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