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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 <assert.h>
#include <kernel/vmmmgr.H>
#include <kernel/ptmgr.H>
#include <kernel/devicesegment.H>
#include <kernel/segmentmgr.H>
#include <kernel/console.H>
/**
* @brief Add the device segment to the SegmentManager.
*/
void DeviceSegment::init(size_t segId)
{
kassert((segId >= SegmentManager::MMIO_FIRST_SEGMENT_ID) &&
(segId <= SegmentManager::MMIO_LAST_SEGMENT_ID));
SegmentManager::addSegment(this, segId);
}
/**
* @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,
SegmentManager::CI_ACCESS);
return true;
}
/**
* @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 *DeviceSegment::devMap(void *ra, uint64_t 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;
}
}
}
else
{
printk("Unsupported device segment size(0x%lX), ",i_devDataSize);
printk("for address 0x%lX\n",reinterpret_cast<uint64_t>(ra));
}
return segBlock;
}
int DeviceSegment::devUnmap(void *ea)
{
int rc = -EINVAL;
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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