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#define ACPI_FLUSH_CPU_CACHE()	wbinvd()
 
 
 
 
 
 
 
 
 
 
 
 
20
21int __acpi_acquire_global_lock(unsigned int *lock);
22int __acpi_release_global_lock(unsigned int *lock);
23
24#define ACPI_ACQUIRE_GLOBAL_LOCK(facs, Acq) \
25	((Acq) = __acpi_acquire_global_lock(&facs->global_lock))
26
27#define ACPI_RELEASE_GLOBAL_LOCK(facs, Acq) \
28	((Acq) = __acpi_release_global_lock(&facs->global_lock))
29
30/*
31 * Math helper asm macros
32 */
33#define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
34	asm("divl %2;"				     \
35	    : "=a"(q32), "=d"(r32)		     \
36	    : "r"(d32),				     \
37	     "0"(n_lo), "1"(n_hi))
38
39#define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
40	asm("shrl   $1,%2	;"	\
41	    "rcrl   $1,%3;"		\
42	    : "=r"(n_hi), "=r"(n_lo)	\
43	    : "0"(n_hi), "1"(n_lo))
44
45#endif /* _ASM_X86_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 <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()					\
25do {								\
26	if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR))	\
27		wbinvd();					\
28} while (0)
29
30int __acpi_acquire_global_lock(unsigned int *lock);
31int __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 */