From fd5b62edfefca95ae2dfe9bd477a8f64271cd2e3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ciro=20Santilli=20=E5=85=AD=E5=9B=9B=E4=BA=8B=E4=BB=B6=20?=
 =?UTF-8?q?=E6=B3=95=E8=BD=AE=E5=8A=9F?= <ciro.santilli@gmail.com>
Date: Sat, 22 Jun 2019 00:00:02 +0000
Subject: [PATCH] x86 asm: move bswap from x86-assembly-cheat

---
 README.adoc                  |  1 +
 userland/arch/x86_64/bswap.S | 13 +++++++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 userland/arch/x86_64/bswap.S

diff --git a/README.adoc b/README.adoc
index 85e2652..7eaa00b 100644
--- a/README.adoc
+++ b/README.adoc
@@ -12397,6 +12397,7 @@ Bibliography:
 * Integer typecasts
 ** link:userland/arch/x86_64/movzx.S[]: MOVZX
 ** link:userland/arch/x86_64/movsx.S[]: MOVSX
+* link:userland/arch/x86_64/bswap.S[]: BSWAP: convert between little endian and big endian
 
 ==== x86 CQTO and CLTQ instructions
 
diff --git a/userland/arch/x86_64/bswap.S b/userland/arch/x86_64/bswap.S
new file mode 100644
index 0000000..c6e56fa
--- /dev/null
+++ b/userland/arch/x86_64/bswap.S
@@ -0,0 +1,13 @@
+# # bswap
+
+    # Little endian <=> big endian.
+
+#include <lkmc.h>
+
+LKMC_PROLOGUE
+
+    mov $0x12345678, %eax
+    bswapl %eax
+    LKMC_ASSERT_EQ_32(%eax, $0x78563412)
+
+LKMC_EPILOGUE