MBR: relocation minimization

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Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8095
Location: Kraków, Poland

Tomasz Grysztar 06 Mar 2009, 09:49

Yes, that's a risky thing to do.
BTW, what do we know about IF on entry from BIOS? Because the only safe way to move stack when IF=1 is to use LSS.

06 Mar 2009, 09:49

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19067
Location: In your JS exploiting you and your system

revolution 06 Mar 2009, 09:58

You can also use the two instruction sequence -

Code:

mov ss,something
mov sp,anotherThing

CPU ignores interrupts for one instruction cycle after the mov ss

06 Mar 2009, 09:58

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8095
Location: Kraków, Poland

Tomasz Grysztar 06 Mar 2009, 10:35

Oh, right, that was working already on 8086. Only on 8088 it was bugged. Smile

06 Mar 2009, 10:35

bitRAKE

Joined: 21 Jul 2003
Posts: 3548
Location: vpcmipstrm

bitRAKE 06 Mar 2009, 17:01

I wonder how many computers boot daily with various MBRs?

06 Mar 2009, 17:01

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19067
Location: In your JS exploiting you and your system

revolution 06 Mar 2009, 17:10

I wonder how many computers stay on 24/7 and boot rarely?

06 Mar 2009, 17:10

bitRAKE

Joined: 21 Jul 2003
Posts: 3548
Location: vpcmipstrm

bitRAKE 06 Mar 2009, 17:40

Having tried to educate problem about the various power/time saving techniques, I can tell you that it is not as successful as I'd like it to be. I cringe watching someone at the coffee shop spend 5 minutes to close all their work and shutdown Windows.

<ah, another topic branch - I've got that MBR here somewhere under this stack of windows...>

06 Mar 2009, 17:40

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