Hi Yasir I am doing PhD in configuring scratchpad memory I need the coding of the work u have done so that I can implement in my research Regards Tabbassum
Sent from my iPad > On 01-Dec-2017, at 8:45 PM, Qureshi Yasir Mahmood <[email protected]> > wrote: > > Hello All, > > I have recently been working on adding both data and instruction scratch Pad > (SPM) in GEM5 FS simulation. I was able to add both of them alongside with > having L1-I and L1-D cache. The memory system now looks as in figure at > https://imgur.com/a/wUtUX > > Since I am using FS mode, I can access the D-SPM and I-SPM using > open(“/dev/mem”) and mmap(). I-SPM is connected to both the instruction as > well as data port, so that we can write the program to it through data port > and execute and read through instruction port. > To test this, I compiled a helloworld program as a library which does not > print anything, but just returns an integer value. We access this library > through dlopen and the function in the library through dlsym. Then through > function pointer we copied the function to the I-SPM. Finally we jumped to > the function in I-SPM through a function pointer call. After this the program > gets stuck and does not proceed. > > In the stats file I can see the write accesses (to copy the function to) the > SPM issued by cpu.data, but I don’t see any read cpu.inst access to I-SPM. > Can someone suggest why the CPU does not read the I-SPM when I jump to the > function in it ? > > NOTE: When using mmap() I do enable PROT_EXEC to mark I-SPM as executable > memory region. > > Regards > Yasir > > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
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