1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * IA64 specific ACPICA environments and implementation
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2014, Intel Corporation
6*4882a593Smuzhiyun * Author: Lv Zheng <lv.zheng@intel.com>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #ifndef _ASM_IA64_ACENV_H
10*4882a593Smuzhiyun #define _ASM_IA64_ACENV_H
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <asm/intrinsics.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define COMPILER_DEPENDENT_INT64 long
15*4882a593Smuzhiyun #define COMPILER_DEPENDENT_UINT64 unsigned long
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun /* Asm macros */
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static inline int
ia64_acpi_acquire_global_lock(unsigned int * lock)20*4882a593Smuzhiyun ia64_acpi_acquire_global_lock(unsigned int *lock)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun unsigned int old, new, val;
23*4882a593Smuzhiyun do {
24*4882a593Smuzhiyun old = *lock;
25*4882a593Smuzhiyun new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1));
26*4882a593Smuzhiyun val = ia64_cmpxchg4_acq(lock, new, old);
27*4882a593Smuzhiyun } while (unlikely (val != old));
28*4882a593Smuzhiyun return (new < 3) ? -1 : 0;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun static inline int
ia64_acpi_release_global_lock(unsigned int * lock)32*4882a593Smuzhiyun ia64_acpi_release_global_lock(unsigned int *lock)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun unsigned int old, new, val;
35*4882a593Smuzhiyun do {
36*4882a593Smuzhiyun old = *lock;
37*4882a593Smuzhiyun new = old & ~0x3;
38*4882a593Smuzhiyun val = ia64_cmpxchg4_acq(lock, new, old);
39*4882a593Smuzhiyun } while (unlikely (val != old));
40*4882a593Smuzhiyun return old & 0x1;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun #define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq) \
44*4882a593Smuzhiyun ((Acq) = ia64_acpi_acquire_global_lock(&facs->global_lock))
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun #define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq) \
47*4882a593Smuzhiyun ((Acq) = ia64_acpi_release_global_lock(&facs->global_lock))
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun #endif /* _ASM_IA64_ACENV_H */
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