| 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 | ALIGN JUMP_ALIGN
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| 20 | DetectDrives_FromAllIDEControllers:
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| 21 | call RamVars_GetIdeControllerCountToCX
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| 22 | mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS
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| 23 | ALIGN JUMP_ALIGN
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| 24 | .DriveDetectLoop:
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| 25 | call DetectDrives_WithIDEVARS ; Detect Master and Slave
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| 26 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS
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| 27 | loop .DriveDetectLoop
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| 28 | ret
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| 29 |
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| 30 |
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| 31 | ;--------------------------------------------------------------------
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| 32 | ; Detects IDE hard disks by using information from IDEVARS.
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| 33 | ;
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| 34 | ; DetectDrives_WithIDEVARS
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| 35 | ; Parameters:
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| 36 | ; CS:BP: Ptr to IDEVARS
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| 37 | ; DS: RAMVARS segment
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| 38 | ; ES: Zero (BDA segment)
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| 39 | ; Returns:
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| 40 | ; Nothing
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| 41 | ; Corrupts registers:
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| 42 | ; AX, BX, DX, SI, DI
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| 43 | ;--------------------------------------------------------------------
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| 44 | ALIGN JUMP_ALIGN
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| 45 | DetectDrives_WithIDEVARS:
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| 46 | push cx
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| 47 | call DetectPrint_StartingMasterDetect ; Print detection string
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| 48 | call DetectDrives_DetectMasterDrive ; Detect and create DPT + BOOTNFO
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| 49 | call DetectPrint_DriveNameOrNotFound ; Print found or not found string
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| 50 |
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| 51 | call DetectPrint_StartingSlaveDetect
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| 52 | call DetectDrives_DetectSlaveDrive
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| 53 | call DetectPrint_DriveNameOrNotFound
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| 54 | pop cx
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| 55 | ret
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| 56 |
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| 57 |
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| 58 | ;--------------------------------------------------------------------
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| 59 | ; Detects IDE Master or Slave drive.
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| 60 | ;
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| 61 | ; DetectDrives_DetectMasterDrive
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| 62 | ; DetectDrives_DetectSlaveDrive
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| 63 | ; Parameters:
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| 64 | ; CS:BP: Ptr to IDEVARS
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| 65 | ; DS: RAMVARS segment
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| 66 | ; ES: Zero (BDA segment)
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| 67 | ; Returns:
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| 68 | ; ES:BX: Ptr to BOOTNFO (if successful)
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| 69 | ; CF: Cleared if drive detected successfully
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| 70 | ; Set if any drive not found or other error
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| 71 | ; Corrupts registers:
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| 72 | ; AX, CX, DX, SI, DI
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| 73 | ;--------------------------------------------------------------------
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| 74 | ALIGN JUMP_ALIGN
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| 75 | DetectDrives_DetectMasterDrive:
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| 76 | mov bh, MASK_IDE_DRVHD_SET ; Select Master drive
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| 77 | SKIP2B ax ; mov ax, <next instruction>
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| 78 | DetectDrives_DetectSlaveDrive:
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| 79 | mov bh, MASK_IDE_DRVHD_SET | FLG_IDE_DRVHD_DRV
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| 80 | ; Fall to DetectDrives_StartDetection
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| 81 |
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| 82 | ;--------------------------------------------------------------------
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| 83 | ; Detects IDE Master or Slave drive.
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| 84 | ;
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| 85 | ; DetectDrives_StartDetection
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| 86 | ; Parameters:
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| 87 | ; BH: Drive Select byte for Drive and Head Register
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| 88 | ; CS:BP: Ptr to IDEVARS for the drive
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| 89 | ; DS: RAMVARS segment
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| 90 | ; ES: Zero (BDA segment)
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| 91 | ; Returns:
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| 92 | ; ES:BX: Ptr to BOOTNFO (if successful)
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| 93 | ; CF: Cleared if drive detected successfully
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| 94 | ; Set if any drive not found or other error
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| 95 | ; Corrupts registers:
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| 96 | ; AX, CX, DX, SI, DI
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| 97 | ;--------------------------------------------------------------------
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| 98 | ALIGN JUMP_ALIGN
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| 99 | DetectDrives_StartDetection:
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| 100 | call DetectDrives_ReadAtaInfoFromDrive ; Assume hard disk
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| 101 | jnc SHORT DetectDrives_CreateBiosTablesForHardDisk
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| 102 | call DetectDrives_ReadAtapiInfoFromDrive ; Assume CD-ROM
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| 103 | jnc SHORT DetectDrives_CreateBiosTablesForCDROM
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| 104 | ret
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| 105 |
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| 106 |
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| 107 | ;--------------------------------------------------------------------
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| 108 | ; Reads ATA information from the drive (for hard disks).
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| 109 | ;
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| 110 | ; DetectDrives_ReadAtaInfoFromDrive
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| 111 | ; Parameters:
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| 112 | ; BH: Drive Select byte for Drive and Head Register
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| 113 | ; CS:BP: Ptr to IDEVARS for the drive
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| 114 | ; DS: RAMVARS segment
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| 115 | ; ES: Zero (BDA segment)
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| 116 | ; Returns:
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| 117 | ; ES:SI Ptr to ATA information (read with IDENTIFY DEVICE command)
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| 118 | ; CF: Cleared if ATA-information read successfully
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| 119 | ; Set if any error
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| 120 | ; Corrupts registers:
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| 121 | ; AX, BL, CX, DX, DI
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| 122 | ;--------------------------------------------------------------------
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| 123 | ALIGN JUMP_ALIGN
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| 124 | DetectDrives_ReadAtaInfoFromDrive:
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| 125 | mov bl, [cs:bp+IDEVARS.bBusType]; Load BUS type
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| 126 | mov dx, [cs:bp+IDEVARS.wPort] ; Load IDE Base Port address
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| 127 | mov di, BOOTVARS.rgbAtaInfo ; ES:DI now points to ATA info location
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| 128 | call AH25h_GetDriveInfo
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| 129 | mov si, di ; ES:SI now points to ATA information
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| 130 | ret
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| 131 |
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| 132 |
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| 133 | ;--------------------------------------------------------------------
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| 134 | ; Creates all BIOS tables for detected hard disk.
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| 135 | ;
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| 136 | ; DetectDrives_CreateBiosTablesForHardDisk
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| 137 | ; Parameters:
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| 138 | ; BH: Drive Select byte for Drive and Head Register
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| 139 | ; CS:BP: Ptr to IDEVARS for the drive
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| 140 | ; ES:SI Ptr to ATA information for the drive
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| 141 | ; DS: RAMVARS segment
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| 142 | ; Returns:
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| 143 | ; ES:BX: Ptr to BOOTNFO (if successful)
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| 144 | ; CF: Cleared if BIOS tables created succesfully
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| 145 | ; Set if any error
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| 146 | ; Corrupts registers:
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| 147 | ; AX, CX, DX, SI, DI
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| 148 | ;--------------------------------------------------------------------
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| 149 | ALIGN JUMP_ALIGN
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| 150 | DetectDrives_CreateBiosTablesForHardDisk:
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| 151 | call CreateDPT_FromAtaInformation
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| 152 | jc SHORT .InvalidAtaInfo
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| 153 | call BootInfo_CreateForHardDisk
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| 154 | ;jc SHORT .InvalidAtaInfo
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| 155 | ; Call to search for BIOS partitions goes here
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| 156 | ;clc
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| 157 | .InvalidAtaInfo:
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| 158 | ret
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| 159 |
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| 160 |
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| 161 | ;--------------------------------------------------------------------
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| 162 | ; Reads ATAPI information from the drive (for CD/DVD-ROMs).
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| 163 | ;
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| 164 | ; DetectDrives_ReadAtapiInfoFromDrive
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| 165 | ; Parameters:
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| 166 | ; BH: Drive Select byte for Drive and Head Register
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| 167 | ; CS:BP: Ptr to IDEVARS for the drive
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| 168 | ; DS: RAMVARS segment
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| 169 | ; ES: Zero (BDA segment)
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| 170 | ; Returns:
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| 171 | ; ES:SI Ptr to ATAPI information (read with IDENTIFY PACKET DEVICE command)
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| 172 | ; CF: Cleared if ATAPI-information read successfully
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| 173 | ; Set if any error
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| 174 | ; Corrupts registers:
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| 175 | ; AX, BL, CX, DX, DI
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| 176 | ;--------------------------------------------------------------------
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| 177 | ALIGN JUMP_ALIGN
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| 178 | DetectDrives_ReadAtapiInfoFromDrive:
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| 179 | ;stc
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| 180 | ;ret
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| 181 | ; Fall through to DetectDrives_CreateBiosTablesForCDROM
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| 182 |
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| 183 |
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| 184 | ;--------------------------------------------------------------------
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| 185 | ; Creates all BIOS tables for detected CD/DVD-ROM.
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| 186 | ;
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| 187 | ; DetectDrives_CreateBiosTablesForCDROM
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| 188 | ; Parameters:
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| 189 | ; BH: Drive Select byte for Drive and Head Register
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| 190 | ; CS:BP: Ptr to IDEVARS for the drive
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| 191 | ; ES:SI Ptr to ATAPI information for the drive
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| 192 | ; DS: RAMVARS segment
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| 193 | ; Returns:
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| 194 | ; ES:BX: Ptr to BOOTNFO (if successful)
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| 195 | ; CF: Cleared if BIOS tables created succesfully
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| 196 | ; Set if any error
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| 197 | ; Corrupts registers:
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| 198 | ; AX, CX, DX, SI, DI
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| 199 | ;--------------------------------------------------------------------
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| 200 | ALIGN JUMP_ALIGN
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| 201 | DetectDrives_CreateBiosTablesForCDROM:
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| 202 | stc
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| 203 | ret
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