47 lines
1.3 KiB
ArmAsm
47 lines
1.3 KiB
ArmAsm
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/constants.h>
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#define COPY_COUNT (PAGE_SZ/64 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, #32] )
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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, #64] )
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PLD( pld [r1, #96] )
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2: stmia r0!, {r3, r4, ip, lr} @ 4
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ldmia r1!, {r3, r4, ip, lr} @ 4+1
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stmia r0!, {r3, r4, ip, lr} @ 4
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ldmia r1!, {r3, r4, ip, lr} @ 4+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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subs r2, r2, #1 @ 1
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stmia r0!, {r3, r4, ip, lr} @ 4
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ldmgtia r1!, {r3, r4, ip, lr} @ 4
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bgt 1b @ 1
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PLD( ldmeqia r1!, {r3, r4, ip, lr} )
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PLD( beq 2b )
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LOADREGS(fd, sp!, {r4, pc}) @ 3
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