| | 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 | #include <asm/realmode.h> |
| | 18 | |
| | 19 | #include "../../realmode/rm/wakeup.h" |
| | 20 | #include "sleep.h" |
| | 21 | |
| | 22 | unsigned long acpi_realmode_flags; |
| | 23 | |
| | 24 | #if defined(CONFIG_SMP) && defined(CONFIG_64BIT) |
| | 25 | static char temp_stack[4096]; |
| | 26 | #endif |
| | 27 | |
| | 28 | /** |
| | 29 | * acpi_suspend_lowlevel - save kernel state |
| | 30 | * |
| | 31 | * Create an identity mapped page table and copy the wakeup routine to |
| | 32 | * low memory. |
| | 33 | */ |
| | 34 | int acpi_suspend_lowlevel(void) |
| | 35 | { |
| | 36 | struct wakeup_header *header = |
| | 37 | (struct wakeup_header *) __va(real_mode_header->wakeup_header); |
| | 38 | |
| | 39 | if (header->signature != WAKEUP_HEADER_SIGNATURE) { |
| | 40 | printk(KERN_ERR "wakeup header does not match\n"); |
| | 41 | return -EINVAL; |
| | 42 | } |
| | 43 | |
| | 44 | header->video_mode = saved_video_mode; |
| | 45 | |
| | 46 | header->pmode_behavior = 0; |
| | 47 | |
| | 48 | #ifndef CONFIG_64BIT |
| | 49 | store_gdt((struct desc_ptr *)&header->pmode_gdt); |
| | 50 | |
| | 51 | if (!rdmsr_safe(MSR_EFER, |
| | 52 | &header->pmode_efer_low, |
| | 53 | &header->pmode_efer_high)) |
| | 54 | header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER); |
| | 55 | #endif /* !CONFIG_64BIT */ |
| | 56 | |
| | 57 | header->pmode_cr0 = read_cr0(); |
| | 58 | if (__this_cpu_read(cpu_info.cpuid_level) >= 0) { |
| | 59 | header->pmode_cr4 = read_cr4(); |
| | 60 | header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4); |
| | 61 | } |
| | 62 | if (!rdmsr_safe(MSR_IA32_MISC_ENABLE, |
| | 63 | &header->pmode_misc_en_low, |
| | 64 | &header->pmode_misc_en_high)) |
| | 65 | header->pmode_behavior |= |
| | 66 | (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE); |
| | 67 | header->realmode_flags = acpi_realmode_flags; |
| | 68 | header->real_magic = 0x12345678; |
| | 69 | |
| | 70 | #ifndef CONFIG_64BIT |
| | 71 | header->pmode_entry = (u32)&wakeup_pmode_return; |
| | 72 | header->pmode_cr3 = (u32)__pa(&initial_page_table); |
| | 73 | saved_magic = 0x12345678; |
| | 74 | #else /* CONFIG_64BIT */ |
| | 75 | #ifdef CONFIG_SMP |
| | 76 | stack_start = (unsigned long)temp_stack + sizeof(temp_stack); |
| | 77 | early_gdt_descr.address = |
| | 78 | (unsigned long)get_cpu_gdt_table(smp_processor_id()); |
| | 79 | initial_gs = per_cpu_offset(smp_processor_id()); |
| | 80 | #endif |
| | 81 | initial_code = (unsigned long)wakeup_long64; |
| | 82 | saved_magic = 0x123456789abcdef0L; |
| | 83 | #endif /* CONFIG_64BIT */ |
| | 84 | |
| | 85 | do_suspend_lowlevel(); |
| | 86 | return 0; |
| | 87 | } |
| | 88 | |
| | 89 | static int __init acpi_sleep_setup(char *str) |
| | 90 | { |
| | 91 | while ((str != NULL) && (*str != '\0')) { |
| | 92 | if (strncmp(str, "s3_bios", 7) == 0) |
| | 93 | acpi_realmode_flags |= 1; |
| | 94 | if (strncmp(str, "s3_mode", 7) == 0) |
| | 95 | acpi_realmode_flags |= 2; |
| | 96 | if (strncmp(str, "s3_beep", 7) == 0) |
| | 97 | acpi_realmode_flags |= 4; |
| | 98 | #ifdef CONFIG_HIBERNATION |
| | 99 | if (strncmp(str, "s4_nohwsig", 10) == 0) |
| | 100 | acpi_no_s4_hw_signature(); |
| | 101 | #endif |
| | 102 | if (strncmp(str, "nonvs", 5) == 0) |
| | 103 | acpi_nvs_nosave(); |
| | 104 | if (strncmp(str, "old_ordering", 12) == 0) |
| | 105 | acpi_old_suspend_ordering(); |
| | 106 | str = strchr(str, ','); |
| | 107 | if (str != NULL) |
| | 108 | str += strspn(str, ", \t"); |
| | 109 | } |
| | 110 | return 1; |
| | 111 | } |
| | 112 | |
| | 113 | __setup("acpi_sleep=", acpi_sleep_setup); |
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