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#ifdef CONFIG_ACPI_SLEEP 55 56/* address in low memory of the wakeup routine. */ 57unsigned long acpi_wakeup_address = 0; 58unsigned long acpi_video_flags; 59extern char wakeup_start, wakeup_end; 60 61extern unsigned long acpi_copy_wakeup_routine(unsigned long); 62 63/** 64 * acpi_save_state_mem - save kernel state 65 * 66 * Create an identity mapped page table and copy the wakeup routine to 67 * low memory. 68 */ 69int acpi_save_state_mem(void) 70{ 71 memcpy((void *)acpi_wakeup_address, &wakeup_start, 72 &wakeup_end - &wakeup_start); 73 acpi_copy_wakeup_routine(acpi_wakeup_address); 74 75 return 0; 76} 77 78/* 79 * acpi_restore_state 80 */ 81void acpi_restore_state_mem(void) 82{ 83} 84 85/** 86 * acpi_reserve_bootmem - do _very_ early ACPI initialisation 87 * 88 * We allocate a page in low memory for the wakeup 89 * routine for when we come back from a sleep state. The 90 * runtime allocator allows specification of <16M pages, but not 91 * <1M pages. 92 */ 93void __init acpi_reserve_bootmem(void) 94{ 95 acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE*2); 96 if ((&wakeup_end - &wakeup_start) > (PAGE_SIZE*2)) 97 printk(KERN_CRIT 98 "ACPI: Wakeup code way too big, will crash on attempt" 99 " to suspend\n"); 100} 101 102static int __init acpi_sleep_setup(char *str) 103{ 104 while ((str != NULL) && (*str != '\0')) { 105 if (strncmp(str, "s3_bios", 7) == 0) 106 acpi_video_flags = 1; 107 if (strncmp(str, "s3_mode", 7) == 0) 108 acpi_video_flags |= 2; 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#endif /*CONFIG_ACPI_SLEEP */ 119 120void acpi_pci_link_exit(void) 121{ 122} 123