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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * linux/arch/arm/lib/copypage.S
| *
| * Copyright (C) 1995-1999 Russell King
| *
| * 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
| ldmiagt r1!, {r3, r4, ip, lr} @ 4
| bgt 1b @ 1
| PLD( ldmiaeq r1!, {r3, r4, ip, lr} )
| PLD( beq 2b )
| ldmfd sp!, {r4, pc} @ 3
| ENDPROC(copy_page)
|
|
