arch/unicore32/lib/copy_page.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * linux/arch/unicore32/lib/copy_page.S
   4  *
   5  * Code specific to PKUnity SoC and UniCore ISA
   6  *
   7  * Copyright (C) 2001-2010 GUAN Xue-tao
   8  *
   9  *  ASM optimised string functions
  10  */
  11 #include <linux/linkage.h>
  12 #include <asm/assembler.h>
  13 #include <generated/asm-offsets.h>
  14 #include <asm/cache.h>
  15
  16 #define COPY_COUNT (PAGE_SZ/256)
  17
  18                 .text
  19                 .align  5
  20 /*
  21  * UniCore optimised copy_page routine
  22  */
  23 ENTRY(copy_page)
  24                 stm.w   (r17 - r19, lr), [sp-]
  25                 mov     r17, r0
  26                 mov     r18, r1
  27                 mov     r19, #COPY_COUNT
  28 1:
  29         .rept   4
  30                 ldm.w   (r0 - r15), [r18]+
  31                 stm.w   (r0 - r15), [r17]+
  32         .endr
  33                 sub.a   r19, r19, #1
  34                 bne     1b
  35                 ldm.w   (r17 - r19, pc), [sp]+
  36 ENDPROC(copy_page)