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15 | ; SS:BP: Ptr to IDEPACK
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16 | ; Parameters on INTPACK:
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17 | ; DS:SI: Ptr to Extended Drive Information Table to fill
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18 | ; Returns with INTPACK:
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19 | ; AH: Int 13h return status
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20 | ; DS:SI: Ptr to Extended Drive Information Table
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21 | ; CF: 0 if succesfull, 1 if error
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22 | ;--------------------------------------------------------------------
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23 | AH48h_HandlerForGetExtendedDriveParameters:
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24 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
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25 | push bx
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26 | call AccessDPT_GetLbaSectorCountToBXDXAX
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27 | pop di ; CS:DI now points to DRVPARAMS
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28 |
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29 | ; Point DS:SI to Extended Drive Information Table to fill
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30 | mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
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31 | mov cx, MINIMUM_EDRIVEINFO_SIZE
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32 | cmp [si+EDRIVE_INFO.wSize], cx
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33 | jb SHORT Prepare_ReturnFromInt13hWithInvalidFunctionError
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34 | je SHORT .SkipEddConfigurationParameters
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35 |
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36 | ; We do not support EDD Configuration Parameters so set to FFFF:FFFFh
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37 | mov cx, -1 ; FFFFh
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38 | mov [si+EDRIVE_INFO.fpEDDparams], cx
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39 | mov [si+EDRIVE_INFO.fpEDDparams+2], cx
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40 | mov cx, EDRIVE_INFO_size
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41 |
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42 | ; Fill Extended Drive Information Table in DS:SI
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43 | .SkipEddConfigurationParameters:
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44 | mov [si+EDRIVE_INFO.wSize], cx
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45 | mov WORD [si+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS
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46 |
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47 | ; Limit LBA if necessary
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48 | test BYTE [cs:di+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERLBA
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49 | jz SHORT .StoreTotalSectorsFromBXDXAX
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50 | test bx, bx
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51 | jnz SHORT .LimitTotalSectors
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52 | cmp dx, [cs:di+DRVPARAMS.dwMaximumLBA+2]
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53 | jb SHORT .StoreTotalSectorsFromBXDXAX ; Real size less than max
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54 | ja SHORT .LimitTotalSectors
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55 | cmp ax, [cs:di+DRVPARAMS.dwMaximumLBA]
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56 | jbe SHORT .StoreTotalSectorsFromBXDXAX ; Real size less than max
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57 |
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58 | .LimitTotalSectors:
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59 | xor bx, bx
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60 | mov ax, [cs:di+DRVPARAMS.dwMaximumLBA]
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61 | mov dx, [cs:di+DRVPARAMS.dwMaximumLBA+2]
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62 |
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63 | .StoreTotalSectorsFromBXDXAX:
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64 | mov [si+EDRIVE_INFO.qwTotalSectors], ax
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65 | xor ax, ax ; Return with success
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66 | mov [si+EDRIVE_INFO.qwTotalSectors+2], dx
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67 | mov [si+EDRIVE_INFO.qwTotalSectors+4], bx
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68 | mov [si+EDRIVE_INFO.qwTotalSectors+6], ax
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69 | mov WORD [si+EDRIVE_INFO.wSectorSize], 512
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70 |
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71 | .ReturnWithError:
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72 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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