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 #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 */