1#ifndef _ASM_IA64_CMPXCHG_H 2#define _ASM_IA64_CMPXCHG_H 3 4/* 5 * Compare/Exchange, forked from asm/intrinsics.h 6 * which was: 7 * 8 * Copyright (C) 2002-2003 Hewlett-Packard Co 9 * David Mosberger-Tang <davidm@hpl.hp.com> 10 */ 11 12#ifndef __ASSEMBLY__ 13 14#include <linux/types.h> 15/* include compiler specific intrinsics */ 16#include <asm/ia64regs.h> 17#ifdef __INTEL_COMPILER 18# include <asm/intel_intrin.h> 19#else 20# include <asm/gcc_intrin.h> 21#endif 22 23/* 24 * This function doesn't exist, so you'll get a linker error if 25 * something tries to do an invalid xchg(). 26 */ 27extern void ia64_xchg_called_with_bad_pointer(void); 28 29#define __xchg(x, ptr, size) \ 30({ \ 31 unsigned long __xchg_result; \ 32 \ 33 switch (size) { \ 34 case 1: \ 35 __xchg_result = ia64_xchg1((__u8 *)ptr, x); \ 36 break; \ 37 \ 38 case 2: \ 39 __xchg_result = ia64_xchg2((__u16 *)ptr, x); \ 40 break; \ 41 \ 42 case 4: \ 43 __xchg_result = ia64_xchg4((__u32 *)ptr, x); \ 44 break; \ 45 \ 46 case 8: \ 47 __xchg_result = ia64_xchg8((__u64 *)ptr, x); \ 48 break; \ 49 default: \ 50 ia64_xchg_called_with_bad_pointer(); \ 51 } \ 52 __xchg_result; \ 53}) 54 55#define xchg(ptr, x) \ 56((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr)))) 57 58/* 59 * Atomic compare and exchange. Compare OLD with MEM, if identical, 60 * store NEW in MEM. Return the initial value in MEM. Success is 61 * indicated by comparing RETURN with OLD. 62 */ 63 64#define __HAVE_ARCH_CMPXCHG 1 65 66/* 67 * This function doesn't exist, so you'll get a linker error 68 * if something tries to do an invalid cmpxchg(). 69 */ 70extern long ia64_cmpxchg_called_with_bad_pointer(void); 71 72#define ia64_cmpxchg(sem, ptr, old, new, size) \ 73({ \ 74 __u64 _o_, _r_; \ 75 \ 76 switch (size) { \ 77 case 1: \ 78 _o_ = (__u8) (long) (old); \ 79 break; \ 80 case 2: \ 81 _o_ = (__u16) (long) (old); \ 82 break; \ 83 case 4: \ 84 _o_ = (__u32) (long) (old); \ 85 break; \ 86 case 8: \ 87 _o_ = (__u64) (long) (old); \ 88 break; \ 89 default: \ 90 break; \ 91 } \ 92 switch (size) { \ 93 case 1: \ 94 _r_ = ia64_cmpxchg1_##sem((__u8 *) ptr, new, _o_); \ 95 break; \ 96 \ 97 case 2: \ 98 _r_ = ia64_cmpxchg2_##sem((__u16 *) ptr, new, _o_); \ 99 break; \ 100 \ 101 case 4: \ 102 _r_ = ia64_cmpxchg4_##sem((__u32 *) ptr, new, _o_); \ 103 break; \ 104 \ 105 case 8: \ 106 _r_ = ia64_cmpxchg8_##sem((__u64 *) ptr, new, _o_); \ 107 break; \ 108 \ 109 default: \ 110 _r_ = ia64_cmpxchg_called_with_bad_pointer(); \ 111 break; \ 112 } \ 113 (__typeof__(old)) _r_; \ 114}) 115 116#define cmpxchg_acq(ptr, o, n) \ 117 ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr))) 118#define cmpxchg_rel(ptr, o, n) \ 119 ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr))) 120 121/* for compatibility with other platforms: */ 122#define cmpxchg(ptr, o, n) cmpxchg_acq((ptr), (o), (n)) 123#define cmpxchg64(ptr, o, n) cmpxchg_acq((ptr), (o), (n)) 124 125#define cmpxchg_local cmpxchg 126#define cmpxchg64_local cmpxchg64 127 128#ifdef CONFIG_IA64_DEBUG_CMPXCHG 129# define CMPXCHG_BUGCHECK_DECL int _cmpxchg_bugcheck_count = 128; 130# define CMPXCHG_BUGCHECK(v) \ 131do { \ 132 if (_cmpxchg_bugcheck_count-- <= 0) { \ 133 void *ip; \ 134 extern int printk(const char *fmt, ...); \ 135 ip = (void *) ia64_getreg(_IA64_REG_IP); \ 136 printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\ 137 break; \ 138 } \ 139} while (0) 140#else /* !CONFIG_IA64_DEBUG_CMPXCHG */ 141# define CMPXCHG_BUGCHECK_DECL 142# define CMPXCHG_BUGCHECK(v) 143#endif /* !CONFIG_IA64_DEBUG_CMPXCHG */ 144 145#endif /* !__ASSEMBLY__ */ 146 147#endif /* _ASM_IA64_CMPXCHG_H */ 148