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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/usr/trace/bufferpage.C $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* COPYRIGHT International Business Machines Corp. 2012,2014 */
/* */
/* 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 "bufferpage.H"
#include <limits.h>
#include <stdlib.h>
#include <kernel/pagemgr.H>
namespace TRACE
{
Entry* BufferPage::claimEntry(size_t i_size)
{
uint64_t l_usedSize = this->usedSize;
// Verify there is enough space.
while ((usedSize + i_size) < (PAGESIZE - sizeof(BufferPage)))
{
// Atomically attempt to claim i_size worth.
uint64_t newSize = l_usedSize + i_size;
if (!__sync_bool_compare_and_swap(&this->usedSize,
l_usedSize,
newSize))
{
// Failed race to atomically update.
// Re-read size, try again.
l_usedSize = this->usedSize;
continue;
}
// Successful at claiming an entry, return pointer to it.
return reinterpret_cast<Entry*>(&this->data[0] + l_usedSize);
}
return NULL;
}
BufferPage* BufferPage::allocate(bool i_common)
{
BufferPage* page = NULL;
page = reinterpret_cast<BufferPage*>(PageManager::allocatePage());
memset(page, '\0', PAGESIZE);
if (i_common)
{
page->commonPage = 1;
}
return page;
}
void BufferPage::deallocate(BufferPage* i_page)
{
PageManager::freePage(i_page);
}
}
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