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_wakeup_address;
  22 unsigned long acpi_realmode_flags;
  23
  24 /* address in low memory of the wakeup routine. */
  25 static unsigned long acpi_realmode;
  26
  27 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
  28 static char temp_stack[4096];
  29 #endif
  30
  31 /**
  32  * acpi_suspend_lowlevel - save kernel state
  33  *
  34  * Create an identity mapped page table and copy the wakeup routine to
  35  * low memory.
  36  *
  37  * Note that this is too late to change acpi_wakeup_address.
  38  */
  39 int acpi_suspend_lowlevel(void)
  40 {
  41         struct wakeup_header *header;
  42
  43         if (!acpi_realmode) {
  44                 printk(KERN_ERR "Could not allocate memory during boot, "
  45                        "S3 disabled\n");
  46                 return -ENOMEM;
  47         }
  48         memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
  49
  50         header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
  51         if (header->signature != 0x51ee1111) {
  52                 printk(KERN_ERR "wakeup header does not match\n");
  53                 return -EINVAL;
  54         }
  55
  56         header->video_mode = saved_video_mode;
  57
  58         header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
  59
  60         /*
  61          * Set up the wakeup GDT.  We set these up as Big Real Mode,
  62          * that is, with limits set to 4 GB.  At least the Lenovo
  63          * Thinkpad X61 is known to need this for the video BIOS
  64          * initialization quirk to work; this is likely to also
  65          * be the case for other laptops or integrated video devices.
  66          */
  67
  68         /* GDT[0]: GDT self-pointer */
  69         header->wakeup_gdt[0] =
  70                 (u64)(sizeof(header->wakeup_gdt) - 1) +
  71                 ((u64)(acpi_wakeup_address +
  72                         ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
  73                                 << 16);
  74         /* GDT[1]: big real mode-like code segment */
  75         header->wakeup_gdt[1] =
  76                 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
  77         /* GDT[2]: big real mode-like data segment */
  78         header->wakeup_gdt[2] =
  79                 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
  80
  81 #ifndef CONFIG_64BIT
  82         store_gdt((struct desc_ptr *)&header->pmode_gdt);
  83
  84         if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
  85                        &header->pmode_efer_high))
  86                 header->pmode_efer_low = header->pmode_efer_high = 0;
  87 #endif /* !CONFIG_64BIT */
  88
  89         header->pmode_cr0 = read_cr0();
  90         header->pmode_cr4 = read_cr4_safe();
  91         header->realmode_flags = acpi_realmode_flags;
  92         header->real_magic = 0x12345678;
  93
  94 #ifndef CONFIG_64BIT
  95         header->pmode_entry = (u32)&wakeup_pmode_return;
  96         header->pmode_cr3 = (u32)__pa(&initial_page_table);
  97         saved_magic = 0x12345678;
  98 #else /* CONFIG_64BIT */
  99         header->trampoline_segment = setup_trampoline() >> 4;
 100 #ifdef CONFIG_SMP
 101         stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
 102         early_gdt_descr.address =
 103                         (unsigned long)get_cpu_gdt_table(smp_processor_id());
 104         initial_gs = per_cpu_offset(smp_processor_id());
 105 #endif
 106         initial_code = (unsigned long)wakeup_long64;
 107        saved_magic = 0x123456789abcdef0L;
 108 #endif /* CONFIG_64BIT */
 109
 110         do_suspend_lowlevel();
 111         return 0;
 112 }
 113
 114 /**
 115  * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
 116  *
 117  * We allocate a page from the first 1MB of memory for the wakeup
 118  * routine for when we come back from a sleep state. The
 119  * runtime allocator allows specification of <16MB pages, but not
 120  * <1MB pages.
 121  */
 122 void __init acpi_reserve_wakeup_memory(void)
 123 {
 124         phys_addr_t mem;
 125
 126         if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
 127                 printk(KERN_ERR
 128                        "ACPI: Wakeup code way too big, S3 disabled.\n");
 129                 return;
 130         }
 131
 132         mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
 133
 134         if (mem == MEMBLOCK_ERROR) {
 135                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
 136                 return;
 137         }
 138         acpi_realmode = (unsigned long) phys_to_virt(mem);
 139         acpi_wakeup_address = mem;
 140         memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
 141 }
 142
 143 int __init acpi_configure_wakeup_memory(void)
 144 {
 145         if (acpi_realmode)
 146                 set_memory_x(acpi_realmode, WAKEUP_SIZE >> PAGE_SHIFT);
 147
 148         return 0;
 149 }
 150 arch_initcall(acpi_configure_wakeup_memory);
 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);