summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/acpi/sleep.c
blob: ff93bc1b09c3aedd1a83a9e2e94952b56aef4fff (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
/*
 * sleep.c - x86-specific ACPI sleep support.
 *
 *  Copyright (C) 2001-2003 Patrick Mochel
 *  Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz>
 */

#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/dmi.h>
#include <linux/cpumask.h>
#include <asm/segment.h>
#include <asm/desc.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>

#include "realmode/wakeup.h"
#include "sleep.h"

unsigned long acpi_realmode_flags;

#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
static char temp_stack[4096];
#endif

/**
 * acpi_suspend_lowlevel - save kernel state
 *
 * Create an identity mapped page table and copy the wakeup routine to
 * low memory.
 */
int acpi_suspend_lowlevel(void)
{
	struct wakeup_header *header;
	/* address in low memory of the wakeup routine. */
	char *acpi_realmode;

	acpi_realmode = TRAMPOLINE_SYM(acpi_wakeup_code);

	header = (struct wakeup_header *)(acpi_realmode + WAKEUP_HEADER_OFFSET);
	if (header->signature != WAKEUP_HEADER_SIGNATURE) {
		printk(KERN_ERR "wakeup header does not match\n");
		return -EINVAL;
	}

	header->video_mode = saved_video_mode;

	header->wakeup_jmp_seg = acpi_wakeup_address >> 4;

	/*
	 * Set up the wakeup GDT.  We set these up as Big Real Mode,
	 * that is, with limits set to 4 GB.  At least the Lenovo
	 * Thinkpad X61 is known to need this for the video BIOS
	 * initialization quirk to work; this is likely to also
	 * be the case for other laptops or integrated video devices.
	 */

	/* GDT[0]: GDT self-pointer */
	header->wakeup_gdt[0] =
		(u64)(sizeof(header->wakeup_gdt) - 1) +
		((u64)__pa(&header->wakeup_gdt) << 16);
	/* GDT[1]: big real mode-like code segment */
	header->wakeup_gdt[1] =
		GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
	/* GDT[2]: big real mode-like data segment */
	header->wakeup_gdt[2] =
		GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);

#ifndef CONFIG_64BIT
	store_gdt((struct desc_ptr *)&header->pmode_gdt);

	if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
		       &header->pmode_efer_high))
		header->pmode_efer_low = header->pmode_efer_high = 0;
#endif /* !CONFIG_64BIT */

	header->pmode_cr0 = read_cr0();
	header->pmode_cr4 = read_cr4_safe();
	header->realmode_flags = acpi_realmode_flags;
	header->real_magic = 0x12345678;

#ifndef CONFIG_64BIT
	header->pmode_entry = (u32)&wakeup_pmode_return;
	header->pmode_cr3 = (u32)__pa(&initial_page_table);
	saved_magic = 0x12345678;
#else /* CONFIG_64BIT */
	header->trampoline_segment = trampoline_address() >> 4;
#ifdef CONFIG_SMP
	stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
	early_gdt_descr.address =
			(unsigned long)get_cpu_gdt_table(smp_processor_id());
	initial_gs = per_cpu_offset(smp_processor_id());
#endif
	initial_code = (unsigned long)wakeup_long64;
       saved_magic = 0x123456789abcdef0L;
#endif /* CONFIG_64BIT */

	do_suspend_lowlevel();
	return 0;
}

static int __init acpi_sleep_setup(char *str)
{
	while ((str != NULL) && (*str != '\0')) {
		if (strncmp(str, "s3_bios", 7) == 0)
			acpi_realmode_flags |= 1;
		if (strncmp(str, "s3_mode", 7) == 0)
			acpi_realmode_flags |= 2;
		if (strncmp(str, "s3_beep", 7) == 0)
			acpi_realmode_flags |= 4;
#ifdef CONFIG_HIBERNATION
		if (strncmp(str, "s4_nohwsig", 10) == 0)
			acpi_no_s4_hw_signature();
		if (strncmp(str, "s4_nonvs", 8) == 0) {
			pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
					"please use acpi_sleep=nonvs instead");
			acpi_nvs_nosave();
		}
#endif
		if (strncmp(str, "nonvs", 5) == 0)
			acpi_nvs_nosave();
		if (strncmp(str, "old_ordering", 12) == 0)
			acpi_old_suspend_ordering();
		str = strchr(str, ',');
		if (str != NULL)
			str += strspn(str, ", \t");
	}
	return 1;
}

__setup("acpi_sleep=", acpi_sleep_setup);
OpenPOWER on IntegriCloud