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

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

--HG--
extra : convert_revision : 26826fb316f4cac900ec648fa268f1d95bc960f1

2 files changed, 394 insertions, 0 deletions

diff --git a/mem/physical.cc b/mem/physical.cc
new file mode 100644
index 000000000..c45e12750
--- /dev/null
+++ b/mem/physical.cc
@@ -0,0 +1,304 @@
+/*
+ * 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)
diff --git a/mem/physical.hh b/mem/physical.hh
new file mode 100644
index 000000000..5410024e5
--- /dev/null
+++ b/mem/physical.hh
@@ -0,0 +1,90 @@
+/*
+ * 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__