[3] | 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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[33] | 21 | call RamVars_GetIdeControllerCountToCX |
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[3] | 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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[97] | 47 | mov ax, g_szMaster |
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| 48 | call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP |
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[3] | 49 | call DetectDrives_DetectMasterDrive ; Detect and create DPT + BOOTNFO |
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| 50 | call DetectPrint_DriveNameOrNotFound ; Print found or not found string |
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| 51 | |
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[97] | 52 | mov ax, g_szSlave |
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| 53 | call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP |
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[3] | 54 | call DetectDrives_DetectSlaveDrive |
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| 55 | call DetectPrint_DriveNameOrNotFound |
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| 56 | pop cx |
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| 57 | ret |
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| 58 | |
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| 59 | |
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| 60 | ;-------------------------------------------------------------------- |
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| 61 | ; Detects IDE Master or Slave drive. |
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| 62 | ; |
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| 63 | ; DetectDrives_DetectMasterDrive |
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| 64 | ; DetectDrives_DetectSlaveDrive |
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| 65 | ; Parameters: |
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| 66 | ; CS:BP: Ptr to IDEVARS |
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| 67 | ; DS: RAMVARS segment |
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| 68 | ; ES: Zero (BDA segment) |
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| 69 | ; Returns: |
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| 70 | ; ES:BX: Ptr to BOOTNFO (if successful) |
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| 71 | ; CF: Cleared if drive detected successfully |
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| 72 | ; Set if any drive not found or other error |
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| 73 | ; Corrupts registers: |
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| 74 | ; AX, CX, DX, SI, DI |
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| 75 | ;-------------------------------------------------------------------- |
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| 76 | ALIGN JUMP_ALIGN |
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| 77 | DetectDrives_DetectMasterDrive: |
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| 78 | mov bh, MASK_IDE_DRVHD_SET ; Select Master drive |
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[86] | 79 | SKIP2B ax ; mov ax, <next instruction> |
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[3] | 80 | DetectDrives_DetectSlaveDrive: |
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| 81 | mov bh, MASK_IDE_DRVHD_SET | FLG_IDE_DRVHD_DRV |
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| 82 | ; Fall to DetectDrives_StartDetection |
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| 83 | |
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| 84 | ;-------------------------------------------------------------------- |
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| 85 | ; Detects IDE Master or Slave drive. |
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| 86 | ; |
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| 87 | ; DetectDrives_StartDetection |
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| 88 | ; Parameters: |
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| 89 | ; BH: Drive Select byte for Drive and Head Register |
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| 90 | ; CS:BP: Ptr to IDEVARS for the drive |
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| 91 | ; DS: RAMVARS segment |
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| 92 | ; ES: Zero (BDA segment) |
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| 93 | ; Returns: |
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| 94 | ; ES:BX: Ptr to BOOTNFO (if successful) |
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| 95 | ; CF: Cleared if drive detected successfully |
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| 96 | ; Set if any drive not found or other error |
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| 97 | ; Corrupts registers: |
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| 98 | ; AX, CX, DX, SI, DI |
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| 99 | ;-------------------------------------------------------------------- |
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| 100 | ALIGN JUMP_ALIGN |
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| 101 | DetectDrives_StartDetection: |
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| 102 | call DetectDrives_ReadAtaInfoFromDrive ; Assume hard disk |
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| 103 | jnc SHORT DetectDrives_CreateBiosTablesForHardDisk |
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| 104 | call DetectDrives_ReadAtapiInfoFromDrive ; Assume CD-ROM |
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| 105 | jnc SHORT DetectDrives_CreateBiosTablesForCDROM |
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| 106 | ret |
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| 107 | |
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| 108 | |
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| 109 | ;-------------------------------------------------------------------- |
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| 110 | ; Reads ATA information from the drive (for hard disks). |
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| 111 | ; |
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| 112 | ; DetectDrives_ReadAtaInfoFromDrive |
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| 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 | ; ES:SI Ptr to ATA information (read with IDENTIFY DEVICE command) |
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| 120 | ; CF: Cleared if ATA-information read successfully |
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| 121 | ; Set if any error |
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| 122 | ; Corrupts registers: |
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| 123 | ; AX, BL, CX, DX, DI |
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| 124 | ;-------------------------------------------------------------------- |
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| 125 | ALIGN JUMP_ALIGN |
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| 126 | DetectDrives_ReadAtaInfoFromDrive: |
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| 127 | mov bl, [cs:bp+IDEVARS.bBusType]; Load BUS type |
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| 128 | mov dx, [cs:bp+IDEVARS.wPort] ; Load IDE Base Port address |
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| 129 | mov di, BOOTVARS.rgbAtaInfo ; ES:DI now points to ATA info location |
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| 130 | call AH25h_GetDriveInfo |
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| 131 | mov si, di ; ES:SI now points to ATA information |
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| 132 | ret |
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| 133 | |
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| 134 | |
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| 135 | ;-------------------------------------------------------------------- |
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| 136 | ; Creates all BIOS tables for detected hard disk. |
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| 137 | ; |
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| 138 | ; DetectDrives_CreateBiosTablesForHardDisk |
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| 139 | ; Parameters: |
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| 140 | ; BH: Drive Select byte for Drive and Head Register |
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| 141 | ; CS:BP: Ptr to IDEVARS for the drive |
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| 142 | ; ES:SI Ptr to ATA information for the drive |
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| 143 | ; DS: RAMVARS segment |
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| 144 | ; Returns: |
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| 145 | ; ES:BX: Ptr to BOOTNFO (if successful) |
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| 146 | ; CF: Cleared if BIOS tables created succesfully |
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| 147 | ; Set if any error |
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| 148 | ; Corrupts registers: |
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| 149 | ; AX, CX, DX, SI, DI |
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| 150 | ;-------------------------------------------------------------------- |
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| 151 | ALIGN JUMP_ALIGN |
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| 152 | DetectDrives_CreateBiosTablesForHardDisk: |
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| 153 | call CreateDPT_FromAtaInformation |
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| 154 | jc SHORT .InvalidAtaInfo |
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| 155 | call BootInfo_CreateForHardDisk |
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| 156 | ;jc SHORT .InvalidAtaInfo |
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| 157 | ; Call to search for BIOS partitions goes here |
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| 158 | ;clc |
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| 159 | .InvalidAtaInfo: |
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| 160 | ret |
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| 161 | |
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| 162 | |
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| 163 | ;-------------------------------------------------------------------- |
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[86] | 164 | ; Reads ATAPI information from the drive (for CD/DVD-ROMs). |
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| 165 | ; |
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| 166 | ; DetectDrives_ReadAtapiInfoFromDrive |
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| 167 | ; Parameters: |
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| 168 | ; BH: Drive Select byte for Drive and Head Register |
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| 169 | ; CS:BP: Ptr to IDEVARS for the drive |
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| 170 | ; DS: RAMVARS segment |
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| 171 | ; ES: Zero (BDA segment) |
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| 172 | ; Returns: |
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| 173 | ; ES:SI Ptr to ATAPI information (read with IDENTIFY PACKET DEVICE command) |
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| 174 | ; CF: Cleared if ATAPI-information read successfully |
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| 175 | ; Set if any error |
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| 176 | ; Corrupts registers: |
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| 177 | ; AX, BL, CX, DX, DI |
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| 178 | ;-------------------------------------------------------------------- |
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| 179 | ALIGN JUMP_ALIGN |
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| 180 | DetectDrives_ReadAtapiInfoFromDrive: |
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| 181 | ;stc |
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| 182 | ;ret |
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| 183 | ; Fall through to DetectDrives_CreateBiosTablesForCDROM |
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| 184 | |
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| 185 | |
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| 186 | ;-------------------------------------------------------------------- |
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[3] | 187 | ; Creates all BIOS tables for detected CD/DVD-ROM. |
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| 188 | ; |
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| 189 | ; DetectDrives_CreateBiosTablesForCDROM |
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| 190 | ; Parameters: |
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| 191 | ; BH: Drive Select byte for Drive and Head Register |
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| 192 | ; CS:BP: Ptr to IDEVARS for the drive |
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| 193 | ; ES:SI Ptr to ATAPI information for the drive |
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| 194 | ; DS: RAMVARS segment |
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| 195 | ; Returns: |
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| 196 | ; ES:BX: Ptr to BOOTNFO (if successful) |
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| 197 | ; CF: Cleared if BIOS tables created succesfully |
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| 198 | ; Set if any error |
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| 199 | ; Corrupts registers: |
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| 200 | ; AX, CX, DX, SI, DI |
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| 201 | ;-------------------------------------------------------------------- |
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| 202 | ALIGN JUMP_ALIGN |
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| 203 | DetectDrives_CreateBiosTablesForCDROM: |
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| 204 | stc |
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| 205 | ret |
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