source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm@ 629

Last change on this file since 629 was 580, checked in by krille_n_@…, 10 years ago

Changes:

  • XTIDECFG: Fixed a bug from r459 where the menu option for selection of default boot drive would be missing if the BIOS had been built without MODULE_HOTKEYS. The menu option is now visible if either or both of MODULE_HOTKEYS and MODULE_BOOT_MENU is available.
  • BIOS: Disabled ATA-ID validation by adding a new define (NO_ATAID_VALIDATION) and making it the default for all builds since at least two WD Caviar drive models are incompatible with it.
  • Fixed the "No Fixed Disk Present in FDISK"-bug introduced in r551 which means the Tiny build now works without including MODULE_DRIVEXLATE.
  • Fixed a bug from r528 where pressing hotkey F6 would not initiate detection of serial drives.
  • Fixed a bug from r186 in DisplayFormatCompressed.asm where the boot menu would print the IRQ in hexadecimal format when it should be in decimal format.
  • Optimizations and fixes.
File size: 6.4 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Int 13h function AH=48h, Get Extended Drive Parameters.
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; Int 13h function AH=48h, Get Extended Drive Parameters.
25;
26; It is not completely clear what this function should return as total sector count in some cases.
27; What is certain is that:
28; A) Phoenix Enhanced Disk Drive Specification v3.0 says that P-CHS values
29; are never returned for drives with more than 15,482,880 sectors (16384*15*63).
30; For those drives we can simply return total sector count from
31; ATA ID WORDs 60 and 61 (LBA28) or WORDs 100-103 (LBA48).
32; B) IBM PC DOS 7.1 fdisk32 displays warning message if P-CHS values multiplied
33; together are different than total sector count. Therefore for drives with less
34; than or equal 15,482,880 sectors we MUST NOT return total sector count from
35; ATA ID WORDs 60 and 61.
36;
37; Lets take an example. 6 GB Hitachi microdrive reports following values in ATA ID:
38; Sector count from WORDs 60 and 61 : 12,000,556
39; Cylinders : 11905
40; Heads : 16
41; Sectors per track : 63
42;
43; When multiplying C*H*S we get : 12,000,240
44; So the CHS size is a little bit less than LBA size. But we must use
45; the smaller value since C*H*S must equal total sector count!
46;
47; Now we get to the uncertain area where I could not find any information.
48; Award BIOS from 1997 Pentium motherboard returns following values:
49; AH=08h L-CHS: 745, 255, 63 (exactly the same as what we return)
50; => Total Sector Count: 745*255*63 = 11,968,425
51; AH=48h P-CHS: 11873, 16, 63
52; AH=48h Total Sector Count: 11873* 16*63 = 11,967,984
53;
54; Notice how AH=48h returns lesser total sector count than AH=08h! The only
55; way I could think of to get 11873 cylinders is to divide AH=08h sector
56; count with P-CHS heads and sectors: (745*255*63) / (16*63) = 11873
57;
58; The only reason I can think of is that the Award BIOS has a bug and
59; uses L-CHS when it should use P-CHS values in the calculation.
60;
61;
62; AH48h_GetExtendedDriveParameters
63; Parameters:
64; SI: Same as in INTPACK
65; DL: Translated Drive number
66; DS:DI: Ptr to DPT (in RAMVARS segment)
67; SS:BP: Ptr to IDEPACK
68; Parameters on INTPACK:
69; DS:SI: Ptr to Extended Drive Information Table to fill
70; Returns with INTPACK:
71; AH: Int 13h return status
72; DS:SI: Ptr to Extended Drive Information Table
73; CF: 0 if successful, 1 if error
74;--------------------------------------------------------------------
75AH48h_HandlerForGetExtendedDriveParameters:
76 mov si, di
77 push ds
78 pop es ; ES = RAMVARS segment
79 xor bx, bx
80 dec bx ; Set to FFFFh to assume we do not return DPTE
81
82 ; Create DPTE (hardware information for device drivers)
83%ifdef MODULE_COMPATIBLE_TABLES
84 call AH41h_GetSupportBitsToCX
85 test cl, ENHANCED_DISK_DRIVE_SUPPORT
86 jz SHORT .DoNotCreateDPTE
87 call CompatibleDPT_CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI
88.DoNotCreateDPTE:
89%endif ; MODULE_COMPATIBLE_TABLES
90
91 ; Point DS:DI to Extended Drive Information Table to fill
92 mov di, [bp+IDEPACK.intpack+INTPACK.si]
93 mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
94
95 ; Check and adjust Extended Drive Information Table size
96 ; to MINIMUM_EDRIVEINFO_SIZE or EDRIVEINFO_SIZE_WITH_DPTE
97 mov ax, MINIMUM_EDRIVEINFO_SIZE
98 mov cx, [di+EDRIVE_INFO.wSize]
99 cmp cx, ax
100 jb Prepare_ReturnFromInt13hWithInvalidFunctionError
101 mov [di+EDRIVE_INFO.wSize], ax
102 mov al, EDRIVEINFO_SIZE_WITH_DPTE
103 cmp cx, ax
104 jb SHORT .SkipEddConfigurationParameters
105 mov [di+EDRIVE_INFO.wSize], al
106
107 ; Store DPTE for standard controllers only,
108 ; FFFF:FFFF for non standard controllers
109%ifdef MODULE_COMPATIBLE_TABLES
110 mov [di+EDRIVE_INFO.fpDPTE], bx
111 mov [di+EDRIVE_INFO.fpDPTE+2], es
112 inc bx
113 jnz SHORT .SkipEddConfigurationParameters ; Already stored
114 dec bx
115 mov [di+EDRIVE_INFO.fpDPTE+2], bx ; Segment = FFFFh
116%else
117 mov [di+EDRIVE_INFO.fpDPTE], bx
118 mov [di+EDRIVE_INFO.fpDPTE+2], bx
119%endif ; MODULE_COMPATIBLE_TABLES
120
121 ; Fill Extended Drive Information Table in DS:DI from DPT in ES:SI
122.SkipEddConfigurationParameters:
123 mov WORD [di+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS
124
125 ; Store total sector count
126 call Registers_ExchangeDSSIwithESDI
127 call AccessDPT_GetLbaSectorCountToBXDXAX
128 call Registers_ExchangeDSSIwithESDI
129 mov [di+EDRIVE_INFO.qwTotalSectors], ax
130 mov [di+EDRIVE_INFO.qwTotalSectors+2], dx
131 mov [di+EDRIVE_INFO.qwTotalSectors+4], bx
132 xor cx, cx
133 mov [di+EDRIVE_INFO.qwTotalSectors+6], cx ; Always zero
134 mov WORD [di+EDRIVE_INFO.wSectorSize], 512
135
136 ; Store P-CHS. Based on phoenix specification this is returned only if
137 ; total sector count is 15,482,880 or less.
138 sub ax, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) & 0FFFFh
139 sbb dx, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) >> 16
140 sbb bx, cx ; Zero
141 jnc SHORT .DoNotSetChsFlag
142 or BYTE [di+EDRIVE_INFO.wFlags], FLG_CHS_INFORMATION_IS_VALID
143
144 ; We store something to P-CHS anyway since some HW detection programs
145 ; ignore the CHS flag. And we should at least clear the variables anyway
146 ; since the same buffer is used for all drives so it contains parameters
147 ; from previously scanned drive.
148.DoNotSetChsFlag:
149 eMOVZX dx, [es:si+DPT.bPchsHeads]
150 mov [di+EDRIVE_INFO.dwHeads], dx
151 mov [di+EDRIVE_INFO.dwHeads+2], cx
152
153 mov dl, [es:si+DPT.bPchsSectorsPerTrack]
154 mov [di+EDRIVE_INFO.dwSectorsPerTrack], dx
155 mov [di+EDRIVE_INFO.dwSectorsPerTrack+2], cx
156
157 mov dx, [es:si+DPT.wPchsCylinders]
158 mov [di+EDRIVE_INFO.dwCylinders], dx
159 mov [di+EDRIVE_INFO.dwCylinders+2], cx
160
161 xchg ax, cx ; Success
162 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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