[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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[203] | 25 | %ifdef MODULE_SERIAL |
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[196] | 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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[203] | 31 | |
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[175] | 32 | call .DetectDrives_WithIDEVARS ; Detect Master and Slave |
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[3] | 33 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS |
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| 34 | loop .DriveDetectLoop |
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[203] | 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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[200] | 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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[203] | 50 | |
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[200] | 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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[199] | 53 | ;;; fall-through |
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[175] | 54 | %else |
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[3] | 55 | ret |
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[175] | 56 | %endif |
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[3] | 57 | |
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[199] | 58 | %if FLG_ROMVARS_SERIAL_SCANDETECT != 8 |
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[200] | 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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[199] | 60 | %endif |
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| 61 | |
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[3] | 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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[189] | 70 | ; SI: Ptr to template string |
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[3] | 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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[175] | 76 | .DetectDrives_WithIDEVARS: |
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[3] | 77 | push cx |
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[196] | 78 | |
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| 79 | push si |
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[97] | 80 | mov ax, g_szMaster |
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[150] | 81 | mov bh, MASK_DRVNHEAD_SET ; Select Master drive |
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[98] | 82 | call StartDetectionWithDriveSelectByteInBHandStringInAX ; Detect and create DPT + BOOTNFO |
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[189] | 83 | pop si |
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[196] | 84 | |
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[97] | 85 | mov ax, g_szSlave |
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[150] | 86 | mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV |
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[98] | 87 | call StartDetectionWithDriveSelectByteInBHandStringInAX |
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[3] | 88 | pop cx |
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[200] | 89 | |
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[175] | 90 | .done: |
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[3] | 91 | ret |
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| 92 | |
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[175] | 93 | |
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[3] | 94 | ;-------------------------------------------------------------------- |
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[98] | 95 | ; StartDetectionWithDriveSelectByteInBHandStringInAX |
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[3] | 96 | ; Parameters: |
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[98] | 97 | ; AX: Offset to "Master" or "Slave" string |
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[3] | 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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[203] | 103 | ; None |
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[3] | 104 | ; Corrupts registers: |
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[98] | 105 | ; AX, BX, CX, DX, SI, DI |
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[3] | 106 | ;-------------------------------------------------------------------- |
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[98] | 107 | StartDetectionWithDriveSelectByteInBHandStringInAX: |
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| 108 | call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP |
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[120] | 109 | ; Fall to .ReadAtaInfoFromHardDisk |
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[3] | 110 | |
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| 111 | ;-------------------------------------------------------------------- |
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[120] | 112 | ; .ReadAtaInfoFromHardDisk |
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[3] | 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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[150] | 122 | ; AX, BL, CX, DX, SI, DI |
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[3] | 123 | ;-------------------------------------------------------------------- |
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[120] | 124 | .ReadAtaInfoFromHardDisk: |
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[150] | 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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[120] | 133 | jnc SHORT CreateBiosTablesForHardDisk |
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| 134 | ; Fall to .ReadAtapiInfoFromDrive |
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[3] | 135 | |
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[120] | 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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[203] | 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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[3] | 154 | |
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[120] | 155 | |
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[3] | 156 | ;-------------------------------------------------------------------- |
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[98] | 157 | ; CreateBiosTablesForHardDisk |
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[3] | 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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[150] | 161 | ; ES:SI Ptr to ATA information for the drive |
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[3] | 162 | ; DS: RAMVARS segment |
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[98] | 163 | ; ES: BDA/Bootnfo segment |
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[3] | 164 | ; Returns: |
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[98] | 165 | ; Nothing |
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[3] | 166 | ; Corrupts registers: |
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[98] | 167 | ; AX, BX, CX, DX, SI, DI |
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[3] | 168 | ;-------------------------------------------------------------------- |
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[98] | 169 | CreateBiosTablesForHardDisk: |
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[3] | 170 | call CreateDPT_FromAtaInformation |
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[196] | 171 | jc SHORT DetectDrives_DriveNotFound |
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[3] | 172 | call BootInfo_CreateForHardDisk |
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[196] | 173 | jmp short DetectPrint_DriveNameFromBootnfoInESBX |
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| 174 | |
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| 175 | |
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