| [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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| 22 | .DriveDetectLoop:
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| [175] | 23 | call .DetectDrives_WithIDEVARS ; Detect Master and Slave
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| [3] | 24 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS
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| 25 | loop .DriveDetectLoop
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| [175] | 26 |
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| 27 | %ifdef MODULE_SERIAL
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| [179] | 28 | test BYTE [es:BDA.bKBFlgs1], 8 ; alt key depressed
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| 29 | jz .done
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| 30 | mov bp, ROMVARS.ideVarsSerialAuto
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| [175] | 31 | ;;; fall-through
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| 32 | %else
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| [3] | 33 | ret
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| [175] | 34 | %endif
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| [3] | 35 |
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| 36 | ;--------------------------------------------------------------------
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| 37 | ; Detects IDE hard disks by using information from IDEVARS.
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| 38 | ;
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| 39 | ; DetectDrives_WithIDEVARS
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| 40 | ; Parameters:
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| 41 | ; CS:BP: Ptr to IDEVARS
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| 42 | ; DS: RAMVARS segment
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| 43 | ; ES: Zero (BDA segment)
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| 44 | ; Returns:
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| 45 | ; Nothing
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| 46 | ; Corrupts registers:
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| 47 | ; AX, BX, DX, SI, DI
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| 48 | ;--------------------------------------------------------------------
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| [175] | 49 | .DetectDrives_WithIDEVARS:
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| [3] | 50 | push cx
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| [97] | 51 | mov ax, g_szMaster
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| [150] | 52 | mov bh, MASK_DRVNHEAD_SET ; Select Master drive
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| [98] | 53 | call StartDetectionWithDriveSelectByteInBHandStringInAX ; Detect and create DPT + BOOTNFO
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| [3] | 54 |
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| [97] | 55 | mov ax, g_szSlave
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| [150] | 56 | mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV
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| [98] | 57 | call StartDetectionWithDriveSelectByteInBHandStringInAX
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| [3] | 58 | pop cx
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| [175] | 59 | .done:
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| [3] | 60 | ret
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| 61 |
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| [175] | 62 |
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| [3] | 63 | ;--------------------------------------------------------------------
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| [98] | 64 | ; StartDetectionWithDriveSelectByteInBHandStringInAX
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| [3] | 65 | ; Parameters:
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| [98] | 66 | ; AX: Offset to "Master" or "Slave" string
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| [3] | 67 | ; BH: Drive Select byte for Drive and Head Register
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| 68 | ; CS:BP: Ptr to IDEVARS for the drive
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| 69 | ; DS: RAMVARS segment
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| 70 | ; ES: Zero (BDA segment)
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| 71 | ; Returns:
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| [98] | 72 | ; Nothing
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| [3] | 73 | ; Corrupts registers:
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| [98] | 74 | ; AX, BX, CX, DX, SI, DI
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| [3] | 75 | ;--------------------------------------------------------------------
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| [98] | 76 | StartDetectionWithDriveSelectByteInBHandStringInAX:
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| 77 | call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP
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| [120] | 78 | ; Fall to .ReadAtaInfoFromHardDisk
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| [3] | 79 |
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| 80 | ;--------------------------------------------------------------------
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| [120] | 81 | ; .ReadAtaInfoFromHardDisk
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| [3] | 82 | ; Parameters:
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| 83 | ; BH: Drive Select byte for Drive and Head Register
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| 84 | ; CS:BP: Ptr to IDEVARS for the drive
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| 85 | ; DS: RAMVARS segment
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| 86 | ; ES: Zero (BDA segment)
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| 87 | ; Returns:
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| 88 | ; CF: Cleared if ATA-information read successfully
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| 89 | ; Set if any error
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| 90 | ; Corrupts registers:
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| [150] | 91 | ; AX, BL, CX, DX, SI, DI
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| [3] | 92 | ;--------------------------------------------------------------------
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| [120] | 93 | .ReadAtaInfoFromHardDisk:
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| [150] | 94 | mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location
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| 95 | push es
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| 96 | push si
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| 97 | push bx
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| 98 | call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH
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| 99 | pop bx
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| 100 | pop si
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| 101 | pop es
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| [120] | 102 | jnc SHORT CreateBiosTablesForHardDisk
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| 103 | ; Fall to .ReadAtapiInfoFromDrive
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| [3] | 104 |
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| [120] | 105 | .ReadAtapiInfoFromDrive: ; Not yet implemented
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| 106 | ;call ReadAtapiInfoFromDrive ; Assume CD-ROM
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| 107 | ;jnc SHORT _CreateBiosTablesForCDROM
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| 108 | jmp DetectPrint_DriveNotFound
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| [3] | 109 |
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| [120] | 110 |
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| [3] | 111 | ;--------------------------------------------------------------------
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| [98] | 112 | ; CreateBiosTablesForHardDisk
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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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| [150] | 116 | ; ES:SI Ptr to ATA information for the drive
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| [3] | 117 | ; DS: RAMVARS segment
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| [98] | 118 | ; ES: BDA/Bootnfo segment
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| [3] | 119 | ; Returns:
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| [98] | 120 | ; Nothing
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| [3] | 121 | ; Corrupts registers:
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| [98] | 122 | ; AX, BX, CX, DX, SI, DI
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| [3] | 123 | ;--------------------------------------------------------------------
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| [98] | 124 | CreateBiosTablesForHardDisk:
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| [3] | 125 | call CreateDPT_FromAtaInformation
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| 126 | jc SHORT .InvalidAtaInfo
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| 127 | call BootInfo_CreateForHardDisk
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| [98] | 128 | jmp DetectPrint_DriveNameFromBootnfoInESBX
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| [3] | 129 | .InvalidAtaInfo:
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| [98] | 130 | jmp DetectPrint_DriveNotFound
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