Hi Dengning,
You should take a look at the ASPLOS tutorial and video. In it we
describe the process, but in simple terms the py files are processed
and turned into header files which defile things like
PhysicalMemoryParams. The actual processed files are in the build
directory. If you add parameters to PhysicalMemory.py they will be
automatically added to PhysicalMemoryParams and you'll be able to
access them from the Params struct. The stub at the bottom is used to
create an instance of PhysicalMemory passing in the Parameters. In
this case it does nothing, but it some cases it does more (e.g. Caches).
Ali
On Jul 28, 2008, at 5:13 AM, 邓宁 wrote:
> hi all,
> i am quite confused about the mechanism of parameters configuration
> bw .py and .cc files...
> i.e. in src/mem/physical.cc
> PhysicalMemory::PhysicalMemory(const Params *p)
> : MemObject(p), pmemAddr(NULL), lat(p->latency)
> {
> if (params()->range.size() % TheISA::PageBytes != 0)
> panic("Memory Size not divisible by page size\n");
>
> int map_flags = MAP_ANON | MAP_PRIVATE;
> pmemAddr = (uint8_t *)mmap(NULL, params()->range.size(),
> PROT_READ | PROT_WRITE, map_flags,
> -1, 0);
>
> if (pmemAddr == (void *)MAP_FAILED) {
> perror("mmap");
> fatal("Could not mmap!\n");
> }
>
> ...
> }
>
> i see it is a process to accept some parameters from src/mem/
> physicalMemory.py, yet i don't know how to...
> class PhysicalMemory(MemObject): type = 'PhysicalMemory'
> port = VectorPort("the access port")
> range = Param.AddrRange(AddrRange('128MB'), "Device Address")
> file = Param.String('', "memory mapped file")
> latency = Param.Latency('1t', "latency of an access")
> zero = Param.Bool(False, "zero initialize memory")
> i haven't find the declaration of PhysicalMemoryParams and what 's
> the result of this function as follows?
> PhysicalMemory *
> PhysicalMemoryParams::create()
> {
> return new PhysicalMemory(this);
> }
> can anyone plz show me the path of the maze? thanks a lot...
> --
> Regards
> Dengning
>
> School Of Computer Science and Technology
> Beijng Institute of Technology, China, 100081
> [EMAIL PROTECTED]
> [EMAIL PROTECTED]
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