x86: unify and correct the GDT_ENTRY() macro
[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
14 #include "realmode/wakeup.h"
15 #include "sleep.h"
16
17 unsigned long acpi_wakeup_address;
18 unsigned long acpi_realmode_flags;
19
20 /* address in low memory of the wakeup routine. */
21 static unsigned long acpi_realmode;
22
23 #ifdef CONFIG_64BIT
24 static char temp_stack[10240];
25 #endif
26
27 /**
28  * acpi_save_state_mem - save kernel state
29  *
30  * Create an identity mapped page table and copy the wakeup routine to
31  * low memory.
32  *
33  * Note that this is too late to change acpi_wakeup_address.
34  */
35 int acpi_save_state_mem(void)
36 {
37         struct wakeup_header *header;
38
39         if (!acpi_realmode) {
40                 printk(KERN_ERR "Could not allocate memory during boot, "
41                        "S3 disabled\n");
42                 return -ENOMEM;
43         }
44         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
45
46         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
47         if (header->signature != 0x51ee1111) {
48                 printk(KERN_ERR "wakeup header does not match\n");
49                 return -EINVAL;
50         }
51
52         header->video_mode = saved_video_mode;
53
54         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
55
56         /*
57          * Set up the wakeup GDT.  We set these up as Big Real Mode,
58          * that is, with limits set to 4 GB.  At least the Lenovo
59          * Thinkpad X61 is known to need this for the video BIOS
60          * initialization quirk to work; this is likely to also
61          * be the case for other laptops or integrated video devices.
62          */
63
64         /* GDT[0]: GDT self-pointer */
65         header->wakeup_gdt[0] =
66                 (u64)(sizeof(header->wakeup_gdt) - 1) +
67                 ((u64)(acpi_wakeup_address +
68                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
69                                 << 16);
70         /* GDT[1]: big real mode-like code segment */
71         header->wakeup_gdt[1] =
72                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
73         /* GDT[2]: big real mode-like data segment */
74         header->wakeup_gdt[2] =
75                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
76
77 #ifndef CONFIG_64BIT
78         store_gdt((struct desc_ptr *)&header->pmode_gdt);
79
80         header->pmode_efer_low = nx_enabled;
81         if (header->pmode_efer_low & 1) {
82                 /* This is strange, why not save efer, always? */
83                 rdmsr(MSR_EFER, header->pmode_efer_low,
84                         header->pmode_efer_high);
85         }
86 #endif /* !CONFIG_64BIT */
87
88         header->pmode_cr0 = read_cr0();
89         header->pmode_cr4 = read_cr4();
90         header->realmode_flags = acpi_realmode_flags;
91         header->real_magic = 0x12345678;
92
93 #ifndef CONFIG_64BIT
94         header->pmode_entry = (u32)&wakeup_pmode_return;
95         header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
96         saved_magic = 0x12345678;
97 #else /* CONFIG_64BIT */
98         header->trampoline_segment = setup_trampoline() >> 4;
99 #ifdef CONFIG_SMP
100         stack_start.sp = temp_stack + 4096;
101 #endif
102         initial_code = (unsigned long)wakeup_long64;
103         saved_magic = 0x123456789abcdef0;
104 #endif /* CONFIG_64BIT */
105
106         return 0;
107 }
108
109 /*
110  * acpi_restore_state - undo effects of acpi_save_state_mem
111  */
112 void acpi_restore_state_mem(void)
113 {
114 }
115
116
117 /**
118  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
119  *
120  * We allocate a page from the first 1MB of memory for the wakeup
121  * routine for when we come back from a sleep state. The
122  * runtime allocator allows specification of <16MB pages, but not
123  * <1MB pages.
124  */
125 void __init acpi_reserve_bootmem(void)
126 {
127         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
128                 printk(KERN_ERR
129                        "ACPI: Wakeup code way too big, S3 disabled.\n");
130                 return;
131         }
132
133         acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
134
135         if (!acpi_realmode) {
136                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
137                 return;
138         }
139
140         acpi_wakeup_address = virt_to_phys((void *)acpi_realmode);
141 }
142
143
144 static int __init acpi_sleep_setup(char *str)
145 {
146         while ((str != NULL) && (*str != '\0')) {
147                 if (strncmp(str, "s3_bios", 7) == 0)
148                         acpi_realmode_flags |= 1;
149                 if (strncmp(str, "s3_mode", 7) == 0)
150                         acpi_realmode_flags |= 2;
151                 if (strncmp(str, "s3_beep", 7) == 0)
152                         acpi_realmode_flags |= 4;
153                 if (strncmp(str, "old_ordering", 12) == 0)
154                         acpi_old_suspend_ordering();
155                 str = strchr(str, ',');
156                 if (str != NULL)
157                         str += strspn(str, ", \t");
158         }
159         return 1;
160 }
161
162 __setup("acpi_sleep=", acpi_sleep_setup);