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Assembly Language... anyone?? - 4/1/2008 1:50:21 PM

yfki

Posts: 27
Score: 0
Joined: 12/12/2007
Status: offline

Some assembly code that I am trying to understand, just thought I would throw tihs out there..
I am trying to get this to work on Vista x64

Any assebly people out there?

; FANCTRL.ASM
; The fan control functions; extracted from NBFAN.MDM and NBSVC.MDM from 
; the Dell Diagnostics 1052

; Authors: Some unknown Dell engineers using Visual C++; stripped down
;          and optimized by MH ;-)

.386p
.model flat

extrn _printf:near

public _hlcontrol

.code
;--------------------------------------
; _hlcontrol: high level fan control
;
;  In: D[EBP+8]:Fan No (0=outer,1=inner)
;      D[EBP+12]:Speed (2=high,1=slow,0=off)
; Out: 1:ok 0:error
;--------------------------------------

_hlcontrol:
       push ebp
       mov ebp,esp
       sub esp,32
       push ebx
       push esi
       push edi
       
       mov eax,dword ptr [ebp+12]
       mov eax,dword ptr [4*eax+speed]
       push eax            ; 3. arg: speed text
       mov eax,dword ptr [ebp+8]
       mov eax,dword ptr [4*eax+fan]
       push eax            ; 2. arg: fan no
       push offset setspeed        ; 1. arg: format string
       call _printf
       add esp,12

mov eax,dword ptr [ebp+12]    ; fan speed
       push eax
       mov eax,dword ptr [ebp+8]    ; fan no
       push eax
       call genfanstruct
       add esp,8
       cmp eax,1
       je @a5
   
   push offset err1
   call _printf
   add esp,4
   xor eax,eax
   
;---------
@a5:    pop edi
       pop esi
       pop ebx
       leave
       ret

;--------------------------------------
; genfanstruct: create smbios structure for fan control
;
;  In: D[EBP+8]:Fan No (0=outer,1=inner)
;      D[EBP+12]:Speed (2=high,1=slow,0=off)
; Out: 1:ok <>1:error
;--------------------------------------
genfanstruct:
       push ebp
       mov ebp, esp
       sub esp, 20h
       push ebx
       push esi
       push edi
       mov byte ptr [ebp-1Ch],0a3h
       mov byte ptr [ebp-1Bh],1
       mov al,byte ptr [ebp+8]
       mov byte ptr [ebp-18h],al
       mov al,byte ptr [ebp+12]
       mov byte ptr [ebp-17h],al
       mov word ptr [ebp-14h],0
       mov word ptr [ebp-10h],0
       lea eax,dword ptr [ebp-1Ch]
       push eax
       call smbiosfct
       add esp,4
       pop edi
       pop esi
       pop ebx
       leave
       ret

;--------------------------------------
; smbiosfct: execute commands in smbios structure
;
;  In: D[EBP+8]:Pointer to smbios structure
; Out: 1:ok <>1:error
;--------------------------------------
smbiosfct:
       push ebp
       mov ebp, esp
       sub esp, 14h
       push ebx
       push esi
       push edi
       mov word ptr [ebp-10h], 1
       mov eax, dword ptr [ebp+8]
       mov ax, word ptr [eax]
       mov word ptr [ebp-14h], ax
       mov eax, dword ptr [ebp+8]
       mov ax, word ptr [eax+4]
       mov word ptr [ebp-4], ax
       mov eax, dword ptr [ebp+8]
       mov ax, word ptr [eax+8]
       mov word ptr [ebp-8], ax
       mov eax, dword ptr [ebp+8]
       mov ax, word ptr [eax+0Ch]
       mov word ptr [ebp-0Ch], ax
       pushad
       mov ax, word ptr [ebp-14h]
       mov bx, word ptr [ebp-4]
       mov cx, word ptr [ebp-8]
       mov dx, word ptr [ebp-0Ch]
       out 0b2h, al
       out 084h, al
       mov word ptr [ebp-14h], ax
       mov word ptr [ebp-4], bx
       mov word ptr [ebp-8], cx
       mov word ptr [ebp-0Ch], dx
       popad
       mov eax, dword ptr [ebp+8]
       xor ecx, ecx
       mov cx, word ptr [eax]
       mov eax, dword ptr [ebp-14h]
       and eax, 0000FFFFh
       cmp ecx, eax
       jne @c1
       mov eax, dword ptr [ebp+8]
       xor ecx, ecx
       mov cx, word ptr [eax+4]
       mov eax, dword ptr [ebp-4]
       and eax, 0000FFFFh
       cmp ecx, eax
       jne @c1
       mov eax, dword ptr [ebp+8]
       xor ecx, ecx
       mov cx, word ptr [eax+8]
       mov eax, dword ptr [ebp-8]
       and eax, 0000FFFFh
       cmp ecx, eax
       jne @c1
       mov eax, dword ptr [ebp+8]
       xor ecx, ecx
       mov cx, word ptr [eax+0Ch]
       mov eax, dword ptr [ebp-0Ch]
       and eax, 0000FFFFh
       cmp ecx, eax
       jne @c1
       push offset svc52A8
       call _printf
       add esp, 4
       mov word ptr [ebp-10h], 0
;---------
@c1:    mov eax, dword ptr [ebp-14h]
       and eax, 0000FFFFh
       cmp eax, 0000FFFFh
       jne @c2
       mov eax, dword ptr [ebp+8]
       xor ecx, ecx
       mov cl, byte ptr [eax+4]
       push ecx
       push offset svc52DC
       call _printf
       add esp, 8
       mov word ptr [ebp-10h], 0
;---------
@c2:    mov ax, word ptr [ebp-14h]
       mov ecx, dword ptr [ebp+8]
       mov word ptr [ecx], ax
       mov ax, word ptr [ebp-4]
       mov ecx, dword ptr [ebp+8]
       mov word ptr [ecx+4], ax
       mov ax, word ptr [ebp-8]
       mov ecx, dword ptr [ebp+8]
       mov word ptr [ecx+8], ax
       mov ax, word ptr [ebp-0Ch]
       mov ecx, dword ptr [ebp+8]
       mov word ptr [ecx+0Ch], ax
       movsx eax, word ptr [ebp-10h]
       test eax, eax
       je @c4
       mov eax, 1
       jmp @c5
;---------
@c4:    mov eax, 5
;---------
@c5:    pop edi
       pop esi
       pop ebx
       leave
       ret
   
;******************************************************
.data
err1    db 'Failed to set fan speed',13,10,0

setspeed db 'Setting %s fan to %s',13,10,0

speed   dd offset off
       dd offset slow
       dd offset high

fan    dd offset right
   dd offset left
   
left    db 'inner',0
right   db 'outer',0

high    db 'high',0
slow    db 'slow',0
off     db 'off',0

svc52A8    db 'Smbios: Function not supported somehow..',13,10,0
svc52DC db 'Smbios: Invalid device (%d)',13,10,0

;******************************************************
end

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