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kernel add
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/* Written 2003 by Andi Kleen, based on a kernel by Evandro Menezes */
#include <linux/linkage.h>
#include <asm/cpufeature.h>
#include <asm/alternative-asm.h>
/*
* Some CPUs run faster using the string copy instructions (sane microcode).
* It is also a lot simpler. Use this when possible. But, don't use streaming
* copy unless the CPU indicates X86_FEATURE_REP_GOOD. Could vary the
* prefetch distance based on SMP/UP.
*/
ALIGN
ENTRY(copy_page)
ALTERNATIVE "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD
movl $4096/8, %ecx
rep movsq
ret
ENDPROC(copy_page)
ENTRY(copy_page_regs)
subq $2*8, %rsp
movq %rbx, (%rsp)
movq %r12, 1*8(%rsp)
movl $(4096/64)-5, %ecx
.p2align 4
.Loop64:
dec %rcx
movq 0x8*0(%rsi), %rax
movq 0x8*1(%rsi), %rbx
movq 0x8*2(%rsi), %rdx
movq 0x8*3(%rsi), %r8
movq 0x8*4(%rsi), %r9
movq 0x8*5(%rsi), %r10
movq 0x8*6(%rsi), %r11
movq 0x8*7(%rsi), %r12
prefetcht0 5*64(%rsi)
movq %rax, 0x8*0(%rdi)
movq %rbx, 0x8*1(%rdi)
movq %rdx, 0x8*2(%rdi)
movq %r8, 0x8*3(%rdi)
movq %r9, 0x8*4(%rdi)
movq %r10, 0x8*5(%rdi)
movq %r11, 0x8*6(%rdi)
movq %r12, 0x8*7(%rdi)
leaq 64 (%rsi), %rsi
leaq 64 (%rdi), %rdi
jnz .Loop64
movl $5, %ecx
.p2align 4
.Loop2:
decl %ecx
movq 0x8*0(%rsi), %rax
movq 0x8*1(%rsi), %rbx
movq 0x8*2(%rsi), %rdx
movq 0x8*3(%rsi), %r8
movq 0x8*4(%rsi), %r9
movq 0x8*5(%rsi), %r10
movq 0x8*6(%rsi), %r11
movq 0x8*7(%rsi), %r12
movq %rax, 0x8*0(%rdi)
movq %rbx, 0x8*1(%rdi)
movq %rdx, 0x8*2(%rdi)
movq %r8, 0x8*3(%rdi)
movq %r9, 0x8*4(%rdi)
movq %r10, 0x8*5(%rdi)
movq %r11, 0x8*6(%rdi)
movq %r12, 0x8*7(%rdi)
leaq 64(%rdi), %rdi
leaq 64(%rsi), %rsi
jnz .Loop2
movq (%rsp), %rbx
movq 1*8(%rsp), %r12
addq $2*8, %rsp
ret
ENDPROC(copy_page_regs)
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