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