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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. 2011,2012 */
/* */
/* 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 */
#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,
bool i_store)
{
//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,
false);
iv_mmioMap[idx].addr = 0;
rc = 0;
}
return rc;
}
/**
* Locate the physical address of the given virtual address
*/
uint64_t DeviceSegment::findPhysicalAddress(uint64_t i_vaddr) const
{
uint64_t rc = -EFAULT;
uint64_t segment_ea = i_vaddr;
//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)
{
//memory offset within this device's window
uint64_t offset = segment_ea - idx*((1ull << SLBE_s) / MMIO_MAP_DEVICES);
return (iv_mmioMap[idx].addr + offset);
}
return rc;
}
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