1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Int 13h function AH=9h, Initialize Drive Parameters. |
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3 | |
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4 | ; Section containing code |
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5 | SECTION .text |
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6 | |
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7 | ;-------------------------------------------------------------------- |
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8 | ; Int 13h function AH=9h, Initialize Drive Parameters. |
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9 | ; |
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10 | ; AH9h_HandlerForInitializeDriveParameters |
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11 | ; Parameters: |
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12 | ; DL: Translated Drive number |
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13 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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14 | ; SS:BP: Ptr to IDEPACK |
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15 | ; Returns with INTPACK: |
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16 | ; AH: Int 13h return status |
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17 | ; CF: 0 if succesfull, 1 if error |
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18 | ;-------------------------------------------------------------------- |
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19 | AH9h_HandlerForInitializeDriveParameters: |
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20 | %ifndef USE_186 |
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21 | call AH9h_InitializeDriveForUse |
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22 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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23 | %else |
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24 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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25 | ; Fall to AH9h_InitializeDriveForUse |
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26 | %endif |
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27 | |
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28 | |
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29 | ;-------------------------------------------------------------------- |
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30 | ; Initialized drive to be ready for use. |
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31 | ; |
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32 | ; AH9h_InitializeDriveForUse |
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33 | ; Parameters: |
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34 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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35 | ; SS:BP: Ptr to IDEPACK |
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36 | ; Returns: |
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37 | ; AH: Int 13h return status |
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38 | ; CF: 0 if succesfull, 1 if error |
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39 | ; Corrupts registers: |
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40 | ; AL, BX, DX |
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41 | ;-------------------------------------------------------------------- |
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42 | AH9h_InitializeDriveForUse: |
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43 | push cx |
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44 | |
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45 | %ifdef MODULE_SERIAL |
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46 | ; |
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47 | ; no need to do this for serial deveices, and we use the DPT_RESET flag bits |
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48 | ; to store the drive type for serial floppy drives (MODULE_SERIAL_FLOPPY) |
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49 | ; |
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50 | xor ah, ah |
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51 | test byte [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE ; Clears CF |
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52 | jnz .ReturnNotSuccessfull |
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53 | %endif |
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54 | |
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55 | ; Try to select drive and wait until ready |
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56 | or BYTE [di+DPT.bFlagsHigh], MASKH_DPT_RESET ; Everything uninitialized |
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57 | call AccessDPT_GetDriveSelectByteToAL |
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58 | mov [bp+IDEPACK.bDrvAndHead], al |
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59 | call Device_SelectDrive |
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60 | jc SHORT .ReturnNotSuccessfull |
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61 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nDRDY ; Clear since success |
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62 | |
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63 | ; Initialize CHS parameters if LBA is not used |
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64 | call InitializeDeviceParameters |
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65 | jc SHORT .RecalibrateDrive |
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66 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nINITPRMS |
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67 | |
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68 | ; Recalibrate drive by seeking to cylinder 0 |
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69 | .RecalibrateDrive: |
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70 | call AH11h_RecalibrateDrive |
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71 | jc SHORT .InitializeBlockMode |
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72 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nRECALIBRATE |
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73 | |
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74 | ; Initialize block mode transfers |
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75 | .InitializeBlockMode: |
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76 | call InitializeBlockMode |
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77 | jc SHORT .ReturnNotSuccessfull |
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78 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nSETBLOCK ; Keeps CF clear |
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79 | |
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80 | .ReturnNotSuccessfull: |
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81 | pop cx |
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82 | ret |
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83 | |
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84 | |
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85 | ;-------------------------------------------------------------------- |
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86 | ; InitializeDeviceParameters |
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87 | ; Parameters: |
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88 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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89 | ; SS:BP: Ptr to IDEPACK |
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90 | ; Returns: |
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91 | ; AH: BIOS Error code |
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92 | ; CF: Cleared if succesfull |
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93 | ; Set if any error |
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94 | ; Corrupts registers: |
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95 | ; AL, BX, CX, DX |
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96 | ;-------------------------------------------------------------------- |
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97 | InitializeDeviceParameters: |
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98 | ; No need to initialize CHS parameters if LBA mode enabled |
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99 | test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA ; Clear CF |
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100 | jnz SHORT ReturnSuccessSinceInitializationNotNeeded |
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101 | |
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102 | ; Initialize Logical Sectors per Track and Max Head number |
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103 | mov ah, [di+DPT.bPchsHeads] |
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104 | dec ah ; Max Head number |
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105 | mov dl, [di+DPT.bPchsSectors] ; Sectors per Track |
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106 | mov al, COMMAND_INITIALIZE_DEVICE_PARAMETERS |
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107 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_BSY, FLG_STATUS_BSY) |
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108 | jmp Idepack_StoreNonExtParametersAndIssueCommandFromAL |
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109 | |
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110 | |
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111 | ;-------------------------------------------------------------------- |
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112 | ; InitializeBlockMode |
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113 | ; Parameters: |
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114 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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115 | ; Returns: |
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116 | ; AH: BIOS Error code |
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117 | ; CF: Cleared if succesfull |
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118 | ; Set if any error |
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119 | ; Corrupts registers: |
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120 | ; AL, BX, CX, DX |
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121 | ;-------------------------------------------------------------------- |
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122 | InitializeBlockMode: |
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123 | test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED ; Clear CF |
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124 | jz SHORT ReturnSuccessSinceInitializationNotNeeded |
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125 | |
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126 | mov al, [di+DPT_ATA.bMaxBlock] ; Load max block size, zero AH |
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127 | jmp AH24h_SetBlockSize |
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128 | ReturnSuccessSinceInitializationNotNeeded: |
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129 | ret |
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