1/*
2 * sleep.c - x86-specific ACPI sleep support.
3 *
4 *  Copyright (C) 2001-2003 Patrick Mochel
5 *  Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz>
6 */
7
8#include <linux/acpi.h>
9#include <linux/bootmem.h>
10#include <linux/memblock.h>
11#include <linux/dmi.h>
12#include <linux/cpumask.h>
13#include <asm/segment.h>
14#include <asm/desc.h>
15#include <asm/pgtable.h>
16#include <asm/cacheflush.h>
17#include <asm/realmode.h>
18
19#include "../../realmode/rm/wakeup.h"
20#include "sleep.h"
21
22unsigned long acpi_realmode_flags;
23
24#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
25static char temp_stack[4096];
26#endif
27
28/**
29 * x86_acpi_enter_sleep_state - enter sleep state
30 * @state: Sleep state to enter.
31 *
32 * Wrapper around acpi_enter_sleep_state() to be called by assmebly.
33 */
34acpi_status asmlinkage __visible x86_acpi_enter_sleep_state(u8 state)
35{
36	return acpi_enter_sleep_state(state);
37}
38
39/**
40 * x86_acpi_suspend_lowlevel - save kernel state
41 *
42 * Create an identity mapped page table and copy the wakeup routine to
43 * low memory.
44 */
45int x86_acpi_suspend_lowlevel(void)
46{
47	struct wakeup_header *header =
48		(struct wakeup_header *) __va(real_mode_header->wakeup_header);
49
50	if (header->signature != WAKEUP_HEADER_SIGNATURE) {
51		printk(KERN_ERR "wakeup header does not match\n");
52		return -EINVAL;
53	}
54
55	header->video_mode = saved_video_mode;
56
57	header->pmode_behavior = 0;
58
59#ifndef CONFIG_64BIT
60	native_store_gdt((struct desc_ptr *)&header->pmode_gdt);
61
62	/*
63	 * We have to check that we can write back the value, and not
64	 * just read it.  At least on 90 nm Pentium M (Family 6, Model
65	 * 13), reading an invalid MSR is not guaranteed to trap, see
66	 * Erratum X4 in "Intel Pentium M Processor on 90 nm Process
67	 * with 2-MB L2 Cache and Intel® Processor A100 and A110 on 90
68	 * nm process with 512-KB L2 Cache Specification Update".
69	 */
70	if (!rdmsr_safe(MSR_EFER,
71			&header->pmode_efer_low,
72			&header->pmode_efer_high) &&
73	    !wrmsr_safe(MSR_EFER,
74			header->pmode_efer_low,
75			header->pmode_efer_high))
76		header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER);
77#endif /* !CONFIG_64BIT */
78
79	header->pmode_cr0 = read_cr0();
80	if (__this_cpu_read(cpu_info.cpuid_level) >= 0) {
81		header->pmode_cr4 = read_cr4();
82		header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4);
83	}
84	if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
85			&header->pmode_misc_en_low,
86			&header->pmode_misc_en_high) &&
87	    !wrmsr_safe(MSR_IA32_MISC_ENABLE,
88			header->pmode_misc_en_low,
89			header->pmode_misc_en_high))
90		header->pmode_behavior |=
91			(1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
92	header->realmode_flags = acpi_realmode_flags;
93	header->real_magic = 0x12345678;
94
95#ifndef CONFIG_64BIT
96	header->pmode_entry = (u32)&wakeup_pmode_return;
97	header->pmode_cr3 = (u32)__pa_symbol(initial_page_table);
98	saved_magic = 0x12345678;
99#else /* CONFIG_64BIT */
100#ifdef CONFIG_SMP
101	stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
102	early_gdt_descr.address =
103			(unsigned long)get_cpu_gdt_table(smp_processor_id());
104	initial_gs = per_cpu_offset(smp_processor_id());
105#endif
106	initial_code = (unsigned long)wakeup_long64;
107       saved_magic = 0x123456789abcdef0L;
108#endif /* CONFIG_64BIT */
109
110	do_suspend_lowlevel();
111	return 0;
112}
113
114static int __init acpi_sleep_setup(char *str)
115{
116	while ((str != NULL) && (*str != '\0')) {
117		if (strncmp(str, "s3_bios", 7) == 0)
118			acpi_realmode_flags |= 1;
119		if (strncmp(str, "s3_mode", 7) == 0)
120			acpi_realmode_flags |= 2;
121		if (strncmp(str, "s3_beep", 7) == 0)
122			acpi_realmode_flags |= 4;
123#ifdef CONFIG_HIBERNATION
124		if (strncmp(str, "s4_nohwsig", 10) == 0)
125			acpi_no_s4_hw_signature();
126#endif
127		if (strncmp(str, "nonvs", 5) == 0)
128			acpi_nvs_nosave();
129		if (strncmp(str, "nonvs_s3", 8) == 0)
130			acpi_nvs_nosave_s3();
131		if (strncmp(str, "old_ordering", 12) == 0)
132			acpi_old_suspend_ordering();
133		str = strchr(str, ',');
134		if (str != NULL)
135			str += strspn(str, ", \t");
136	}
137	return 1;
138}
139
140__setup("acpi_sleep=", acpi_sleep_setup);
141