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); 135