1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * IA64 specific ACPICA environments and implementation
4 *
5 * Copyright (C) 2014, Intel Corporation
6 * Author: Lv Zheng <lv.zheng@intel.com>
7 */
8
9 #ifndef _ASM_IA64_ACENV_H
10 #define _ASM_IA64_ACENV_H
11
12 #include <asm/intrinsics.h>
13
14 #define COMPILER_DEPENDENT_INT64 long
15 #define COMPILER_DEPENDENT_UINT64 unsigned long
16
17 /* Asm macros */
18
19 static inline int
ia64_acpi_acquire_global_lock(unsigned int * lock)20 ia64_acpi_acquire_global_lock(unsigned int *lock)
21 {
22 unsigned int old, new, val;
23 do {
24 old = *lock;
25 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
26 val = ia64_cmpxchg4_acq(lock, new, old);
27 } while (unlikely (val != old));
28 return (new < 3) ? -1 : 0;
29 }
30
31 static inline int
ia64_acpi_release_global_lock(unsigned int * lock)32 ia64_acpi_release_global_lock(unsigned int *lock)
33 {
34 unsigned int old, new, val;
35 do {
36 old = *lock;
37 new = old & ~0x3;
38 val = ia64_cmpxchg4_acq(lock, new, old);
39 } while (unlikely (val != old));
40 return old & 0x1;
41 }
42
43 #define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq) \
44 ((Acq) = ia64_acpi_acquire_global_lock(&facs->global_lock))
45
46 #define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq) \
47 ((Acq) = ia64_acpi_release_global_lock(&facs->global_lock))
48
49 #endif /* _ASM_IA64_ACENV_H */
50