source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm@ 562

Last change on this file since 562 was 558, checked in by krille_n_@…, 11 years ago

Changes:

  • Building the BIOS Drive Information Tool now works again.
  • Moved all XT-CF related code to MODULE_8BIT_IDE_ADVANCED. I don't see how an XT-CF card could work without *_ADVANCED anyway but if I'm wrong, feel free to undo this. Note! The autodetection code in XTIDECFG has NOT been changed to reflect this (still relies on MODULE_8BIT_IDE).
  • Optimizations and fixes in general.
File size: 8.5 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 pop cx
51
52 add bp, BYTE IDEVARS_size ; Point to next IDEVARS
53
54%ifdef MODULE_SERIAL
55 jcxz .AddHardDisks ; Set to zero on .ideVarsSerialAuto iteration (if any)
56%endif
57 loop .DriveDetectLoop
58
59%ifdef MODULE_SERIAL
60;----------------------------------------------------------------------
61;
62; if serial drive detected, do not scan (avoids duplicate drives and isn't needed - we already have a connection)
63;
64 call FindDPT_ToDSDIforSerialDevice ; does not modify AX
65 jnc .AddHardDisks
66
67 mov bp, ROMVARS.ideVarsSerialAuto ; Point to our special IDEVARS structure, just for serial scans
68
69%ifdef MODULE_HOTKEYS
70 cmp al, COM_DETECT_HOTKEY_SCANCODE ; Set by last call to HotkeyBar_UpdateDuringDriveDetection above
71 je .DriveDetectLoop
72%endif
73
74 mov al,[cs:ROMVARS.wFlags] ; Configurator set to always scan?
75 or al,[es:BDA.bKBFlgs1] ; Or, did the user hold down the ALT key?
76 and al,8 ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_ALWAYSDETECT
77 jnz .DriveDetectLoop
78%endif
79
80.AddHardDisks:
81;----------------------------------------------------------------------
82;
83; Add in hard disks to BDA, finalize our Count and First variables
84;
85; Note that we perform the add to bHDCount and store bFirstDrv even if the count is zero.
86; This is done because we use the value of .bFirstDrv to know how many drives were in the system
87; at the time of boot, and to return that number on int13h/8h calls. Because the count is zero,
88; FindDPT_ForDriveNumber will not find any drives that are ours.
89;
90 mov cx, [RAMVARS.wDrvCntAndFlopCnt] ; Our count of hard disks
91
92 mov al, [es:BDA.bHDCount]
93 add cl, al ; Add our drives to the system count
94 mov [es:BDA.bHDCount], cl
95 or al, 80h ; Or in hard disk flag
96 mov [RAMVARS.bFirstDrv], al ; Store first drive number
97
98.AddFloppies:
99%ifdef MODULE_SERIAL_FLOPPY
100;----------------------------------------------------------------------
101;
102; Add in any emulated serial floppy drives, finalize our packed Count and First variables
103;
104 dec ch
105 mov al, ch
106 js .NoFloppies ; if no drives are present, we store 0ffh
107
108 call FloppyDrive_GetCountFromBIOS_or_BDA
109
110 push ax
111
112 add al, ch ; Add our drives to existing drive count
113 cmp al, 3 ; For BDA, max out at 4 drives (ours is zero based)
114 jb .MaxBDAFloppiesExceeded
115 mov al, 3
116.MaxBDAFloppiesExceeded:
117 eROR_IM al, 2 ; move to bits 6-7
118 inc ax ; low order bit, indicating floppy drive exists
119
120 mov ah, [es:BDA.wEquipment] ; Load Equipment WORD low byte
121 and ah, 03eh ; Mask off drive number and drives present bit
122 or al, ah ; Or in new values
123 mov [es:BDA.wEquipment], al ; and store
124
125 mov al, 1eh ; BDA pointer to Floppy DPT
126 mov si, AH8h_FloppyDPT
127 call Interrupts_InstallHandlerToVectorInALFromCSSI
128
129 pop ax
130
131 shr ch, 1 ; number of drives, 1 or 2 only, to CF flag (clear=1, set=2)
132 rcl al, 1 ; starting drive number in upper 7 bits, number of drives in low bit
133.NoFloppies:
134 mov [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], al
135%endif
136
137%ifdef MODULE_8BIT_IDE_ADVANCED
138NoSlaveDriveAvailable:
139%endif
140 ret
141
142%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
143 %if FLG_ROMVARS_SERIAL_SCANDETECT != 8
144 %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."
145 %endif
146%endif
147
148
149;--------------------------------------------------------------------
150; StartDetectionWithDriveSelectByteInBHandStringInCX
151; Parameters:
152; BH: Drive Select byte for Drive and Head Register
153; CX: Offset to "Master" or "Slave" string
154; CS:BP: Ptr to IDEVARS for the drive
155; DS: RAMVARS segment
156; ES: Zero (BDA segment)
157; Returns:
158; Nothing
159; Corrupts registers:
160; AX, BL, CX, DX, SI, DI
161;--------------------------------------------------------------------
162StartDetectionWithDriveSelectByteInBHandStringInCX:
163%ifdef MODULE_8BIT_IDE_ADVANCED
164 mov al, [cs:bp+IDEVARS.bDevice]
165 cmp al, DEVICE_8BIT_XTCF_PIO8
166 jb SHORT .DoNotSkipSlaveDriveDetection
167 cmp al, DEVICE_8BIT_XTCF_DMA
168 ja SHORT .DoNotSkipSlaveDriveDetection
169
170 ; XT-CF do not support slave drives so skip detection
171 test bh, FLG_DRVNHEAD_DRV
172 jnz SHORT NoSlaveDriveAvailable
173.DoNotSkipSlaveDriveDetection:
174%endif ; MODULE_8BIT_IDE_ADVANCED
175
176 call DetectPrint_StartDetectWithMasterOrSlaveStringInCXandIdeVarsInCSBP
177
178%ifdef MODULE_HOTKEYS
179 call HotkeyBar_UpdateDuringDriveDetection
180%endif
181 ; Fall to .ReadAtaInfoFromHardDisk
182
183
184;--------------------------------------------------------------------
185; .ReadAtaInfoFromHardDisk
186; Parameters:
187; BH: Drive Select byte for Drive and Head Register
188; DX: Autodetected port (for devices that support autodetection)
189; CS:BP: Ptr to IDEVARS for the drive
190; DS: RAMVARS segment
191; ES: Zero (BDA segment)
192; Returns:
193; CF: Cleared if ATA-information read successfully
194; Set if any error
195; Corrupts registers:
196; AX, BL, CX, DX, SI, DI
197;--------------------------------------------------------------------
198.ReadAtaInfoFromHardDisk:
199 mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location
200 push es
201 push si
202 push dx
203 push bx
204 call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH
205 pop bx
206 pop dx
207 pop si
208 pop es
209 jnc SHORT CreateBiosTablesForHardDisk
210 ; Fall to .ReadAtapiInfoFromDrive
211
212.ReadAtapiInfoFromDrive: ; Not yet implemented
213 ;call ReadAtapiInfoFromDrive ; Assume CD-ROM
214 ;jnc SHORT _CreateBiosTablesForCDROM
215
216 ;jmp short DetectDrives_DriveNotFound
217;;; fall-through instead of previous jmp instruction
218;--------------------------------------------------------------------
219; DetectDrives_DriveNotFound
220; Parameters:
221; Nothing
222; Returns:
223; CF: Set (from DetectPrint_NullTerminatedStringFromCSSIandSetCF)
224; Corrupts registers:
225; AX, SI
226;--------------------------------------------------------------------
227DetectDrives_DriveNotFound:
228 mov si, g_szNotFound
229 jmp DetectPrint_NullTerminatedStringFromCSSIandSetCF
230
231
232;--------------------------------------------------------------------
233; CreateBiosTablesForHardDisk
234; Parameters:
235; BH: Drive Select byte for Drive and Head Register
236; DX: Autodetected port (for devices that support autodetection)
237; CS:BP: Ptr to IDEVARS for the drive
238; ES:SI Ptr to ATA information for the drive
239; DS: RAMVARS segment
240; ES: BDA segment
241; Returns:
242; Nothing
243; Corrupts registers:
244; AX, BX, CX, DX, SI, DI
245;--------------------------------------------------------------------
246CreateBiosTablesForHardDisk:
247 push bx
248 call AtaID_VerifyFromESSI
249 pop bx
250 jc SHORT DetectDrives_DriveNotFound
251 call CreateDPT_FromAtaInformation
252 jc SHORT DetectDrives_DriveNotFound
253 call DriveDetectInfo_CreateForHardDisk
254 jmp SHORT DetectPrint_DriveNameFromDrvDetectInfoInESBX
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