source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm@ 533

Last change on this file since 533 was 533, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • P-Cylinders returned by AH=48h are now calculated from L-CHS capacity when RESERVE_DIAGNOSTIC_CYLINDER is defined.
  • Total sector count returned by AH=48h is now always P-Cylinders * P-Heads * P-Sectors per track for drives with less than or equal 15,482,880 LBA sectors.
File size: 11.9 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 (if successful)
37; CF: Cleared if DPT created successfully
38; Set if any error
39; Corrupts registers:
40; AX, BX, CX, DH
41;--------------------------------------------------------------------
42CreateDPT_FromAtaInformation:
43 call FindDPT_ForNewDriveToDSDI
44 ; Fall to .InitializeDPT
45
46;--------------------------------------------------------------------
47; .InitializeDPT
48; Parameters:
49; BH: Drive Select byte for Drive and Head Register
50; DX: Autodetected port (for devices that support autodetection)
51; DS:DI: Ptr to Disk Parameter Table
52; CS:BP: Ptr to IDEVARS for the controller
53; Returns:
54; Nothing
55; Corrupts registers:
56; AX
57;--------------------------------------------------------------------
58.InitializeDPT:
59 call CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
60 ; Fall to .StoreDriveSelectAndDriveControlByte
61
62;--------------------------------------------------------------------
63; .StoreDriveSelectAndDriveControlByte
64; Parameters:
65; BH: Drive Select byte for Drive and Head Register
66; DS:DI: Ptr to Disk Parameter Table
67; ES:SI: Ptr to 512-byte ATA information read from the drive
68; CS:BP: Ptr to IDEVARS for the controller
69; Returns:
70; Nothing
71; Corrupts registers:
72; AX
73;--------------------------------------------------------------------
74.StoreDriveSelectAndDriveControlByte:
75 mov al, bh
76 and ax, BYTE FLG_DRVNHEAD_DRV ; AL now has Master/Slave bit
77%ifdef MODULE_IRQ
78 cmp [cs:bp+IDEVARS.bIRQ], ah ; Interrupts enabled?
79 jz SHORT .StoreFlags ; If not, do not set interrupt flag
80 or al, FLGL_DPT_ENABLE_IRQ
81.StoreFlags:
82%endif
83 mov [di+DPT.wFlags], ax
84 ; Fall to .StoreCHSparametersAndAddressingMode
85
86;--------------------------------------------------------------------
87; .StoreCHSparametersAndAddressingMode
88; Parameters:
89; DS:DI: Ptr to Disk Parameter Table
90; ES:SI: Ptr to 512-byte ATA information read from the drive
91; CS:BP: Ptr to IDEVARS for the controller
92; Returns:
93; Nothing
94; Corrupts registers:
95; AX, BX, CX, DX
96;--------------------------------------------------------------------
97.StoreCHSparametersAndAddressingMode:
98 ; Check if CHS defined in ROMVARS
99 call GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
100 test cl, FLG_DRVPARAMS_USERCHS
101 jz SHORT .AutodetectPCHSvalues
102
103 ; Translate P-CHS to L-CHS
104 call AtaGeometry_GetLCHStoAXBLBHfromPCHSinAXBLBHandTranslateModeInDX
105 jmp SHORT .StoreLCHStoDPT
106.AutodetectPCHSvalues:
107 call AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIandTranslateModeInDX
108
109.StoreLCHStoDPT:
110 eSHL_IM dl, TRANSLATEMODE_FIELD_POSITION
111 or cl, dl
112 or [di+DPT.bFlagsLow], cl ; Shift count and addressing mode
113 mov [di+DPT.wLchsCylinders], ax
114 mov [di+DPT.wLchsHeadsAndSectors], bx
115
116 ; Store P-CHS to DPT
117 call AtaGeometry_GetPCHStoAXBLBHfromAtaInfoInESSI
118 mov [di+DPT.bPchsHeads], bl
119%ifdef MODULE_EBIOS
120 mov [di+DPT.bPchsSectorsPerTrack], bh
121
122%ifdef RESERVE_DIAGNOSTIC_CYLINDER
123 ; Do not store P-Cylinders, instead calculate it from L-CHS total sector count.
124 ; Read AH=48h_GetExtendedDriveParameters.asm for more info.
125 xchg ax, bx
126 mul ah
127 push ax ; P-Heads * P-Sectors per track
128 call AH15h_GetSectorCountToBXDXAX
129 pop bx
130 div bx ; AX = Calculated cylinders
131%endif ; RESERVE_DIAGNOSTIC_CYLINDER
132
133 mov [di+DPT.wPchsCylinders], ax
134 ; Fall to .StoreNumberOfLbaSectors
135
136;--------------------------------------------------------------------
137; .StoreNumberOfLbaSectors
138; Parameters:
139; DS:DI: Ptr to Disk Parameter Table
140; ES:SI: Ptr to 512-byte ATA information read from the drive
141; CS:BP: Ptr to IDEVARS for the controller
142; Returns:
143; Nothing
144; Corrupts registers:
145; AX, BX, CX, DX
146;--------------------------------------------------------------------
147 ; Check if LBA supported
148 test BYTE [es:si+ATA1.wCaps+1], A1_wCaps_LBA>>8
149 jz SHORT .NoLbaSupportedSoNoEBIOS
150
151 ; Store LBA 28/48 total sector count
152 call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
153 call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
154
155 ; If we have 15,482,880 or less sectors, we multiply P-CHS values
156 ; and use that as total sector count.
157 ; Read AH=48h_GetExtendedDriveParameters.asm for more info.
158 sub ax, 4001h
159 sbb dx, 0ECh
160 sbb bx, BYTE 0
161 jnc SHORT .NoNeedToUseCHSsectorCount ; More than EC4000h
162
163 mov al, [di+DPT.bPchsHeads]
164 mul BYTE [di+DPT.bPchsSectorsPerTrack]
165 mul WORD [di+DPT.wPchsCylinders]
166 xor bx, bx
167 call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
168
169 ; Load user defined LBA
170.NoNeedToUseCHSsectorCount:
171 call GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
172 test cl, FLG_DRVPARAMS_USERLBA
173 jz SHORT .KeepTotalSectorsFromAtaID
174
175 ; Compare user defined and ATA-ID sector count and select smaller
176 mov dx, bx
177 xor bx, bx ; User defined LBA now in BX:DX:AX
178 cmp bx, [di+DPT.twLbaSectors+4]
179 jb SHORT .StoreUserDefinedSectorCountToDPT
180 cmp dx, [di+DPT.twLbaSectors+2]
181 jb SHORT .StoreUserDefinedSectorCountToDPT
182 ja SHORT .KeepTotalSectorsFromAtaID
183 cmp ax, [di+DPT.twLbaSectors]
184 jae SHORT .KeepTotalSectorsFromAtaID
185.StoreUserDefinedSectorCountToDPT:
186 ; CL bit FLGL_DPT_LBA48 is clear at this point
187 call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
188
189.KeepTotalSectorsFromAtaID:
190.NoLbaSupportedSoNoEBIOS:
191%endif ; MODULE_EBIOS
192 ; Fall to .StoreBlockMode
193
194;--------------------------------------------------------------------
195; .StoreBlockMode
196; Parameters:
197; DS:DI: Ptr to Disk Parameter Table
198; ES:SI: Ptr to 512-byte ATA information read from the drive
199; CS:BP: Ptr to IDEVARS for the controller
200; Returns:
201; Nothing
202; Corrupts registers:
203; Nothing
204;--------------------------------------------------------------------
205.StoreBlockMode:
206 cmp BYTE [es:si+ATA1.bBlckSize], 1 ; Max block size in sectors
207 jbe SHORT .BlockModeTransfersNotSupported
208 or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED
209.BlockModeTransfersNotSupported:
210 ; Fall to .StoreDeviceSpecificParameters
211
212;--------------------------------------------------------------------
213; .StoreDeviceSpecificParameters
214; Parameters:
215; DS:DI: Ptr to Disk Parameter Table
216; ES:SI: Ptr to 512-byte ATA information read from the drive
217; CS:BP: Ptr to IDEVARS for the controller
218; Returns:
219; Nothing
220; Corrupts registers:
221; AX, BX, CX, DX
222;--------------------------------------------------------------------
223.StoreDeviceSpecificParameters:
224 call Device_FinalizeDPT
225
226;----------------------------------------------------------------------
227; Update drive counts (hard and floppy)
228;----------------------------------------------------------------------
229
230%ifdef MODULE_SERIAL_FLOPPY
231;
232; These two instructions serve two purposes:
233; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter.
234; 2. If this is a hard disk, and there have been any floppy drives previously added, then the hard disk is
235; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below).
236; Since the floppy DPT's come after the hard disk DPT's, without expensive (code size) code to relocate a DPT,
237; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons:
238; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list
239; B. the auto serial code is always executed last
240; C. the serial server always returns floppy drives last
241;
242 adc byte [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0
243 jnz .AllDone
244%else
245;
246; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which
247; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that
248; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan.
249;
250 jc .AllDone
251%endif
252
253 inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS
254
255.AllDone:
256 clc
257 ret
258
259
260;--------------------------------------------------------------------
261; CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
262; Parameters:
263; DX: Autodetected port (for devices that support autodetection)
264; DS:DI: Ptr to Disk Parameter Table
265; CS:BP: Ptr to IDEVARS for the controller
266; Returns:
267; Nothing
268; Corrupts registers:
269; AX
270;--------------------------------------------------------------------
271CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI:
272 mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM
273
274%ifdef MODULE_8BIT_IDE_ADVANCED
275 call DetectDrives_DoesIdevarsInCSBPbelongToXTCF
276 jne SHORT .DeviceUsesPortSpecifiedInIDEVARS
277 mov [di+DPT.wBasePort], dx
278 ret
279.DeviceUsesPortSpecifiedInIDEVARS:
280%endif ; MODULE_8BIT_IDE_ADVANCED
281
282 mov ax, [cs:bp+IDEVARS.wBasePort]
283 mov [di+DPT.wBasePort], ax
284 ret
285
286
287;--------------------------------------------------------------------
288; GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
289; Parameters:
290; DS:DI: Ptr to Disk Parameter Table
291; Returns:
292; AX: User defined P-CHS Cylinders or LBA low word
293; BX: User defined P-CHS Heads and Sectors or LBA high word
294; DX: Translate mode or TRANSLATEMODE_AUTO
295; CX: FLG_DRVPARAMS_USERCHS if user defined CHS in BX:AX
296; FLG_DRVPARAMS_USERLBA if user defined LBA in BX:AX
297; Zero if user has not defined capacity
298; Corrupts registers:
299; Nothing
300;--------------------------------------------------------------------
301GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS:
302 call AccessDPT_GetPointerToDRVPARAMStoCSBX
303
304 ; Get settings
305 mov cx, [cs:bx+DRVPARAMS.wFlags]
306 mov dx, cx
307 and cx, BYTE FLG_DRVPARAMS_USERCHS | FLG_DRVPARAMS_USERLBA
308 and dx, BYTE MASK_DRVPARAMS_TRANSLATEMODE
309 eSHR_IM dx, TRANSLATEMODE_FIELD_POSITION
310
311 ; Get capacity
312 mov ax, [cs:bx+DRVPARAMS.wCylinders] ; Or .dwMaximumLBA
313 mov bx, [cs:bx+DRVPARAMS.wHeadsAndSectors] ; Or .dwMaximumLBA+2
314 ret
315
316
317%ifdef MODULE_EBIOS
318;--------------------------------------------------------------------
319; StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
320; Parameters:
321; BX:DX:AX: Total Sector Count
322; CL: FLGL_DPT_LBA48 if LBA48 supported
323; DS:DI: Ptr to Disk Parameter Table
324; Returns:
325; Nothing
326; Corrupts registers:
327; CL
328;--------------------------------------------------------------------
329StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX:
330 or cl, FLGL_DPT_LBA_AND_EBIOS_SUPPORTED
331 and BYTE [di+DPT.bFlagsLow], ~FLGL_DPT_LBA48
332 or [di+DPT.bFlagsLow], cl
333 mov [di+DPT.twLbaSectors], ax
334 mov [di+DPT.twLbaSectors+2], dx
335 mov [di+DPT.twLbaSectors+4], bx
336 ret
337%endif ; MODULE_EBIOS
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