PEL: Add function to generate unique PEL IDs

Create generatePELID() to return a unique 4B PEL ID every time it is
called. It will start at a base value, and then increment by 1 each
time.  It uses a file to save the next value to use.

This will be used by the PEL handling code to create unique values
for the error log ID field in the Private Header section.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I841a8dcc5dc48e2b663004be3dccfb114ba366f2

1 files changed, 47 insertions, 0 deletions

diff --git a/extensions/openpower-pels/log_id.hpp b/extensions/openpower-pels/log_id.hpp
new file mode 100644
index 0000000..21f04eb
--- /dev/null
+++ b/extensions/openpower-pels/log_id.hpp
@@ -0,0 +1,47 @@
+#pragma once
+
+#include <cstdint>
+
+namespace openpower
+{
+namespace pels
+{
+
+namespace detail
+{
+
+/**
+ * @brief Adds the 1 byte log creator prefix to the log ID
+ *
+ * @param[in] id - the ID to add it to
+ *
+ * @return - the full log ID
+ */
+uint32_t addLogIDPrefix(uint32_t id);
+
+/**
+ * @brief Generates a PEL ID based on the current time.
+ *
+ * Used for error scenarios where the normal method doesn't
+ * work in order to get a unique ID still.
+ *
+ * @return A unique log ID.
+ */
+uint32_t getTimeBasedLogID();
+
+} // namespace detail
+
+/**
+ * @brief Generates a unique PEL log entry ID every time
+ *        it is called.
+ *
+ * This ID is used at offset 0x2C in the Private Header
+ * section of a PEL.  For single BMC systems, it must
+ * start with 0x50.
+ *
+ * @return uint32_t - The log ID
+ */
+uint32_t generatePELID();
+
+} // namespace pels
+} // namespace openpower