1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_SH_BITOPS_OP32_H 3 #define __ASM_SH_BITOPS_OP32_H 4 5 #include <linux/bits.h> 6 7 /* 8 * The bit modifying instructions on SH-2A are only capable of working 9 * with a 3-bit immediate, which signifies the shift position for the bit 10 * being worked on. 11 */ 12 #if defined(__BIG_ENDIAN) 13 #define BITOP_LE_SWIZZLE ((BITS_PER_LONG-1) & ~0x7) 14 #define BYTE_NUMBER(nr) ((nr ^ BITOP_LE_SWIZZLE) / BITS_PER_BYTE) 15 #define BYTE_OFFSET(nr) ((nr ^ BITOP_LE_SWIZZLE) % BITS_PER_BYTE) 16 #else 17 #define BYTE_NUMBER(nr) ((nr) / BITS_PER_BYTE) 18 #define BYTE_OFFSET(nr) ((nr) % BITS_PER_BYTE) 19 #endif 20 21 static __always_inline void 22 arch___set_bit(unsigned long nr, volatile unsigned long *addr) 23 { 24 if (__builtin_constant_p(nr)) { 25 __asm__ __volatile__ ( 26 "bset.b %1, @(%O2,%0) ! __set_bit\n\t" 27 : "+r" (addr) 28 : "i" (BYTE_OFFSET(nr)), "i" (BYTE_NUMBER(nr)) 29 : "t", "memory" 30 ); 31 } else { 32 unsigned long mask = BIT_MASK(nr); 33 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); 34 35 *p |= mask; 36 } 37 } 38 39 static __always_inline void 40 arch___clear_bit(unsigned long nr, volatile unsigned long *addr) 41 { 42 if (__builtin_constant_p(nr)) { 43 __asm__ __volatile__ ( 44 "bclr.b %1, @(%O2,%0) ! __clear_bit\n\t" 45 : "+r" (addr) 46 : "i" (BYTE_OFFSET(nr)), 47 "i" (BYTE_NUMBER(nr)) 48 : "t", "memory" 49 ); 50 } else { 51 unsigned long mask = BIT_MASK(nr); 52 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); 53 54 *p &= ~mask; 55 } 56 } 57 58 /** 59 * arch___change_bit - Toggle a bit in memory 60 * @nr: the bit to change 61 * @addr: the address to start counting from 62 * 63 * Unlike change_bit(), this function is non-atomic and may be reordered. 64 * If it's called on the same region of memory simultaneously, the effect 65 * may be that only one operation succeeds. 66 */ 67 static __always_inline void 68 arch___change_bit(unsigned long nr, volatile unsigned long *addr) 69 { 70 if (__builtin_constant_p(nr)) { 71 __asm__ __volatile__ ( 72 "bxor.b %1, @(%O2,%0) ! __change_bit\n\t" 73 : "+r" (addr) 74 : "i" (BYTE_OFFSET(nr)), 75 "i" (BYTE_NUMBER(nr)) 76 : "t", "memory" 77 ); 78 } else { 79 unsigned long mask = BIT_MASK(nr); 80 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); 81 82 *p ^= mask; 83 } 84 } 85 86 /** 87 * arch___test_and_set_bit - Set a bit and return its old value 88 * @nr: Bit to set 89 * @addr: Address to count from 90 * 91 * This operation is non-atomic and can be reordered. 92 * If two examples of this operation race, one can appear to succeed 93 * but actually fail. You must protect multiple accesses with a lock. 94 */ 95 static __always_inline bool 96 arch___test_and_set_bit(unsigned long nr, volatile unsigned long *addr) 97 { 98 unsigned long mask = BIT_MASK(nr); 99 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); 100 unsigned long old = *p; 101 102 *p = old | mask; 103 return (old & mask) != 0; 104 } 105 106 /** 107 * arch___test_and_clear_bit - Clear a bit and return its old value 108 * @nr: Bit to clear 109 * @addr: Address to count from 110 * 111 * This operation is non-atomic and can be reordered. 112 * If two examples of this operation race, one can appear to succeed 113 * but actually fail. You must protect multiple accesses with a lock. 114 */ 115 static __always_inline bool 116 arch___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr) 117 { 118 unsigned long mask = BIT_MASK(nr); 119 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); 120 unsigned long old = *p; 121 122 *p = old & ~mask; 123 return (old & mask) != 0; 124 } 125 126 /* WARNING: non atomic and it can be reordered! */ 127 static __always_inline bool 128 arch___test_and_change_bit(unsigned long nr, volatile unsigned long *addr) 129 { 130 unsigned long mask = BIT_MASK(nr); 131 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); 132 unsigned long old = *p; 133 134 *p = old ^ mask; 135 return (old & mask) != 0; 136 } 137 138 #define arch_test_bit generic_test_bit 139 #define arch_test_bit_acquire generic_test_bit_acquire 140 141 #include <asm-generic/bitops/non-instrumented-non-atomic.h> 142 143 #endif /* __ASM_SH_BITOPS_OP32_H */ 144