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 22 #ifdef CONFIG_ACPI 23 24 static inline int 25 ia64_acpi_acquire_global_lock(unsigned int *lock) 26 { 27 unsigned int old, new, val; 28 do { 29 old = *lock; 30 new = (((old & ~0x3) + 2) + ((old >> 1) & 0x1)); 31 val = ia64_cmpxchg4_acq(lock, new, old); 32 } while (unlikely (val != old)); 33 return (new < 3) ? -1 : 0; 34 } 35 36 static inline int 37 ia64_acpi_release_global_lock(unsigned int *lock) 38 { 39 unsigned int old, new, val; 40 do { 41 old = *lock; 42 new = old & ~0x3; 43 val = ia64_cmpxchg4_acq(lock, new, old); 44 } while (unlikely (val != old)); 45 return old & 0x1; 46 } 47 48 #define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq) \ 49 ((Acq) = ia64_acpi_acquire_global_lock(&facs->global_lock)) 50 51 #define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq) \ 52 ((Acq) = ia64_acpi_release_global_lock(&facs->global_lock)) 53 54 #endif 55 56 #endif /* _ASM_IA64_ACENV_H */ 57