| 1 | ; File name : HCommand.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 28.3.2010
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| 4 | ; Last update : 16.4.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for outputting IDE commands and parameters.
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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 | ; Outputs sector count, L-CHS address and command to IDE registers.
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| 13 | ; This function does not wait until command has been completed.
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| 14 | ;
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| 15 | ; HCommand_OutputCountAndLCHSandCommand
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| 16 | ; Parameters:
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| 17 | ; AH: Seek or data transfer command
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| 18 | ; AL: Sector count (1...255, 0=256)
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| 19 | ; CH: Cylinder number, bits 7...0
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| 20 | ; CL: Bits 7...6: Cylinder number bits 9 and 8
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| 21 | ; Bits 5...0: Starting sector number (1...63)
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| 22 | ; DH: Starting head number (0...255)
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| 23 | ; DS:DI: Ptr to DPT
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| 24 | ; Returns:
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| 25 | ; AH: BIOS Error code (if error)
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| 26 | ; CF: 0 if succesfull
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| 27 | ; 1 if any error
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| 28 | ; Corrupts registers:
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| 29 | ; CX, DX
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| 30 | ;--------------------------------------------------------------------
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| 31 | ALIGN JUMP_ALIGN
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| 32 | HCommand_OutputCountAndLCHSandCommand:
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| 33 | push bx
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| 34 | push ax ; Store sector count and command
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| 35 | call HDrvSel_SelectDriveForDataTransfer
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| 36 | jc SHORT .ReturnError
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| 37 | call HIRQ_ClearTaskFlag
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| 38 | call HAddress_ConvertParamsFromBiosLCHStoIDE
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| 39 | mov dx, [RAMVARS.wIdeBase] ; Load IDE Base Port address
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| 40 | call HCommand_OutputTranslatedLCHSaddress ; DX to Sector count register
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| 41 | pop ax ; Restore sector count and command
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| 42 | call HCommand_OutputSectorCountAndCommand
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| 43 |
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| 44 | clc ; Clear CF since success
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| 45 | pop bx
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| 46 | ret
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| 47 | .ReturnError:
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| 48 | pop bx ; Discard pushed AX
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| 49 | pop bx
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| 50 | ret
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| 51 |
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| 52 |
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| 53 | ;--------------------------------------------------------------------
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| 54 | ; Outputs L-CHS address that has been translated P-CHS or LBA28
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| 55 | ; when necessary.
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| 56 | ;
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| 57 | ; HCommand_OutputTranslatedLCHSaddress
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| 58 | ; Parameters:
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| 59 | ; BL: LBA Low Register / Sector Number Register (LBA 7...0)
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| 60 | ; CL: LBA Mid Register / Low Cylinder Register (LBA 15...8)
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| 61 | ; CH: LBA High Register / High Cylinder Register (LBA 23...16)
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| 62 | ; BH: Drive and Head Register (LBA 27...24)
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| 63 | ; DX: IDE Base Port address
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| 64 | ; DS:DI: Ptr to DPT
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| 65 | ; Returns:
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| 66 | ; DX: IDE Sector Count Register address
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| 67 | ; Corrupts registers:
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| 68 | ; AX, CX
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| 69 | ;--------------------------------------------------------------------
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| 70 | ALIGN JUMP_ALIGN
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| 71 | HCommand_OutputTranslatedLCHSaddress:
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| 72 | add dx, BYTE REG_IDE_LBA_LOW
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| 73 | mov al, bl
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| 74 | out dx, al ; Output LBA 7...0
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| 75 |
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| 76 | ; Some (VLB) controllers fail to accept WORD write to cylinder
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| 77 | ; registers so we must output two bytes instead.
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| 78 | inc dx ; REG_IDE_LBA_MID
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| 79 | mov al, cl
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| 80 | out dx, al ; Output LBA 8...15
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| 81 |
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| 82 | inc dx ; REG_IDE_LBA_HIGH
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| 83 | mov al, ch
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| 84 | out dx, al ; Output LBA 16...23
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| 85 |
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| 86 | inc dx ; REG_IDE_DRVHD
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| 87 | mov al, [di+DPT.bDrvSel] ; Load other bits for Drive and Head Register
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| 88 | or al, bh
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| 89 | out dx, al ; Output LBA 27...24
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| 90 |
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| 91 | sub dx, BYTE REG_IDE_DRVHD-REG_IDE_CNT
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| 92 | ret
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| 93 |
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| 94 |
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| 95 | ;--------------------------------------------------------------------
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| 96 | ; Outputs sector count and seek or data transfer command.
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| 97 | ;
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| 98 | ; HCommand_OutputSectorCountAndCommand
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| 99 | ; Parameters:
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| 100 | ; AH: Seek or data transfer command
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| 101 | ; AL: Sector count (1...255, 0=256)
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| 102 | ; DX: IDE Sector Count Register address
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| 103 | ; Returns:
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| 104 | ; Nothing
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| 105 | ; Corrupts registers:
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| 106 | ; AH, DX
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| 107 | ;--------------------------------------------------------------------
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| 108 | ALIGN JUMP_ALIGN
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| 109 | HCommand_OutputSectorCountAndCommand:
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| 110 | out dx, al ; Output sector count
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| 111 | add dx, BYTE REGW_IDE_CMD-REG_IDE_CNT
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| 112 | xchg al, ah ; AL=Command, AH=Sector count
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| 113 | out dx, al
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| 114 | mov al, ah ; Restore sector count to AL
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| 115 | jmp SoftDelay_BeforePollingStatusRegister
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