[150] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 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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[33] | 20 | call RamVars_GetIdeControllerCountToCX |
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[3] | 21 | mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS |
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[200] | 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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[196] | 25 | %ifdef MODULE_SERIAL |
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| 26 | cmp byte [cs:bp+IDEVARS.bDevice], DEVICE_SERIAL_PORT |
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[200] | 27 | jnz .DriveNotSerial ; Special print string for serial drives |
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[196] | 28 | mov si, g_szDetectCOM |
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| 29 | .DriveNotSerial: |
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| 30 | %endif |
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[175] | 31 | call .DetectDrives_WithIDEVARS ; Detect Master and Slave |
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[3] | 32 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS |
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| 33 | loop .DriveDetectLoop |
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[200] | 34 | |
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[175] | 35 | %ifdef MODULE_SERIAL |
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[200] | 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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[199] | 44 | ;;; fall-through |
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[175] | 45 | %else |
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[3] | 46 | ret |
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[175] | 47 | %endif |
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[3] | 48 | |
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[199] | 49 | %if FLG_ROMVARS_SERIAL_SCANDETECT != 8 |
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[200] | 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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[199] | 51 | %endif |
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| 52 | |
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[3] | 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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[189] | 61 | ; SI: Ptr to template string |
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[3] | 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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[175] | 67 | .DetectDrives_WithIDEVARS: |
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[3] | 68 | push cx |
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[196] | 69 | |
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| 70 | push si |
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[97] | 71 | mov ax, g_szMaster |
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[150] | 72 | mov bh, MASK_DRVNHEAD_SET ; Select Master drive |
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[98] | 73 | call StartDetectionWithDriveSelectByteInBHandStringInAX ; Detect and create DPT + BOOTNFO |
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[189] | 74 | pop si |
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[196] | 75 | |
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[200] | 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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[97] | 90 | mov ax, g_szSlave |
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[150] | 91 | mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV |
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[98] | 92 | call StartDetectionWithDriveSelectByteInBHandStringInAX |
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[3] | 93 | pop cx |
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[200] | 94 | |
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[175] | 95 | .done: |
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[3] | 96 | ret |
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| 97 | |
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[175] | 98 | |
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[3] | 99 | ;-------------------------------------------------------------------- |
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[98] | 100 | ; StartDetectionWithDriveSelectByteInBHandStringInAX |
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[3] | 101 | ; Parameters: |
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[98] | 102 | ; AX: Offset to "Master" or "Slave" string |
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[3] | 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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[200] | 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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[3] | 111 | ; Corrupts registers: |
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[98] | 112 | ; AX, BX, CX, DX, SI, DI |
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[3] | 113 | ;-------------------------------------------------------------------- |
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[98] | 114 | StartDetectionWithDriveSelectByteInBHandStringInAX: |
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| 115 | call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP |
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[120] | 116 | ; Fall to .ReadAtaInfoFromHardDisk |
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[3] | 117 | |
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| 118 | ;-------------------------------------------------------------------- |
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[120] | 119 | ; .ReadAtaInfoFromHardDisk |
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[3] | 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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[150] | 129 | ; AX, BL, CX, DX, SI, DI |
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[3] | 130 | ;-------------------------------------------------------------------- |
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[120] | 131 | .ReadAtaInfoFromHardDisk: |
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[150] | 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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[120] | 140 | jnc SHORT CreateBiosTablesForHardDisk |
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| 141 | ; Fall to .ReadAtapiInfoFromDrive |
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[3] | 142 | |
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[120] | 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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[196] | 146 | jmp short DetectDrives_DriveNotFound |
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[3] | 147 | |
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[120] | 148 | |
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[3] | 149 | ;-------------------------------------------------------------------- |
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[98] | 150 | ; CreateBiosTablesForHardDisk |
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[3] | 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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[150] | 154 | ; ES:SI Ptr to ATA information for the drive |
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[3] | 155 | ; DS: RAMVARS segment |
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[98] | 156 | ; ES: BDA/Bootnfo segment |
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[3] | 157 | ; Returns: |
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[98] | 158 | ; Nothing |
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[3] | 159 | ; Corrupts registers: |
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[98] | 160 | ; AX, BX, CX, DX, SI, DI |
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[3] | 161 | ;-------------------------------------------------------------------- |
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[98] | 162 | CreateBiosTablesForHardDisk: |
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[3] | 163 | call CreateDPT_FromAtaInformation |
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[196] | 164 | jc SHORT DetectDrives_DriveNotFound |
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[3] | 165 | call BootInfo_CreateForHardDisk |
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[196] | 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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[200] | 173 | ; CF: Set (from BootMenuPrint_NullTerminatedStringFromCSSIandSetCF) |
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[196] | 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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