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 <lv.zheng@intel.com>
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 ""(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 : ""(n_hi), "1"(n_lo))
53
54 #endif /* _ASM_X86_ACENV_H */
55
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