| 1 | ; Project name : IDE 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 | .DriveDetectLoop:
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| 23 | call DetectDrives_WithIDEVARS ; Detect Master and Slave
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| 24 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS
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| 25 | loop .DriveDetectLoop
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| 26 | ret
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| 27 |
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| 28 |
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| 29 | ;--------------------------------------------------------------------
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| 30 | ; Detects IDE hard disks by using information from IDEVARS.
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| 31 | ;
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| 32 | ; DetectDrives_WithIDEVARS
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| 33 | ; Parameters:
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| 34 | ; CS:BP: Ptr to IDEVARS
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| 35 | ; DS: RAMVARS segment
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| 36 | ; ES: Zero (BDA segment)
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| 37 | ; Returns:
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| 38 | ; Nothing
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| 39 | ; Corrupts registers:
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| 40 | ; AX, BX, DX, SI, DI
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| 41 | ;--------------------------------------------------------------------
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| 42 | DetectDrives_WithIDEVARS:
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| 43 | push cx
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| 44 | mov ax, g_szMaster
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| 45 | mov bh, MASK_IDE_DRVHD_SET ; Select Master drive
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| 46 | call StartDetectionWithDriveSelectByteInBHandStringInAX ; Detect and create DPT + BOOTNFO
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| 47 |
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| 48 | mov ax, g_szSlave
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| 49 | mov bh, MASK_IDE_DRVHD_SET | FLG_IDE_DRVHD_DRV
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| 50 | call StartDetectionWithDriveSelectByteInBHandStringInAX
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| 51 | pop cx
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| 52 | ret
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| 53 |
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| 54 |
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| 55 | ;--------------------------------------------------------------------
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| 56 | ; StartDetectionWithDriveSelectByteInBHandStringInAX
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| 57 | ; Parameters:
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| 58 | ; AX: Offset to "Master" or "Slave" string
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| 59 | ; BH: Drive Select byte for Drive and Head Register
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| 60 | ; CS:BP: Ptr to IDEVARS for the drive
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| 61 | ; DS: RAMVARS segment
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| 62 | ; ES: Zero (BDA segment)
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| 63 | ; Returns:
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| 64 | ; Nothing
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| 65 | ; Corrupts registers:
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| 66 | ; AX, BX, CX, DX, SI, DI
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| 67 | ;--------------------------------------------------------------------
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| 68 | StartDetectionWithDriveSelectByteInBHandStringInAX:
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| 69 | call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP
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| 70 | call ReadAtaInfoFromDrive ; Assume hard disk
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| 71 | jnc SHORT CreateBiosTablesForHardDisk
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| 72 | ;call ReadAtapiInfoFromDrive ; Assume CD-ROM (not yet implemented)
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| 73 | ;jnc SHORT _CreateBiosTablesForCDROM
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| 74 | jmp DetectPrint_DriveNotFound
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| 75 |
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| 76 |
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| 77 | ;--------------------------------------------------------------------
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| 78 | ; ReadAtaInfoFromDrive
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| 79 | ; Parameters:
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| 80 | ; BH: Drive Select byte for Drive and Head Register
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| 81 | ; CS:BP: Ptr to IDEVARS for the drive
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| 82 | ; DS: RAMVARS segment
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| 83 | ; ES: Zero (BDA segment)
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| 84 | ; Returns:
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| 85 | ; ES:SI Ptr to ATA information (read with IDENTIFY DEVICE command)
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| 86 | ; CF: Cleared if ATA-information read successfully
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| 87 | ; Set if any error
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| 88 | ; Corrupts registers:
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| 89 | ; AX, BL, CX, DX, DI
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| 90 | ;--------------------------------------------------------------------
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| 91 | ReadAtaInfoFromDrive:
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| 92 | mov bl, [cs:bp+IDEVARS.bBusType]; Load BUS type
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| 93 | mov dx, [cs:bp+IDEVARS.wPort] ; Load IDE Base Port address
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| 94 | mov di, BOOTVARS.rgbAtaInfo ; ES:DI now points to ATA info location
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| 95 | call AH25h_GetDriveInfo
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| 96 | mov si, di ; ES:SI now points to ATA information
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| 97 | ret
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| 98 |
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| 99 |
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| 100 | ;--------------------------------------------------------------------
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| 101 | ; CreateBiosTablesForHardDisk
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| 102 | ; Parameters:
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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 | ; ES:SI Ptr to ATA information for the drive
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| 106 | ; DS: RAMVARS segment
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| 107 | ; ES: BDA/Bootnfo segment
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| 108 | ; Returns:
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| 109 | ; Nothing
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| 110 | ; Corrupts registers:
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| 111 | ; AX, BX, CX, DX, SI, DI
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| 112 | ;--------------------------------------------------------------------
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| 113 | CreateBiosTablesForHardDisk:
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| 114 | call CreateDPT_FromAtaInformation
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| 115 | jc SHORT .InvalidAtaInfo
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| 116 | call BootInfo_CreateForHardDisk
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| 117 | jmp DetectPrint_DriveNameFromBootnfoInESBX
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| 118 | .InvalidAtaInfo:
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| 119 | jmp DetectPrint_DriveNotFound
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