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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/include/kernel/segment.H $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* COPYRIGHT International Business Machines Corp. 2011,2014 */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
/** @file segment.H
* @brief Contains the definition of the virtual Segment class.
*/
#ifndef __KERNEL_SEGMENT_H
#define __KERNEL_SEGMENT_H
#include <kernel/task.H>
#include <errno.h>
#include <kernel/ptmgr.H>
/** @class Segment
* @brief Virtual segment class to handle virtual memory management within
* a 1TB segment.
*/
class Segment
{
public:
/**
* @brief Constructor.
* @param[in] i_baseAddr - Base [virtual] address of this segment.
*/
explicit Segment(uint64_t i_baseAddr) : iv_baseAddress(i_baseAddr) {};
/**
* @brief Destructor.
* No additional action necessary.
*/
virtual ~Segment() {};
/**
* @brief Responsible for handling page faults within the segment.
*
* @param[in] i_task - Task causing the page fault.
* @param[in] i_addr - Effective address accessed to cause fault.
* @param[in] i_store - The fault was due to a store.
*
* @return true - Page fault was successfully handled.
*
* If the page fault is not successfully handled the expectation is
* that the VMM will perform appropriate action, such as killing the
* task.
*/
virtual bool handlePageFault(task_t* i_task, uint64_t i_addr,
bool i_store) = 0;
/**
* @brief Get the base address of this segment.
* @return Base address (as uint64_t).
*/
uint64_t getBaseAddress() const { return iv_baseAddress; };
/**
* @brief Locate the physical address of the given virtual address
* @param[in] i_vaddr virtual address
* @return the physical address bound to the virtual address,
* or -EFAULT if i_vaddr not found. @see errno.h
*/
virtual uint64_t findPhysicalAddress(uint64_t i_vaddr) const { return -EFAULT; };
/**
* @brief Update LRU statistics on the block that owns the address
*
* @param[in] i_vaddr - Virtual Address of page
* @param[in] i_stats - Usage statistics
*/
virtual void updateRefCount( uint64_t i_vaddr,
PageTableManager::UsageStats_t i_stats )
{
//default to a NOOP
return;
};
/**
* @brief Cast out older physical memory pages
* @param[in] i_type Constraint @see VmmManager::castOutPages
*/
virtual void castOutPages(uint64_t i_type) {} // default to NOOP
protected:
/** The base address of the segment. */
const uint64_t iv_baseAddress;
};
#endif
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