Re: [seL4] Devel Digest, Vol 77, Issue 11

29 Oct 2020

      Thanks Damon for your help!
I've added the required "simple" attribute to the assembly configuration:
assembly {
    composition {
        [...]
        component Client client;
    }

    configuration {
        [....]
        client.simple = true;
    }
}

But the usage generates:
implicit declaration of function ‘camkes_make_simple’
and I don't know what header(s) I should include and/or any library I
should link to get ‘camkes_make_simple’  decl/def.
camkes_make_simple() function does not exist in any of simple
camkes tutorials to figure out the required headers, while your example has
too many headers to figure out what headers are really needed.
Further help with it is greatly appreciated. Thanks.
Chris

On Thu, Oct 29, 2020 at 4:36 PM  wrote:
...
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Today's Topics:
1. seL4_BootInfo in Camkes environment (Chris Koziarz)
   2. Re: seL4_BootInfo in Camkes environment
      (Lee, Damon (Data61, Kensington NSW))
   3. Re: raspberry pi 4 (Jose A. Pascual)
----------------------------------------------------------------------
Message: 1
Date: Thu, 29 Oct 2020 13:39:12 +1100
From: Chris Koziarz 
To: devel@sel4.systems
Subject: [seL4] seL4_BootInfo in Camkes environment
Message-ID:

Content-Type: text/plain; charset="UTF-8"
In a regular seL4 PD, I always have seL4_BootInfo available
via platsupport_get_bootinfo(), and all goodies that I can learn from
therein are available.
But it appears that the camkes components (probably we should talk about
"client components", i.e. the ones with "control;" attribute and an entry
point: int run(void)),
are started as a typical root task, with a call:
  void __sel4_start_root(seL4_BootInfo *boot_info)
however boot_info is passed herein as NULL.
At least  boot_info appears NULL for me on ARM64.
So, is the access to  seL4_BootInfo disallowed in camkes env? Or how can I
access  seL4_BootInfo in camkes?
Chris
------------------------------
Message: 2
Date: Thu, 29 Oct 2020 04:28:56 +0000
From: "Lee, Damon (Data61, Kensington NSW)"

To: "devel@sel4.systems" 
Subject: Re: [seL4] seL4_BootInfo in Camkes environment
Message-ID: 
Content-Type: text/plain; charset="iso-8859-1"
Hi Chris,
...
In a regular seL4 PD, I always have seL4_BootInfo available
via platsupport_get_bootinfo(), and all goodies that I can learn
from
therein are available.
But it appears that the camkes components (probably we should
talk about
"client components", i.e. the ones with "control;" attribute and
an entry
point: int run(void)),
are started as a typical root task, with a call:
  void __sel4_start_root(seL4_BootInfo *boot_info)
however boot_info is passed herein as NULL.
At least  boot_info appears NULL for me on ARM64.
So, is the access to  seL4_BootInfo disallowed in camkes env? Or
how can I
access  seL4_BootInfo in camkes?
The bootinfo isn't disallowed in a CAmkES environment but parts of
it
is gutted out (untyped information, IRQ control cap etc.)
depending on
the configuration of the CAmkES application. To access the
bootinfo,
you could append this configuration option for a specific
component in
the "configuration" block in the ".camkes" file of your
application:
.simple = true;
The simple_t interface which abstracts the bootinfo can then be
grabbed via the 'camkes_make_simple()' function.
There are examples of the bootinfo usage in our CAmkES VM
repositories
that you can checkout here:
https://github.com/seL4/camkes-vm/blob/master/components/VM_Arm/src/main.c#L...
Regards,
Damon
------------------------------
Message: 3
Date: Thu, 29 Oct 2020 06:45:16 +0100
From: "Jose A. Pascual" 
To: Nick Spinale 
Cc: Sachin More , "devel@sel4.systems"

Subject: Re: [seL4] raspberry pi 4
Message-ID:

Content-Type: text/plain; charset="UTF-8"
Hi,
We are also running seL4 on the RPI4  and we managed to run "sel4test"
passing all the tests.
Basically, you can build the sel4test project and execute all the tests
without errors as in the Rpi3.
We are using it in an OS course to build a very simple OS on top of seL4.
I'll try to open a PR in the following days.
Nick, if you don't mind, I'll compare our patch with yours to check if we
are doing everything the same way.
I'll keep you informed.
Jose (& Mikel)
On Thu, Oct 29, 2020 at 1:29 AM Nick Spinale  wrote:
...
...
Can I prepare, say seL4 11.0 and then apply your patches and then
compile using seL4's build system (or your build system if it is in
public
domain)?
At the moment, I?m unable to share the rest of the code for this
particular project. I have, however, published our Raspberry Pi 4-related
patches to public branches of 'seL4' [1] and ?seL4_tools' [2]. These
patches, which are the extent of our Raspberry Pi 4-related patches for
upstream seL4 repositories, only encompasses the bootloader (?elfloader?)
and the seL4 kernel itself. The projects that you might use for getting
started, such as ?sel4test? [3], depend on platform support for userland
libraries such as those found in ?seL4_libs? [4].
If you decide to add Raspberry Pi 4 support to those userland libraries,
I?d be happy to help out with that.
[1] https://github.com/nspin/seL4/tree/rpi4
[2] https://github.com/nspin/seL4_tools/tree/rpi4
[3] https://github.com/seL4/sel4test-manifest
[4] https://github.com/seL4/seL4_libs
- - - -
Nick Spinale (nickspinale.com)
Arm Research, Cambridge UK
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