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- /* Written 2003 by Andi Kleen, based on a kernel by Evandro Menezes */
- #include <linux/linkage.h>
- #include <asm/cpufeatures.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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