From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/x86_64/lib/clear_page.S | 50 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 arch/x86_64/lib/clear_page.S (limited to 'arch/x86_64/lib/clear_page.S') diff --git a/arch/x86_64/lib/clear_page.S b/arch/x86_64/lib/clear_page.S new file mode 100644 index 000000000000..30a9da458c15 --- /dev/null +++ b/arch/x86_64/lib/clear_page.S @@ -0,0 +1,50 @@ +/* + * 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 + + .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 -- cgit v1.2.1