source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH41h_CheckIfExtensionsPresent.asm @ 567

Last change on this file since 567 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: 3.1 KB
Line 
1; Project name  :   XTIDE Universal BIOS
2; Description   :   Int 13h function AH=41h, Check if Extensions Present.
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=41h, Check if Extensions Present.
25;
26; AH41h_HandlerForCheckIfExtensionsPresent
27;   Parameters:
28;       DL:     Translated Drive number
29;       DS:DI:  Ptr to DPT (in RAMVARS segment)
30;       SS:BP:  Ptr to IDEPACK
31;   Parameters on INTPACK:
32;       BX:     55AAh
33;   Returns with INTPACK:
34;       AH:     Major version of EBIOS extensions
35;       BX:     AA55h
36;       CX:     Support bits
37;       CF:     0 if successful, 1 if error
38;--------------------------------------------------------------------
39AH41h_HandlerForCheckIfExtensionsPresent:
40    cmp     WORD [bp+IDEPACK.intpack+INTPACK.bx], 55AAh
41%ifdef USE_386
42    jne     Int13h_DirectCallToAnotherBios
43%else
44    jne     SHORT .EbiosNotSupported
45%endif
46
47    mov     BYTE [bp+IDEPACK.intpack+INTPACK.ah], EBIOS_VERSION
48    mov     WORD [bp+IDEPACK.intpack+INTPACK.bx], 0AA55h
49
50%ifdef MODULE_COMPATIBLE_TABLES
51    call    AH41h_GetSupportBitsToCX
52    mov     [bp+IDEPACK.intpack+INTPACK.cx], cx
53%else
54    mov     WORD [bp+IDEPACK.intpack+INTPACK.cx], ENHANCED_DRIVE_ACCESS_SUPPORT
55%endif ; MODULE_COMPATIBLE_TABLES
56
57    and     BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF  ; Return with CF cleared
58    jmp     Int13h_ReturnFromHandlerWithoutStoringErrorCode
59
60%ifndef USE_386
61.EbiosNotSupported:
62    jmp     Int13h_DirectCallToAnotherBios
63%endif
64
65
66%ifdef MODULE_COMPATIBLE_TABLES
67;--------------------------------------------------------------------
68; AH41h_GetSupportBitsToCX
69;   Parameters:
70;       DS:DI:  Ptr to DPT (in RAMVARS segment)
71;   Returns:
72;       CX:     Support bits returned by AH=41h
73;   Corrupts registers:
74;       Nothing
75;--------------------------------------------------------------------
76AH41h_GetSupportBitsToCX:
77    mov     cx, ENHANCED_DRIVE_ACCESS_SUPPORT
78
79    ; DPTE needs buffer from RAM so do not return it in lite mode
80%ifndef USE_AT
81    test    BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
82    jz      SHORT .DoNotSetEDDflag
83%endif
84
85%ifdef MODULE_8BIT_IDE OR MODULE_SERIAL
86    ; DPTE contains information for device drivers. We should not return
87    ; DPTE for 8-bit devices since software would think they are 16-bit devices.
88    cmp     BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_ATA
89    jae     SHORT .DoNotSetEDDflag
90%endif
91
92    or      cl, ENHANCED_DISK_DRIVE_SUPPORT ; AH=48h returns DPTE
93.DoNotSetEDDflag:
94    ret
95
96%endif ; MODULE_COMPATIBLE_TABLES
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