2 * sleep.c - x86-specific ACPI sleep support.
4 * Copyright (C) 2001-2003 Patrick Mochel
5 * Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz>
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>
15 #include <asm/pgtable.h>
16 #include <asm/cacheflush.h>
18 #include "realmode/wakeup.h"
21 unsigned long acpi_wakeup_address;
22 unsigned long acpi_realmode_flags;
24 /* address in low memory of the wakeup routine. */
25 static unsigned long acpi_realmode;
27 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
28 static char temp_stack[4096];
32 * acpi_save_state_mem - save kernel state
34 * Create an identity mapped page table and copy the wakeup routine to
37 * Note that this is too late to change acpi_wakeup_address.
39 int acpi_save_state_mem(void)
41 struct wakeup_header *header;
44 printk(KERN_ERR "Could not allocate memory during boot, "
48 memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
50 header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
51 if (header->signature != 0x51ee1111) {
52 printk(KERN_ERR "wakeup header does not match\n");
56 header->video_mode = saved_video_mode;
58 header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
61 * Set up the wakeup GDT. We set these up as Big Real Mode,
62 * that is, with limits set to 4 GB. At least the Lenovo
63 * Thinkpad X61 is known to need this for the video BIOS
64 * initialization quirk to work; this is likely to also
65 * be the case for other laptops or integrated video devices.
68 /* GDT[0]: GDT self-pointer */
69 header->wakeup_gdt[0] =
70 (u64)(sizeof(header->wakeup_gdt) - 1) +
71 ((u64)(acpi_wakeup_address +
72 ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
74 /* GDT[1]: big real mode-like code segment */
75 header->wakeup_gdt[1] =
76 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
77 /* GDT[2]: big real mode-like data segment */
78 header->wakeup_gdt[2] =
79 GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
82 store_gdt((struct desc_ptr *)&header->pmode_gdt);
84 if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
85 &header->pmode_efer_high))
86 header->pmode_efer_low = header->pmode_efer_high = 0;
87 #endif /* !CONFIG_64BIT */
89 header->pmode_cr0 = read_cr0();
90 header->pmode_cr4 = read_cr4_safe();
91 header->realmode_flags = acpi_realmode_flags;
92 header->real_magic = 0x12345678;
95 header->pmode_entry = (u32)&wakeup_pmode_return;
96 header->pmode_cr3 = (u32)__pa(&initial_page_table);
97 saved_magic = 0x12345678;
98 #else /* CONFIG_64BIT */
99 header->trampoline_segment = setup_trampoline() >> 4;
101 stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
102 early_gdt_descr.address =
103 (unsigned long)get_cpu_gdt_table(smp_processor_id());
104 initial_gs = per_cpu_offset(smp_processor_id());
106 initial_code = (unsigned long)wakeup_long64;
107 saved_magic = 0x123456789abcdef0L;
108 #endif /* CONFIG_64BIT */
114 * acpi_restore_state - undo effects of acpi_save_state_mem
116 void acpi_restore_state_mem(void)
122 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
124 * We allocate a page from the first 1MB of memory for the wakeup
125 * routine for when we come back from a sleep state. The
126 * runtime allocator allows specification of <16MB pages, but not
129 void __init acpi_reserve_wakeup_memory(void)
133 if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
135 "ACPI: Wakeup code way too big, S3 disabled.\n");
139 mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
141 if (mem == MEMBLOCK_ERROR) {
142 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
145 acpi_realmode = (unsigned long) phys_to_virt(mem);
146 acpi_wakeup_address = mem;
147 memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
150 int __init acpi_configure_wakeup_memory(void)
153 set_memory_x(acpi_realmode, WAKEUP_SIZE >> PAGE_SHIFT);
157 arch_initcall(acpi_configure_wakeup_memory);
160 static int __init acpi_sleep_setup(char *str)
162 while ((str != NULL) && (*str != '\0')) {
163 if (strncmp(str, "s3_bios", 7) == 0)
164 acpi_realmode_flags |= 1;
165 if (strncmp(str, "s3_mode", 7) == 0)
166 acpi_realmode_flags |= 2;
167 if (strncmp(str, "s3_beep", 7) == 0)
168 acpi_realmode_flags |= 4;
169 #ifdef CONFIG_HIBERNATION
170 if (strncmp(str, "s4_nohwsig", 10) == 0)
171 acpi_no_s4_hw_signature();
172 if (strncmp(str, "s4_nonvs", 8) == 0) {
173 pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
174 "please use acpi_sleep=nonvs instead");
178 if (strncmp(str, "nonvs", 5) == 0)
180 if (strncmp(str, "old_ordering", 12) == 0)
181 acpi_old_suspend_ordering();
182 str = strchr(str, ',');
184 str += strspn(str, ", \t");
189 __setup("acpi_sleep=", acpi_sleep_setup);