| 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Int 13h function AH=2h, Read Disk 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=2h, Read Disk Sectors. |
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| 9 | ; |
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| 10 | ; AH2h_HandlerForReadDiskSectors |
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| 11 | ; Parameters: |
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| 12 | ; AL, CX, DH, ES: 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 | ; AL: Number of sectors to read (1...255) |
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| 18 | ; CH: Cylinder number, bits 7...0 |
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| 19 | ; CL: Bits 7...6: Cylinder number bits 9 and 8 |
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| 20 | ; Bits 5...0: Starting sector number (1...63) |
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| 21 | ; DH: Starting head number (0...255) |
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| 22 | ; ES:BX: Pointer to buffer recieving data |
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| 23 | ; Returns with INTPACK: |
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| 24 | ; AH: Int 13h/40h floppy return status |
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| 25 | ; AL: Burst error length if AH returns 11h, undefined otherwise |
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| 26 | ; CF: 0 if successfull, 1 if error |
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| 27 | ;-------------------------------------------------------------------- |
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| 28 | ALIGN JUMP_ALIGN |
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| 29 | AH2h_HandlerForReadDiskSectors: |
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| 30 | call AH2h_ExitInt13hIfSectorCountInIntpackIsZero |
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| 31 | mov ah, COMMAND_READ_SECTORS ; Load sector mode command |
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| 32 | test WORD [di+DPT.wFlags], FLG_DPT_BLOCK_MODE_SUPPORTED |
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| 33 | eCMOVNZ ah, COMMAND_READ_MULTIPLE ; Load block mode command |
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| 34 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ) |
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| 35 | mov si, [bp+IDEPACK.intpack+INTPACK.bx] |
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| 36 | %ifdef USE_186 |
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| 37 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 38 | jmp Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH |
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| 39 | %else |
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| 40 | call Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH |
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| 41 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 42 | %endif |
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| 43 | |
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| 44 | |
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| 45 | ;-------------------------------------------------------------------- |
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| 46 | ; AH2h_ExitInt13hIfSectorCountInIntpackIsZero |
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| 47 | ; Parameters: |
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| 48 | ; SS:BP: Ptr to IDEPACK |
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| 49 | ; Parameters on INTPACK: |
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| 50 | ; AL: Number of sectors to transfer (1...255) |
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| 51 | ; Returns: |
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| 52 | ; Nothing (does not return if error) |
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| 53 | ; Corrupts registers: |
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| 54 | ; Nothing |
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| 55 | ;-------------------------------------------------------------------- |
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| 56 | ALIGN JUMP_ALIGN |
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| 57 | AH2h_ExitInt13hIfSectorCountInIntpackIsZero: |
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| 58 | cmp BYTE [bp+IDEPACK.intpack+INTPACK.al], 0 |
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| 59 | je SHORT .InvalidSectorCount |
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| 60 | ret |
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| 61 | .InvalidSectorCount: |
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| 62 | mov ah, RET_HD_INVALID |
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| 63 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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