linux-sg2042/arch/x86_64/lib/copy_page.S

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/* Written 2003 by Andi Kleen, based on a kernel by Evandro Menezes */
/* Don't use streaming store because it's better when the target
ends up in cache. */
/* Could vary the prefetch distance based on SMP/UP */
.globl copy_page
.p2align 4
copy_page:
movl $4096/8,%ecx
rep
movsq
ret