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 | |
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32 | call .DetectDrives_WithIDEVARS ; Detect Master and Slave |
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33 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS |
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34 | loop .DriveDetectLoop |
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35 | |
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36 | %ifdef MODULE_SERIAL |
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37 | ; |
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38 | ; if serial drive detected, do not scan (avoids duplicate drives and isn't needed - we have a connection) |
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39 | ; Note that XLATEVARS.bLastSerial is zero'd in RamVars_Initialize, called in Initialize_AutoDetectDrives; |
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40 | ; bLastSerial it set in the detection code of SerialCommand.asm |
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41 | ; |
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42 | cmp byte [RAMVARS.xlateVars+XLATEVARS.bLastSerial],cl ; cx = zero after the loop above |
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43 | ; less instruction bytes than using immediate |
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44 | jnz .done |
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45 | |
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46 | mov al,[cs:ROMVARS.wFlags] ; Configurator set to always scan? |
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47 | or al,[es:BDA.bKBFlgs1] ; Or, did the user hold down the ALT key? |
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48 | and al,8 ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_ALWAYSDETECT |
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49 | jz .done |
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50 | |
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51 | mov bp, ROMVARS.ideVarsSerialAuto ; Point to our special IDEVARS sructure, just for serial scans |
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52 | mov si, g_szDetectCOMAuto ; Special, special print string for serial drives during a scan |
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53 | ;;; fall-through |
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54 | %else |
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55 | ret |
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56 | %endif |
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57 | |
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58 | %if FLG_ROMVARS_SERIAL_SCANDETECT != 8 |
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59 | %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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60 | %endif |
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61 | |
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62 | ;-------------------------------------------------------------------- |
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63 | ; Detects IDE hard disks by using information from IDEVARS. |
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64 | ; |
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65 | ; DetectDrives_WithIDEVARS |
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66 | ; Parameters: |
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67 | ; CS:BP: Ptr to IDEVARS |
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68 | ; DS: RAMVARS segment |
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69 | ; ES: Zero (BDA segment) |
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70 | ; SI: Ptr to template string |
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71 | ; Returns: |
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72 | ; Nothing |
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73 | ; Corrupts registers: |
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74 | ; AX, BX, DX, SI, DI |
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75 | ;-------------------------------------------------------------------- |
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76 | .DetectDrives_WithIDEVARS: |
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77 | push cx |
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78 | |
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79 | push si |
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80 | mov ax, g_szMaster |
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81 | mov bh, MASK_DRVNHEAD_SET ; Select Master drive |
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82 | call StartDetectionWithDriveSelectByteInBHandStringInAX ; Detect and create DPT + BOOTNFO |
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83 | pop si |
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84 | |
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85 | mov ax, g_szSlave |
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86 | mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV |
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87 | call StartDetectionWithDriveSelectByteInBHandStringInAX |
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88 | pop cx |
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89 | |
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90 | .done: |
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91 | ret |
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92 | |
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93 | |
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94 | ;-------------------------------------------------------------------- |
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95 | ; StartDetectionWithDriveSelectByteInBHandStringInAX |
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96 | ; Parameters: |
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97 | ; AX: Offset to "Master" or "Slave" string |
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98 | ; BH: Drive Select byte for Drive and Head Register |
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99 | ; CS:BP: Ptr to IDEVARS for the drive |
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100 | ; DS: RAMVARS segment |
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101 | ; ES: Zero (BDA segment) |
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102 | ; Returns: |
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103 | ; None |
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104 | ; Corrupts registers: |
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105 | ; AX, BX, CX, DX, SI, DI |
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106 | ;-------------------------------------------------------------------- |
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107 | StartDetectionWithDriveSelectByteInBHandStringInAX: |
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108 | call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP |
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109 | ; Fall to .ReadAtaInfoFromHardDisk |
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110 | |
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111 | ;-------------------------------------------------------------------- |
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112 | ; .ReadAtaInfoFromHardDisk |
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113 | ; Parameters: |
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114 | ; BH: Drive Select byte for Drive and Head Register |
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115 | ; CS:BP: Ptr to IDEVARS for the drive |
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116 | ; DS: RAMVARS segment |
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117 | ; ES: Zero (BDA segment) |
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118 | ; Returns: |
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119 | ; CF: Cleared if ATA-information read successfully |
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120 | ; Set if any error |
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121 | ; Corrupts registers: |
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122 | ; AX, BL, CX, DX, SI, DI |
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123 | ;-------------------------------------------------------------------- |
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124 | .ReadAtaInfoFromHardDisk: |
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125 | mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location |
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126 | push es |
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127 | push si |
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128 | push bx |
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129 | call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH |
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130 | pop bx |
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131 | pop si |
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132 | pop es |
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133 | jnc SHORT CreateBiosTablesForHardDisk |
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134 | ; Fall to .ReadAtapiInfoFromDrive |
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135 | |
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136 | .ReadAtapiInfoFromDrive: ; Not yet implemented |
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137 | ;call ReadAtapiInfoFromDrive ; Assume CD-ROM |
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138 | ;jnc SHORT _CreateBiosTablesForCDROM |
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139 | |
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140 | ;jmp short DetectDrives_DriveNotFound |
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141 | ;;; fall-through instead of previous jmp instruction |
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142 | ;-------------------------------------------------------------------- |
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143 | ; DetectDrives_DriveNotFound |
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144 | ; Parameters: |
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145 | ; Nothing |
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146 | ; Returns: |
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147 | ; CF: Set (from BootMenuPrint_NullTerminatedStringFromCSSIandSetCF) |
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148 | ; Corrupts registers: |
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149 | ; AX, SI |
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150 | ;-------------------------------------------------------------------- |
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151 | DetectDrives_DriveNotFound: |
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152 | mov si, g_szNotFound |
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153 | jmp BootMenuPrint_NullTerminatedStringFromCSSIandSetCF |
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154 | |
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155 | |
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156 | ;-------------------------------------------------------------------- |
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157 | ; CreateBiosTablesForHardDisk |
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158 | ; Parameters: |
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159 | ; BH: Drive Select byte for Drive and Head Register |
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160 | ; CS:BP: Ptr to IDEVARS for the drive |
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161 | ; ES:SI Ptr to ATA information for the drive |
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162 | ; DS: RAMVARS segment |
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163 | ; ES: BDA/Bootnfo segment |
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164 | ; Returns: |
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165 | ; Nothing |
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166 | ; Corrupts registers: |
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167 | ; AX, BX, CX, DX, SI, DI |
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168 | ;-------------------------------------------------------------------- |
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169 | CreateBiosTablesForHardDisk: |
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170 | call CreateDPT_FromAtaInformation |
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171 | jc SHORT DetectDrives_DriveNotFound |
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172 | call BootInfo_CreateForHardDisk |
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173 | jmp short DetectPrint_DriveNameFromBootnfoInESBX |
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174 | |
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175 | |
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