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-rw-r--r--include/asm-ia64/spinlock.h220
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diff --git a/include/asm-ia64/spinlock.h b/include/asm-ia64/spinlock.h
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1#ifndef _ASM_IA64_SPINLOCK_H
2#define _ASM_IA64_SPINLOCK_H
3
4/*
5 * Copyright (C) 1998-2003 Hewlett-Packard Co
6 * David Mosberger-Tang <davidm@hpl.hp.com>
7 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
8 *
9 * This file is used for SMP configurations only.
10 */
11
12#include <linux/compiler.h>
13#include <linux/kernel.h>
14#include <linux/bitops.h>
15
16#include <asm/atomic.h>
17#include <asm/intrinsics.h>
18#include <asm/system.h>
19
20#define __raw_spin_lock_init(x) ((x)->lock = 0)
21
22#ifdef ASM_SUPPORTED
23/*
24 * Try to get the lock. If we fail to get the lock, make a non-standard call to
25 * ia64_spinlock_contention(). We do not use a normal call because that would force all
26 * callers of __raw_spin_lock() to be non-leaf routines. Instead, ia64_spinlock_contention() is
27 * carefully coded to touch only those registers that __raw_spin_lock() marks "clobbered".
28 */
29
30#define IA64_SPINLOCK_CLOBBERS "ar.ccv", "ar.pfs", "p14", "p15", "r27", "r28", "r29", "r30", "b6", "memory"
31
32static inline void
33__raw_spin_lock_flags (raw_spinlock_t *lock, unsigned long flags)
34{
35 register volatile unsigned int *ptr asm ("r31") = &lock->lock;
36
37#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
38# ifdef CONFIG_ITANIUM
39 /* don't use brl on Itanium... */
40 asm volatile ("{\n\t"
41 " mov ar.ccv = r0\n\t"
42 " mov r28 = ip\n\t"
43 " mov r30 = 1;;\n\t"
44 "}\n\t"
45 "cmpxchg4.acq r30 = [%1], r30, ar.ccv\n\t"
46 "movl r29 = ia64_spinlock_contention_pre3_4;;\n\t"
47 "cmp4.ne p14, p0 = r30, r0\n\t"
48 "mov b6 = r29;;\n\t"
49 "mov r27=%2\n\t"
50 "(p14) br.cond.spnt.many b6"
51 : "=r"(ptr) : "r"(ptr), "r" (flags) : IA64_SPINLOCK_CLOBBERS);
52# else
53 asm volatile ("{\n\t"
54 " mov ar.ccv = r0\n\t"
55 " mov r28 = ip\n\t"
56 " mov r30 = 1;;\n\t"
57 "}\n\t"
58 "cmpxchg4.acq r30 = [%1], r30, ar.ccv;;\n\t"
59 "cmp4.ne p14, p0 = r30, r0\n\t"
60 "mov r27=%2\n\t"
61 "(p14) brl.cond.spnt.many ia64_spinlock_contention_pre3_4;;"
62 : "=r"(ptr) : "r"(ptr), "r" (flags) : IA64_SPINLOCK_CLOBBERS);
63# endif /* CONFIG_MCKINLEY */
64#else
65# ifdef CONFIG_ITANIUM
66 /* don't use brl on Itanium... */
67 /* mis-declare, so we get the entry-point, not it's function descriptor: */
68 asm volatile ("mov r30 = 1\n\t"
69 "mov r27=%2\n\t"
70 "mov ar.ccv = r0;;\n\t"
71 "cmpxchg4.acq r30 = [%0], r30, ar.ccv\n\t"
72 "movl r29 = ia64_spinlock_contention;;\n\t"
73 "cmp4.ne p14, p0 = r30, r0\n\t"
74 "mov b6 = r29;;\n\t"
75 "(p14) br.call.spnt.many b6 = b6"
76 : "=r"(ptr) : "r"(ptr), "r" (flags) : IA64_SPINLOCK_CLOBBERS);
77# else
78 asm volatile ("mov r30 = 1\n\t"
79 "mov r27=%2\n\t"
80 "mov ar.ccv = r0;;\n\t"
81 "cmpxchg4.acq r30 = [%0], r30, ar.ccv;;\n\t"
82 "cmp4.ne p14, p0 = r30, r0\n\t"
83 "(p14) brl.call.spnt.many b6=ia64_spinlock_contention;;"
84 : "=r"(ptr) : "r"(ptr), "r" (flags) : IA64_SPINLOCK_CLOBBERS);
85# endif /* CONFIG_MCKINLEY */
86#endif
87}
88
89#define __raw_spin_lock(lock) __raw_spin_lock_flags(lock, 0)
90
91/* Unlock by doing an ordered store and releasing the cacheline with nta */
92static inline void __raw_spin_unlock(raw_spinlock_t *x) {
93 barrier();
94 asm volatile ("st4.rel.nta [%0] = r0\n\t" :: "r"(x));
95}
96
97#else /* !ASM_SUPPORTED */
98#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
99# define __raw_spin_lock(x) \
100do { \
101 __u32 *ia64_spinlock_ptr = (__u32 *) (x); \
102 __u64 ia64_spinlock_val; \
103 ia64_spinlock_val = ia64_cmpxchg4_acq(ia64_spinlock_ptr, 1, 0); \
104 if (unlikely(ia64_spinlock_val)) { \
105 do { \
106 while (*ia64_spinlock_ptr) \
107 ia64_barrier(); \
108 ia64_spinlock_val = ia64_cmpxchg4_acq(ia64_spinlock_ptr, 1, 0); \
109 } while (ia64_spinlock_val); \
110 } \
111} while (0)
112#define __raw_spin_unlock(x) do { barrier(); ((raw_spinlock_t *) x)->lock = 0; } while (0)
113#endif /* !ASM_SUPPORTED */
114
115#define __raw_spin_is_locked(x) ((x)->lock != 0)
116#define __raw_spin_trylock(x) (cmpxchg_acq(&(x)->lock, 0, 1) == 0)
117#define __raw_spin_unlock_wait(lock) \
118 do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
119
120#define __raw_read_can_lock(rw) (*(volatile int *)(rw) >= 0)
121#define __raw_write_can_lock(rw) (*(volatile int *)(rw) == 0)
122
123#define __raw_read_lock(rw) \
124do { \
125 raw_rwlock_t *__read_lock_ptr = (rw); \
126 \
127 while (unlikely(ia64_fetchadd(1, (int *) __read_lock_ptr, acq) < 0)) { \
128 ia64_fetchadd(-1, (int *) __read_lock_ptr, rel); \
129 while (*(volatile int *)__read_lock_ptr < 0) \
130 cpu_relax(); \
131 } \
132} while (0)
133
134#define __raw_read_unlock(rw) \
135do { \
136 raw_rwlock_t *__read_lock_ptr = (rw); \
137 ia64_fetchadd(-1, (int *) __read_lock_ptr, rel); \
138} while (0)
139
140#ifdef ASM_SUPPORTED
141#define __raw_write_lock(rw) \
142do { \
143 __asm__ __volatile__ ( \
144 "mov ar.ccv = r0\n" \
145 "dep r29 = -1, r0, 31, 1;;\n" \
146 "1:\n" \
147 "ld4 r2 = [%0];;\n" \
148 "cmp4.eq p0,p7 = r0,r2\n" \
149 "(p7) br.cond.spnt.few 1b \n" \
150 "cmpxchg4.acq r2 = [%0], r29, ar.ccv;;\n" \
151 "cmp4.eq p0,p7 = r0, r2\n" \
152 "(p7) br.cond.spnt.few 1b;;\n" \
153 :: "r"(rw) : "ar.ccv", "p7", "r2", "r29", "memory"); \
154} while(0)
155
156#define __raw_write_trylock(rw) \
157({ \
158 register long result; \
159 \
160 __asm__ __volatile__ ( \
161 "mov ar.ccv = r0\n" \
162 "dep r29 = -1, r0, 31, 1;;\n" \
163 "cmpxchg4.acq %0 = [%1], r29, ar.ccv\n" \
164 : "=r"(result) : "r"(rw) : "ar.ccv", "r29", "memory"); \
165 (result == 0); \
166})
167
168static inline void __raw_write_unlock(raw_rwlock_t *x)
169{
170 u8 *y = (u8 *)x;
171 barrier();
172 asm volatile ("st1.rel.nta [%0] = r0\n\t" :: "r"(y+3) : "memory" );
173}
174
175#else /* !ASM_SUPPORTED */
176
177#define __raw_write_lock(l) \
178({ \
179 __u64 ia64_val, ia64_set_val = ia64_dep_mi(-1, 0, 31, 1); \
180 __u32 *ia64_write_lock_ptr = (__u32 *) (l); \
181 do { \
182 while (*ia64_write_lock_ptr) \
183 ia64_barrier(); \
184 ia64_val = ia64_cmpxchg4_acq(ia64_write_lock_ptr, ia64_set_val, 0); \
185 } while (ia64_val); \
186})
187
188#define __raw_write_trylock(rw) \
189({ \
190 __u64 ia64_val; \
191 __u64 ia64_set_val = ia64_dep_mi(-1, 0, 31,1); \
192 ia64_val = ia64_cmpxchg4_acq((__u32 *)(rw), ia64_set_val, 0); \
193 (ia64_val == 0); \
194})
195
196static inline void __raw_write_unlock(raw_rwlock_t *x)
197{
198 barrier();
199 x->write_lock = 0;
200}
201
202#endif /* !ASM_SUPPORTED */
203
204static inline int __raw_read_trylock(raw_rwlock_t *x)
205{
206 union {
207 raw_rwlock_t lock;
208 __u32 word;
209 } old, new;
210 old.lock = new.lock = *x;
211 old.lock.write_lock = new.lock.write_lock = 0;
212 ++new.lock.read_counter;
213 return (u32)ia64_cmpxchg4_acq((__u32 *)(x), new.word, old.word) == old.word;
214}
215
216#define _raw_spin_relax(lock) cpu_relax()
217#define _raw_read_relax(lock) cpu_relax()
218#define _raw_write_relax(lock) cpu_relax()
219
220#endif /* _ASM_IA64_SPINLOCK_H */
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