arch/x86/kernel/acpi/sleep-xen.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@suse.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 #ifndef CONFIG_ACPI_PV_SLEEP
  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 #endif
  29
  30 /**
  31  * acpi_save_state_mem - save kernel state
  32  *
  33  * Create an identity mapped page table and copy the wakeup routine to
  34  * low memory.
  35  *
  36  * Note that this is too late to change acpi_wakeup_address.
  37  */
  38 int acpi_save_state_mem(void)
  39 {
  40 #ifndef CONFIG_ACPI_PV_SLEEP
  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         header->pmode_efer_low = nx_enabled;
  85         if (header->pmode_efer_low & 1) {
  86                 /* This is strange, why not save efer, always? */
  87                 rdmsr(MSR_EFER, header->pmode_efer_low,
  88                         header->pmode_efer_high);
  89         }
  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)(swsusp_pg_dir - __PAGE_OFFSET);
 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 #endif
 113
 114         return 0;
 115 }
 116
 117 /*
 118  * acpi_restore_state - undo effects of acpi_save_state_mem
 119  */
 120 void acpi_restore_state_mem(void)
 121 {
 122 }
 123
 124
 125 /**
 126  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
 127  *
 128  * We allocate a page from the first 1MB of memory for the wakeup
 129  * routine for when we come back from a sleep state. The
 130  * runtime allocator allows specification of <16MB pages, but not
 131  * <1MB pages.
 132  */
 133 void __init acpi_reserve_bootmem(void)
 134 {
 135 #ifndef CONFIG_ACPI_PV_SLEEP
 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         acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE);
 143
 144         if (!acpi_realmode) {
 145                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
 146                 return;
 147         }
 148
 149         acpi_wakeup_address = virt_to_phys((void *)acpi_realmode);
 150 #endif
 151 }
 152
 153
 154 #ifndef CONFIG_ACPI_PV_SLEEP
 155 static int __init acpi_sleep_setup(char *str)
 156 {
 157         while ((str != NULL) && (*str != '\0')) {
 158                 if (strncmp(str, "s3_bios", 7) == 0)
 159                         acpi_realmode_flags |= 1;
 160                 if (strncmp(str, "s3_mode", 7) == 0)
 161                         acpi_realmode_flags |= 2;
 162                 if (strncmp(str, "s3_beep", 7) == 0)
 163                         acpi_realmode_flags |= 4;
 164 #ifdef CONFIG_HIBERNATION
 165                 if (strncmp(str, "s4_nohwsig", 10) == 0)
 166                         acpi_no_s4_hw_signature();
 167                 if (strncmp(str, "s4_nonvs", 8) == 0)
 168                         acpi_s4_no_nvs();
 169 #endif
 170                 if (strncmp(str, "old_ordering", 12) == 0)
 171                         acpi_old_suspend_ordering();
 172                 str = strchr(str, ',');
 173                 if (str != NULL)
 174                         str += strspn(str, ", \t");
 175         }
 176         return 1;
 177 }
 178
 179 __setup("acpi_sleep=", acpi_sleep_setup);
 180 #endif /* CONFIG_ACPI_PV_SLEEP */