linux-kernel - [PATCH RFC 09/10] tools: Add common infrastructure for byte swapping

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Date:	Tue, 10 Jun 2014 16:13:13 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, linux-arch@...r.kernel.org
Cc:	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH RFC 09/10] tools: Add common infrastructure for byte swapping

Common selection infrastructure for picking the best byte swap method.

Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
 tools/include/tools/unaligned/be_swap.h | 15 +++++++++++++++
 tools/include/tools/unaligned/le_swap.h | 15 +++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 tools/include/tools/unaligned/be_swap.h
 create mode 100644 tools/include/tools/unaligned/le_swap.h

diff --git a/tools/include/tools/unaligned/be_swap.h b/tools/include/tools/unaligned/be_swap.h
new file mode 100644
index 000000000000..f0effb8fc6ca
--- /dev/null
+++ b/tools/include/tools/unaligned/be_swap.h
@@ -0,0 +1,15 @@
+#ifndef TOOLS_BE_SWAP_H
+#define TOOLS_BE_SWAP_H
+
+#ifdef htole64
+/* Prefer the <endian.h> infrastructure if it exists */
+# include <tools/unaligned/be_endian.h>
+#elif TOOLS_UNALIGNED_GCC >= 0x040800
+/* This version of gcc is new enough to have __builtin_bswap*() */
+# include <tools/unaligned/be_bswap.h>
+#else
+/* This always works */
+# include <tools/unaligned/be_byteshift.h>
+#endif
+
+#endif /* TOOLS_BE_SWAP_H */
diff --git a/tools/include/tools/unaligned/le_swap.h b/tools/include/tools/unaligned/le_swap.h
new file mode 100644
index 000000000000..8952723c1dff
--- /dev/null
+++ b/tools/include/tools/unaligned/le_swap.h
@@ -0,0 +1,15 @@
+#ifndef TOOLS_LE_SWAP_H
+#define TOOLS_LE_SWAP_H
+
+#ifdef htobe64
+/* Prefer the <endian.h> infrastructure if it exists */
+# include <tools/unaligned/le_endian.h>
+#elif TOOLS_UNALIGNED_GCC >= 0x040800
+/* This version of gcc is new enough to have __builtin_bswap*() */
+# include <tools/unaligned/le_bswap.h>
+#else
+/* This always works */
+# include <tools/unaligned/le_byteshift.h>
+#endif
+
+#endif /* TOOLS_LE_SWAP_H */
-- 
1.9.3

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