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Index > OS Construction > Who can give me a complete 32-bit OS written wholly in fasm?

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l4m2



Joined: 15 Jan 2015
Posts: 657
l4m2
a complete 32-bit OS written wholly in fasm(to be a .img file)
Post 15 Feb 2015, 09:02
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JohnFound



Joined: 16 Jun 2003
Posts: 3502
Location: Bulgaria
JohnFound
Of course KolibriOS.
Post 15 Feb 2015, 10:30
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uor99



Joined: 04 Dec 2014
Posts: 42
uor99
And MenuetOS.
Post 16 Feb 2015, 00:05
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edfed



Joined: 20 Feb 2006
Posts: 4242
Location: 2018
edfed
or foolos? Laughing
Post 16 Feb 2015, 11:17
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l4m2



Joined: 15 Jan 2015
Posts: 657
l4m2
JohnFound wrote:
Of course KolibriOS.

I found it not an OS made only with asm but with file packer...
Post 16 Feb 2015, 13:18
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u
Post 16 Feb 2015, 16:31
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l4m2



Joined: 15 Jan 2015
Posts: 657
l4m2
edfed wrote:
or foolos? Laughing

foolos goes the best as i want!
Post 16 Feb 2015, 16:32
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l4m2



Joined: 15 Jan 2015
Posts: 657
l4m2
edfed wrote:
or foolos? Laughing

Quote:
Code:
align 4
align 2
idtr    df @f-idt-1:idt
idt:
        dw isr0,sys_code,0x8E00,0
        dw isr1,sys_code,0x8E00,0
        dw isr2,sys_code,0x8E00,0    

So what do the two "Align"s do?
Post 17 Feb 2015, 09:09
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edfed



Joined: 20 Feb 2006
Posts: 4242
Location: 2018
edfed
align the idt on a 4 bytes range cause idtr is 6 bytes

it was a noob optimisation, not sure it is really usefull.
maybe we can prefer a

Code:
align 4
dw ?
idtr df ?
    
Post 17 Feb 2015, 09:55
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edfed



Joined: 20 Feb 2006
Posts: 4242
Location: 2018
edfed
please note, the real mode to protected mode and gdt management is based on code from Dex4u Smile

very usefull stuff to have real mode and protected mode sharing the same memory Wink
Post 17 Feb 2015, 10:12
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