source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm@ 593

Last change on this file since 593 was 593, checked in by Tomi Tilli, 6 years ago

Flashing now works again.
Hack to get Windows 95 to work properly (MODULE_WIN95_CMOS_HACK included for 386 builds by default).
Edited makefile to produce large 386 build.
Fixed recovery time for QDI Vision VLB-IDE controllers.
No more warnings with Nasm 2.13.xx and later.
File dialog now properly restores default drive when file selection is cancelled.
File size: 9.9 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Functions for detecting drive for the BIOS.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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.
12;
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
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20; Section containing code
21SECTION .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;--------------------------------------------------------------------
35DetectDrives_FromAllIDEControllers:
36 call RamVars_GetIdeControllerCountToCX
37 mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS
38
39.DriveDetectLoop: ; Loop through IDEVARS
40 push cx
41
42 mov cx, g_szDetectMaster
43 mov bh, MASK_DRVNHEAD_SET ; Select Master drive
44 call StartDetectionWithDriveSelectByteInBHandStringInCX ; Detect and create DPT + BOOTNFO
45
46 mov cx, g_szDetectSlave
47 mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV
48 call StartDetectionWithDriveSelectByteInBHandStringInCX
49
50%ifdef MODULE_HOTKEYS
51%ifdef MODULE_SERIAL
52 ; This is only needed for hotkey F6 (ComDtct) to work
53 call ScanHotkeysFromKeyBufferAndStoreToBootvars ; Done here while CX is still protected
54%endif
55%endif
56
57 pop cx
58
59 add bp, BYTE IDEVARS_size ; Point to next IDEVARS
60
61%ifdef MODULE_SERIAL
62 jcxz .AddHardDisks ; Set to zero on .ideVarsSerialAuto iteration (if any)
63%endif
64 loop .DriveDetectLoop
65
66%ifdef MODULE_SERIAL
67;----------------------------------------------------------------------
68;
69; if serial drive detected, do not scan (avoids duplicate drives and isn't needed - we already have a connection)
70;
71 call FindDPT_ToDSDIforSerialDevice ; Does not modify AX
72 jnc .AddHardDisks
73
74 mov bp, ROMVARS.ideVarsSerialAuto ; Point to our special IDEVARS structure, just for serial scans
75
76%ifdef MODULE_HOTKEYS
77 cmp al, COM_DETECT_HOTKEY_SCANCODE ; Set by last call to ScanHotkeysFromKeyBufferAndStoreToBootvars above
78 je .DriveDetectLoop
79%endif
80
81 mov al, [cs:ROMVARS.wFlags] ; Configurator set to always scan?
82 or al, [es:BDA.bKBFlgs1] ; Or, did the user hold down the ALT key?
83 and al, 8 ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_SCANDETECT
84 jnz .DriveDetectLoop
85%endif ; MODULE_SERIAL
86
87.AddHardDisks:
88;----------------------------------------------------------------------
89;
90; Add in hard disks to BDA, finalize our Count and First variables
91;
92; Note that we perform the add to bHDCount and store bFirstDrv even if the count is zero.
93; This is done because we use the value of .bFirstDrv to know how many drives were in the system
94; at the time of boot, and to return that number on int13h/8h calls. Because the count is zero,
95; FindDPT_ForDriveNumber will not find any drives that are ours.
96;
97
98; Here we might want to replace BIOS configured drives with the ones we detected.
99; Primary reason is to support dynamic overlay feature in the future. Second reason
100; is a hack to get Windows 95 load proper IDE drivers.
101;
102; The Windows hack has two parts. First part is to try to alter CMOS address 12h as that
103; is what Windows 95 driver reads to detect IDE drives. Altering is not possible on all
104; systems since CMOS has a checksum but it's location is not standardized. We will first
105; try to detect valid checksum. If it succeeds, then it is safe to assume this system
106; has compatible CMOS and we can alter it.
107; If verify fails, we do the more dirty hack to zero BDA drive count. Then Windows 95 works
108; as long as user has configured at least one drive in the BIOS setup.
109
110%ifdef USE_AT ; FLG_ROMVARS_IGNORE_MOTHERBOARD_DRIVES is for AT builds only
111
112 %ifdef MODULE_WIN95_CMOS_HACK
113 mov dl, HARD_DISK_TYPES
114 call CMOS_ReadFromIndexInDLtoAL
115 test al, al
116 jnz SHORT .ContinueInitialization ; CMOS byte 12h is ready for Windows 95
117 call CMOS_Verify10hTo2Dh
118 jnz SHORT .ClearBdaDriveCount ; Unsupported BIOS, use plan B
119
120 ; Now we can alter CMOS location 12h
121 mov dl, HARD_DISK_TYPES
122 mov al, 0F0h ; Drive 0 type 16...47 but Windows doesn't care as long as this is not zero
123 call CMOS_WriteALtoIndexInDL
124 call CMOS_StoreNewChecksumFor10hto2Dh
125 %endif
126
127 test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_IGNORE_MOTHERBOARD_DRIVES
128 jz SHORT .ContinueInitialization
129.ClearBdaDriveCount:
130 mov BYTE [es:BDA.bHDCount], 0 ; Set hard disk count to zero
131.ContinueInitialization:
132%endif
133
134 mov cx, [RAMVARS.wDrvCntAndFlopCnt] ; Our count of hard disks
135 mov al, [es:BDA.bHDCount]
136 add [es:BDA.bHDCount], cl ; Add our drives to the system count
137 or al, 80h ; Or in hard disk flag
138 mov [RAMVARS.bFirstDrv], al ; Store first drive number
139
140.AddFloppies:
141%ifdef MODULE_SERIAL_FLOPPY
142;----------------------------------------------------------------------
143;
144; Add in any emulated serial floppy drives, finalize our packed Count and First variables
145;
146 dec ch
147 mov al, ch
148 js .NoFloppies ; if no drives are present, we store 0ffh
149
150 call FloppyDrive_GetCountFromBIOS_or_BDA
151
152 push ax
153
154 add al, ch ; Add our drives to existing drive count
155 cmp al, 3 ; For BDA, max out at 4 drives (ours is zero based)
156 jb .MaxBDAFloppiesExceeded
157 mov al, 3
158.MaxBDAFloppiesExceeded:
159 eROR_IM al, 2 ; move to bits 6-7
160 inc ax ; low order bit, indicating floppy drive exists
161
162 mov ah, 3Eh ; AND mask to AH (all bits set except floppy drive count/present)
163 and ah, [es:BDA.wEquipment] ; Load Equipment WORD low byte and mask off drive number and drives present bit
164 or al, ah ; Or in new values
165 mov [es:BDA.wEquipment], al ; and store
166
167 mov al, 1Eh ; BDA pointer to Floppy DPT
168 mov si, AH8h_FloppyDPT
169 call Interrupts_InstallHandlerToVectorInALFromCSSI
170
171 pop ax
172
173 shr ch, 1 ; number of drives, 1 or 2 only, to CF flag (clear=1, set=2)
174 eRCL_IM al, 1 ; starting drive number in upper 7 bits, number of drives in low bit
175.NoFloppies:
176 mov [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], al
177%endif
178 ret
179
180%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
181 %if FLG_ROMVARS_SERIAL_SCANDETECT != 8
182 %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."
183 %endif
184%endif
185
186
187;--------------------------------------------------------------------
188; StartDetectionWithDriveSelectByteInBHandStringInCX
189; Parameters:
190; BH: Drive Select byte for Drive and Head Register
191; CX: Offset to "Master" or "Slave" string
192; CS:BP: Ptr to IDEVARS for the drive
193; DS: RAMVARS segment
194; ES: Zero (BDA segment)
195; Returns:
196; Nothing
197; Corrupts registers:
198; AX, BL, CX, DX, SI, DI
199;--------------------------------------------------------------------
200StartDetectionWithDriveSelectByteInBHandStringInCX:
201 call DetectPrint_StartDetectWithMasterOrSlaveStringInCXandIdeVarsInCSBP
202
203%ifdef MODULE_HOTKEYS
204 call HotkeyBar_UpdateDuringDriveDetection
205%endif
206 ; Fall to .ReadAtaInfoFromHardDisk
207
208
209;--------------------------------------------------------------------
210; .ReadAtaInfoFromHardDisk
211; Parameters:
212; BH: Drive Select byte for Drive and Head Register
213; DX: Autodetected port (for devices that support autodetection)
214; CS:BP: Ptr to IDEVARS for the drive
215; DS: RAMVARS segment
216; ES: Zero (BDA segment)
217; Returns:
218; CF: Cleared if ATA-information read successfully
219; Set if any error
220; Corrupts registers:
221; AX, BL, CX, DX, SI, DI
222;--------------------------------------------------------------------
223.ReadAtaInfoFromHardDisk:
224 mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location
225 push es
226 push si
227 push dx
228 push bx
229 call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH
230 pop bx
231 pop dx
232 pop si
233 pop es
234 jnc SHORT CreateBiosTablesForHardDisk
235 ; Fall to .ReadAtapiInfoFromDrive
236
237.ReadAtapiInfoFromDrive: ; Not yet implemented
238 ;call ReadAtapiInfoFromDrive ; Assume CD-ROM
239 ;jnc SHORT _CreateBiosTablesForCDROM
240
241 ;jmp short DetectDrives_DriveNotFound
242;;; fall-through instead of previous jmp instruction
243;--------------------------------------------------------------------
244; DetectDrives_DriveNotFound
245; Parameters:
246; Nothing
247; Returns:
248; CF: Set (from DetectPrint_NullTerminatedStringFromCSSIandSetCF)
249; Corrupts registers:
250; AX, SI
251;--------------------------------------------------------------------
252DetectDrives_DriveNotFound:
253 mov si, g_szNotFound
254 jmp DetectPrint_NullTerminatedStringFromCSSIandSetCF
255
256
257;--------------------------------------------------------------------
258; CreateBiosTablesForHardDisk
259; Parameters:
260; BH: Drive Select byte for Drive and Head Register
261; DX: Autodetected port (for devices that support autodetection)
262; CS:BP: Ptr to IDEVARS for the drive
263; ES:SI Ptr to ATA information for the drive
264; DS: RAMVARS segment
265; ES: BDA segment
266; Returns:
267; Nothing
268; Corrupts registers:
269; AX, BX, CX, DX, SI, DI
270;--------------------------------------------------------------------
271CreateBiosTablesForHardDisk:
272%ifndef NO_ATAID_VALIDATION
273 push bx
274 call AtaID_VerifyFromESSI
275 pop bx
276 jnz SHORT DetectDrives_DriveNotFound
277%endif
278 call CreateDPT_FromAtaInformation
279 jc SHORT DetectDrives_DriveNotFound
280 call DriveDetectInfo_CreateForHardDisk
281 jmp SHORT DetectPrint_DriveNameFromDrvDetectInfoInESBX
Note: See TracBrowser for help on using the repository browser.