[150] | 1 | ; Project name : XTIDE Universal BIOS |
---|
[3] | 2 | ; Description : Functions for detecting drive for the BIOS. |
---|
| 3 | |
---|
[376] | 4 | ; |
---|
[491] | 5 | ; XTIDE Universal BIOS and Associated Tools |
---|
[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
---|
[376] | 7 | ; |
---|
| 8 | ; This program is free software; you can redistribute it and/or modify |
---|
| 9 | ; it under the terms of the GNU General Public License as published by |
---|
| 10 | ; the Free Software Foundation; either version 2 of the License, or |
---|
| 11 | ; (at your option) any later version. |
---|
[491] | 12 | ; |
---|
[376] | 13 | ; This program is distributed in the hope that it will be useful, |
---|
| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
[491] | 16 | ; GNU General Public License for more details. |
---|
[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
---|
[491] | 18 | ; |
---|
[376] | 19 | |
---|
[3] | 20 | ; Section containing code |
---|
| 21 | SECTION .text |
---|
| 22 | |
---|
| 23 | ;-------------------------------------------------------------------- |
---|
| 24 | ; Detects all IDE hard disks to be controlled by this BIOS. |
---|
| 25 | ; |
---|
| 26 | ; DetectDrives_FromAllIDEControllers |
---|
| 27 | ; Parameters: |
---|
| 28 | ; DS: RAMVARS segment |
---|
| 29 | ; ES: BDA segment (zero) |
---|
| 30 | ; Returns: |
---|
| 31 | ; Nothing |
---|
| 32 | ; Corrupts registers: |
---|
| 33 | ; All (not segments) |
---|
| 34 | ;-------------------------------------------------------------------- |
---|
| 35 | DetectDrives_FromAllIDEControllers: |
---|
[33] | 36 | call RamVars_GetIdeControllerCountToCX |
---|
[3] | 37 | mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS |
---|
[200] | 38 | |
---|
| 39 | .DriveDetectLoop: ; Loop through IDEVARS |
---|
[233] | 40 | push cx |
---|
| 41 | |
---|
| 42 | mov cx, g_szDetectMaster |
---|
| 43 | mov bh, MASK_DRVNHEAD_SET ; Select Master drive |
---|
[294] | 44 | call StartDetectionWithDriveSelectByteInBHandStringInCX ; Detect and create DPT + BOOTNFO |
---|
[233] | 45 | |
---|
[614] | 46 | test BYTE [cs:bp+IDEVARS.drvParamsSlave+DRVPARAMS.wFlags], FLG_DRVPARAMS_DO_NOT_DETECT |
---|
| 47 | jnz SHORT .SkipSlaveDetection |
---|
[233] | 48 | mov cx, g_szDetectSlave |
---|
[242] | 49 | mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV |
---|
[294] | 50 | call StartDetectionWithDriveSelectByteInBHandStringInCX |
---|
[614] | 51 | .SkipSlaveDetection: |
---|
[242] | 52 | |
---|
[580] | 53 | %ifdef MODULE_HOTKEYS |
---|
| 54 | %ifdef MODULE_SERIAL |
---|
| 55 | ; This is only needed for hotkey F6 (ComDtct) to work |
---|
| 56 | call ScanHotkeysFromKeyBufferAndStoreToBootvars ; Done here while CX is still protected |
---|
| 57 | %endif |
---|
| 58 | %endif |
---|
| 59 | |
---|
[233] | 60 | pop cx |
---|
| 61 | |
---|
| 62 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS |
---|
| 63 | |
---|
[242] | 64 | %ifdef MODULE_SERIAL |
---|
[262] | 65 | jcxz .AddHardDisks ; Set to zero on .ideVarsSerialAuto iteration (if any) |
---|
[196] | 66 | %endif |
---|
[3] | 67 | loop .DriveDetectLoop |
---|
[203] | 68 | |
---|
[242] | 69 | %ifdef MODULE_SERIAL |
---|
[258] | 70 | ;---------------------------------------------------------------------- |
---|
[203] | 71 | ; |
---|
[233] | 72 | ; if serial drive detected, do not scan (avoids duplicate drives and isn't needed - we already have a connection) |
---|
[203] | 73 | ; |
---|
[567] | 74 | call FindDPT_ToDSDIforSerialDevice ; Does not modify AX |
---|
[605] | 75 | jnc SHORT .AddHardDisks |
---|
[233] | 76 | |
---|
[242] | 77 | mov bp, ROMVARS.ideVarsSerialAuto ; Point to our special IDEVARS structure, just for serial scans |
---|
| 78 | |
---|
[492] | 79 | %ifdef MODULE_HOTKEYS |
---|
[580] | 80 | cmp al, COM_DETECT_HOTKEY_SCANCODE ; Set by last call to ScanHotkeysFromKeyBufferAndStoreToBootvars above |
---|
[605] | 81 | je SHORT .DriveDetectLoop |
---|
[505] | 82 | %endif |
---|
[492] | 83 | |
---|
[568] | 84 | mov al, [cs:ROMVARS.wFlags] ; Configurator set to always scan? |
---|
| 85 | or al, [es:BDA.bKBFlgs1] ; Or, did the user hold down the ALT key? |
---|
[589] | 86 | and al, 8 ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_SCANDETECT |
---|
[605] | 87 | jnz SHORT .DriveDetectLoop |
---|
[580] | 88 | %endif ; MODULE_SERIAL |
---|
[203] | 89 | |
---|
[262] | 90 | .AddHardDisks: |
---|
[258] | 91 | ;---------------------------------------------------------------------- |
---|
| 92 | ; |
---|
[262] | 93 | ; Add in hard disks to BDA, finalize our Count and First variables |
---|
[258] | 94 | ; |
---|
[269] | 95 | ; Note that we perform the add to bHDCount and store bFirstDrv even if the count is zero. |
---|
| 96 | ; This is done because we use the value of .bFirstDrv to know how many drives were in the system |
---|
| 97 | ; at the time of boot, and to return that number on int13h/8h calls. Because the count is zero, |
---|
| 98 | ; FindDPT_ForDriveNumber will not find any drives that are ours. |
---|
| 99 | ; |
---|
[593] | 100 | |
---|
[605] | 101 | ; This is a hack to get Windows 9x to load its built-in protected mode IDE driver. |
---|
[596] | 102 | ; |
---|
[593] | 103 | ; The Windows hack has two parts. First part is to try to alter CMOS address 12h as that |
---|
[605] | 104 | ; is what Windows 9x driver reads to detect IDE drives. Altering is not possible on all |
---|
[596] | 105 | ; systems since CMOS has a checksum but its location is not standardized. We will first |
---|
[593] | 106 | ; try to detect valid checksum. If it succeeds, then it is safe to assume this system |
---|
| 107 | ; has compatible CMOS and we can alter it. |
---|
[605] | 108 | ; If verify fails, we do the more dirty hack to zero BDA drive count. Then Windows 9x works |
---|
[593] | 109 | ; as long as user has configured at least one drive in the BIOS setup. |
---|
[605] | 110 | %ifdef MODULE_WIN9X_CMOS_HACK |
---|
[601] | 111 | mov dl, HARD_DISK_TYPES |
---|
| 112 | call CMOS_ReadFromIndexInDLtoAL |
---|
| 113 | test al, 0F0h |
---|
[605] | 114 | jnz SHORT .ClearBdaDriveCount ; CMOS byte 12h is ready for Windows 9x |
---|
[601] | 115 | call CMOS_Verify10hTo2Dh ; Can we modify CMOS? |
---|
| 116 | jnz SHORT .ClearBdaDriveCount ; Unsupported BIOS, use plan B |
---|
[593] | 117 | |
---|
[601] | 118 | ; Now we can alter CMOS location 12h. Award BIOS locks if we set drive 0 type to Fh |
---|
[605] | 119 | ; (but accept changes to drive type 1). Windows 9x requires that the drive 0 type is |
---|
[601] | 120 | ; non zero and ignores drive 1 type. So if we only set drive 1, then Award BIOS |
---|
[605] | 121 | ; won't give problems but Windows 9x stays in MS-DOS compatibility mode. |
---|
[601] | 122 | ; |
---|
| 123 | ; For Award BIOSes we could set the Drive 0 type to 1 and then clear the BDA drive count. |
---|
[605] | 124 | ; So essentially we could automatically do what user needs to do manually to get Windows 9x |
---|
[601] | 125 | ; working on Award BIOSes. However, I think that should be left to do manually since |
---|
[605] | 126 | ; there may be SCSI drives on the system or FLG_ROMVARS_CLEAR_BDA_HD_COUNT could |
---|
[601] | 127 | ; be intentionally cleared and forcing the dummy drive might cause only trouble. |
---|
[596] | 128 | |
---|
[601] | 129 | ; Try to detect Award BIOS (Seems to work on a tested 128k BIOS so hopefully |
---|
| 130 | ; there will be no need to scan E000h segment) |
---|
| 131 | mov cx, 65536 - 4 |
---|
| 132 | mov eax, 'Awar' ; Four characters should be enough |
---|
| 133 | mov di, 0F000h ; Scan 64k starting from segment F000h |
---|
| 134 | mov fs, di ; No need to preserve FS since we set it to zero soon when we boot |
---|
| 135 | xor di, di |
---|
| 136 | .ScanNextCharacters: |
---|
| 137 | cmp [fs:di], eax |
---|
| 138 | je SHORT .ClearBdaDriveCount ; Award detected, cannot modify CMOS |
---|
| 139 | inc di ; Increment offset by one character (not four) |
---|
| 140 | loop .ScanNextCharacters |
---|
[598] | 141 | |
---|
[601] | 142 | ; Now it should be safe to write |
---|
| 143 | mov dl, HARD_DISK_TYPES |
---|
| 144 | mov al, 0F0h ; Drive 0 type 16...47 (supposed to be defined elsewhere in the CMOS) |
---|
| 145 | call CMOS_WriteALtoIndexInDL |
---|
| 146 | call CMOS_StoreNewChecksumFor10hto2Dh |
---|
[594] | 147 | .ClearBdaDriveCount: |
---|
[605] | 148 | %endif ; MODULE_WIN9X_CMOS_HACK |
---|
[593] | 149 | |
---|
[605] | 150 | mov cx, [RAMVARS.wDrvCntAndFlopCnt] ; Our count of hard disks |
---|
| 151 | mov al, [es:BDA.bHDCount] |
---|
| 152 | %ifndef MODULE_MFM_COMPATIBILITY |
---|
| 153 | ; This is excluded when MODULE_MFM_COMPATIBILITY is included because it doesn't make sense to use both at the same time anyway. |
---|
| 154 | ; Note that the option to "Remove other hard drives" is still visible in XTIDECFG.COM for builds including MODULE_MFM_COMPATIBILITY. |
---|
| 155 | ; Changing that option just won't do anything. We might want to remove the option for builds that contain MODULE_MFM_COMPATIBILITY |
---|
| 156 | ; but that would require a ROMVARS flag that is probably better spent on other things. |
---|
| 157 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_CLEAR_BDA_HD_COUNT ; Clears CF |
---|
[593] | 158 | jz SHORT .ContinueInitialization |
---|
[605] | 159 | %ifdef USE_UNDOC_INTEL |
---|
| 160 | salc |
---|
| 161 | %else |
---|
| 162 | xor al, al |
---|
| 163 | %endif |
---|
[593] | 164 | .ContinueInitialization: |
---|
[605] | 165 | %endif ; MODULE_MFM_COMPATIBILITY |
---|
| 166 | add cl, al |
---|
| 167 | mov [es:BDA.bHDCount], cl ; Update the system count |
---|
[601] | 168 | or al, 80h ; Or in hard disk flag |
---|
| 169 | mov [RAMVARS.bFirstDrv], al ; Store first drive number |
---|
[262] | 170 | |
---|
[294] | 171 | .AddFloppies: |
---|
| 172 | %ifdef MODULE_SERIAL_FLOPPY |
---|
[262] | 173 | ;---------------------------------------------------------------------- |
---|
| 174 | ; |
---|
| 175 | ; Add in any emulated serial floppy drives, finalize our packed Count and First variables |
---|
| 176 | ; |
---|
| 177 | dec ch |
---|
| 178 | mov al, ch |
---|
[601] | 179 | js SHORT .NoFloppies ; If no drives are present, we store 0FFh |
---|
[262] | 180 | |
---|
[258] | 181 | call FloppyDrive_GetCountFromBIOS_or_BDA |
---|
| 182 | |
---|
| 183 | push ax |
---|
| 184 | |
---|
[262] | 185 | add al, ch ; Add our drives to existing drive count |
---|
[258] | 186 | cmp al, 3 ; For BDA, max out at 4 drives (ours is zero based) |
---|
[605] | 187 | jb SHORT .MaxBDAFloppiesExceeded |
---|
[294] | 188 | mov al, 3 |
---|
[258] | 189 | .MaxBDAFloppiesExceeded: |
---|
| 190 | eROR_IM al, 2 ; move to bits 6-7 |
---|
| 191 | inc ax ; low order bit, indicating floppy drive exists |
---|
| 192 | |
---|
[568] | 193 | mov ah, 3Eh ; AND mask to AH (all bits set except floppy drive count/present) |
---|
| 194 | and ah, [es:BDA.wEquipment] ; Load Equipment WORD low byte and mask off drive number and drives present bit |
---|
[258] | 195 | or al, ah ; Or in new values |
---|
| 196 | mov [es:BDA.wEquipment], al ; and store |
---|
| 197 | |
---|
[568] | 198 | mov al, 1Eh ; BDA pointer to Floppy DPT |
---|
[258] | 199 | mov si, AH8h_FloppyDPT |
---|
| 200 | call Interrupts_InstallHandlerToVectorInALFromCSSI |
---|
| 201 | |
---|
| 202 | pop ax |
---|
| 203 | |
---|
[262] | 204 | shr ch, 1 ; number of drives, 1 or 2 only, to CF flag (clear=1, set=2) |
---|
[589] | 205 | eRCL_IM al, 1 ; starting drive number in upper 7 bits, number of drives in low bit |
---|
[294] | 206 | .NoFloppies: |
---|
[258] | 207 | mov [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], al |
---|
[263] | 208 | %endif |
---|
[3] | 209 | ret |
---|
| 210 | |
---|
[294] | 211 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
---|
[261] | 212 | %if FLG_ROMVARS_SERIAL_SCANDETECT != 8 |
---|
| 213 | %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." |
---|
| 214 | %endif |
---|
[199] | 215 | %endif |
---|
| 216 | |
---|
[242] | 217 | |
---|
[3] | 218 | ;-------------------------------------------------------------------- |
---|
[294] | 219 | ; StartDetectionWithDriveSelectByteInBHandStringInCX |
---|
[3] | 220 | ; Parameters: |
---|
| 221 | ; BH: Drive Select byte for Drive and Head Register |
---|
[233] | 222 | ; CX: Offset to "Master" or "Slave" string |
---|
[3] | 223 | ; CS:BP: Ptr to IDEVARS for the drive |
---|
| 224 | ; DS: RAMVARS segment |
---|
| 225 | ; ES: Zero (BDA segment) |
---|
| 226 | ; Returns: |
---|
[567] | 227 | ; Nothing |
---|
[3] | 228 | ; Corrupts registers: |
---|
[473] | 229 | ; AX, BL, CX, DX, SI, DI |
---|
[3] | 230 | ;-------------------------------------------------------------------- |
---|
[294] | 231 | StartDetectionWithDriveSelectByteInBHandStringInCX: |
---|
[474] | 232 | call DetectPrint_StartDetectWithMasterOrSlaveStringInCXandIdeVarsInCSBP |
---|
| 233 | ; Fall to .ReadAtaInfoFromHardDisk |
---|
[473] | 234 | |
---|
[474] | 235 | |
---|
[3] | 236 | ;-------------------------------------------------------------------- |
---|
[120] | 237 | ; .ReadAtaInfoFromHardDisk |
---|
[3] | 238 | ; Parameters: |
---|
| 239 | ; BH: Drive Select byte for Drive and Head Register |
---|
[473] | 240 | ; DX: Autodetected port (for devices that support autodetection) |
---|
[3] | 241 | ; CS:BP: Ptr to IDEVARS for the drive |
---|
| 242 | ; DS: RAMVARS segment |
---|
| 243 | ; ES: Zero (BDA segment) |
---|
| 244 | ; Returns: |
---|
| 245 | ; CF: Cleared if ATA-information read successfully |
---|
| 246 | ; Set if any error |
---|
| 247 | ; Corrupts registers: |
---|
[150] | 248 | ; AX, BL, CX, DX, SI, DI |
---|
[3] | 249 | ;-------------------------------------------------------------------- |
---|
[120] | 250 | .ReadAtaInfoFromHardDisk: |
---|
[601] | 251 | mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location |
---|
[150] | 252 | push es |
---|
| 253 | push si |
---|
[473] | 254 | push dx |
---|
[150] | 255 | push bx |
---|
| 256 | call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH |
---|
| 257 | pop bx |
---|
[473] | 258 | pop dx |
---|
[150] | 259 | pop si |
---|
| 260 | pop es |
---|
[120] | 261 | jnc SHORT CreateBiosTablesForHardDisk |
---|
| 262 | ; Fall to .ReadAtapiInfoFromDrive |
---|
[3] | 263 | |
---|
[601] | 264 | .ReadAtapiInfoFromDrive: ; Not yet implemented |
---|
| 265 | ;call ReadAtapiInfoFromDrive ; Assume CD-ROM |
---|
[120] | 266 | ;jnc SHORT _CreateBiosTablesForCDROM |
---|
[242] | 267 | |
---|
[203] | 268 | ;jmp short DetectDrives_DriveNotFound |
---|
| 269 | ;;; fall-through instead of previous jmp instruction |
---|
| 270 | ;-------------------------------------------------------------------- |
---|
| 271 | ; DetectDrives_DriveNotFound |
---|
| 272 | ; Parameters: |
---|
| 273 | ; Nothing |
---|
| 274 | ; Returns: |
---|
[567] | 275 | ; CF: Set (from DetectPrint_NullTerminatedStringFromCSSIandSetCF) |
---|
[203] | 276 | ; Corrupts registers: |
---|
| 277 | ; AX, SI |
---|
| 278 | ;-------------------------------------------------------------------- |
---|
[242] | 279 | DetectDrives_DriveNotFound: |
---|
[203] | 280 | mov si, g_szNotFound |
---|
[386] | 281 | jmp DetectPrint_NullTerminatedStringFromCSSIandSetCF |
---|
[3] | 282 | |
---|
[120] | 283 | |
---|
[3] | 284 | ;-------------------------------------------------------------------- |
---|
[98] | 285 | ; CreateBiosTablesForHardDisk |
---|
[3] | 286 | ; Parameters: |
---|
| 287 | ; BH: Drive Select byte for Drive and Head Register |
---|
[473] | 288 | ; DX: Autodetected port (for devices that support autodetection) |
---|
[3] | 289 | ; CS:BP: Ptr to IDEVARS for the drive |
---|
[150] | 290 | ; ES:SI Ptr to ATA information for the drive |
---|
[3] | 291 | ; DS: RAMVARS segment |
---|
[397] | 292 | ; ES: BDA segment |
---|
[3] | 293 | ; Returns: |
---|
[98] | 294 | ; Nothing |
---|
[3] | 295 | ; Corrupts registers: |
---|
[98] | 296 | ; AX, BX, CX, DX, SI, DI |
---|
[3] | 297 | ;-------------------------------------------------------------------- |
---|
[98] | 298 | CreateBiosTablesForHardDisk: |
---|
[580] | 299 | %ifndef NO_ATAID_VALIDATION |
---|
[441] | 300 | push bx |
---|
| 301 | call AtaID_VerifyFromESSI |
---|
| 302 | pop bx |
---|
[567] | 303 | jnz SHORT DetectDrives_DriveNotFound |
---|
[580] | 304 | %endif |
---|
[3] | 305 | call CreateDPT_FromAtaInformation |
---|
[196] | 306 | jc SHORT DetectDrives_DriveNotFound |
---|
[397] | 307 | call DriveDetectInfo_CreateForHardDisk |
---|
| 308 | jmp SHORT DetectPrint_DriveNameFromDrvDetectInfoInESBX |
---|