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 | ALIGN JUMP_ALIGN
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24 | AH48h_HandlerForGetExtendedDriveParameters:
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25 | ; Get our buffer to ES:SI
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26 | push di
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27 | call FindDPT_ForNewDriveToDSDI
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28 | lea si, [di+LARGEST_DPT_SIZE] ; IdeCommand.asm required fake DPT
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29 | pop di
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30 | push ds
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31 | pop es
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32 |
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33 | ; Get Drive ID and total sector count from it
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34 | call AH25h_GetDriveInformationToBufferInESSI
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35 | jc SHORT .ReturnWithError
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36 | call AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI
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37 | xchg cx, ax ; Sector count now in BX:DX:CX
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38 |
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39 | ; Point ES:DI to Destination buffer
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40 | mov di, [bp+IDEPACK.intpack+INTPACK.si]
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41 | mov es, [bp+IDEPACK.intpack+INTPACK.ds]
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42 | mov ax, MINIMUM_EDRIVEINFO_SIZE
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43 | cmp WORD [es:di+EDRIVE_INFO.wSize], ax
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44 | jb SHORT .BufferTooSmall
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45 | je SHORT .SkipEddConfigurationParameters
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46 |
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47 | ; We do not support EDD Configuration Parameters so set to FFFF:FFFFh
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48 | xor ax, ax
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49 | dec ax ; AX = FFFFh
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50 | mov [es:di+EDRIVE_INFO.fpEDDparams], ax
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51 | mov [es:di+EDRIVE_INFO.fpEDDparams+2], ax
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52 | mov ax, EDRIVE_INFO_size
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53 |
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54 | ; Fill Extended Drive Information Table in ES:DI
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55 | .SkipEddConfigurationParameters:
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56 | stosw ; Store Extended Drive Information Table size
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57 | mov al, FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS
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58 | stosw
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59 | add di, BYTE 12 ; Skip CHS parameters
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60 | xchg ax, cx
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61 | stosw ; LBA WORD 0
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62 | xchg ax, dx
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63 | stosw ; LBA WORD 1
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64 | xchg ax, bx
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65 | stosw ; LBA WORD 2
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66 | xor ax, ax
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67 | stosw ; LBA WORD 3 always zero since 48-bit address
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68 | mov ah, 512>>8
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69 | stosw ; Always 512-byte sectors
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70 |
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71 | ; Return with success
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72 | xor ah, ah
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73 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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74 |
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75 | .BufferTooSmall:
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76 | mov ah, RET_HD_INVALID
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77 | .ReturnWithError:
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78 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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