linux-kernel - [PATCH 3/5] x86/boot: Move optmized memcpy() 32/64 bit versions to compressed/string.c

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Message-Id: <1395170800-11059-4-git-send-email-vgoyal@redhat.com>
Date:	Tue, 18 Mar 2014 15:26:38 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	linux-kernel@...r.kernel.org, hpa@...or.com
Cc:	Vivek Goyal <vgoyal@...hat.com>
Subject: [PATCH 3/5] x86/boot: Move optmized memcpy() 32/64 bit versions to compressed/string.c

Move optimzied versions of memcpy to compressed/string.c This will allow
any other code to use these functions too if need be in future. Again
trying to put definition in a common place instead of hiding it in misc.c

Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
---
 arch/x86/boot/compressed/misc.c   | 31 +------------------------------
 arch/x86/boot/compressed/string.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 30 deletions(-)

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 196eaf3..3100092 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -10,6 +10,7 @@
  */
 
 #include "misc.h"
+#include "../string.h"
 
 /* WARNING!!
  * This code is compiled with -fPIC and it is relocated dynamically
@@ -110,7 +111,6 @@ static void error(char *m);
 struct boot_params *real_mode;		/* Pointer to real-mode data */
 
 void *memset(void *s, int c, size_t n);
-void *memcpy(void *dest, const void *src, size_t n);
 
 memptr free_mem_ptr;
 memptr free_mem_end_ptr;
@@ -225,35 +225,6 @@ void *memset(void *s, int c, size_t n)
 		ss[i] = c;
 	return s;
 }
-#ifdef CONFIG_X86_32
-void *memcpy(void *dest, const void *src, size_t n)
-{
-	int d0, d1, d2;
-	asm volatile(
-		"rep ; movsl\n\t"
-		"movl %4,%%ecx\n\t"
-		"rep ; movsb\n\t"
-		: "=&c" (d0), "=&D" (d1), "=&S" (d2)
-		: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
-		: "memory");
-
-	return dest;
-}
-#else
-void *memcpy(void *dest, const void *src, size_t n)
-{
-	long d0, d1, d2;
-	asm volatile(
-		"rep ; movsq\n\t"
-		"movq %4,%%rcx\n\t"
-		"rep ; movsb\n\t"
-		: "=&c" (d0), "=&D" (d1), "=&S" (d2)
-		: "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src)
-		: "memory");
-
-	return dest;
-}
-#endif
 
 static void error(char *x)
 {
diff --git a/arch/x86/boot/compressed/string.c b/arch/x86/boot/compressed/string.c
index 212004e..3b5a82f 100644
--- a/arch/x86/boot/compressed/string.c
+++ b/arch/x86/boot/compressed/string.c
@@ -11,3 +11,36 @@ int memcmp(const void *s1, const void *s2, size_t len)
 }
 
 #include "../string.c"
+
+/* misc.h might pull in string_32.h which has a macro for memcpy. undef that */
+#undef memcpy
+
+#ifdef CONFIG_X86_32
+void *memcpy(void *dest, const void *src, size_t n)
+{
+	int d0, d1, d2;
+	asm volatile(
+		"rep ; movsl\n\t"
+		"movl %4,%%ecx\n\t"
+		"rep ; movsb\n\t"
+		: "=&c" (d0), "=&D" (d1), "=&S" (d2)
+		: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
+		: "memory");
+
+	return dest;
+}
+#else
+void *memcpy(void *dest, const void *src, size_t n)
+{
+	long d0, d1, d2;
+	asm volatile(
+		"rep ; movsq\n\t"
+		"movq %4,%%rcx\n\t"
+		"rep ; movsb\n\t"
+		: "=&c" (d0), "=&D" (d1), "=&S" (d2)
+		: "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src)
+		: "memory");
+
+	return dest;
+}
+#endif
-- 
1.8.5.3

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