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 16 #include "realmode/wakeup.h" 17 #include "sleep.h" 18 19 unsigned long acpi_wakeup_address; 20 unsigned long acpi_realmode_flags; 21 22 /* address in low memory of the wakeup routine. */ 23 static unsigned long acpi_realmode; 24 25 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) 26 static char temp_stack[4096]; 27 #endif 28 29 /** 30 * acpi_save_state_mem - save kernel state 31 * 32 * Create an identity mapped page table and copy the wakeup routine to 33 * low memory. 34 * 35 * Note that this is too late to change acpi_wakeup_address. 36 */ 37 int acpi_save_state_mem(void) 38 { 39 struct wakeup_header *header; 40 41 if (!acpi_realmode) { 42 printk(KERN_ERR "Could not allocate memory during boot, " 43 "S3 disabled\n"); 44 return -ENOMEM; 45 } 46 memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE); 47 48 header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); 49 if (header->signature != 0x51ee1111) { 50 printk(KERN_ERR "wakeup header does not match\n"); 51 return -EINVAL; 52 } 53 54 header->video_mode = saved_video_mode; 55 56 header->wakeup_jmp_seg = acpi_wakeup_address >> 4; 57 58 /* 59 * Set up the wakeup GDT. We set these up as Big Real Mode, 60 * that is, with limits set to 4 GB. At least the Lenovo 61 * Thinkpad X61 is known to need this for the video BIOS 62 * initialization quirk to work; this is likely to also 63 * be the case for other laptops or integrated video devices. 64 */ 65 66 /* GDT[0]: GDT self-pointer */ 67 header->wakeup_gdt[0] = 68 (u64)(sizeof(header->wakeup_gdt) - 1) + 69 ((u64)(acpi_wakeup_address + 70 ((char *)&header->wakeup_gdt - (char *)acpi_realmode)) 71 << 16); 72 /* GDT[1]: big real mode-like code segment */ 73 header->wakeup_gdt[1] = 74 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); 75 /* GDT[2]: big real mode-like data segment */ 76 header->wakeup_gdt[2] = 77 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); 78 79 #ifndef CONFIG_64BIT 80 store_gdt((struct desc_ptr *)&header->pmode_gdt); 81 82 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low, 83 &header->pmode_efer_high)) 84 header->pmode_efer_low = header->pmode_efer_high = 0; 85 #endif /* !CONFIG_64BIT */ 86 87 header->pmode_cr0 = read_cr0(); 88 header->pmode_cr4 = read_cr4_safe(); 89 header->realmode_flags = acpi_realmode_flags; 90 header->real_magic = 0x12345678; 91 92 #ifndef CONFIG_64BIT 93 header->pmode_entry = (u32)&wakeup_pmode_return; 94 header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET); 95 saved_magic = 0x12345678; 96 #else /* CONFIG_64BIT */ 97 header->trampoline_segment = setup_trampoline() >> 4; 98 #ifdef CONFIG_SMP 99 stack_start.sp = temp_stack + sizeof(temp_stack); 100 early_gdt_descr.address = 101 (unsigned long)get_cpu_gdt_table(smp_processor_id()); 102 initial_gs = per_cpu_offset(smp_processor_id()); 103 #endif 104 initial_code = (unsigned long)wakeup_long64; 105 saved_magic = 0x123456789abcdef0L; 106 #endif /* CONFIG_64BIT */ 107 108 return 0; 109 } 110 111 /* 112 * acpi_restore_state - undo effects of acpi_save_state_mem 113 */ 114 void acpi_restore_state_mem(void) 115 { 116 } 117 118 119 /** 120 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation 121 * 122 * We allocate a page from the first 1MB of memory for the wakeup 123 * routine for when we come back from a sleep state. The 124 * runtime allocator allows specification of <16MB pages, but not 125 * <1MB pages. 126 */ 127 void __init acpi_reserve_wakeup_memory(void) 128 { 129 phys_addr_t mem; 130 131 if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { 132 printk(KERN_ERR 133 "ACPI: Wakeup code way too big, S3 disabled.\n"); 134 return; 135 } 136 137 mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE); 138 139 if (mem == MEMBLOCK_ERROR) { 140 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); 141 return; 142 } 143 acpi_realmode = (unsigned long) phys_to_virt(mem); 144 acpi_wakeup_address = mem; 145 memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP"); 146 } 147 148 149 static int __init acpi_sleep_setup(char *str) 150 { 151 while ((str != NULL) && (*str != '\0')) { 152 if (strncmp(str, "s3_bios", 7) == 0) 153 acpi_realmode_flags |= 1; 154 if (strncmp(str, "s3_mode", 7) == 0) 155 acpi_realmode_flags |= 2; 156 if (strncmp(str, "s3_beep", 7) == 0) 157 acpi_realmode_flags |= 4; 158 #ifdef CONFIG_HIBERNATION 159 if (strncmp(str, "s4_nohwsig", 10) == 0) 160 acpi_no_s4_hw_signature(); 161 if (strncmp(str, "s4_nonvs", 8) == 0) { 162 pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, " 163 "please use acpi_sleep=nonvs instead"); 164 acpi_nvs_nosave(); 165 } 166 #endif 167 if (strncmp(str, "nonvs", 5) == 0) 168 acpi_nvs_nosave(); 169 if (strncmp(str, "old_ordering", 12) == 0) 170 acpi_old_suspend_ordering(); 171 str = strchr(str, ','); 172 if (str != NULL) 173 str += strspn(str, ", \t"); 174 } 175 return 1; 176 } 177 178 __setup("acpi_sleep=", acpi_sleep_setup); 179