1 | /* $NetBSD: acpi_func.h,v 1.4 2010/07/24 21:53:54 jruoho 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 |
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 | |
66 | return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY); |
67 | } |
68 | |
69 | static inline int |
70 | acpi_release_global_lock(uint32_t *lock) |
71 | { |
72 | uint32_t new, old, val; |
73 | |
74 | do { |
75 | old = *lock; |
76 | new = old & ~GL_BIT_MASK; |
77 | val = atomic_cas_32(lock, old, new); |
78 | } while (__predict_false(val != old)); |
79 | |
80 | return old & GL_BIT_PENDING; |
81 | } |
82 | |
83 | /* |
84 | * XXX: Should be in a MD header. |
85 | */ |
86 | #ifndef __ia64__ |
87 | #define ACPI_FLUSH_CPU_CACHE() wbinvd() |
88 | #else |
89 | #define ACPI_FLUSH_CPU_CACHE() /* XXX: ia64_fc()? */ |
90 | #endif |
91 | |
92 | #endif /* !_SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H */ |
93 | |