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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/kernel/devicesegment.C $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2011,2015 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* 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 (device_offset >= (uint64_t)iv_mmioMap[idx].size)
{
return false;
}
PageTableManager::addEntry((i_addr / PAGESIZE) * PAGESIZE,
(iv_mmioMap[idx].addr + device_offset) / PAGESIZE,
(iv_mmioMap[idx].no_ci ?
(BYPASS_HRMOR | WRITABLE |
( iv_mmioMap[idx].guarded ? GUARDED : 0) ) :
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
* @param i_nonCI[in] - Device should be mapped cacheable instead of CI
* @param i_guarded[in] - Whether to prevent out-of-order acces to
* instructions or data in the segment. Ignored if CI.
* @return void* - Pointer to beginning virtual address, NULL otherwise
*/
void *DeviceSegment::devMap(void *ra, uint64_t i_devDataSize, bool i_nonCI,
bool i_guarded)
{
void *segBlock = NULL;
if (i_devDataSize <= THIRTYTWO_GB)
{
for (size_t i = 0; i < MMIO_MAP_DEVICES; i++)
{
if ((0 == iv_mmioMap[i].addr) && (0 == iv_mmioMap[i].size))
{
iv_mmioMap[i].no_ci = i_nonCI;
iv_mmioMap[i].guarded = i_guarded;
iv_mmioMap[i].size = i_devDataSize;
iv_mmioMap[i].addr = reinterpret_cast<uint64_t>(ra);
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();
size_t idx = segment_ea / ((1ull << SLBE_s) / MMIO_MAP_DEVICES);
if ((0 != iv_mmioMap[idx].addr) || (0 != iv_mmioMap[idx].size))
{
//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;
iv_mmioMap[idx].size = 0;
iv_mmioMap[idx].guarded = 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();
size_t idx = segment_ea / ((1ull << SLBE_s) / MMIO_MAP_DEVICES);
if ((0 != iv_mmioMap[idx].addr) || (0 != iv_mmioMap[idx].size))
{
//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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