2 * sleep.c - x86-specific ACPI sleep support.
4 * Copyright (C) 2001-2003 Patrick Mochel
5 * Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz>
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>
16 #include "realmode/wakeup.h"
19 unsigned long acpi_wakeup_address
;
20 unsigned long acpi_realmode_flags
;
22 /* address in low memory of the wakeup routine. */
23 static unsigned long acpi_realmode
;
25 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
26 static char temp_stack
[4096];
30 * acpi_save_state_mem - save kernel state
32 * Create an identity mapped page table and copy the wakeup routine to
35 * Note that this is too late to change acpi_wakeup_address.
37 int acpi_save_state_mem(void)
39 struct wakeup_header
*header
;
42 printk(KERN_ERR
"Could not allocate memory during boot, "
46 memcpy((void *)acpi_realmode
, &wakeup_code_start
, WAKEUP_SIZE
);
48 header
= (struct wakeup_header
*)(acpi_realmode
+ HEADER_OFFSET
);
49 if (header
->signature
!= 0x51ee1111) {
50 printk(KERN_ERR
"wakeup header does not match\n");
54 header
->video_mode
= saved_video_mode
;
56 header
->wakeup_jmp_seg
= acpi_wakeup_address
>> 4;
59 * Set up the wakeup GDT. We set these up as Big Real Mode,
60 * that is, with limits set to 4 GB. At least the Lenovo
61 * Thinkpad X61 is known to need this for the video BIOS
62 * initialization quirk to work; this is likely to also
63 * be the case for other laptops or integrated video devices.
66 /* GDT[0]: GDT self-pointer */
67 header
->wakeup_gdt
[0] =
68 (u64
)(sizeof(header
->wakeup_gdt
) - 1) +
69 ((u64
)(acpi_wakeup_address
+
70 ((char *)&header
->wakeup_gdt
- (char *)acpi_realmode
))
72 /* GDT[1]: big real mode-like code segment */
73 header
->wakeup_gdt
[1] =
74 GDT_ENTRY(0x809b, acpi_wakeup_address
, 0xfffff);
75 /* GDT[2]: big real mode-like data segment */
76 header
->wakeup_gdt
[2] =
77 GDT_ENTRY(0x8093, acpi_wakeup_address
, 0xfffff);
80 store_gdt((struct desc_ptr
*)&header
->pmode_gdt
);
82 if (rdmsr_safe(MSR_EFER
, &header
->pmode_efer_low
,
83 &header
->pmode_efer_high
))
84 header
->pmode_efer_low
= header
->pmode_efer_high
= 0;
85 #endif /* !CONFIG_64BIT */
87 header
->pmode_cr0
= read_cr0();
88 header
->pmode_cr4
= read_cr4_safe();
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;
99 stack_start
.sp
= temp_stack
+ sizeof(temp_stack
);
100 early_gdt_descr
.address
=
101 (unsigned long)get_cpu_gdt_table(smp_processor_id());
102 initial_gs
= per_cpu_offset(smp_processor_id());
104 initial_code
= (unsigned long)wakeup_long64
;
105 saved_magic
= 0x123456789abcdef0L
;
106 #endif /* CONFIG_64BIT */
112 * acpi_restore_state - undo effects of acpi_save_state_mem
114 void acpi_restore_state_mem(void)
120 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
122 * We allocate a page from the first 1MB of memory for the wakeup
123 * routine for when we come back from a sleep state. The
124 * runtime allocator allows specification of <16MB pages, but not
127 void __init
acpi_reserve_wakeup_memory(void)
131 if ((&wakeup_code_end
- &wakeup_code_start
) > WAKEUP_SIZE
) {
133 "ACPI: Wakeup code way too big, S3 disabled.\n");
137 mem
= memblock_find_in_range(0, 1<<20, WAKEUP_SIZE
, PAGE_SIZE
);
139 if (mem
== MEMBLOCK_ERROR
) {
140 printk(KERN_ERR
"ACPI: Cannot allocate lowmem, S3 disabled.\n");
143 acpi_realmode
= (unsigned long) phys_to_virt(mem
);
144 acpi_wakeup_address
= mem
;
145 memblock_x86_reserve_range(mem
, mem
+ WAKEUP_SIZE
, "ACPI WAKEUP");
149 static int __init
acpi_sleep_setup(char *str
)
151 while ((str
!= NULL
) && (*str
!= '\0')) {
152 if (strncmp(str
, "s3_bios", 7) == 0)
153 acpi_realmode_flags
|= 1;
154 if (strncmp(str
, "s3_mode", 7) == 0)
155 acpi_realmode_flags
|= 2;
156 if (strncmp(str
, "s3_beep", 7) == 0)
157 acpi_realmode_flags
|= 4;
158 #ifdef CONFIG_HIBERNATION
159 if (strncmp(str
, "s4_nohwsig", 10) == 0)
160 acpi_no_s4_hw_signature();
161 if (strncmp(str
, "s4_nonvs", 8) == 0) {
162 pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
163 "please use acpi_sleep=nonvs instead");
167 if (strncmp(str
, "nonvs", 5) == 0)
169 if (strncmp(str
, "old_ordering", 12) == 0)
170 acpi_old_suspend_ordering();
171 str
= strchr(str
, ',');
173 str
+= strspn(str
, ", \t");
178 __setup("acpi_sleep=", acpi_sleep_setup
);
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