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 header->pmode_efer_low = nx_enabled; 82 if (header->pmode_efer_low & 1) { 83 /* This is strange, why not save efer, always? */ 84 rdmsr(MSR_EFER, header->pmode_efer_low, 85 header->pmode_efer_high); 86 } 87 #endif /* !CONFIG_64BIT */ 88 89 header->pmode_cr0 = read_cr0(); 90 header->pmode_cr4 = read_cr4_safe(); 91 header->realmode_flags = acpi_realmode_flags; 92 header->real_magic = 0x12345678; 93 94 #ifndef CONFIG_64BIT 95 header->pmode_entry = (u32)&wakeup_pmode_return; 96 header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET); 97 saved_magic = 0x12345678; 98 #else /* CONFIG_64BIT */ 99 header->trampoline_segment = setup_trampoline() >> 4; 100 #ifdef CONFIG_SMP 101 stack_start.sp = 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 return 0; 111 } 112 113 /* 114 * acpi_restore_state - undo effects of acpi_save_state_mem 115 */ 116 void acpi_restore_state_mem(void) 117 { 118 } 119 120 121 /** 122 * acpi_reserve_bootmem - do _very_ early ACPI initialisation 123 * 124 * We allocate a page from the first 1MB of memory for the wakeup 125 * routine for when we come back from a sleep state. The 126 * runtime allocator allows specification of <16MB pages, but not 127 * <1MB pages. 128 */ 129 void __init acpi_reserve_bootmem(void) 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 acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE); 138 139 if (!acpi_realmode) { 140 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); 141 return; 142 } 143 144 acpi_wakeup_address = virt_to_phys((void *)acpi_realmode); 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