arch/x86/include/asm/acenv.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * X86 specific ACPICA environments and implementation
   4  *
   5  * Copyright (C) 2014, Intel Corporation
   6  *   Author: Lv Zheng <[email protected]>
   7  */
   8
   9 #ifndef _ASM_X86_ACENV_H
  10 #define _ASM_X86_ACENV_H
  11
  12 #include <asm/special_insns.h>
  13
  14 /* Asm macros */
  15
  16 /*
  17  * ACPI_FLUSH_CPU_CACHE() flushes caches on entering sleep states.
  18  * It is required to prevent data loss.
  19  *
  20  * While running inside virtual machine, the kernel can bypass cache flushing.
  21  * Changing sleep state in a virtual machine doesn't affect the host system
  22  * sleep state and cannot lead to data loss.
  23  */
  24 #define ACPI_FLUSH_CPU_CACHE()                                  \
  25 do {                                                            \
  26         if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR))       \
  27                 wbinvd();                                       \
  28 } while (0)
  29
  30 int __acpi_acquire_global_lock(unsigned int *lock);
  31 int __acpi_release_global_lock(unsigned int *lock);
  32
  33 #define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq) \
  34         ((Acq) = __acpi_acquire_global_lock(&facs->global_lock))
  35
  36 #define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq) \
  37         ((Acq) = __acpi_release_global_lock(&facs->global_lock))
  38
  39 /*
  40  * Math helper asm macros
  41  */
  42 #define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
  43         asm("divl %2;"                               \
  44             : "=a"(q32), "=d"(r32)                   \
  45             : "r"(d32),                              \
  46              "0"(n_lo), "1"(n_hi))
  47
  48 #define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
  49         asm("shrl   $1,%2       ;"      \
  50             "rcrl   $1,%3;"             \
  51             : "=r"(n_hi), "=r"(n_lo)    \
  52             : "0"(n_hi), "1"(n_lo))
  53
  54 #endif /* _ASM_X86_ACENV_H */