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

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l4m2

Joined: 15 Jan 2015
Posts: 670

l4m2 15 Feb 2015, 09:02

a complete 32-bit OS written wholly in fasm(to be a .img file)

15 Feb 2015, 09:02

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 15 Feb 2015, 10:30

Of course KolibriOS.

15 Feb 2015, 10:30

uor99

Joined: 04 Dec 2014
Posts: 42

uor99 16 Feb 2015, 00:05

And MenuetOS.

16 Feb 2015, 00:05

edfed

Joined: 20 Feb 2006
Posts: 4358
Location: Now

edfed 16 Feb 2015, 11:17

or foolos? Laughing

16 Feb 2015, 11:17

l4m2

Joined: 15 Jan 2015
Posts: 670

l4m2 16 Feb 2015, 13:18

JohnFound wrote:

Of course KolibriOS.

I found it not an OS made only with asm but with file packer...

16 Feb 2015, 13:18

Dex4u

Joined: 08 Feb 2005
Posts: 1601
Location: web

Dex4u 16 Feb 2015, 16:31

DexOS http://dex-os.github.io/

16 Feb 2015, 16:31

l4m2

Joined: 15 Jan 2015
Posts: 670

l4m2 16 Feb 2015, 16:32

edfed wrote:

or foolos?

foolos goes the best as i want!

16 Feb 2015, 16:32

l4m2

Joined: 15 Jan 2015
Posts: 670

l4m2 17 Feb 2015, 09:09

edfed wrote:

or foolos?

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?

17 Feb 2015, 09:09

edfed

Joined: 20 Feb 2006
Posts: 4358
Location: Now

edfed 17 Feb 2015, 09:55

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 ?

17 Feb 2015, 09:55

edfed

Joined: 20 Feb 2006
Posts: 4358
Location: Now

edfed 17 Feb 2015, 10:12

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

17 Feb 2015, 10:12

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