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