diff options
author | Matthew Wilcox | 2017-09-08 16:13:56 -0700 |
---|---|---|
committer | Linus Torvalds | 2017-09-08 18:26:48 -0700 |
commit | 4c51248533adcfb01ba704ce5993ecbad5cc4c99 (patch) | |
tree | a9a8fd11d561540ed991a2d410088e53a55963d4 /arch | |
parent | 03270c13c5ffaa6ac76fe70d0b6929313ca73d86 (diff) |
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@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: David Miller <davem@davemloft.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/x86/include/asm/string_32.h | 24 | ||||
-rw-r--r-- | arch/x86/include/asm/string_64.h | 36 |
2 files changed, 60 insertions, 0 deletions
diff --git a/arch/x86/include/asm/string_32.h b/arch/x86/include/asm/string_32.h index e9ee84873de5..e371e7229042 100644 --- a/arch/x86/include/asm/string_32.h +++ b/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 --git a/arch/x86/include/asm/string_64.h b/arch/x86/include/asm/string_64.h index 2a8c822de1fc..f372a70a523f 100644 --- a/arch/x86/include/asm/string_64.h +++ b/arch/x86/include/asm/string_64.h @@ -58,6 +58,42 @@ extern void *__memcpy(void *to, const void *from, size_t len); 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); |