1 files changed, 79 insertions, 0 deletions
diff --git a/src/usr/trace/bufferpage.C b/src/usr/trace/bufferpage.C
new file mode 100644
index 000000000..b4e655980
--- /dev/null
+++ b/src/usr/trace/bufferpage.C
@@ -0,0 +1,79 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/usr/trace/bufferpage.C $                                  */
+/*                                                                        */
+/* IBM CONFIDENTIAL                                                       */
+/*                                                                        */
+/* COPYRIGHT International Business Machines Corp. 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 "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);
+    }
+
+}