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0f61f6be1f
Now that we have SYM_FUNC_ALIAS() and SYM_FUNC_ALIAS_WEAK(), use those
to simplify and more consistently define function aliases across
arch/arm64.
Aliases are now defined in terms of a canonical function name. For
position-independent functions I've made the __pi_<func> name the
canonical name, and defined other alises in terms of this.
The SYM_FUNC_{START,END}_PI(func) macros obscure the __pi_<func> name,
and make this hard to seatch for. The SYM_FUNC_START_WEAK_PI() macro
also obscures the fact that the __pi_<func> fymbol is global and the
<func> symbol is weak. For clarity, I have removed these macros and used
SYM_FUNC_{START,END}() directly with the __pi_<func> name.
For example:
SYM_FUNC_START_WEAK_PI(func)
... asm insns ...
SYM_FUNC_END_PI(func)
EXPORT_SYMBOL(func)
... becomes:
SYM_FUNC_START(__pi_func)
... asm insns ...
SYM_FUNC_END(__pi_func)
SYM_FUNC_ALIAS_WEAK(func, __pi_func)
EXPORT_SYMBOL(func)
For clarity, where there are multiple annotations such as
EXPORT_SYMBOL(), I've tried to keep annotations grouped by symbol. For
example, where a function has a name and an alias which are both
exported, this is organised as:
SYM_FUNC_START(func)
... asm insns ...
SYM_FUNC_END(func)
EXPORT_SYMBOL(func)
SYM_FUNC_ALIAS(alias, func)
EXPORT_SYMBOL(alias)
For consistency with the other string functions, I've defined strrchr as
a position-independent function, as it can safely be used as such even
though we have no users today.
As we no longer use SYM_FUNC_{START,END}_ALIAS(), our local copies are
removed. The common versions will be removed by a subsequent patch.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Mark Brown <broonie@kernel.org>
Cc: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220216162229.1076788-3-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
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(__pi_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(__pi_copy_page)
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SYM_FUNC_ALIAS(copy_page, __pi_copy_page)
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EXPORT_SYMBOL(copy_page)
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