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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/x86/kernel/acpi/sleep.c
130711f1454b9ee5a179cf201abbf17b8d54d439
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>
13 #include "realmode/wakeup.h"
16 unsigned long acpi_wakeup_address
;
17 unsigned long acpi_realmode_flags
;
19 /* address in low memory of the wakeup routine. */
20 static unsigned long acpi_realmode
;
23 static char temp_stack
[10240];
26 /* XXX: this macro should move to asm-x86/segment.h and be shared with the
28 #define GDT_ENTRY(flags, base, limit) \
29 (((u64)(base & 0xff000000) << 32) | \
30 ((u64)flags << 40) | \
31 ((u64)(limit & 0x00ff0000) << 32) | \
32 ((u64)(base & 0x00ffffff) << 16) | \
33 ((u64)(limit & 0x0000ffff)))
36 * acpi_save_state_mem - save kernel state
38 * Create an identity mapped page table and copy the wakeup routine to
41 * Note that this is too late to change acpi_wakeup_address.
43 int acpi_save_state_mem(void)
45 struct wakeup_header
*header
;
48 printk(KERN_ERR
"Could not allocate memory during boot, "
52 memcpy((void *)acpi_realmode
, &wakeup_code_start
, WAKEUP_SIZE
);
54 header
= (struct wakeup_header
*)(acpi_realmode
+ HEADER_OFFSET
);
55 if (header
->signature
!= 0x51ee1111) {
56 printk(KERN_ERR
"wakeup header does not match\n");
60 header
->video_mode
= saved_video_mode
;
62 header
->wakeup_jmp_seg
= acpi_wakeup_address
>> 4;
63 /* GDT[0]: GDT self-pointer */
64 header
->wakeup_gdt
[0] =
65 (u64
)(sizeof(header
->wakeup_gdt
) - 1) +
66 ((u64
)(acpi_wakeup_address
+
67 ((char *)&header
->wakeup_gdt
- (char *)acpi_realmode
))
69 /* GDT[1]: real-mode-like code segment */
70 header
->wakeup_gdt
[1] =
71 GDT_ENTRY(0x809b, acpi_wakeup_address
, 0xfffff);
72 /* GDT[2]: real-mode-like data segment */
73 header
->wakeup_gdt
[2] =
74 GDT_ENTRY(0x8093, acpi_wakeup_address
, 0xfffff);
77 store_gdt((struct desc_ptr
*)&header
->pmode_gdt
);
79 header
->pmode_efer_low
= nx_enabled
;
80 if (header
->pmode_efer_low
& 1) {
81 /* This is strange, why not save efer, always? */
82 rdmsr(MSR_EFER
, header
->pmode_efer_low
,
83 header
->pmode_efer_high
);
85 #endif /* !CONFIG_64BIT */
87 header
->pmode_cr0
= read_cr0();
88 header
->pmode_cr4
= read_cr4();
89 header
->realmode_flags
= acpi_realmode_flags
;
90 header
->real_magic
= 0x12345678;
93 header
->pmode_entry
= (u32
)&wakeup_pmode_return
;
94 header
->pmode_cr3
= (u32
)(swsusp_pg_dir
- __PAGE_OFFSET
);
95 saved_magic
= 0x12345678;
96 #else /* CONFIG_64BIT */
97 header
->trampoline_segment
= setup_trampoline() >> 4;
98 init_rsp
= (unsigned long)temp_stack
+ 4096;
99 initial_code
= (unsigned long)wakeup_long64
;
100 saved_magic
= 0x123456789abcdef0;
101 #endif /* CONFIG_64BIT */
107 * acpi_restore_state - undo effects of acpi_save_state_mem
109 void acpi_restore_state_mem(void)
115 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
117 * We allocate a page from the first 1MB of memory for the wakeup
118 * routine for when we come back from a sleep state. The
119 * runtime allocator allows specification of <16MB pages, but not
122 void __init
acpi_reserve_bootmem(void)
124 if ((&wakeup_code_end
- &wakeup_code_start
) > WAKEUP_SIZE
) {
126 "ACPI: Wakeup code way too big, S3 disabled.\n");
130 acpi_realmode
= (unsigned long)alloc_bootmem_low(WAKEUP_SIZE
);
132 if (!acpi_realmode
) {
133 printk(KERN_ERR
"ACPI: Cannot allocate lowmem, S3 disabled.\n");
137 acpi_wakeup_address
= virt_to_phys((void *)acpi_realmode
);
141 static int __init
acpi_sleep_setup(char *str
)
143 while ((str
!= NULL
) && (*str
!= '\0')) {
144 if (strncmp(str
, "s3_bios", 7) == 0)
145 acpi_realmode_flags
|= 1;
146 if (strncmp(str
, "s3_mode", 7) == 0)
147 acpi_realmode_flags
|= 2;
148 if (strncmp(str
, "s3_beep", 7) == 0)
149 acpi_realmode_flags
|= 4;
150 str
= strchr(str
, ',');
152 str
+= strspn(str
, ", \t");
157 __setup("acpi_sleep=", acpi_sleep_setup
);