1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ASM_IA64_CMPXCHG_H
#define _ASM_IA64_CMPXCHG_H
/*
* Compare/Exchange, forked from asm/intrinsics.h
* which was:
*
* Copyright (C) 2002-2003 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
*/
#ifndef __ASSEMBLY__
#include <linux/types.h>
/* include compiler specific intrinsics */
#include <asm/ia64regs.h>
#ifdef __INTEL_COMPILER
# include <asm/intel_intrin.h>
#else
# include <asm/gcc_intrin.h>
#endif
/*
* This function doesn't exist, so you'll get a linker error if
* something tries to do an invalid xchg().
*/
extern void ia64_xchg_called_with_bad_pointer(void);
#define __xchg(x, ptr, size) \
({ \
unsigned long __xchg_result; \
\
switch (size) { \
case 1: \
__xchg_result = ia64_xchg1((__u8 *)ptr, x); \
break; \
\
case 2: \
__xchg_result = ia64_xchg2((__u16 *)ptr, x); \
break; \
\
case 4: \
__xchg_result = ia64_xchg4((__u32 *)ptr, x); \
break; \
\
case 8: \
__xchg_result = ia64_xchg8((__u64 *)ptr, x); \
break; \
default: \
ia64_xchg_called_with_bad_pointer(); \
} \
__xchg_result; \
})
#define xchg(ptr, x) \
((__typeof__(*(ptr))) __xchg((unsigned long) (x), (ptr), sizeof(*(ptr))))
/*
* Atomic compare and exchange. Compare OLD with MEM, if identical,
* store NEW in MEM. Return the initial value in MEM. Success is
* indicated by comparing RETURN with OLD.
*/
/*
* This function doesn't exist, so you'll get a linker error
* if something tries to do an invalid cmpxchg().
*/
extern long ia64_cmpxchg_called_with_bad_pointer(void);
#define ia64_cmpxchg(sem, ptr, old, new, size) \
({ \
__u64 _o_, _r_; \
\
switch (size) { \
case 1: \
_o_ = (__u8) (long) (old); \
break; \
case 2: \
_o_ = (__u16) (long) (old); \
break; \
case 4: \
_o_ = (__u32) (long) (old); \
break; \
case 8: \
_o_ = (__u64) (long) (old); \
break; \
default: \
break; \
} \
switch (size) { \
case 1: \
_r_ = ia64_cmpxchg1_##sem((__u8 *) ptr, new, _o_); \
break; \
\
case 2: \
_r_ = ia64_cmpxchg2_##sem((__u16 *) ptr, new, _o_); \
break; \
\
case 4: \
_r_ = ia64_cmpxchg4_##sem((__u32 *) ptr, new, _o_); \
break; \
\
case 8: \
_r_ = ia64_cmpxchg8_##sem((__u64 *) ptr, new, _o_); \
break; \
\
default: \
_r_ = ia64_cmpxchg_called_with_bad_pointer(); \
break; \
} \
(__typeof__(old)) _r_; \
})
#define cmpxchg_acq(ptr, o, n) \
ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr)))
#define cmpxchg_rel(ptr, o, n) \
ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr)))
/*
* Worse still - early processor implementations actually just ignored
* the acquire/release and did a full fence all the time. Unfortunately
* this meant a lot of badly written code that used .acq when they really
* wanted .rel became legacy out in the wild - so when we made a cpu
* that strictly did the .acq or .rel ... all that code started breaking - so
* we had to back-pedal and keep the "legacy" behavior of a full fence :-(
*/
/* for compatibility with other platforms: */
#define cmpxchg(ptr, o, n) cmpxchg_acq((ptr), (o), (n))
#define cmpxchg64(ptr, o, n) cmpxchg_acq((ptr), (o), (n))
#define cmpxchg_local cmpxchg
#define cmpxchg64_local cmpxchg64
#ifdef CONFIG_IA64_DEBUG_CMPXCHG
# define CMPXCHG_BUGCHECK_DECL int _cmpxchg_bugcheck_count = 128;
# define CMPXCHG_BUGCHECK(v) \
do { \
if (_cmpxchg_bugcheck_count-- <= 0) { \
void *ip; \
extern int printk(const char *fmt, ...); \
ip = (void *) ia64_getreg(_IA64_REG_IP); \
printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\
break; \
} \
} while (0)
#else /* !CONFIG_IA64_DEBUG_CMPXCHG */
# define CMPXCHG_BUGCHECK_DECL
# define CMPXCHG_BUGCHECK(v)
#endif /* !CONFIG_IA64_DEBUG_CMPXCHG */
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_IA64_CMPXCHG_H */
|
