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-/*
- * Copyright (c) 2009 Mark D. Hill and David A. Wood
- * 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.
- */
-
-#ifndef __MEM_RUBY_SYSTEM_MEMORYVECTOR_HH__
-#define __MEM_RUBY_SYSTEM_MEMORYVECTOR_HH__
-
-#include "base/trace.hh"
-#include "debug/RubyCacheTrace.hh"
-#include "mem/ruby/common/Address.hh"
-
-class DirectoryMemory;
-
-/**
- * MemoryVector holds memory data (DRAM only)
- */
-class MemoryVector
-{
- public:
- MemoryVector();
- MemoryVector(uint64 size);
- ~MemoryVector();
- friend class DirectoryMemory;
-
- void resize(uint64 size); // destructive
-
- void write(const Address & paddr, uint8_t *data, int len);
- uint8_t *read(const Address & paddr, uint8_t *data, int len);
- uint32_t collatePages(uint8_t *&raw_data);
- void populatePages(uint8_t *raw_data);
-
- private:
- uint8_t *getBlockPtr(const PhysAddress & addr);
-
- uint64 m_size;
- uint8_t **m_pages;
- uint32_t m_num_pages;
- const uint32_t m_page_offset_mask;
- static const uint32_t PAGE_SIZE = 4096;
-};
-
-inline
-MemoryVector::MemoryVector()
- : m_page_offset_mask(4095)
-{
- m_size = 0;
- m_num_pages = 0;
- m_pages = NULL;
-}
-
-inline
-MemoryVector::MemoryVector(uint64 size)
- : m_page_offset_mask(4095)
-{
- resize(size);
-}
-
-inline
-MemoryVector::~MemoryVector()
-{
- for (int i = 0; i < m_num_pages; i++) {
- if (m_pages[i] != 0) {
- delete [] m_pages[i];
- }
- }
- delete [] m_pages;
-}
-
-inline void
-MemoryVector::resize(uint64 size)
-{
- if (m_pages != NULL){
- for (int i = 0; i < m_num_pages; i++) {
- if (m_pages[i] != 0) {
- delete [] m_pages[i];
- }
- }
- delete [] m_pages;
- }
- m_size = size;
- assert(size%PAGE_SIZE == 0);
- m_num_pages = size >> 12;
- m_pages = new uint8_t*[m_num_pages];
- memset(m_pages, 0, m_num_pages * sizeof(uint8_t*));
-}
-
-inline void
-MemoryVector::write(const Address & paddr, uint8_t *data, int len)
-{
- assert(paddr.getAddress() + len <= m_size);
- uint32_t page_num = paddr.getAddress() >> 12;
- if (m_pages[page_num] == 0) {
- bool all_zeros = true;
- for (int i = 0; i < len;i++) {
- if (data[i] != 0) {
- all_zeros = false;
- break;
- }
- }
- if (all_zeros)
- return;
- m_pages[page_num] = new uint8_t[PAGE_SIZE];
- memset(m_pages[page_num], 0, PAGE_SIZE);
- uint32_t offset = paddr.getAddress() & m_page_offset_mask;
- memcpy(&m_pages[page_num][offset], data, len);
- } else {
- memcpy(&m_pages[page_num][paddr.getAddress()&m_page_offset_mask],
- data, len);
- }
-}
-
-inline uint8_t*
-MemoryVector::read(const Address & paddr, uint8_t *data, int len)
-{
- assert(paddr.getAddress() + len <= m_size);
- uint32_t page_num = paddr.getAddress() >> 12;
- if (m_pages[page_num] == 0) {
- memset(data, 0, len);
- } else {
- memcpy(data, &m_pages[page_num][paddr.getAddress()&m_page_offset_mask],
- len);
- }
- return data;
-}
-
-inline uint8_t*
-MemoryVector::getBlockPtr(const PhysAddress & paddr)
-{
- uint32_t page_num = paddr.getAddress() >> 12;
- if (m_pages[page_num] == 0) {
- m_pages[page_num] = new uint8_t[PAGE_SIZE];
- memset(m_pages[page_num], 0, PAGE_SIZE);
- }
- return &m_pages[page_num][paddr.getAddress()&m_page_offset_mask];
-}
-
-/*!
- * Function for collating all the pages of the physical memory together.
- * In case a pointer for a page is NULL, this page needs only a single byte
- * to represent that the pointer is NULL. Otherwise, it needs 1 + PAGE_SIZE
- * bytes. The first represents that the page pointer is not NULL, and rest of
- * the bytes represent the data on the page.
- */
-
-inline uint32_t
-MemoryVector::collatePages(uint8_t *&raw_data)
-{
- uint32_t num_zero_pages = 0;
- uint32_t data_size = 0;
-
- for (uint32_t i = 0;i < m_num_pages; ++i)
- {
- if (m_pages[i] == 0) num_zero_pages++;
- }
-
- raw_data = new uint8_t[sizeof(uint32_t) /* number of pages*/ +
- m_num_pages /* whether the page is all zeros */ +
- PAGE_SIZE * (m_num_pages - num_zero_pages)];
-
- /* Write the number of pages to be stored. */
- memcpy(raw_data, &m_num_pages, sizeof(uint32_t));
- data_size = sizeof(uint32_t);
-
- DPRINTF(RubyCacheTrace, "collating %d pages\n", m_num_pages);
-
- for (uint32_t i = 0;i < m_num_pages; ++i)
- {
- if (m_pages[i] == 0) {
- raw_data[data_size] = 0;
- } else {
- raw_data[data_size] = 1;
- memcpy(raw_data + data_size + 1, m_pages[i], PAGE_SIZE);
- data_size += PAGE_SIZE;
- }
- data_size += 1;
- }
-
- return data_size;
-}
-
-/*!
- * Function for populating the pages of the memory using the available raw
- * data. Each page has a byte associate with it, which represents whether the
- * page was NULL or not, when all the pages were collated. The function assumes
- * that the number of pages in the memory are same as those that were recorded
- * in the checkpoint.
- */
-inline void
-MemoryVector::populatePages(uint8_t *raw_data)
-{
- uint32_t data_size = 0;
- uint32_t num_pages = 0;
-
- /* Read the number of pages that were stored. */
- memcpy(&num_pages, raw_data, sizeof(uint32_t));
- data_size = sizeof(uint32_t);
- assert(num_pages == m_num_pages);
-
- DPRINTF(RubyCacheTrace, "Populating %d pages\n", num_pages);
-
- for (uint32_t i = 0;i < m_num_pages; ++i)
- {
- assert(m_pages[i] == 0);
- if (raw_data[data_size] != 0) {
- m_pages[i] = new uint8_t[PAGE_SIZE];
- memcpy(m_pages[i], raw_data + data_size + 1, PAGE_SIZE);
- data_size += PAGE_SIZE;
- }
- data_size += 1;
- }
-}
-
-#endif // __MEM_RUBY_SYSTEM_MEMORYVECTOR_HH__
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