1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_SH_WORD_AT_A_TIME_H 3 #define __ASM_SH_WORD_AT_A_TIME_H 4 5 #ifdef CONFIG_CPU_BIG_ENDIAN 6 # include <asm-generic/word-at-a-time.h> 7 #else 8 #include <linux/bitops.h> 9 #include <linux/wordpart.h> 10 /* 11 * Little-endian version cribbed from x86. 12 */ 13 struct word_at_a_time { 14 const unsigned long one_bits, high_bits; 15 }; 16 17 #define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) } 18 19 /* Carl Chatfield / Jan Achrenius G+ version for 32-bit */ 20 static inline long count_masked_bytes(long mask) 21 { 22 /* (000000 0000ff 00ffff ffffff) -> ( 1 1 2 3 ) */ 23 long a = (0x0ff0001+mask) >> 23; 24 /* Fix the 1 for 00 case */ 25 return a & mask; 26 } 27 28 /* Return nonzero if it has a zero */ 29 static inline unsigned long has_zero(unsigned long a, unsigned long *bits, const struct word_at_a_time *c) 30 { 31 unsigned long mask = ((a - c->one_bits) & ~a) & c->high_bits; 32 *bits = mask; 33 return mask; 34 } 35 36 static inline unsigned long prep_zero_mask(unsigned long a, unsigned long bits, const struct word_at_a_time *c) 37 { 38 return bits; 39 } 40 41 static inline unsigned long create_zero_mask(unsigned long bits) 42 { 43 bits = (bits - 1) & ~bits; 44 return bits >> 7; 45 } 46 47 /* The mask we created is directly usable as a bytemask */ 48 #define zero_bytemask(mask) (mask) 49 50 static inline unsigned long find_zero(unsigned long mask) 51 { 52 return count_masked_bytes(mask); 53 } 54 #endif 55 56 #endif 57