2 * X86 specific ACPICA environments and implementation
4 * Copyright (C) 2014, Intel Corporation
5 * Author: Lv Zheng <lv.zheng@intel.com>
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.
12 #ifndef _ASM_X86_ACENV_H
13 #define _ASM_X86_ACENV_H
15 #include <asm/special_insns.h>
20 * ACPI_FLUSH_CPU_CACHE() flushes caches on entering sleep states.
21 * It is required to prevent data loss.
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.
27 #define ACPI_FLUSH_CPU_CACHE() \
29 if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) \
33 int __acpi_acquire_global_lock(unsigned int *lock);
34 int __acpi_release_global_lock(unsigned int *lock);
36 #define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq) \
37 ((Acq) = __acpi_acquire_global_lock(&facs->global_lock))
39 #define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq) \
40 ((Acq) = __acpi_release_global_lock(&facs->global_lock))
43 * Math helper asm macros
45 #define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
47 : "=a"(q32), "=d"(r32) \
51 #define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
54 : "=r"(n_hi), "=r"(n_lo) \
55 : "0"(n_hi), "1"(n_lo))
57 #endif /* _ASM_X86_ACENV_H */