source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AHDh_HReset.asm@ 262

Last change on this file since 262 was 262, checked in by gregli@…, 13 years ago

More optimizations. Merged RamVars_IsFunction/DriveHandledByThisBIOS in with FindDPT_ForDriveNumber, since they are often used together, making a returned NULL DI pointer indicate a foreign drive in many places. Revamped the iteration done in the handlers for int13/0dh and int13h/0h. Added serial specific print string during drive detection.

File size: 2.7 KB
Line 
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; DL: Drive number
36; DS: RAMVARS segment
37; SS:BP: Ptr to IDEPACK
38; Returns:
39; AH: Int 13h return status
40; CF: 0 if succesfull, 1 if error
41; Corrupts registers:
42; AL, CX, SI
43;--------------------------------------------------------------------
44;ALIGN JUMP_ALIGN
45AHDh_ResetDrive:
46 push dx
47 push bx
48 push di
49
50 call Interrupts_UnmaskInterruptControllerForDriveInDSDI
51 call Device_ResetMasterAndSlaveController
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
56 mov al, [di+DPT.bIdevarsOffset] ; pointer to controller we are looking to reset
57 mov ah, 0 ; initialize error code, assume success
58
59 mov si, IterateAndResetDrives
60 call IterateAllDPTs
61
62 shr ah, 1 ; Move error code and CF into proper position
63
64 pop di
65 pop bx
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 jnz .done
79 push ax
80 call AH9h_InitializeDriveForUse ; Reset Master and Slave (Master will come first in DPT list)
81 pop ax
82 jc .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
86 ret
87
Note: See TracBrowser for help on using the repository browser.