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1 | /* | |
2 | * Copyright (c) 2007-2017 Apple Inc. All rights reserved. | |
3 | * | |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ | |
5 | * | |
6 | * This file contains Original Code and/or Modifications of Original Code | |
7 | * as defined in and that are subject to the Apple Public Source License | |
8 | * Version 2.0 (the 'License'). You may not use this file except in | |
9 | * compliance with the License. The rights granted to you under the License | |
10 | * may not be used to create, or enable the creation or redistribution of, | |
11 | * unlawful or unlicensed copies of an Apple operating system, or to | |
12 | * circumvent, violate, or enable the circumvention or violation of, any | |
13 | * terms of an Apple operating system software license agreement. | |
14 | * | |
15 | * Please obtain a copy of the License at | |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. | |
17 | * | |
18 | * The Original Code and all software distributed under the License are | |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
23 | * Please see the License for the specific language governing rights and | |
24 | * limitations under the License. | |
25 | * | |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ | |
27 | */ | |
28 | ||
29 | #ifndef _ARM_LOCKS_H_ | |
30 | #define _ARM_LOCKS_H_ | |
31 | ||
32 | #include <kern/kern_types.h> | |
33 | #ifdef MACH_KERNEL_PRIVATE | |
34 | #include <arm/hw_lock_types.h> | |
35 | #endif | |
36 | ||
37 | ||
38 | #ifdef MACH_KERNEL_PRIVATE | |
39 | ||
40 | #define enaLkDeb 0x00000001 /* Request debug in default attribute */ | |
41 | #define enaLkStat 0x00000002 /* Request statistic in default attribute */ | |
42 | #define disLkRWPrio 0x00000004 /* Disable RW lock priority promotion */ | |
43 | #define enaLkTimeStat 0x00000008 /* Request time statistics in default attribute */ | |
44 | ||
45 | #define disLkType 0x80000000 /* Disable type checking */ | |
46 | #define disLktypeb 0 | |
47 | #define disLkThread 0x40000000 /* Disable ownership checking */ | |
48 | #define disLkThreadb 1 | |
49 | #define enaLkExtStck 0x20000000 /* Enable extended backtrace */ | |
50 | #define enaLkExtStckb 2 | |
51 | #define disLkMyLck 0x10000000 /* Disable recursive lock dectection */ | |
52 | #define disLkMyLckb 3 | |
53 | ||
54 | #endif | |
55 | ||
56 | #ifdef MACH_KERNEL_PRIVATE | |
57 | typedef struct { | |
58 | struct hslock hwlock; | |
59 | uintptr_t type; | |
60 | } lck_spin_t; | |
61 | ||
62 | #define lck_spin_data hwlock.lock_data | |
63 | ||
64 | #define LCK_SPIN_TAG_DESTROYED 0xdead /* lock marked as Destroyed */ | |
65 | ||
66 | #define LCK_SPIN_TYPE 0x00000011 | |
67 | ||
68 | #else | |
69 | #ifdef KERNEL_PRIVATE | |
70 | ||
71 | typedef struct { | |
72 | uintptr_t opaque[2]; | |
73 | } lck_spin_t; | |
74 | ||
75 | #else | |
76 | typedef struct __lck_spin_t__ lck_spin_t; | |
77 | #endif // KERNEL_PRIVATE | |
78 | #endif // MACH_KERNEL_PRIVATE | |
79 | ||
80 | #ifdef MACH_KERNEL_PRIVATE | |
81 | typedef struct _lck_mtx_ { | |
82 | union { | |
83 | uintptr_t lck_mtx_data; /* Thread pointer plus lock bits */ | |
84 | uintptr_t lck_mtx_tag; /* Tag for type */ | |
85 | }; /* arm: 4 arm64: 8 */ | |
86 | union { | |
87 | struct { | |
88 | uint16_t lck_mtx_waiters;/* Number of waiters */ | |
89 | uint8_t lck_mtx_pri; /* unused */ | |
90 | uint8_t lck_mtx_type; /* Type */ | |
91 | }; | |
92 | struct { | |
93 | struct _lck_mtx_ext_ *lck_mtx_ptr; /* Indirect pointer */ | |
94 | }; | |
95 | }; /* arm: 4 arm64: 8 */ | |
96 | } lck_mtx_t; /* arm: 8 arm64: 16 */ | |
97 | ||
98 | /* Shared between mutex and read-write locks */ | |
99 | #define LCK_ILOCK_BIT 0 | |
100 | #define ARM_LCK_WAITERS_BIT 1 | |
101 | #define LCK_ILOCK (1 << LCK_ILOCK_BIT) | |
102 | #define ARM_LCK_WAITERS (1 << ARM_LCK_WAITERS_BIT) | |
103 | ||
104 | #define LCK_MTX_TYPE 0x22 /* lock type */ | |
105 | ||
106 | #define LCK_MTX_TAG_INDIRECT 0x00001007 /* lock marked as Indirect */ | |
107 | #define LCK_MTX_TAG_DESTROYED 0x00002007 /* lock marked as Destroyed */ | |
108 | ||
109 | #define LCK_FRAMES_MAX 8 | |
110 | ||
111 | extern uint64_t MutexSpin; | |
112 | extern uint64_t low_MutexSpin; | |
113 | extern int64_t high_MutexSpin; | |
114 | ||
115 | typedef struct { | |
116 | unsigned int type; | |
117 | vm_offset_t stack[LCK_FRAMES_MAX]; | |
118 | vm_offset_t thread; | |
119 | } lck_mtx_deb_t; | |
120 | ||
121 | #define MUTEX_TAG 0x4d4d | |
122 | ||
123 | typedef struct { | |
124 | unsigned int lck_mtx_stat_data; | |
125 | } lck_mtx_stat_t; | |
126 | ||
127 | typedef struct _lck_mtx_ext_ { | |
128 | lck_mtx_t lck_mtx; /* arm: 12 arm64: 24 */ | |
129 | struct _lck_grp_ *lck_mtx_grp; /* arm: 4 arm64: 8 */ | |
130 | unsigned int lck_mtx_attr; /* arm: 4 arm64: 4 */ | |
131 | lck_mtx_stat_t lck_mtx_stat; /* arm: 4 arm64: 4 */ | |
132 | lck_mtx_deb_t lck_mtx_deb; /* arm: 40 arm64: 80 */ | |
133 | } lck_mtx_ext_t; /* arm: 64 arm64: 120 */ | |
134 | ||
135 | #define LCK_MTX_ATTR_DEBUG 0x1 | |
136 | #define LCK_MTX_ATTR_DEBUGb 31 | |
137 | #define LCK_MTX_ATTR_STAT 0x2 | |
138 | #define LCK_MTX_ATTR_STATb 30 | |
139 | ||
140 | #define LCK_MTX_EVENT(lck) ((event_t)(((unsigned int*)(lck))+((sizeof(lck_mtx_t)-1)/sizeof(unsigned int)))) | |
141 | #define LCK_EVENT_TO_MUTEX(event) ((lck_mtx_t *)(uintptr_t)(((unsigned int *)(event)) - ((sizeof(lck_mtx_t)-1)/sizeof(unsigned int)))) | |
142 | ||
143 | #else | |
144 | #ifdef KERNEL_PRIVATE | |
145 | typedef struct { | |
146 | uintptr_t opaque[2]; | |
147 | } lck_mtx_t; | |
148 | ||
149 | typedef struct { | |
150 | #if defined(__arm64__) | |
151 | unsigned long opaque[16]; | |
152 | #else /* __arm__ */ | |
153 | unsigned int opaque[16]; | |
154 | #endif | |
155 | } lck_mtx_ext_t; | |
156 | ||
157 | #else | |
158 | typedef struct __lck_mtx_t__ lck_mtx_t; | |
159 | #endif | |
160 | #endif | |
161 | ||
162 | #ifdef MACH_KERNEL_PRIVATE | |
163 | ||
164 | typedef union { | |
165 | struct { | |
166 | uint16_t shared_count; /* No. of shared granted request */ | |
167 | uint16_t interlock: 1, /* Interlock */ | |
168 | priv_excl: 1, /* priority for Writer */ | |
169 | want_upgrade: 1, /* Read-to-write upgrade waiting */ | |
170 | want_excl: 1, /* Writer is waiting, or locked for write */ | |
171 | r_waiting: 1, /* Someone is sleeping on lock */ | |
172 | w_waiting: 1, /* Writer is sleeping on lock */ | |
173 | can_sleep: 1, /* Can attempts to lock go to sleep? */ | |
174 | _pad2: 8, /* padding */ | |
175 | tag_valid: 1; /* Field is actually a tag, not a bitfield */ | |
176 | #if __arm64__ | |
177 | uint32_t _pad4; | |
178 | #endif | |
179 | }; | |
180 | struct { | |
181 | uint32_t data; /* Single word version of bitfields and shared count */ | |
182 | #if __arm64__ | |
183 | uint32_t lck_rw_pad4; | |
184 | #endif | |
185 | }; | |
186 | } lck_rw_word_t; | |
187 | ||
188 | typedef struct { | |
189 | lck_rw_word_t word; | |
190 | thread_t lck_rw_owner; | |
191 | } lck_rw_t; /* arm: 8 arm64: 16 */ | |
192 | ||
193 | #define lck_rw_shared_count word.shared_count | |
194 | #define lck_rw_interlock word.interlock | |
195 | #define lck_rw_priv_excl word.priv_excl | |
196 | #define lck_rw_want_upgrade word.want_upgrade | |
197 | #define lck_rw_want_excl word.want_excl | |
198 | #define lck_r_waiting word.r_waiting | |
199 | #define lck_w_waiting word.w_waiting | |
200 | #define lck_rw_can_sleep word.can_sleep | |
201 | #define lck_rw_data word.data | |
202 | // tag and data reference the same memory. When the tag_valid bit is set, | |
203 | // the data word should be treated as a tag instead of a bitfield. | |
204 | #define lck_rw_tag_valid word.tag_valid | |
205 | #define lck_rw_tag word.data | |
206 | ||
207 | #define LCK_RW_SHARED_READER_OFFSET 0 | |
208 | #define LCK_RW_INTERLOCK_BIT 16 | |
209 | #define LCK_RW_PRIV_EXCL_BIT 17 | |
210 | #define LCK_RW_WANT_UPGRADE_BIT 18 | |
211 | #define LCK_RW_WANT_EXCL_BIT 19 | |
212 | #define LCK_RW_R_WAITING_BIT 20 | |
213 | #define LCK_RW_W_WAITING_BIT 21 | |
214 | #define LCK_RW_CAN_SLEEP_BIT 22 | |
215 | // 23-30 | |
216 | #define LCK_RW_TAG_VALID_BIT 31 | |
217 | ||
218 | #define LCK_RW_INTERLOCK (1U << LCK_RW_INTERLOCK_BIT) | |
219 | #define LCK_RW_R_WAITING (1U << LCK_RW_R_WAITING_BIT) | |
220 | #define LCK_RW_W_WAITING (1U << LCK_RW_W_WAITING_BIT) | |
221 | #define LCK_RW_WANT_UPGRADE (1U << LCK_RW_WANT_UPGRADE_BIT) | |
222 | #define LCK_RW_WANT_EXCL (1U << LCK_RW_WANT_EXCL_BIT) | |
223 | #define LCK_RW_TAG_VALID (1U << LCK_RW_TAG_VALID_BIT) | |
224 | #define LCK_RW_PRIV_EXCL (1U << LCK_RW_PRIV_EXCL_BIT) | |
225 | #define LCK_RW_SHARED_MASK (0xffff << LCK_RW_SHARED_READER_OFFSET) | |
226 | #define LCK_RW_SHARED_READER (0x1 << LCK_RW_SHARED_READER_OFFSET) | |
227 | ||
228 | #define LCK_RW_TAG_DESTROYED ((LCK_RW_TAG_VALID | 0xdddddeadu)) /* lock marked as Destroyed */ | |
229 | ||
230 | #define LCK_RW_WRITER_EVENT(lck) (event_t)((uintptr_t)(lck)+1) | |
231 | #define LCK_RW_READER_EVENT(lck) (event_t)((uintptr_t)(lck)+2) | |
232 | #define WRITE_EVENT_TO_RWLOCK(event) ((lck_rw_t *)((uintptr_t)(event)-1)) | |
233 | #define READ_EVENT_TO_RWLOCK(event) ((lck_rw_t *)((uintptr_t)(event)-2)) | |
234 | ||
235 | #if __ARM_ENABLE_WFE_ | |
236 | ||
237 | #define wait_for_event() __builtin_arm_wfe() | |
238 | #if __arm__ | |
239 | #define set_event() do{__builtin_arm_dsb(DSB_ISHST);__builtin_arm_sev();}while(0) | |
240 | #define LOCK_SNOOP_SPINS 4 | |
241 | #else | |
242 | #define set_event() do{}while(0) // arm64 sev is implicit in stlxr | |
243 | #define LOCK_SNOOP_SPINS 0x300 | |
244 | #endif | |
245 | ||
246 | #else | |
247 | ||
248 | #define wait_for_event() __builtin_arm_clrex() | |
249 | #define set_event() do{}while(0) | |
250 | #define LOCK_SNOOP_SPINS 0x300 | |
251 | ||
252 | #endif // __ARM_ENABLE_WFE_ | |
253 | ||
254 | #if LOCK_PRIVATE | |
255 | ||
256 | #define LOCK_PANIC_TIMEOUT 0xc00000 // 12.5 m ticks ~= 524ms with 24MHz OSC | |
257 | ||
258 | #define PLATFORM_LCK_ILOCK LCK_ILOCK | |
259 | ||
260 | #if defined(__ARM_ARCH_8_2__) | |
261 | #define __ARM_ATOMICS_8_1 1 // ARMv8.1 atomic instructions are available | |
262 | #endif | |
263 | ||
264 | /* | |
265 | * Lock state to thread pointer | |
266 | * Clear the bottom bits | |
267 | */ | |
268 | #define LCK_MTX_STATE_TO_THREAD(s) (thread_t)(s & ~(LCK_ILOCK | ARM_LCK_WAITERS)) | |
269 | /* | |
270 | * Thread pointer to lock state | |
271 | * arm thread pointers are aligned such that the bottom two bits are clear | |
272 | */ | |
273 | #define LCK_MTX_THREAD_TO_STATE(t) ((uintptr_t)t) | |
274 | /* | |
275 | * Thread pointer mask | |
276 | */ | |
277 | #define LCK_MTX_THREAD_MASK (~(uintptr_t)(LCK_ILOCK | ARM_LCK_WAITERS)) | |
278 | ||
279 | #define disable_preemption_for_thread(t) os_atomic_store(&(t->machine.preemption_count), t->machine.preemption_count + 1, compiler_acq_rel) | |
280 | #define preemption_disabled_for_thread(t) (t->machine.preemption_count > 0) | |
281 | ||
282 | ||
283 | __unused static void | |
284 | disable_interrupts_noread(void) | |
285 | { | |
286 | #if __arm__ | |
287 | __asm__ volatile ("cpsid if" ::: "memory"); // Mask IRQ FIQ | |
288 | #else | |
289 | __builtin_arm_wsr64("DAIFSet", (DAIFSC_IRQF | DAIFSC_FIQF)); // Mask IRQ FIQ | |
290 | #endif | |
291 | } | |
292 | ||
293 | __unused static inline long | |
294 | get_interrupts(void) | |
295 | { | |
296 | long state; | |
297 | ||
298 | #if __arm__ | |
299 | __asm__ volatile ("mrs %[state], cpsr" :[state] "=r" (state)); // Read cpsr | |
300 | #else | |
301 | state = (long)__builtin_arm_rsr64("DAIF"); // Read interrupt state | |
302 | #endif | |
303 | return state; | |
304 | } | |
305 | ||
306 | __unused static inline long | |
307 | disable_interrupts(void) | |
308 | { | |
309 | long state; | |
310 | ||
311 | state = get_interrupts(); // Get previous state | |
312 | disable_interrupts_noread(); // Disable | |
313 | return state; | |
314 | } | |
315 | ||
316 | __unused static inline void | |
317 | restore_interrupts(long state) | |
318 | { | |
319 | #if __arm__ | |
320 | __asm__ volatile ("msr cpsr, %[state]" :: [state] "r" (state) : "cc", "memory"); // Restore CPSR | |
321 | #elif __arm64__ | |
322 | __builtin_arm_wsr64("DAIF", (uint64_t)state); // Restore masks | |
323 | #endif | |
324 | } | |
325 | ||
326 | #endif // LOCK_PRIVATE | |
327 | ||
328 | #else | |
329 | #ifdef KERNEL_PRIVATE | |
330 | typedef struct { | |
331 | uintptr_t opaque[2]; | |
332 | } lck_rw_t; | |
333 | #else | |
334 | typedef struct __lck_rw_t__ lck_rw_t; | |
335 | #endif | |
336 | #endif | |
337 | ||
338 | #endif /* _ARM_LOCKS_H_ */ |