x86, suspend: Restore MISC_ENABLE MSR in realmode wakeup
[linux-2.6.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@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  */
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->pmode_behavior = 0;
81         if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
82                         &header->pmode_misc_en_low,
83                         &header->pmode_misc_en_high))
84                 header->pmode_behavior |=
85                         (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
86         header->realmode_flags = acpi_realmode_flags;
87         header->real_magic = 0x12345678;
88
89 #ifndef CONFIG_64BIT
90         header->pmode_entry = (u32)&wakeup_pmode_return;
91         header->pmode_cr3 = (u32)__pa(&initial_page_table);
92         saved_magic = 0x12345678;
93 #else /* CONFIG_64BIT */
94         header->trampoline_segment = trampoline_address() >> 4;
95 #ifdef CONFIG_SMP
96         stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
97         early_gdt_descr.address =
98                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
99         initial_gs = per_cpu_offset(smp_processor_id());
100 #endif
101         initial_code = (unsigned long)wakeup_long64;
102        saved_magic = 0x123456789abcdef0L;
103 #endif /* CONFIG_64BIT */
104
105         do_suspend_lowlevel();
106         return 0;
107 }
108
109 static int __init acpi_sleep_setup(char *str)
110 {
111         while ((str != NULL) && (*str != '\0')) {
112                 if (strncmp(str, "s3_bios", 7) == 0)
113                         acpi_realmode_flags |= 1;
114                 if (strncmp(str, "s3_mode", 7) == 0)
115                         acpi_realmode_flags |= 2;
116                 if (strncmp(str, "s3_beep", 7) == 0)
117                         acpi_realmode_flags |= 4;
118 #ifdef CONFIG_HIBERNATION
119                 if (strncmp(str, "s4_nohwsig", 10) == 0)
120                         acpi_no_s4_hw_signature();
121 #endif
122                 if (strncmp(str, "nonvs", 5) == 0)
123                         acpi_nvs_nosave();
124                 if (strncmp(str, "old_ordering", 12) == 0)
125                         acpi_old_suspend_ordering();
126                 str = strchr(str, ',');
127                 if (str != NULL)
128                         str += strspn(str, ", \t");
129         }
130         return 1;
131 }
132
133 __setup("acpi_sleep=", acpi_sleep_setup);