1 files changed, 88 insertions, 0 deletions

diff --git a/include/linux/byteorder/pdp_endian.h b/include/linux/byteorder/pdp_endian.h
new file mode 100644
index 000000000000..618631cbc6e3
--- /dev/null
+++ b/include/linux/byteorder/pdp_endian.h
@@ -0,0 +1,88 @@
+#ifndef _LINUX_BYTEORDER_PDP_ENDIAN_H
+#define _LINUX_BYTEORDER_PDP_ENDIAN_H
+
+/*
+ * Could have been named NUXI-endian, but we use the same name as in glibc.
+ * hopefully only the PDP and its evolutions (old VAXen in compatibility mode)
+ * should ever use this braindead byteorder.
+ * This file *should* work, but has not been tested.
+ *
+ * little-endian is 1234; big-endian is 4321; nuxi/pdp-endian is 3412
+ *
+ * I thought vaxen were NUXI-endian, but was told they were correct-endian
+ * (little-endian), though indeed there existed NUXI-endian machines
+ * (DEC PDP-11 and old VAXen in compatibility mode).
+ * This makes this file a bit useless, but as a proof-of-concept.
+ *
+ * But what does a __u64 look like: is it 34127856 or 78563412 ???
+ * I don't dare imagine! Hence, no 64-bit byteorder support yet.
+ * Hopefully, there 64-bit pdp-endian support shouldn't ever be required.
+ *
+ */
+
+#ifndef __PDP_ENDIAN
+#define __PDP_ENDIAN 3412
+#endif
+#ifndef __PDP_ENDIAN_BITFIELD
+#define __PDP_ENDIAN_BITFIELD
+#endif
+
+#include <linux/byteorder/swab.h>
+#include <linux/byteorder/swabb.h>
+
+#define __constant_htonl(x) ___constant_swahb32((x))
+#define __constant_ntohl(x) ___constant_swahb32((x))
+#define __constant_htons(x) ___constant_swab16((x))
+#define __constant_ntohs(x) ___constant_swab16((x))
+#define __constant_cpu_to_le64(x) I DON'T KNOW
+#define __constant_le64_to_cpu(x) I DON'T KNOW
+#define __constant_cpu_to_le32(x) ___constant_swahw32((x))
+#define __constant_le32_to_cpu(x) ___constant_swahw32((x))
+#define __constant_cpu_to_le16(x) ((__u16)(x)
+#define __constant_le16_to_cpu(x) ((__u16)(x)
+#define __constant_cpu_to_be64(x) I DON'T KNOW
+#define __constant_be64_to_cpu(x) I DON'T KNOW
+#define __constant_cpu_to_be32(x) ___constant_swahb32((x))
+#define __constant_be32_to_cpu(x) ___constant_swahb32((x))
+#define __constant_cpu_to_be16(x) ___constant_swab16((x))
+#define __constant_be16_to_cpu(x) ___constant_swab16((x))
+#define __cpu_to_le64(x) I DON'T KNOW
+#define __le64_to_cpu(x) I DON'T KNOW
+#define __cpu_to_le32(x) ___swahw32((x))
+#define __le32_to_cpu(x) ___swahw32((x))
+#define __cpu_to_le16(x) ((__u16)(x)
+#define __le16_to_cpu(x) ((__u16)(x)
+#define __cpu_to_be64(x) I DON'T KNOW
+#define __be64_to_cpu(x) I DON'T KNOW
+#define __cpu_to_be32(x) __swahb32((x))
+#define __be32_to_cpu(x) __swahb32((x))
+#define __cpu_to_be16(x) __swab16((x))
+#define __be16_to_cpu(x) __swab16((x))
+#define __cpu_to_le64p(x) I DON'T KNOW
+#define __le64_to_cpup(x) I DON'T KNOW
+#define __cpu_to_le32p(x) ___swahw32p((x))
+#define __le32_to_cpup(x) ___swahw32p((x))
+#define __cpu_to_le16p(x) (*(__u16*)(x))
+#define __le16_to_cpup(x) (*(__u16*)(x))
+#define __cpu_to_be64p(x) I DON'T KNOW
+#define __be64_to_cpup(x) I DON'T KNOW
+#define __cpu_to_be32p(x) __swahb32p((x))
+#define __be32_to_cpup(x) __swahb32p((x))
+#define __cpu_to_be16p(x) __swab16p((x))
+#define __be16_to_cpup(x) __swab16p((x))
+#define __cpu_to_le64s(x) I DON'T KNOW
+#define __le64_to_cpus(x) I DON'T KNOW
+#define __cpu_to_le32s(x) ___swahw32s((x))
+#define __le32_to_cpus(x) ___swahw32s((x))
+#define __cpu_to_le16s(x) do {} while (0)
+#define __le16_to_cpus(x) do {} while (0)
+#define __cpu_to_be64s(x) I DON'T KNOW
+#define __be64_to_cpus(x) I DON'T KNOW
+#define __cpu_to_be32s(x) __swahb32s((x))
+#define __be32_to_cpus(x) __swahb32s((x))
+#define __cpu_to_be16s(x) __swab16s((x))
+#define __be16_to_cpus(x) __swab16s((x))
+
+#include <linux/byteorder/generic.h>
+
+#endif /* _LINUX_BYTEORDER_PDP_ENDIAN_H */