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| author | Tom Rini <trini@konsulko.com> | 2023-10-02 10:55:44 -0400 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2023-10-02 10:55:44 -0400 |
| commit | ac897385bbfa30cfdfb62ccf24acfcd4b274b2ff (patch) | |
| tree | ae567980737beb24ca24e2ee8cfeaf6eb9e26e3f /arch/arm/lib/bitops.S | |
| parent | 4459ed60cb1e0562bc5b40405e2b4b9bbf766d57 (diff) | |
| parent | e29b932aa07fa0226d325b35d96cd4eea0370129 (diff) | |
Merge branch 'next'
Signed-off-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch/arm/lib/bitops.S')
| -rw-r--r-- | arch/arm/lib/bitops.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/lib/bitops.S b/arch/arm/lib/bitops.S new file mode 100644 index 00000000000..29d15246346 --- /dev/null +++ b/arch/arm/lib/bitops.S @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2023 Sean Anderson <sean.anderson@seco.com> + * + * ARM bitops to call when using THUMB1, which doesn't have these instructions. + */ +#include <linux/linkage.h> +#include <asm/assembler.h> + +.pushsection .text.__fls +ENTRY(__fls) + clz r0, r0 + rsb r0, r0, #31 + ret lr +ENDPROC(__fls) +.popsection + +.pushsection .text.__ffs +ENTRY(__ffs) + rsb r3, r0, #0 + and r0, r0, r3 + clz r0, r0 + rsb r0, r0, #31 + ret lr +ENDPROC(__ffs) +.popsection + +.pushsection .text.fls +ENTRY(fls) + cmp r0, #0 + clzne r0, r0 + rsbne r0, r0, #32 + ret lr +ENDPROC(fls) +.popsection + +.pushsection .text.ffs +ENTRY(ffs) + rsb r3, r0, #0 + and r0, r0, r3 + clz r0, r0 + rsb r0, r0, #32 + ret lr +ENDPROC(ffs) +.popsection |