[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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[200] | 22 | |
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| 23 | .DriveDetectLoop: ; Loop through IDEVARS |
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[233] | 24 | push cx |
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| 25 | |
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| 26 | mov cx, g_szDetectMaster |
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| 27 | mov bh, MASK_DRVNHEAD_SET ; Select Master drive |
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| 28 | call StartDetectionWithDriveSelectByteInBHandStringInAX ; Detect and create DPT + BOOTNFO |
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| 29 | |
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| 30 | mov cx, g_szDetectSlave |
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[242] | 31 | mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV |
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[233] | 32 | call StartDetectionWithDriveSelectByteInBHandStringInAX |
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[242] | 33 | |
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[233] | 34 | pop cx |
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| 35 | |
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| 36 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS |
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| 37 | |
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[242] | 38 | %ifdef MODULE_SERIAL |
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[262] | 39 | jcxz .AddHardDisks ; Set to zero on .ideVarsSerialAuto iteration (if any) |
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[196] | 40 | %endif |
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[242] | 41 | |
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[3] | 42 | loop .DriveDetectLoop |
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[203] | 43 | |
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[242] | 44 | %ifdef MODULE_SERIAL |
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[258] | 45 | ;---------------------------------------------------------------------- |
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[203] | 46 | ; |
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[233] | 47 | ; if serial drive detected, do not scan (avoids duplicate drives and isn't needed - we already have a connection) |
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[203] | 48 | ; |
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[233] | 49 | call FindDPT_ToDSDIforSerialDevice |
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[262] | 50 | jnc .AddHardDisks |
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[233] | 51 | |
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[242] | 52 | mov bp, ROMVARS.ideVarsSerialAuto ; Point to our special IDEVARS structure, just for serial scans |
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| 53 | |
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[200] | 54 | mov al,[cs:ROMVARS.wFlags] ; Configurator set to always scan? |
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| 55 | or al,[es:BDA.bKBFlgs1] ; Or, did the user hold down the ALT key? |
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| 56 | and al,8 ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_ALWAYSDETECT |
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[242] | 57 | jnz .DriveDetectLoop |
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[233] | 58 | %endif |
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[203] | 59 | |
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[262] | 60 | .AddHardDisks: |
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[258] | 61 | ;---------------------------------------------------------------------- |
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| 62 | ; |
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[262] | 63 | ; Add in hard disks to BDA, finalize our Count and First variables |
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[258] | 64 | ; |
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[269] | 65 | ; Note that we perform the add to bHDCount and store bFirstDrv even if the count is zero. |
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| 66 | ; This is done because we use the value of .bFirstDrv to know how many drives were in the system |
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| 67 | ; at the time of boot, and to return that number on int13h/8h calls. Because the count is zero, |
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| 68 | ; FindDPT_ForDriveNumber will not find any drives that are ours. |
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| 69 | ; |
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[262] | 70 | mov cx, [RAMVARS.wDrvCntAndFlopCnt] ; Our count of hard disks |
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[258] | 71 | |
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[262] | 72 | mov al, [es:BDA.bHDCount] |
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| 73 | add cl, al ; Add our drives to the system count |
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| 74 | mov [es:BDA.bHDCount], cl |
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| 75 | or al, 80h ; Or in hard disk flag |
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| 76 | mov [RAMVARS.bFirstDrv], al ; Store first drive number |
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| 77 | |
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| 78 | .AddFloppies: |
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[263] | 79 | %ifdef MODULE_SERIAL_FLOPPY |
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[262] | 80 | ;---------------------------------------------------------------------- |
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| 81 | ; |
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| 82 | ; Add in any emulated serial floppy drives, finalize our packed Count and First variables |
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| 83 | ; |
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| 84 | dec ch |
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| 85 | mov al, ch |
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| 86 | js .NoFloppies ; if no drives are present, we store 0ffh |
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| 87 | |
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[258] | 88 | call FloppyDrive_GetCountFromBIOS_or_BDA |
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| 89 | |
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| 90 | push ax |
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| 91 | |
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[262] | 92 | add al, ch ; Add our drives to existing drive count |
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[258] | 93 | cmp al, 3 ; For BDA, max out at 4 drives (ours is zero based) |
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| 94 | jl .MaxBDAFloppiesExceeded |
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| 95 | mov al, 3 |
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| 96 | .MaxBDAFloppiesExceeded: |
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| 97 | eROR_IM al, 2 ; move to bits 6-7 |
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| 98 | inc ax ; low order bit, indicating floppy drive exists |
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| 99 | |
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| 100 | mov ah, [es:BDA.wEquipment] ; Load Equipment WORD low byte |
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| 101 | and ah, 03eh ; Mask off drive number and drives present bit |
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| 102 | or al, ah ; Or in new values |
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| 103 | mov [es:BDA.wEquipment], al ; and store |
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| 104 | |
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| 105 | mov al, 1eh ; BDA pointer to Floppy DPT |
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| 106 | mov si, AH8h_FloppyDPT |
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| 107 | call Interrupts_InstallHandlerToVectorInALFromCSSI |
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| 108 | |
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| 109 | pop ax |
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| 110 | |
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[262] | 111 | shr ch, 1 ; number of drives, 1 or 2 only, to CF flag (clear=1, set=2) |
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[258] | 112 | rcl al, 1 ; starting drive number in upper 7 bits, number of drives in low bit |
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| 113 | .NoFloppies: |
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| 114 | mov [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], al |
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[263] | 115 | %endif |
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[258] | 116 | |
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[3] | 117 | ret |
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| 118 | |
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[261] | 119 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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| 120 | %if FLG_ROMVARS_SERIAL_SCANDETECT != 8 |
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| 121 | %error "DetectDrives is currently coded to assume that FLG_ROMVARS_SERIAL_SCANDETECT is the same bit as the ALT key code in the BDA. Changes in the code will be needed if these values are no longer the same." |
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| 122 | %endif |
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[199] | 123 | %endif |
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| 124 | |
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[242] | 125 | |
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[3] | 126 | ;-------------------------------------------------------------------- |
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[98] | 127 | ; StartDetectionWithDriveSelectByteInBHandStringInAX |
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[3] | 128 | ; Parameters: |
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| 129 | ; BH: Drive Select byte for Drive and Head Register |
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[233] | 130 | ; CX: Offset to "Master" or "Slave" string |
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[3] | 131 | ; CS:BP: Ptr to IDEVARS for the drive |
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| 132 | ; DS: RAMVARS segment |
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| 133 | ; ES: Zero (BDA segment) |
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| 134 | ; Returns: |
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[203] | 135 | ; None |
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[3] | 136 | ; Corrupts registers: |
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[98] | 137 | ; AX, BX, CX, DX, SI, DI |
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[3] | 138 | ;-------------------------------------------------------------------- |
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[98] | 139 | StartDetectionWithDriveSelectByteInBHandStringInAX: |
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| 140 | call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP |
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[120] | 141 | ; Fall to .ReadAtaInfoFromHardDisk |
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[3] | 142 | |
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| 143 | ;-------------------------------------------------------------------- |
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[120] | 144 | ; .ReadAtaInfoFromHardDisk |
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[3] | 145 | ; Parameters: |
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| 146 | ; BH: Drive Select byte for Drive and Head Register |
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| 147 | ; CS:BP: Ptr to IDEVARS for the drive |
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| 148 | ; DS: RAMVARS segment |
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| 149 | ; ES: Zero (BDA segment) |
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| 150 | ; Returns: |
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| 151 | ; CF: Cleared if ATA-information read successfully |
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| 152 | ; Set if any error |
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| 153 | ; Corrupts registers: |
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[150] | 154 | ; AX, BL, CX, DX, SI, DI |
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[3] | 155 | ;-------------------------------------------------------------------- |
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[120] | 156 | .ReadAtaInfoFromHardDisk: |
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[150] | 157 | mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location |
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| 158 | push es |
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| 159 | push si |
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| 160 | push bx |
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| 161 | call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH |
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| 162 | pop bx |
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| 163 | pop si |
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| 164 | pop es |
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[120] | 165 | jnc SHORT CreateBiosTablesForHardDisk |
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| 166 | ; Fall to .ReadAtapiInfoFromDrive |
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[3] | 167 | |
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[120] | 168 | .ReadAtapiInfoFromDrive: ; Not yet implemented |
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| 169 | ;call ReadAtapiInfoFromDrive ; Assume CD-ROM |
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| 170 | ;jnc SHORT _CreateBiosTablesForCDROM |
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[242] | 171 | |
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[203] | 172 | ;jmp short DetectDrives_DriveNotFound |
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| 173 | ;;; fall-through instead of previous jmp instruction |
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| 174 | ;-------------------------------------------------------------------- |
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| 175 | ; DetectDrives_DriveNotFound |
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| 176 | ; Parameters: |
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| 177 | ; Nothing |
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| 178 | ; Returns: |
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| 179 | ; CF: Set (from BootMenuPrint_NullTerminatedStringFromCSSIandSetCF) |
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| 180 | ; Corrupts registers: |
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| 181 | ; AX, SI |
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| 182 | ;-------------------------------------------------------------------- |
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[242] | 183 | DetectDrives_DriveNotFound: |
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[203] | 184 | mov si, g_szNotFound |
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[242] | 185 | jmp BootMenuPrint_NullTerminatedStringFromCSSIandSetCF |
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[3] | 186 | |
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[120] | 187 | |
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[3] | 188 | ;-------------------------------------------------------------------- |
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[98] | 189 | ; CreateBiosTablesForHardDisk |
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[3] | 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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[150] | 193 | ; ES:SI Ptr to ATA information for the drive |
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[3] | 194 | ; DS: RAMVARS segment |
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[98] | 195 | ; ES: BDA/Bootnfo segment |
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[3] | 196 | ; Returns: |
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[98] | 197 | ; Nothing |
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[3] | 198 | ; Corrupts registers: |
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[98] | 199 | ; AX, BX, CX, DX, SI, DI |
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[3] | 200 | ;-------------------------------------------------------------------- |
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[98] | 201 | CreateBiosTablesForHardDisk: |
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[3] | 202 | call CreateDPT_FromAtaInformation |
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[196] | 203 | jc SHORT DetectDrives_DriveNotFound |
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[254] | 204 | call BootMenuInfo_CreateForHardDisk |
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[196] | 205 | jmp short DetectPrint_DriveNameFromBootnfoInESBX |
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| 206 | |
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| 207 | |
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