1/*	$NetBSD: acpi_func.h,v 1.3 2010/07/24 09:35:36 jruoho 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: 1.4 $
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/* Section 5.2.9.1:  global lock acquire/release functions */
52extern int	acpi_acquire_global_lock(uint32_t *lock);
53extern int	acpi_release_global_lock(uint32_t *lock);
54#define ACPI_ACQUIRE_GLOBAL_LOCK(GLptr, Acq) \
55		((Acq) = acpi_acquire_global_lock(GLptr))
56#define ACPI_RELEASE_GLOBAL_LOCK(GLptr, Acq) \
57		((Acq) = acpi_release_global_lock(GLptr))
58
59
60/* Section 5.2.9.1:  global lock acquire/release functions */
61#define GL_ACQUIRED	(-1)
62#define GL_BUSY		0
63#define GL_BIT_PENDING	0x1
64#define GL_BIT_OWNED	0x2
65#define GL_BIT_MASK	(GL_BIT_PENDING | GL_BIT_OWNED)
66
67/*
68 * Acquire the global lock.  If busy, set the pending bit.  The caller
69 * will wait for notification from the BIOS that the lock is available
70 * and then attempt to acquire it again.
71 */
72int
73acpi_acquire_global_lock(uint32_t *lock)
74{
75	uint32_t new, old;
76
77	do {
78		old = *lock;
79		new = ((old & ~GL_BIT_MASK) | GL_BIT_OWNED) |
80			((old >> 1) & GL_BIT_PENDING);
81	} while (atomic_cmpset_acq_int(lock, old, new) == 0);
82
83	return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY);
84}
85
86/*
87 * Release the global lock, returning whether there is a waiter pending.
88 * If the BIOS set the pending bit, OSPM must notify the BIOS when it
89 * releases the lock.
90 */
91int
92acpi_release_global_lock(uint32_t *lock)
93{
94	uint32_t new, old;
95
96	do {
97		old = *lock;
98		new = old & ~GL_BIT_MASK;
99	} while (atomic_cmpset_rel_int(lock, old, new) == 0);
100
101	return (old & GL_BIT_PENDING);
102}
103
104#endif /* _IA64_ACPI_FUNC_H_ */
105