| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
| Sam Ravnborg | e6ae744 | 2005-09-09 21:08:59 +0200 | [diff] [blame] | 14 | #include <asm/asm-offsets.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 26 | ENTRY(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 |
| 32 | 1: PLD( pld [r1, #64] ) |
| 33 | PLD( pld [r1, #96] ) |
| 34 | 2: 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 ) |
| Russell King | 1b93a71 | 2006-06-25 11:23:45 +0100 | [diff] [blame] | 46 | ldmfd sp!, {r4, pc} @ 3 |
| Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame^] | 47 | ENDPROC(copy_page) |