source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm@ 582

Last change on this file since 582 was 568, checked in by krille_n_@…, 10 years ago

Changes:

  • SerDrive: Using named pipe mode (serdrive -p) now works under Windows XP/2000/Server 2003.
  • checksum.pl: Added a compatibility fix for 3Com 3C503 cards.
  • XTIDECFG will now scan every possible segment address to find and load the BIOS and/or its settings from EEPROM. This should simplify things for people using combined option ROMs.
  • Fixed a bug from r521 in BootSector.asm where the BIOS would not display a timeout error if it failed to load the boot sector from harddrive.
  • Fixed a bug from r541 in CompatibleDPT.asm where CompatibleDPT_CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI would generate an invalid checksum in the DPTE.
  • Optimizations and other fixes.
File size: 9.7 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Functions for creating Disk Parameter Table.
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; Creates new Disk Parameter Table for detected hard disk.
25; Drive is then fully accessible using any BIOS function.
26;
27; CreateDPT_FromAtaInformation
28; Parameters:
29; BH: Drive Select byte for Drive and Head Register
30; DX: Autodetected port (for devices that support autodetection)
31; ES:SI: Ptr to 512-byte ATA information read from the drive
32; CS:BP: Ptr to IDEVARS for the controller
33; DS: RAMVARS segment
34; ES: BDA Segment
35; Returns:
36; DS:DI: Ptr to Disk Parameter Table
37; CF: Cleared
38; Corrupts registers:
39; AX, BX, CX, DX
40;--------------------------------------------------------------------
41CreateDPT_FromAtaInformation:
42 call FindDPT_ForNewDriveToDSDI
43 ; Fall to .InitializeDPT
44
45;--------------------------------------------------------------------
46; .InitializeDPT
47; Parameters:
48; BH: Drive Select byte for Drive and Head Register
49; DX: Autodetected port (for devices that support autodetection)
50; DS:DI: Ptr to Disk Parameter Table
51; CS:BP: Ptr to IDEVARS for the controller
52; Returns:
53; Nothing
54; Corrupts registers:
55; AX
56;--------------------------------------------------------------------
57.InitializeDPT:
58 call CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
59 ; Fall to .StoreDriveSelectAndDriveControlByte
60
61;--------------------------------------------------------------------
62; .StoreDriveSelectAndDriveControlByte
63; Parameters:
64; BH: Drive Select byte for Drive and Head Register
65; DS:DI: Ptr to Disk Parameter Table
66; ES:SI: Ptr to 512-byte ATA information read from the drive
67; CS:BP: Ptr to IDEVARS for the controller
68; Returns:
69; Nothing
70; Corrupts registers:
71; AX
72;--------------------------------------------------------------------
73.StoreDriveSelectAndDriveControlByte:
74 mov al, bh
75 and ax, BYTE FLG_DRVNHEAD_DRV ; AL now has Master/Slave bit
76%ifdef MODULE_IRQ
77 cmp [cs:bp+IDEVARS.bIRQ], ah ; Interrupts enabled?
78 jz SHORT .StoreFlags ; If not, do not set interrupt flag
79 or al, FLGL_DPT_ENABLE_IRQ
80.StoreFlags:
81%endif
82 mov [di+DPT.wFlags], ax
83 ; Fall to .StoreCHSparametersAndAddressingMode
84
85;--------------------------------------------------------------------
86; .StoreCHSparametersAndAddressingMode
87; Parameters:
88; DS:DI: Ptr to Disk Parameter Table
89; ES:SI: Ptr to 512-byte ATA information read from the drive
90; CS:BP: Ptr to IDEVARS for the controller
91; Returns:
92; Nothing
93; Corrupts registers:
94; AX, BX, CX, DX
95;--------------------------------------------------------------------
96.StoreCHSparametersAndAddressingMode:
97 ; Apply any user limited values to ATA ID
98 call AtaID_ModifyESSIforUserDefinedLimitsAndReturnTranslateModeInDX
99
100 ; Translate P-CHS to L-CHS
101 call AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIwithTranslateModeInDX
102 mov [di+DPT.wLchsCylinders], ax
103 mov [di+DPT.wLchsHeadsAndSectors], bx
104 mov al, dl
105 eSHL_IM al, TRANSLATEMODE_FIELD_POSITION
106 or cl, al
107
108 ; Store P-CHS and flags
109 call AtaGeometry_GetPCHStoAXBLBHfromAtaInfoInESSI
110 dec dl ; Set ZF if TRANSLATEMODE_LARGE, SF if TRANSLATEMODE_NORMAL
111 jle SHORT .JumpOverSetBitForAssistedLBA
112
113 ; Set LBA bit for Assisted LBA
114 or cl, FLGL_DPT_LBA
115.JumpOverSetBitForAssistedLBA:
116 jnz SHORT .NothingToChange
117
118 ; We cannot have 16 P-Heads heads in Revised ECHS mode (8193 or more cylinders)
119 ; but 16 heads are allowed when there are 8192 or less cylinders (ECHS).
120 ; Both of these are LARGE modes so do not confuse with NORMAL mode.
121 call AtaGeometry_IsDriveSmallEnoughForECHS
122 adc bx, -1 ; Adjust 16 P-Heads to 15 if needed
123
124.NothingToChange:
125 or [di+DPT.bFlagsLow], cl ; Shift count and addressing mode
126 mov [di+DPT.wPchsHeadsAndSectors], bx
127%ifdef MODULE_COMPATIBLE_TABLES OR MODULE_EBIOS
128 ; Store P-Cylinders here for Compatible DPTs when FLGL_DPT_LBA is not set
129 ; or when drive has over 15,482,880 sectors
130 mov [di+DPT.wPchsCylinders], ax
131%endif
132
133%ifdef MODULE_EBIOS
134 test cl, FLGL_DPT_LBA
135 jz SHORT .NoLbaSoNoEBIOS
136
137 ; Store P-Cylinders but only if we have 15,482,880 or less sectors since
138 ; we only need P-Cylinders so we can return it from AH=48h
139 call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
140 sub ax, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) & 0FFFFh
141 sbb dx, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) >> 16
142 sbb bx, BYTE 0
143 jnc SHORT .StoreNumberOfLbaSectors
144
145 ; Since we might have altered the default P-CHS parameters to be
146 ; presented to the drive (AH=09h), we need to calculate new
147 ; P-Cylinders. It could be read from the ATA ID after
148 ; COMMAND_INITIALIZE_DEVICE_PARAMETERS but that is too much trouble.
149 ; P-Cyls = MIN(16383*16*63, LBA sector count) / (P-Heads * P-Sectors per track)
150 call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
151 xchg cx, ax ; Sector count to DX:CX
152 mov al, [di+DPT.bPchsHeads]
153 mul BYTE [di+DPT.bPchsSectorsPerTrack]
154 xchg cx, ax
155 div cx ; AX = new P-Cylinders
156
157 ; We could remove wPchsCylinders from DPT if we calculate it on AH=48h
158 ; (and for compatible DPTs) but that would require extra code so we save ROM space instead.
159 mov [di+DPT.wPchsCylinders], ax
160
161 ; Store CHS sector count as total sector count. We must not use
162 ; LBA sector count if it is 15,482,880 or less.
163 mul cx
164 xor bx, bx
165 jmp SHORT .StoreTotalSectorsFromBXDXAX
166
167
168;--------------------------------------------------------------------
169; .StoreNumberOfLbaSectors
170; Parameters:
171; DS:DI: Ptr to Disk Parameter Table
172; ES:SI: Ptr to 512-byte ATA information read from the drive
173; CS:BP: Ptr to IDEVARS for the controller
174; Returns:
175; Nothing
176; Corrupts registers:
177; AX, BX, CX, DX
178;--------------------------------------------------------------------
179.StoreNumberOfLbaSectors:
180 ; Store LBA 28/48 total sector count
181 call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
182 or [di+DPT.bFlagsLow], cl ; LBA48 flag
183.StoreTotalSectorsFromBXDXAX:
184 mov [di+DPT.twLbaSectors], ax
185 mov [di+DPT.twLbaSectors+2], dx
186 mov [di+DPT.twLbaSectors+4], bx
187.NoLbaSoNoEBIOS:
188%endif ; MODULE_EBIOS
189 ; Fall to .StoreDeviceSpecificParameters
190
191;--------------------------------------------------------------------
192; .StoreDeviceSpecificParameters
193; Parameters:
194; DS:DI: Ptr to Disk Parameter Table
195; ES:SI: Ptr to 512-byte ATA information read from the drive
196; CS:BP: Ptr to IDEVARS for the controller
197; Returns:
198; Nothing
199; Corrupts registers:
200; AX, BX, CX, DX
201;--------------------------------------------------------------------
202.StoreDeviceSpecificParameters:
203 call Device_FinalizeDPT
204
205;----------------------------------------------------------------------
206; Update drive counts (hard and floppy)
207;----------------------------------------------------------------------
208%ifdef MODULE_SERIAL
209; Device_FinalizeDPT returns with CF set only when a floppy was found which can't happen without MODULE_SERIAL
210%ifdef MODULE_SERIAL_FLOPPY
211;
212; These two instructions serve two purposes:
213; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter.
214; 2. If this is a hard disk, and there have been any floppy drives previously added, then the hard disk is
215; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below).
216; Since the floppy DPT's come after the hard disk DPT's, without expensive (code size) code to relocate a DPT,
217; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons:
218; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list
219; B. the auto serial code is always executed last
220; C. the serial server always returns floppy drives last
221;
222 adc byte [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0
223 jnz .AllDone
224%else ; ~MODULE_SERIAL_FLOPPY
225;
226; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which
227; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that
228; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan.
229;
230 jc .AllDone
231%endif ; MODULE_SERIAL_FLOPPY
232%endif ; MODULE_SERIAL
233
234 inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS
235
236%ifdef MODULE_SERIAL
237.AllDone:
238 clc
239%endif
240
241 ret
242
243
244;--------------------------------------------------------------------
245; CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
246; Parameters:
247; DX: Autodetected port (for devices that support autodetection)
248; DS:DI: Ptr to Disk Parameter Table
249; CS:BP: Ptr to IDEVARS for the controller
250; Returns:
251; Nothing
252; Corrupts registers:
253; AX
254;--------------------------------------------------------------------
255CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI:
256 mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM
257 mov ax, [cs:bp+IDEVARS.wBasePort]
258 mov [di+DPT.wBasePort], ax
259 ret
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