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 14 #include "realmode/wakeup.h" 15 #include "sleep.h" 16 17 unsigned long acpi_wakeup_address; 18 unsigned long acpi_realmode_flags; 19 20 /* address in low memory of the wakeup routine. */ 21 static unsigned long acpi_realmode; 22 23 #ifdef CONFIG_64BIT 24 static char temp_stack[10240]; 25 #endif 26 27 /** 28 * acpi_save_state_mem - save kernel state 29 * 30 * Create an identity mapped page table and copy the wakeup routine to 31 * low memory. 32 * 33 * Note that this is too late to change acpi_wakeup_address. 34 */ 35 int acpi_save_state_mem(void) 36 { 37 struct wakeup_header *header; 38 39 if (!acpi_realmode) { 40 printk(KERN_ERR "Could not allocate memory during boot, " 41 "S3 disabled\n"); 42 return -ENOMEM; 43 } 44 memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE); 45 46 header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); 47 if (header->signature != 0x51ee1111) { 48 printk(KERN_ERR "wakeup header does not match\n"); 49 return -EINVAL; 50 } 51 52 header->video_mode = saved_video_mode; 53 54 header->wakeup_jmp_seg = acpi_wakeup_address >> 4; 55 56 /* 57 * Set up the wakeup GDT. We set these up as Big Real Mode, 58 * that is, with limits set to 4 GB. At least the Lenovo 59 * Thinkpad X61 is known to need this for the video BIOS 60 * initialization quirk to work; this is likely to also 61 * be the case for other laptops or integrated video devices. 62 */ 63 64 /* GDT[0]: GDT self-pointer */ 65 header->wakeup_gdt[0] = 66 (u64)(sizeof(header->wakeup_gdt) - 1) + 67 ((u64)(acpi_wakeup_address + 68 ((char *)&header->wakeup_gdt - (char *)acpi_realmode)) 69 << 16); 70 /* GDT[1]: big real mode-like code segment */ 71 header->wakeup_gdt[1] = 72 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); 73 /* GDT[2]: big real mode-like data segment */ 74 header->wakeup_gdt[2] = 75 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); 76 77 #ifndef CONFIG_64BIT 78 store_gdt((struct desc_ptr *)&header->pmode_gdt); 79 80 header->pmode_efer_low = nx_enabled; 81 if (header->pmode_efer_low & 1) { 82 /* This is strange, why not save efer, always? */ 83 rdmsr(MSR_EFER, header->pmode_efer_low, 84 header->pmode_efer_high); 85 } 86 #endif /* !CONFIG_64BIT */ 87 88 header->pmode_cr0 = read_cr0(); 89 header->pmode_cr4 = read_cr4(); 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)(swsusp_pg_dir - __PAGE_OFFSET); 96 saved_magic = 0x12345678; 97 #else /* CONFIG_64BIT */ 98 header->trampoline_segment = setup_trampoline() >> 4; 99 #ifdef CONFIG_SMP 100 stack_start.sp = temp_stack + 4096; 101 #endif 102 initial_code = (unsigned long)wakeup_long64; 103 saved_magic = 0x123456789abcdef0; 104 #endif /* CONFIG_64BIT */ 105 106 return 0; 107 } 108 109 /* 110 * acpi_restore_state - undo effects of acpi_save_state_mem 111 */ 112 void acpi_restore_state_mem(void) 113 { 114 } 115 116 117 /** 118 * acpi_reserve_bootmem - do _very_ early ACPI initialisation 119 * 120 * We allocate a page from the first 1MB of memory for the wakeup 121 * routine for when we come back from a sleep state. The 122 * runtime allocator allows specification of <16MB pages, but not 123 * <1MB pages. 124 */ 125 void __init acpi_reserve_bootmem(void) 126 { 127 if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { 128 printk(KERN_ERR 129 "ACPI: Wakeup code way too big, S3 disabled.\n"); 130 return; 131 } 132 133 acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE); 134 135 if (!acpi_realmode) { 136 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); 137 return; 138 } 139 140 acpi_wakeup_address = virt_to_phys((void *)acpi_realmode); 141 } 142 143 144 static int __init acpi_sleep_setup(char *str) 145 { 146 while ((str != NULL) && (*str != '\0')) { 147 if (strncmp(str, "s3_bios", 7) == 0) 148 acpi_realmode_flags |= 1; 149 if (strncmp(str, "s3_mode", 7) == 0) 150 acpi_realmode_flags |= 2; 151 if (strncmp(str, "s3_beep", 7) == 0) 152 acpi_realmode_flags |= 4; 153 #ifdef CONFIG_HIBERNATION 154 if (strncmp(str, "s4_nohwsig", 10) == 0) 155 acpi_no_s4_hw_signature(); 156 #endif 157 if (strncmp(str, "old_ordering", 12) == 0) 158 acpi_old_suspend_ordering(); 159 str = strchr(str, ','); 160 if (str != NULL) 161 str += strspn(str, ", \t"); 162 } 163 return 1; 164 } 165 166 __setup("acpi_sleep=", acpi_sleep_setup); 167