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];
27 * acpi_save_state_mem - save kernel state
29 * Create an identity mapped page table and copy the wakeup routine to
32 * Note that this is too late to change acpi_wakeup_address.
34 int acpi_save_state_mem(void)
36 struct wakeup_header
*header
;
39 printk(KERN_ERR
"Could not allocate memory during boot, "
43 memcpy((void *)acpi_realmode
, &wakeup_code_start
, WAKEUP_SIZE
);
45 header
= (struct wakeup_header
*)(acpi_realmode
+ HEADER_OFFSET
);
46 if (header
->signature
!= 0x51ee1111) {
47 printk(KERN_ERR
"wakeup header does not match\n");
51 header
->video_mode
= saved_video_mode
;
53 header
->wakeup_jmp_seg
= acpi_wakeup_address
>> 4;
54 /* GDT[0]: GDT self-pointer */
55 header
->wakeup_gdt
[0] =
56 (u64
)(sizeof(header
->wakeup_gdt
) - 1) +
57 ((u64
)(acpi_wakeup_address
+
58 ((char *)&header
->wakeup_gdt
- (char *)acpi_realmode
))
60 /* GDT[1]: real-mode-like code segment */
61 header
->wakeup_gdt
[1] = (0x009bULL
<< 40) +
62 ((u64
)acpi_wakeup_address
<< 16) + 0xffff;
63 /* GDT[2]: real-mode-like data segment */
64 header
->wakeup_gdt
[2] = (0x0093ULL
<< 40) +
65 ((u64
)acpi_wakeup_address
<< 16) + 0xffff;
68 store_gdt((struct desc_ptr
*)&header
->pmode_gdt
);
70 header
->pmode_efer_low
= nx_enabled
;
71 if (header
->pmode_efer_low
& 1) {
72 /* This is strange, why not save efer, always? */
73 rdmsr(MSR_EFER
, header
->pmode_efer_low
,
74 header
->pmode_efer_high
);
76 #endif /* !CONFIG_64BIT */
78 header
->pmode_cr0
= read_cr0();
79 header
->pmode_cr4
= read_cr4();
80 header
->realmode_flags
= acpi_realmode_flags
;
81 header
->real_magic
= 0x12345678;
84 header
->pmode_entry
= (u32
)&wakeup_pmode_return
;
85 header
->pmode_cr3
= (u32
)(swsusp_pg_dir
- __PAGE_OFFSET
);
86 saved_magic
= 0x12345678;
87 #else /* CONFIG_64BIT */
88 header
->trampoline_segment
= setup_trampoline() >> 4;
90 stack_start
.sp
= temp_stack
+ 4096;
92 initial_code
= (unsigned long)wakeup_long64
;
93 saved_magic
= 0x123456789abcdef0;
94 #endif /* CONFIG_64BIT */
100 * acpi_restore_state - undo effects of acpi_save_state_mem
102 void acpi_restore_state_mem(void)
108 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
110 * We allocate a page from the first 1MB of memory for the wakeup
111 * routine for when we come back from a sleep state. The
112 * runtime allocator allows specification of <16MB pages, but not
115 void __init
acpi_reserve_bootmem(void)
117 if ((&wakeup_code_end
- &wakeup_code_start
) > WAKEUP_SIZE
) {
119 "ACPI: Wakeup code way too big, S3 disabled.\n");
123 acpi_realmode
= (unsigned long)alloc_bootmem_low(WAKEUP_SIZE
);
125 if (!acpi_realmode
) {
126 printk(KERN_ERR
"ACPI: Cannot allocate lowmem, S3 disabled.\n");
130 acpi_wakeup_address
= virt_to_phys((void *)acpi_realmode
);
134 static int __init
acpi_sleep_setup(char *str
)
136 while ((str
!= NULL
) && (*str
!= '\0')) {
137 if (strncmp(str
, "s3_bios", 7) == 0)
138 acpi_realmode_flags
|= 1;
139 if (strncmp(str
, "s3_mode", 7) == 0)
140 acpi_realmode_flags
|= 2;
141 if (strncmp(str
, "s3_beep", 7) == 0)
142 acpi_realmode_flags
|= 4;
143 str
= strchr(str
, ',');
145 str
+= strspn(str
, ", \t");
150 __setup("acpi_sleep=", acpi_sleep_setup
);