[okl4-developer] problems with physical memory access from an iguana example

[Geoffrey Lee]

On Sat, May 24, 2008 at 04:27:20PM -0700, Gabi Voiculescu wrote:
> Hello
> 
> I am trying to access a few register sets directly from an iguana example build on top of the OKL4 2.1 'empty' example.
> 
> I have tried using hardware_back_memsection without success. I have also seen a previous post on this matter:
> http://lists.okl4.org/pipermail/developer/2008-February/000607.html 
> and tried to apply the same rules to my weaver.xml. Obtained the file below. That does not map the physical page(s) either.
> 
> My problem is that I don't see the sections added in the page table, and the mapping_test function does not work.

Hi Gabi

The way I find easiest is to call memsection_create_user() and
then hardware_back_memsection().  From what I can see in your code
you haven't called memsection_create_user() prior to calling
hardware_back_memsection().  Maybe that is the cause of your
problem?

	-gl


> 
> On top of that, whenever I change something in the code machines.py gets overwritten with a file that has nothing defined in the <program_name section of the weaver file. I have to execute my build script twice, copying the weaver.xml back into build/images/ the second time to have the images build correctly.
> 
> q0: Is hardware_back_memsection usefull in the OKL4 2.1? It always returns an error -1 when I try to use it in my example user application. I have tried the following code, not having the physical memory region premapped in the kernel (plat.cc) or in machies.py.
> 
> struct etm_struct
> {
>     memsection_ref_t ms;
>     uintptr_t ms_base;
> };
> ....
>     struct etm_struct etm;
>     int res;
>     res = hardware_back_memsection(etm.ms, 0x10132000, L4_IOMemory);
> 
> 
> q1: Is the above mentioned email procedure still valid in OKL4 2.1?
> 
> q2: what am I doing wrong in weaver.xml?
> 
> q3: Do I need to modify machines.py or the SConstruct file from iguana/examples/empty folder to keep weaver.xml unchanged when I change my code?
> 
> q4: Where do I need to modify so that the 
> <memsection name= ..../>
> lines don't disappear each time I change a file. 
> 
> From what I can see adding more memory['xxx'] = [Region(....)] in machines.py only creates entries for 
> 
> <physical_memory name= ....
>        ....
>  </physical_memory>
> 
> and 
> 
>   <physical_pool name= ....
>       ....
>    </physical_pool>
> 
> and not for the memsection entries for my user program
> 
> <memsection name = ....>
> 
> 
> Thank you,
> Gabi Voiculescu
> 
> 
> --------------------------------------------------------------------------------------------------------------
> weaver.xml file:
> <?xml version="1.0"?>
> <!DOCTYPE image SYSTEM "weaver-1.1.dtd">
> <image>
>   <machine>
>     <word_size size="0x20" />
>     <virtual_memory name="virtual">
>       <region base="0x1000" size="0xdffff000" />
>     </virtual_memory>
>     <physical_memory name="physical">
>       <region base="0x100000" size="0x7eff000" type="conventional" />
>     </physical_memory>
>     <physical_memory name="etm_mem">
>       <region base="0x10132000" size="0x1000" />
>     </physical_memory>
>     <physical_memory name="meter_mem">
>       <region base="0xc0000000" size="0x1000" />
>     </physical_memory>
>     <physical_memory name="meter_ram_mem">
>       <region base="0xe0000000" size="0x1000" />
>     </physical_memory>
>     <physical_memory name="tpiu_mem">
>       <region base="0x10135000" size="0x1000" />
>     </physical_memory>   
>     <page_size size="0x1000" />
>     <page_size size="0x10000" />
>     <page_size size="0x100000" />
>   </machine>
> 
>   <virtual_pool name="virtual">
>     <memory src="virtual" />
>   </virtual_pool>
>   
>   <physical_pool name="physical" direct="true">
>     <memory src="physical" />
>   </physical_pool>
> 
>   <physical_pool name="etm_pool" direct="true">
>     <memory src="etm_mem" />
>   </physical_pool>  
>   <physical_pool name="meter_pool" direct="true">
>     <memory src="meter_mem" />
>   </physical_pool>
>   <physical_pool name="meter_ram_pool" direct="true">
>     <memory src="meter_ram_mem" />
>   </physical_pool>
>   <physical_pool name="tpiu_pool" direct="true">
>     <memory src="tpiu_mem" />
>   </physical_pool>
>   
>   <kernel file="/tst/port_2.1/build/pistachio/bin/kernel" xip="false" >
>     <dynamic max_threads="0x400" />
>     <config>
>       <option key="root_caps" value="1024"/>
>     </config>
>   </kernel>
> 
>   <rootprogram file="/tst/port_2.1/build/iguana_server/bin/ig_server" virtpool="virtual" physpool="physical" >
>   </rootprogram>
> 
>   <program name="empty_example" file="/tst/port_2.1/build/iguana/bin/empty_example" >
>     <memsection name="etm_memsect" size="0x1000" physpool="etm_pool" />
>     <memsection name="tpiu_memsect" size="0x1000" physpool="tpiu_pool" />
>     <memsection name="meter_memsect" size="0x1000" physpool="meter_pool" />
>     <memsection name="meter_ram_memsect" size="0x1000" physpool="meter_ram_pool" />
>   </program>
> 
> </image>
> 
> 
>        
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