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>
15 #include "realmode/wakeup.h"
18 unsigned long acpi_wakeup_address
;
19 unsigned long acpi_realmode_flags
;
21 /* address in low memory of the wakeup routine. */
22 static unsigned long acpi_realmode
;
24 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
25 static char temp_stack
[4096];
29 * acpi_save_state_mem - save kernel state
31 * Create an identity mapped page table and copy the wakeup routine to
34 * Note that this is too late to change acpi_wakeup_address.
36 int acpi_save_state_mem(void)
38 struct wakeup_header
*header
;
41 printk(KERN_ERR
"Could not allocate memory during boot, "
45 memcpy((void *)acpi_realmode
, &wakeup_code_start
, WAKEUP_SIZE
);
47 header
= (struct wakeup_header
*)(acpi_realmode
+ HEADER_OFFSET
);
48 if (header
->signature
!= 0x51ee1111) {
49 printk(KERN_ERR
"wakeup header does not match\n");
53 header
->video_mode
= saved_video_mode
;
55 header
->wakeup_jmp_seg
= acpi_wakeup_address
>> 4;
58 * Set up the wakeup GDT. We set these up as Big Real Mode,
59 * that is, with limits set to 4 GB. At least the Lenovo
60 * Thinkpad X61 is known to need this for the video BIOS
61 * initialization quirk to work; this is likely to also
62 * be the case for other laptops or integrated video devices.
65 /* GDT[0]: GDT self-pointer */
66 header
->wakeup_gdt
[0] =
67 (u64
)(sizeof(header
->wakeup_gdt
) - 1) +
68 ((u64
)(acpi_wakeup_address
+
69 ((char *)&header
->wakeup_gdt
- (char *)acpi_realmode
))
71 /* GDT[1]: big real mode-like code segment */
72 header
->wakeup_gdt
[1] =
73 GDT_ENTRY(0x809b, acpi_wakeup_address
, 0xfffff);
74 /* GDT[2]: big real mode-like data segment */
75 header
->wakeup_gdt
[2] =
76 GDT_ENTRY(0x8093, acpi_wakeup_address
, 0xfffff);
79 store_gdt((struct desc_ptr
*)&header
->pmode_gdt
);
81 if (rdmsr_safe(MSR_EFER
, &header
->pmode_efer_low
,
82 &header
->pmode_efer_high
))
83 header
->pmode_efer_low
= header
->pmode_efer_high
= 0;
84 #endif /* !CONFIG_64BIT */
86 header
->pmode_cr0
= read_cr0();
87 header
->pmode_cr4
= read_cr4_safe();
88 header
->realmode_flags
= acpi_realmode_flags
;
89 header
->real_magic
= 0x12345678;
92 header
->pmode_entry
= (u32
)&wakeup_pmode_return
;
93 header
->pmode_cr3
= (u32
)(swsusp_pg_dir
- __PAGE_OFFSET
);
94 saved_magic
= 0x12345678;
95 #else /* CONFIG_64BIT */
96 header
->trampoline_segment
= setup_trampoline() >> 4;
98 stack_start
.sp
= temp_stack
+ sizeof(temp_stack
);
99 early_gdt_descr
.address
=
100 (unsigned long)get_cpu_gdt_table(smp_processor_id());
101 initial_gs
= per_cpu_offset(smp_processor_id());
103 initial_code
= (unsigned long)wakeup_long64
;
104 saved_magic
= 0x123456789abcdef0L
;
105 #endif /* CONFIG_64BIT */
111 * acpi_restore_state - undo effects of acpi_save_state_mem
113 void acpi_restore_state_mem(void)
119 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
121 * We allocate a page from the first 1MB of memory for the wakeup
122 * routine for when we come back from a sleep state. The
123 * runtime allocator allows specification of <16MB pages, but not
126 void __init
acpi_reserve_wakeup_memory(void)
130 if ((&wakeup_code_end
- &wakeup_code_start
) > WAKEUP_SIZE
) {
132 "ACPI: Wakeup code way too big, S3 disabled.\n");
136 mem
= find_e820_area(0, 1<<20, WAKEUP_SIZE
, PAGE_SIZE
);
139 printk(KERN_ERR
"ACPI: Cannot allocate lowmem, S3 disabled.\n");
142 acpi_realmode
= (unsigned long) phys_to_virt(mem
);
143 acpi_wakeup_address
= mem
;
144 reserve_early(mem
, mem
+ WAKEUP_SIZE
, "ACPI WAKEUP");
148 static int __init
acpi_sleep_setup(char *str
)
150 while ((str
!= NULL
) && (*str
!= '\0')) {
151 if (strncmp(str
, "s3_bios", 7) == 0)
152 acpi_realmode_flags
|= 1;
153 if (strncmp(str
, "s3_mode", 7) == 0)
154 acpi_realmode_flags
|= 2;
155 if (strncmp(str
, "s3_beep", 7) == 0)
156 acpi_realmode_flags
|= 4;
157 #ifdef CONFIG_HIBERNATION
158 if (strncmp(str
, "s4_nohwsig", 10) == 0)
159 acpi_no_s4_hw_signature();
160 if (strncmp(str
, "s4_nonvs", 8) == 0)
163 if (strncmp(str
, "old_ordering", 12) == 0)
164 acpi_old_suspend_ordering();
165 if (strncmp(str
, "sci_force_enable", 16) == 0)
166 acpi_set_sci_en_on_resume();
167 str
= strchr(str
, ',');
169 str
+= strspn(str
, ", \t");
174 __setup("acpi_sleep=", acpi_sleep_setup
);