Handout

kernel/arch/cache.h

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+/*! \file
+ *  \brief Helper for cache alignment
+ */
+
+#pragma once
+
+#include "../debug/assert.h"
+
+// Helper for aligning to cache line (to prevent false sharing)
+#ifndef CACHE_LINE_SIZE
+#define CACHE_LINE_SIZE 64
+#endif
+#define cache_aligned alignas(CACHE_LINE_SIZE)
+
+/*!
+ *  \def assert_cache_aligned(TYPE)
+ *  \brief Compile time check of cache alignment
+ *  \param TYPE data type to check
+ */
+#define assert_cache_aligned(TYPE)                     \
+	static_assert(sizeof(TYPE) % CACHE_LINE_SIZE == 0, \
+				  STRINGIFY(TYPE) "Not aligned on cache boundary")