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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@ucw.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 #ifdef CONFIG_X86_32
17 #include <asm/pgtable.h>
18 #include <asm/pgtable_32.h>
19 #endif
20
21 #include "realmode/wakeup.h"
22 #include "sleep.h"
23
24 unsigned long acpi_wakeup_address;
25 unsigned long acpi_realmode_flags;
26
27 /* address in low memory of the wakeup routine. */
28 static unsigned long acpi_realmode;
29
30 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
31 static char temp_stack[4096];
32 #endif
33
34 /**
35  * acpi_save_state_mem - save kernel state
36  *
37  * Create an identity mapped page table and copy the wakeup routine to
38  * low memory.
39  *
40  * Note that this is too late to change acpi_wakeup_address.
41  */
42 int acpi_save_state_mem(void)
43 {
44         struct wakeup_header *header;
45
46         if (!acpi_realmode) {
47                 printk(KERN_ERR "Could not allocate memory during boot, "
48                        "S3 disabled\n");
49                 return -ENOMEM;
50         }
51         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
52
53         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
54         if (header->signature != 0x51ee1111) {
55                 printk(KERN_ERR "wakeup header does not match\n");
56                 return -EINVAL;
57         }
58
59         header->video_mode = saved_video_mode;
60
61         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
62
63         /*
64          * Set up the wakeup GDT.  We set these up as Big Real Mode,
65          * that is, with limits set to 4 GB.  At least the Lenovo
66          * Thinkpad X61 is known to need this for the video BIOS
67          * initialization quirk to work; this is likely to also
68          * be the case for other laptops or integrated video devices.
69          */
70
71         /* GDT[0]: GDT self-pointer */
72         header->wakeup_gdt[0] =
73                 (u64)(sizeof(header->wakeup_gdt) - 1) +
74                 ((u64)(acpi_wakeup_address +
75                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
76                                 << 16);
77         /* GDT[1]: big real mode-like code segment */
78         header->wakeup_gdt[1] =
79                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
80         /* GDT[2]: big real mode-like data segment */
81         header->wakeup_gdt[2] =
82                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
83
84 #ifndef CONFIG_64BIT
85         store_gdt((struct desc_ptr *)&header->pmode_gdt);
86
87         if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
88                        &header->pmode_efer_high))
89                 header->pmode_efer_low = header->pmode_efer_high = 0;
90 #endif /* !CONFIG_64BIT */
91
92         header->pmode_cr0 = read_cr0();
93         header->pmode_cr4 = read_cr4_safe();
94         header->realmode_flags = acpi_realmode_flags;
95         header->real_magic = 0x12345678;
96
97 #ifndef CONFIG_64BIT
98         header->pmode_entry = (u32)&wakeup_pmode_return;
99         header->pmode_cr3 = (u32)__pa(&initial_page_table);
100         saved_magic = 0x12345678;
101 #else /* CONFIG_64BIT */
102         header->trampoline_segment = setup_trampoline() >> 4;
103 #ifdef CONFIG_SMP
104         stack_start.sp = temp_stack + sizeof(temp_stack);
105         early_gdt_descr.address =
106                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
107         initial_gs = per_cpu_offset(smp_processor_id());
108 #endif
109         initial_code = (unsigned long)wakeup_long64;
110        saved_magic = 0x123456789abcdef0L;
111 #endif /* CONFIG_64BIT */
112
113         return 0;
114 }
115
116 /*
117  * acpi_restore_state - undo effects of acpi_save_state_mem
118  */
119 void acpi_restore_state_mem(void)
120 {
121 }
122
123
124 /**
125  * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
126  *
127  * We allocate a page from the first 1MB of memory for the wakeup
128  * routine for when we come back from a sleep state. The
129  * runtime allocator allows specification of <16MB pages, but not
130  * <1MB pages.
131  */
132 void __init acpi_reserve_wakeup_memory(void)
133 {
134         phys_addr_t mem;
135
136         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
137                 printk(KERN_ERR
138                        "ACPI: Wakeup code way too big, S3 disabled.\n");
139                 return;
140         }
141
142         mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
143
144         if (mem == MEMBLOCK_ERROR) {
145                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
146                 return;
147         }
148         acpi_realmode = (unsigned long) phys_to_virt(mem);
149         acpi_wakeup_address = mem;
150         memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
151 }
152
153
154 static int __init acpi_sleep_setup(char *str)
155 {
156         while ((str != NULL) && (*str != '\0')) {
157                 if (strncmp(str, "s3_bios", 7) == 0)
158                         acpi_realmode_flags |= 1;
159                 if (strncmp(str, "s3_mode", 7) == 0)
160                         acpi_realmode_flags |= 2;
161                 if (strncmp(str, "s3_beep", 7) == 0)
162                         acpi_realmode_flags |= 4;
163 #ifdef CONFIG_HIBERNATION
164                 if (strncmp(str, "s4_nohwsig", 10) == 0)
165                         acpi_no_s4_hw_signature();
166                 if (strncmp(str, "s4_nonvs", 8) == 0) {
167                         pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
168                                         "please use acpi_sleep=nonvs instead");
169                         acpi_nvs_nosave();
170                 }
171 #endif
172                 if (strncmp(str, "nonvs", 5) == 0)
173                         acpi_nvs_nosave();
174                 if (strncmp(str, "old_ordering", 12) == 0)
175                         acpi_old_suspend_ordering();
176                 str = strchr(str, ',');
177                 if (str != NULL)
178                         str += strspn(str, ", \t");
179         }
180         return 1;
181 }
182
183 __setup("acpi_sleep=", acpi_sleep_setup);