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/*
* acpi.c - Architecture-Specific Low-Level ACPI Support
*
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2001 Jun Nakajima <jun.nakajima@intel.com>
* Copyright (C) 2001 Patrick Mochel <mochel@osdl.org>
* Copyright (C) 2002 Andi Kleen, SuSE Labs (x86-64 port)
* Copyright (C) 2003 Pavel Machek, SuSE Labs
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/bootmem.h>
#include <linux/acpi.h>
#include <linux/cpumask.h>
#include <asm/mpspec.h>
#include <asm/io.h>
#include <asm/apic.h>
#include <asm/apicdef.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/io_apic.h>
#include <asm/proto.h>
#include <asm/tlbflush.h>
/* --------------------------------------------------------------------------
Low-Level Sleep Support
-------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_SLEEP
/* address in low memory of the wakeup routine. */
unsigned long acpi_wakeup_address = 0;
unsigned long acpi_video_flags;
extern char wakeup_start, wakeup_end;
extern unsigned long acpi_copy_wakeup_routine(unsigned long);
static pgd_t low_ptr;
static void init_low_mapping(void)
{
pgd_t *slot0 = pgd_offset(current->mm, 0UL);
low_ptr = *slot0;
/* FIXME: We're playing with the current task's page tables here, which
* is potentially dangerous on SMP systems.
*/
set_pgd(slot0, *pgd_offset(current->mm, PAGE_OFFSET));
local_flush_tlb();
}
/**
* acpi_save_state_mem - save kernel state
*
* Create an identity mapped page table and copy the wakeup routine to
* low memory.
*/
int acpi_save_state_mem(void)
{
init_low_mapping();
memcpy((void *)acpi_wakeup_address, &wakeup_start,
&wakeup_end - &wakeup_start);
acpi_copy_wakeup_routine(acpi_wakeup_address);
return 0;
}
/*
* acpi_restore_state
*/
void acpi_restore_state_mem(void)
{
set_pgd(pgd_offset(current->mm, 0UL), low_ptr);
local_flush_tlb();
}
/**
* acpi_reserve_bootmem - do _very_ early ACPI initialisation
*
* We allocate a page in low memory for the wakeup
* routine for when we come back from a sleep state. The
* runtime allocator allows specification of <16M pages, but not
* <1M pages.
*/
void __init acpi_reserve_bootmem(void)
{
acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
if ((&wakeup_end - &wakeup_start) > PAGE_SIZE)
printk(KERN_CRIT
"ACPI: Wakeup code way too big, will crash on attempt to suspend\n");
}
static int __init acpi_sleep_setup(char *str)
{
while ((str != NULL) && (*str != '\0')) {
if (strncmp(str, "s3_bios", 7) == 0)
acpi_video_flags = 1;
if (strncmp(str, "s3_mode", 7) == 0)
acpi_video_flags |= 2;
str = strchr(str, ',');
if (str != NULL)
str += strspn(str, ", \t");
}
return 1;
}
__setup("acpi_sleep=", acpi_sleep_setup);
#endif /*CONFIG_ACPI_SLEEP */
void acpi_pci_link_exit(void)
{
}
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