2 * sleep.c - x86-specific ACPI sleep support.
4 * Copyright (C) 2001-2003 Patrick Mochel
5 * Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz>
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>
15 #include <asm/pgtable.h>
16 #include <asm/cacheflush.h>
17 #include <asm/realmode.h>
19 #include "../../realmode/rm/wakeup.h"
22 unsigned long acpi_realmode_flags;
24 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
25 static char temp_stack[4096];
29 * x86_acpi_enter_sleep_state - enter sleep state
30 * @state: Sleep state to enter.
32 * Wrapper around acpi_enter_sleep_state() to be called by assmebly.
34 acpi_status asmlinkage x86_acpi_enter_sleep_state(u8 state)
36 return acpi_enter_sleep_state(state);
40 * x86_acpi_suspend_lowlevel - save kernel state
42 * Create an identity mapped page table and copy the wakeup routine to
45 int x86_acpi_suspend_lowlevel(void)
47 struct wakeup_header *header =
48 (struct wakeup_header *) __va(real_mode_header->wakeup_header);
50 if (header->signature != WAKEUP_HEADER_SIGNATURE) {
51 printk(KERN_ERR "wakeup header does not match\n");
55 header->video_mode = saved_video_mode;
57 header->pmode_behavior = 0;
60 native_store_gdt((struct desc_ptr *)&header->pmode_gdt);
63 * We have to check that we can write back the value, and not
64 * just read it. At least on 90 nm Pentium M (Family 6, Model
65 * 13), reading an invalid MSR is not guaranteed to trap, see
66 * Erratum X4 in "Intel Pentium M Processor on 90 nm Process
67 * with 2-MB L2 Cache and IntelĀ® Processor A100 and A110 on 90
68 * nm process with 512-KB L2 Cache Specification Update".
70 if (!rdmsr_safe(MSR_EFER,
71 &header->pmode_efer_low,
72 &header->pmode_efer_high) &&
74 header->pmode_efer_low,
75 header->pmode_efer_high))
76 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER);
77 #endif /* !CONFIG_64BIT */
79 header->pmode_cr0 = read_cr0();
80 if (__this_cpu_read(cpu_info.cpuid_level) >= 0) {
81 header->pmode_cr4 = read_cr4();
82 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4);
84 if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
85 &header->pmode_misc_en_low,
86 &header->pmode_misc_en_high) &&
87 !wrmsr_safe(MSR_IA32_MISC_ENABLE,
88 header->pmode_misc_en_low,
89 header->pmode_misc_en_high))
90 header->pmode_behavior |=
91 (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
92 header->realmode_flags = acpi_realmode_flags;
93 header->real_magic = 0x12345678;
96 header->pmode_entry = (u32)&wakeup_pmode_return;
97 header->pmode_cr3 = (u32)__pa_symbol(initial_page_table);
98 saved_magic = 0x12345678;
99 #else /* CONFIG_64BIT */
101 stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
102 early_gdt_descr.address =
103 (unsigned long)get_cpu_gdt_table(smp_processor_id());
104 initial_gs = per_cpu_offset(smp_processor_id());
106 initial_code = (unsigned long)wakeup_long64;
107 saved_magic = 0x123456789abcdef0L;
108 #endif /* CONFIG_64BIT */
110 do_suspend_lowlevel();
114 static int __init acpi_sleep_setup(char *str)
116 while ((str != NULL) && (*str != '\0')) {
117 if (strncmp(str, "s3_bios", 7) == 0)
118 acpi_realmode_flags |= 1;
119 if (strncmp(str, "s3_mode", 7) == 0)
120 acpi_realmode_flags |= 2;
121 if (strncmp(str, "s3_beep", 7) == 0)
122 acpi_realmode_flags |= 4;
123 #ifdef CONFIG_HIBERNATION
124 if (strncmp(str, "s4_nohwsig", 10) == 0)
125 acpi_no_s4_hw_signature();
127 if (strncmp(str, "nonvs", 5) == 0)
129 if (strncmp(str, "nonvs_s3", 8) == 0)
130 acpi_nvs_nosave_s3();
131 if (strncmp(str, "old_ordering", 12) == 0)
132 acpi_old_suspend_ordering();
133 str = strchr(str, ',');
135 str += strspn(str, ", \t");
140 __setup("acpi_sleep=", acpi_sleep_setup);