1 #ifndef _ASMARM64_BITOPS_H_ 2 #define _ASMARM64_BITOPS_H_ 3 /* 4 * Adapted from 5 * arch/arm64/lib/bitops.S 6 * 7 * Copyright (C) 2017, Red Hat Inc, Andrew Jones <drjones@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. 10 */ 11 12 #ifndef _BITOPS_H_ 13 #error only <bitops.h> can be included directly 14 #endif 15 16 #define BITS_PER_LONG 64 17 18 #define HAVE_BUILTIN_FLS 1 19 20 #define ATOMIC_BITOP(insn, mask, word) \ 21 ({ \ 22 unsigned long tmp1, tmp2; \ 23 asm volatile( \ 24 "1: ldxr %0, [%2]\n" \ 25 insn" %0, %0, %3\n" \ 26 " stxr %w1, %0, [%2]\n" \ 27 " cbnz %w1, 1b\n" \ 28 : "=&r" (tmp1), "=&r" (tmp2) \ 29 : "r" (word), "r" (mask) \ 30 : "cc"); \ 31 }) 32 33 #define ATOMIC_TESTOP(insn, mask, word, old) \ 34 ({ \ 35 unsigned long tmp1, tmp2; \ 36 asm volatile( \ 37 "1: ldxr %0, [%3]\n" \ 38 " and %1, %0, %4\n" \ 39 insn" %0, %0, %4\n" \ 40 " stlxr %w2, %0, [%3]\n" \ 41 " cbnz %w2, 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 /* _ASMARM64_BITOPS_H_ */ 54