arch/x86_64/kernel/acpi/sleep.c

   1 /*
   2  *  acpi.c - Architecture-Specific Low-Level ACPI Support
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *  Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
   6  *  Copyright (C) 2001 Patrick Mochel <mochel@osdl.org>
   7  *  Copyright (C) 2002 Andi Kleen, SuSE Labs (x86-64 port)
   8  *  Copyright (C) 2003 Pavel Machek, SuSE Labs
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/init.h>
  31 #include <linux/types.h>
  32 #include <linux/stddef.h>
  33 #include <linux/slab.h>
  34 #include <linux/pci.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/acpi.h>
  37 #include <linux/cpumask.h>
  38
  39 #include <asm/mpspec.h>
  40 #include <asm/io.h>
  41 #include <asm/apic.h>
  42 #include <asm/apicdef.h>
  43 #include <asm/page.h>
  44 #include <asm/pgtable.h>
  45 #include <asm/pgalloc.h>
  46 #include <asm/io_apic.h>
  47 #include <asm/proto.h>
  48 #include <asm/tlbflush.h>
  49
  50 /* --------------------------------------------------------------------------
  51                               Low-Level Sleep Support
  52    -------------------------------------------------------------------------- */
  53
  54 /* address in low memory of the wakeup routine. */
  55 unsigned long acpi_wakeup_address = 0;
  56 unsigned long acpi_realmode_flags;
  57 extern char wakeup_start, wakeup_end;
  58
  59 extern unsigned long acpi_copy_wakeup_routine(unsigned long);
  60
  61 /**
  62  * acpi_save_state_mem - save kernel state
  63  *
  64  * Create an identity mapped page table and copy the wakeup routine to
  65  * low memory.
  66  */
  67 int acpi_save_state_mem(void)
  68 {
  69         memcpy((void *)acpi_wakeup_address, &wakeup_start,
  70                &wakeup_end - &wakeup_start);
  71         acpi_copy_wakeup_routine(acpi_wakeup_address);
  72
  73         return 0;
  74 }
  75
  76 /*
  77  * acpi_restore_state
  78  */
  79 void acpi_restore_state_mem(void)
  80 {
  81 }
  82
  83 /**
  84  * acpi_reserve_bootmem - do _very_ early ACPI initialisation
  85  *
  86  * We allocate a page in low memory for the wakeup
  87  * routine for when we come back from a sleep state. The
  88  * runtime allocator allows specification of <16M pages, but not
  89  * <1M pages.
  90  */
  91 void __init acpi_reserve_bootmem(void)
  92 {
  93         acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
  94         if ((&wakeup_end - &wakeup_start) > (PAGE_SIZE*2))
  95                 printk(KERN_CRIT
  96                        "ACPI: Wakeup code way too big, will crash on attempt"
  97                        " to suspend\n");
  98 }
  99
 100 static int __init acpi_sleep_setup(char *str)
 101 {
 102         while ((str != NULL) && (*str != '\0')) {
 103                 if (strncmp(str, "s3_bios", 7) == 0)
 104                         acpi_realmode_flags |= 1;
 105                 if (strncmp(str, "s3_mode", 7) == 0)
 106                         acpi_realmode_flags |= 2;
 107                 if (strncmp(str, "s3_beep", 7) == 0)
 108                         acpi_realmode_flags |= 4;
 109                 str = strchr(str, ',');
 110                 if (str != NULL)
 111                         str += strspn(str, ", \t");
 112         }
 113         return 1;
 114 }
 115
 116 __setup("acpi_sleep=", acpi_sleep_setup);
 117
 118 void acpi_pci_link_exit(void)
 119 {
 120 }