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