Physical memory allocation to L4linux

Masti Ramya Jayaram rmasti at inf.ethz.ch
Tue Sep 9 18:03:11 CEST 2014


Hey Martin,

I would like to explain my situation better. Here is what I intend:

a. What is the lowest module (bootstrap, fiasco, sigma, moe, ned,l4linux) that can be confined not access a portion of the address space?
I know that bootstrap and fiasco run in privileged mode, so there is no way to stop them. What is the next module?

b. Assuming that it is sigma, I would like to do the following:
 Have three regions in the physical address space (not necessarily memory): 

i) one for bootstrap, fiasco 
ii) moe, ned, sigma, l4linux
iii). Special region accessible only from (i) - bootstrap and fiasco.

If it is not possible to confine sigma, i.e., "hide a portion of the address space from it", then add sigma to lists (i,iii) and remove it from (ii) - and so on for the other modules.

If it is moe, could my goal be reached by adding an IO device as a blocker but then not give moe the corresponding capability?

Sorry for the confusion and thanks a lot for your help,
Ramya
________________________________________
From: l4-hackers [l4-hackers-bounces at os.inf.tu-dresden.de] on behalf of Masti  Ramya Jayaram [rmasti at inf.ethz.ch]
Sent: 09 September 2014 13:18
To: Martin Schröder; l4-hackers at os.inf.tu-dresden.de
Subject: RE: Physical memory allocation to L4linux

Hey Martin,

thanks for that tip. How do I use this device for L4linux though (and only for it)? I am not sure where memory allocation occurs when L4linux faults or if it is pre-allocated completely to L4linux.

Best,
ramya
________________________________________
From: l4-hackers [l4-hackers-bounces at os.inf.tu-dresden.de] on behalf of Martin Schröder [martin.schroeder at openlimit.com]
Sent: 09 September 2014 11:56
To: l4-hackers at os.inf.tu-dresden.de
Subject: Re: Physical memory allocation to L4linux

Hi Ramya,

Am 09.09.2014 um 11:39 schrieb Masti Ramya Jayaram:
> Hi all,
>
> I start l4linux by specifying 64M on memory in its configuration file. I would like this memory to be a fixed  range of physical memory and I was wondering if there is a way to do it.

MYRAM => new Device() {
   .hid= "myram";
   new-res Mmio(0x10000000 .. 0x13FFFFFF, 0xC000);
}

[http://os.inf.tu-dresden.de/pipermail/l4-hackers/2014/006617.html]


Best regards,
    Martin.



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