1 | ; Project name : XTIDE Universal BIOS
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2 | ; Description : Int 13h function AH=42h, Extended Read Sectors.
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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=42h, Extended Read Sectors.
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9 | ;
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10 | ; AH42h_HandlerForExtendedReadSectors
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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 Disk Address Packet
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18 | ; Returns with INTPACK:
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19 | ; AH: Int 13h return status
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20 | ; CF: 0 if succesfull, 1 if error
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21 | ; Return with Disk Address Packet in INTPACK:
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22 | ; .bSectorCount Number of sectors read successfully
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23 | ;--------------------------------------------------------------------
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24 | ALIGN JUMP_ALIGN
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25 | AH42h_HandlerForExtendedReadSectors:
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26 | call AH42h_LoadDapToESSIandVerifyForTransfer
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27 | call CommandLookup_GetEbiosIndexToBX
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28 | mov ah, [cs:bx+g_rgbReadCommandLookup]
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29 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
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30 | %ifdef USE_186
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31 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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32 | jmp Idepack_ConvertDapToIdepackAndIssueCommandFromAH
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33 | %else
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34 | call Idepack_ConvertDapToIdepackAndIssueCommandFromAH
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35 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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36 | %endif
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37 |
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38 |
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39 | ;--------------------------------------------------------------------
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40 | ; AH42h_LoadDapToESSIandVerifyForTransfer
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41 | ; Parameters:
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42 | ; SI: Same as in INTPACK
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43 | ; SS:BP: Ptr to IDEPACK
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44 | ; Parameters on INTPACK:
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45 | ; DS:SI: Ptr to Disk Address Packet
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46 | ; Returns:
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47 | ; ES:SI: Ptr to Disk Address Packet (DAP)
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48 | ; Exits from INT 13h if invalid DAP
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49 | ; Corrupts registers:
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50 | ; Nothing
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51 | ;--------------------------------------------------------------------
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52 | ALIGN JUMP_ALIGN
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53 | AH42h_LoadDapToESSIandVerifyForTransfer:
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54 | mov es, [bp+IDEPACK.intpack+INTPACK.ds] ; ES:SI to point Disk Address Packet
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55 | cmp BYTE [es:si+DAP.bSize], MINIMUM_DAP_SIZE
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56 | jb SHORT .DapContentsNotValid
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57 | cmp WORD [es:si+DAP.wSectorCount], BYTE 0
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58 | jle SHORT .DapContentsNotValid ; Must be 1...127
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59 | ret
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60 | .DapContentsNotValid:
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61 | jmp AH2h_ExitInt13hSinceSectorCountInIntpackIsZero
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