source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.asm@ 88

Last change on this file since 88 was 84, checked in by krille_n_@…, 13 years ago

Minor size optimizations in various files.
File size: 5.5 KB
RevLine 
[3]1; File name : AH0h_HReset.asm
2; Project name : IDE BIOS
3; Created date : 27.9.2007
[84]4; Last update : 13.1.2011
5; Author : Tomi Tilli,
6; : Krister Nordvall (optimizations)
[3]7; Description : Int 13h function AH=0h, Disk Controller Reset.
8
9; Section containing code
10SECTION .text
11
12;--------------------------------------------------------------------
13; Int 13h function AH=0h, Disk Controller Reset.
14;
15; AH0h_HandlerForDiskControllerReset
16; Parameters:
17; AH: Bios function 0h
18; DL: Drive number (ignored so all drives are reset)
19; If bit 7 is set all hard disks and floppy disks reset.
20; Parameters loaded by Int13h_Jump:
21; DS: RAMVARS segment
22; Returns:
[23]23; AH: Int 13h return status (from drive requested in DL)
[3]24; CF: 0 if succesfull, 1 if error
25; IF: 1
26; Corrupts registers:
27; Flags
28;--------------------------------------------------------------------
29ALIGN JUMP_ALIGN
30AH0h_HandlerForDiskControllerReset:
31 push dx
32 push cx
33 push bx
34 push ax
35
[23]36 eMOVZX bx, dl ; Copy requested drive to BL, zero BH to assume no errors
[26]37 call ResetFloppyDrivesWithInt40h
38 test bl, 80h
39 jz SHORT .SkipHardDiskReset
40 call ResetForeignHardDisks
[27]41 call AH0h_ResetHardDisksHandledByOurBIOS
[23]42ALIGN JUMP_ALIGN
[26]43.SkipHardDiskReset:
[23]44 mov ah, bh ; Copy error code to AH
45 xor al, al ; Zero AL...
[27]46 cmp al, bh ; ...and set CF if error
[35]47 jmp Int13h_PopXRegsAndReturn
[3]48
49
50;--------------------------------------------------------------------
[26]51; ResetFloppyDrivesWithInt40h
[3]52; Parameters:
[23]53; BL: Requested drive (DL when entering AH=00h)
54; Returns:
55; BH: Error code from requested drive (if available)
56; Corrupts registers:
[27]57; AX, DL, DI
[23]58;--------------------------------------------------------------------
59ALIGN JUMP_ALIGN
[26]60ResetFloppyDrivesWithInt40h:
[27]61 call GetDriveNumberForForeignBiosesToDL
62 and dl, 7Fh ; Clear hard disk bit
[26]63 xor ah, ah ; Disk Controller Reset
[23]64 int INTV_FLOPPY_FUNC
[26]65 jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
[23]66
67
68;--------------------------------------------------------------------
[26]69; ResetForeignHardDisks
[23]70; Parameters:
71; BL: Requested drive (DL when entering AH=00h)
[3]72; DS: RAMVARS segment
73; Returns:
[23]74; BH: Error code from requested drive (if available)
[3]75; Corrupts registers:
[27]76; AX, DL, DI
[23]77;--------------------------------------------------------------------
78ALIGN JUMP_ALIGN
[26]79ResetForeignHardDisks:
[27]80 call GetDriveNumberForForeignBiosesToDL
81 xor ah, ah ; Disk Controller Reset
[32]82 call Int13h_CallPreviousInt13hHandler
[26]83 jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
[23]84
[26]85
[3]86;--------------------------------------------------------------------
[27]87; GetDriveNumberForForeignBiosesToDL
88; Parameters:
89; BL: Requested drive (DL when entering AH=00h)
90; DS: RAMVARS segment
91; Returns:
92; DL: BL if foreign drive
93; 80h if our drive
94; Corrupts registers:
95; DI
96;--------------------------------------------------------------------
97ALIGN JUMP_ALIGN
98GetDriveNumberForForeignBiosesToDL:
99 mov dl, bl
100 call RamVars_IsDriveHandledByThisBIOS
[84]101 jnc SHORT .Return ; Return what was in BL unmodified
102 mov dl, 80h
[27]103ALIGN JUMP_ALIGN
[84]104.Return:
[27]105 ret
106
107
108;--------------------------------------------------------------------
[26]109; ResetHardDisksHandledByOurBIOS
[23]110; Parameters:
111; BL: Requested drive (DL when entering AH=00h)
112; DS: RAMVARS segment
113; Returns:
114; BH: Error code from requested drive (if available)
115; Corrupts registers:
[27]116; AX, CX, DX, DI
[23]117;--------------------------------------------------------------------
[3]118ALIGN JUMP_ALIGN
[27]119AH0h_ResetHardDisksHandledByOurBIOS:
[26]120 mov dh, [RAMVARS.bDrvCnt] ; Load drive count to DH
121 test dh, dh
122 jz SHORT .AllDrivesReset ; Return if no drives
123 mov dl, [RAMVARS.bFirstDrv] ; Load number of first our drive
124 add dh, dl ; DH = one past last drive to reset
[3]125ALIGN JUMP_ALIGN
[26]126.DriveResetLoop:
127 call AHDh_ResetDrive
[27]128 call .BackupErrorCodeFromMasterOrSlaveToBH
[26]129 inc dx
130 cmp dl, dh ; All done?
131 jb SHORT .DriveResetLoop ; If not, reset next drive
132.AllDrivesReset:
[3]133 ret
134
135;--------------------------------------------------------------------
[27]136; .BackupErrorCodeFromMasterOrSlaveToBH
[3]137; Parameters:
[27]138; AH: Error code for drive DL reset
139; BL: Requested drive (DL when entering AH=00h)
[26]140; DL: Drive just resetted
[3]141; DS: RAMVARS segment
142; Returns:
[27]143; BH: Backuped error code
[26]144; DL: Incremented if next drive is slave drive
145; (=already resetted)
[3]146; Corrupts registers:
[27]147; CX, DI
[3]148;--------------------------------------------------------------------
149ALIGN JUMP_ALIGN
[27]150.BackupErrorCodeFromMasterOrSlaveToBH:
151 call BackupErrorCodeFromTheRequestedDriveToBH
152 mov cx, [RAMVARS.wIdeBase] ; Load base port for resetted drive
[26]153
[27]154 inc dx ; DL to next drive
155 call FindDPT_ForDriveNumber ; Get DPT to DS:DI, store port to RAMVARS
156 jnc SHORT .NoMoreDrivesOrNoSlaveDrive
157 cmp cx, [RAMVARS.wIdeBase] ; Next drive is from same controller?
158 je SHORT BackupErrorCodeFromTheRequestedDriveToBH
159.NoMoreDrivesOrNoSlaveDrive:
160 dec dx
[3]161 ret
162
163
164;--------------------------------------------------------------------
[26]165; BackupErrorCodeFromTheRequestedDriveToBH
[3]166; Parameters:
[23]167; AH: Error code from the last resetted drive
168; DL: Drive last resetted
169; BL: Requested drive (DL when entering AH=00h)
[3]170; Returns:
[23]171; BH: Backuped error code
[3]172; Corrupts registers:
173; Nothing
174;--------------------------------------------------------------------
175ALIGN JUMP_ALIGN
[26]176BackupErrorCodeFromTheRequestedDriveToBH:
177 cmp dl, bl ; Requested drive?
[23]178 jne SHORT .Return
179 mov bh, ah
180ALIGN JUMP_ALIGN
181.Return:
[3]182 ret
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