| [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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| 28 | test BYTE [es:BDA.bKBFlgs1], (1<<2) |
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| 29 | ;; jz .done |
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| 30 | mov bp, ROMVARS.ideVarsAutoSerial |
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| 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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