projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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> | |
| e6ae744d | 14 | #include <asm/asm-offsets.h> |
| dca230f0 | 15 | #include <asm/cache.h> |
| 1da177e4 | 16 | |
| dca230f0 | 17 | #define COPY_COUNT (PAGE_SZ / (2 * L1_CACHE_BYTES) PLD( -1 )) |
| 1da177e4 LT |
18 | |
| 19 | .text | |
| 20 | .align 5 | |
| 21 | /* | |
| 22 | * StrongARM optimised copy_page routine | |
| 23 | * now 1.78bytes/cycle, was 1.60 bytes/cycle (50MHz bus -> 89MB/s) | |
| 24 | * Note that we probably achieve closer to the 100MB/s target with | |
| 25 | * the core clock switching. | |
| 26 | */ | |
| 27 | ENTRY(copy_page) | |
| 28 | stmfd sp!, {r4, lr} @ 2 | |
| 29 | PLD( pld [r1, #0] ) | |
| dca230f0 | 30 | PLD( pld [r1, #L1_CACHE_BYTES] ) |
| 1da177e4 LT |
31 | mov r2, #COPY_COUNT @ 1 |
| 32 | ldmia r1!, {r3, r4, ip, lr} @ 4+1 | |
| dca230f0 KS |
33 | 1: PLD( pld [r1, #2 * L1_CACHE_BYTES]) |
| 34 | PLD( pld [r1, #3 * L1_CACHE_BYTES]) | |
| 35 | 2: | |
| 36 | .rept (2 * L1_CACHE_BYTES / 16 - 1) | |
| 1da177e4 LT |
37 | stmia r0!, {r3, r4, ip, lr} @ 4 |
| 38 | ldmia r1!, {r3, r4, ip, lr} @ 4 | |
| dca230f0 | 39 | .endr |
| 1da177e4 LT |
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 ) | |
| 1b93a717 | 46 | ldmfd sp!, {r4, pc} @ 3 |
| 93ed3970 | 47 | ENDPROC(copy_page) |