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 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 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