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

INCLUDED FROM

DEFINITIONS

1. ia64_acpi_acquire_global_lock
2. ia64_acpi_release_global_lock

   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 */