threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
54 lines
969 B
ArmAsm
54 lines
969 B
ArmAsm
#include <linux/linkage.h>
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#include <asm/cpufeatures.h>
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#include <asm/alternative-asm.h>
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#include <asm/export.h>
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/*
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* Most CPUs support enhanced REP MOVSB/STOSB instructions. It is
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* recommended to use this when possible and we do use them by default.
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* If enhanced REP MOVSB/STOSB is not available, try to use fast string.
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* Otherwise, use original.
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*/
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/*
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* Zero a page.
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* %rdi - page
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*/
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ENTRY(clear_page_rep)
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movl $4096/8,%ecx
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xorl %eax,%eax
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rep stosq
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ret
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ENDPROC(clear_page_rep)
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EXPORT_SYMBOL_GPL(clear_page_rep)
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ENTRY(clear_page_orig)
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xorl %eax,%eax
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movl $4096/64,%ecx
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.p2align 4
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.Lloop:
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decl %ecx
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#define PUT(x) movq %rax,x*8(%rdi)
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movq %rax,(%rdi)
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PUT(1)
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PUT(2)
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PUT(3)
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PUT(4)
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PUT(5)
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PUT(6)
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PUT(7)
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leaq 64(%rdi),%rdi
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jnz .Lloop
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nop
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ret
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ENDPROC(clear_page_orig)
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EXPORT_SYMBOL_GPL(clear_page_orig)
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ENTRY(clear_page_erms)
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movl $4096,%ecx
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xorl %eax,%eax
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rep stosb
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ret
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ENDPROC(clear_page_erms)
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EXPORT_SYMBOL_GPL(clear_page_erms)
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