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
18 #include "realmode/wakeup.h"
19 #include "sleep.h"
20
21 unsigned long acpi_realmode_flags;
22
23 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
24 static char temp_stack[4096];
25 #endif
26
27 /**
28 * acpi_suspend_lowlevel - save kernel state
29 *
30 * Create an identity mapped page table and copy the wakeup routine to
31 * low memory.
32 */
acpi_suspend_lowlevel(void)33 int acpi_suspend_lowlevel(void)
34 {
35 struct wakeup_header *header;
36 /* address in low memory of the wakeup routine. */
37 char *acpi_realmode;
38
39 acpi_realmode = TRAMPOLINE_SYM(acpi_wakeup_code);
40
41 header = (struct wakeup_header *)(acpi_realmode + WAKEUP_HEADER_OFFSET);
42 if (header->signature != WAKEUP_HEADER_SIGNATURE) {
43 printk(KERN_ERR "wakeup header does not match\n");
44 return -EINVAL;
45 }
46
47 header->video_mode = saved_video_mode;
48
49 header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
50
51 /*
52 * Set up the wakeup GDT. We set these up as Big Real Mode,
53 * that is, with limits set to 4 GB. At least the Lenovo
54 * Thinkpad X61 is known to need this for the video BIOS
55 * initialization quirk to work; this is likely to also
56 * be the case for other laptops or integrated video devices.
57 */
58
59 /* GDT[0]: GDT self-pointer */
60 header->wakeup_gdt[0] =
61 (u64)(sizeof(header->wakeup_gdt) - 1) +
62 ((u64)__pa(&header->wakeup_gdt) << 16);
63 /* GDT[1]: big real mode-like code segment */
64 header->wakeup_gdt[1] =
65 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
66 /* GDT[2]: big real mode-like data segment */
67 header->wakeup_gdt[2] =
68 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
69
70 #ifndef CONFIG_64BIT
71 store_gdt((struct desc_ptr *)&header->pmode_gdt);
72
73 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
74 &header->pmode_efer_high))
75 header->pmode_efer_low = header->pmode_efer_high = 0;
76 #endif /* !CONFIG_64BIT */
77
78 header->pmode_cr0 = read_cr0();
79 header->pmode_cr4 = read_cr4_safe();
80 header->realmode_flags = acpi_realmode_flags;
81 header->real_magic = 0x12345678;
82
83 #ifndef CONFIG_64BIT
84 header->pmode_entry = (u32)&wakeup_pmode_return;
85 header->pmode_cr3 = (u32)__pa(&initial_page_table);
86 saved_magic = 0x12345678;
87 #else /* CONFIG_64BIT */
88 header->trampoline_segment = trampoline_address() >> 4;
89 #ifdef CONFIG_SMP
90 stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
91 early_gdt_descr.address =
92 (unsigned long)get_cpu_gdt_table(smp_processor_id());
93 initial_gs = per_cpu_offset(smp_processor_id());
94 #endif
95 initial_code = (unsigned long)wakeup_long64;
96 saved_magic = 0x123456789abcdef0L;
97 #endif /* CONFIG_64BIT */
98
99 do_suspend_lowlevel();
100 return 0;
101 }
102
acpi_sleep_setup(char * str)103 static int __init acpi_sleep_setup(char *str)
104 {
105 while ((str != NULL) && (*str != '\0')) {
106 if (strncmp(str, "s3_bios", 7) == 0)
107 acpi_realmode_flags |= 1;
108 if (strncmp(str, "s3_mode", 7) == 0)
109 acpi_realmode_flags |= 2;
110 if (strncmp(str, "s3_beep", 7) == 0)
111 acpi_realmode_flags |= 4;
112 #ifdef CONFIG_HIBERNATION
113 if (strncmp(str, "s4_nohwsig", 10) == 0)
114 acpi_no_s4_hw_signature();
115 if (strncmp(str, "s4_nonvs", 8) == 0) {
116 pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
117 "please use acpi_sleep=nonvs instead");
118 acpi_nvs_nosave();
119 }
120 #endif
121 if (strncmp(str, "nonvs", 5) == 0)
122 acpi_nvs_nosave();
123 if (strncmp(str, "old_ordering", 12) == 0)
124 acpi_old_suspend_ordering();
125 str = strchr(str, ',');
126 if (str != NULL)
127 str += strspn(str, ", \t");
128 }
129 return 1;
130 }
131
132 __setup("acpi_sleep=", acpi_sleep_setup);
133