| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=24h, Set Multiple Blocks.
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| 3 |
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| 4 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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| 12 | ;
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| 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; Int 13h function AH=24h, Set Multiple Blocks.
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| 25 | ;
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| 26 | ; AH24h_HandlerForSetMultipleBlocks
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| 27 | ; Parameters:
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| 28 | ; AL: Same as in INTPACK
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| 29 | ; DL: Translated Drive number
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| 30 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 31 | ; SS:BP: Ptr to IDEPACK
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| 32 | ; Parameters on INTPACK:
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| 33 | ; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128)
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| 34 | ; Returns with INTPACK:
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| 35 | ; AH: Int 13h return status
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| 36 | ; CF: 0 if successful, 1 if error
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| 37 | ;--------------------------------------------------------------------
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| 38 | AH24h_HandlerForSetMultipleBlocks:
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| 39 | %ifndef USE_186
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| 40 | call AH24h_SetBlockSize
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| 41 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 42 | %else
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| 43 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 44 | ; Fall to AH24h_SetBlockSize
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| 45 | %endif
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| 46 |
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| 47 |
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| 48 | ;--------------------------------------------------------------------
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| 49 | ; AH24h_SetBlockSize
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| 50 | ; Parameters:
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| 51 | ; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128)
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| 52 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 53 | ; SS:BP: Ptr to IDEPACK
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| 54 | ; Returns:
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| 55 | ; AH: Int 13h return status
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| 56 | ; CF: 0 if successful, 1 if error
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| 57 | ; Corrupts registers:
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| 58 | ; AL, CX, DX
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| 59 | ;--------------------------------------------------------------------
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| 60 | AH24h_SetBlockSize:
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| 61 | %ifdef MODULE_8BIT_IDE_ADVANCED
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| 62 | ; XT-CF does not support largest block size in DMA mode.
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| 63 | cmp al, XTCF_DMA_MODE_MAX_BLOCK_SIZE
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| 64 | jbe SHORT .NoNeedToLimitBlockSize
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| 65 |
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| 66 | ; Return error if we tried too large block for XT-CF.
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| 67 | ; Do not limit it to maximum supported since software calling AH=24h
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| 68 | ; must know what the actual block size is.
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| 69 | cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_XTCF_DMA
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| 70 | je SHORT .DisableBlockMode
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| 71 | .NoNeedToLimitBlockSize:
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| 72 | %endif ; MODULE_8BIT_IDE_ADVANCED
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| 73 |
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| 74 | push bx
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| 75 |
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| 76 | push ax ; Store block size for later use
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| 77 | xchg dx, ax ; DL = Block size (Sector Count Register)
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| 78 | mov al, COMMAND_SET_MULTIPLE_MODE
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| 79 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRDY, FLG_STATUS_DRDY)
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| 80 | call Idepack_StoreNonExtParametersAndIssueCommandFromAL
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| 81 |
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| 82 | ; Disable block mode if failure or if called with block size of 1 sector.
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| 83 | ; Some drives allow block mode commands for 1 sector blocks and some do not.
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| 84 | pop bx ; Pop block size to BL
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| 85 | jc SHORT .DisableBlockMode
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| 86 |
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| 87 | ; All valid block sizes are powers of 2 which means BL have just one bit set (parity odd).
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| 88 | ; Incrementing BX will cause all block sizes except 1 to have two bits set (parity even).
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| 89 | ; Note that PF reflects only the lowest 8 bits of any register being modified.
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| 90 | inc bx ; 1 -> 2 ?
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| 91 | jpo SHORT .DisableBlockMode ; Jump if BL = 2
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| 92 | dec bx ; Restore block size (was larger than 1)
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| 93 |
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| 94 | ; Enable block mode and store block size
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| 95 | or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_USE_BLOCK_MODE_COMMANDS
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| 96 | jmp SHORT .StoreBlockSizeFromBLandReturn
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| 97 |
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| 98 | .DisableBlockMode:
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| 99 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_USE_BLOCK_MODE_COMMANDS
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| 100 | mov bl, 1
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| 101 | stc
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| 102 | .StoreBlockSizeFromBLandReturn:
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| 103 | mov [di+DPT_ATA.bBlockSize], bl
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| 104 | pop bx
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| 105 | ret
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