source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH15h_HSize.asm@ 575

Last change on this file since 575 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: 3.8 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Int 13h function AH=15h, Read Disk Drive Size.
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=15h, Read Disk Drive Size.
25;
26; It is unclear what is the total number of sectors to return.
27; Award BIOS from 1997 returns full capacity instead of L-CHS limit
28; like we do. I think it makes more sense if this function returns
29; L-CHS limit.
30;
31; AH15h_HandlerForReadDiskDriveSize
32; Parameters:
33; DL: Translated Drive number
34; DS:DI: Ptr to DPT (in RAMVARS segment)
35; SS:BP: Ptr to IDEPACK
36; Returns with INTPACK:
37; If successful:
38; AH: Hard Disk: 3 (Hard disk accessible)
39; Floppy: 1 (Floppy disk, without change detection)
40; CX:DX: Total number of sectors
41; CF: 0
42; If failed:
43; AH: 0 (Drive not present)
44; CX:DX: 0
45; CF: 1
46;--------------------------------------------------------------------
47AH15h_HandlerForReadDiskDriveSize:
48%ifdef MODULE_SERIAL_FLOPPY
49 mov cl, 1 ; 1 = floppy disk, no change detection
50
51 test dl,dl ; DO NOT store the sector count if this is a
52 jns .FloppyDrive ; floppy disk, some OS's depend on this not
53 ; happening for floppies in order to boot.
54%endif
55
56 call AH15h_GetSectorCountToBXDXAX
57 mov [bp+IDEPACK.intpack+INTPACK.cx], dx ; HIWORD to CX
58 xchg [bp+IDEPACK.intpack+INTPACK.dx], ax ; LOWORD to DX, AL gets drive number
59
60 xor ah, ah
61%ifdef MODULE_SERIAL_FLOPPY
62 mov cl, 3 ; 3 = Hard Disk Accessible
63.FloppyDrive:
64
65 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber ; Store success to BDA and CF
66 mov [bp+IDEPACK.intpack+INTPACK.ah], cl
67%else
68 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH ; Store success to BDA and CF
69 mov BYTE [bp+IDEPACK.intpack+INTPACK.ah], 3
70%endif
71
72 jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode
73
74
75;--------------------------------------------------------------------
76; AH15h_GetSectorCountFromForeignDriveToDXAX:
77; AH15h_GetSectorCountToBXDXAX:
78; Parameters:
79; DL: Drive number (AH15h_GetSectorCountFromForeignDriveToDXAX only)
80; DS: RAMVARS segment
81; DS:DI: Ptr to DPT (AH15h_GetSectorCountToDXAX only)
82; Returns:
83; DX:AX: Total sector count
84; BX: Zero
85; Corrupts registers:
86; CX
87;--------------------------------------------------------------------
88%ifdef MODULE_BOOT_MENU
89AH15h_GetSectorCountFromForeignDriveToDXAX:
90 mov ah, GET_DRIVE_PARAMETERS
91 call Int13h_CallPreviousInt13hHandler
92 jmp SHORT ConvertAH08hReturnValuesToSectorCount
93%endif
94
95AH15h_GetSectorCountToBXDXAX:
96 call AH8h_GetDriveParameters
97 ; Fall to ConvertAH08hReturnValuesToSectorCount
98
99ConvertAH08hReturnValuesToSectorCount:
100 call Address_ExtractLCHSparametersFromOldInt13hAddress
101 mov al, bh ; AL = Max head number
102 inc cx ; Max cylinder number to cylinder count
103 inc ax ; Max head number to head count (AH=8h returns max 254 so no overflow to AH)
104 mul bl ; AX = Head count * Sectors per track
105 mul cx ; DX:AX = Total sector count for AH=0xh transfer functions
106 xor bx, bx
107 ret
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