1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Functions for detecting drive for the BIOS. |
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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 | ; Detects all IDE hard disks to be controlled by this BIOS. |
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9 | ; |
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10 | ; DetectDrives_FromAllIDEControllers |
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11 | ; Parameters: |
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12 | ; DS: RAMVARS segment |
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13 | ; ES: BDA segment (zero) |
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14 | ; Returns: |
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15 | ; Nothing |
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16 | ; Corrupts registers: |
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17 | ; All (not segments) |
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18 | ;-------------------------------------------------------------------- |
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19 | DetectDrives_FromAllIDEControllers: |
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20 | call RamVars_GetIdeControllerCountToCX |
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21 | mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS |
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22 | |
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23 | .DriveDetectLoop: ; Loop through IDEVARS |
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24 | mov si, g_szDetect ; Setup standard print string |
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25 | %ifdef MODULE_SERIAL |
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26 | cmp byte [cs:bp+IDEVARS.bDevice], DEVICE_SERIAL_PORT |
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27 | jnz .DriveNotSerial ; Special print string for serial drives |
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28 | mov si, g_szDetectCOM |
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29 | .DriveNotSerial: |
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30 | %endif |
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31 | call .DetectDrives_WithIDEVARS ; Detect Master and Slave |
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32 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS |
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33 | loop .DriveDetectLoop |
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34 | |
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35 | %ifdef MODULE_SERIAL |
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36 | call FindDPT_ToDSDIforSerialDevice ; Did we already find any serial drives? |
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37 | jc .done ; Yes, do not scan |
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38 | mov al,[cs:ROMVARS.wFlags] ; Configurator set to always scan? |
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39 | or al,[es:BDA.bKBFlgs1] ; Or, did the user hold down the ALT key? |
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40 | and al,8 ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_ALWAYSDETECT |
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41 | jz .done |
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42 | mov bp, ROMVARS.ideVarsSerialAuto ; Point to our special IDEVARS sructure, just for serial scans |
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43 | mov si, g_szDetectCOMAuto ; Special, special print string for serial drives during a scan |
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44 | ;;; fall-through |
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45 | %else |
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46 | ret |
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47 | %endif |
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48 | |
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49 | %if FLG_ROMVARS_SERIAL_SCANDETECT != 8 |
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50 | %error "DetectDrives is currently coded to assume that FLG_ROMVARS_SERIAL_SCANDETECT is the same bit as the ALT key code in the BDA. Changes in the code will be needed if these values are no longer the same." |
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51 | %endif |
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52 | |
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53 | ;-------------------------------------------------------------------- |
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54 | ; Detects IDE hard disks by using information from IDEVARS. |
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55 | ; |
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56 | ; DetectDrives_WithIDEVARS |
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57 | ; Parameters: |
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58 | ; CS:BP: Ptr to IDEVARS |
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59 | ; DS: RAMVARS segment |
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60 | ; ES: Zero (BDA segment) |
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61 | ; SI: Ptr to template string |
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62 | ; Returns: |
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63 | ; Nothing |
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64 | ; Corrupts registers: |
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65 | ; AX, BX, DX, SI, DI |
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66 | ;-------------------------------------------------------------------- |
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67 | .DetectDrives_WithIDEVARS: |
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68 | push cx |
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69 | |
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70 | push si |
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71 | mov ax, g_szMaster |
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72 | mov bh, MASK_DRVNHEAD_SET ; Select Master drive |
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73 | call StartDetectionWithDriveSelectByteInBHandStringInAX ; Detect and create DPT + BOOTNFO |
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74 | pop si |
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75 | |
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76 | %ifdef MODULE_SERIAL |
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77 | ; |
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78 | ; This block of code checks to see if we found a master during a serial drives scan. If no master |
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79 | ; was found, there is no point in scanning for a slave as the server will not return a slave without a master, |
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80 | ; as there is very little point given the drives are emulated. Performing the slave scan will take |
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81 | ; time to rescan all the COM port and baud rate combinations. |
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82 | ; |
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83 | jnc .masterFound |
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84 | pop cx |
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85 | jcxz .done ; note that CX will only be zero after the .DriveDetectLoop, indicating a serial scan |
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86 | push cx |
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87 | .masterFound: |
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88 | %endif |
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89 | |
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90 | mov ax, g_szSlave |
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91 | mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV |
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92 | call StartDetectionWithDriveSelectByteInBHandStringInAX |
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93 | pop cx |
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94 | |
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95 | .done: |
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96 | ret |
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97 | |
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98 | |
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99 | ;-------------------------------------------------------------------- |
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100 | ; StartDetectionWithDriveSelectByteInBHandStringInAX |
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101 | ; Parameters: |
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102 | ; AX: Offset to "Master" or "Slave" string |
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103 | ; BH: Drive Select byte for Drive and Head Register |
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104 | ; CS:BP: Ptr to IDEVARS for the drive |
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105 | ; DS: RAMVARS segment |
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106 | ; ES: Zero (BDA segment) |
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107 | ; Returns: |
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108 | ; CF: Set on failure, Clear on success |
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109 | ; Note that this is set in the last thing both cases |
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110 | ; do: printing the drive name, or printing "Not Found" |
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111 | ; Corrupts registers: |
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112 | ; AX, BX, CX, DX, SI, DI |
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113 | ;-------------------------------------------------------------------- |
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114 | StartDetectionWithDriveSelectByteInBHandStringInAX: |
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115 | call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP |
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116 | ; Fall to .ReadAtaInfoFromHardDisk |
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117 | |
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118 | ;-------------------------------------------------------------------- |
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119 | ; .ReadAtaInfoFromHardDisk |
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120 | ; Parameters: |
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121 | ; BH: Drive Select byte for Drive and Head Register |
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122 | ; CS:BP: Ptr to IDEVARS for the drive |
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123 | ; DS: RAMVARS segment |
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124 | ; ES: Zero (BDA segment) |
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125 | ; Returns: |
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126 | ; CF: Cleared if ATA-information read successfully |
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127 | ; Set if any error |
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128 | ; Corrupts registers: |
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129 | ; AX, BL, CX, DX, SI, DI |
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130 | ;-------------------------------------------------------------------- |
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131 | .ReadAtaInfoFromHardDisk: |
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132 | mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location |
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133 | push es |
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134 | push si |
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135 | push bx |
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136 | call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH |
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137 | pop bx |
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138 | pop si |
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139 | pop es |
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140 | jnc SHORT CreateBiosTablesForHardDisk |
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141 | ; Fall to .ReadAtapiInfoFromDrive |
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142 | |
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143 | .ReadAtapiInfoFromDrive: ; Not yet implemented |
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144 | ;call ReadAtapiInfoFromDrive ; Assume CD-ROM |
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145 | ;jnc SHORT _CreateBiosTablesForCDROM |
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146 | jmp short DetectDrives_DriveNotFound |
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147 | |
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148 | |
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149 | ;-------------------------------------------------------------------- |
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150 | ; CreateBiosTablesForHardDisk |
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151 | ; Parameters: |
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152 | ; BH: Drive Select byte for Drive and Head Register |
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153 | ; CS:BP: Ptr to IDEVARS for the drive |
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154 | ; ES:SI Ptr to ATA information for the drive |
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155 | ; DS: RAMVARS segment |
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156 | ; ES: BDA/Bootnfo segment |
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157 | ; Returns: |
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158 | ; Nothing |
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159 | ; Corrupts registers: |
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160 | ; AX, BX, CX, DX, SI, DI |
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161 | ;-------------------------------------------------------------------- |
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162 | CreateBiosTablesForHardDisk: |
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163 | call CreateDPT_FromAtaInformation |
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164 | jc SHORT DetectDrives_DriveNotFound |
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165 | call BootInfo_CreateForHardDisk |
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166 | jmp short DetectPrint_DriveNameFromBootnfoInESBX |
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167 | |
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168 | ;-------------------------------------------------------------------- |
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169 | ; DetectDrives_DriveNotFound |
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170 | ; Parameters: |
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171 | ; Nothing |
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172 | ; Returns: |
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173 | ; CF: Set (from BootMenuPrint_NullTerminatedStringFromCSSIandSetCF) |
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174 | ; Corrupts registers: |
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175 | ; AX, SI |
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176 | ;-------------------------------------------------------------------- |
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177 | DetectDrives_DriveNotFound: |
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178 | mov si, g_szNotFound |
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179 | jmp BootMenuPrint_NullTerminatedStringFromCSSIandSetCF |
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180 | |
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