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Adding some more things toward having cpu->mem test in place. Still need to work on compilation issues.

Browse source 
mem/physical.cc:
mem/physical.hh:
    Added a stripped down version of the physical memory object

--HG--
extra : convert_revision : 26826fb316f4cac900ec648fa268f1d95bc960f1
This commit is contained in:
Ron Dreslinski 2006-02-03 14:54:37 -05:00
parent 4c40848dcc
commit 4e36678028
2 changed files with 394 additions and 0 deletions
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/*
* Copyright (c) 2001-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <zlib.h>
#include <cstdio>
#include <iostream>
#include <string>
#include "base/misc.hh"
#include "config/full_system.hh"
#if FULL_SYSTEM
#include "mem/functional/memory_control.hh"
#endif
#include "mem/functional/physical.hh"
#include "sim/host.hh"
#include "sim/builder.hh"
#include "targetarch/isa_traits.hh"
using namespace std;
#if FULL_SYSTEM
PhysicalMemory::PhysicalMemory(const string &n, Range<Addr> range,
MemoryController *mmu, const std::string &fname)
: FunctionalMemory(n), base_addr(range.start), pmem_size(range.size()),
pmem_addr(NULL)
{
if (pmem_size % TheISA::PageBytes != 0)
panic("Memory Size not divisible by page size\n");
mmu->add_child(this, range);
int fd = -1;
if (!fname.empty()) {
fd = open(fname.c_str(), O_RDWR | O_CREAT, 0644);
if (fd == -1) {
perror("open");
fatal("Could not open physical memory file: %s\n", fname);
}
ftruncate(fd, pmem_size);
}
int map_flags = (fd == -1) ? (MAP_ANON | MAP_PRIVATE) : MAP_SHARED;
pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE,
map_flags, fd, 0);
if (fd != -1)
close(fd);
if (pmem_addr == (void *)MAP_FAILED) {
perror("mmap");
fatal("Could not mmap!\n");
}
page_ptr = 0;
}
#endif
PhysicalMemory::PhysicalMemory(const string &n)
: FunctionalMemory(n), base_addr(0), pmem_addr(NULL)
{
// Hardcoded to 128 MB for now.
pmem_size = 1 << 27;
if (pmem_size % TheISA::PageBytes != 0)
panic("Memory Size not divisible by page size\n");
int map_flags = MAP_ANON | MAP_PRIVATE;
pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE,
map_flags, -1, 0);
if (pmem_addr == (void *)MAP_FAILED) {
perror("mmap");
fatal("Could not mmap!\n");
}
page_ptr = 0;
}
PhysicalMemory::~PhysicalMemory()
{
if (pmem_addr)
munmap(pmem_addr, pmem_size);
}
Addr
PhysicalMemory::new_page()
{
Addr return_addr = page_ptr << LogVMPageSize;
return_addr += base_addr;
++page_ptr;
return return_addr;
}
//
// little helper for better prot_* error messages
//
void
PhysicalMemory::prot_access_error(Addr addr, int size, const string &func)
{
panic("invalid physical memory access!\n"
"%s: %s(addr=%#x, size=%d) out of range (max=%#x)\n",
name(), func, addr, size, pmem_size - 1);
}
void
PhysicalMemory::prot_read(Addr addr, uint8_t *p, int size)
{
if (addr + size >= pmem_size)
prot_access_error(addr, size, "prot_read");
memcpy(p, pmem_addr + addr - base_addr, size);
}
void
PhysicalMemory::prot_write(Addr addr, const uint8_t *p, int size)
{
if (addr + size >= pmem_size)
prot_access_error(addr, size, "prot_write");
memcpy(pmem_addr + addr - base_addr, p, size);
}
void
PhysicalMemory::prot_memset(Addr addr, uint8_t val, int size)
{
if (addr + size >= pmem_size)
prot_access_error(addr, size, "prot_memset");
memset(pmem_addr + addr - base_addr, val, size);
}
void
PhysicalMemory::serialize(ostream &os)
{
gzFile compressedMem;
string filename = name() + ".physmem";
SERIALIZE_SCALAR(pmem_size);
SERIALIZE_SCALAR(filename);
// write memory file
string thefile = Checkpoint::dir() + "/" + filename.c_str();
int fd = creat(thefile.c_str(), 0664);
if (fd < 0) {
perror("creat");
fatal("Can't open physical memory checkpoint file '%s'\n", filename);
}
compressedMem = gzdopen(fd, "wb");
if (compressedMem == NULL)
fatal("Insufficient memory to allocate compression state for %s\n",
filename);
if (gzwrite(compressedMem, pmem_addr, pmem_size) != pmem_size) {
fatal("Write failed on physical memory checkpoint file '%s'\n",
filename);
}
if (gzclose(compressedMem))
fatal("Close failed on physical memory checkpoint file '%s'\n",
filename);
}
void
PhysicalMemory::unserialize(Checkpoint *cp, const string &section)
{
gzFile compressedMem;
long *tempPage;
long *pmem_current;
uint64_t curSize;
uint32_t bytesRead;
const int chunkSize = 16384;
// unmap file that was mmaped in the constructor
munmap(pmem_addr, pmem_size);
string filename;
UNSERIALIZE_SCALAR(pmem_size);
UNSERIALIZE_SCALAR(filename);
filename = cp->cptDir + "/" + filename;
// mmap memoryfile
int fd = open(filename.c_str(), O_RDONLY);
if (fd < 0) {
perror("open");
fatal("Can't open physical memory checkpoint file '%s'", filename);
}
compressedMem = gzdopen(fd, "rb");
if (compressedMem == NULL)
fatal("Insufficient memory to allocate compression state for %s\n",
filename);
pmem_addr = (uint8_t *)mmap(NULL, pmem_size, PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE, -1, 0);
if (pmem_addr == (void *)MAP_FAILED) {
perror("mmap");
fatal("Could not mmap physical memory!\n");
}
curSize = 0;
tempPage = (long*)malloc(chunkSize);
if (tempPage == NULL)
fatal("Unable to malloc memory to read file %s\n", filename);
/* Only copy bytes that are non-zero, so we don't give the VM system hell */
while (curSize < pmem_size) {
bytesRead = gzread(compressedMem, tempPage, chunkSize);
if (bytesRead != chunkSize && bytesRead != pmem_size - curSize)
fatal("Read failed on physical memory checkpoint file '%s'"
" got %d bytes, expected %d or %d bytes\n",
filename, bytesRead, chunkSize, pmem_size-curSize);
assert(bytesRead % sizeof(long) == 0);
for (int x = 0; x < bytesRead/sizeof(long); x++)
{
if (*(tempPage+x) != 0) {
pmem_current = (long*)(pmem_addr + curSize + x * sizeof(long));
*pmem_current = *(tempPage+x);
}
}
curSize += bytesRead;
}
free(tempPage);
if (gzclose(compressedMem))
fatal("Close failed on physical memory checkpoint file '%s'\n",
filename);
}
BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
Param<string> file;
#if FULL_SYSTEM
SimObjectParam<MemoryController *> mmu;
#endif
Param<Range<Addr> > range;
END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
INIT_PARAM_DFLT(file, "memory mapped file", ""),
#if FULL_SYSTEM
INIT_PARAM(mmu, "Memory Controller"),
#endif
INIT_PARAM(range, "Device Address Range")
END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
CREATE_SIM_OBJECT(PhysicalMemory)
{
#if FULL_SYSTEM
if (mmu) {
return new PhysicalMemory(getInstanceName(), range, mmu, file);
}
#endif
return new PhysicalMemory(getInstanceName());
}
REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory)

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/*
* Copyright (c) 2001-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* @file
*/
#ifndef __PHYSICAL_MEMORY_HH__
#define __PHYSICAL_MEMORY_HH__
#include "base/range.hh"
#include "mem/memory.hh"
//
// Functional model for a contiguous block of physical memory. (i.e. RAM)
//
class PhysicalMemory : public Memory
{
private:
// prevent copying of a MainMemory object
PhysicalMemory(const PhysicalMemory &specmem);
const PhysicalMemory &operator=(const PhysicalMemory &specmem);
protected:
Addr base_addr;
Addr pmem_size;
uint8_t *pmem_addr;
int page_ptr;
public:
Addr new_page();
uint64_t size() { return pmem_size; }
public:
PhysicalMemory(const std::string &n);
virtual ~PhysicalMemory();
protected:
// error handling for prot_* functions
void prot_access_error(Addr addr, int size, const std::string &func);
public:
// Read/Write arbitrary amounts of data to simulated memory space
virtual void prot_read(Addr addr, uint8_t *p, int size);
virtual void prot_write(Addr addr, const uint8_t *p, int size);
virtual void prot_memset(Addr addr, uint8_t val, int size);
// fast back-door memory access for vtophys(), remote gdb, etc.
uint64_t phys_read_qword(Addr addr) const;
public:
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string &section);
};
PhysicalMemory::phys_read_qword(Addr addr) const
{
if (addr + sizeof(uint64_t) > pmem_size)
return 0;
return *(uint64_t *)(pmem_addr + addr);
}
#endif //__PHYSICAL_MEMORY_HH__