arch/i386/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@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
  13 #include <asm/smp.h>
  14
  15 /* address in low memory of the wakeup routine. */
  16 unsigned long acpi_wakeup_address = 0;
  17 unsigned long acpi_video_flags;
  18 extern char wakeup_start, wakeup_end;
  19
  20 extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long));
  21
  22 /**
  23  * acpi_save_state_mem - save kernel state
  24  *
  25  * Create an identity mapped page table and copy the wakeup routine to
  26  * low memory.
  27  */
  28 int acpi_save_state_mem(void)
  29 {
  30         if (!acpi_wakeup_address)
  31                 return 1;
  32         memcpy((void *)acpi_wakeup_address, &wakeup_start,
  33                &wakeup_end - &wakeup_start);
  34         acpi_copy_wakeup_routine(acpi_wakeup_address);
  35
  36         return 0;
  37 }
  38
  39 /*
  40  * acpi_restore_state - undo effects of acpi_save_state_mem
  41  */
  42 void acpi_restore_state_mem(void)
  43 {
  44 }
  45
  46 /**
  47  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
  48  *
  49  * We allocate a page from the first 1MB of memory for the wakeup
  50  * routine for when we come back from a sleep state. The
  51  * runtime allocator allows specification of <16MB pages, but not
  52  * <1MB pages.
  53  */
  54 void __init acpi_reserve_bootmem(void)
  55 {
  56         if ((&wakeup_end - &wakeup_start) > PAGE_SIZE) {
  57                 printk(KERN_ERR
  58                        "ACPI: Wakeup code way too big, S3 disabled.\n");
  59                 return;
  60         }
  61
  62         acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
  63         if (!acpi_wakeup_address)
  64                 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
  65 }
  66
  67 static int __init acpi_sleep_setup(char *str)
  68 {
  69         while ((str != NULL) && (*str != '\0')) {
  70                 if (strncmp(str, "s3_bios", 7) == 0)
  71                         acpi_video_flags = 1;
  72                 if (strncmp(str, "s3_mode", 7) == 0)
  73                         acpi_video_flags |= 2;
  74                 str = strchr(str, ',');
  75                 if (str != NULL)
  76                         str += strspn(str, ", \t");
  77         }
  78         return 1;
  79 }
  80
  81 __setup("acpi_sleep=", acpi_sleep_setup);
  82
  83 static __init int reset_videomode_after_s3(struct dmi_system_id *d)
  84 {
  85         acpi_video_flags |= 2;
  86         return 0;
  87 }
  88
  89 static __initdata struct dmi_system_id acpisleep_dmi_table[] = {
  90         {                       /* Reset video mode after returning from ACPI S3 sleep */
  91          .callback = reset_videomode_after_s3,
  92          .ident = "Toshiba Satellite 4030cdt",
  93          .matches = {
  94                      DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),
  95                      },
  96          },
  97         {}
  98 };
  99
 100 static int __init acpisleep_dmi_init(void)
 101 {
 102         dmi_check_system(acpisleep_dmi_table);
 103         return 0;
 104 }
 105
 106 core_initcall(acpisleep_dmi_init);