1 /* $NetBSD: acpi_func.h,v 1.7 2023/05/10 01:23:27 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 2000 Michael Smith
5 * Copyright (c) 2000 BSDi
6 * Copyright (c) 2007-2009 Jung-uk Kim <jkim@FreeBSD.org>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #ifndef _SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H
32 #define _SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H
33
34 #include <machine/cpufunc.h>
35
36 #include <sys/atomic.h>
37
38 #define GL_ACQUIRED (-1)
39 #define GL_BUSY 0
40 #define GL_BIT_PENDING 1
41 #define GL_BIT_OWNED 2
42 #define GL_BIT_MASK (GL_BIT_PENDING | GL_BIT_OWNED)
43
44 #define ACPI_ACQUIRE_GLOBAL_LOCK(GLptr, Acq) \
45 do { \
46 (Acq) = acpi_acquire_global_lock(&((GLptr)->GlobalLock)); \
47 } while (0)
48
49 #define ACPI_RELEASE_GLOBAL_LOCK(GLptr, Acq) \
50 do { \
51 (Acq) = acpi_release_global_lock(&((GLptr)->GlobalLock)); \
52 } while (0)
53
54 static __inline int
acpi_acquire_global_lock(uint32_t * lock)55 acpi_acquire_global_lock(uint32_t *lock)
56 {
57 uint32_t new, old, val;
58
59 do {
60 old = *lock;
61 new = ((old & ~GL_BIT_MASK) | GL_BIT_OWNED) |
62 ((old >> 1) & GL_BIT_PENDING);
63 val = atomic_cas_32(lock, old, new);
64 } while (__predict_false(val != old));
65 membar_acquire();
66
67 return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY);
68 }
69
70 static __inline int
acpi_release_global_lock(uint32_t * lock)71 acpi_release_global_lock(uint32_t *lock)
72 {
73 uint32_t new, old, val;
74
75 membar_release();
76 do {
77 old = *lock;
78 new = old & ~GL_BIT_MASK;
79 val = atomic_cas_32(lock, old, new);
80 } while (__predict_false(val != old));
81
82 return old & GL_BIT_PENDING;
83 }
84
85 /*
86 * XXX: Should be in a MD header.
87 */
88 #if defined(__ia64__)
89 #define ACPI_FLUSH_CPU_CACHE() /* XXX: ia64_fc()? */
90 #elif defined(__aarch64__)
91 #define ACPI_FLUSH_CPU_CACHE() cpu_dcache_wbinv_all()
92 #else
93 #define ACPI_FLUSH_CPU_CACHE() wbinvd()
94 #endif
95
96 #endif /* !_SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H */
97