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- /*
- * Zero a page.
- * rdi page
- */
- .globl clear_page
- .p2align 4
- clear_page:
- xorl %eax,%eax
- movl $4096/64,%ecx
- .p2align 4
- .Lloop:
- decl %ecx
- #define PUT(x) movq %rax,x*8(%rdi)
- movq %rax,(%rdi)
- PUT(1)
- PUT(2)
- PUT(3)
- PUT(4)
- PUT(5)
- PUT(6)
- PUT(7)
- leaq 64(%rdi),%rdi
- jnz .Lloop
- nop
- ret
- clear_page_end:
-
- /* C stepping K8 run faster using the string instructions.
- It is also a lot simpler. Use this when possible */
-
- #include <asm/cpufeature.h>
-
- .section .altinstructions,"a"
- .align 8
- .quad clear_page
- .quad clear_page_c
- .byte X86_FEATURE_K8_C
- .byte clear_page_end-clear_page
- .byte clear_page_c_end-clear_page_c
- .previous
- .section .altinstr_replacement,"ax"
- clear_page_c:
- movl $4096/8,%ecx
- xorl %eax,%eax
- rep
- stosq
- ret
- clear_page_c_end:
- .previous
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