source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm@ 491

Last change on this file since 491 was 491, checked in by krille_n_@…, 12 years ago

Changes:

  • Added a new define (USE_UNDOC_INTEL) that enables optimizations possible by using undocumented instructions available on all Intel processors and truly compatible clones. AFAIK the only exceptions are the NEC V-series and the Sony CXQ70108 processors so this option should be safe for use on the AT builds.
  • Building BIOSDRVS or the BIOS without MODULE_STRINGS_COMPRESSED would fail due to the recent code exclusions so I changed them a bit. Also fixed the mistaken change to Main.asm
  • Changed the Tandy specific info in Configuration_FullMode.txt so it matches the info in the Wiki.
  • Optimizations and fixes in general.
File size: 9.7 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, 2011-2012 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
65 jnc .AddHardDisks
66
67 mov bp, ROMVARS.ideVarsSerialAuto ; Point to our special IDEVARS structure, just for serial scans
68
69 mov al,[cs:ROMVARS.wFlags] ; Configurator set to always scan?
70 or al,[es:BDA.bKBFlgs1] ; Or, did the user hold down the ALT key?
71 and al,8 ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_ALWAYSDETECT
72 jnz .DriveDetectLoop
73%endif
74
75.AddHardDisks:
76;----------------------------------------------------------------------
77;
78; Add in hard disks to BDA, finalize our Count and First variables
79;
80; Note that we perform the add to bHDCount and store bFirstDrv even if the count is zero.
81; This is done because we use the value of .bFirstDrv to know how many drives were in the system
82; at the time of boot, and to return that number on int13h/8h calls. Because the count is zero,
83; FindDPT_ForDriveNumber will not find any drives that are ours.
84;
85 mov cx, [RAMVARS.wDrvCntAndFlopCnt] ; Our count of hard disks
86
87 mov al, [es:BDA.bHDCount]
88 add cl, al ; Add our drives to the system count
89 mov [es:BDA.bHDCount], cl
90 or al, 80h ; Or in hard disk flag
91 mov [RAMVARS.bFirstDrv], al ; Store first drive number
92
93.AddFloppies:
94%ifdef MODULE_SERIAL_FLOPPY
95;----------------------------------------------------------------------
96;
97; Add in any emulated serial floppy drives, finalize our packed Count and First variables
98;
99 dec ch
100 mov al, ch
101 js .NoFloppies ; if no drives are present, we store 0ffh
102
103 call FloppyDrive_GetCountFromBIOS_or_BDA
104
105 push ax
106
107 add al, ch ; Add our drives to existing drive count
108 cmp al, 3 ; For BDA, max out at 4 drives (ours is zero based)
109 jb .MaxBDAFloppiesExceeded
110 mov al, 3
111.MaxBDAFloppiesExceeded:
112 eROR_IM al, 2 ; move to bits 6-7
113 inc ax ; low order bit, indicating floppy drive exists
114
115 mov ah, [es:BDA.wEquipment] ; Load Equipment WORD low byte
116 and ah, 03eh ; Mask off drive number and drives present bit
117 or al, ah ; Or in new values
118 mov [es:BDA.wEquipment], al ; and store
119
120 mov al, 1eh ; BDA pointer to Floppy DPT
121 mov si, AH8h_FloppyDPT
122 call Interrupts_InstallHandlerToVectorInALFromCSSI
123
124 pop ax
125
126 shr ch, 1 ; number of drives, 1 or 2 only, to CF flag (clear=1, set=2)
127 rcl al, 1 ; starting drive number in upper 7 bits, number of drives in low bit
128.NoFloppies:
129 mov [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], al
130%endif
131
132 ret
133
134%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
135 %if FLG_ROMVARS_SERIAL_SCANDETECT != 8
136 %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."
137 %endif
138%endif
139
140
141;--------------------------------------------------------------------
142; StartDetectionWithDriveSelectByteInBHandStringInCX
143; Parameters:
144; BH: Drive Select byte for Drive and Head Register
145; CX: Offset to "Master" or "Slave" string
146; CS:BP: Ptr to IDEVARS for the drive
147; DS: RAMVARS segment
148; ES: Zero (BDA segment)
149; Returns:
150; None
151; Corrupts registers:
152; AX, BL, CX, DX, SI, DI
153;--------------------------------------------------------------------
154StartDetectionWithDriveSelectByteInBHandStringInCX:
155%ifdef MODULE_8BIT_IDE
156 ; Autodetect port for XT-CF
157 call DetectDrives_DoesIdevarsInCSBPbelongToXTCF
158 jne SHORT .SkipXTCFportDetection
159
160 ; XT-CF do not support slave drives so skip detection
161 test bh, FLG_DRVNHEAD_DRV
162 jnz SHORT NoSlaveDriveAvailable
163
164 ; XT-CF do not support slave drives so we can safely update port
165 ; for next drive (another XT-CF card on same system)
166.DetectNextPort:
167 mov dx, [es:BOOTVARS.wNextXTCFportToScan]
168 xor dl, 40h
169 jnz SHORT .StoreNextXTCFportToScan
170 inc dh
171 cmp dh, XTCF_BASE_PORT_4 >> 8
172 ja SHORT .SkipXTCFportDetection ; XT-CF not found from any port
173.StoreNextXTCFportToScan:
174 mov [es:BOOTVARS.wNextXTCFportToScan], dx
175
176 call AH1Eh_DetectXTCFwithBasePortInDX
177 jc SHORT .DetectNextPort ; XT-CF not found from this port
178
179 ; We now have autodetected port in DX
180 push dx
181 xchg ax, dx ; Port to print in AX
182 call DetectPrint_StartDetectWithAutodetectedBasePortInAXandIdeVarsInCSBP
183 jmp SHORT .DriveDetectionStringPrintedOnScreen
184
185 ; Print detect string for devices that do not support autodetection
186.SkipXTCFportDetection:
187 push dx
188%endif ; MODULE_8BIT_IDE
189
190 call DetectPrint_StartDetectWithMasterOrSlaveStringInCXandIdeVarsInCSBP
191.DriveDetectionStringPrintedOnScreen:
192%ifdef MODULE_HOTKEYS
193 call HotkeyBar_UpdateDuringDriveDetection
194%endif
195%ifdef MODULE_8BIT_IDE
196 pop dx
197%endif
198 ; Fall to .ReadAtaInfoFromHardDisk
199
200
201;--------------------------------------------------------------------
202; .ReadAtaInfoFromHardDisk
203; Parameters:
204; BH: Drive Select byte for Drive and Head Register
205; DX: Autodetected port (for devices that support autodetection)
206; CS:BP: Ptr to IDEVARS for the drive
207; DS: RAMVARS segment
208; ES: Zero (BDA segment)
209; Returns:
210; CF: Cleared if ATA-information read successfully
211; Set if any error
212; Corrupts registers:
213; AX, BL, CX, DX, SI, DI
214;--------------------------------------------------------------------
215.ReadAtaInfoFromHardDisk:
216 mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location
217 push es
218 push si
219 push dx
220 push bx
221 call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH
222 pop bx
223 pop dx
224 pop si
225 pop es
226 jnc SHORT CreateBiosTablesForHardDisk
227 ; Fall to .ReadAtapiInfoFromDrive
228
229.ReadAtapiInfoFromDrive: ; Not yet implemented
230 ;call ReadAtapiInfoFromDrive ; Assume CD-ROM
231 ;jnc SHORT _CreateBiosTablesForCDROM
232
233 ;jmp short DetectDrives_DriveNotFound
234;;; fall-through instead of previous jmp instruction
235;--------------------------------------------------------------------
236; DetectDrives_DriveNotFound
237; Parameters:
238; Nothing
239; Returns:
240; CF: Set (from BootMenuPrint_NullTerminatedStringFromCSSIandSetCF)
241; Corrupts registers:
242; AX, SI
243;--------------------------------------------------------------------
244DetectDrives_DriveNotFound:
245 mov si, g_szNotFound
246 jmp DetectPrint_NullTerminatedStringFromCSSIandSetCF
247
248
249;--------------------------------------------------------------------
250; CreateBiosTablesForHardDisk
251; Parameters:
252; BH: Drive Select byte for Drive and Head Register
253; DX: Autodetected port (for devices that support autodetection)
254; CS:BP: Ptr to IDEVARS for the drive
255; ES:SI Ptr to ATA information for the drive
256; DS: RAMVARS segment
257; ES: BDA segment
258; Returns:
259; Nothing
260; Corrupts registers:
261; AX, BX, CX, DX, SI, DI
262;--------------------------------------------------------------------
263CreateBiosTablesForHardDisk:
264 push bx
265 call AtaID_VerifyFromESSI
266 pop bx
267 jc SHORT DetectDrives_DriveNotFound
268 call CreateDPT_FromAtaInformation
269 jc SHORT DetectDrives_DriveNotFound
270 call DriveDetectInfo_CreateForHardDisk
271 jmp SHORT DetectPrint_DriveNameFromDrvDetectInfoInESBX
272
273
274%ifdef MODULE_8BIT_IDE
275;--------------------------------------------------------------------
276; DetectDrives_DoesIdevarsInCSBPbelongToXTCF
277; Parameters:
278; CS:BP: Ptr to IDEVARS for the drive
279; Returns:
280; ZF: Set if IDEVARS belongs to XT-CF device
281; Cleared if some other device
282; Corrupts registers:
283; AL
284;--------------------------------------------------------------------
285DetectDrives_DoesIdevarsInCSBPbelongToXTCF:
286 mov al, [cs:bp+IDEVARS.bDevice]
287 cmp al, DEVICE_8BIT_XTCF_PIO8
288 je SHORT .DeviceIsXTCF
289 cmp al, DEVICE_8BIT_XTCF_DMA
290 je SHORT .DeviceIsXTCF
291 cmp al, DEVICE_8BIT_XTCF_MEMMAP
292.DeviceIsXTCF:
293NoSlaveDriveAvailable:
294 ret
295%endif ; MODULE_8BIT_IDE
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