text: /*
   * X86 specific ACPICA environments and implementation
   *
   * Copyright (C) 2014, Intel Corporation
   *   Author: Lv Zheng <lv.zheng@intel.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #ifndef _ASM_X86_ACENV_H
  #define _ASM_X86_ACENV_H
  
  #include <asm/special_insns.h>
  
  /* Asm macros */
  
  #define ACPI_FLUSH_CPU_CACHE()	wbinvd()
  
  #ifdef CONFIG_ACPI
  
  int __acpi_acquire_global_lock(unsigned int *lock);
  int __acpi_release_global_lock(unsigned int *lock);
  
  #define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq) \
  	((Acq) = __acpi_acquire_global_lock(&facs->global_lock))
  
  #define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq) \
  	((Acq) = __acpi_release_global_lock(&facs->global_lock))
  
  /*
   * Math helper asm macros
   */
  #define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
  	asm("divl %2;"				     \
  	    : "=a"(q32), "=d"(r32)		     \
  	    : "r"(d32),				     \
  	     "0"(n_lo), "1"(n_hi))
  
  #define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
  	asm("shrl   $1,%2	;"	\
  	    "rcrl   $1,%3;"		\
  	    : "=r"(n_hi), "=r"(n_lo)	\
  	    : "0"(n_hi), "1"(n_lo))
  
  #endif
  
  #endif /* _ASM_X86_ACENV_H */
  