| [3] | 1 | ; Project name : IDE BIOS
|
|---|
| 2 | ; Description : Functions for detecting drive for the BIOS.
|
|---|
| 3 |
|
|---|
| 4 | ; Section containing code
|
|---|
| 5 | SECTION .text
|
|---|
| 6 |
|
|---|
| 7 | ;--------------------------------------------------------------------
|
|---|
| 8 | ; Detects all IDE hard disks to be controlled by this BIOS.
|
|---|
| 9 | ;
|
|---|
| 10 | ; DetectDrives_FromAllIDEControllers
|
|---|
| 11 | ; Parameters:
|
|---|
| 12 | ; DS: RAMVARS segment
|
|---|
| 13 | ; ES: BDA segment (zero)
|
|---|
| 14 | ; Returns:
|
|---|
| 15 | ; Nothing
|
|---|
| 16 | ; Corrupts registers:
|
|---|
| 17 | ; All (not segments)
|
|---|
| 18 | ;--------------------------------------------------------------------
|
|---|
| 19 | ALIGN JUMP_ALIGN
|
|---|
| 20 | DetectDrives_FromAllIDEControllers:
|
|---|
| [33] | 21 | call RamVars_GetIdeControllerCountToCX
|
|---|
| [3] | 22 | mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS
|
|---|
| 23 | ALIGN JUMP_ALIGN
|
|---|
| 24 | .DriveDetectLoop:
|
|---|
| 25 | call DetectDrives_WithIDEVARS ; Detect Master and Slave
|
|---|
| 26 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS
|
|---|
| 27 | loop .DriveDetectLoop
|
|---|
| 28 | ret
|
|---|
| 29 |
|
|---|
| 30 |
|
|---|
| 31 | ;--------------------------------------------------------------------
|
|---|
| 32 | ; Detects IDE hard disks by using information from IDEVARS.
|
|---|
| 33 | ;
|
|---|
| 34 | ; DetectDrives_WithIDEVARS
|
|---|
| 35 | ; Parameters:
|
|---|
| 36 | ; CS:BP: Ptr to IDEVARS
|
|---|
| 37 | ; DS: RAMVARS segment
|
|---|
| 38 | ; ES: Zero (BDA segment)
|
|---|
| 39 | ; Returns:
|
|---|
| 40 | ; Nothing
|
|---|
| 41 | ; Corrupts registers:
|
|---|
| 42 | ; AX, BX, DX, SI, DI
|
|---|
| 43 | ;--------------------------------------------------------------------
|
|---|
| 44 | ALIGN JUMP_ALIGN
|
|---|
| 45 | DetectDrives_WithIDEVARS:
|
|---|
| 46 | push cx
|
|---|
| 47 | call DetectPrint_StartingMasterDetect ; Print detection string
|
|---|
| 48 | call DetectDrives_DetectMasterDrive ; Detect and create DPT + BOOTNFO
|
|---|
| 49 | call DetectPrint_DriveNameOrNotFound ; Print found or not found string
|
|---|
| 50 |
|
|---|
| 51 | call DetectPrint_StartingSlaveDetect
|
|---|
| 52 | call DetectDrives_DetectSlaveDrive
|
|---|
| 53 | call DetectPrint_DriveNameOrNotFound
|
|---|
| 54 | pop cx
|
|---|
| 55 | ret
|
|---|
| 56 |
|
|---|
| 57 |
|
|---|
| 58 | ;--------------------------------------------------------------------
|
|---|
| 59 | ; Detects IDE Master or Slave drive.
|
|---|
| 60 | ;
|
|---|
| 61 | ; DetectDrives_DetectMasterDrive
|
|---|
| 62 | ; DetectDrives_DetectSlaveDrive
|
|---|
| 63 | ; Parameters:
|
|---|
| 64 | ; CS:BP: Ptr to IDEVARS
|
|---|
| 65 | ; DS: RAMVARS segment
|
|---|
| 66 | ; ES: Zero (BDA segment)
|
|---|
| 67 | ; Returns:
|
|---|
| 68 | ; ES:BX: Ptr to BOOTNFO (if successful)
|
|---|
| 69 | ; CF: Cleared if drive detected successfully
|
|---|
| 70 | ; Set if any drive not found or other error
|
|---|
| 71 | ; Corrupts registers:
|
|---|
| 72 | ; AX, CX, DX, SI, DI
|
|---|
| 73 | ;--------------------------------------------------------------------
|
|---|
| 74 | ALIGN JUMP_ALIGN
|
|---|
| 75 | DetectDrives_DetectMasterDrive:
|
|---|
| 76 | mov bh, MASK_IDE_DRVHD_SET ; Select Master drive
|
|---|
| [86] | 77 | SKIP2B ax ; mov ax, <next instruction>
|
|---|
| [3] | 78 | DetectDrives_DetectSlaveDrive:
|
|---|
| 79 | mov bh, MASK_IDE_DRVHD_SET | FLG_IDE_DRVHD_DRV
|
|---|
| 80 | ; Fall to DetectDrives_StartDetection
|
|---|
| 81 |
|
|---|
| 82 | ;--------------------------------------------------------------------
|
|---|
| 83 | ; Detects IDE Master or Slave drive.
|
|---|
| 84 | ;
|
|---|
| 85 | ; DetectDrives_StartDetection
|
|---|
| 86 | ; Parameters:
|
|---|
| 87 | ; BH: Drive Select byte for Drive and Head Register
|
|---|
| 88 | ; CS:BP: Ptr to IDEVARS for the drive
|
|---|
| 89 | ; DS: RAMVARS segment
|
|---|
| 90 | ; ES: Zero (BDA segment)
|
|---|
| 91 | ; Returns:
|
|---|
| 92 | ; ES:BX: Ptr to BOOTNFO (if successful)
|
|---|
| 93 | ; CF: Cleared if drive detected successfully
|
|---|
| 94 | ; Set if any drive not found or other error
|
|---|
| 95 | ; Corrupts registers:
|
|---|
| 96 | ; AX, CX, DX, SI, DI
|
|---|
| 97 | ;--------------------------------------------------------------------
|
|---|
| 98 | ALIGN JUMP_ALIGN
|
|---|
| 99 | DetectDrives_StartDetection:
|
|---|
| 100 | call DetectDrives_ReadAtaInfoFromDrive ; Assume hard disk
|
|---|
| 101 | jnc SHORT DetectDrives_CreateBiosTablesForHardDisk
|
|---|
| 102 | call DetectDrives_ReadAtapiInfoFromDrive ; Assume CD-ROM
|
|---|
| 103 | jnc SHORT DetectDrives_CreateBiosTablesForCDROM
|
|---|
| 104 | ret
|
|---|
| 105 |
|
|---|
| 106 |
|
|---|
| 107 | ;--------------------------------------------------------------------
|
|---|
| 108 | ; Reads ATA information from the drive (for hard disks).
|
|---|
| 109 | ;
|
|---|
| 110 | ; DetectDrives_ReadAtaInfoFromDrive
|
|---|
| 111 | ; Parameters:
|
|---|
| 112 | ; BH: Drive Select byte for Drive and Head Register
|
|---|
| 113 | ; CS:BP: Ptr to IDEVARS for the drive
|
|---|
| 114 | ; DS: RAMVARS segment
|
|---|
| 115 | ; ES: Zero (BDA segment)
|
|---|
| 116 | ; Returns:
|
|---|
| 117 | ; ES:SI Ptr to ATA information (read with IDENTIFY DEVICE command)
|
|---|
| 118 | ; CF: Cleared if ATA-information read successfully
|
|---|
| 119 | ; Set if any error
|
|---|
| 120 | ; Corrupts registers:
|
|---|
| 121 | ; AX, BL, CX, DX, DI
|
|---|
| 122 | ;--------------------------------------------------------------------
|
|---|
| 123 | ALIGN JUMP_ALIGN
|
|---|
| 124 | DetectDrives_ReadAtaInfoFromDrive:
|
|---|
| 125 | mov bl, [cs:bp+IDEVARS.bBusType]; Load BUS type
|
|---|
| 126 | mov dx, [cs:bp+IDEVARS.wPort] ; Load IDE Base Port address
|
|---|
| 127 | mov di, BOOTVARS.rgbAtaInfo ; ES:DI now points to ATA info location
|
|---|
| 128 | call AH25h_GetDriveInfo
|
|---|
| 129 | mov si, di ; ES:SI now points to ATA information
|
|---|
| 130 | ret
|
|---|
| 131 |
|
|---|
| 132 |
|
|---|
| 133 | ;--------------------------------------------------------------------
|
|---|
| 134 | ; Creates all BIOS tables for detected hard disk.
|
|---|
| 135 | ;
|
|---|
| 136 | ; DetectDrives_CreateBiosTablesForHardDisk
|
|---|
| 137 | ; Parameters:
|
|---|
| 138 | ; BH: Drive Select byte for Drive and Head Register
|
|---|
| 139 | ; CS:BP: Ptr to IDEVARS for the drive
|
|---|
| 140 | ; ES:SI Ptr to ATA information for the drive
|
|---|
| 141 | ; DS: RAMVARS segment
|
|---|
| 142 | ; Returns:
|
|---|
| 143 | ; ES:BX: Ptr to BOOTNFO (if successful)
|
|---|
| 144 | ; CF: Cleared if BIOS tables created succesfully
|
|---|
| 145 | ; Set if any error
|
|---|
| 146 | ; Corrupts registers:
|
|---|
| 147 | ; AX, CX, DX, SI, DI
|
|---|
| 148 | ;--------------------------------------------------------------------
|
|---|
| 149 | ALIGN JUMP_ALIGN
|
|---|
| 150 | DetectDrives_CreateBiosTablesForHardDisk:
|
|---|
| 151 | call CreateDPT_FromAtaInformation
|
|---|
| 152 | jc SHORT .InvalidAtaInfo
|
|---|
| 153 | call BootInfo_CreateForHardDisk
|
|---|
| 154 | ;jc SHORT .InvalidAtaInfo
|
|---|
| 155 | ; Call to search for BIOS partitions goes here
|
|---|
| 156 | ;clc
|
|---|
| 157 | .InvalidAtaInfo:
|
|---|
| 158 | ret
|
|---|
| 159 |
|
|---|
| 160 |
|
|---|
| 161 | ;--------------------------------------------------------------------
|
|---|
| [86] | 162 | ; Reads ATAPI information from the drive (for CD/DVD-ROMs).
|
|---|
| 163 | ;
|
|---|
| 164 | ; DetectDrives_ReadAtapiInfoFromDrive
|
|---|
| 165 | ; Parameters:
|
|---|
| 166 | ; BH: Drive Select byte for Drive and Head Register
|
|---|
| 167 | ; CS:BP: Ptr to IDEVARS for the drive
|
|---|
| 168 | ; DS: RAMVARS segment
|
|---|
| 169 | ; ES: Zero (BDA segment)
|
|---|
| 170 | ; Returns:
|
|---|
| 171 | ; ES:SI Ptr to ATAPI information (read with IDENTIFY PACKET DEVICE command)
|
|---|
| 172 | ; CF: Cleared if ATAPI-information read successfully
|
|---|
| 173 | ; Set if any error
|
|---|
| 174 | ; Corrupts registers:
|
|---|
| 175 | ; AX, BL, CX, DX, DI
|
|---|
| 176 | ;--------------------------------------------------------------------
|
|---|
| 177 | ALIGN JUMP_ALIGN
|
|---|
| 178 | DetectDrives_ReadAtapiInfoFromDrive:
|
|---|
| 179 | ;stc
|
|---|
| 180 | ;ret
|
|---|
| 181 | ; Fall through to DetectDrives_CreateBiosTablesForCDROM
|
|---|
| 182 |
|
|---|
| 183 |
|
|---|
| 184 | ;--------------------------------------------------------------------
|
|---|
| [3] | 185 | ; Creates all BIOS tables for detected CD/DVD-ROM.
|
|---|
| 186 | ;
|
|---|
| 187 | ; DetectDrives_CreateBiosTablesForCDROM
|
|---|
| 188 | ; Parameters:
|
|---|
| 189 | ; BH: Drive Select byte for Drive and Head Register
|
|---|
| 190 | ; CS:BP: Ptr to IDEVARS for the drive
|
|---|
| 191 | ; ES:SI Ptr to ATAPI information for the drive
|
|---|
| 192 | ; DS: RAMVARS segment
|
|---|
| 193 | ; Returns:
|
|---|
| 194 | ; ES:BX: Ptr to BOOTNFO (if successful)
|
|---|
| 195 | ; CF: Cleared if BIOS tables created succesfully
|
|---|
| 196 | ; Set if any error
|
|---|
| 197 | ; Corrupts registers:
|
|---|
| 198 | ; AX, CX, DX, SI, DI
|
|---|
| 199 | ;--------------------------------------------------------------------
|
|---|
| 200 | ALIGN JUMP_ALIGN
|
|---|
| 201 | DetectDrives_CreateBiosTablesForCDROM:
|
|---|
| 202 | stc
|
|---|
| 203 | ret
|
|---|
