arch/unicore32/lib/copy_page.S

   1 /*
   2  * linux/arch/unicore32/lib/copy_page.S
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  *  ASM optimised string functions
  13  */
  14 #include <linux/linkage.h>
  15 #include <asm/assembler.h>
  16 #include <generated/asm-offsets.h>
  17 #include <asm/cache.h>
  18
  19 #define COPY_COUNT (PAGE_SZ/256)
  20
  21                 .text
  22                 .align  5
  23 /*
  24  * UniCore optimised copy_page routine
  25  */
  26 ENTRY(copy_page)
  27                 stm.w   (r17 - r19, lr), [sp-]
  28                 mov     r17, r0
  29                 mov     r18, r1
  30                 mov     r19, #COPY_COUNT
  31 1:
  32         .rept   4
  33                 ldm.w   (r0 - r15), [r18]+
  34                 stm.w   (r0 - r15), [r17]+
  35         .endr
  36                 sub.a   r19, r19, #1
  37                 bne     1b
  38                 ldm.w   (r17 - r19, pc), [sp]+
  39 ENDPROC(copy_page)