[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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[376] | 4 | ; |
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[491] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[491] | 12 | ; |
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[376] | 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[491] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[491] | 18 | ; |
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[376] | 19 | |
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[3] | 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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| 23 | ;-------------------------------------------------------------------- |
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| 24 | ; Detects all IDE hard disks to be controlled by this BIOS. |
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| 25 | ; |
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| 26 | ; DetectDrives_FromAllIDEControllers |
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| 27 | ; Parameters: |
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| 28 | ; DS: RAMVARS segment |
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| 29 | ; ES: BDA segment (zero) |
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| 30 | ; Returns: |
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| 31 | ; Nothing |
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| 32 | ; Corrupts registers: |
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| 33 | ; All (not segments) |
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| 34 | ;-------------------------------------------------------------------- |
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| 35 | DetectDrives_FromAllIDEControllers: |
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[33] | 36 | call RamVars_GetIdeControllerCountToCX |
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[3] | 37 | mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS |
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[200] | 38 | |
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| 39 | .DriveDetectLoop: ; Loop through IDEVARS |
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[233] | 40 | push cx |
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| 41 | |
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| 42 | mov cx, g_szDetectMaster |
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| 43 | mov bh, MASK_DRVNHEAD_SET ; Select Master drive |
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[294] | 44 | call StartDetectionWithDriveSelectByteInBHandStringInCX ; Detect and create DPT + BOOTNFO |
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[233] | 45 | |
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| 46 | mov cx, g_szDetectSlave |
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[242] | 47 | mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV |
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[294] | 48 | call StartDetectionWithDriveSelectByteInBHandStringInCX |
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[242] | 49 | |
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[233] | 50 | pop cx |
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| 51 | |
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| 52 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS |
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| 53 | |
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[242] | 54 | %ifdef MODULE_SERIAL |
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[262] | 55 | jcxz .AddHardDisks ; Set to zero on .ideVarsSerialAuto iteration (if any) |
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[196] | 56 | %endif |
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[3] | 57 | loop .DriveDetectLoop |
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[203] | 58 | |
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[242] | 59 | %ifdef MODULE_SERIAL |
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[258] | 60 | ;---------------------------------------------------------------------- |
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[203] | 61 | ; |
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[233] | 62 | ; if serial drive detected, do not scan (avoids duplicate drives and isn't needed - we already have a connection) |
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[203] | 63 | ; |
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[567] | 64 | call FindDPT_ToDSDIforSerialDevice ; Does not modify AX |
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[262] | 65 | jnc .AddHardDisks |
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[233] | 66 | |
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[242] | 67 | mov bp, ROMVARS.ideVarsSerialAuto ; Point to our special IDEVARS structure, just for serial scans |
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| 68 | |
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[492] | 69 | %ifdef MODULE_HOTKEYS |
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[567] | 70 | cmp al, COM_DETECT_HOTKEY_SCANCODE ; Set by last call to HotkeyBar_UpdateDuringDriveDetection above |
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[505] | 71 | je .DriveDetectLoop |
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| 72 | %endif |
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[492] | 73 | |
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[200] | 74 | mov al,[cs:ROMVARS.wFlags] ; Configurator set to always scan? |
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| 75 | or al,[es:BDA.bKBFlgs1] ; Or, did the user hold down the ALT key? |
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| 76 | and al,8 ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_ALWAYSDETECT |
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[242] | 77 | jnz .DriveDetectLoop |
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[233] | 78 | %endif |
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[203] | 79 | |
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[262] | 80 | .AddHardDisks: |
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[258] | 81 | ;---------------------------------------------------------------------- |
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| 82 | ; |
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[262] | 83 | ; Add in hard disks to BDA, finalize our Count and First variables |
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[258] | 84 | ; |
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[269] | 85 | ; Note that we perform the add to bHDCount and store bFirstDrv even if the count is zero. |
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| 86 | ; This is done because we use the value of .bFirstDrv to know how many drives were in the system |
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| 87 | ; at the time of boot, and to return that number on int13h/8h calls. Because the count is zero, |
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| 88 | ; FindDPT_ForDriveNumber will not find any drives that are ours. |
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| 89 | ; |
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[262] | 90 | mov cx, [RAMVARS.wDrvCntAndFlopCnt] ; Our count of hard disks |
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[258] | 91 | |
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[262] | 92 | mov al, [es:BDA.bHDCount] |
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| 93 | add cl, al ; Add our drives to the system count |
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[294] | 94 | mov [es:BDA.bHDCount], cl |
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| 95 | or al, 80h ; Or in hard disk flag |
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| 96 | mov [RAMVARS.bFirstDrv], al ; Store first drive number |
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[262] | 97 | |
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[294] | 98 | .AddFloppies: |
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| 99 | %ifdef MODULE_SERIAL_FLOPPY |
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[262] | 100 | ;---------------------------------------------------------------------- |
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| 101 | ; |
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| 102 | ; Add in any emulated serial floppy drives, finalize our packed Count and First variables |
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| 103 | ; |
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| 104 | dec ch |
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| 105 | mov al, ch |
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[294] | 106 | js .NoFloppies ; if no drives are present, we store 0ffh |
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[262] | 107 | |
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[258] | 108 | call FloppyDrive_GetCountFromBIOS_or_BDA |
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| 109 | |
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| 110 | push ax |
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| 111 | |
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[262] | 112 | add al, ch ; Add our drives to existing drive count |
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[258] | 113 | cmp al, 3 ; For BDA, max out at 4 drives (ours is zero based) |
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[294] | 114 | jb .MaxBDAFloppiesExceeded |
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| 115 | mov al, 3 |
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[258] | 116 | .MaxBDAFloppiesExceeded: |
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| 117 | eROR_IM al, 2 ; move to bits 6-7 |
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| 118 | inc ax ; low order bit, indicating floppy drive exists |
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| 119 | |
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[294] | 120 | mov ah, [es:BDA.wEquipment] ; Load Equipment WORD low byte |
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[258] | 121 | and ah, 03eh ; Mask off drive number and drives present bit |
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| 122 | or al, ah ; Or in new values |
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| 123 | mov [es:BDA.wEquipment], al ; and store |
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| 124 | |
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| 125 | mov al, 1eh ; BDA pointer to Floppy DPT |
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| 126 | mov si, AH8h_FloppyDPT |
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| 127 | call Interrupts_InstallHandlerToVectorInALFromCSSI |
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| 128 | |
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| 129 | pop ax |
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| 130 | |
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[262] | 131 | shr ch, 1 ; number of drives, 1 or 2 only, to CF flag (clear=1, set=2) |
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[258] | 132 | rcl al, 1 ; starting drive number in upper 7 bits, number of drives in low bit |
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[294] | 133 | .NoFloppies: |
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[258] | 134 | mov [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], al |
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[263] | 135 | %endif |
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[3] | 136 | ret |
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| 137 | |
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[294] | 138 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[261] | 139 | %if FLG_ROMVARS_SERIAL_SCANDETECT != 8 |
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| 140 | %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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| 141 | %endif |
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[199] | 142 | %endif |
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| 143 | |
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[242] | 144 | |
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[3] | 145 | ;-------------------------------------------------------------------- |
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[294] | 146 | ; StartDetectionWithDriveSelectByteInBHandStringInCX |
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[3] | 147 | ; Parameters: |
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| 148 | ; BH: Drive Select byte for Drive and Head Register |
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[233] | 149 | ; CX: Offset to "Master" or "Slave" string |
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[3] | 150 | ; CS:BP: Ptr to IDEVARS for the drive |
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| 151 | ; DS: RAMVARS segment |
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| 152 | ; ES: Zero (BDA segment) |
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| 153 | ; Returns: |
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[567] | 154 | ; Nothing |
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[3] | 155 | ; Corrupts registers: |
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[473] | 156 | ; AX, BL, CX, DX, SI, DI |
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[3] | 157 | ;-------------------------------------------------------------------- |
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[294] | 158 | StartDetectionWithDriveSelectByteInBHandStringInCX: |
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[474] | 159 | call DetectPrint_StartDetectWithMasterOrSlaveStringInCXandIdeVarsInCSBP |
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[558] | 160 | |
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[474] | 161 | %ifdef MODULE_HOTKEYS |
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| 162 | call HotkeyBar_UpdateDuringDriveDetection |
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[505] | 163 | %endif |
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[474] | 164 | ; Fall to .ReadAtaInfoFromHardDisk |
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[473] | 165 | |
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[474] | 166 | |
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[3] | 167 | ;-------------------------------------------------------------------- |
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[120] | 168 | ; .ReadAtaInfoFromHardDisk |
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[3] | 169 | ; Parameters: |
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| 170 | ; BH: Drive Select byte for Drive and Head Register |
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[473] | 171 | ; DX: Autodetected port (for devices that support autodetection) |
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[3] | 172 | ; CS:BP: Ptr to IDEVARS for the drive |
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| 173 | ; DS: RAMVARS segment |
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| 174 | ; ES: Zero (BDA segment) |
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| 175 | ; Returns: |
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| 176 | ; CF: Cleared if ATA-information read successfully |
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| 177 | ; Set if any error |
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| 178 | ; Corrupts registers: |
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[150] | 179 | ; AX, BL, CX, DX, SI, DI |
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[3] | 180 | ;-------------------------------------------------------------------- |
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[120] | 181 | .ReadAtaInfoFromHardDisk: |
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[150] | 182 | mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location |
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| 183 | push es |
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| 184 | push si |
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[473] | 185 | push dx |
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[150] | 186 | push bx |
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| 187 | call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH |
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| 188 | pop bx |
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[473] | 189 | pop dx |
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[150] | 190 | pop si |
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| 191 | pop es |
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[120] | 192 | jnc SHORT CreateBiosTablesForHardDisk |
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| 193 | ; Fall to .ReadAtapiInfoFromDrive |
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[3] | 194 | |
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[120] | 195 | .ReadAtapiInfoFromDrive: ; Not yet implemented |
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| 196 | ;call ReadAtapiInfoFromDrive ; Assume CD-ROM |
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| 197 | ;jnc SHORT _CreateBiosTablesForCDROM |
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[242] | 198 | |
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[203] | 199 | ;jmp short DetectDrives_DriveNotFound |
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| 200 | ;;; fall-through instead of previous jmp instruction |
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| 201 | ;-------------------------------------------------------------------- |
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| 202 | ; DetectDrives_DriveNotFound |
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| 203 | ; Parameters: |
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| 204 | ; Nothing |
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| 205 | ; Returns: |
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[567] | 206 | ; CF: Set (from DetectPrint_NullTerminatedStringFromCSSIandSetCF) |
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[203] | 207 | ; Corrupts registers: |
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| 208 | ; AX, SI |
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| 209 | ;-------------------------------------------------------------------- |
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[242] | 210 | DetectDrives_DriveNotFound: |
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[203] | 211 | mov si, g_szNotFound |
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[386] | 212 | jmp DetectPrint_NullTerminatedStringFromCSSIandSetCF |
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[3] | 213 | |
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[120] | 214 | |
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[3] | 215 | ;-------------------------------------------------------------------- |
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[98] | 216 | ; CreateBiosTablesForHardDisk |
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[3] | 217 | ; Parameters: |
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| 218 | ; BH: Drive Select byte for Drive and Head Register |
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[473] | 219 | ; DX: Autodetected port (for devices that support autodetection) |
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[3] | 220 | ; CS:BP: Ptr to IDEVARS for the drive |
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[150] | 221 | ; ES:SI Ptr to ATA information for the drive |
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[3] | 222 | ; DS: RAMVARS segment |
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[397] | 223 | ; ES: BDA segment |
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[3] | 224 | ; Returns: |
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[98] | 225 | ; Nothing |
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[3] | 226 | ; Corrupts registers: |
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[98] | 227 | ; AX, BX, CX, DX, SI, DI |
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[3] | 228 | ;-------------------------------------------------------------------- |
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[98] | 229 | CreateBiosTablesForHardDisk: |
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[441] | 230 | push bx |
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| 231 | call AtaID_VerifyFromESSI |
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| 232 | pop bx |
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[567] | 233 | jnz SHORT DetectDrives_DriveNotFound |
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[3] | 234 | call CreateDPT_FromAtaInformation |
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[196] | 235 | jc SHORT DetectDrives_DriveNotFound |
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[397] | 236 | call DriveDetectInfo_CreateForHardDisk |
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| 237 | jmp SHORT DetectPrint_DriveNameFromDrvDetectInfoInESBX |
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