source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH41h_CheckIfExtensionsPresent.asm@ 602

Last change on this file since 602 was 592, checked in by Krister Nordvall, 6 years ago

Changes:

  • The problem with NASM in the previous revision (r591) has been fixed.
  • The colors used by the boot menu and hotkey bar can now be customized by selecting one of a number of pre-defined color themes. Suggestions for additional themes are more than welcome!
  • Large builds are now 10 KB. Small builds are still 8 KB with the exception of the Tiny build which is now 4 KB. In other words, builds are now as small as possible to make it easier to combine them with other BIOSes.
  • Added code to the library to improve drive error handling. XTIDECFG can now handle "Drive Not Ready" errors.
  • Fixed a couple of potential bugs in AtaID.asm (AtaID_GetMaxPioModeToAXandMinCycleTimeToCX); 1) ATA1.bPioMode was treated as a WORD variable. 2) ATA2.bPIOSupp was assumed to be non-zero which would result in PIO mode 3 being returned if the assumption was wrong.
  • Made the same changes in the equivalent function used by BIOSDRVS (DisplayPioModeInformationUsingAtaInfoFromDSBX in AtaInfo.asm).
  • Fixed a bug from r587 in PDC20x30.asm in PDC20x30_GetMaxPioModeToALandMinPioCycleTimeToBX.
  • Fixed a bug from r523 in XTIDECFG where Auto Configure would only set the IRQ on one IDE interface on AT-builds.
  • XTIDECFG will now restore the default settings for the "Serial port virtual device" when reselecting it in the list of device types. This makes it behave consistently for all device types.
  • The eAAM macro is now used regardless if USE_UNDOC_INTEL is defined or not because it is apparently supported on all processors including the NEC V20/V30 CPUs.
  • Renamed the EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS define to EXCLUDE_FROM_XUB.
  • Added a define to exclude unused library code from BIOSDRVS (EXCLUDE_FROM_BIOSDRVS). This makes it a lot smaller than in previous revisions.
  • All unnecessary CLD-instructions are now under a new define 'CLD_NEEDED' which is only enabled for the BIOS. It is disabled for XTIDECFG and BIOSDRVS but can be enabled if needed by adding this define to the respective makefile. This change was made because these unnecessary instructions are wasteful and should never be needed. In fact, they only serve to hide bugs (in other peoples code) which I strongly believe should be avoided. I recommend people making their own BIOSes from source to not use this define as it's extremely unlikely to be needed.
  • Updated the copyright info in SerDrive and changed an URL to point to the new site.
  • Updated the copyright info and version number in BIOSDRVS.
  • Updated the copyright info in XTIDECFG.
  • Optimizations in general.
File size: 3.4 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 not WORD [bp+IDEPACK.intpack+INTPACK.bx] ; 55AAh = AA55h
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%ifdef USE_AT ; Always in Full mode
78%ifndef MODULE_8BIT_IDE OR MODULE_SERIAL
79 mov cx, ENHANCED_DRIVE_ACCESS_SUPPORT | ENHANCED_DISK_DRIVE_SUPPORT
80%else
81 mov cx, ENHANCED_DRIVE_ACCESS_SUPPORT
82 cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_ATA
83 jae SHORT .DoNotSetEDDflag
84 or cl, ENHANCED_DISK_DRIVE_SUPPORT
85%endif
86%else ; ~USE_AT
87 mov cx, ENHANCED_DRIVE_ACCESS_SUPPORT
88
89 ; DPTE needs buffer from RAM so do not return it in lite mode
90 test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
91 jz SHORT .DoNotSetEDDflag
92
93%ifdef MODULE_8BIT_IDE OR MODULE_SERIAL
94 ; DPTE contains information for device drivers. We should not return
95 ; DPTE for 8-bit devices since software would think they are 16-bit devices.
96 cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_ATA
97 jae SHORT .DoNotSetEDDflag
98%endif
99
100 or cl, ENHANCED_DISK_DRIVE_SUPPORT ; AH=48h returns DPTE
101%endif ; USE_AT
102.DoNotSetEDDflag:
103 ret
104
105%endif ; MODULE_COMPATIBLE_TABLES
Note: See TracBrowser for help on using the repository browser.