Add support for remembering deconfigs without GUARD

 Currently on reconfig reboots only parts that are GUARDed
 are remembered and reapplied.
   - Add suport for a semi persisent PNOR partition,
     HB_VOLATILE which Hostboot uses to keep track of the reconfig
     reboots vs power off
   - Add a new GUARD type specifically for reconfig loops
   - Add RECALL_DECONFIG_ON_RECONFIG config flag to control
     what gets added to GUARD partition
   - During boot will add/clear guard records on deconfig based
     on config flags and semi persisent state.

Change-Id: Iec636058cde8095c0c4216d1f95ae4fda554395e
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/39780
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Reviewed-by: William G. Hoffa <wghoffa@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Stephen M. Cprek <smcprek@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/src/include/usr/util/utilsemipersist.H b/src/include/usr/util/utilsemipersist.H
new file mode 100644
index 000000000..82943825e
--- /dev/null
+++ b/src/include/usr/util/utilsemipersist.H
@@ -0,0 +1,83 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/include/usr/util/utilsemipersist.H $                      */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2012,2017                        */
+/* [+] 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                                                     */
+#ifndef UTILSEMIPERSIST_H
+#define UTILSEMIPERSIST_H
+
+/**
+ * @file utilsemipersist.H
+ *
+ * @brief Utilies to access the semi persistent memory
+ *
+ *
+ */
+
+/*****************************************************************************/
+// I n c l u d e s
+/*****************************************************************************/
+
+// Utility Includes
+
+/*****************************************************************************/
+// Forwards
+/*****************************************************************************/
+
+//*****************************************************************************/
+// C o n s t a n t s
+/*****************************************************************************/
+namespace Util
+{
+    enum
+    {
+        PERSIST_MAGIC           =       0x48425f56, // HB_V
+    };
+
+    struct semiPersistData_t
+    {
+        uint32_t magic;         //HB_V
+        uint32_t reboot_cnt;    // Number of reboots with valid data
+        semiPersistData_t(): magic(0), reboot_cnt(0) {};
+    } PACKED;
+
+    /**
+     * @brief This function writes data structure to the HB semi persistent
+     *  region.  Data is flushed to storage once this call returns
+     * @param[in] i_data        Structure to write
+     *
+     * @return none
+     */
+    void writeSemiPersistData(const semiPersistData_t i_data);
+
+    /**
+     * @brief This function reads data structure from the HB semi persistent
+     *  region.  If the region cannot be found it will return 0s for all data.
+     *  User must check magic header to know if data is valid
+     * @param[in] o_data        Structure to read
+     *
+     * @return none
+     */
+    void readSemiPersistData(semiPersistData_t & o_data);
+};
+
+#endif //UTILMEM_H