1 /******************************************************************************
2  * acpi.h
3  * acpi file for domain 0 kernel
4  *
5  * Copyright (c) 2011 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
6  * Copyright (c) 2011 Yu Ke <ke.yu@intel.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License version 2
10  * as published by the Free Software Foundation; or, when distributed
11  * separately from the Linux kernel or incorporated into other
12  * software packages, subject to the following license:
13  *
14  * Permission is hereby granted, free of charge, to any person obtaining a copy
15  * of this source file (the "Software"), to deal in the Software without
16  * restriction, including without limitation the rights to use, copy, modify,
17  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
18  * and to permit persons to whom the Software is furnished to do so, subject to
19  * the following conditions:
20  *
21  * The above copyright notice and this permission notice shall be included in
22  * all copies or substantial portions of the Software.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30  * IN THE SOFTWARE.
31  */
32 
33 #ifndef _XEN_ACPI_H
34 #define _XEN_ACPI_H
35 
36 #include <linux/types.h>
37 
38 #ifdef CONFIG_XEN_DOM0
39 #include <asm/xen/hypervisor.h>
40 #include <xen/xen.h>
41 #include <linux/acpi.h>
42 
43 int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
44 				     u32 pm1a_cnt, u32 pm1b_cnd);
45 int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
46 				     u32 val_a, u32 val_b);
47 
xen_acpi_suspend_lowlevel(void)48 static inline int xen_acpi_suspend_lowlevel(void)
49 {
50 	/*
51 	* Xen will save and restore CPU context, so
52 	* we can skip that and just go straight to
53 	* the suspend.
54 	*/
55 	acpi_enter_sleep_state(ACPI_STATE_S3);
56 	return 0;
57 }
58 
xen_acpi_sleep_register(void)59 static inline void xen_acpi_sleep_register(void)
60 {
61 	if (xen_initial_domain()) {
62 		acpi_os_set_prepare_sleep(
63 			&xen_acpi_notify_hypervisor_sleep);
64 		acpi_os_set_prepare_extended_sleep(
65 			&xen_acpi_notify_hypervisor_extended_sleep);
66 
67 		acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel;
68 	}
69 }
70 #else
xen_acpi_sleep_register(void)71 static inline void xen_acpi_sleep_register(void)
72 {
73 }
74 #endif
75 
76 #endif	/* _XEN_ACPI_H */
77