1/*
2 * IA64 specific ACPICA environments and implementation
3 *
4 * Copyright (C) 2014, Intel Corporation
5 *   Author: Lv Zheng <lv.zheng@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#ifndef _ASM_IA64_ACENV_H
13#define _ASM_IA64_ACENV_H
14
15#include <asm/intrinsics.h>
16
17#define COMPILER_DEPENDENT_INT64	long
18#define COMPILER_DEPENDENT_UINT64	unsigned long
19
20/* Asm macros */
21
22static inline int
23ia64_acpi_acquire_global_lock(unsigned int *lock)
24{
25	unsigned int old, new, val;
26	do {
27		old = *lock;
28		new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
29		val = ia64_cmpxchg4_acq(lock, new, old);
30	} while (unlikely (val != old));
31	return (new < 3) ? -1 : 0;
32}
33
34static inline int
35ia64_acpi_release_global_lock(unsigned int *lock)
36{
37	unsigned int old, new, val;
38	do {
39		old = *lock;
40		new = old & ~0x3;
41		val = ia64_cmpxchg4_acq(lock, new, old);
42	} while (unlikely (val != old));
43	return old & 0x1;
44}
45
46#define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq)				\
47	((Acq) = ia64_acpi_acquire_global_lock(&facs->global_lock))
48
49#define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq)				\
50	((Acq) = ia64_acpi_release_global_lock(&facs->global_lock))
51
52#endif /* _ASM_IA64_ACENV_H */
53