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/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>
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>
50 /* --------------------------------------------------------------------------
51 Low-Level Sleep Support
52 -------------------------------------------------------------------------- */
54 #ifndef CONFIG_ACPI_PV_SLEEP
55 /* address in low memory of the wakeup routine. */
56 unsigned long acpi_wakeup_address = 0;
57 unsigned long acpi_realmode_flags;
58 extern char wakeup_start, wakeup_end;
60 extern unsigned long acpi_copy_wakeup_routine(unsigned long);
64 * acpi_save_state_mem - save kernel state
66 * Create an identity mapped page table and copy the wakeup routine to
69 int acpi_save_state_mem(void)
71 #ifndef CONFIG_ACPI_PV_SLEEP
72 memcpy((void *)acpi_wakeup_address, &wakeup_start,
73 &wakeup_end - &wakeup_start);
74 acpi_copy_wakeup_routine(acpi_wakeup_address);
82 void acpi_restore_state_mem(void)
87 * acpi_reserve_bootmem - do _very_ early ACPI initialisation
89 * We allocate a page in low memory for the wakeup
90 * routine for when we come back from a sleep state. The
91 * runtime allocator allows specification of <16M pages, but not
94 void __init acpi_reserve_bootmem(void)
96 #ifndef CONFIG_ACPI_PV_SLEEP
97 acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
98 if ((&wakeup_end - &wakeup_start) > (PAGE_SIZE*2))
100 "ACPI: Wakeup code way too big, will crash on attempt"
105 #ifndef CONFIG_ACPI_PV_SLEEP
106 static int __init acpi_sleep_setup(char *str)
108 while ((str != NULL) && (*str != '\0')) {
109 if (strncmp(str, "s3_bios", 7) == 0)
110 acpi_realmode_flags |= 1;
111 if (strncmp(str, "s3_mode", 7) == 0)
112 acpi_realmode_flags |= 2;
113 if (strncmp(str, "s3_beep", 7) == 0)
114 acpi_realmode_flags |= 4;
115 str = strchr(str, ',');
117 str += strspn(str, ", \t");
123 __setup("acpi_sleep=", acpi_sleep_setup);
125 #else /* CONFIG_ACPI_PV_SLEEP */
126 #include <asm/hypervisor.h>
127 #include <xen/interface/platform.h>
128 int acpi_notify_hypervisor_state(u8 sleep_state,
129 u32 pm1a_cnt, u32 pm1b_cnt)
131 struct xen_platform_op op = {
132 .cmd = XENPF_enter_acpi_sleep,
133 .interface_version = XENPF_INTERFACE_VERSION,
135 .enter_acpi_sleep = {
136 .pm1a_cnt_val = (u16)pm1a_cnt,
137 .pm1b_cnt_val = (u16)pm1b_cnt,
138 .sleep_state = sleep_state,
143 return HYPERVISOR_platform_op(&op);
145 #endif /* CONFIG_ACPI_PV_SLEEP */