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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/dmi.h>
11 #include <linux/cpumask.h>
12 #include <asm/segment.h>
13 #include <asm/desc.h>
14
15 #ifdef CONFIG_X86_32
16 #include <asm/pgtable.h>
17 #include <asm/pgtable_32.h>
18 #endif
19
20 #include "realmode/wakeup.h"
21 #include "sleep.h"
22
23 unsigned long acpi_wakeup_address;
24 unsigned long acpi_realmode_flags;
25
26 /* address in low memory of the wakeup routine. */
27 static unsigned long acpi_realmode;
28
29 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
30 static char temp_stack[4096];
31 #endif
32
33 /**
34  * acpi_save_state_mem - save kernel state
35  *
36  * Create an identity mapped page table and copy the wakeup routine to
37  * low memory.
38  *
39  * Note that this is too late to change acpi_wakeup_address.
40  */
41 int acpi_save_state_mem(void)
42 {
43         struct wakeup_header *header;
44
45         if (!acpi_realmode) {
46                 printk(KERN_ERR "Could not allocate memory during boot, "
47                        "S3 disabled\n");
48                 return -ENOMEM;
49         }
50         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
51
52         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
53         if (header->signature != 0x51ee1111) {
54                 printk(KERN_ERR "wakeup header does not match\n");
55                 return -EINVAL;
56         }
57
58         header->video_mode = saved_video_mode;
59
60         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
61
62         /*
63          * Set up the wakeup GDT.  We set these up as Big Real Mode,
64          * that is, with limits set to 4 GB.  At least the Lenovo
65          * Thinkpad X61 is known to need this for the video BIOS
66          * initialization quirk to work; this is likely to also
67          * be the case for other laptops or integrated video devices.
68          */
69
70         /* GDT[0]: GDT self-pointer */
71         header->wakeup_gdt[0] =
72                 (u64)(sizeof(header->wakeup_gdt) - 1) +
73                 ((u64)(acpi_wakeup_address +
74                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
75                                 << 16);
76         /* GDT[1]: big real mode-like code segment */
77         header->wakeup_gdt[1] =
78                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
79         /* GDT[2]: big real mode-like data segment */
80         header->wakeup_gdt[2] =
81                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
82
83 #ifndef CONFIG_64BIT
84         store_gdt((struct desc_ptr *)&header->pmode_gdt);
85
86         if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
87                        &header->pmode_efer_high))
88                 header->pmode_efer_low = header->pmode_efer_high = 0;
89 #endif /* !CONFIG_64BIT */
90
91         header->pmode_cr0 = read_cr0();
92         header->pmode_cr4 = read_cr4_safe();
93         header->realmode_flags = acpi_realmode_flags;
94         header->real_magic = 0x12345678;
95
96 #ifndef CONFIG_64BIT
97         header->pmode_entry = (u32)&wakeup_pmode_return;
98         header->pmode_cr3 = (u32)__pa(&initial_page_table);
99         saved_magic = 0x12345678;
100 #else /* CONFIG_64BIT */
101         header->trampoline_segment = setup_trampoline() >> 4;
102 #ifdef CONFIG_SMP
103         stack_start.sp = temp_stack + sizeof(temp_stack);
104         early_gdt_descr.address =
105                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
106         initial_gs = per_cpu_offset(smp_processor_id());
107 #endif
108         initial_code = (unsigned long)wakeup_long64;
109        saved_magic = 0x123456789abcdef0L;
110 #endif /* CONFIG_64BIT */
111
112         return 0;
113 }
114
115 /*
116  * acpi_restore_state - undo effects of acpi_save_state_mem
117  */
118 void acpi_restore_state_mem(void)
119 {
120 }
121
122
123 /**
124  * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
125  *
126  * We allocate a page from the first 1MB of memory for the wakeup
127  * routine for when we come back from a sleep state. The
128  * runtime allocator allows specification of <16MB pages, but not
129  * <1MB pages.
130  */
131 void __init acpi_reserve_wakeup_memory(void)
132 {
133         unsigned long mem;
134
135         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
136                 printk(KERN_ERR
137                        "ACPI: Wakeup code way too big, S3 disabled.\n");
138                 return;
139         }
140
141         mem = find_e820_area(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
142
143         if (mem == -1L) {
144                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
145                 return;
146         }
147         acpi_realmode = (unsigned long) phys_to_virt(mem);
148         acpi_wakeup_address = mem;
149         reserve_early(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
150 }
151
152
153 static int __init acpi_sleep_setup(char *str)
154 {
155         while ((str != NULL) && (*str != '\0')) {
156                 if (strncmp(str, "s3_bios", 7) == 0)
157                         acpi_realmode_flags |= 1;
158                 if (strncmp(str, "s3_mode", 7) == 0)
159                         acpi_realmode_flags |= 2;
160                 if (strncmp(str, "s3_beep", 7) == 0)
161                         acpi_realmode_flags |= 4;
162 #ifdef CONFIG_HIBERNATION
163                 if (strncmp(str, "s4_nohwsig", 10) == 0)
164                         acpi_no_s4_hw_signature();
165                 if (strncmp(str, "s4_nonvs", 8) == 0) {
166                         pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
167                                         "please use acpi_sleep=nonvs instead");
168                         acpi_nvs_nosave();
169                 }
170 #endif
171                 if (strncmp(str, "nonvs", 5) == 0)
172                         acpi_nvs_nosave();
173                 if (strncmp(str, "old_ordering", 12) == 0)
174                         acpi_old_suspend_ordering();
175                 str = strchr(str, ',');
176                 if (str != NULL)
177                         str += strspn(str, ", \t");
178         }
179         return 1;
180 }
181
182 __setup("acpi_sleep=", acpi_sleep_setup);