summaryrefslogtreecommitdiffstats
path: root/arch/x86_64/kernel/acpi/sleep.c
blob: 091bc79c888f6dac8873c1f420d42f17c390351f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*
 *  acpi.c - Architecture-Specific Low-Level ACPI Support
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
 *  Copyright (C) 2001 Patrick Mochel <mochel@osdl.org>
 *  Copyright (C) 2002 Andi Kleen, SuSE Labs (x86-64 port)
 *  Copyright (C) 2003 Pavel Machek, SuSE Labs
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/bootmem.h>
#include <linux/acpi.h>
#include <linux/cpumask.h>

#include <asm/mpspec.h>
#include <asm/io.h>
#include <asm/apic.h>
#include <asm/apicdef.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/io_apic.h>
#include <asm/proto.h>
#include <asm/tlbflush.h>

/* --------------------------------------------------------------------------
                              Low-Level Sleep Support
   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_SLEEP

/* address in low memory of the wakeup routine. */
unsigned long acpi_wakeup_address = 0;
unsigned long acpi_video_flags;
extern char wakeup_start, wakeup_end;

extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));

static pgd_t low_ptr;

static void init_low_mapping(void)
{
	pgd_t *slot0 = pgd_offset(current->mm, 0UL);
	low_ptr = *slot0;
	set_pgd(slot0, *pgd_offset(current->mm, PAGE_OFFSET));
	WARN_ON(num_online_cpus() != 1);
	local_flush_tlb();
}

/**
 * acpi_save_state_mem - save kernel state
 *
 * Create an identity mapped page table and copy the wakeup routine to
 * low memory.
 */
int acpi_save_state_mem(void)
{
	init_low_mapping();

	memcpy((void *)acpi_wakeup_address, &wakeup_start,
	       &wakeup_end - &wakeup_start);
	acpi_copy_wakeup_routine(acpi_wakeup_address);

	return 0;
}

/*
 * acpi_restore_state
 */
void acpi_restore_state_mem(void)
{
	set_pgd(pgd_offset(current->mm, 0UL), low_ptr);
	local_flush_tlb();
}

/**
 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
 *
 * We allocate a page in low memory for the wakeup
 * routine for when we come back from a sleep state. The
 * runtime allocator allows specification of <16M pages, but not
 * <1M pages.
 */
void __init acpi_reserve_bootmem(void)
{
	acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
	if ((&wakeup_end - &wakeup_start) > PAGE_SIZE)
		printk(KERN_CRIT
		       "ACPI: Wakeup code way too big, will crash on attempt to suspend\n");
}

static int __init acpi_sleep_setup(char *str)
{
	while ((str != NULL) && (*str != '\0')) {
		if (strncmp(str, "s3_bios", 7) == 0)
			acpi_video_flags = 1;
		if (strncmp(str, "s3_mode", 7) == 0)
			acpi_video_flags |= 2;
		str = strchr(str, ',');
		if (str != NULL)
			str += strspn(str, ", \t");
	}
	return 1;
}

__setup("acpi_sleep=", acpi_sleep_setup);

#endif				/*CONFIG_ACPI_SLEEP */

void acpi_pci_link_exit(void)
{
}
OpenPOWER on IntegriCloud