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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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00f554fade
Unaligned stores take alignment exceptions on POWER7 running in little-endian. This is a dumb little-endian base memcpy that prevents unaligned stores. Once booted the feature fixup code switches over to the VMX copy loops (which are already endian safe). The question is what we do before that switch over. The base 64bit memcpy takes alignment exceptions on POWER7 so we can't use it as is. Fixing the causes of alignment exception would slow it down, because we'd need to ensure all loads and stores are aligned either through rotate tricks or bytewise loads and stores. Either would be bad for all other 64bit platforms. [ I simplified the loop a bit - Anton ] Signed-off-by: Philippe Bergheaud <felix@linux.vnet.ibm.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
#ifndef _ASM_POWERPC_STRING_H
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#define _ASM_POWERPC_STRING_H
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#ifdef __KERNEL__
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#define __HAVE_ARCH_STRCPY
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#define __HAVE_ARCH_STRNCPY
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#define __HAVE_ARCH_STRLEN
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#define __HAVE_ARCH_STRCMP
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#define __HAVE_ARCH_STRNCMP
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#define __HAVE_ARCH_STRCAT
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#define __HAVE_ARCH_MEMSET
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#define __HAVE_ARCH_MEMCPY
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#define __HAVE_ARCH_MEMMOVE
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#define __HAVE_ARCH_MEMCMP
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#define __HAVE_ARCH_MEMCHR
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extern char * strcpy(char *,const char *);
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extern char * strncpy(char *,const char *, __kernel_size_t);
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extern __kernel_size_t strlen(const char *);
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extern int strcmp(const char *,const char *);
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extern int strncmp(const char *, const char *, __kernel_size_t);
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extern char * strcat(char *, const char *);
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extern void * memset(void *,int,__kernel_size_t);
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extern void * memcpy(void *,const void *,__kernel_size_t);
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extern void * memmove(void *,const void *,__kernel_size_t);
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extern int memcmp(const void *,const void *,__kernel_size_t);
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extern void * memchr(const void *,int,__kernel_size_t);
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_STRING_H */
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