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https://github.com/AsahiLinux/u-boot
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46 lines
724 B
ArmAsm
46 lines
724 B
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2023 Sean Anderson <sean.anderson@seco.com>
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*
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* ARM bitops to call when using THUMB1, which doesn't have these instructions.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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.pushsection .text.__fls
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ENTRY(__fls)
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clz r0, r0
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rsb r0, r0, #31
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ret lr
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ENDPROC(__fls)
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.popsection
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.pushsection .text.__ffs
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ENTRY(__ffs)
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rsb r3, r0, #0
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and r0, r0, r3
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clz r0, r0
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rsb r0, r0, #31
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ret lr
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ENDPROC(__ffs)
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.popsection
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.pushsection .text.fls
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ENTRY(fls)
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cmp r0, #0
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clzne r0, r0
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rsbne r0, r0, #32
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ret lr
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ENDPROC(fls)
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.popsection
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.pushsection .text.ffs
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ENTRY(ffs)
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rsb r3, r0, #0
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and r0, r0, r3
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clz r0, r0
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rsb r0, r0, #32
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ret lr
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ENDPROC(ffs)
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.popsection
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