Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  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 

#include 

#include 

#define COPY_COUNT (PAGE_SZ/64 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, #32]               )

                mov     r2, #COPY_COUNT                 @       1

                ldmia   r1!, {r3, r4, ip, lr}           @       4+1

1:      PLD(    pld     [r1, #64]               )

        PLD(    pld     [r1, #96]               )

2:              stmia   r0!, {r3, r4, ip, lr}           @       4

                ldmia   r1!, {r3, r4, ip, lr}           @       4+1

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

                ldmia   r1!, {r3, r4, ip, lr}           @       4+1

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

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

                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