source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/FindDPT.asm@ 619

Last change on this file since 619 was 567, checked in by krille_n_@…, 10 years ago

Changes:

  • Renamed MODULE_FEATURE_SETS to MODULE_POWER_MANAGEMENT.
  • Renamed MODULE_VERY_LATE_INITIALIZATION to MODULE_VERY_LATE_INIT and removed it from the official builds.
  • Removed the code that skips detection of slave drives on XT-CF controllers since slave drives can be used with Lo-tech ISA CompactFlash boards.
  • Added autodetection of the SVC ADP50L controller to XTIDECFG.
  • The autodetection of XT-CF controllers now requires MODULE_8BIT_IDE_ADVANCED in the loaded BIOS.
  • Fixed a bug in XTIDECFG from r502 where the "Base (cmd block) address" menu option would be displayed when a serial device was selected as the IDE controller.
  • XTIDECFG would display the "Enable interrupt" menu option for the XTIDE r1 but not for the XTIDE r2. It's now displayed for both controller types.
  • Disabled the "Internal Write Cache" menu option in the Master/Slave Drive menus for serial device type drives.
  • Optimizations and other fixes.
File size: 9.4 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Functions for finding 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; Checks if drive is handled by this BIOS, and return DPT pointer.
25;
26; FindDPT_ForDriveNumberInDL
27; Parameters:
28; DL: Drive number
29; DS: RAMVARS segment
30; Returns:
31; CF: Cleared if drive is handled by this BIOS
32; Set if drive belongs to some other BIOS
33; DI: DPT Pointer if drive is handled by this BIOS
34; Zero if drive belongs to some other BIOS
35; Corrupts registers:
36; Nothing
37;--------------------------------------------------------------------
38ALIGN JUMP_ALIGN
39FindDPT_ForDriveNumberInDL:
40 xchg di, ax ; Save the contents of AX in DI
41
42;
43; Check Our Hard Disks
44;
45 mov ax, [RAMVARS.wFirstDrvAndCount] ; Drive count to AH, First number to AL
46 add ah, al ; One past last drive to AH
47
48%ifdef MODULE_SERIAL_FLOPPY
49 cmp dl, ah ; Above last supported?
50 jae SHORT .HardDiskNotHandledByThisBIOS
51
52 cmp dl, al ; Below first supported?
53 jae SHORT .CalcDPTForDriveNumber
54
55ALIGN JUMP_ALIGN
56.HardDiskNotHandledByThisBIOS:
57;
58; Check Our Floppy Disks
59;
60 call RamVars_UnpackFlopCntAndFirstToAL
61 js SHORT .DiskIsNotHandledByThisBIOS
62
63 cbw ; Always 0h (no floppy drive covered above)
64 adc ah, al ; Add in first drive number and number of drives
65
66 cmp ah, dl ; Check second drive if two, first drive if only one
67 jz SHORT .CalcDPTForDriveNumber
68 cmp al, dl ; Check first drive in all cases, redundant but OK to repeat
69 jnz SHORT .DiskIsNotHandledByThisBIOS
70%else
71 cmp dl, ah ; Above last supported?
72 jae SHORT .DiskIsNotHandledByThisBIOS
73
74 cmp dl, al ; Below first supported?
75 jb SHORT .DiskIsNotHandledByThisBIOS
76%endif
77 ; Fall to .CalcDPTForDriveNumber
78
79;--------------------------------------------------------------------
80; Finds Disk Parameter Table for drive number.
81; Not intended to be called except by FindDPT_ForDriveNumberInDL
82;
83; .CalcDPTForDriveNumber
84; Parameters:
85; DL: Drive number
86; DS: RAMVARS segment
87; DI: Saved copy of AX from entry at FindDPT_ForDriveNumberInDL
88; Returns:
89; DS:DI: Ptr to DPT
90; CF: Clear
91; Corrupts registers:
92; Nothing
93;--------------------------------------------------------------------
94ALIGN JUMP_ALIGN
95.CalcDPTForDriveNumber:
96 push dx
97
98%ifdef MODULE_SERIAL_FLOPPY
99 mov ax, [RAMVARS.wFirstDrvAndCount]
100
101 test dl, dl
102 js .harddisk
103
104 call RamVars_UnpackFlopCntAndFirstToAL
105 add dl, ah ; add in end of hard disk DPT list, floppies start immediately after
106
107ALIGN JUMP_ALIGN
108.harddisk:
109 sub dl, al ; subtract off beginning of either hard disk or floppy list (as appropriate)
110%else
111 sub dl, [RAMVARS.bFirstDrv] ; subtract off beginning of hard disk list
112%endif
113
114.CalcDPTForNewDrive:
115 mov al, LARGEST_DPT_SIZE
116
117 mul dl
118 add ax, RAMVARS_size ; Clears CF (will not overflow)
119
120 pop dx
121
122 xchg di, ax ; Restore AX from entry at FindDPT_ForDriveNumber, put DPT pointer in DI
123 ret
124
125ALIGN JUMP_ALIGN
126.DiskIsNotHandledByThisBIOS:
127;
128; Drive not found...
129;
130 xor ax, ax ; Clear DPT pointer
131 stc ; Is not supported by our BIOS
132
133 xchg di, ax ; Restore AX from save at top
134 ret
135
136
137;--------------------------------------------------------------------
138; Iteration routines for FindDPT_MasterOrSingleForIdevarsOffsetInDL and
139; FindDPT_SlaveForIdevarsOffsetInDL, for use with IterateAllDPTs
140;
141; Returns when DPT is found on the controller with Idevars offset in DL
142;
143; IterateFindSecondDPTforIdevars
144; IterateFindFirstDPTforIdevars
145; DL: Offset to IDEVARS to search from DPTs
146; SI: Offset to this callback function
147; DS:DI: Ptr to DPT to examine
148; Returns:
149; CF: Cleared if wanted DPT found
150; Set if wrong DPT
151;--------------------------------------------------------------------
152IterateFindSecondDPTforIdevars:
153 call IterateFindFirstDPTforIdevars
154 jc SHORT .WrongController
155 mov si, IterateFindFirstDPTforIdevars
156.WrongController:
157 stc
158 ret
159
160IterateFindFirstDPTforIdevars:
161 cmp dl, [di+DPT.bIdevarsOffset] ; Clears CF if matched
162 je .Done
163 stc ; Set CF for not found
164.Done:
165 ret
166
167
168;--------------------------------------------------------------------
169; Finds pointer to first unused Disk Parameter Table.
170; Should only be used before DetectDrives is complete (not valid after this time).
171;
172; FindDPT_ForNewDriveToDSDI
173; Parameters:
174; DS: RAMVARS segment
175; Returns:
176; DS:DI: Ptr to first unused DPT
177; Corrupts registers:
178; AX
179;--------------------------------------------------------------------
180ALIGN JUMP_ALIGN
181FindDPT_ForNewDriveToDSDI:
182 push dx
183
184%ifdef MODULE_SERIAL_FLOPPY
185 mov dx, [RAMVARS.wDrvCntAndFlopCnt]
186 add dl, dh
187%else
188 mov dl, [RAMVARS.bDrvCnt]
189%endif
190
191 jmp SHORT FindDPT_ForDriveNumberInDL.CalcDPTForNewDrive
192
193;--------------------------------------------------------------------
194; IterateToDptWithFlagsHighInBL
195; Parameters:
196; DS:DI: Ptr to DPT to examine
197; BL: Bit(s) to test in DPT.bFlagsHigh
198; Returns:
199; CF: Cleared if wanted DPT found
200; Set if wrong DPT
201; Corrupts registers:
202; Nothing
203;--------------------------------------------------------------------
204%ifdef MODULE_SERIAL
205ALIGN JUMP_ALIGN
206IterateToDptWithFlagsHighInBL:
207 test [di+DPT.bFlagsHigh], bl ; Clears CF
208 jnz SHORT .ReturnRightDPT
209 stc
210.ReturnRightDPT:
211 ret
212%endif
213
214;--------------------------------------------------------------------
215; FindDPT_ToDSDIforSerialDevice
216; Parameters:
217; DS: RAMVARS segment
218; Returns:
219; DS:DI: Ptr to DPT
220; CF: Cleared if wanted DPT found
221; Set if DPT not found, or no DPTs present
222; Corrupts registers:
223; SI
224;--------------------------------------------------------------------
225%ifdef MODULE_SERIAL
226ALIGN JUMP_ALIGN
227FindDPT_ToDSDIforSerialDevice:
228 mov bl, FLGH_DPT_SERIAL_DEVICE
229 ; Fall to FindDPT_ToDSDIforFlagsHighInBL
230%endif
231
232;--------------------------------------------------------------------
233; FindDPT_ToDSDIforFlagsHighInBL
234; Parameters:
235; DS: RAMVARS segment
236; BL: Bit(s) to test in DPT.bFlagsHigh
237; Returns:
238; DS:DI: Ptr to DPT
239; CF: Cleared if wanted DPT found
240; Set if DPT not found, or no DPTs present
241; Corrupts registers:
242; SI
243;--------------------------------------------------------------------
244%ifdef MODULE_SERIAL
245;%ifdef MODULE_IRQ
246;ALIGN JUMP_ALIGN
247;FindDPT_ToDSDIforFlagsHighInBL: ; This label is unused
248;%endif
249 mov si, IterateToDptWithFlagsHighInBL
250 jmp SHORT FindDPT_IterateAllDPTs
251%endif
252
253;--------------------------------------------------------------------
254; FindDPT_MasterOrSingleForIdevarsOffsetInDL
255; Parameters:
256; DL: Offset to IDEVARS to search for
257; DS: RAMVARS segment
258; Returns:
259; DS:DI: Ptr to first DPT with same IDEVARS as in DL
260; CF: Cleared if wanted DPT found
261; Set if DPT not found, or no DPTs present
262; Corrupts registers:
263; SI
264;--------------------------------------------------------------------
265FindDPT_MasterOrSingleForIdevarsOffsetInDL:
266 mov si, IterateFindFirstDPTforIdevars
267 jmp SHORT FindDPT_IterateAllDPTs
268
269;--------------------------------------------------------------------
270; FindDPT_SlaveForIdevarsOffsetInDL
271; Parameters:
272; DL: Offset to IDEVARS to search for
273; DS: RAMVARS segment
274; Returns:
275; DS:DI: Ptr to second DPT with same IDEVARS as in DL
276; CF: Cleared if wanted DPT found
277; Set if DPT not found, or no DPTs present
278; Corrupts registers:
279; SI
280;--------------------------------------------------------------------
281FindDPT_SlaveForIdevarsOffsetInDL:
282 mov si, IterateFindSecondDPTforIdevars
283 ; Fall to FindDPT_IterateAllDPTs
284
285;--------------------------------------------------------------------
286; Iterates all Disk Parameter Tables.
287;
288; FindDPT_IterateAllDPTs
289; Parameters:
290; AX,BX,DX: Parameters to callback function
291; CS:SI: Ptr to callback function
292; Callback routine should return CF=clear if found
293; DS: RAMVARS segment
294; Returns:
295; DS:DI: Ptr to wanted DPT (if found)
296; If not found, points to first empty DPT
297; CF: Cleared if wanted DPT found
298; Set if DPT not found, or no DPTs present
299; Corrupts registers:
300; Nothing unless corrupted by callback function
301;--------------------------------------------------------------------
302ALIGN JUMP_ALIGN
303FindDPT_IterateAllDPTs:
304 push cx
305
306 mov di, RAMVARS_size ; Point DS:DI to first DPT
307 eMOVZX cx, [RAMVARS.bDrvCnt]
308 jcxz .NotFound ; Return if no drives
309
310ALIGN JUMP_ALIGN
311.LoopWhileDPTsLeft:
312 call si ; Is wanted DPT?
313 jnc SHORT .Found ; If so, return
314 add di, BYTE LARGEST_DPT_SIZE ; Point to next DPT
315 loop .LoopWhileDPTsLeft
316
317ALIGN JUMP_ALIGN
318.NotFound:
319 stc
320
321ALIGN JUMP_ALIGN
322.Found:
323 pop cx
324 ret
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