80 lines
1.7 KiB
ArmAsm
80 lines
1.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#include <linux/linkage.h>
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#include <linux/const.h>
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#include <asm/assembler.h>
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#include <asm/page.h>
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#include <asm/cpufeature.h>
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#include <asm/alternative.h>
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/*
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* Copy a page from src to dest (both are page aligned)
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*
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* Parameters:
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* x0 - dest
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* x1 - src
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*/
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SYM_FUNC_START(copy_page)
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alternative_if ARM64_HAS_NO_HW_PREFETCH
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// Prefetch three cache lines ahead.
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prfm pldl1strm, [x1, #128]
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prfm pldl1strm, [x1, #256]
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prfm pldl1strm, [x1, #384]
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alternative_else_nop_endif
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ldp x2, x3, [x1]
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ldp x4, x5, [x1, #16]
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ldp x6, x7, [x1, #32]
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ldp x8, x9, [x1, #48]
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ldp x10, x11, [x1, #64]
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ldp x12, x13, [x1, #80]
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ldp x14, x15, [x1, #96]
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ldp x16, x17, [x1, #112]
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add x0, x0, #256
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add x1, x1, #128
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1:
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tst x0, #(PAGE_SIZE - 1)
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alternative_if ARM64_HAS_NO_HW_PREFETCH
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prfm pldl1strm, [x1, #384]
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alternative_else_nop_endif
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stnp x2, x3, [x0, #-256]
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ldp x2, x3, [x1]
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stnp x4, x5, [x0, #16 - 256]
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ldp x4, x5, [x1, #16]
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stnp x6, x7, [x0, #32 - 256]
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ldp x6, x7, [x1, #32]
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stnp x8, x9, [x0, #48 - 256]
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ldp x8, x9, [x1, #48]
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stnp x10, x11, [x0, #64 - 256]
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ldp x10, x11, [x1, #64]
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stnp x12, x13, [x0, #80 - 256]
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ldp x12, x13, [x1, #80]
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stnp x14, x15, [x0, #96 - 256]
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ldp x14, x15, [x1, #96]
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stnp x16, x17, [x0, #112 - 256]
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ldp x16, x17, [x1, #112]
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add x0, x0, #128
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add x1, x1, #128
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b.ne 1b
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stnp x2, x3, [x0, #-256]
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stnp x4, x5, [x0, #16 - 256]
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stnp x6, x7, [x0, #32 - 256]
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stnp x8, x9, [x0, #48 - 256]
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stnp x10, x11, [x0, #64 - 256]
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stnp x12, x13, [x0, #80 - 256]
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stnp x14, x15, [x0, #96 - 256]
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stnp x16, x17, [x0, #112 - 256]
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ret
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SYM_FUNC_END(copy_page)
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EXPORT_SYMBOL(copy_page)
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