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. */
16unsigned long acpi_wakeup_address = 0;
17unsigned long acpi_video_flags;
18extern char wakeup_start, wakeup_end;
19
20extern unsigned long FASTCALL(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 */
28int acpi_save_state_mem(void)
29{
30	if (!acpi_wakeup_address)
31		return 1;
32	memcpy((void *)acpi_wakeup_address, &wakeup_start,
33	       &wakeup_end - &wakeup_start);
34	acpi_copy_wakeup_routine(acpi_wakeup_address);
35
36	return 0;
37}
38
39/*
40 * acpi_restore_state - undo effects of acpi_save_state_mem
41 */
42void acpi_restore_state_mem(void)
43{
44}
45
46/**
47 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
48 *
49 * We allocate a page from the first 1MB of memory for the wakeup
50 * routine for when we come back from a sleep state. The
51 * runtime allocator allows specification of <16MB pages, but not
52 * <1MB pages.
53 */
54void __init acpi_reserve_bootmem(void)
55{
56	if ((&wakeup_end - &wakeup_start) > PAGE_SIZE) {
57		printk(KERN_ERR
58		       "ACPI: Wakeup code way too big, S3 disabled.\n");
59		return;
60	}
61
62	acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
63	if (!acpi_wakeup_address)
64		printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
65}
66
67static int __init acpi_sleep_setup(char *str)
68{
69	while ((str != NULL) && (*str != '\0')) {
70		if (strncmp(str, "s3_bios", 7) == 0)
71			acpi_video_flags = 1;
72		if (strncmp(str, "s3_mode", 7) == 0)
73			acpi_video_flags |= 2;
74		str = strchr(str, ',');
75		if (str != NULL)
76			str += strspn(str, ", \t");
77	}
78	return 1;
79}
80
81__setup("acpi_sleep=", acpi_sleep_setup);
82
83static __init int reset_videomode_after_s3(struct dmi_system_id *d)
84{
85	acpi_video_flags |= 2;
86	return 0;
87}
88
89static __initdata struct dmi_system_id acpisleep_dmi_table[] = {
90	{			/* Reset video mode after returning from ACPI S3 sleep */
91	 .callback = reset_videomode_after_s3,
92	 .ident = "Toshiba Satellite 4030cdt",
93	 .matches = {
94		     DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),
95		     },
96	 },
97	{}
98};
99
100static int __init acpisleep_dmi_init(void)
101{
102	dmi_check_system(acpisleep_dmi_table);
103	return 0;
104}
105
106core_initcall(acpisleep_dmi_init);
107