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