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x86, boot: Move optimized memcpy() 32/64 bit versions to compressed/string.c

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Move optimized 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@redhat.com>
Link: http://lkml.kernel.org/r/1395170800-11059-4-git-send-email-vgoyal@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Vivek Goyal 2014-03-18 15:26:38 -04:00 committed by H. Peter Anvin
parent c041b5ad86
commit 820e8feca0
2 changed files with 34 additions and 30 deletions
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31
arch/x86/boot/compressed/misc.c
View file

@ -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)
{

33
arch/x86/boot/compressed/string.c
View file

@ -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