[3] | 1 | ; File name : AH23h_HFeatures.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=23h,
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| 7 | ; Set Controller Features Register.
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| 8 |
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| 9 | ; Section containing code
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| 10 | SECTION .text
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| 11 |
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| 12 | ;--------------------------------------------------------------------
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| 13 | ; Int 13h function AH=23h, Set Controller Features Register.
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| 14 | ;
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| 15 | ; AH23h_HandlerForSetControllerFeatures
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| 16 | ; Parameters:
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| 17 | ; AH: Bios function 23h
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| 18 | ; AL: Feature Number (parameter to Features Register = subcommand)
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| 19 | ; DL: Drive number (8xh)
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| 20 | ; Parameters loaded by Int13h_Jump:
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| 21 | ; DS: RAMVARS segment
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| 22 | ; Parameter registers are undocumented, specific for this BIOS:
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| 23 | ; BH: Parameter to Sector Count Register (subcommand specific)
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| 24 | ; BL: Parameter to Sector Number Register (subcommand specific)
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| 25 | ; CL: Parameter to Low Cylinder Register (subcommand specific)
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| 26 | ; CH: Parameter to High Cylinder Register (subcommand specific)
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| 27 | ; Returns:
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| 28 | ; AH: Int 13h return status
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| 29 | ; CF: 0 if succesfull, 1 if error
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| 30 | ; IF: 1
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| 31 | ; Corrupts registers:
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| 32 | ; Flags
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| 33 | ;--------------------------------------------------------------------
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| 34 | ALIGN JUMP_ALIGN
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| 35 | AH23h_HandlerForSetControllerFeatures:
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| 36 | push dx
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| 37 | push cx
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| 38 | push bx
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| 39 | push ax
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| 40 | push si
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| 41 |
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| 42 | ; Backup AL and BH to SI
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| 43 | mov ah, bh
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| 44 | xchg si, ax
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| 45 |
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| 46 | ; Select Master or Slave and wait until ready
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| 47 | call FindDPT_ForDriveNumber ; DS:DI now points to DPT
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| 48 | call HDrvSel_SelectDriveAndDisableIRQ
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| 49 | jc SHORT .Return ; Return if error
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| 50 |
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| 51 | ; Output Feature Number
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| 52 | mov ax, si ; Feature number to AL
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| 53 | mov dx, [RAMVARS.wIdeBase] ; Load base port address
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| 54 | inc dx ; REGW_IDE_FEAT
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| 55 | out dx, al
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| 56 |
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| 57 | ; Output parameters to Sector Number Register and Cylinder Registers
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| 58 | xor bh, bh ; Zero head number
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| 59 | dec dx ; Back to base port address
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| 60 | call HCommand_OutputTranslatedLCHSaddress
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| 61 |
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| 62 | ; Output parameter to Sector Count Register and command
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| 63 | xchg ax, si ; Sector Count Reg param to AH
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| 64 | mov al, ah ; Sector Count Reg param to AL
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| 65 | mov ah, HCMD_SET_FEAT ; Load Set Features command to AH
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| 66 | call HCommand_OutputSectorCountAndCommand
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| 67 |
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| 68 | call HStatus_WaitBsyDefTime ; Wait until drive ready
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| 69 | .Return:
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| 70 | pop si
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| 71 | jmp Int13h_PopXRegsAndReturn
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