1 #ifndef _ASMARM_BITOPS_H_ 2 #define _ASMARM_BITOPS_H_ 3 /* 4 * Adapated from 5 * include/linux/bitops.h 6 * arch/arm/lib/bitops.h 7 * 8 * Copyright (C) 2015, Red Hat Inc, Andrew Jones <drjones@redhat.com> 9 * 10 * This work is licensed under the terms of the GNU LGPL, version 2. 11 */ 12 13 #define BITS_PER_LONG 32 14 #define BIT(nr) (1UL << (nr)) 15 #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) 16 #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) 17 18 #define ATOMIC_BITOP(insn, mask, word) \ 19 ({ \ 20 unsigned long tmp1, tmp2; \ 21 asm volatile( \ 22 "1: ldrex %0, [%2]\n" \ 23 insn" %0, %0, %3\n" \ 24 " strex %1, %0, [%2]\n" \ 25 " cmp %1, #0\n" \ 26 " bne 1b\n" \ 27 : "=&r" (tmp1), "=&r" (tmp2) \ 28 : "r" (word), "r" (mask) \ 29 : "cc"); \ 30 }) 31 32 #define ATOMIC_TESTOP(insn, mask, word, old) \ 33 ({ \ 34 unsigned long tmp1, tmp2; \ 35 asm volatile( \ 36 "1: ldrex %0, [%3]\n" \ 37 " and %1, %0, %4\n" \ 38 insn" %0, %0, %4\n" \ 39 " strex %2, %0, [%3]\n" \ 40 " cmp %2, #0\n" \ 41 " bne 1b\n" \ 42 : "=&r" (tmp1), "=&r" (old), "=&r" (tmp2) \ 43 : "r" (word), "r" (mask) \ 44 : "cc"); \ 45 }) 46 47 extern void set_bit(int nr, volatile unsigned long *addr); 48 extern void clear_bit(int nr, volatile unsigned long *addr); 49 extern int test_bit(int nr, const volatile unsigned long *addr); 50 extern int test_and_set_bit(int nr, volatile unsigned long *addr); 51 extern int test_and_clear_bit(int nr, volatile unsigned long *addr); 52 53 #endif /* _ASMARM_BITOPS_H_ */ 54