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