| /* |
| * 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) |