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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/kernel/devicesegment.C $
//
// 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
#include <util/singleton.H>
#include <limits.h>
#include <kernel/vmmmgr.H>
#include <kernel/ptmgr.H>
#include <kernel/devicesegment.H>
#include <kernel/segmentmgr.H>
#define SLBE_s 40
#include <kernel/console.H>
/**
* STATIC
* @brief Add the device segment
*/
void DeviceSegment::init()
{
Singleton<DeviceSegment>::instance()._init();
}
/**
* @brief DEPRECATED
*/
void* DeviceSegment::mmioMap(void* ra, size_t pages)
{
return Singleton<DeviceSegment>::instance()._mmioMap(ra, pages);
}
/**
* @brief DEPRECATED
*/
int DeviceSegment::mmioUnmap(void* ea, size_t pages)
{
return Singleton<DeviceSegment>::instance()._mmioUnmap(ea, pages);
}
/**
* STATIC
* @brief Map a device into the device segment(2TB)
*/
void* DeviceSegment::devMap(void *ra, SEG_DATA_SIZES i_devDataSize)
{
return Singleton<DeviceSegment>::instance()._devMap(ra,i_devDataSize);
}
/**
* STATIC
* @brief Unmap a device from the device segment(2TB)
*/
int DeviceSegment::devUnmap(void *ea)
{
return Singleton<DeviceSegment>::instance()._devUnmap(ea);
}
/**
* @brief Add the device segment
*/
void DeviceSegment::_init()
{
SegmentManager::addSegment(this, SegmentManager::MMIO_SEGMENT_ID);
}
/**
* @brief Handle a page fault for a device address access
* @param i_task[in] - Task pointer to the task requiring the page
* @param i_addr[in] - 64-bit address needed to be paged
* @return bool - TRUE: Page added to page table
* FALSE: Not a valid address to be paged
*/
bool DeviceSegment::handlePageFault(task_t* i_task, uint64_t i_addr)
{
//Verify input address falls within this segment's address range
if (i_addr < this->getBaseAddress() ||
i_addr >= (this->getBaseAddress() + (1ull << SLBE_s)))
{
return false;
}
//Verify the device is mapped
uint64_t segment_ea = i_addr - this->getBaseAddress();
size_t idx = segment_ea / ((1ull << SLBE_s) / MMIO_MAP_DEVICES);
uint64_t device_offset = segment_ea -
(idx * (1ull << SLBE_s) / MMIO_MAP_DEVICES);
if (0 == iv_mmioMap[idx].addr ||
device_offset >= (uint64_t)iv_mmioMap[idx].size)
{
return false;
}
PageTableManager::addEntry((i_addr / PAGESIZE) * PAGESIZE,
(iv_mmioMap[idx].addr + device_offset) / PAGESIZE,
VmmManager::CI_ACCESS);
return true;
}
/**
* @brief DEPRECATED
*/
void* DeviceSegment::_mmioMap(void* ra, size_t pages)
{
for (size_t i = 0; i < MMIO_MAP_DEVICES; i++)
{
if (0 == iv_mmioMap[i].addr)
{
iv_mmioMap[i].size = THIRTYTWO_GB;
iv_mmioMap[i].addr = reinterpret_cast<uint64_t>(ra);
return reinterpret_cast<void*>(i *
((1ull << SLBE_s) / MMIO_MAP_DEVICES) +
this->getBaseAddress());
}
}
return NULL;
}
/**
* @brief DEPRECATED
*/
int DeviceSegment::_mmioUnmap(void* ea, size_t pages)
{
uint64_t segment_ea = reinterpret_cast<uint64_t>(ea) -
this->getBaseAddress();
size_t idx = segment_ea / ((1ull << SLBE_s) / MMIO_MAP_DEVICES);
if (0 != iv_mmioMap[idx].addr)
{
PageTableManager::delRangePN(iv_mmioMap[idx].addr / PAGESIZE,
iv_mmioMap[idx].addr / PAGESIZE +
pages);
iv_mmioMap[idx].addr = 0;
return 0;
}
return -1;
}
/**
* @brief Map a device into the device segment(2TB)
* @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 *DeviceSegment::_devMap(void *ra, SEG_DATA_SIZES i_devDataSize)
{
void *segBlock = NULL;
if (i_devDataSize <= THIRTYTWO_GB)
{
//TODO - Use segment block size if/when new device size needed
for (size_t i = 0; i < MMIO_MAP_DEVICES; i++)
{
if (0 == iv_mmioMap[i].addr)
{
iv_mmioMap[i].size = i_devDataSize;
iv_mmioMap[i].addr = reinterpret_cast<uint64_t>(ra);
//TODO - Use segment block size if/when new device size needed
segBlock = reinterpret_cast<void*>(i *
((1ull << SLBE_s) / MMIO_MAP_DEVICES) +
this->getBaseAddress());
break;
}
}
if (segBlock == NULL)
{
printk("Unable to map device, no empty segment blocks found\n");
}
}
else
{
printk("Unsupported device segment size(0x%lX), ",i_devDataSize);
printk("for address 0x%lX\n",reinterpret_cast<uint64_t>(ra));
}
return segBlock;
}
/**
* @brief Unmap a device from the device segment(2TB)
* @param ea[in] - Void pointer to effective address
* @return int - 0 for successful unmap, non-zero otherwise
*/
int DeviceSegment::_devUnmap(void *ea)
{
int rc = -1;
uint64_t segment_ea = reinterpret_cast<uint64_t>(ea);
//Verify input address falls within this segment's address range
if (segment_ea < this->getBaseAddress() ||
segment_ea >= (this->getBaseAddress() + (1ull << SLBE_s)))
{
return rc;
}
segment_ea = segment_ea - this->getBaseAddress();
//TODO - Calculate idx by segment block size if/when new device size needed
size_t idx = segment_ea / ((1ull << SLBE_s) / MMIO_MAP_DEVICES);
if (0 != iv_mmioMap[idx].addr)
{
//Remove all of the defined block's size (<= 32GB)
PageTableManager::delRangePN(iv_mmioMap[idx].addr / PAGESIZE,
(iv_mmioMap[idx].addr + iv_mmioMap[idx].size) / PAGESIZE);
iv_mmioMap[idx].addr = 0;
rc = 0;
}
return rc;
}
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