[v3 04/24] eal/loongarch: add prefetch operations for LoongArch

[Min Zhou <zhoumin@loongson.cn>]

This patch adds architecture specific prefetch operations
for LoongArch architecture.

Signed-off-by: Min Zhou <zhoumin@loongson.cn>
---
 lib/eal/loongarch/include/rte_prefetch.h | 47 ++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 lib/eal/loongarch/include/rte_prefetch.h

diff --git a/lib/eal/loongarch/include/rte_prefetch.h b/lib/eal/loongarch/include/rte_prefetch.h
new file mode 100644
index 0000000000..0fd9262ea8
--- /dev/null
+++ b/lib/eal/loongarch/include/rte_prefetch.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Loongson Technology Corporation Limited
+ */
+
+#ifndef _RTE_PREFETCH_LOONGARCH_H_
+#define _RTE_PREFETCH_LOONGARCH_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_common.h>
+#include "generic/rte_prefetch.h"
+
+static inline void rte_prefetch0(const volatile void *p)
+{
+	__builtin_prefetch((const void *)(uintptr_t)p, 0, 3);
+}
+
+static inline void rte_prefetch1(const volatile void *p)
+{
+	__builtin_prefetch((const void *)(uintptr_t)p, 0, 2);
+}
+
+static inline void rte_prefetch2(const volatile void *p)
+{
+	__builtin_prefetch((const void *)(uintptr_t)p, 0, 1);
+}
+
+static inline void rte_prefetch_non_temporal(const volatile void *p)
+{
+	/* non-temporal version not available, fallback to rte_prefetch0 */
+	rte_prefetch0(p);
+}
+
+__rte_experimental
+static inline void
+rte_cldemote(const volatile void *p)
+{
+	RTE_SET_USED(p);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_PREFETCH_LOONGARCH_H_ */
-- 
2.31.1