Messages in this thread Patch in this message | | | Subject | [PATCH 2 of 3] memcpy32 for x86_64 | Date | Tue, 27 Dec 2005 15:41:56 -0800 | From | Bryan O'Sullivan <> |
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Introduce an x86_64-specific memcpy32 routine. The routine is similar to memcpy, but is guaranteed to work in units of 32 bits at a time.
Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
diff -r 7b7b442a4d63 -r 042b7d9004ac arch/x86_64/kernel/x8664_ksyms.c --- a/arch/x86_64/kernel/x8664_ksyms.c Tue Dec 27 15:41:48 2005 -0800 +++ b/arch/x86_64/kernel/x8664_ksyms.c Tue Dec 27 15:41:48 2005 -0800 @@ -150,6 +150,8 @@ extern void * memcpy(void *,const void *,__kernel_size_t); extern void * __memcpy(void *,const void *,__kernel_size_t); +extern void memcpy32(void *,const void *,__kernel_size_t); + EXPORT_SYMBOL(memset); EXPORT_SYMBOL(strlen); EXPORT_SYMBOL(memmove); @@ -164,6 +166,8 @@ EXPORT_SYMBOL(memcpy); EXPORT_SYMBOL(__memcpy); +EXPORT_SYMBOL_GPL(memcpy32); + #ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM /* prototypes are wrong, these are assembly with custom calling functions */ extern void rwsem_down_read_failed_thunk(void); diff -r 7b7b442a4d63 -r 042b7d9004ac arch/x86_64/lib/Makefile --- a/arch/x86_64/lib/Makefile Tue Dec 27 15:41:48 2005 -0800 +++ b/arch/x86_64/lib/Makefile Tue Dec 27 15:41:48 2005 -0800 @@ -9,4 +9,4 @@ lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \ usercopy.o getuser.o putuser.o \ thunk.o clear_page.o copy_page.o bitstr.o bitops.o -lib-y += memcpy.o memmove.o memset.o copy_user.o +lib-y += memcpy.o memcpy32.o memmove.o memset.o copy_user.o diff -r 7b7b442a4d63 -r 042b7d9004ac include/asm-x86_64/string.h --- a/include/asm-x86_64/string.h Tue Dec 27 15:41:48 2005 -0800 +++ b/include/asm-x86_64/string.h Tue Dec 27 15:41:48 2005 -0800 @@ -45,6 +45,8 @@ #define __HAVE_ARCH_MEMMOVE void * memmove(void * dest,const void *src,size_t count); +void memcpy32(void *dst, const void *src, size_t count); + /* Use C out of line version for memcmp */ #define memcmp __builtin_memcmp int memcmp(const void * cs,const void * ct,size_t count); diff -r 7b7b442a4d63 -r 042b7d9004ac arch/x86_64/lib/memcpy32.S --- /dev/null Thu Jan 1 00:00:00 1970 +0000 +++ b/arch/x86_64/lib/memcpy32.S Tue Dec 27 15:41:48 2005 -0800 @@ -0,0 +1,25 @@ +/* + * Copyright (c) 2003, 2004, 2005 PathScale, Inc. + */ + +/* + * memcpy32 - Copy a memory block, 32 bits at a time. + * + * Count is number of dwords; it need not be a qword multiple. + * Input: + * rdi destination + * rsi source + * rdx count + */ + + .globl memcpy32 +memcpy32: + movl %edx,%ecx + shrl $1,%ecx + andl $1,%edx + rep + movsq + movl %edx,%ecx + rep + movsd + ret - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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