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 #ifdef CONFIG_X86_32
  16 #include <asm/pgtable.h>
  17 #include <asm/pgtable_32.h>
  18 #endif
  19
  20 #include "realmode/wakeup.h"
  21 #include "sleep.h"
  22
  23 unsigned long acpi_wakeup_address;
  24 unsigned long acpi_realmode_flags;
  25
  26 /* address in low memory of the wakeup routine. */
  27 static unsigned long acpi_realmode;
  28
  29 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
  30 static char temp_stack[4096];
  31 #endif
  32
  33 /**
  34  * acpi_save_state_mem - save kernel state
  35  *
  36  * Create an identity mapped page table and copy the wakeup routine to
  37  * low memory.
  38  *
  39  * Note that this is too late to change acpi_wakeup_address.
  40  */
  41 int acpi_save_state_mem(void)
  42 {
  43         struct wakeup_header *header;
  44
  45         if (!acpi_realmode) {
  46                 printk(KERN_ERR "Could not allocate memory during boot, "
  47                        "S3 disabled\n");
  48                 return -ENOMEM;
  49         }
  50         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
  51
  52         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
  53         if (header->signature != 0x51ee1111) {
  54                 printk(KERN_ERR "wakeup header does not match\n");
  55                 return -EINVAL;
  56         }
  57
  58         header->video_mode = saved_video_mode;
  59
  60         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
  61
  62         /*
  63          * Set up the wakeup GDT.  We set these up as Big Real Mode,
  64          * that is, with limits set to 4 GB.  At least the Lenovo
  65          * Thinkpad X61 is known to need this for the video BIOS
  66          * initialization quirk to work; this is likely to also
  67          * be the case for other laptops or integrated video devices.
  68          */
  69
  70         /* GDT[0]: GDT self-pointer */
  71         header->wakeup_gdt[0] =
  72                 (u64)(sizeof(header->wakeup_gdt) - 1) +
  73                 ((u64)(acpi_wakeup_address +
  74                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
  75                                 << 16);
  76         /* GDT[1]: big real mode-like code segment */
  77         header->wakeup_gdt[1] =
  78                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
  79         /* GDT[2]: big real mode-like data segment */
  80         header->wakeup_gdt[2] =
  81                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
  82
  83 #ifndef CONFIG_64BIT
  84         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  85
  86         if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
  87                        &header->pmode_efer_high))
  88                 header->pmode_efer_low = header->pmode_efer_high = 0;
  89 #endif /* !CONFIG_64BIT */
  90
  91         header->pmode_cr0 = read_cr0();
  92         header->pmode_cr4 = read_cr4_safe();
  93         header->realmode_flags = acpi_realmode_flags;
  94         header->real_magic = 0x12345678;
  95
  96 #ifndef CONFIG_64BIT
  97         header->pmode_entry = (u32)&wakeup_pmode_return;
  98         header->pmode_cr3 = (u32)__pa(&initial_page_table);
  99         saved_magic = 0x12345678;
 100 #else /* CONFIG_64BIT */
 101         header->trampoline_segment = setup_trampoline() >> 4;
 102 #ifdef CONFIG_SMP
 103         stack_start.sp = temp_stack + sizeof(temp_stack);
 104         early_gdt_descr.address =
 105                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
 106         initial_gs = per_cpu_offset(smp_processor_id());
 107 #endif
 108         initial_code = (unsigned long)wakeup_long64;
 109        saved_magic = 0x123456789abcdef0L;
 110 #endif /* CONFIG_64BIT */
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * acpi_restore_state - undo effects of acpi_save_state_mem
 117  */
 118 void acpi_restore_state_mem(void)
 119 {
 120 }
 121
 122
 123 /**
 124  * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
 125  *
 126  * We allocate a page from the first 1MB of memory for the wakeup
 127  * routine for when we come back from a sleep state. The
 128  * runtime allocator allows specification of <16MB pages, but not
 129  * <1MB pages.
 130  */
 131 void __init acpi_reserve_wakeup_memory(void)
 132 {
 133         unsigned long mem;
 134
 135         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
 136                 printk(KERN_ERR
 137                        "ACPI: Wakeup code way too big, S3 disabled.\n");
 138                 return;
 139         }
 140
 141         mem = find_e820_area(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
 142
 143         if (mem == -1L) {
 144                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
 145                 return;
 146         }
 147         acpi_realmode = (unsigned long) phys_to_virt(mem);
 148         acpi_wakeup_address = mem;
 149         reserve_early(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
 150 }
 151
 152
 153 static int __init acpi_sleep_setup(char *str)
 154 {
 155         while ((str != NULL) && (*str != '\0')) {
 156                 if (strncmp(str, "s3_bios", 7) == 0)
 157                         acpi_realmode_flags |= 1;
 158                 if (strncmp(str, "s3_mode", 7) == 0)
 159                         acpi_realmode_flags |= 2;
 160                 if (strncmp(str, "s3_beep", 7) == 0)
 161                         acpi_realmode_flags |= 4;
 162 #ifdef CONFIG_HIBERNATION
 163                 if (strncmp(str, "s4_nohwsig", 10) == 0)
 164                         acpi_no_s4_hw_signature();
 165                 if (strncmp(str, "s4_nonvs", 8) == 0) {
 166                         pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
 167                                         "please use acpi_sleep=nonvs instead");
 168                         acpi_nvs_nosave();
 169                 }
 170 #endif
 171                 if (strncmp(str, "nonvs", 5) == 0)
 172                         acpi_nvs_nosave();
 173                 if (strncmp(str, "old_ordering", 12) == 0)
 174                         acpi_old_suspend_ordering();
 175                 str = strchr(str, ',');
 176                 if (str != NULL)
 177                         str += strspn(str, ", \t");
 178         }
 179         return 1;
 180 }
 181
 182 __setup("acpi_sleep=", acpi_sleep_setup);