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