1/*
2 * Copyright 2009-2016 Samy Al Bahra.
3 * Copyright 2013-2016 Olivier Houchard.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef CK_PR_AARCH64_H
29#define CK_PR_AARCH64_H
30
31#ifndef CK_PR_H
32#error Do not include this file directly, use ck_pr.h
33#endif
34
35#include <ck_cc.h>
36#include <ck_md.h>
37
38/*
39 * The following represent supported atomic operations.
40 * These operations may be emulated.
41 */
42#include "ck_f_pr.h"
43
44/*
45 * Minimum interface requirement met.
46 */
47#define CK_F_PR
48
49CK_CC_INLINE static void
50ck_pr_stall(void)
51{
52
53	__asm__ __volatile__("" ::: "memory");
54	return;
55}
56
57#define CK_DMB_SY __asm __volatile("dmb ish" : : "r" (0) : "memory")
58#define CK_DMB_LD __asm __volatile("dmb ishld" : : "r" (0) : "memory")
59#define CK_DMB_ST __asm __volatile("dmb ishst" : : "r" (0) : "memory")
60
61#define CK_PR_FENCE(T, I)				\
62	CK_CC_INLINE static void			\
63	ck_pr_fence_strict_##T(void)			\
64	{						\
65		I;					\
66	}
67
68CK_PR_FENCE(atomic, CK_DMB_ST)
69CK_PR_FENCE(atomic_store, CK_DMB_ST)
70CK_PR_FENCE(atomic_load, CK_DMB_SY)
71CK_PR_FENCE(store_atomic, CK_DMB_ST)
72CK_PR_FENCE(load_atomic, CK_DMB_SY)
73CK_PR_FENCE(store, CK_DMB_ST)
74CK_PR_FENCE(store_load, CK_DMB_SY)
75CK_PR_FENCE(load, CK_DMB_LD)
76CK_PR_FENCE(load_store, CK_DMB_SY)
77CK_PR_FENCE(memory, CK_DMB_SY)
78CK_PR_FENCE(acquire, CK_DMB_SY)
79CK_PR_FENCE(release, CK_DMB_SY)
80CK_PR_FENCE(acqrel, CK_DMB_SY)
81CK_PR_FENCE(lock, CK_DMB_SY)
82CK_PR_FENCE(unlock, CK_DMB_SY)
83
84#undef CK_PR_FENCE
85
86#undef CK_DMB_SI
87#undef CK_DMB_LD
88#undef CK_DMB_ST
89
90#define CK_PR_LOAD(S, M, T, I)				\
91	CK_CC_INLINE static T					\
92	ck_pr_md_load_##S(const M *target)			\
93	{							\
94		long r = 0;					\
95		__asm__ __volatile__(I " %w0, [%1];"		\
96					: "=r" (r)		\
97					: "r"  (target)		\
98					: "memory");		\
99		return ((T)r);					\
100	}
101#define CK_PR_LOAD_64(S, M, T, I)				\
102	CK_CC_INLINE static T					\
103	ck_pr_md_load_##S(const M *target)			\
104	{							\
105		long r = 0;					\
106		__asm__ __volatile__(I " %0, [%1];"		\
107					: "=r" (r)		\
108					: "r"  (target)		\
109					: "memory");		\
110		return ((T)r);					\
111	}
112
113
114CK_PR_LOAD_64(ptr, void, void *, "ldr")
115
116#define CK_PR_LOAD_S(S, T, I) CK_PR_LOAD(S, T, T, I)
117#define CK_PR_LOAD_S_64(S, T, I) CK_PR_LOAD_64(S, T, T, I)
118
119CK_PR_LOAD_S_64(64, uint64_t, "ldr")
120CK_PR_LOAD_S(32, uint32_t, "ldr")
121CK_PR_LOAD_S(16, uint16_t, "ldrh")
122CK_PR_LOAD_S(8, uint8_t, "ldrb")
123CK_PR_LOAD_S(uint, unsigned int, "ldr")
124CK_PR_LOAD_S(int, int, "ldr")
125CK_PR_LOAD_S(short, short, "ldrh")
126CK_PR_LOAD_S(char, char, "ldrb")
127#ifndef CK_PR_DISABLE_DOUBLE
128CK_PR_LOAD_S_64(double, double, "ldr")
129#endif
130
131#undef CK_PR_LOAD_S
132#undef CK_PR_LOAD_S_64
133#undef CK_PR_LOAD
134#undef CK_PR_LAOD_64
135
136#define CK_PR_STORE(S, M, T, I)					\
137	CK_CC_INLINE static void				\
138	ck_pr_md_store_##S(M *target, T v)			\
139	{							\
140		__asm__ __volatile__(I " %w1, [%0]"		\
141					:			\
142					: "r" (target),		\
143					  "r" (v)		\
144					: "memory");		\
145		return;						\
146	}
147#define CK_PR_STORE_64(S, M, T, I)				\
148	CK_CC_INLINE static void				\
149	ck_pr_md_store_##S(M *target, T v)			\
150	{							\
151		__asm__ __volatile__(I " %1, [%0]"		\
152					:			\
153					: "r" (target),		\
154					  "r" (v)		\
155					: "memory");		\
156		return;						\
157	}
158
159CK_PR_STORE_64(ptr, void, const void *, "str")
160
161#define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, I)
162#define CK_PR_STORE_S_64(S, T, I) CK_PR_STORE_64(S, T, T, I)
163
164CK_PR_STORE_S_64(64, uint64_t, "str")
165CK_PR_STORE_S(32, uint32_t, "str")
166CK_PR_STORE_S(16, uint16_t, "strh")
167CK_PR_STORE_S(8, uint8_t, "strb")
168CK_PR_STORE_S(uint, unsigned int, "str")
169CK_PR_STORE_S(int, int, "str")
170CK_PR_STORE_S(short, short, "strh")
171CK_PR_STORE_S(char, char, "strb")
172#ifndef CK_PR_DISABLE_DOUBLE
173CK_PR_STORE_S_64(double, double, "str")
174#endif
175
176#undef CK_PR_STORE_S
177#undef CK_PR_STORE_S_64
178#undef CK_PR_STORE
179#undef CK_PR_STORE_64
180
181#ifdef CK_MD_LSE_ENABLE
182#include "ck_pr_lse.h"
183#else
184#include "ck_pr_llsc.h"
185#endif
186
187/*
188 * ck_pr_neg_*() functions can only be implemented via LL/SC, as there are no
189 * LSE alternatives.
190 */
191#define CK_PR_NEG(N, M, T, W, R)				\
192        CK_CC_INLINE static void				\
193        ck_pr_neg_##N(M *target)				\
194        {							\
195                T previous = 0;					\
196                T tmp = 0;					\
197                __asm__ __volatile__("1:"			\
198                                     "ldxr" W " %" R "0, [%2];"	\
199                                     "neg %" R "0, %" R "0;"	\
200                                     "stxr" W " %w1, %" R "0, [%2];"	\
201                                     "cbnz %w1, 1b;"		\
202                                        : "=&r" (previous),	\
203                                          "=&r" (tmp)		\
204                                        : "r"   (target)	\
205                                        : "memory", "cc");	\
206                return;						\
207        }
208
209CK_PR_NEG(ptr, void, void *, "", "")
210CK_PR_NEG(64, uint64_t, uint64_t, "", "")
211
212#define CK_PR_NEG_S(S, T, W)					\
213        CK_PR_NEG(S, T, T, W, "w")				\
214
215CK_PR_NEG_S(32, uint32_t, "")
216CK_PR_NEG_S(uint, unsigned int, "")
217CK_PR_NEG_S(int, int, "")
218CK_PR_NEG_S(16, uint16_t, "h")
219CK_PR_NEG_S(8, uint8_t, "b")
220CK_PR_NEG_S(short, short, "h")
221CK_PR_NEG_S(char, char, "b")
222
223#undef CK_PR_NEG_S
224#undef CK_PR_NEG
225
226#endif /* CK_PR_AARCH64_H */
227
228