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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/include/kernel/segment.H $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2011
//
// p1
//
// Object Code Only (OCO) source materials
// Licensed Internal Code Source Materials
// IBM HostBoot Licensed Internal Code
//
// The source code for this program is not published or other-
// wise divested of its trade secrets, irrespective of what has
// been deposited with the U.S. Copyright Office.
//
// Origin: 30
//
// IBM_PROLOG_END
/** @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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