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@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 #include <asm/pgtable.h>
  16 #include <asm/cacheflush.h>
  17
  18 #include <linux/ftrace.h>
  19 #include "realmode/wakeup.h"
  20 #include "sleep.h"
  21
  22 unsigned long acpi_realmode_flags;
  23
  24 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
  25 static char temp_stack[4096];
  26 #endif
  27
  28 /**
  29  * acpi_suspend_lowlevel - save kernel state
  30  *
  31  * Create an identity mapped page table and copy the wakeup routine to
  32  * low memory.
  33  */
  34 int acpi_suspend_lowlevel(void)
  35 {
  36         struct wakeup_header *header;
  37         /* address in low memory of the wakeup routine. */
  38         char *acpi_realmode;
  39
  40         acpi_realmode = TRAMPOLINE_SYM(acpi_wakeup_code);
  41
  42         header = (struct wakeup_header *)(acpi_realmode + WAKEUP_HEADER_OFFSET);
  43         if (header->signature != WAKEUP_HEADER_SIGNATURE) {
  44                 printk(KERN_ERR "wakeup header does not match\n");
  45                 return -EINVAL;
  46         }
  47
  48         header->video_mode = saved_video_mode;
  49
  50         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
  51
  52         /*
  53          * Set up the wakeup GDT.  We set these up as Big Real Mode,
  54          * that is, with limits set to 4 GB.  At least the Lenovo
  55          * Thinkpad X61 is known to need this for the video BIOS
  56          * initialization quirk to work; this is likely to also
  57          * be the case for other laptops or integrated video devices.
  58          */
  59
  60         /* GDT[0]: GDT self-pointer */
  61         header->wakeup_gdt[0] =
  62                 (u64)(sizeof(header->wakeup_gdt) - 1) +
  63                 ((u64)__pa(&header->wakeup_gdt) << 16);
  64         /* GDT[1]: big real mode-like code segment */
  65         header->wakeup_gdt[1] =
  66                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
  67         /* GDT[2]: big real mode-like data segment */
  68         header->wakeup_gdt[2] =
  69                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
  70
  71 #ifndef CONFIG_64BIT
  72         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  73
  74         if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
  75                        &header->pmode_efer_high))
  76                 header->pmode_efer_low = header->pmode_efer_high = 0;
  77 #endif /* !CONFIG_64BIT */
  78
  79         header->pmode_cr0 = read_cr0();
  80         header->pmode_cr4 = read_cr4_safe();
  81         header->pmode_behavior = 0;
  82         if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
  83                         &header->pmode_misc_en_low,
  84                         &header->pmode_misc_en_high))
  85                 header->pmode_behavior |=
  86                         (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
  87         header->realmode_flags = acpi_realmode_flags;
  88         header->real_magic = 0x12345678;
  89
  90 #ifndef CONFIG_64BIT
  91         header->pmode_entry = (u32)&wakeup_pmode_return;
  92         header->pmode_cr3 = (u32)__pa(&initial_page_table);
  93         saved_magic = 0x12345678;
  94 #else /* CONFIG_64BIT */
  95         header->trampoline_segment = trampoline_address() >> 4;
  96 #ifdef CONFIG_SMP
  97         stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
  98         early_gdt_descr.address =
  99                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
 100         initial_gs = per_cpu_offset(smp_processor_id());
 101 #endif
 102         initial_code = (unsigned long)wakeup_long64;
 103        saved_magic = 0x123456789abcdef0L;
 104 #endif /* CONFIG_64BIT */
 105
 106         /*
 107          * Pause/unpause graph tracing around do_suspend_lowlevel as it has
 108          * inconsistent call/return info after it jumps to the wakeup vector.
 109          */
 110         pause_graph_tracing();
 111         do_suspend_lowlevel();
 112         unpause_graph_tracing();
 113         return 0;
 114 }
 115
 116 static int __init acpi_sleep_setup(char *str)
 117 {
 118         while ((str != NULL) && (*str != '\0')) {
 119                 if (strncmp(str, "s3_bios", 7) == 0)
 120                         acpi_realmode_flags |= 1;
 121                 if (strncmp(str, "s3_mode", 7) == 0)
 122                         acpi_realmode_flags |= 2;
 123                 if (strncmp(str, "s3_beep", 7) == 0)
 124                         acpi_realmode_flags |= 4;
 125 #ifdef CONFIG_HIBERNATION
 126                 if (strncmp(str, "s4_nohwsig", 10) == 0)
 127                         acpi_no_s4_hw_signature();
 128 #endif
 129                 if (strncmp(str, "nonvs", 5) == 0)
 130                         acpi_nvs_nosave();
 131                 if (strncmp(str, "old_ordering", 12) == 0)
 132                         acpi_old_suspend_ordering();
 133                 str = strchr(str, ',');
 134                 if (str != NULL)
 135                         str += strspn(str, ", \t");
 136         }
 137         return 1;
 138 }
 139
 140 __setup("acpi_sleep=", acpi_sleep_setup);