47 lines
1.3 KiB
ArmAsm
47 lines
1.3 KiB
ArmAsm
|
/*
|
||
|
|
* 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/constants.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 )
|
||
|
|
LOADREGS(fd, sp!, {r4, pc}) @ 3
|