]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/x86/kernel/acpi/sleep.c
2 * sleep.c - x86-specific ACPI sleep support.
4 * Copyright (C) 2001-2003 Patrick Mochel
5 * Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
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>
14 #include "realmode/wakeup.h"
17 unsigned long acpi_wakeup_address
;
18 unsigned long acpi_realmode_flags
;
20 /* address in low memory of the wakeup routine. */
21 static unsigned long acpi_realmode
;
23 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
24 static char temp_stack
[10240];
28 * acpi_save_state_mem - save kernel state
30 * Create an identity mapped page table and copy the wakeup routine to
33 * Note that this is too late to change acpi_wakeup_address.
35 int acpi_save_state_mem(void)
37 struct wakeup_header
*header
;
40 printk(KERN_ERR
"Could not allocate memory during boot, "
44 memcpy((void *)acpi_realmode
, &wakeup_code_start
, WAKEUP_SIZE
);
46 header
= (struct wakeup_header
*)(acpi_realmode
+ HEADER_OFFSET
);
47 if (header
->signature
!= 0x51ee1111) {
48 printk(KERN_ERR
"wakeup header does not match\n");
52 header
->video_mode
= saved_video_mode
;
54 header
->wakeup_jmp_seg
= acpi_wakeup_address
>> 4;
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.
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
))
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);
78 store_gdt((struct desc_ptr
*)&header
->pmode_gdt
);
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
);
86 #endif /* !CONFIG_64BIT */
88 header
->pmode_cr0
= read_cr0();
89 header
->pmode_cr4
= read_cr4_safe();
90 header
->realmode_flags
= acpi_realmode_flags
;
91 header
->real_magic
= 0x12345678;
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;
100 stack_start
.sp
= temp_stack
+ 4096;
102 initial_code
= (unsigned long)wakeup_long64
;
103 saved_magic
= 0x123456789abcdef0;
104 #endif /* CONFIG_64BIT */
110 * acpi_restore_state - undo effects of acpi_save_state_mem
112 void acpi_restore_state_mem(void)
118 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
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
125 void __init
acpi_reserve_bootmem(void)
127 if ((&wakeup_code_end
- &wakeup_code_start
) > WAKEUP_SIZE
) {
129 "ACPI: Wakeup code way too big, S3 disabled.\n");
133 acpi_realmode
= (unsigned long)alloc_bootmem_low(WAKEUP_SIZE
);
135 if (!acpi_realmode
) {
136 printk(KERN_ERR
"ACPI: Cannot allocate lowmem, S3 disabled.\n");
140 acpi_wakeup_address
= virt_to_phys((void *)acpi_realmode
);
144 static int __init
acpi_sleep_setup(char *str
)
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 #ifdef CONFIG_HIBERNATION
154 if (strncmp(str
, "s4_nohwsig", 10) == 0)
155 acpi_no_s4_hw_signature();
157 if (strncmp(str
, "old_ordering", 12) == 0)
158 acpi_old_suspend_ordering();
159 str
= strchr(str
, ',');
161 str
+= strspn(str
, ", \t");
166 __setup("acpi_sleep=", acpi_sleep_setup
);