source: xtideuniversalbios/trunk/Assembly_Library/Src/File/Drive.asm@ 592

Last change on this file since 592 was 592, checked in by Krister Nordvall, 7 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: 5.7 KB
RevLine 
[41]1; Project name : Assembly Library
2; Description : Functions for accessing drives.
3
[376]4;
[526]5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
[376]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.
[526]12;
[376]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
[526]16; GNU General Public License for more details.
[376]17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
[41]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;--------------------------------------------------------------------
[592]32%ifndef EXCLUDE_FROM_XTIDECFG
[41]33ALIGN JUMP_ALIGN
34Drive_GetNumberOfAvailableDrivesToAX:
35 push dx
36 push cx
37
38 call Drive_GetFlagsForAvailableDrivesToDXAX
39 call Bit_GetSetCountToCXfromDXAX
40 xchg ax, cx
41
42 pop cx
43 pop dx
44 ret
[592]45%endif
[41]46
47
48;--------------------------------------------------------------------
49; Drive_GetFlagsForAvailableDrivesToDXAX
50; Parameters:
51; Nothing
52; Returns:
53; DX:AX: Flags containing valid drives (bit 0 = drive A, bit 1 = drive B ...)
54; Corrupts registers:
55; Nothing
56;--------------------------------------------------------------------
57ALIGN JUMP_ALIGN
58Drive_GetFlagsForAvailableDrivesToDXAX:
59 push cx
60 push bx
61 mov dx, DosCritical_HandlerToIgnoreAllErrors
62 call DosCritical_InstallNewHandlerFromCSDX
63
64 call .GetNumberOfPotentiallyValidDriveLettersToCX
65 xor bx, bx
66 xor ax, ax ; Temporary use BX:AX for flags
[133]67 cwd ; Start from drive 0
[41]68 call .CheckDriveValidityUntilCXisZero
69 mov dx, bx ; Flags now in DX:AX
70
71 call DosCritical_RestoreDosHandler
72 pop bx
73 pop cx
74 ret
75
76;--------------------------------------------------------------------
77; .GetNumberOfPotentiallyValidDriveLettersToCX
78; Parameters:
79; Nothing
80; Returns:
81; CX: Number of potentially valid drive letters available
82; Corrupts registers:
83; AX, DX
84;--------------------------------------------------------------------
85ALIGN JUMP_ALIGN
86.GetNumberOfPotentiallyValidDriveLettersToCX:
87 call Drive_GetDefaultToAL
88 xchg dx, ax ; Default drive to DL
89 call Drive_SetDefaultFromDL
[589]90 cmp al, 32 ; Number of potentially valid drive letters available
91 jb SHORT .Below32
92 mov al, 32
93.Below32:
94 cbw
95 xchg cx, ax
[41]96 ret
97
98;--------------------------------------------------------------------
99; .CheckDriveValidityUntilCXisZero
100; Parameters:
101; CX: Number of potentially valid drive letters left
102; DL: Drive number (00h=A:, 01h=B: ...)
103; BX:AX: Flags for drive numbers
104; Returns:
105; BX:AX: Flags for valid drive numbers
106; Corrupts registers:
107; CX, DX
108;--------------------------------------------------------------------
109ALIGN JUMP_ALIGN
110.CheckDriveValidityUntilCXisZero:
111 call .IsValidDriveNumberInDL
112 jnz SHORT .PrepareToCheckNextDrive
113 call .SetFlagToBXAXfromDriveInDL
114ALIGN JUMP_ALIGN
115.PrepareToCheckNextDrive:
116 inc dx
117 loop .CheckDriveValidityUntilCXisZero
118 ret
119
120;--------------------------------------------------------------------
121; .IsValidDriveNumberInDL
122; Parameters:
123; DL: Drive number (00h=A:, 01h=B: ...)
124; Returns:
125; ZF: Set if drive number is valid
126; Cleared if drive number is invalid
127; Corrupts registers:
128; Nothing
129;--------------------------------------------------------------------
130ALIGN JUMP_ALIGN
131.IsValidDriveNumberInDL:
132 push ds
133 push bx
134 push ax
135
136 inc dx ; Default drive is 00h and first drive is 01h
[589]137 mov ax, CHECK_IF_BLOCK_DEVICE_REMOTE ; Needs DOS 3.1+
138 mov bx, dx
139 push dx
140 int DOS_INTERRUPT_21h
141 pop dx
142 jnc SHORT .DriveIsValid
143 cmp ax, ERR_DOS_INVALID_DRIVE
144 je SHORT .DriveIsNotValid
145 ; Fall back to old method if ERR_DOS_FUNCTION_NUMBER_INVALID
146
[41]147 mov ah, GET_DOS_DRIVE_PARAMETER_BLOCK_FOR_SPECIFIC_DRIVE
148 int DOS_INTERRUPT_21h
[589]149.DriveIsValid:
150.DriveIsNotValid:
[41]151 dec dx
152 test al, al
153
154 pop ax
155 pop bx
156 pop ds
157 ret
158
159;--------------------------------------------------------------------
160; .SetFlagToBXAXfromDriveInDL
161; Parameters:
162; DL: Drive number (0...31)
163; BX:AX: Flags containing drive numbers
164; Returns:
165; BX:AX: Flags with wanted drive bit set
166; Corrupts registers:
167; Nothing
168;--------------------------------------------------------------------
169ALIGN JUMP_ALIGN
170.SetFlagToBXAXfromDriveInDL:
171 push cx
172
173 mov cl, dl
174 xchg dx, bx
175 call Bit_SetToDXAXfromIndexInCL
176 xchg bx, dx
177
178 pop cx
179 ret
180
181
182;--------------------------------------------------------------------
183; Drive_GetDefaultToAL
184; Parameters:
185; Nothing
186; Returns:
187; AL: Current default drive (00h=A:, 01h=B: ...)
188; Corrupts registers:
189; AH
190;--------------------------------------------------------------------
191ALIGN JUMP_ALIGN
192Drive_GetDefaultToAL:
193 mov ah, GET_CURRENT_DEFAULT_DRIVE
[133]194 SKIP2B f ; cmp ax, <next instruction>
195 ; Fall to Drive_SetDefaultFromDL
[41]196
197
198;--------------------------------------------------------------------
199; Drive_SetDefaultFromDL
200; Parameters:
201; DL: New default drive (00h=A:, 01h=B: ...)
202; Returns:
203; AL: Number of potentially valid drive letters available
204; Corrupts registers:
205; AH
206;--------------------------------------------------------------------
207Drive_SetDefaultFromDL:
208 mov ah, SELECT_DEFAULT_DRIVE
209 int DOS_INTERRUPT_21h
210 ret
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