1 /*
2 * Copyright 2009-2015 Samy Al Bahra.
3 * Copyright 2012 João Fernandes.
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_PPC_H
29 #define CK_PR_PPC_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
49 /*
50 * This bounces the hardware thread from low to medium
51 * priority. I am unsure of the benefits of this approach
52 * but it is used by the Linux kernel.
53 */
54 CK_CC_INLINE static void
ck_pr_stall(void)55 ck_pr_stall(void)
56 {
57
58 __asm__ __volatile__("or 1, 1, 1;"
59 "or 2, 2, 2;" ::: "memory");
60 return;
61 }
62
63 #define CK_PR_FENCE(T, I) \
64 CK_CC_INLINE static void \
65 ck_pr_fence_strict_##T(void) \
66 { \
67 __asm__ __volatile__(I ::: "memory"); \
68 }
69
70 #ifdef CK_MD_PPC32_LWSYNC
71 #define CK_PR_LWSYNCOP "lwsync"
72 #else /* CK_MD_PPC32_LWSYNC_DISABLE */
73 #define CK_PR_LWSYNCOP "sync"
74 #endif
75
CK_PR_FENCE(atomic,CK_PR_LWSYNCOP)76 CK_PR_FENCE(atomic, CK_PR_LWSYNCOP)
77 CK_PR_FENCE(atomic_store, CK_PR_LWSYNCOP)
78 CK_PR_FENCE(atomic_load, "sync")
79 CK_PR_FENCE(store_atomic, CK_PR_LWSYNCOP)
80 CK_PR_FENCE(load_atomic, CK_PR_LWSYNCOP)
81 CK_PR_FENCE(store, CK_PR_LWSYNCOP)
82 CK_PR_FENCE(store_load, "sync")
83 CK_PR_FENCE(load, CK_PR_LWSYNCOP)
84 CK_PR_FENCE(load_store, CK_PR_LWSYNCOP)
85 CK_PR_FENCE(memory, "sync")
86 CK_PR_FENCE(acquire, CK_PR_LWSYNCOP)
87 CK_PR_FENCE(release, CK_PR_LWSYNCOP)
88 CK_PR_FENCE(acqrel, CK_PR_LWSYNCOP)
89 CK_PR_FENCE(lock, CK_PR_LWSYNCOP)
90 CK_PR_FENCE(unlock, CK_PR_LWSYNCOP)
91
92 #undef CK_PR_LWSYNCOP
93
94 #undef CK_PR_FENCE
95
96 #define CK_PR_LOAD(S, M, T, C, I) \
97 CK_CC_INLINE static T \
98 ck_pr_md_load_##S(const M *target) \
99 { \
100 T r; \
101 __asm__ __volatile__(I "%U1%X1 %0, %1" \
102 : "=r" (r) \
103 : "m" (*(const C *)target) \
104 : "memory"); \
105 return (r); \
106 }
107
108 CK_PR_LOAD(ptr, void, void *, uint32_t, "lwz")
109
110 #define CK_PR_LOAD_S(S, T, I) CK_PR_LOAD(S, T, T, T, I)
111
112 CK_PR_LOAD_S(32, uint32_t, "lwz")
113 CK_PR_LOAD_S(16, uint16_t, "lhz")
114 CK_PR_LOAD_S(8, uint8_t, "lbz")
115 CK_PR_LOAD_S(uint, unsigned int, "lwz")
116 CK_PR_LOAD_S(int, int, "lwz")
117 CK_PR_LOAD_S(short, short, "lhz")
118 CK_PR_LOAD_S(char, char, "lbz")
119
120 #undef CK_PR_LOAD_S
121 #undef CK_PR_LOAD
122
123 #define CK_PR_STORE(S, M, T, C, I) \
124 CK_CC_INLINE static void \
125 ck_pr_md_store_##S(M *target, T v) \
126 { \
127 __asm__ __volatile__(I "%U0%X0 %1, %0" \
128 : "=m" (*(C *)target) \
129 : "r" (v) \
130 : "memory"); \
131 return; \
132 }
133
134 CK_PR_STORE(ptr, void, const void *, uint32_t, "stw")
135
136 #define CK_PR_STORE_S(S, T, I) CK_PR_STORE(S, T, T, T, I)
137
138 CK_PR_STORE_S(32, uint32_t, "stw")
139 CK_PR_STORE_S(16, uint16_t, "sth")
140 CK_PR_STORE_S(8, uint8_t, "stb")
141 CK_PR_STORE_S(uint, unsigned int, "stw")
142 CK_PR_STORE_S(int, int, "stw")
143 CK_PR_STORE_S(short, short, "sth")
144 CK_PR_STORE_S(char, char, "stb")
145
146 #undef CK_PR_STORE_S
147 #undef CK_PR_STORE
148
149 #define CK_PR_CAS(N, T, M) \
150 CK_CC_INLINE static bool \
151 ck_pr_cas_##N##_value(M *target, T compare, T set, M *value) \
152 { \
153 T previous; \
154 __asm__ __volatile__("1:" \
155 "lwarx %0, 0, %1;" \
156 "cmpw 0, %0, %3;" \
157 "bne- 2f;" \
158 "stwcx. %2, 0, %1;" \
159 "bne- 1b;" \
160 "2:" \
161 : "=&r" (previous) \
162 : "r" (target), \
163 "r" (set), \
164 "r" (compare) \
165 : "memory", "cc"); \
166 *(T *)value = previous; \
167 return (previous == compare); \
168 } \
169 CK_CC_INLINE static bool \
170 ck_pr_cas_##N(M *target, T compare, T set) \
171 { \
172 T previous; \
173 __asm__ __volatile__("1:" \
174 "lwarx %0, 0, %1;" \
175 "cmpw 0, %0, %3;" \
176 "bne- 2f;" \
177 "stwcx. %2, 0, %1;" \
178 "bne- 1b;" \
179 "2:" \
180 : "=&r" (previous) \
181 : "r" (target), \
182 "r" (set), \
183 "r" (compare) \
184 : "memory", "cc"); \
185 return (previous == compare); \
186 }
187
188 CK_PR_CAS(ptr, void *, void)
189 #define CK_PR_CAS_S(a, b) CK_PR_CAS(a, b, b)
190 CK_PR_CAS_S(32, uint32_t)
191 CK_PR_CAS_S(uint, unsigned int)
192 CK_PR_CAS_S(int, int)
193
194 #undef CK_PR_CAS_S
195 #undef CK_PR_CAS
196
197 #define CK_PR_FAS(N, M, T, W) \
198 CK_CC_INLINE static T \
199 ck_pr_fas_##N(M *target, T v) \
200 { \
201 T previous; \
202 __asm__ __volatile__("1:" \
203 "l" W "arx %0, 0, %1;" \
204 "st" W "cx. %2, 0, %1;" \
205 "bne- 1b;" \
206 : "=&r" (previous) \
207 : "r" (target), \
208 "r" (v) \
209 : "memory", "cc"); \
210 return (previous); \
211 }
212
213 CK_PR_FAS(32, uint32_t, uint32_t, "w")
214 CK_PR_FAS(ptr, void, void *, "w")
215 CK_PR_FAS(int, int, int, "w")
216 CK_PR_FAS(uint, unsigned int, unsigned int, "w")
217
218 #undef CK_PR_FAS
219
220 #define CK_PR_UNARY(O, N, M, T, I, W) \
221 CK_CC_INLINE static void \
222 ck_pr_##O##_##N(M *target) \
223 { \
224 T previous; \
225 __asm__ __volatile__("1:" \
226 "l" W "arx %0, 0, %1;" \
227 I ";" \
228 "st" W "cx. %0, 0, %1;" \
229 "bne- 1b;" \
230 : "=&r" (previous) \
231 : "r" (target) \
232 : "memory", "cc"); \
233 return; \
234 }
235
236 CK_PR_UNARY(inc, ptr, void, void *, "addic %0, %0, 1", "w")
237 CK_PR_UNARY(dec, ptr, void, void *, "addic %0, %0, -1", "w")
238 CK_PR_UNARY(not, ptr, void, void *, "not %0, %0", "w")
239 CK_PR_UNARY(neg, ptr, void, void *, "neg %0, %0", "w")
240
241 #define CK_PR_UNARY_S(S, T, W) \
242 CK_PR_UNARY(inc, S, T, T, "addic %0, %0, 1", W) \
243 CK_PR_UNARY(dec, S, T, T, "addic %0, %0, -1", W) \
244 CK_PR_UNARY(not, S, T, T, "not %0, %0", W) \
245 CK_PR_UNARY(neg, S, T, T, "neg %0, %0", W)
246
247 CK_PR_UNARY_S(32, uint32_t, "w")
248 CK_PR_UNARY_S(uint, unsigned int, "w")
249 CK_PR_UNARY_S(int, int, "w")
250
251 #undef CK_PR_UNARY_S
252 #undef CK_PR_UNARY
253
254 #define CK_PR_BINARY(O, N, M, T, I, W) \
255 CK_CC_INLINE static void \
256 ck_pr_##O##_##N(M *target, T delta) \
257 { \
258 T previous; \
259 __asm__ __volatile__("1:" \
260 "l" W "arx %0, 0, %1;" \
261 I " %0, %2, %0;" \
262 "st" W "cx. %0, 0, %1;" \
263 "bne- 1b;" \
264 : "=&r" (previous) \
265 : "r" (target), \
266 "r" (delta) \
267 : "memory", "cc"); \
268 return; \
269 }
270
271 CK_PR_BINARY(and, ptr, void, uintptr_t, "and", "w")
272 CK_PR_BINARY(add, ptr, void, uintptr_t, "add", "w")
273 CK_PR_BINARY(or, ptr, void, uintptr_t, "or", "w")
274 CK_PR_BINARY(sub, ptr, void, uintptr_t, "sub", "w")
275 CK_PR_BINARY(xor, ptr, void, uintptr_t, "xor", "w")
276
277 #define CK_PR_BINARY_S(S, T, W) \
278 CK_PR_BINARY(and, S, T, T, "and", W) \
279 CK_PR_BINARY(add, S, T, T, "add", W) \
280 CK_PR_BINARY(or, S, T, T, "or", W) \
281 CK_PR_BINARY(sub, S, T, T, "subf", W) \
282 CK_PR_BINARY(xor, S, T, T, "xor", W)
283
284 CK_PR_BINARY_S(32, uint32_t, "w")
285 CK_PR_BINARY_S(uint, unsigned int, "w")
286 CK_PR_BINARY_S(int, int, "w")
287
288 #undef CK_PR_BINARY_S
289 #undef CK_PR_BINARY
290
291 CK_CC_INLINE static void *
292 ck_pr_faa_ptr(void *target, uintptr_t delta)
293 {
294 uintptr_t previous, r;
295
296 __asm__ __volatile__("1:"
297 "lwarx %0, 0, %2;"
298 "add %1, %3, %0;"
299 "stwcx. %1, 0, %2;"
300 "bne- 1b;"
301 : "=&r" (previous),
302 "=&r" (r)
303 : "r" (target),
304 "r" (delta)
305 : "memory", "cc");
306
307 return (void *)(previous);
308 }
309
310 #define CK_PR_FAA(S, T, W) \
311 CK_CC_INLINE static T \
312 ck_pr_faa_##S(T *target, T delta) \
313 { \
314 T previous, r; \
315 __asm__ __volatile__("1:" \
316 "l" W "arx %0, 0, %2;" \
317 "add %1, %3, %0;" \
318 "st" W "cx. %1, 0, %2;" \
319 "bne- 1b;" \
320 : "=&r" (previous), \
321 "=&r" (r) \
322 : "r" (target), \
323 "r" (delta) \
324 : "memory", "cc"); \
325 return (previous); \
326 }
327
328 CK_PR_FAA(32, uint32_t, "w")
329 CK_PR_FAA(uint, unsigned int, "w")
330 CK_PR_FAA(int, int, "w")
331
332 #undef CK_PR_FAA
333
334 #endif /* CK_PR_PPC_H */
335
336