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 header->pmode_behavior = 0; 47 48 #ifndef CONFIG_64BIT 49 native_store_gdt((struct desc_ptr *)&header->pmode_gdt); 50 51 if (!rdmsr_safe(MSR_EFER, 52 &header->pmode_efer_low, 53 &header->pmode_efer_high)) 54 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER); 55 #endif /* !CONFIG_64BIT */ 56 57 header->pmode_cr0 = read_cr0(); 58 if (__this_cpu_read(cpu_info.cpuid_level) >= 0) { 59 header->pmode_cr4 = read_cr4(); 60 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4); 61 } 62 if (!rdmsr_safe(MSR_IA32_MISC_ENABLE, 63 &header->pmode_misc_en_low, 64 &header->pmode_misc_en_high)) 65 header->pmode_behavior |= 66 (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE); 67 header->realmode_flags = acpi_realmode_flags; 68 header->real_magic = 0x12345678; 69 70 #ifndef CONFIG_64BIT 71 header->pmode_entry = (u32)&wakeup_pmode_return; 72 header->pmode_cr3 = (u32)__pa_symbol(initial_page_table); 73 saved_magic = 0x12345678; 74 #else /* CONFIG_64BIT */ 75 #ifdef CONFIG_SMP 76 stack_start = (unsigned long)temp_stack + sizeof(temp_stack); 77 early_gdt_descr.address = 78 (unsigned long)get_cpu_gdt_table(smp_processor_id()); 79 initial_gs = per_cpu_offset(smp_processor_id()); 80 #endif 81 initial_code = (unsigned long)wakeup_long64; 82 saved_magic = 0x123456789abcdef0L; 83 #endif /* CONFIG_64BIT */ 84 85 do_suspend_lowlevel(); 86 return 0; 87 } 88 89 static int __init acpi_sleep_setup(char *str) 90 { 91 while ((str != NULL) && (*str != '\0')) { 92 if (strncmp(str, "s3_bios", 7) == 0) 93 acpi_realmode_flags |= 1; 94 if (strncmp(str, "s3_mode", 7) == 0) 95 acpi_realmode_flags |= 2; 96 if (strncmp(str, "s3_beep", 7) == 0) 97 acpi_realmode_flags |= 4; 98 #ifdef CONFIG_HIBERNATION 99 if (strncmp(str, "s4_nohwsig", 10) == 0) 100 acpi_no_s4_hw_signature(); 101 #endif 102 if (strncmp(str, "nonvs", 5) == 0) 103 acpi_nvs_nosave(); 104 if (strncmp(str, "nonvs_s3", 8) == 0) 105 acpi_nvs_nosave_s3(); 106 if (strncmp(str, "old_ordering", 12) == 0) 107 acpi_old_suspend_ordering(); 108 str = strchr(str, ','); 109 if (str != NULL) 110 str += strspn(str, ", \t"); 111 } 112 return 1; 113 } 114 115 __setup("acpi_sleep=", acpi_sleep_setup); 116