Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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/config.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/types.h> |
| 33 | #include <linux/stddef.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/pci.h> |
| 36 | #include <linux/bootmem.h> |
| 37 | #include <linux/irq.h> |
| 38 | #include <linux/acpi.h> |
| 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 | /* -------------------------------------------------------------------------- |
| 52 | Low-Level Sleep Support |
| 53 | -------------------------------------------------------------------------- */ |
| 54 | |
| 55 | #ifdef CONFIG_ACPI_SLEEP |
| 56 | |
| 57 | /* address in low memory of the wakeup routine. */ |
| 58 | unsigned long acpi_wakeup_address = 0; |
| 59 | unsigned long acpi_video_flags; |
| 60 | extern char wakeup_start, wakeup_end; |
| 61 | |
| 62 | extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long)); |
| 63 | |
| 64 | static pgd_t low_ptr; |
| 65 | |
| 66 | static void init_low_mapping(void) |
| 67 | { |
| 68 | pgd_t *slot0 = pgd_offset(current->mm, 0UL); |
| 69 | low_ptr = *slot0; |
| 70 | set_pgd(slot0, *pgd_offset(current->mm, PAGE_OFFSET)); |
| 71 | flush_tlb_all(); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * acpi_save_state_mem - save kernel state |
| 76 | * |
| 77 | * Create an identity mapped page table and copy the wakeup routine to |
| 78 | * low memory. |
| 79 | */ |
| 80 | int acpi_save_state_mem (void) |
| 81 | { |
| 82 | init_low_mapping(); |
| 83 | |
| 84 | memcpy((void *) acpi_wakeup_address, &wakeup_start, &wakeup_end - &wakeup_start); |
| 85 | acpi_copy_wakeup_routine(acpi_wakeup_address); |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * acpi_restore_state |
| 92 | */ |
| 93 | void acpi_restore_state_mem (void) |
| 94 | { |
| 95 | set_pgd(pgd_offset(current->mm, 0UL), low_ptr); |
| 96 | flush_tlb_all(); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * acpi_reserve_bootmem - do _very_ early ACPI initialisation |
| 101 | * |
| 102 | * We allocate a page in low memory for the wakeup |
| 103 | * routine for when we come back from a sleep state. The |
| 104 | * runtime allocator allows specification of <16M pages, but not |
| 105 | * <1M pages. |
| 106 | */ |
| 107 | void __init acpi_reserve_bootmem(void) |
| 108 | { |
| 109 | acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE); |
| 110 | if ((&wakeup_end - &wakeup_start) > PAGE_SIZE) |
| 111 | printk(KERN_CRIT "ACPI: Wakeup code way too big, will crash on attempt to suspend\n"); |
| 112 | } |
| 113 | |
| 114 | static int __init acpi_sleep_setup(char *str) |
| 115 | { |
| 116 | while ((str != NULL) && (*str != '\0')) { |
| 117 | if (strncmp(str, "s3_bios", 7) == 0) |
| 118 | acpi_video_flags = 1; |
| 119 | if (strncmp(str, "s3_mode", 7) == 0) |
| 120 | acpi_video_flags |= 2; |
| 121 | str = strchr(str, ','); |
| 122 | if (str != NULL) |
| 123 | str += strspn(str, ", \t"); |
| 124 | } |
| 125 | return 1; |
| 126 | } |
| 127 | |
| 128 | __setup("acpi_sleep=", acpi_sleep_setup); |
| 129 | |
| 130 | #endif /*CONFIG_ACPI_SLEEP*/ |
| 131 | |
| 132 | void acpi_pci_link_exit(void) {} |