x86: unify arch/x86/kernel/acpi/sleep*.c
[linux-3.10.git] / arch / x86 / kernel / acpi / sleep.c
1 /*
2  * sleep.c - x86-specific ACPI sleep support.
3  *
4  *  Copyright (C) 2001-2003 Patrick Mochel
5  *  Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
6  */
7
8 #include <linux/acpi.h>
9 #include <linux/bootmem.h>
10 #include <linux/dmi.h>
11 #include <linux/cpumask.h>
12
13 #include <asm/smp.h>
14
15 /* address in low memory of the wakeup routine. */
16 unsigned long acpi_wakeup_address = 0;
17 unsigned long acpi_realmode_flags;
18 extern char wakeup_start, wakeup_end;
19
20 extern unsigned long acpi_copy_wakeup_routine(unsigned long);
21
22 /**
23  * acpi_save_state_mem - save kernel state
24  *
25  * Create an identity mapped page table and copy the wakeup routine to
26  * low memory.
27  */
28 int acpi_save_state_mem(void)
29 {
30         if (!acpi_wakeup_address) {
31                 printk(KERN_ERR "Could not allocate memory during boot, S3 disabled\n");
32                 return -ENOMEM;
33         }
34         memcpy((void *)acpi_wakeup_address, &wakeup_start,
35                &wakeup_end - &wakeup_start);
36         acpi_copy_wakeup_routine(acpi_wakeup_address);
37
38         return 0;
39 }
40
41 /*
42  * acpi_restore_state - undo effects of acpi_save_state_mem
43  */
44 void acpi_restore_state_mem(void)
45 {
46 }
47
48
49 /**
50  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
51  *
52  * We allocate a page from the first 1MB of memory for the wakeup
53  * routine for when we come back from a sleep state. The
54  * runtime allocator allows specification of <16MB pages, but not
55  * <1MB pages.
56  */
57 void __init acpi_reserve_bootmem(void)
58 {
59         if ((&wakeup_end - &wakeup_start) > PAGE_SIZE*2) {
60                 printk(KERN_ERR
61                        "ACPI: Wakeup code way too big, S3 disabled.\n");
62                 return;
63         }
64
65         acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
66         if (!acpi_wakeup_address)
67                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
68 }
69
70
71 static int __init acpi_sleep_setup(char *str)
72 {
73         while ((str != NULL) && (*str != '\0')) {
74                 if (strncmp(str, "s3_bios", 7) == 0)
75                         acpi_realmode_flags |= 1;
76                 if (strncmp(str, "s3_mode", 7) == 0)
77                         acpi_realmode_flags |= 2;
78                 if (strncmp(str, "s3_beep", 7) == 0)
79                         acpi_realmode_flags |= 4;
80                 str = strchr(str, ',');
81                 if (str != NULL)
82                         str += strspn(str, ", \t");
83         }
84         return 1;
85 }
86
87 __setup("acpi_sleep=", acpi_sleep_setup);