| 1 | ; File name : AH24h_HSetBlocks.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 28.12.2009
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| 4 | ; Last update : 12.4.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Int 13h function AH=24h, Set Multiple Blocks.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Int 13h function AH=24h, Set Multiple Blocks.
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| 13 | ;
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| 14 | ; AH24h_HandlerForSetMultipleBlocks
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| 15 | ; Parameters:
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| 16 | ; AH: Bios function 24h
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| 17 | ; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128)
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| 18 | ; DL: Drive number
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| 19 | ; Parameters loaded by Int13h_Jump:
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| 20 | ; DS: RAMVARS segment
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| 21 | ; Returns:
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| 22 | ; AH: Int 13h return status
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| 23 | ; CF: 0 if succesfull, 1 if error
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| 24 | ; IF: 1
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| 25 | ; Corrupts registers:
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| 26 | ; Flags
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| 27 | ;--------------------------------------------------------------------
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| 28 | ALIGN JUMP_ALIGN
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| 29 | AH24h_HandlerForSetMultipleBlocks:
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| 30 | push dx
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| 31 | push cx
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| 32 | push bx
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| 33 | push ax
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| 34 | call AH24h_SetBlockSize
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| 35 | jmp Int13h_PopXRegsAndReturn
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| 36 |
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| 37 |
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| 38 | ;--------------------------------------------------------------------
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| 39 | ; Sets block size for block mode transfers.
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| 40 | ;
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| 41 | ; AH24h_SetBlockSize
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| 42 | ; Parameters:
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| 43 | ; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128)
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| 44 | ; DL: Drive number
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| 45 | ; DS: RAMVARS segment
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| 46 | ; Returns:
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| 47 | ; DS:DI: Ptr to DPT
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| 48 | ; AH: Int 13h return status
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| 49 | ; CF: 0 if succesfull, 1 if error
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| 50 | ; Corrupts registers:
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| 51 | ; AL, BX, CX, DX, DI
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| 52 | ;--------------------------------------------------------------------
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| 53 | ALIGN JUMP_ALIGN
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| 54 | AH24h_SetBlockSize:
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| 55 | ; Select Master or Slave and wait until ready
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| 56 | mov bl, al ; Backup block size
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| 57 | call FindDPT_ForDriveNumber ; DS:DI now points to DPT
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| 58 | call HDrvSel_SelectDriveAndDisableIRQ ; Select drive and wait until ready
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| 59 | jc SHORT .Return ; Return if error
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| 60 |
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| 61 | ; Output block size and command
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| 62 | mov al, bl ; Restore block size to AL
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| 63 | mov ah, HCMD_SET_MUL ; Load command to AH
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| 64 | mov dx, [RAMVARS.wIdeBase] ; Load base port address
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| 65 | add dx, BYTE REG_IDE_CNT
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| 66 | call HCommand_OutputSectorCountAndCommand
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| 67 | call HStatus_WaitBsyDefTime ; Wait until drive not busy
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| 68 | jc SHORT .DisableBlockMode
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| 69 |
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| 70 | ; Store new block size to DPT and return
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| 71 | mov [di+DPT.bSetBlock], bl ; Store new block size
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| 72 | xor ah, ah ; Zero AH and CF since success
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| 73 | ret
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| 74 | .DisableBlockMode:
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| 75 | mov BYTE [di+DPT.bSetBlock], 1 ; Disable block mode
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| 76 | .Return:
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| 77 | ret
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