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@ucw.cz> 6 */ 7 8 #include <linux/acpi.h> 9 #include <linux/bootmem.h> 10 #include <linux/memblock.h> 11 #include <linux/dmi.h> 12 #include <linux/cpumask.h> 13 #include <asm/segment.h> 14 #include <asm/desc.h> 15 #include <asm/pgtable.h> 16 #include <asm/cacheflush.h> 17 #include <asm/realmode.h> 18 19 #include "../../realmode/rm/wakeup.h" 20 #include "sleep.h" 21 22 unsigned long acpi_realmode_flags; 23 24 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) 25 static char temp_stack[4096]; 26 #endif 27 28 asmlinkage void acpi_enter_s3(void) 29 { 30 acpi_enter_sleep_state(3, wake_sleep_flags); 31 } 32 /** 33 * acpi_suspend_lowlevel - save kernel state 34 * 35 * Create an identity mapped page table and copy the wakeup routine to 36 * low memory. 37 */ 38 int acpi_suspend_lowlevel(void) 39 { 40 struct wakeup_header *header = 41 (struct wakeup_header *) __va(real_mode_header->wakeup_header); 42 43 if (header->signature != WAKEUP_HEADER_SIGNATURE) { 44 printk(KERN_ERR "wakeup header does not match\n"); 45 return -EINVAL; 46 } 47 48 header->video_mode = saved_video_mode; 49 50 #ifndef CONFIG_64BIT 51 store_gdt((struct desc_ptr *)&header->pmode_gdt); 52 53 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low, 54 &header->pmode_efer_high)) 55 header->pmode_efer_low = header->pmode_efer_high = 0; 56 #endif /* !CONFIG_64BIT */ 57 58 header->pmode_cr0 = read_cr0(); 59 header->pmode_cr4 = read_cr4_safe(); 60 header->pmode_behavior = 0; 61 if (!rdmsr_safe(MSR_IA32_MISC_ENABLE, 62 &header->pmode_misc_en_low, 63 &header->pmode_misc_en_high)) 64 header->pmode_behavior |= 65 (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE); 66 header->realmode_flags = acpi_realmode_flags; 67 header->real_magic = 0x12345678; 68 69 #ifndef CONFIG_64BIT 70 header->pmode_entry = (u32)&wakeup_pmode_return; 71 header->pmode_cr3 = (u32)__pa(&initial_page_table); 72 saved_magic = 0x12345678; 73 #else /* CONFIG_64BIT */ 74 #ifdef CONFIG_SMP 75 stack_start = (unsigned long)temp_stack + sizeof(temp_stack); 76 early_gdt_descr.address = 77 (unsigned long)get_cpu_gdt_table(smp_processor_id()); 78 initial_gs = per_cpu_offset(smp_processor_id()); 79 #endif 80 initial_code = (unsigned long)wakeup_long64; 81 saved_magic = 0x123456789abcdef0L; 82 #endif /* CONFIG_64BIT */ 83 84 do_suspend_lowlevel(); 85 return 0; 86 } 87 88 static int __init acpi_sleep_setup(char *str) 89 { 90 while ((str != NULL) && (*str != '\0')) { 91 if (strncmp(str, "s3_bios", 7) == 0) 92 acpi_realmode_flags |= 1; 93 if (strncmp(str, "s3_mode", 7) == 0) 94 acpi_realmode_flags |= 2; 95 if (strncmp(str, "s3_beep", 7) == 0) 96 acpi_realmode_flags |= 4; 97 #ifdef CONFIG_HIBERNATION 98 if (strncmp(str, "s4_nohwsig", 10) == 0) 99 acpi_no_s4_hw_signature(); 100 #endif 101 if (strncmp(str, "nonvs", 5) == 0) 102 acpi_nvs_nosave(); 103 if (strncmp(str, "old_ordering", 12) == 0) 104 acpi_old_suspend_ordering(); 105 str = strchr(str, ','); 106 if (str != NULL) 107 str += strspn(str, ", \t"); 108 } 109 return 1; 110 } 111 112 __setup("acpi_sleep=", acpi_sleep_setup); 113