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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