- patches.rt/0001-sched-count-of-queued-RT-tasks.patch: Delete.
[linux-flexiantxendom0-3.2.10.git] / arch / x86 / kernel / acpi / sleep_64-xen.c
1 /*
2  *  acpi.c - Architecture-Specific Low-Level ACPI Support
3  *
4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
6  *  Copyright (C) 2001 Patrick Mochel <mochel@osdl.org>
7  *  Copyright (C) 2002 Andi Kleen, SuSE Labs (x86-64 port)
8  *  Copyright (C) 2003 Pavel Machek, SuSE Labs
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  *
12  *  This program is free software; you can redistribute it and/or modify
13  *  it under the terms of the GNU General Public License as published by
14  *  the Free Software Foundation; either version 2 of the License, or
15  *  (at your option) any later version.
16  *
17  *  This program is distributed in the hope that it will be useful,
18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  *  GNU General Public License for more details.
21  *
22  *  You should have received a copy of the GNU General Public License
23  *  along with this program; if not, write to the Free Software
24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
25  *
26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27  */
28
29 #include <linux/kernel.h>
30 #include <linux/init.h>
31 #include <linux/types.h>
32 #include <linux/stddef.h>
33 #include <linux/slab.h>
34 #include <linux/pci.h>
35 #include <linux/bootmem.h>
36 #include <linux/acpi.h>
37 #include <linux/cpumask.h>
38
39 #include <asm/mpspec.h>
40 #include <asm/io.h>
41 #include <asm/apic.h>
42 #include <asm/apicdef.h>
43 #include <asm/page.h>
44 #include <asm/pgtable.h>
45 #include <asm/pgalloc.h>
46 #include <asm/io_apic.h>
47 #include <asm/proto.h>
48 #include <asm/tlbflush.h>
49
50 /* --------------------------------------------------------------------------
51                               Low-Level Sleep Support
52    -------------------------------------------------------------------------- */
53
54 #ifndef CONFIG_ACPI_PV_SLEEP
55 /* address in low memory of the wakeup routine. */
56 unsigned long acpi_wakeup_address = 0;
57 unsigned long acpi_realmode_flags;
58 extern char wakeup_start, wakeup_end;
59
60 extern unsigned long acpi_copy_wakeup_routine(unsigned long);
61 #endif
62
63 /**
64  * acpi_save_state_mem - save kernel state
65  *
66  * Create an identity mapped page table and copy the wakeup routine to
67  * low memory.
68  */
69 int acpi_save_state_mem(void)
70 {
71 #ifndef CONFIG_ACPI_PV_SLEEP
72         memcpy((void *)acpi_wakeup_address, &wakeup_start,
73                &wakeup_end - &wakeup_start);
74         acpi_copy_wakeup_routine(acpi_wakeup_address);
75 #endif
76         return 0;
77 }
78
79 /*
80  * acpi_restore_state
81  */
82 void acpi_restore_state_mem(void)
83 {
84 }
85
86 /**
87  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
88  *
89  * We allocate a page in low memory for the wakeup
90  * routine for when we come back from a sleep state. The
91  * runtime allocator allows specification of <16M pages, but not
92  * <1M pages.
93  */
94 void __init acpi_reserve_bootmem(void)
95 {
96 #ifndef CONFIG_ACPI_PV_SLEEP
97         acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
98         if ((&wakeup_end - &wakeup_start) > (PAGE_SIZE*2))
99                 printk(KERN_CRIT
100                        "ACPI: Wakeup code way too big, will crash on attempt"
101                        " to suspend\n");
102 #endif
103 }
104
105 #ifndef CONFIG_ACPI_PV_SLEEP
106 static int __init acpi_sleep_setup(char *str)
107 {
108         while ((str != NULL) && (*str != '\0')) {
109                 if (strncmp(str, "s3_bios", 7) == 0)
110                         acpi_realmode_flags |= 1;
111                 if (strncmp(str, "s3_mode", 7) == 0)
112                         acpi_realmode_flags |= 2;
113                 if (strncmp(str, "s3_beep", 7) == 0)
114                         acpi_realmode_flags |= 4;
115                 str = strchr(str, ',');
116                 if (str != NULL)
117                         str += strspn(str, ", \t");
118         }
119
120         return 1;
121 }
122
123 __setup("acpi_sleep=", acpi_sleep_setup);
124
125 #else /* CONFIG_ACPI_PV_SLEEP */
126 #include <asm/hypervisor.h>
127 #include <xen/interface/platform.h>
128 int acpi_notify_hypervisor_state(u8 sleep_state,
129         u32 pm1a_cnt, u32 pm1b_cnt)
130 {
131         struct xen_platform_op op = {
132                 .cmd = XENPF_enter_acpi_sleep,
133                 .interface_version = XENPF_INTERFACE_VERSION,
134                 .u = {
135                         .enter_acpi_sleep = {
136                                 .pm1a_cnt_val = (u16)pm1a_cnt,
137                                 .pm1b_cnt_val = (u16)pm1b_cnt,
138                                 .sleep_state = sleep_state,
139                         },
140                 },
141         };
142
143         return HYPERVISOR_platform_op(&op);
144 }
145 #endif                          /* CONFIG_ACPI_PV_SLEEP */
146