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
  16 #ifdef CONFIG_X86_32
  17 #include <asm/pgtable.h>
  18 #include <asm/pgtable_32.h>
  19 #endif
  20
  21 #include "realmode/wakeup.h"
  22 #include "sleep.h"
  23
  24 unsigned long acpi_wakeup_address;
  25 unsigned long acpi_realmode_flags;
  26
  27 /* address in low memory of the wakeup routine. */
  28 static unsigned long acpi_realmode;
  29
  30 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
  31 static char temp_stack[4096];
  32 #endif
  33
  34 /**
  35  * acpi_save_state_mem - save kernel state
  36  *
  37  * Create an identity mapped page table and copy the wakeup routine to
  38  * low memory.
  39  *
  40  * Note that this is too late to change acpi_wakeup_address.
  41  */
  42 int acpi_save_state_mem(void)
  43 {
  44         struct wakeup_header *header;
  45
  46         if (!acpi_realmode) {
  47                 printk(KERN_ERR "Could not allocate memory during boot, "
  48                        "S3 disabled\n");
  49                 return -ENOMEM;
  50         }
  51         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
  52
  53         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
  54         if (header->signature != 0x51ee1111) {
  55                 printk(KERN_ERR "wakeup header does not match\n");
  56                 return -EINVAL;
  57         }
  58
  59         header->video_mode = saved_video_mode;
  60
  61         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
  62
  63         /*
  64          * Set up the wakeup GDT.  We set these up as Big Real Mode,
  65          * that is, with limits set to 4 GB.  At least the Lenovo
  66          * Thinkpad X61 is known to need this for the video BIOS
  67          * initialization quirk to work; this is likely to also
  68          * be the case for other laptops or integrated video devices.
  69          */
  70
  71         /* GDT[0]: GDT self-pointer */
  72         header->wakeup_gdt[0] =
  73                 (u64)(sizeof(header->wakeup_gdt) - 1) +
  74                 ((u64)(acpi_wakeup_address +
  75                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
  76                                 << 16);
  77         /* GDT[1]: big real mode-like code segment */
  78         header->wakeup_gdt[1] =
  79                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
  80         /* GDT[2]: big real mode-like data segment */
  81         header->wakeup_gdt[2] =
  82                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
  83
  84 #ifndef CONFIG_64BIT
  85         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  86
  87         if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
  88                        &header->pmode_efer_high))
  89                 header->pmode_efer_low = header->pmode_efer_high = 0;
  90 #endif /* !CONFIG_64BIT */
  91
  92         header->pmode_cr0 = read_cr0();
  93         header->pmode_cr4 = read_cr4_safe();
  94         header->realmode_flags = acpi_realmode_flags;
  95         header->real_magic = 0x12345678;
  96
  97 #ifndef CONFIG_64BIT
  98         header->pmode_entry = (u32)&wakeup_pmode_return;
  99         header->pmode_cr3 = (u32)__pa(&initial_page_table);
 100         saved_magic = 0x12345678;
 101 #else /* CONFIG_64BIT */
 102         header->trampoline_segment = setup_trampoline() >> 4;
 103 #ifdef CONFIG_SMP
 104         stack_start.sp = temp_stack + sizeof(temp_stack);
 105         early_gdt_descr.address =
 106                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
 107         initial_gs = per_cpu_offset(smp_processor_id());
 108 #endif
 109         initial_code = (unsigned long)wakeup_long64;
 110        saved_magic = 0x123456789abcdef0L;
 111 #endif /* CONFIG_64BIT */
 112
 113         return 0;
 114 }
 115
 116 /*
 117  * acpi_restore_state - undo effects of acpi_save_state_mem
 118  */
 119 void acpi_restore_state_mem(void)
 120 {
 121 }
 122
 123
 124 /**
 125  * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
 126  *
 127  * We allocate a page from the first 1MB of memory for the wakeup
 128  * routine for when we come back from a sleep state. The
 129  * runtime allocator allows specification of <16MB pages, but not
 130  * <1MB pages.
 131  */
 132 void __init acpi_reserve_wakeup_memory(void)
 133 {
 134         phys_addr_t mem;
 135
 136         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
 137                 printk(KERN_ERR
 138                        "ACPI: Wakeup code way too big, S3 disabled.\n");
 139                 return;
 140         }
 141
 142         mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
 143
 144         if (mem == MEMBLOCK_ERROR) {
 145                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
 146                 return;
 147         }
 148         acpi_realmode = (unsigned long) phys_to_virt(mem);
 149         acpi_wakeup_address = mem;
 150         memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
 151 }
 152
 153
 154 static int __init acpi_sleep_setup(char *str)
 155 {
 156         while ((str != NULL) && (*str != '\0')) {
 157                 if (strncmp(str, "s3_bios", 7) == 0)
 158                         acpi_realmode_flags |= 1;
 159                 if (strncmp(str, "s3_mode", 7) == 0)
 160                         acpi_realmode_flags |= 2;
 161                 if (strncmp(str, "s3_beep", 7) == 0)
 162                         acpi_realmode_flags |= 4;
 163 #ifdef CONFIG_HIBERNATION
 164                 if (strncmp(str, "s4_nohwsig", 10) == 0)
 165                         acpi_no_s4_hw_signature();
 166                 if (strncmp(str, "s4_nonvs", 8) == 0) {
 167                         pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
 168                                         "please use acpi_sleep=nonvs instead");
 169                         acpi_nvs_nosave();
 170                 }
 171 #endif
 172                 if (strncmp(str, "nonvs", 5) == 0)
 173                         acpi_nvs_nosave();
 174                 if (strncmp(str, "old_ordering", 12) == 0)
 175                         acpi_old_suspend_ordering();
 176                 str = strchr(str, ',');
 177                 if (str != NULL)
 178                         str += strspn(str, ", \t");
 179         }
 180         return 1;
 181 }
 182
 183 __setup("acpi_sleep=", acpi_sleep_setup);