1/* 2 * linux/arch/arm/lib/copypage.S 3 * 4 * Copyright (C) 1995-1999 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * ASM optimised string functions 11 */ 12#include <linux/linkage.h> 13#include <asm/assembler.h> 14#include <asm/asm-offsets.h> 15 16#define COPY_COUNT (PAGE_SZ/64 PLD( -1 )) 17 18 .text 19 .align 5 20/* 21 * StrongARM optimised copy_page routine 22 * now 1.78bytes/cycle, was 1.60 bytes/cycle (50MHz bus -> 89MB/s) 23 * Note that we probably achieve closer to the 100MB/s target with 24 * the core clock switching. 25 */ 26ENTRY(copy_page) 27 stmfd sp!, {r4, lr} @ 2 28 PLD( pld [r1, #0] ) 29 PLD( pld [r1, #32] ) 30 mov r2, #COPY_COUNT @ 1 31 ldmia r1!, {r3, r4, ip, lr} @ 4+1 321: PLD( pld [r1, #64] ) 33 PLD( pld [r1, #96] ) 342: stmia r0!, {r3, r4, ip, lr} @ 4 35 ldmia r1!, {r3, r4, ip, lr} @ 4+1 36 stmia r0!, {r3, r4, ip, lr} @ 4 37 ldmia r1!, {r3, r4, ip, lr} @ 4+1 38 stmia r0!, {r3, r4, ip, lr} @ 4 39 ldmia r1!, {r3, r4, ip, lr} @ 4 40 subs r2, r2, #1 @ 1 41 stmia r0!, {r3, r4, ip, lr} @ 4 42 ldmgtia r1!, {r3, r4, ip, lr} @ 4 43 bgt 1b @ 1 44 PLD( ldmeqia r1!, {r3, r4, ip, lr} ) 45 PLD( beq 2b ) 46 ldmfd sp!, {r4, pc} @ 3 47