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 #ifdef CONFIG_X86_32 17 #include <asm/pgtable.h> 18 #endif 19 20 #include "realmode/wakeup.h" 21 #include "sleep.h" 22 23 unsigned long acpi_wakeup_address; 24 unsigned long acpi_realmode_flags; 25 26 /* address in low memory of the wakeup routine. */ 27 static unsigned long acpi_realmode; 28 29 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) 30 static char temp_stack[4096]; 31 #endif 32 33 /** 34 * acpi_save_state_mem - save kernel state 35 * 36 * Create an identity mapped page table and copy the wakeup routine to 37 * low memory. 38 * 39 * Note that this is too late to change acpi_wakeup_address. 40 */ 41 int acpi_save_state_mem(void) 42 { 43 struct wakeup_header *header; 44 45 if (!acpi_realmode) { 46 printk(KERN_ERR "Could not allocate memory during boot, " 47 "S3 disabled\n"); 48 return -ENOMEM; 49 } 50 memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE); 51 52 header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); 53 if (header->signature != 0x51ee1111) { 54 printk(KERN_ERR "wakeup header does not match\n"); 55 return -EINVAL; 56 } 57 58 header->video_mode = saved_video_mode; 59 60 header->wakeup_jmp_seg = acpi_wakeup_address >> 4; 61 62 /* 63 * Set up the wakeup GDT. We set these up as Big Real Mode, 64 * that is, with limits set to 4 GB. At least the Lenovo 65 * Thinkpad X61 is known to need this for the video BIOS 66 * initialization quirk to work; this is likely to also 67 * be the case for other laptops or integrated video devices. 68 */ 69 70 /* GDT[0]: GDT self-pointer */ 71 header->wakeup_gdt[0] = 72 (u64)(sizeof(header->wakeup_gdt) - 1) + 73 ((u64)(acpi_wakeup_address + 74 ((char *)&header->wakeup_gdt - (char *)acpi_realmode)) 75 << 16); 76 /* GDT[1]: big real mode-like code segment */ 77 header->wakeup_gdt[1] = 78 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); 79 /* GDT[2]: big real mode-like data segment */ 80 header->wakeup_gdt[2] = 81 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); 82 83 #ifndef CONFIG_64BIT 84 store_gdt((struct desc_ptr *)&header->pmode_gdt); 85 86 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low, 87 &header->pmode_efer_high)) 88 header->pmode_efer_low = header->pmode_efer_high = 0; 89 #endif /* !CONFIG_64BIT */ 90 91 header->pmode_cr0 = read_cr0(); 92 header->pmode_cr4 = read_cr4_safe(); 93 header->realmode_flags = acpi_realmode_flags; 94 header->real_magic = 0x12345678; 95 96 #ifndef CONFIG_64BIT 97 header->pmode_entry = (u32)&wakeup_pmode_return; 98 header->pmode_cr3 = (u32)__pa(&initial_page_table); 99 saved_magic = 0x12345678; 100 #else /* CONFIG_64BIT */ 101 header->trampoline_segment = setup_trampoline() >> 4; 102 #ifdef CONFIG_SMP 103 stack_start.sp = temp_stack + sizeof(temp_stack); 104 early_gdt_descr.address = 105 (unsigned long)get_cpu_gdt_table(smp_processor_id()); 106 initial_gs = per_cpu_offset(smp_processor_id()); 107 #endif 108 initial_code = (unsigned long)wakeup_long64; 109 saved_magic = 0x123456789abcdef0L; 110 #endif /* CONFIG_64BIT */ 111 112 return 0; 113 } 114 115 /* 116 * acpi_restore_state - undo effects of acpi_save_state_mem 117 */ 118 void acpi_restore_state_mem(void) 119 { 120 } 121 122 123 /** 124 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation 125 * 126 * We allocate a page from the first 1MB of memory for the wakeup 127 * routine for when we come back from a sleep state. The 128 * runtime allocator allows specification of <16MB pages, but not 129 * <1MB pages. 130 */ 131 void __init acpi_reserve_wakeup_memory(void) 132 { 133 phys_addr_t mem; 134 135 if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { 136 printk(KERN_ERR 137 "ACPI: Wakeup code way too big, S3 disabled.\n"); 138 return; 139 } 140 141 mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE); 142 143 if (mem == MEMBLOCK_ERROR) { 144 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); 145 return; 146 } 147 acpi_realmode = (unsigned long) phys_to_virt(mem); 148 acpi_wakeup_address = mem; 149 memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP"); 150 } 151 152 153 static int __init acpi_sleep_setup(char *str) 154 { 155 while ((str != NULL) && (*str != '\0')) { 156 if (strncmp(str, "s3_bios", 7) == 0) 157 acpi_realmode_flags |= 1; 158 if (strncmp(str, "s3_mode", 7) == 0) 159 acpi_realmode_flags |= 2; 160 if (strncmp(str, "s3_beep", 7) == 0) 161 acpi_realmode_flags |= 4; 162 #ifdef CONFIG_HIBERNATION 163 if (strncmp(str, "s4_nohwsig", 10) == 0) 164 acpi_no_s4_hw_signature(); 165 if (strncmp(str, "s4_nonvs", 8) == 0) { 166 pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, " 167 "please use acpi_sleep=nonvs instead"); 168 acpi_nvs_nosave(); 169 } 170 #endif 171 if (strncmp(str, "nonvs", 5) == 0) 172 acpi_nvs_nosave(); 173 if (strncmp(str, "old_ordering", 12) == 0) 174 acpi_old_suspend_ordering(); 175 str = strchr(str, ','); 176 if (str != NULL) 177 str += strspn(str, ", \t"); 178 } 179 return 1; 180 } 181 182 __setup("acpi_sleep=", acpi_sleep_setup); 183