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 * acpi_suspend_lowlevel - save kernel state
31 * Create an identity mapped page table and copy the wakeup routine to
34 int acpi_suspend_lowlevel(void)
36 struct wakeup_header *header =
37 (struct wakeup_header *) __va(real_mode_header->wakeup_header);
39 if (header->signature != WAKEUP_HEADER_SIGNATURE) {
40 printk(KERN_ERR "wakeup header does not match\n");
44 header->video_mode = saved_video_mode;
47 store_gdt((struct desc_ptr *)&header->pmode_gdt);
49 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
50 &header->pmode_efer_high))
51 header->pmode_efer_low = header->pmode_efer_high = 0;
52 #endif /* !CONFIG_64BIT */
54 header->pmode_cr0 = read_cr0();
55 header->pmode_cr4 = read_cr4_safe();
56 header->pmode_behavior = 0;
57 if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
58 &header->pmode_misc_en_low,
59 &header->pmode_misc_en_high))
60 header->pmode_behavior |=
61 (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
62 header->realmode_flags = acpi_realmode_flags;
63 header->real_magic = 0x12345678;
66 header->pmode_entry = (u32)&wakeup_pmode_return;
67 header->pmode_cr3 = (u32)__pa(&initial_page_table);
68 saved_magic = 0x12345678;
69 #else /* CONFIG_64BIT */
71 stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
72 early_gdt_descr.address =
73 (unsigned long)get_cpu_gdt_table(smp_processor_id());
74 initial_gs = per_cpu_offset(smp_processor_id());
76 initial_code = (unsigned long)wakeup_long64;
77 saved_magic = 0x123456789abcdef0L;
78 #endif /* CONFIG_64BIT */
80 do_suspend_lowlevel();
84 static int __init acpi_sleep_setup(char *str)
86 while ((str != NULL) && (*str != '\0')) {
87 if (strncmp(str, "s3_bios", 7) == 0)
88 acpi_realmode_flags |= 1;
89 if (strncmp(str, "s3_mode", 7) == 0)
90 acpi_realmode_flags |= 2;
91 if (strncmp(str, "s3_beep", 7) == 0)
92 acpi_realmode_flags |= 4;
93 #ifdef CONFIG_HIBERNATION
94 if (strncmp(str, "s4_nohwsig", 10) == 0)
95 acpi_no_s4_hw_signature();
97 if (strncmp(str, "nonvs", 5) == 0)
99 if (strncmp(str, "old_ordering", 12) == 0)
100 acpi_old_suspend_ordering();
101 str = strchr(str, ',');
103 str += strspn(str, ", \t");
108 __setup("acpi_sleep=", acpi_sleep_setup);