flat assembler - MikeOS32 - 32 bit PM translation

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Mike Gonta

Joined: 26 Dec 2010
Posts: 240
Location: the-ideom

Mike Gonta

This is the 16 bit real mode MikeOS translated to run as 32 bit protected mode.

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Mike Gonta
one man's journey of discovery in the-ideom

https://the-ideom.com

Last edited by Mike Gonta on 05 Dec 2016, 10:49; edited 13 times in total

28 Dec 2010, 02:48

Domi2Show

Joined: 11 Jan 2011
Posts: 1

Domi2Show

Hey,

can you Zip all files together so that i can download it?
sry, i am German Wink

Edit: thank you Smile

11 Jan 2011, 17:57

tom tobias

Joined: 09 Sep 2003
Posts: 1320
Location: usa

tom tobias

Thank you Mike, well done.

Smile

13 Jan 2011, 22:34

roboman

Joined: 03 Dec 2006
Posts: 122
Location: USA

roboman

I like MikeOS, did a translation of MikeOS Basic to DexOS. I hadn't thought about the idea of making a 32 or 64 bit ver of MikeOS. Taking a quick look at the source and your line "aeBIOS - case study - MikeOS" this only runs after you start aeBIOS, right?

03 Mar 2011, 04:48

Mike Gonta

Joined: 26 Dec 2010
Posts: 240
Location: the-ideom

Mike Gonta

Here is the latest version of MikeOS32 (and the latest version of aeBIOS)

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Mike Gonta
one man's journey of discovery in the-ideom

https://the-ideom.com

Last edited by Mike Gonta on 10 Jun 2014, 10:09; edited 1 time in total

02 Aug 2013, 17:13

dogman

Joined: 18 Jul 2013
Posts: 114

dogman

Mike Gonta wrote:

Mike Gonta
look and see - many look but few see

http://mikegonta.com

How true! I looked at your website but couldn't see anything Razz

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05 Aug 2013, 09:37

Shirk

Joined: 12 Sep 2011
Posts: 10

Shirk

Quote:

look and see --- many look but few see

Nice one - you should add a "if you can read this you don't need prescription glasses"
but what are TWOTHBRUSHES??

19 Aug 2013, 09:57

sid123

Joined: 30 Jul 2013
Posts: 339
Location: Asia, Singapore

sid123

If this is really Protected Mode then I think that you could access more than 64K of memory right? Question

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21 Aug 2013, 10:10

Mike Gonta

Joined: 26 Dec 2010
Posts: 240
Location: the-ideom

Mike Gonta

sid123 wrote:

If this is really Protected Mode ...

That's very simple to verify.

Code:

use32 ; PM32
org 0x400000 ; MikeOS32 loads apps to 4Mb
times 0x80000 db 0x90 ; NOP - file size at least 1/2 Mb
  mov esi, hello ; 32 bit registers
  call print
  mov ah, 0x10
  int 0x16 ; standard BIOS functions
  ret
print:
  mov ah, 0x0E
.1:
  mov al, [esi]
  lea esi, [esi+1]
  test al, al
  je .2
  int 0x10
  jmp .1
.2:
  ret
hello: db "This is a big app!", 0

Assemble this as big_app.bin, copy to the root directory, boot MikeOS32, select it from the menu and press any key to go back to MikeOS32.

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Mike Gonta
one man's journey of discovery in the-ideom

https://the-ideom.com

21 Aug 2013, 20:35

sid123

Joined: 30 Jul 2013
Posts: 339
Location: Asia, Singapore

sid123

Mike Gonta wrote:

sid123 wrote:

If this is really Protected Mode ...

That's very simple to verify.

Code:

use32 ; PM32
org 0x400000 ; MikeOS32 loads apps to 4Mb
times 0x80000 db 0x90 ; NOP - file size at least 1/2 Mb
  mov esi, hello ; 32 bit registers
  call print
  mov ah, 0x10
  int 0x16 ; standard BIOS functions
  ret
print:
  mov ah, 0x0E
.1:
  mov al, [esi]
  lea esi, [esi+1]
  test al, al
  je .2
  int 0x10
  jmp .1
.2:
  ret
hello: db "This is a big app!", 0

Assemble this as big_app.bin, copy to the root directory, boot MikeOS32, select it from the menu and press any key to go back to MikeOS32.

AWESOME!
That's great Mike Gonta
As Mike Saunders made MikeOS-16
Mike Gonta takes it to 32.... Razz

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"Those who can make you believe in absurdities can make you commit atrocities" -- Voltaire https://github.com/Benderx2/R3X
XD

24 Aug 2013, 12:30

z0q

Joined: 17 Mar 2015
Posts: 3

z0q

I have a question about the bootloader. How does it look for the file? It first looks in the root directory and then reads the FAT?

I'm not sure if I understand correctly how this works.

Any help is greatly appreciated Smile

13 Jun 2015, 20:35

Mike Gonta

Joined: 26 Dec 2010
Posts: 240
Location: the-ideom

Mike Gonta

z0q wrote:

I have a question about the bootloader. How does it look for the file? It first looks in the root directory and then
reads the FAT?

The file name is found by checking each root directory entry in the root directory table one entry at a time. That
root entry contains the first cluster of the file. That cluster number is used to locate the next cluster number in
the FAT and so on until the last one is found and loaded.
https://en.wikipedia.org/wiki/Design_of_the_FAT_file_system

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Mike Gonta
one man's journey of discovery in the-ideom

https://the-ideom.com

14 Jun 2015, 08:24

z0q

Joined: 17 Mar 2015
Posts: 3

z0q

Thank you very much Smile

I have another question. I could not find in the comments why it starts in 32-bit mode. Could you explain this to me? I thought bootloaders always start in real mode.

14 Jun 2015, 12:19

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