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 <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>

#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