source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.asm@ 514

Last change on this file since 514 was 507, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

  • Reduced minimum time to display hotkeys. Now it is 2 seconds.
  • Brought back IDE controller reset.
  • Space savings by merging AH=Dh to AH=0h. AH=Dh is now redirected to AH=9h.
File size: 7.0 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Int 13h function AH=0h, Disk Controller Reset.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 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=0h, Disk Controller Reset.
25;
26; Note: We handle all AH=0h calls, even for drives handled by other
27; BIOSes!
28;
29; AH0h_HandlerForDiskControllerReset
30; Parameters:
31; DL: Translated Drive number (ignored so all drives are reset)
32; If bit 7 is set all hard disks and floppy disks reset.
33; DS:DI: Ptr to DPT (or Null if foreign drive)
34; SS:BP: Ptr to IDEPACK
35; Returns with INTPACK:
36; AH: Int 13h return status (from drive requested in DL)
37; CF: 0 if successful, 1 if error
38;--------------------------------------------------------------------
39AH0h_HandlerForDiskControllerReset:
40 ; Reset foreign Floppy and Hard Drives (those handled by other BIOSes)
41 eMOVZX bx, dl ; Copy requested drive to BL and zero BH to assume no errors
42
43 xor ah, ah ; Disk Controller Reset
44 call Int13h_CallPreviousInt13hHandler ; Reset floppy drives only or floppy drives and foreign hard disks
45 call BackupErrorCodeFromTheRequestedDriveToBH
46
47%ifdef MODULE_SERIAL_FLOPPY
48;
49; "Reset" emulated serial floppy drives, if any. There is nothing to actually do for this reset,
50; but record the proper error return code if one of these floppy drives is the drive requested.
51;
52 call RamVars_UnpackFlopCntAndFirstToAL
53 cbw ; Clears AH (there are flop drives) or ffh (there are not)
54 ; Either AH has success code (flop drives are present)
55 ; or it doesn't matter because we won't match drive ffh
56
57 cwd ; clears DX (there are flop drives) or ffffh (there are not)
58
59 adc dl, al ; second drive (CF set) if present
60 ; If no drive is present, this will result in ffh which
61 ; won't match a drive
62 call BackupErrorCodeFromTheRequestedDriveToBH
63 mov dl, al ; We may end up doing the first drive twice (if there is
64 call BackupErrorCodeFromTheRequestedDriveToBH ; only one drive), but doing it again is not harmful.
65%endif
66 test bl, bl ; If we were called with a floppy disk, then we are done,
67 jns SHORT .SkipHardDiskReset ; don't do hard disks.
68
69 ; Resetting our hard disks will modify dl and bl to be idevars offset based instead of drive number based,
70 ; such that this call must be the last in the list of reset routines called.
71 ;
72 ; This needs to happen after ResetForeignDrives, as that call may have set the error code for 80h,
73 ; and we need to override that value if we are xlate'd into 80h with one of our drives.
74 ;
75 call ResetHardDisksHandledByOurBIOS
76
77.SkipHardDiskReset:
78 mov ah, bh
79 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
80
81
82;--------------------------------------------------------------------
83; BackupErrorCodeFromTheRequestedDriveToBH
84; Parameters:
85; AH: Error code from the last resetted drive
86; DL: Drive last resetted
87; BL: Requested drive (DL when entering AH=00h)
88; Returns:
89; BH: Backuped error code
90; Corrupts registers:
91; Nothing
92;--------------------------------------------------------------------
93BackupErrorCodeFromTheRequestedDriveToBH:
94 cmp dl, bl ; Requested drive?
95 eCMOVE bh, ah
96 ret
97
98
99
100; This defines what is called when resetting our drives at the end of drive detection.
101AH0h_ResetAllOurHardDisksAtTheEndOfDriveInitialization equ ResetHardDisksHandledByOurBIOS.ErrorCodeNotUsed
102
103;--------------------------------------------------------------------
104; ResetHardDisksHandledByOurBIOS
105; Parameters:
106; BL: Requested drive (DL when entering AH=00h)
107; DS:DI: Ptr to DPT for requested drive
108; If DPT pointer is not available, or error result in BH won't be used anyway,
109; enter through .ErrorCodeNotUsed.
110; SS:BP: Ptr to IDEPACK
111; Returns:
112; BH: Error code from requested drive (if available)
113; Corrupts registers:
114; AX, BX, CX, DX, SI, DI
115;--------------------------------------------------------------------
116ResetHardDisksHandledByOurBIOS:
117 xor bl, bl ; Assume Null IdevarsOffset for now, assuming foreign drive
118 test di, di
119 jz SHORT .ErrorCodeNotUsed
120 mov bl, [di+DPT.bIdevarsOffset] ; replace drive number with Idevars pointer for cmp with dl
121.ErrorCodeNotUsed:
122
123 mov si, ControllerResetForDPTinDSDI
124 call .CallSIforEveryDrive ; Reset all drives to power on settings
125 mov si, AH9h_InitializeDriveForUse
126 ; Fall to .CallSIforEveryDrive ; Initialize all drives
127
128.CallSIforEveryDrive: ; BH will be garbage on exit if this entry point is used,
129 ; but reset of all drives will still happen
130
131 mov dl, ROMVARS.ideVars0 ; starting Idevars offset
132
133 ; Get count of ALL Idevars structures, not just the ones that are configured. This may seem odd,
134 ; but it catches the .ideVarsSerialAuto structure, which would not be scanned if the count from
135 ; RamVars_GetIdeControllerCountToCX was used. Unused controllers won't make a difference, since no DPT
136 ; will point to them. Performance isn't an issue, as this is a reset operation.
137 ;
138 mov cx, NUMBER_OF_IDEVARS
139
140.loop:
141 push si
142 call FindDPT_ForIdevarsOffsetInDL ; look for the first drive on this controller, if any
143 pop si
144 jc SHORT .notFound
145
146 push bx
147 push cx
148 push dx
149 call si ; Reset Master AND Slave or initialize Master OR Slave drive
150 pop dx
151 pop cx
152 pop bx
153 call BackupErrorCodeFromTheRequestedDriveToBH ; save error code if same controller as drive from entry
154
155.notFound:
156 add dl, IDEVARS_size ; move Idevars pointer forward
157 loop .loop
158 ret
159
160
161;--------------------------------------------------------------------
162; ControllerResetForDPTinDSDI
163; Parameters:
164; DS:DI: Ptr to DPT for drive to reset (resets both Master and Slave drive)
165; SS:BP: Ptr to IDEPACK
166; Returns:
167; AH: Int 13h return status
168; CF: 0 if successful, 1 if error
169; Corrupts registers:
170; AL, BX, CX, DX
171;--------------------------------------------------------------------
172ControllerResetForDPTinDSDI:
173%ifdef MODULE_IRQ
174 call Interrupts_UnmaskInterruptControllerForDriveInDSDI
175%endif
176%ifdef MODULE_ADVANCED_ATA
177 call Device_ResetMasterAndSlaveController
178 jmp AdvAtaInit_InitializeControllerForDPTinDSDI
179%else
180 jmp Device_ResetMasterAndSlaveController
181%endif
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