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d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
45 lines
1.1 KiB
ArmAsm
45 lines
1.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm/lib/copypage.S
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*
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* Copyright (C) 1995-1999 Russell King
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*
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* ASM optimised string functions
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/asm-offsets.h>
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#include <asm/cache.h>
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#define COPY_COUNT (PAGE_SZ / (2 * L1_CACHE_BYTES) PLD( -1 ))
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.text
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.align 5
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/*
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* StrongARM optimised copy_page routine
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* now 1.78bytes/cycle, was 1.60 bytes/cycle (50MHz bus -> 89MB/s)
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* Note that we probably achieve closer to the 100MB/s target with
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* the core clock switching.
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*/
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ENTRY(copy_page)
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stmfd sp!, {r4, lr} @ 2
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PLD( pld [r1, #0] )
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PLD( pld [r1, #L1_CACHE_BYTES] )
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mov r2, #COPY_COUNT @ 1
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ldmia r1!, {r3, r4, ip, lr} @ 4+1
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1: PLD( pld [r1, #2 * L1_CACHE_BYTES])
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PLD( pld [r1, #3 * L1_CACHE_BYTES])
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2:
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.rept (2 * L1_CACHE_BYTES / 16 - 1)
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stmia r0!, {r3, r4, ip, lr} @ 4
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ldmia r1!, {r3, r4, ip, lr} @ 4
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.endr
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subs r2, r2, #1 @ 1
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stmia r0!, {r3, r4, ip, lr} @ 4
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ldmiagt r1!, {r3, r4, ip, lr} @ 4
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bgt 1b @ 1
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PLD( ldmiaeq r1!, {r3, r4, ip, lr} )
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PLD( beq 2b )
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ldmfd sp!, {r4, pc} @ 3
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ENDPROC(copy_page)
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