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ce6b5ff5f1
Similarly to what was done to the memcpy() routines, make copy_page() and clear_page() also use the Armv8.8 FEAT_MOPS instructions. Note: For copy_page() this uses the CPY* instructions instead of CPYF* as CPYF* doesn't allow src and dst to be equal. It's not clear if copy_page() needs to allow equal src and dst but it has worked so far with the current implementation and there is no documentation forbidding it. Note, the unoptimized version of copy_page() in assembler.h is left as it is. Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com> Link: https://lore.kernel.org/r/20240930161051.3777828-6-kristina.martsenko@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
54 lines
959 B
ArmAsm
54 lines
959 B
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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/*
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* Clear page @dest
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*
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* Parameters:
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* x0 - dest
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*/
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SYM_FUNC_START(__pi_clear_page)
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#ifdef CONFIG_AS_HAS_MOPS
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.arch_extension mops
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alternative_if_not ARM64_HAS_MOPS
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b .Lno_mops
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alternative_else_nop_endif
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mov x1, #PAGE_SIZE
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setpn [x0]!, x1!, xzr
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setmn [x0]!, x1!, xzr
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seten [x0]!, x1!, xzr
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ret
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.Lno_mops:
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#endif
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mrs x1, dczid_el0
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tbnz x1, #4, 2f /* Branch if DC ZVA is prohibited */
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and w1, w1, #0xf
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mov x2, #4
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lsl x1, x2, x1
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1: dc zva, x0
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add x0, x0, x1
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tst x0, #(PAGE_SIZE - 1)
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b.ne 1b
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ret
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2: stnp xzr, xzr, [x0]
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stnp xzr, xzr, [x0, #16]
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stnp xzr, xzr, [x0, #32]
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stnp xzr, xzr, [x0, #48]
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add x0, x0, #64
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tst x0, #(PAGE_SIZE - 1)
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b.ne 2b
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ret
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SYM_FUNC_END(__pi_clear_page)
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SYM_FUNC_ALIAS(clear_page, __pi_clear_page)
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EXPORT_SYMBOL(clear_page)
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