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 18 #include "realmode/wakeup.h" 19 #include "sleep.h" 20 21 unsigned long acpi_realmode_flags; 22 23 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) 24 static char temp_stack[4096]; 25 #endif 26 27 asmlinkage void acpi_enter_s3(void) 28 { 29 acpi_enter_sleep_state(3, wake_sleep_flags); 30 } 31 /** 32 * acpi_suspend_lowlevel - save kernel state 33 * 34 * Create an identity mapped page table and copy the wakeup routine to 35 * low memory. 36 */ 37 int acpi_suspend_lowlevel(void) 38 { 39 struct wakeup_header *header; 40 /* address in low memory of the wakeup routine. */ 41 char *acpi_realmode; 42 43 acpi_realmode = TRAMPOLINE_SYM(acpi_wakeup_code); 44 45 header = (struct wakeup_header *)(acpi_realmode + WAKEUP_HEADER_OFFSET); 46 if (header->signature != WAKEUP_HEADER_SIGNATURE) { 47 printk(KERN_ERR "wakeup header does not match\n"); 48 return -EINVAL; 49 } 50 51 header->video_mode = saved_video_mode; 52 53 header->wakeup_jmp_seg = acpi_wakeup_address >> 4; 54 55 /* 56 * Set up the wakeup GDT. We set these up as Big Real Mode, 57 * that is, with limits set to 4 GB. At least the Lenovo 58 * Thinkpad X61 is known to need this for the video BIOS 59 * initialization quirk to work; this is likely to also 60 * be the case for other laptops or integrated video devices. 61 */ 62 63 /* GDT[0]: GDT self-pointer */ 64 header->wakeup_gdt[0] = 65 (u64)(sizeof(header->wakeup_gdt) - 1) + 66 ((u64)__pa(&header->wakeup_gdt) << 16); 67 /* GDT[1]: big real mode-like code segment */ 68 header->wakeup_gdt[1] = 69 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); 70 /* GDT[2]: big real mode-like data segment */ 71 header->wakeup_gdt[2] = 72 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); 73 74 #ifndef CONFIG_64BIT 75 store_gdt((struct desc_ptr *)&header->pmode_gdt); 76 77 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low, 78 &header->pmode_efer_high)) 79 header->pmode_efer_low = header->pmode_efer_high = 0; 80 #endif /* !CONFIG_64BIT */ 81 82 header->pmode_cr0 = read_cr0(); 83 header->pmode_cr4 = read_cr4_safe(); 84 header->pmode_behavior = 0; 85 if (!rdmsr_safe(MSR_IA32_MISC_ENABLE, 86 &header->pmode_misc_en_low, 87 &header->pmode_misc_en_high)) 88 header->pmode_behavior |= 89 (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE); 90 header->realmode_flags = acpi_realmode_flags; 91 header->real_magic = 0x12345678; 92 93 #ifndef CONFIG_64BIT 94 header->pmode_entry = (u32)&wakeup_pmode_return; 95 header->pmode_cr3 = (u32)__pa(&initial_page_table); 96 saved_magic = 0x12345678; 97 #else /* CONFIG_64BIT */ 98 header->trampoline_segment = trampoline_address() >> 4; 99 #ifdef CONFIG_SMP 100 stack_start = (unsigned long)temp_stack + sizeof(temp_stack); 101 early_gdt_descr.address = 102 (unsigned long)get_cpu_gdt_table(smp_processor_id()); 103 initial_gs = per_cpu_offset(smp_processor_id()); 104 #endif 105 initial_code = (unsigned long)wakeup_long64; 106 saved_magic = 0x123456789abcdef0L; 107 #endif /* CONFIG_64BIT */ 108 109 do_suspend_lowlevel(); 110 return 0; 111 } 112 113 static int __init acpi_sleep_setup(char *str) 114 { 115 while ((str != NULL) && (*str != '\0')) { 116 if (strncmp(str, "s3_bios", 7) == 0) 117 acpi_realmode_flags |= 1; 118 if (strncmp(str, "s3_mode", 7) == 0) 119 acpi_realmode_flags |= 2; 120 if (strncmp(str, "s3_beep", 7) == 0) 121 acpi_realmode_flags |= 4; 122 #ifdef CONFIG_HIBERNATION 123 if (strncmp(str, "s4_nohwsig", 10) == 0) 124 acpi_no_s4_hw_signature(); 125 #endif 126 if (strncmp(str, "nonvs", 5) == 0) 127 acpi_nvs_nosave(); 128 if (strncmp(str, "old_ordering", 12) == 0) 129 acpi_old_suspend_ordering(); 130 str = strchr(str, ','); 131 if (str != NULL) 132 str += strspn(str, ", \t"); 133 } 134 return 1; 135 } 136 137 __setup("acpi_sleep=", acpi_sleep_setup); 138