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Index > OS Construction > cant find acpi

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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
Code:
mov ax,0
mov bx,0
more:
mov ds,ax




cmp word [0],'RS'
jne not_match
cmp word [2],'D '
jne not_match
cmp word [4],'PT'
jne not_match
cmp word [6],'R '
jne not_match

inc bx




not_match:

inc ax
cmp ax,0

jne more
jmp $    

0 matches, why?
Post 09 Aug 2010, 11:51
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Alphonso



Joined: 16 Jan 2007
Posts: 294
Alphonso
I tried your code in Bochs 2.4.5 under DOS and it worked Ok.


Last edited by Alphonso on 10 Aug 2010, 09:30; edited 1 time in total
Post 09 Aug 2010, 15:38
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DJ Mauretto



Joined: 14 Mar 2007
Posts: 464
Location: Rome,Italy
DJ Mauretto
Code:
 xor di,di
   mov bx,0f000h
       mov ds,bx

@@:

        cmp word [di],'RS'
        jne not_match
       cmp word [di+2],'D '
      jne not_match
       cmp word [di+4],'PT'
      jne not_match
       cmp word [di+6],'R '
      je  @found

not_match:

        add di,10h
  jnz @b

  'print not found'

@found:

  'print found'    ; ds:di = Address
    

_________________
Nil Volentibus Arduum Razz
Post 09 Aug 2010, 16:45
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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
i can find it in normal os (although last pointer is 0x00000000 wich i doubt is correct address).

i still cant find it under bochs, and it has acpi support. wtf. help me.
Post 09 Aug 2010, 19:54
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Alphonso



Joined: 16 Jan 2007
Posts: 294
Alphonso
Since your code works under DOS in bochs maybe your booting straight to your code and your print routine doesn't work. Hard to guess without further info.
Post 10 Aug 2010, 10:15
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cod3b453



Joined: 25 Aug 2004
Posts: 619
cod3b453
You should scan the first kB of the EBDA at 0x9FC00-0x9FFFF* and BIOS ROM at 0xE0000-0xFFFFF. The table should be aligned to a 16 byte boundary.

*or better still the segment given by word at 0x0040E in BDA
Post 10 Aug 2010, 12:12
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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
i am scanning everything < 1MB, its just not there :/ even on not aligned boundary. nothing!
Post 10 Aug 2010, 20:48
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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
bump
Post 27 Oct 2010, 18:23
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