1 files changed, 54 insertions, 0 deletions
diff --git a/include/endian.h b/include/endian.h
new file mode 100644
index 0000000..42f880c
--- /dev/null
+++ b/include/endian.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * endian.h - byte order swaps. arm64 and ppc64le are both little
+ * endian, so the macros compile to nothing there, but the big endian
+ * fallbacks stay so a BE target builds without a rewrite.
+ *
+ * Copyright (C) 2026 Bradley Morgan <brads@mainlining.org>
+ */
+
+#ifndef __ENDIAN_H
+#define __ENDIAN_H
+
+#include <stdint.h>
+
+static inline uint16_t __swap16(uint16_t x)
+{
+	return (uint16_t)((x << 8) | (x >> 8));
+}
+
+static inline uint32_t __swap32(uint32_t x)
+{
+	return ((x << 24) |
+		((x & 0xff00) << 8) |
+		((x & 0xff0000) >> 8) |
+		(x >> 24));
+}
+
+static inline uint64_t __swap64(uint64_t x)
+{
+	return ((uint64_t)__swap32((uint32_t)x) << 32) |
+	       __swap32((uint32_t)(x >> 32));
+}
+
+#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+
+#define le16_to_cpu(x)	__swap16(x)
+#define le32_to_cpu(x)	__swap32(x)
+#define le64_to_cpu(x)	__swap64(x)
+#define cpu_to_le16(x)	__swap16(x)
+#define cpu_to_le32(x)	__swap32(x)
+#define cpu_to_le64(x)	__swap64(x)
+
+#else
+
+#define le16_to_cpu(x)	(x)
+#define le32_to_cpu(x)	(x)
+#define le64_to_cpu(x)	(x)
+#define cpu_to_le16(x)	(x)
+#define cpu_to_le32(x)	(x)
+#define cpu_to_le64(x)	(x)
+
+#endif
+
+#endif