2 * acpi.c - Architecture-Specific Low-Level ACPI Support
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
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29 #include <linux/config.h>
30 #include <linux/kernel.h>
31 #include <linux/init.h>
32 #include <linux/types.h>
33 #include <linux/stddef.h>
34 #include <linux/slab.h>
35 #include <linux/pci.h>
36 #include <linux/bootmem.h>
37 #include <linux/irq.h>
38 #include <linux/acpi.h>
39 #include <asm/mpspec.h>
42 #include <asm/apicdef.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>
51 /* --------------------------------------------------------------------------
52 Low-Level Sleep Support
53 -------------------------------------------------------------------------- */
55 #ifdef CONFIG_ACPI_SLEEP
57 /* address in low memory of the wakeup routine. */
58 unsigned long acpi_wakeup_address = 0;
59 unsigned long acpi_video_flags;
60 extern char wakeup_start, wakeup_end;
62 extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));
64 static void init_low_mapping(void)
66 cpu_pda[0].level4_pgt[0] = cpu_pda[0].level4_pgt[pml4_index(PAGE_OFFSET)];
71 * acpi_save_state_mem - save kernel state
73 * Create an identity mapped page table and copy the wakeup routine to
76 int acpi_save_state_mem (void)
80 memcpy((void *) acpi_wakeup_address, &wakeup_start, &wakeup_end - &wakeup_start);
81 acpi_copy_wakeup_routine(acpi_wakeup_address);
87 * acpi_save_state_disk - save kernel state to disk
90 int acpi_save_state_disk (void)
98 void acpi_restore_state_mem (void)
100 cpu_pda[0].level4_pgt[0] = 0;
105 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
107 * We allocate a page in low memory for the wakeup
108 * routine for when we come back from a sleep state. The
109 * runtime allocator allows specification of <16M pages, but not
112 void __init acpi_reserve_bootmem(void)
114 acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
115 if ((&wakeup_end - &wakeup_start) > PAGE_SIZE)
116 printk(KERN_CRIT "ACPI: Wakeup code way too big, will crash on attempt to suspend\n");
119 static int __init acpi_sleep_setup(char *str)
121 while ((str != NULL) && (*str != '\0')) {
122 if (strncmp(str, "s3_bios", 7) == 0)
123 acpi_video_flags = 1;
124 if (strncmp(str, "s3_mode", 7) == 0)
125 acpi_video_flags |= 2;
126 str = strchr(str, ',');
128 str += strspn(str, ", \t");
133 __setup("acpi_sleep=", acpi_sleep_setup);
135 #endif /*CONFIG_ACPI_SLEEP*/
137 void acpi_pci_link_exit(void) {}