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