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