| 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 AH42h_ReturnWithInvalidFunctionError
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| 57 | cmp WORD [es:si+DAP.wSectorCount], BYTE 0
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| 58 | je SHORT AH42h_ReturnWithInvalidFunctionError
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| 59 | ret
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| 60 | AH42h_ReturnWithInvalidFunctionError:
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| 61 | mov ah, RET_HD_INVALID
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| 62 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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