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@suse.cz> 6 */ 7 8 #include <linux/acpi.h> 9 #include <linux/bootmem.h> 10 #include <linux/dmi.h> 11 #include <linux/cpumask.h> 12 #include <asm/segment.h> 13 #include <asm/desc.h> 14 15 #include "realmode/wakeup.h" 16 #include "sleep.h" 17 18 unsigned long acpi_wakeup_address; 19 unsigned long acpi_realmode_flags; 20 21 /* address in low memory of the wakeup routine. */ 22 static unsigned long acpi_realmode; 23 24 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) 25 static char temp_stack[4096]; 26 #endif 27 28 /** 29 * acpi_save_state_mem - save kernel state 30 * 31 * Create an identity mapped page table and copy the wakeup routine to 32 * low memory. 33 * 34 * Note that this is too late to change acpi_wakeup_address. 35 */ 36 int acpi_save_state_mem(void) 37 { 38 struct wakeup_header *header; 39 40 if (!acpi_realmode) { 41 printk(KERN_ERR "Could not allocate memory during boot, " 42 "S3 disabled\n"); 43 return -ENOMEM; 44 } 45 memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE); 46 47 header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); 48 if (header->signature != 0x51ee1111) { 49 printk(KERN_ERR "wakeup header does not match\n"); 50 return -EINVAL; 51 } 52 53 header->video_mode = saved_video_mode; 54 55 header->wakeup_jmp_seg = acpi_wakeup_address >> 4; 56 57 /* 58 * Set up the wakeup GDT. We set these up as Big Real Mode, 59 * that is, with limits set to 4 GB. At least the Lenovo 60 * Thinkpad X61 is known to need this for the video BIOS 61 * initialization quirk to work; this is likely to also 62 * be the case for other laptops or integrated video devices. 63 */ 64 65 /* GDT[0]: GDT self-pointer */ 66 header->wakeup_gdt[0] = 67 (u64)(sizeof(header->wakeup_gdt) - 1) + 68 ((u64)(acpi_wakeup_address + 69 ((char *)&header->wakeup_gdt - (char *)acpi_realmode)) 70 << 16); 71 /* GDT[1]: big real mode-like code segment */ 72 header->wakeup_gdt[1] = 73 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); 74 /* GDT[2]: big real mode-like data segment */ 75 header->wakeup_gdt[2] = 76 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); 77 78 #ifndef CONFIG_64BIT 79 store_gdt((struct desc_ptr *)&header->pmode_gdt); 80 81 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low, 82 &header->pmode_efer_high)) 83 header->pmode_efer_low = header->pmode_efer_high = 0; 84 #endif /* !CONFIG_64BIT */ 85 86 header->pmode_cr0 = read_cr0(); 87 header->pmode_cr4 = read_cr4_safe(); 88 header->realmode_flags = acpi_realmode_flags; 89 header->real_magic = 0x12345678; 90 91 #ifndef CONFIG_64BIT 92 header->pmode_entry = (u32)&wakeup_pmode_return; 93 header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET); 94 saved_magic = 0x12345678; 95 #else /* CONFIG_64BIT */ 96 header->trampoline_segment = setup_trampoline() >> 4; 97 #ifdef CONFIG_SMP 98 stack_start.sp = temp_stack + sizeof(temp_stack); 99 early_gdt_descr.address = 100 (unsigned long)get_cpu_gdt_table(smp_processor_id()); 101 initial_gs = per_cpu_offset(smp_processor_id()); 102 #endif 103 initial_code = (unsigned long)wakeup_long64; 104 saved_magic = 0x123456789abcdef0L; 105 #endif /* CONFIG_64BIT */ 106 107 return 0; 108 } 109 110 /* 111 * acpi_restore_state - undo effects of acpi_save_state_mem 112 */ 113 void acpi_restore_state_mem(void) 114 { 115 } 116 117 118 /** 119 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation 120 * 121 * We allocate a page from the first 1MB of memory for the wakeup 122 * routine for when we come back from a sleep state. The 123 * runtime allocator allows specification of <16MB pages, but not 124 * <1MB pages. 125 */ 126 void __init acpi_reserve_wakeup_memory(void) 127 { 128 unsigned long mem; 129 130 if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { 131 printk(KERN_ERR 132 "ACPI: Wakeup code way too big, S3 disabled.\n"); 133 return; 134 } 135 136 mem = find_e820_area(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE); 137 138 if (mem == -1L) { 139 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); 140 return; 141 } 142 acpi_realmode = (unsigned long) phys_to_virt(mem); 143 acpi_wakeup_address = mem; 144 reserve_early(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP"); 145 } 146 147 148 static int __init acpi_sleep_setup(char *str) 149 { 150 while ((str != NULL) && (*str != '\0')) { 151 if (strncmp(str, "s3_bios", 7) == 0) 152 acpi_realmode_flags |= 1; 153 if (strncmp(str, "s3_mode", 7) == 0) 154 acpi_realmode_flags |= 2; 155 if (strncmp(str, "s3_beep", 7) == 0) 156 acpi_realmode_flags |= 4; 157 #ifdef CONFIG_HIBERNATION 158 if (strncmp(str, "s4_nohwsig", 10) == 0) 159 acpi_no_s4_hw_signature(); 160 if (strncmp(str, "s4_nonvs", 8) == 0) 161 acpi_s4_no_nvs(); 162 #endif 163 if (strncmp(str, "old_ordering", 12) == 0) 164 acpi_old_suspend_ordering(); 165 str = strchr(str, ','); 166 if (str != NULL) 167 str += strspn(str, ", \t"); 168 } 169 return 1; 170 } 171 172 __setup("acpi_sleep=", acpi_sleep_setup); 173