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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