mem_pool.cc

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/*
 * Copyright (c) 2011-2021 Advanced Micro Devices, Inc.
 * All rights reserved.
 *
 * For use for simulation and test purposes only
 *
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 * modification, are permitted provided that the following conditions are met:
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 * this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 */
 
#include "sim/mem_pool.hh"
 
#include "sim/system.hh"
 
namespace gem5
{
 
MemPool::MemPool(System *system, Addr ptr, Addr limit)
        : sys(system), freePageNum(ptr >> sys->getPageShift()),
        _totalPages(limit >> sys->getPageShift())
{
}
 
Counter
MemPool::freePage() const
{
    return freePageNum;
}
 
void
MemPool::setFreePage(Counter value)
{
    freePageNum = value;
}
 
Addr
MemPool::freePageAddr() const
{
    return freePageNum << sys->getPageShift();
}
 
Counter
MemPool::totalPages() const
{
    return _totalPages;
}
 
Counter
MemPool::allocatedPages() const
{
    return freePageNum;
}
 
Counter
MemPool::freePages() const
{
    return _totalPages - freePageNum;
}
 
Addr
MemPool::allocatedBytes() const
{
    return allocatedPages() << sys->getPageShift();
}
 
Addr
MemPool::freeBytes() const
{
    return freePages() << sys->getPageShift();
}
 
Addr
MemPool::totalBytes() const
{
    return totalPages() << sys->getPageShift();
}
 
Addr
MemPool::allocate(Addr npages)
{
    Addr return_addr = freePageAddr();
    freePageNum += npages;
    Addr next_return_addr = freePageAddr();
 
    if (sys->m5opRange().valid() &&
        next_return_addr >= sys->m5opRange().start()) {
        warn("Reached m5ops MMIO region\n");
        return_addr = sys->m5opRange().end();
        freePageNum = (return_addr >> sys->getPageShift()) + npages;
    }
 
    fatal_if((freePages() <= 0), "Out of memory, "
             "please increase size of physical memory.");
 
    return return_addr;
}
 
} // namespace gem5