1/*
2 *  acpi.c - Architecture-Specific Low-Level ACPI Support
3 *
4 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5 *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
6 *  Copyright (C) 2001 Patrick Mochel <mochel@osdl.org>
7 *  Copyright (C) 2002 Andi Kleen, SuSE Labs (x86-64 port)
8 *  Copyright (C) 2003 Pavel Machek, SuSE Labs
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 *  This program is free software; you can redistribute it and/or modify
13 *  it under the terms of the GNU General Public License as published by
14 *  the Free Software Foundation; either version 2 of the License, or
15 *  (at your option) any later version.
16 *
17 *  This program is distributed in the hope that it will be useful,
18 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
19 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20 *  GNU General Public License for more details.
21 *
22 *  You should have received a copy of the GNU General Public License
23 *  along with this program; if not, write to the Free Software
24 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 */
28
29#include <linux/kernel.h>
30#include <linux/init.h>
31#include <linux/types.h>
32#include <linux/stddef.h>
33#include <linux/slab.h>
34#include <linux/pci.h>
35#include <linux/bootmem.h>
36#include <linux/acpi.h>
37#include <linux/cpumask.h>
38
39#include <asm/mpspec.h>
40#include <asm/io.h>
41#include <asm/apic.h>
42#include <asm/apicdef.h>
43#include <asm/page.h>
44#include <asm/pgtable.h>
45#include <asm/pgalloc.h>
46#include <asm/io_apic.h>
47#include <asm/proto.h>
48#include <asm/tlbflush.h>
49
50/* --------------------------------------------------------------------------
51                              Low-Level Sleep Support
52   -------------------------------------------------------------------------- */
53
54#ifdef CONFIG_ACPI_SLEEP
55
56/* address in low memory of the wakeup routine. */
57unsigned long acpi_wakeup_address = 0;
58unsigned long acpi_video_flags;
59extern char wakeup_start, wakeup_end;
60
61extern unsigned long acpi_copy_wakeup_routine(unsigned long);
62
63/**
64 * acpi_save_state_mem - save kernel state
65 *
66 * Create an identity mapped page table and copy the wakeup routine to
67 * low memory.
68 */
69int acpi_save_state_mem(void)
70{
71	memcpy((void *)acpi_wakeup_address, &wakeup_start,
72	       &wakeup_end - &wakeup_start);
73	acpi_copy_wakeup_routine(acpi_wakeup_address);
74
75	return 0;
76}
77
78/*
79 * acpi_restore_state
80 */
81void acpi_restore_state_mem(void)
82{
83}
84
85/**
86 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
87 *
88 * We allocate a page in low memory for the wakeup
89 * routine for when we come back from a sleep state. The
90 * runtime allocator allows specification of <16M pages, but not
91 * <1M pages.
92 */
93void __init acpi_reserve_bootmem(void)
94{
95	acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
96	if ((&wakeup_end - &wakeup_start) > (PAGE_SIZE*2))
97		printk(KERN_CRIT
98		       "ACPI: Wakeup code way too big, will crash on attempt"
99		       " to suspend\n");
100}
101
102static int __init acpi_sleep_setup(char *str)
103{
104	while ((str != NULL) && (*str != '\0')) {
105		if (strncmp(str, "s3_bios", 7) == 0)
106			acpi_video_flags = 1;
107		if (strncmp(str, "s3_mode", 7) == 0)
108			acpi_video_flags |= 2;
109		str = strchr(str, ',');
110		if (str != NULL)
111			str += strspn(str, ", \t");
112	}
113	return 1;
114}
115
116__setup("acpi_sleep=", acpi_sleep_setup);
117
118#endif				/*CONFIG_ACPI_SLEEP */
119
120void acpi_pci_link_exit(void)
121{
122}
123