1 /* $NetBSD: acpi_func.h,v 1.2 2006/05/14 21:55:38 elad Exp $ */
2
3 /*-
4 * Copyright (c) 2002 Mitsuru IWASAKI
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: src/sys/ia64/include/acpica_machdep.h,v 1.4 2004/10/11 05:39:15 njl Exp $
29 */
30
31 /******************************************************************************
32 *
33 * Name: acpica_machdep.h - arch-specific defines, etc.
34 * $Revision: 1.2 $
35 *
36 *****************************************************************************/
37
38 #ifndef _IA64_ACPI_FUNC_H_
39 #define _IA64_ACPI_FUNC_H_
40
41 #include <machine/cpufunc.h>
42 #include <machine/atomic.h>
43
44 /* Asm macros */
45
46 #define ACPI_ASM_MACROS
47 #define BREAKPOINT3
48 #define ACPI_DISABLE_IRQS() disable_intr()
49 #define ACPI_ENABLE_IRQS() enable_intr()
50
51 #define ACPI_FLUSH_CPU_CACHE() /* XXX ia64_fc()? */
52
53
54 /* Section 5.2.9.1: global lock acquire/release functions */
55 extern int acpi_acquire_global_lock(uint32_t *lock);
56 extern int acpi_release_global_lock(uint32_t *lock);
57 #define ACPI_ACQUIRE_GLOBAL_LOCK(GLptr, Acq) \
58 ((Acq) = acpi_acquire_global_lock(GLptr))
59 #define ACPI_RELEASE_GLOBAL_LOCK(GLptr, Acq) \
60 ((Acq) = acpi_release_global_lock(GLptr))
61
62
63 /* Section 5.2.9.1: global lock acquire/release functions */
64 #define GL_ACQUIRED (-1)
65 #define GL_BUSY 0
66 #define GL_BIT_PENDING 0x1
67 #define GL_BIT_OWNED 0x2
68 #define GL_BIT_MASK (GL_BIT_PENDING | GL_BIT_OWNED)
69
70 /*
71 * Acquire the global lock. If busy, set the pending bit. The caller
72 * will wait for notification from the BIOS that the lock is available
73 * and then attempt to acquire it again.
74 */
75 int
acpi_acquire_global_lock(uint32_t * lock)76 acpi_acquire_global_lock(uint32_t *lock)
77 {
78 uint32_t new, old;
79
80 do {
81 old = *lock;
82 new = ((old & ~GL_BIT_MASK) | GL_BIT_OWNED) |
83 ((old >> 1) & GL_BIT_PENDING);
84 } while (atomic_cmpset_acq_int(lock, old, new) == 0);
85
86 return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY);
87 }
88
89 /*
90 * Release the global lock, returning whether there is a waiter pending.
91 * If the BIOS set the pending bit, OSPM must notify the BIOS when it
92 * releases the lock.
93 */
94 int
acpi_release_global_lock(uint32_t * lock)95 acpi_release_global_lock(uint32_t *lock)
96 {
97 uint32_t new, old;
98
99 do {
100 old = *lock;
101 new = old & ~GL_BIT_MASK;
102 } while (atomic_cmpset_rel_int(lock, old, new) == 0);
103
104 return (old & GL_BIT_PENDING);
105 }
106
107 #endif /* _IA64_ACPI_FUNC_H_ */
108