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
22 unsigned long acpi_realmode_flags;
23
24 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
25 static char temp_stack[4096];
26 #endif
27
28 /**
29 * acpi_suspend_lowlevel - save kernel state
30 *
31 * Create an identity mapped page table and copy the wakeup routine to
32 * low memory.
33 */
acpi_suspend_lowlevel(void)34 int acpi_suspend_lowlevel(void)
35 {
36 struct wakeup_header *header =
37 (struct wakeup_header *) __va(real_mode_header->wakeup_header);
38
39 if (header->signature != WAKEUP_HEADER_SIGNATURE) {
40 printk(KERN_ERR "wakeup header does not match\n");
41 return -EINVAL;
42 }
43
44 header->video_mode = saved_video_mode;
45
46 header->pmode_behavior = 0;
47
48 #ifndef CONFIG_64BIT
49 native_store_gdt((struct desc_ptr *)&header->pmode_gdt);
50
51 if (!rdmsr_safe(MSR_EFER,
52 &header->pmode_efer_low,
53 &header->pmode_efer_high))
54 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER);
55 #endif /* !CONFIG_64BIT */
56
57 header->pmode_cr0 = read_cr0();
58 if (__this_cpu_read(cpu_info.cpuid_level) >= 0) {
59 header->pmode_cr4 = read_cr4();
60 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4);
61 }
62 if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
63 &header->pmode_misc_en_low,
64 &header->pmode_misc_en_high))
65 header->pmode_behavior |=
66 (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
67 header->realmode_flags = acpi_realmode_flags;
68 header->real_magic = 0x12345678;
69
70 #ifndef CONFIG_64BIT
71 header->pmode_entry = (u32)&wakeup_pmode_return;
72 header->pmode_cr3 = (u32)__pa_symbol(initial_page_table);
73 saved_magic = 0x12345678;
74 #else /* CONFIG_64BIT */
75 #ifdef CONFIG_SMP
76 stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
77 early_gdt_descr.address =
78 (unsigned long)get_cpu_gdt_table(smp_processor_id());
79 initial_gs = per_cpu_offset(smp_processor_id());
80 #endif
81 initial_code = (unsigned long)wakeup_long64;
82 saved_magic = 0x123456789abcdef0L;
83 #endif /* CONFIG_64BIT */
84
85 do_suspend_lowlevel();
86 return 0;
87 }
88
acpi_sleep_setup(char * str)89 static int __init acpi_sleep_setup(char *str)
90 {
91 while ((str != NULL) && (*str != '\0')) {
92 if (strncmp(str, "s3_bios", 7) == 0)
93 acpi_realmode_flags |= 1;
94 if (strncmp(str, "s3_mode", 7) == 0)
95 acpi_realmode_flags |= 2;
96 if (strncmp(str, "s3_beep", 7) == 0)
97 acpi_realmode_flags |= 4;
98 #ifdef CONFIG_HIBERNATION
99 if (strncmp(str, "s4_nohwsig", 10) == 0)
100 acpi_no_s4_hw_signature();
101 #endif
102 if (strncmp(str, "nonvs", 5) == 0)
103 acpi_nvs_nosave();
104 if (strncmp(str, "nonvs_s3", 8) == 0)
105 acpi_nvs_nosave_s3();
106 if (strncmp(str, "old_ordering", 12) == 0)
107 acpi_old_suspend_ordering();
108 str = strchr(str, ',');
109 if (str != NULL)
110 str += strspn(str, ", \t");
111 }
112 return 1;
113 }
114
115 __setup("acpi_sleep=", acpi_sleep_setup);
116