Merge commit 'remotes/tip/x86/paravirt' into x86/untangle2
[linux-3.10.git] / arch / x86 / kernel / acpi / sleep.c
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@suse.cz>
6  */
7
8 #include <linux/acpi.h>
9 #include <linux/bootmem.h>
10 #include <linux/dmi.h>
11 #include <linux/cpumask.h>
12 #include <asm/segment.h>
13 #include <asm/desc.h>
14
15 #include "realmode/wakeup.h"
16 #include "sleep.h"
17
18 unsigned long acpi_wakeup_address;
19 unsigned long acpi_realmode_flags;
20
21 /* address in low memory of the wakeup routine. */
22 static unsigned long acpi_realmode;
23
24 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
25 static char temp_stack[4096];
26 #endif
27
28 /**
29  * acpi_save_state_mem - save kernel state
30  *
31  * Create an identity mapped page table and copy the wakeup routine to
32  * low memory.
33  *
34  * Note that this is too late to change acpi_wakeup_address.
35  */
36 int acpi_save_state_mem(void)
37 {
38         struct wakeup_header *header;
39
40         if (!acpi_realmode) {
41                 printk(KERN_ERR "Could not allocate memory during boot, "
42                        "S3 disabled\n");
43                 return -ENOMEM;
44         }
45         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
46
47         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
48         if (header->signature != 0x51ee1111) {
49                 printk(KERN_ERR "wakeup header does not match\n");
50                 return -EINVAL;
51         }
52
53         header->video_mode = saved_video_mode;
54
55         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
56
57         /*
58          * Set up the wakeup GDT.  We set these up as Big Real Mode,
59          * that is, with limits set to 4 GB.  At least the Lenovo
60          * Thinkpad X61 is known to need this for the video BIOS
61          * initialization quirk to work; this is likely to also
62          * be the case for other laptops or integrated video devices.
63          */
64
65         /* GDT[0]: GDT self-pointer */
66         header->wakeup_gdt[0] =
67                 (u64)(sizeof(header->wakeup_gdt) - 1) +
68                 ((u64)(acpi_wakeup_address +
69                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
70                                 << 16);
71         /* GDT[1]: big real mode-like code segment */
72         header->wakeup_gdt[1] =
73                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
74         /* GDT[2]: big real mode-like data segment */
75         header->wakeup_gdt[2] =
76                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
77
78 #ifndef CONFIG_64BIT
79         store_gdt((struct desc_ptr *)&header->pmode_gdt);
80
81         header->pmode_efer_low = nx_enabled;
82         if (header->pmode_efer_low & 1) {
83                 /* This is strange, why not save efer, always? */
84                 rdmsr(MSR_EFER, header->pmode_efer_low,
85                         header->pmode_efer_high);
86         }
87 #endif /* !CONFIG_64BIT */
88
89         header->pmode_cr0 = read_cr0();
90         header->pmode_cr4 = read_cr4_safe();
91         header->realmode_flags = acpi_realmode_flags;
92         header->real_magic = 0x12345678;
93
94 #ifndef CONFIG_64BIT
95         header->pmode_entry = (u32)&wakeup_pmode_return;
96         header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
97         saved_magic = 0x12345678;
98 #else /* CONFIG_64BIT */
99         header->trampoline_segment = setup_trampoline() >> 4;
100 #ifdef CONFIG_SMP
101         stack_start.sp = 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 = 0x123456789abcdef0;
108 #endif /* CONFIG_64BIT */
109
110         return 0;
111 }
112
113 /*
114  * acpi_restore_state - undo effects of acpi_save_state_mem
115  */
116 void acpi_restore_state_mem(void)
117 {
118 }
119
120
121 /**
122  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
123  *
124  * We allocate a page from the first 1MB of memory for the wakeup
125  * routine for when we come back from a sleep state. The
126  * runtime allocator allows specification of <16MB pages, but not
127  * <1MB pages.
128  */
129 void __init acpi_reserve_bootmem(void)
130 {
131         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
132                 printk(KERN_ERR
133                        "ACPI: Wakeup code way too big, S3 disabled.\n");
134                 return;
135         }
136
137         acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
138
139         if (!acpi_realmode) {
140                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
141                 return;
142         }
143
144         acpi_wakeup_address = virt_to_phys((void *)acpi_realmode);
145 }
146
147
148 static int __init acpi_sleep_setup(char *str)
149 {
150         while ((str != NULL) && (*str != '\0')) {
151                 if (strncmp(str, "s3_bios", 7) == 0)
152                         acpi_realmode_flags |= 1;
153                 if (strncmp(str, "s3_mode", 7) == 0)
154                         acpi_realmode_flags |= 2;
155                 if (strncmp(str, "s3_beep", 7) == 0)
156                         acpi_realmode_flags |= 4;
157 #ifdef CONFIG_HIBERNATION
158                 if (strncmp(str, "s4_nohwsig", 10) == 0)
159                         acpi_no_s4_hw_signature();
160                 if (strncmp(str, "s4_nonvs", 8) == 0)
161                         acpi_s4_no_nvs();
162 #endif
163                 if (strncmp(str, "old_ordering", 12) == 0)
164                         acpi_old_suspend_ordering();
165                 str = strchr(str, ',');
166                 if (str != NULL)
167                         str += strspn(str, ", \t");
168         }
169         return 1;
170 }
171
172 __setup("acpi_sleep=", acpi_sleep_setup);