/*
   *  linux/arch/arm/lib/copypage.S
   *
   *  Copyright (C) 1995-1999 Russell King
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   *  ASM optimised string functions
   */
  #include <linux/linkage.h>
  #include <asm/assembler.h>

  #include <asm/asm-offsets.h>

  #include <asm/cache.h>

  #define COPY_COUNT (PAGE_SZ / (2 * L1_CACHE_BYTES) PLD( -1 ))

  
  		.text
  		.align	5
  /*
   * StrongARM optimised copy_page routine
   * now 1.78bytes/cycle, was 1.60 bytes/cycle (50MHz bus -> 89MB/s)
   * Note that we probably achieve closer to the 100MB/s target with
   * the core clock switching.
   */
  ENTRY(copy_page)
  		stmfd	sp!, {r4, lr}			@	2
  	PLD(	pld	[r1, #0]		)

  	PLD(	pld	[r1, #L1_CACHE_BYTES]		)

  		mov	r2, #COPY_COUNT			@	1
  		ldmia	r1!, {r3, r4, ip, lr}		@	4+1

  1:	PLD(	pld	[r1, #2 * L1_CACHE_BYTES])
  	PLD(	pld	[r1, #3 * L1_CACHE_BYTES])
  2:
  	.rept	(2 * L1_CACHE_BYTES / 16 - 1)

  		stmia	r0!, {r3, r4, ip, lr}		@	4
  		ldmia	r1!, {r3, r4, ip, lr}		@	4

  	.endr

  		subs	r2, r2, #1			@	1
  		stmia	r0!, {r3, r4, ip, lr}		@	4
  		ldmgtia	r1!, {r3, r4, ip, lr}		@	4
  		bgt	1b				@	1
  	PLD(	ldmeqia r1!, {r3, r4, ip, lr}	)
  	PLD(	beq	2b			)

  		ldmfd	sp!, {r4, pc}			@	3

  ENDPROC(copy_page)