source: xtideuniversalbios/trunk/Assembly_Library/Src/File/Drive.asm @ 589

Last change on this file since 589 was 589, checked in by krille_n_, 8 years ago

Changes:

  • BIOS: Fixed a purely cosmetic bug from r542 where, in builds containing MODULE_EBIOS, the boot menu would display an incorrect drive size (0.4 kB with MODULE_STRINGS_COMPRESSED or 0.5 kB without) for old drives with no support for LBA.
  • Fixed a bug from r392 where Vision_DetectAndReturnIDinAXandPortInDXifControllerPresent would return the ID in AL instead of AH (if DANGEROUS_DETECTION had been defined).
  • Fixed a bug from r587 in AdvAtaInit.asm that would prevent detection of QDI Vision controllers.
  • Also changed how the QDI Vision IDs are defined (removed the need for shifting) to avoid confusion. This fixed a potential bug from r587 in AdvAtaInit.asm where some IDs were not being shifted.
  • Fixed a bug in PDC20x30.asm from r587 where GetPdcIDtoAX would not return with the IDE base port in DX so DisablePdcProgrammingMode would fail.
  • Made some changes to ModuleDependency.inc and other files so that MODULE_ADVANCED_ATA now requires USE_386. Consequently it is no longer included in the regular AT-builds, only in the 386_8k-build.
  • Moved the UNROLL_SECTORS_IN_CX_TO_xWORDS macros from IDE_8bit.inc to IdeIO.inc which means it's now possible to build a BIOS without MODULE_8BIT_IDE.
  • XTIDECFG: Added a minimum DOS version check (since it needs DOS version 2+) to allow the program to quit gracefully in the unlikely scenario where someone tries to run it under DOS version 1.
  • Made some changes to Drive.asm to improve drive enumeration. The old method using GET_DOS_DRIVE_PARAMETER_BLOCK_FOR_SPECIFIC_DRIVE worked well in Windows XP but not in Windows 98 SE (in Windows or in DOS mode). The two problems were; 1) The function call would access the drives which on single floppy drive systems would cause Windows to swap between A: and B: (throwing a blue screen asking the user to insert a disk etc). 2) Only floppy drives and FAT16 drives would be available in the list of drives, no FAT32/optical/network drives.
  • Improved code in IdeControllerMenu.asm so that the default port addresses for all IDE interfaces are now restored when (re-)selecting the (same) type of IDE device.
  • Also made it impossible to select a device type unless the required module is included in the loaded BIOS.
  • The version check done when loading a BIOS now uses the FLASH_SIGNATURE definition from Version.inc. Any changes affecting RomVars now only requires updating that definition. This means that changes to RomVars must be implemented in both the BIOS and XTIDECFG before being committed to the repository.
  • Added a compatibility fix for 3Com 3C503 cards to the ROM checksumming code in Buffers.asm (Buffers_GenerateChecksum).
  • SerDrive: Made some minor changes to file names and paths to improve compatibility with case sensitive environments.
  • BIOSDRVS: Made a minor size optimization which as a side effect also makes it compatible with all DOS versions including DOS version 1.
  • Library: Renamed the WAIT_RETRACE_IF_NECESSARY_THEN macro to CALL_WAIT_FOR_RETRACE_IF_NECESSARY_THEN and made a tail-call-optimized version of it (JMP_WAIT_FOR_RETRACE_IF_NECESSARY_THEN).
  • A speed optimization to the eRCL_IM macro for 386 and higher. This change breaks emulation in the sense that the macro will fail when given a memory operand as the first parameter.
  • Other minor optimizations and fixes.
File size: 5.6 KB
Line 
1; Project name  :   Assembly Library
2; Description   :   Functions for accessing drives.
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; Drive_GetNumberOfAvailableDrivesToAX
25;   Parameters:
26;       Nothing
27;   Returns:
28;       AX:     Number of available drives
29;   Corrupts registers:
30;       Nothing
31;--------------------------------------------------------------------
32ALIGN JUMP_ALIGN
33Drive_GetNumberOfAvailableDrivesToAX:
34    push    dx
35    push    cx
36
37    call    Drive_GetFlagsForAvailableDrivesToDXAX
38    call    Bit_GetSetCountToCXfromDXAX
39    xchg    ax, cx
40
41    pop     cx
42    pop     dx
43    ret
44
45
46;--------------------------------------------------------------------
47; Drive_GetFlagsForAvailableDrivesToDXAX
48;   Parameters:
49;       Nothing
50;   Returns:
51;       DX:AX:  Flags containing valid drives (bit 0 = drive A, bit 1 = drive B ...)
52;   Corrupts registers:
53;       Nothing
54;--------------------------------------------------------------------
55ALIGN JUMP_ALIGN
56Drive_GetFlagsForAvailableDrivesToDXAX:
57    push    cx
58    push    bx
59    mov     dx, DosCritical_HandlerToIgnoreAllErrors
60    call    DosCritical_InstallNewHandlerFromCSDX
61
62    call    .GetNumberOfPotentiallyValidDriveLettersToCX
63    xor     bx, bx
64    xor     ax, ax              ; Temporary use BX:AX for flags
65    cwd                         ; Start from drive 0
66    call    .CheckDriveValidityUntilCXisZero
67    mov     dx, bx              ; Flags now in DX:AX
68
69    call    DosCritical_RestoreDosHandler
70    pop     bx
71    pop     cx
72    ret
73
74;--------------------------------------------------------------------
75; .GetNumberOfPotentiallyValidDriveLettersToCX
76;   Parameters:
77;       Nothing
78;   Returns:
79;       CX:     Number of potentially valid drive letters available
80;   Corrupts registers:
81;       AX, DX
82;--------------------------------------------------------------------
83ALIGN JUMP_ALIGN
84.GetNumberOfPotentiallyValidDriveLettersToCX:
85    call    Drive_GetDefaultToAL
86    xchg    dx, ax          ; Default drive to DL
87    call    Drive_SetDefaultFromDL
88    cmp     al, 32          ; Number of potentially valid drive letters available
89    jb      SHORT .Below32
90    mov     al, 32
91.Below32:
92    cbw
93    xchg    cx, ax
94    ret
95
96;--------------------------------------------------------------------
97; .CheckDriveValidityUntilCXisZero
98;   Parameters:
99;       CX:     Number of potentially valid drive letters left
100;       DL:     Drive number (00h=A:, 01h=B: ...)
101;       BX:AX:  Flags for drive numbers
102;   Returns:
103;       BX:AX:  Flags for valid drive numbers
104;   Corrupts registers:
105;       CX, DX
106;--------------------------------------------------------------------
107ALIGN JUMP_ALIGN
108.CheckDriveValidityUntilCXisZero:
109    call    .IsValidDriveNumberInDL
110    jnz     SHORT .PrepareToCheckNextDrive
111    call    .SetFlagToBXAXfromDriveInDL
112ALIGN JUMP_ALIGN
113.PrepareToCheckNextDrive:
114    inc     dx
115    loop    .CheckDriveValidityUntilCXisZero
116    ret
117
118;--------------------------------------------------------------------
119; .IsValidDriveNumberInDL
120;   Parameters:
121;       DL:     Drive number (00h=A:, 01h=B: ...)
122;   Returns:
123;       ZF:     Set if drive number is valid
124;               Cleared if drive number is invalid
125;   Corrupts registers:
126;       Nothing
127;--------------------------------------------------------------------
128ALIGN JUMP_ALIGN
129.IsValidDriveNumberInDL:
130    push    ds
131    push    bx
132    push    ax
133
134    inc     dx          ; Default drive is 00h and first drive is 01h
135    mov     ax, CHECK_IF_BLOCK_DEVICE_REMOTE    ; Needs DOS 3.1+
136    mov     bx, dx
137    push    dx
138    int     DOS_INTERRUPT_21h
139    pop     dx
140    jnc     SHORT .DriveIsValid
141    cmp     ax, ERR_DOS_INVALID_DRIVE
142    je      SHORT .DriveIsNotValid
143    ; Fall back to old method if ERR_DOS_FUNCTION_NUMBER_INVALID
144
145    mov     ah, GET_DOS_DRIVE_PARAMETER_BLOCK_FOR_SPECIFIC_DRIVE
146    int     DOS_INTERRUPT_21h
147.DriveIsValid:
148.DriveIsNotValid:
149    dec     dx
150    test    al, al
151
152    pop     ax
153    pop     bx
154    pop     ds
155    ret
156
157;--------------------------------------------------------------------
158; .SetFlagToBXAXfromDriveInDL
159;   Parameters:
160;       DL:     Drive number (0...31)
161;       BX:AX:  Flags containing drive numbers
162;   Returns:
163;       BX:AX:  Flags with wanted drive bit set
164;   Corrupts registers:
165;       Nothing
166;--------------------------------------------------------------------
167ALIGN JUMP_ALIGN
168.SetFlagToBXAXfromDriveInDL:
169    push    cx
170
171    mov     cl, dl
172    xchg    dx, bx
173    call    Bit_SetToDXAXfromIndexInCL
174    xchg    bx, dx
175
176    pop     cx
177    ret
178
179
180;--------------------------------------------------------------------
181; Drive_GetDefaultToAL
182;   Parameters:
183;       Nothing
184;   Returns:
185;       AL:     Current default drive (00h=A:, 01h=B: ...)
186;   Corrupts registers:
187;       AH
188;--------------------------------------------------------------------
189ALIGN JUMP_ALIGN
190Drive_GetDefaultToAL:
191    mov     ah, GET_CURRENT_DEFAULT_DRIVE
192    SKIP2B  f   ; cmp ax, <next instruction>
193    ; Fall to Drive_SetDefaultFromDL
194
195
196;--------------------------------------------------------------------
197; Drive_SetDefaultFromDL
198;   Parameters:
199;       DL:     New default drive (00h=A:, 01h=B: ...)
200;   Returns:
201;       AL:     Number of potentially valid drive letters available
202;   Corrupts registers:
203;       AH
204;--------------------------------------------------------------------
205Drive_SetDefaultFromDL:
206    mov     ah, SELECT_DEFAULT_DRIVE
207    int     DOS_INTERRUPT_21h
208    ret
Note: See TracBrowser for help on using the repository browser.