1/* 2 * sleep.c - x86-specific ACPI sleep support. 3 * 4 * Copyright (C) 2001-2003 Patrick Mochel 5 * Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz> 6 */ 7 8#include <linux/acpi.h> 9#include <linux/bootmem.h> 10#include <linux/dmi.h> 11#include <linux/cpumask.h> 12 13#include <asm/smp.h> 14 15/* address in low memory of the wakeup routine. */ 16unsigned long acpi_wakeup_address = 0; 17unsigned long acpi_video_flags; 18extern char wakeup_start, wakeup_end; 19 20extern unsigned long FASTCALL(acpi_copy_wakeup_routine(unsigned long)); 21 22/** 23 * acpi_save_state_mem - save kernel state 24 * 25 * Create an identity mapped page table and copy the wakeup routine to 26 * low memory. 27 */ 28int acpi_save_state_mem(void) 29{ 30 if (!acpi_wakeup_address) 31 return 1; 32 memcpy((void *)acpi_wakeup_address, &wakeup_start, 33 &wakeup_end - &wakeup_start); 34 acpi_copy_wakeup_routine(acpi_wakeup_address); 35 36 return 0; 37} 38 39/* 40 * acpi_restore_state - undo effects of acpi_save_state_mem 41 */ 42void acpi_restore_state_mem(void) 43{ 44} 45 46/** 47 * acpi_reserve_bootmem - do _very_ early ACPI initialisation 48 * 49 * We allocate a page from the first 1MB of memory for the wakeup 50 * routine for when we come back from a sleep state. The 51 * runtime allocator allows specification of <16MB pages, but not 52 * <1MB pages. 53 */ 54void __init acpi_reserve_bootmem(void) 55{ 56 if ((&wakeup_end - &wakeup_start) > PAGE_SIZE) { 57 printk(KERN_ERR 58 "ACPI: Wakeup code way too big, S3 disabled.\n"); 59 return; 60 } 61 62 acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE); 63 if (!acpi_wakeup_address) 64 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); 65} 66 67static int __init acpi_sleep_setup(char *str) 68{ 69 while ((str != NULL) && (*str != '\0')) { 70 if (strncmp(str, "s3_bios", 7) == 0) 71 acpi_video_flags = 1; 72 if (strncmp(str, "s3_mode", 7) == 0) 73 acpi_video_flags |= 2; 74 str = strchr(str, ','); 75 if (str != NULL) 76 str += strspn(str, ", \t"); 77 } 78 return 1; 79} 80 81__setup("acpi_sleep=", acpi_sleep_setup); 82 83static __init int reset_videomode_after_s3(struct dmi_system_id *d) 84{ 85 acpi_video_flags |= 2; 86 return 0; 87} 88 89static __initdata struct dmi_system_id acpisleep_dmi_table[] = { 90 { /* Reset video mode after returning from ACPI S3 sleep */ 91 .callback = reset_videomode_after_s3, 92 .ident = "Toshiba Satellite 4030cdt", 93 .matches = { 94 DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"), 95 }, 96 }, 97 {} 98}; 99 100static int __init acpisleep_dmi_init(void) 101{ 102 dmi_check_system(acpisleep_dmi_table); 103 return 0; 104} 105 106core_initcall(acpisleep_dmi_init); 107