source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AHDh_HReset.asm@ 243

Last change on this file since 243 was 200, checked in by gregli@…, 13 years ago

Added logic to skip scanning COM ports if a COM port was already found during the normal detection process, to avoid finding the same serial drive twice and preseting the OS with two drives which in reality point to the same physical file on the server. Also added logic to skip scanning for the slave serial drive if the master was not found. And various small optimizations.
File size: 2.9 KB
RevLine 
[88]1; Project name : XTIDE Universal BIOS
[3]2; Description : Int 13h function AH=Dh, Reset Hard Disk (Alternate reset).
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Int 13h function AH=Dh, Reset Hard Disk (Alternate reset).
9;
10; AHDh_HandlerForResetHardDisk
11; Parameters:
[148]12; DL: Translated Drive number
13; DS:DI: Ptr to DPT (in RAMVARS segment)
[150]14; SS:BP: Ptr to IDEPACK
15; Returns with INTPACK:
[3]16; AH: Int 13h return status
17; CF: 0 if succesfull, 1 if error
18;--------------------------------------------------------------------
19ALIGN JUMP_ALIGN
20AHDh_HandlerForResetHardDisk:
[84]21%ifndef USE_186
[3]22 call AHDh_ResetDrive
[148]23 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
[84]24%else
[148]25 push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
[162]26 ; Fall to AHDh_ResetDrive
[84]27%endif
[3]28
29
30;--------------------------------------------------------------------
31; Resets hard disk.
32;
33; AHDh_ResetDrive
34; Parameters:
35; DL: Drive number
36; DS: RAMVARS segment
[150]37; SS:BP: Ptr to IDEPACK
[3]38; Returns:
39; AH: Int 13h return status
40; CF: 0 if succesfull, 1 if error
41; Corrupts registers:
[150]42; AL, CX, SI, DI
[3]43;--------------------------------------------------------------------
[170]44;ALIGN JUMP_ALIGN
[3]45AHDh_ResetDrive:
[26]46 push dx
47 push bx
48
[3]49 call FindDPT_ForDriveNumber ; DS:DI now points to DPT
[33]50 call Interrupts_UnmaskInterruptControllerForDriveInDSDI
[150]51 call Device_ResetMasterAndSlaveController
[3]52 ;jc SHORT .ReturnError ; CF would be set if slave drive present without master
53 ; (error register has special values after reset)
54
55 ; Initialize Master and Slave drives
[150]56 eMOVZX bx, BYTE [di+DPT.bIdevarsOffset]
57 mov dx, [cs:bx+IDEVARS.wPort]
58 call InitializeMasterAndSlaveDriveFromPortInDX
[26]59
60 pop bx
61 pop dx
[3]62 ret
63
64
65;--------------------------------------------------------------------
[150]66; InitializeMasterAndSlaveDriveFromPortInDX
[3]67; Parameters:
68; DX: IDE Base Port address
[150]69; SS:BP: Ptr to IDEPACK
[3]70; Returns:
[26]71; AH: Error code
[3]72; CF: 0 if initialization succesfull
73; 1 if any error
74; Corrupts registers:
[150]75; AL, BX, CX, DX, SI, DI
[3]76;--------------------------------------------------------------------
77ALIGN JUMP_ALIGN
[150]78InitializeMasterAndSlaveDriveFromPortInDX:
[3]79 push dx ; Store base port address
80 xor cx, cx ; Assume no errors
[200]81 FindDPT_ToDSDIForIdeMasterAtPortDX
[3]82 jnc SHORT .InitializeSlave ; Master drive not present
83 call AH9h_InitializeDriveForUse
84 mov cl, ah ; Copy error code to CL
85.InitializeSlave:
86 pop dx ; Restore base port address
[200]87 FindDPT_ToDSDIForIdeSlaveAtPortDX
[3]88 jnc SHORT .CombineErrors ; Slave drive not present
89 call AH9h_InitializeDriveForUse
90 mov ch, ah ; Copy error code to CH
91.CombineErrors:
92 or cl, ch ; OR error codes, clear CF
[116]93 jz SHORT .Return
[26]94 mov ah, RET_HD_RESETFAIL ; Load Reset Failed error code
[3]95 stc
[116]96.Return:
[3]97 ret
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