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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/include/kernel/devicesegment.H $ */
/* */
/* IBM CONFIDENTIAL */
/* */
/* COPYRIGHT International Business Machines Corp. 2011,2012 */
/* */
/* 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 otherwise */
/* divested of its trade secrets, irrespective of what has been */
/* deposited with the U.S. Copyright Office. */
/* */
/* Origin: 30 */
/* */
/* IBM_PROLOG_END_TAG */
#ifndef __KERNEL_DEVICESEGMENT_H
#define __KERNEL_DEVICESEGMENT_H
#include <kernel/segment.H>
#include <sys/mmio.h>
#include <usr/vmmconst.h>
/**
* @class DeviceSegment
* @brief Manages the device virtual memory segment
*/
class DeviceSegment : public Segment
{
public:
/**
* @brief Constructor (Device segment at 2TB + N)
*
* @param[in] segId - Segment ID to map this device segment at.
*
* Associates itself with the SegmentManager.
*/
explicit DeviceSegment(size_t segId) : Segment(segId * VMM_SEGMENT_SIZE)
{ init(segId); };
/**
* @brief Destructor
*/
~DeviceSegment() {};
/**
* @brief Add the device segment to the SegmentManager.
*/
void init(size_t segId);
/**
* @brief Handle a page fault for a device address access
* @param[in] i_task - Task pointer to the task requiring the page
* @param[in] i_addr - 64-bit address needed to be paged
* @param[in] i_store - Fault was due to a store.
* @return bool - true: Page added to page table
* false: Not a valid address to be paged
*/
bool handlePageFault(task_t* i_task, uint64_t i_addr, bool i_store);
/**
* @brief Map a device into the device segment.
* @param ra[in] - Void pointer to real address to be mapped in
* @param i_devDataSize[in] - Size of device segment block
* @return void* - Pointer to beginning virtual address, NULL otherwise
*/
void* devMap(void* ra, uint64_t i_devDataSize);
/**
* @brief Unmap a device from the device segment.
* @param ea[in] - Void pointer to effective address
* @return int - 0 for successful unmap, non-zero otherwise
*/
int devUnmap(void* ea);
/**
* @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
*/
uint64_t findPhysicalAddress(uint64_t i_vaddr) const;
private:
/**
* Attributes to represent a mapped device within a segment block
*/
struct devSegData
{
uint64_t addr; /* Real address assigned to device */
uint64_t size; /* A particular device's segment block size */
devSegData(): addr(0),size(THIRTYTWO_GB){};
};
/**
* Number of devices that can be mapped with a given segment block size
*/
enum
{
MMIO_MAP_DEVICES = 32
}; //TODO - Only necessary if a device uses a SCOM region other than 32GB
devSegData iv_mmioMap[MMIO_MAP_DEVICES];
/**
* @brief Add the device segment
*/
void _init();
};
#endif
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