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1da177e4 LT |
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/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> | |
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 | ||
1da177e4 LT |
50 | /* -------------------------------------------------------------------------- |
51 | Low-Level Sleep Support | |
52 | -------------------------------------------------------------------------- */ | |
53 | ||
54 | #ifdef CONFIG_ACPI_SLEEP | |
55 | ||
56 | /* address in low memory of the wakeup routine. */ | |
57 | unsigned long acpi_wakeup_address = 0; | |
58 | unsigned long acpi_video_flags; | |
59 | extern char wakeup_start, wakeup_end; | |
60 | ||
61 | extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long)); | |
62 | ||
63 | static pgd_t low_ptr; | |
64 | ||
65 | static void init_low_mapping(void) | |
66 | { | |
67 | pgd_t *slot0 = pgd_offset(current->mm, 0UL); | |
68 | low_ptr = *slot0; | |
69 | set_pgd(slot0, *pgd_offset(current->mm, PAGE_OFFSET)); | |
70 | flush_tlb_all(); | |
71 | } | |
72 | ||
73 | /** | |
74 | * acpi_save_state_mem - save kernel state | |
75 | * | |
76 | * Create an identity mapped page table and copy the wakeup routine to | |
77 | * low memory. | |
78 | */ | |
4be44fcd | 79 | int acpi_save_state_mem(void) |
1da177e4 LT |
80 | { |
81 | init_low_mapping(); | |
82 | ||
4be44fcd LB |
83 | memcpy((void *)acpi_wakeup_address, &wakeup_start, |
84 | &wakeup_end - &wakeup_start); | |
1da177e4 LT |
85 | acpi_copy_wakeup_routine(acpi_wakeup_address); |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | /* | |
91 | * acpi_restore_state | |
92 | */ | |
4be44fcd | 93 | void acpi_restore_state_mem(void) |
1da177e4 LT |
94 | { |
95 | set_pgd(pgd_offset(current->mm, 0UL), low_ptr); | |
96 | flush_tlb_all(); | |
97 | } | |
98 | ||
99 | /** | |
100 | * acpi_reserve_bootmem - do _very_ early ACPI initialisation | |
101 | * | |
102 | * We allocate a page in low memory for the wakeup | |
103 | * routine for when we come back from a sleep state. The | |
104 | * runtime allocator allows specification of <16M pages, but not | |
105 | * <1M pages. | |
106 | */ | |
107 | void __init acpi_reserve_bootmem(void) | |
108 | { | |
109 | acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE); | |
110 | if ((&wakeup_end - &wakeup_start) > PAGE_SIZE) | |
4be44fcd LB |
111 | printk(KERN_CRIT |
112 | "ACPI: Wakeup code way too big, will crash on attempt to suspend\n"); | |
1da177e4 LT |
113 | } |
114 | ||
115 | static int __init acpi_sleep_setup(char *str) | |
116 | { | |
117 | while ((str != NULL) && (*str != '\0')) { | |
118 | if (strncmp(str, "s3_bios", 7) == 0) | |
119 | acpi_video_flags = 1; | |
120 | if (strncmp(str, "s3_mode", 7) == 0) | |
121 | acpi_video_flags |= 2; | |
122 | str = strchr(str, ','); | |
123 | if (str != NULL) | |
124 | str += strspn(str, ", \t"); | |
125 | } | |
126 | return 1; | |
127 | } | |
128 | ||
129 | __setup("acpi_sleep=", acpi_sleep_setup); | |
130 | ||
4be44fcd | 131 | #endif /*CONFIG_ACPI_SLEEP */ |
1da177e4 | 132 | |
4be44fcd LB |
133 | void acpi_pci_link_exit(void) |
134 | { | |
135 | } |