1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* -*- linux-c -*- ------------------------------------------------------- * 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 * Copyright 2007 rPath, Inc. - All Rights Reserved 6 * 7 * ----------------------------------------------------------------------- */ 8 9 /* 10 * Very simple bitops for the boot code. 11 */ 12 13 #ifndef BOOT_BITOPS_H 14 #define BOOT_BITOPS_H 15 #define _LINUX_BITOPS_H /* Inhibit inclusion of <linux/bitops.h> */ 16 17 #include <linux/types.h> 18 #include <asm/asm.h> 19 20 static inline bool constant_test_bit(int nr, const void *addr) 21 { 22 const u32 *p = (const u32 *)addr; 23 return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0; 24 } 25 static inline bool variable_test_bit(int nr, const void *addr) 26 { 27 bool v; 28 const u32 *p = (const u32 *)addr; 29 30 asm("btl %2,%1" CC_SET(c) : CC_OUT(c) (v) : "m" (*p), "Ir" (nr)); 31 return v; 32 } 33 34 #define test_bit(nr,addr) \ 35 (__builtin_constant_p(nr) ? \ 36 constant_test_bit((nr),(addr)) : \ 37 variable_test_bit((nr),(addr))) 38 39 static inline void set_bit(int nr, void *addr) 40 { 41 asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr)); 42 } 43 44 #endif /* BOOT_BITOPS_H */ 45