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 * x86_acpi_enter_sleep_state - enter sleep state 30 * @state: Sleep state to enter. 31 * 32 * Wrapper around acpi_enter_sleep_state() to be called by assmebly. 33 */ 34 acpi_status asmlinkage __visible x86_acpi_enter_sleep_state(u8 state) 35 { 36 return acpi_enter_sleep_state(state); 37 } 38 39 /** 40 * x86_acpi_suspend_lowlevel - save kernel state 41 * 42 * Create an identity mapped page table and copy the wakeup routine to 43 * low memory. 44 */ 45 int x86_acpi_suspend_lowlevel(void) 46 { 47 struct wakeup_header *header = 48 (struct wakeup_header *) __va(real_mode_header->wakeup_header); 49 50 if (header->signature != WAKEUP_HEADER_SIGNATURE) { 51 printk(KERN_ERR "wakeup header does not match\n"); 52 return -EINVAL; 53 } 54 55 header->video_mode = saved_video_mode; 56 57 header->pmode_behavior = 0; 58 59 #ifndef CONFIG_64BIT 60 native_store_gdt((struct desc_ptr *)&header->pmode_gdt); 61 62 /* 63 * We have to check that we can write back the value, and not 64 * just read it. At least on 90 nm Pentium M (Family 6, Model 65 * 13), reading an invalid MSR is not guaranteed to trap, see 66 * Erratum X4 in "Intel Pentium M Processor on 90 nm Process 67 * with 2-MB L2 Cache and Intel® Processor A100 and A110 on 90 68 * nm process with 512-KB L2 Cache Specification Update". 69 */ 70 if (!rdmsr_safe(MSR_EFER, 71 &header->pmode_efer_low, 72 &header->pmode_efer_high) && 73 !wrmsr_safe(MSR_EFER, 74 header->pmode_efer_low, 75 header->pmode_efer_high)) 76 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER); 77 #endif /* !CONFIG_64BIT */ 78 79 header->pmode_cr0 = read_cr0(); 80 if (__this_cpu_read(cpu_info.cpuid_level) >= 0) { 81 header->pmode_cr4 = read_cr4(); 82 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4); 83 } 84 if (!rdmsr_safe(MSR_IA32_MISC_ENABLE, 85 &header->pmode_misc_en_low, 86 &header->pmode_misc_en_high) && 87 !wrmsr_safe(MSR_IA32_MISC_ENABLE, 88 header->pmode_misc_en_low, 89 header->pmode_misc_en_high)) 90 header->pmode_behavior |= 91 (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE); 92 header->realmode_flags = acpi_realmode_flags; 93 header->real_magic = 0x12345678; 94 95 #ifndef CONFIG_64BIT 96 header->pmode_entry = (u32)&wakeup_pmode_return; 97 header->pmode_cr3 = (u32)__pa_symbol(initial_page_table); 98 saved_magic = 0x12345678; 99 #else /* CONFIG_64BIT */ 100 #ifdef CONFIG_SMP 101 stack_start = (unsigned long)temp_stack + sizeof(temp_stack); 102 early_gdt_descr.address = 103 (unsigned long)get_cpu_gdt_table(smp_processor_id()); 104 initial_gs = per_cpu_offset(smp_processor_id()); 105 #endif 106 initial_code = (unsigned long)wakeup_long64; 107 saved_magic = 0x123456789abcdef0L; 108 #endif /* CONFIG_64BIT */ 109 110 do_suspend_lowlevel(); 111 return 0; 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_realmode_flags |= 1; 119 if (strncmp(str, "s3_mode", 7) == 0) 120 acpi_realmode_flags |= 2; 121 if (strncmp(str, "s3_beep", 7) == 0) 122 acpi_realmode_flags |= 4; 123 #ifdef CONFIG_HIBERNATION 124 if (strncmp(str, "s4_nohwsig", 10) == 0) 125 acpi_no_s4_hw_signature(); 126 #endif 127 if (strncmp(str, "nonvs", 5) == 0) 128 acpi_nvs_nosave(); 129 if (strncmp(str, "nonvs_s3", 8) == 0) 130 acpi_nvs_nosave_s3(); 131 if (strncmp(str, "old_ordering", 12) == 0) 132 acpi_old_suspend_ordering(); 133 str = strchr(str, ','); 134 if (str != NULL) 135 str += strspn(str, ", \t"); 136 } 137 return 1; 138 } 139 140 __setup("acpi_sleep=", acpi_sleep_setup); 141