59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_WORD_AT_A_TIME_H
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#define _ASM_WORD_AT_A_TIME_H
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#include <asm/compiler.h>
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/*
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* word-at-a-time interface for Alpha.
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*/
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/*
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* We do not use the word_at_a_time struct on Alpha, but it needs to be
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* implemented to humour the generic code.
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*/
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struct word_at_a_time {
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const unsigned long unused;
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};
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#define WORD_AT_A_TIME_CONSTANTS { 0 }
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/* Return nonzero if val has a zero */
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static inline unsigned long has_zero(unsigned long val, unsigned long *bits, const struct word_at_a_time *c)
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{
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unsigned long zero_locations = __kernel_cmpbge(0, val);
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*bits = zero_locations;
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return zero_locations;
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}
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static inline unsigned long prep_zero_mask(unsigned long val, unsigned long bits, const struct word_at_a_time *c)
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{
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return bits;
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}
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#define create_zero_mask(bits) (bits)
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static inline unsigned long find_zero(unsigned long bits)
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{
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#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
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/* Simple if have CIX instructions */
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return __kernel_cttz(bits);
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#else
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unsigned long t1, t2, t3;
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/* Retain lowest set bit only */
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bits &= -bits;
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/* Binary search for lowest set bit */
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t1 = bits & 0xf0;
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t2 = bits & 0xcc;
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t3 = bits & 0xaa;
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if (t1) t1 = 4;
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if (t2) t2 = 2;
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if (t3) t3 = 1;
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return t1 + t2 + t3;
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#endif
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}
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#define zero_bytemask(mask) ((2ul << (find_zero(mask) * 8)) - 1)
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#endif /* _ASM_WORD_AT_A_TIME_H */
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