kernel/arch/ia64/include/asm/acenv.h

   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 */