x86, memblock: Replace e820_/_early string with memblock_
[linux-3.10.git] / arch / x86 / kernel / acpi / sleep.c
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/memblock.h>
11 #include <linux/dmi.h>
12 #include <linux/cpumask.h>
13 #include <asm/segment.h>
14 #include <asm/desc.h>
15
16 #include "realmode/wakeup.h"
17 #include "sleep.h"
18
19 unsigned long acpi_wakeup_address;
20 unsigned long acpi_realmode_flags;
21
22 /* address in low memory of the wakeup routine. */
23 static unsigned long acpi_realmode;
24
25 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
26 static char temp_stack[4096];
27 #endif
28
29 /**
30  * acpi_save_state_mem - save kernel state
31  *
32  * Create an identity mapped page table and copy the wakeup routine to
33  * low memory.
34  *
35  * Note that this is too late to change acpi_wakeup_address.
36  */
37 int acpi_save_state_mem(void)
38 {
39         struct wakeup_header *header;
40
41         if (!acpi_realmode) {
42                 printk(KERN_ERR "Could not allocate memory during boot, "
43                        "S3 disabled\n");
44                 return -ENOMEM;
45         }
46         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
47
48         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
49         if (header->signature != 0x51ee1111) {
50                 printk(KERN_ERR "wakeup header does not match\n");
51                 return -EINVAL;
52         }
53
54         header->video_mode = saved_video_mode;
55
56         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
57
58         /*
59          * Set up the wakeup GDT.  We set these up as Big Real Mode,
60          * that is, with limits set to 4 GB.  At least the Lenovo
61          * Thinkpad X61 is known to need this for the video BIOS
62          * initialization quirk to work; this is likely to also
63          * be the case for other laptops or integrated video devices.
64          */
65
66         /* GDT[0]: GDT self-pointer */
67         header->wakeup_gdt[0] =
68                 (u64)(sizeof(header->wakeup_gdt) - 1) +
69                 ((u64)(acpi_wakeup_address +
70                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
71                                 << 16);
72         /* GDT[1]: big real mode-like code segment */
73         header->wakeup_gdt[1] =
74                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
75         /* GDT[2]: big real mode-like data segment */
76         header->wakeup_gdt[2] =
77                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
78
79 #ifndef CONFIG_64BIT
80         store_gdt((struct desc_ptr *)&header->pmode_gdt);
81
82         if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
83                        &header->pmode_efer_high))
84                 header->pmode_efer_low = header->pmode_efer_high = 0;
85 #endif /* !CONFIG_64BIT */
86
87         header->pmode_cr0 = read_cr0();
88         header->pmode_cr4 = read_cr4_safe();
89         header->realmode_flags = acpi_realmode_flags;
90         header->real_magic = 0x12345678;
91
92 #ifndef CONFIG_64BIT
93         header->pmode_entry = (u32)&wakeup_pmode_return;
94         header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
95         saved_magic = 0x12345678;
96 #else /* CONFIG_64BIT */
97         header->trampoline_segment = setup_trampoline() >> 4;
98 #ifdef CONFIG_SMP
99         stack_start.sp = temp_stack + sizeof(temp_stack);
100         early_gdt_descr.address =
101                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
102         initial_gs = per_cpu_offset(smp_processor_id());
103 #endif
104         initial_code = (unsigned long)wakeup_long64;
105        saved_magic = 0x123456789abcdef0L;
106 #endif /* CONFIG_64BIT */
107
108         return 0;
109 }
110
111 /*
112  * acpi_restore_state - undo effects of acpi_save_state_mem
113  */
114 void acpi_restore_state_mem(void)
115 {
116 }
117
118
119 /**
120  * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
121  *
122  * We allocate a page from the first 1MB of memory for the wakeup
123  * routine for when we come back from a sleep state. The
124  * runtime allocator allows specification of <16MB pages, but not
125  * <1MB pages.
126  */
127 void __init acpi_reserve_wakeup_memory(void)
128 {
129         phys_addr_t mem;
130
131         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
132                 printk(KERN_ERR
133                        "ACPI: Wakeup code way too big, S3 disabled.\n");
134                 return;
135         }
136
137         mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
138
139         if (mem == MEMBLOCK_ERROR) {
140                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
141                 return;
142         }
143         acpi_realmode = (unsigned long) phys_to_virt(mem);
144         acpi_wakeup_address = mem;
145         memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
146 }
147
148
149 static int __init acpi_sleep_setup(char *str)
150 {
151         while ((str != NULL) && (*str != '\0')) {
152                 if (strncmp(str, "s3_bios", 7) == 0)
153                         acpi_realmode_flags |= 1;
154                 if (strncmp(str, "s3_mode", 7) == 0)
155                         acpi_realmode_flags |= 2;
156                 if (strncmp(str, "s3_beep", 7) == 0)
157                         acpi_realmode_flags |= 4;
158 #ifdef CONFIG_HIBERNATION
159                 if (strncmp(str, "s4_nohwsig", 10) == 0)
160                         acpi_no_s4_hw_signature();
161                 if (strncmp(str, "s4_nonvs", 8) == 0) {
162                         pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
163                                         "please use acpi_sleep=nonvs instead");
164                         acpi_nvs_nosave();
165                 }
166 #endif
167                 if (strncmp(str, "nonvs", 5) == 0)
168                         acpi_nvs_nosave();
169                 if (strncmp(str, "old_ordering", 12) == 0)
170                         acpi_old_suspend_ordering();
171                 str = strchr(str, ',');
172                 if (str != NULL)
173                         str += strspn(str, ", \t");
174         }
175         return 1;
176 }
177
178 __setup("acpi_sleep=", acpi_sleep_setup);