Re: [Gems-users] physical_address 0

["Dave Z." <zhu_dave@xxxxxxxxx>]

Yes, Simics is actually passing Ruby a physical address of 0. I have some kernel memory mmap'ed into my application. "ptr" points to the mmap'ed memory space, and I know the logical address of ptr. When I do ptr[offset] = value or value = ptr[offset], the physical addresses for the memory requests are always 0.

Thanks,
Dave

----- Original Message ----
From: Dan Gibson <degibson@xxxxxxxx>
To: Gems Users <gems-users@xxxxxxxxxxx>
Sent: Friday, January 19, 2007 2:35:14 PM
Subject: Re: [Gems-users] physical_address 0

I thought you were calling SIM_logical_to_physical to determine the physical address. Do you mean that Simics is actually passing Ruby a physical address of zero? If so, what is the ASI, and what type of access (eg store, atomic, etc.) is it?

Regards,
Dan

Dave Z. wrote:

But there is no SIM_logical_to_physical in SimicsProcessor::makeRequest. If I understand correctly, the order of function calls is ruby_operate (ruby.c), _possible_cache_miss (commands.C), makeRequest (SimicsDriver.C), makeRequest (SimicsProcessor.C). The physical address is always 0 for certain logical addresses.

Thanks,
Dave

----- Original Message ----
From: Dan Gibson <degibson@xxxxxxxx>
To: Gems Users <gems-users@xxxxxxxxxxx>
Sent: Thursday, January 18, 2007 8:16:58 PM
Subject: Re: [Gems-users] physical_address 0

You might want to check that SIM_logical_to_physical isn't raising any 
exceptions. Have a look at SIM_last_exception().

Regards,
Dan

Dave Z. wrote:

  

Hi,

I have a quick question about mem_trans object in SimicsProcessor::makeRequest. Is it something expected to have mem_trans->s.physical_address=0? I've printed the physical addresses of some logical addresses and they are all 0. Here is what I do:

if (mem_trans->s.logical_address == XXX)
   printf("logical address %x physical address %x\n", mem_trans->s.logical_address, mem_trans->s.physical_address);

Thanks,

Dave 





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