source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm@ 442

Last change on this file since 442 was 441, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • ATA-ID sector is now verified (P-CHS verification for ATA-4 and older + checksum for ATA-5 and later)
File size: 7.7 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, BX, CX, DX, SI, DI
153;--------------------------------------------------------------------
154StartDetectionWithDriveSelectByteInBHandStringInCX:
155 call DetectPrint_StartDetectWithMasterOrSlaveStringInCXandIdeVarsInCSBP
156%ifdef MODULE_HOTKEYS
157 call HotkeyBar_UpdateDuringDriveDetection
158%endif
159 ; Fall to .ReadAtaInfoFromHardDisk
160
161;--------------------------------------------------------------------
162; .ReadAtaInfoFromHardDisk
163; Parameters:
164; BH: Drive Select byte for Drive and Head Register
165; CS:BP: Ptr to IDEVARS for the drive
166; DS: RAMVARS segment
167; ES: Zero (BDA segment)
168; Returns:
169; CF: Cleared if ATA-information read successfully
170; Set if any error
171; Corrupts registers:
172; AX, BL, CX, DX, SI, DI
173;--------------------------------------------------------------------
174.ReadAtaInfoFromHardDisk:
175 mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location
176 push es
177 push si
178 push bx
179 call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH
180 pop bx
181 pop si
182 pop es
183 jnc SHORT CreateBiosTablesForHardDisk
184 ; Fall to .ReadAtapiInfoFromDrive
185
186.ReadAtapiInfoFromDrive: ; Not yet implemented
187 ;call ReadAtapiInfoFromDrive ; Assume CD-ROM
188 ;jnc SHORT _CreateBiosTablesForCDROM
189
190 ;jmp short DetectDrives_DriveNotFound
191;;; fall-through instead of previous jmp instruction
192;--------------------------------------------------------------------
193; DetectDrives_DriveNotFound
194; Parameters:
195; Nothing
196; Returns:
197; CF: Set (from BootMenuPrint_NullTerminatedStringFromCSSIandSetCF)
198; Corrupts registers:
199; AX, SI
200;--------------------------------------------------------------------
201DetectDrives_DriveNotFound:
202 mov si, g_szNotFound
203 jmp DetectPrint_NullTerminatedStringFromCSSIandSetCF
204
205
206;--------------------------------------------------------------------
207; CreateBiosTablesForHardDisk
208; Parameters:
209; BH: Drive Select byte for Drive and Head Register
210; CS:BP: Ptr to IDEVARS for the drive
211; ES:SI Ptr to ATA information for the drive
212; DS: RAMVARS segment
213; ES: BDA segment
214; Returns:
215; Nothing
216; Corrupts registers:
217; AX, BX, CX, DX, SI, DI
218;--------------------------------------------------------------------
219CreateBiosTablesForHardDisk:
220 push bx
221 call AtaID_VerifyFromESSI
222 pop bx
223 jc SHORT DetectDrives_DriveNotFound
224 call CreateDPT_FromAtaInformation
225 jc SHORT DetectDrives_DriveNotFound
226 call DriveDetectInfo_CreateForHardDisk
227 jmp SHORT DetectPrint_DriveNameFromDrvDetectInfoInESBX
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