arch/x86/include/asm/acenv.h

   1 /*
   2  * X86 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_X86_ACENV_H
  13 #define _ASM_X86_ACENV_H
  14
  15 #include <asm/special_insns.h>
  16
  17 /* Asm macros */
  18
  19 /*
  20  * ACPI_FLUSH_CPU_CACHE() flushes caches on entering sleep states.
  21  * It is required to prevent data loss.
  22  *
  23  * While running inside virtual machine, the kernel can bypass cache flushing.
  24  * Changing sleep state in a virtual machine doesn't affect the host system
  25  * sleep state and cannot lead to data loss.
  26  */
  27 #define ACPI_FLUSH_CPU_CACHE()                                  \
  28 do {                                                            \
  29         if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR))       \
  30                 wbinvd();                                       \
  31 } while (0)
  32
  33 int __acpi_acquire_global_lock(unsigned int *lock);
  34 int __acpi_release_global_lock(unsigned int *lock);
  35
  36 #define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq) \
  37         ((Acq) = __acpi_acquire_global_lock(&facs->global_lock))
  38
  39 #define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq) \
  40         ((Acq) = __acpi_release_global_lock(&facs->global_lock))
  41
  42 /*
  43  * Math helper asm macros
  44  */
  45 #define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
  46         asm("divl %2;"                               \
  47             : "=a"(q32), "=d"(r32)                   \
  48             : "r"(d32),                              \
  49              "0"(n_lo), "1"(n_hi))
  50
  51 #define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
  52         asm("shrl   $1,%2       ;"      \
  53             "rcrl   $1,%3;"             \
  54             : "=r"(n_hi), "=r"(n_lo)    \
  55             : "0"(n_hi), "1"(n_lo))
  56
  57 #endif /* _ASM_X86_ACENV_H */