The patch titled
Subject: x86: implement memset16, memset32 & memset64
has been added to the -mm tree. Its filename is
x86-implement-memset16-memset32-memset64.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-implement-memset16-memset32-memset64.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-implement-memset16-memset32-memset64.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Subject: x86: implement memset16, memset32 & memset64
These are single instructions on x86. There's no 64-bit instruction for
x86-32, but we don't yet have any user for memset64() on 32-bit
architectures, so don't bother to implement it.
Link: http://lkml.kernel.org/r/20170720184539.31609-4-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxxxx>
Cc: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: Matt Turner <mattst88@xxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Richard Henderson <rth@xxxxxxxxxxx>
Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/string_32.h | 24 +++++++++++++++++++
arch/x86/include/asm/string_64.h | 36 +++++++++++++++++++++++++++++
2 files changed, 60 insertions(+)
diff -puN arch/x86/include/asm/string_32.h~x86-implement-memset16-memset32-memset64 arch/x86/include/asm/string_32.h
--- a/arch/x86/include/asm/string_32.h~x86-implement-memset16-memset32-memset64
+++ a/arch/x86/include/asm/string_32.h
@@ -340,6 +340,30 @@ extern void *memset(void *, int, size_t)
#endif
#endif /* !CONFIG_FORTIFY_SOURCE */
+#define __HAVE_ARCH_MEMSET16
+static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
+{
+ int d0, d1;
+ asm volatile("rep\n\t"
+ "stosw"
+ : "=&c" (d0), "=&D" (d1)
+ : "a" (v), "1" (s), "0" (n)
+ : "memory");
+ return s;
+}
+
+#define __HAVE_ARCH_MEMSET32
+static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
+{
+ int d0, d1;
+ asm volatile("rep\n\t"
+ "stosl"
+ : "=&c" (d0), "=&D" (d1)
+ : "a" (v), "1" (s), "0" (n)
+ : "memory");
+ return s;
+}
+
/*
* find the first occurrence of byte 'c', or 1 past the area if none
*/
diff -puN arch/x86/include/asm/string_64.h~x86-implement-memset16-memset32-memset64 arch/x86/include/asm/string_64.h
--- a/arch/x86/include/asm/string_64.h~x86-implement-memset16-memset32-memset64
+++ a/arch/x86/include/asm/string_64.h
@@ -58,6 +58,42 @@ extern void *__memcpy(void *to, const vo
void *memset(void *s, int c, size_t n);
void *__memset(void *s, int c, size_t n);
+#define __HAVE_ARCH_MEMSET16
+static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
+{
+ long d0, d1;
+ asm volatile("rep\n\t"
+ "stosw"
+ : "=&c" (d0), "=&D" (d1)
+ : "a" (v), "1" (s), "0" (n)
+ : "memory");
+ return s;
+}
+
+#define __HAVE_ARCH_MEMSET32
+static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
+{
+ long d0, d1;
+ asm volatile("rep\n\t"
+ "stosl"
+ : "=&c" (d0), "=&D" (d1)
+ : "a" (v), "1" (s), "0" (n)
+ : "memory");
+ return s;
+}
+
+#define __HAVE_ARCH_MEMSET64
+static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
+{
+ long d0, d1;
+ asm volatile("rep\n\t"
+ "stosq"
+ : "=&c" (d0), "=&D" (d1)
+ : "a" (v), "1" (s), "0" (n)
+ : "memory");
+ return s;
+}
+
#define __HAVE_ARCH_MEMMOVE
void *memmove(void *dest, const void *src, size_t count);
void *__memmove(void *dest, const void *src, size_t count);
_
Patches currently in -mm which might be from mawilcox@xxxxxxxxxxxxx are
add-multibyte-memset-functions.patch
add-testcases-for-memset16-32-64.patch
x86-implement-memset16-memset32-memset64.patch
arm-implement-memset32-memset64.patch
alpha-add-support-for-memset16.patch
zram-convert-to-using-memset_l.patch
sym53c8xx_2-convert-to-use-memset32.patch
vga-optimise-console-scrolling.patch
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