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 #include <asm/pgtable.h> 16 #include <asm/cacheflush.h> 17 18 #include "realmode/wakeup.h" 19 #include "sleep.h" 20 21 unsigned long acpi_realmode_flags; 22 23 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) 24 static char temp_stack[4096]; 25 #endif 26 27 /** 28 * acpi_suspend_lowlevel - save kernel state 29 * 30 * Create an identity mapped page table and copy the wakeup routine to 31 * low memory. 32 */ 33 int acpi_suspend_lowlevel(void) 34 { 35 struct wakeup_header *header; 36 /* address in low memory of the wakeup routine. */ 37 char *acpi_realmode; 38 39 acpi_realmode = TRAMPOLINE_SYM(acpi_wakeup_code); 40 41 header = (struct wakeup_header *)(acpi_realmode + WAKEUP_HEADER_OFFSET); 42 if (header->signature != WAKEUP_HEADER_SIGNATURE) { 43 printk(KERN_ERR "wakeup header does not match\n"); 44 return -EINVAL; 45 } 46 47 header->video_mode = saved_video_mode; 48 49 header->wakeup_jmp_seg = acpi_wakeup_address >> 4; 50 51 /* 52 * Set up the wakeup GDT. We set these up as Big Real Mode, 53 * that is, with limits set to 4 GB. At least the Lenovo 54 * Thinkpad X61 is known to need this for the video BIOS 55 * initialization quirk to work; this is likely to also 56 * be the case for other laptops or integrated video devices. 57 */ 58 59 /* GDT[0]: GDT self-pointer */ 60 header->wakeup_gdt[0] = 61 (u64)(sizeof(header->wakeup_gdt) - 1) + 62 ((u64)__pa(&header->wakeup_gdt) << 16); 63 /* GDT[1]: big real mode-like code segment */ 64 header->wakeup_gdt[1] = 65 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); 66 /* GDT[2]: big real mode-like data segment */ 67 header->wakeup_gdt[2] = 68 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff); 69 70 #ifndef CONFIG_64BIT 71 store_gdt((struct desc_ptr *)&header->pmode_gdt); 72 73 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low, 74 &header->pmode_efer_high)) 75 header->pmode_efer_low = header->pmode_efer_high = 0; 76 #endif /* !CONFIG_64BIT */ 77 78 header->pmode_cr0 = read_cr0(); 79 header->pmode_cr4 = read_cr4_safe(); 80 header->realmode_flags = acpi_realmode_flags; 81 header->real_magic = 0x12345678; 82 83 #ifndef CONFIG_64BIT 84 header->pmode_entry = (u32)&wakeup_pmode_return; 85 header->pmode_cr3 = (u32)__pa(&initial_page_table); 86 saved_magic = 0x12345678; 87 #else /* CONFIG_64BIT */ 88 header->trampoline_segment = trampoline_address() >> 4; 89 #ifdef CONFIG_SMP 90 stack_start = (unsigned long)temp_stack + sizeof(temp_stack); 91 early_gdt_descr.address = 92 (unsigned long)get_cpu_gdt_table(smp_processor_id()); 93 initial_gs = per_cpu_offset(smp_processor_id()); 94 #endif 95 initial_code = (unsigned long)wakeup_long64; 96 saved_magic = 0x123456789abcdef0L; 97 #endif /* CONFIG_64BIT */ 98 99 do_suspend_lowlevel(); 100 return 0; 101 } 102 103 static int __init acpi_sleep_setup(char *str) 104 { 105 while ((str != NULL) && (*str != '\0')) { 106 if (strncmp(str, "s3_bios", 7) == 0) 107 acpi_realmode_flags |= 1; 108 if (strncmp(str, "s3_mode", 7) == 0) 109 acpi_realmode_flags |= 2; 110 if (strncmp(str, "s3_beep", 7) == 0) 111 acpi_realmode_flags |= 4; 112 #ifdef CONFIG_HIBERNATION 113 if (strncmp(str, "s4_nohwsig", 10) == 0) 114 acpi_no_s4_hw_signature(); 115 #endif 116 if (strncmp(str, "nonvs", 5) == 0) 117 acpi_nvs_nosave(); 118 if (strncmp(str, "old_ordering", 12) == 0) 119 acpi_old_suspend_ordering(); 120 str = strchr(str, ','); 121 if (str != NULL) 122 str += strspn(str, ", \t"); 123 } 124 return 1; 125 } 126 127 __setup("acpi_sleep=", acpi_sleep_setup); 128