| 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 | |
| 13 | #include "realmode/wakeup.h" |
| 14 | #include "sleep.h" |
| 15 | |
| 16 | unsigned long acpi_wakeup_address; |
| 17 | unsigned long acpi_realmode_flags; |
| 18 | |
| 19 | /* address in low memory of the wakeup routine. */ |
| 20 | static unsigned long acpi_realmode; |
| 21 | |
| 22 | #ifdef CONFIG_64BIT |
| 23 | static char temp_stack[10240]; |
| 24 | #endif |
| 25 | |
| 26 | /** |
| 27 | * acpi_save_state_mem - save kernel state |
| 28 | * |
| 29 | * Create an identity mapped page table and copy the wakeup routine to |
| 30 | * low memory. |
| 31 | * |
| 32 | * Note that this is too late to change acpi_wakeup_address. |
| 33 | */ |
| 34 | int acpi_save_state_mem(void) |
| 35 | { |
| 36 | struct wakeup_header *header; |
| 37 | |
| 38 | if (!acpi_realmode) { |
| 39 | printk(KERN_ERR "Could not allocate memory during boot, " |
| 40 | "S3 disabled\n"); |
| 41 | return -ENOMEM; |
| 42 | } |
| 43 | memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE); |
| 44 | |
| 45 | header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); |
| 46 | if (header->signature != 0x51ee1111) { |
| 47 | printk(KERN_ERR "wakeup header does not match\n"); |
| 48 | return -EINVAL; |
| 49 | } |
| 50 | |
| 51 | header->video_mode = saved_video_mode; |
| 52 | |
| 53 | #ifndef CONFIG_64BIT |
| 54 | store_gdt((struct desc_ptr *)&header->pmode_gdt); |
| 55 | |
| 56 | header->pmode_efer_low = nx_enabled; |
| 57 | if (header->pmode_efer_low & 1) { |
| 58 | /* This is strange, why not save efer, always? */ |
| 59 | rdmsr(MSR_EFER, header->pmode_efer_low, |
| 60 | header->pmode_efer_high); |
| 61 | } |
| 62 | #endif /* !CONFIG_64BIT */ |
| 63 | |
| 64 | header->pmode_cr0 = read_cr0(); |
| 65 | header->pmode_cr4 = read_cr4(); |
| 66 | header->realmode_flags = acpi_realmode_flags; |
| 67 | header->real_magic = 0x12345678; |
| 68 | |
| 69 | #ifndef CONFIG_64BIT |
| 70 | header->pmode_entry = (u32)&wakeup_pmode_return; |
| 71 | header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET); |
| 72 | saved_magic = 0x12345678; |
| 73 | #else /* CONFIG_64BIT */ |
| 74 | header->trampoline_segment = setup_trampoline() >> 4; |
| 75 | init_rsp = (unsigned long)temp_stack + 4096; |
| 76 | initial_code = (unsigned long)wakeup_long64; |
| 77 | saved_magic = 0x123456789abcdef0; |
| 78 | #endif /* CONFIG_64BIT */ |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | /* |
| 84 | * acpi_restore_state - undo effects of acpi_save_state_mem |
| 85 | */ |
| 86 | void acpi_restore_state_mem(void) |
| 87 | { |
| 88 | } |
| 89 | |
| 90 | |
| 91 | /** |
| 92 | * acpi_reserve_bootmem - do _very_ early ACPI initialisation |
| 93 | * |
| 94 | * We allocate a page from the first 1MB of memory for the wakeup |
| 95 | * routine for when we come back from a sleep state. The |
| 96 | * runtime allocator allows specification of <16MB pages, but not |
| 97 | * <1MB pages. |
| 98 | */ |
| 99 | void __init acpi_reserve_bootmem(void) |
| 100 | { |
| 101 | if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) { |
| 102 | printk(KERN_ERR |
| 103 | "ACPI: Wakeup code way too big, S3 disabled.\n"); |
| 104 | return; |
| 105 | } |
| 106 | |
| 107 | acpi_realmode = (unsigned long)alloc_bootmem_low(WAKEUP_SIZE); |
| 108 | |
| 109 | if (!acpi_realmode) { |
| 110 | printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n"); |
| 111 | return; |
| 112 | } |
| 113 | |
| 114 | acpi_wakeup_address = acpi_realmode; |
| 115 | } |
| 116 | |
| 117 | |
| 118 | static int __init acpi_sleep_setup(char *str) |
| 119 | { |
| 120 | while ((str != NULL) && (*str != '\0')) { |
| 121 | if (strncmp(str, "s3_bios", 7) == 0) |
| 122 | acpi_realmode_flags |= 1; |
| 123 | if (strncmp(str, "s3_mode", 7) == 0) |
| 124 | acpi_realmode_flags |= 2; |
| 125 | if (strncmp(str, "s3_beep", 7) == 0) |
| 126 | acpi_realmode_flags |= 4; |
| 127 | str = strchr(str, ','); |
| 128 | if (str != NULL) |
| 129 | str += strspn(str, ", \t"); |
| 130 | } |
| 131 | return 1; |
| 132 | } |
| 133 | |
| 134 | __setup("acpi_sleep=", acpi_sleep_setup); |