source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AHDh_HReset.asm@ 282

Last change on this file since 282 was 282, checked in by gregli@…, 13 years ago

More fun with resets: It turns out to be important to reset our drives too, if for not other reason then to have the proper return code set for xlat'd drives (consider the case that we reset foreign drives with dl=80h, and at the same time we have one of our drives mapped to 80h). Fixed bug with polarity of ther iteration routine in ahDh for the return value for ah9h. Update signature in Configurator.

File size: 2.7 KB
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1; Project name : XTIDE Universal BIOS
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:
12; DL: Translated Drive number
13; DS:DI: Ptr to DPT (in RAMVARS segment)
14; SS:BP: Ptr to IDEPACK
15; Returns with INTPACK:
16; AH: Int 13h return status
17; CF: 0 if succesfull, 1 if error
18;--------------------------------------------------------------------
19ALIGN JUMP_ALIGN
20AHDh_HandlerForResetHardDisk:
21%ifndef USE_186
22 call AHDh_ResetDrive
23 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
24%else
25 push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
26 ; Fall to AHDh_ResetDrive
27%endif
28
29
30;--------------------------------------------------------------------
31; Resets hard disk.
32;
33; AHDh_ResetDrive
34; Parameters:
35; DS:DI: Ptr to DPT
36; SS:BP: Ptr to IDEPACK
37; Returns:
38; AH: Int 13h return status
39; CF: 0 if succesfull, 1 if error
40; Corrupts registers:
41; AL, SI
42;--------------------------------------------------------------------
43AHDh_ResetDrive:
44 push dx
45 push cx
46 push bx
47 push di
48
49 call Interrupts_UnmaskInterruptControllerForDriveInDSDI
50 call Device_ResetMasterAndSlaveController
51 ;jc SHORT .ReturnError ; CF would be set if slave drive present without master
52 ; (error register has special values after reset)
53
54 ; Initialize Master and Slave drives
55 mov al, [di+DPT.bIdevarsOffset] ; pointer to controller we are looking to reset
56 mov ah, 0 ; initialize error code, assume success
57
58 mov si, IterateAndResetDrives
59 call FindDPT_IterateAllDPTs
60
61 shr ah, 1 ; Move error code and CF into proper position
62
63 pop di
64 pop bx
65 pop cx
66 pop dx
67 ret
68
69;--------------------------------------------------------------------
70; IterateAndResetDrives: Iteration routine for use with IterateAllDPTs.
71;
72; When a drive on the controller is found, it is reset, and the error code
73; merged into overall error code for this controller. Master will be reset
74; first. Note that the iteration will go until the end of the DPT list.
75;--------------------------------------------------------------------
76IterateAndResetDrives:
77 cmp al, [di+DPT.bIdevarsOffset] ; The right controller?
78 jne .done
79 push ax
80 call AH9h_InitializeDriveForUse ; Reset Master and Slave (Master will come first in DPT list)
81 pop ax
82 jnc .done
83 or ah, (RET_HD_RESETFAIL << 1) | 1 ; OR in Reset Failed error code and CF, will SHR into position later
84.done:
85 stc ; From IterateAllDPTs perspective, the DPT is never found (continue iteration)
86 ret
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