52 lines
907 B
ArmAsm
52 lines
907 B
ArmAsm
#include <linux/linkage.h>
|
|
#include <asm/export.h>
|
|
|
|
/*
|
|
* Most CPUs support enhanced REP MOVSB/STOSB instructions. It is
|
|
* recommended to use this when possible and we do use them by default.
|
|
* If enhanced REP MOVSB/STOSB is not available, try to use fast string.
|
|
* Otherwise, use original.
|
|
*/
|
|
|
|
/*
|
|
* Zero a page.
|
|
* %rdi - page
|
|
*/
|
|
ENTRY(clear_page_rep)
|
|
movl $4096/8,%ecx
|
|
xorl %eax,%eax
|
|
rep stosq
|
|
ret
|
|
ENDPROC(clear_page_rep)
|
|
EXPORT_SYMBOL_GPL(clear_page_rep)
|
|
|
|
ENTRY(clear_page_orig)
|
|
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
|
|
ENDPROC(clear_page_orig)
|
|
EXPORT_SYMBOL_GPL(clear_page_orig)
|
|
|
|
ENTRY(clear_page_erms)
|
|
movl $4096,%ecx
|
|
xorl %eax,%eax
|
|
rep stosb
|
|
ret
|
|
ENDPROC(clear_page_erms)
|
|
EXPORT_SYMBOL_GPL(clear_page_erms)
|