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/arch/x86/kernel/acpi/sleep.c

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C | 177 lines | 115 code | 26 blank | 36 comment | 28 complexity | 90059ce7ff8624c27144a9897a5bce69 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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#include <asm/segment.h>
 13#include <asm/desc.h>
 14
 15#include "realmode/wakeup.h"
 16#include "sleep.h"
 17
 18unsigned long acpi_wakeup_address;
 19unsigned long acpi_realmode_flags;
 20
 21/* address in low memory of the wakeup routine. */
 22static unsigned long acpi_realmode;
 23
 24#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
 25static char temp_stack[4096];
 26#endif
 27
 28/**
 29 * acpi_save_state_mem - save kernel state
 30 *
 31 * Create an identity mapped page table and copy the wakeup routine to
 32 * low memory.
 33 *
 34 * Note that this is too late to change acpi_wakeup_address.
 35 */
 36int acpi_save_state_mem(void)
 37{
 38	struct wakeup_header *header;
 39
 40	if (!acpi_realmode) {
 41		printk(KERN_ERR "Could not allocate memory during boot, "
 42		       "S3 disabled\n");
 43		return -ENOMEM;
 44	}
 45	memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
 46
 47	header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
 48	if (header->signature != 0x51ee1111) {
 49		printk(KERN_ERR "wakeup header does not match\n");
 50		return -EINVAL;
 51	}
 52
 53	header->video_mode = saved_video_mode;
 54
 55	header->wakeup_jmp_seg = acpi_wakeup_address >> 4;
 56
 57	/*
 58	 * Set up the wakeup GDT.  We set these up as Big Real Mode,
 59	 * that is, with limits set to 4 GB.  At least the Lenovo
 60	 * Thinkpad X61 is known to need this for the video BIOS
 61	 * initialization quirk to work; this is likely to also
 62	 * be the case for other laptops or integrated video devices.
 63	 */
 64
 65	/* GDT[0]: GDT self-pointer */
 66	header->wakeup_gdt[0] =
 67		(u64)(sizeof(header->wakeup_gdt) - 1) +
 68		((u64)(acpi_wakeup_address +
 69			((char *)&header->wakeup_gdt - (char *)acpi_realmode))
 70				<< 16);
 71	/* GDT[1]: big real mode-like code segment */
 72	header->wakeup_gdt[1] =
 73		GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
 74	/* GDT[2]: big real mode-like data segment */
 75	header->wakeup_gdt[2] =
 76		GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);
 77
 78#ifndef CONFIG_64BIT
 79	store_gdt((struct desc_ptr *)&header->pmode_gdt);
 80
 81	if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
 82		       &header->pmode_efer_high))
 83		header->pmode_efer_low = header->pmode_efer_high = 0;
 84#endif /* !CONFIG_64BIT */
 85
 86	header->pmode_cr0 = read_cr0();
 87	header->pmode_cr4 = read_cr4_safe();
 88	header->realmode_flags = acpi_realmode_flags;
 89	header->real_magic = 0x12345678;
 90
 91#ifndef CONFIG_64BIT
 92	header->pmode_entry = (u32)&wakeup_pmode_return;
 93	header->pmode_cr3 = (u32)(swsusp_pg_dir - __PAGE_OFFSET);
 94	saved_magic = 0x12345678;
 95#else /* CONFIG_64BIT */
 96	header->trampoline_segment = setup_trampoline() >> 4;
 97#ifdef CONFIG_SMP
 98	stack_start.sp = temp_stack + sizeof(temp_stack);
 99	early_gdt_descr.address =
100			(unsigned long)get_cpu_gdt_table(smp_processor_id());
101	initial_gs = per_cpu_offset(smp_processor_id());
102#endif
103	initial_code = (unsigned long)wakeup_long64;
104       saved_magic = 0x123456789abcdef0L;
105#endif /* CONFIG_64BIT */
106
107	return 0;
108}
109
110/*
111 * acpi_restore_state - undo effects of acpi_save_state_mem
112 */
113void acpi_restore_state_mem(void)
114{
115}
116
117
118/**
119 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
120 *
121 * We allocate a page from the first 1MB of memory for the wakeup
122 * routine for when we come back from a sleep state. The
123 * runtime allocator allows specification of <16MB pages, but not
124 * <1MB pages.
125 */
126void __init acpi_reserve_wakeup_memory(void)
127{
128	unsigned long mem;
129
130	if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
131		printk(KERN_ERR
132		       "ACPI: Wakeup code way too big, S3 disabled.\n");
133		return;
134	}
135
136	mem = find_e820_area(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
137
138	if (mem == -1L) {
139		printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
140		return;
141	}
142	acpi_realmode = (unsigned long) phys_to_virt(mem);
143	acpi_wakeup_address = mem;
144	reserve_early(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
145}
146
147
148static int __init acpi_sleep_setup(char *str)
149{
150	while ((str != NULL) && (*str != '\0')) {
151		if (strncmp(str, "s3_bios", 7) == 0)
152			acpi_realmode_flags |= 1;
153		if (strncmp(str, "s3_mode", 7) == 0)
154			acpi_realmode_flags |= 2;
155		if (strncmp(str, "s3_beep", 7) == 0)
156			acpi_realmode_flags |= 4;
157#ifdef CONFIG_HIBERNATION
158		if (strncmp(str, "s4_nohwsig", 10) == 0)
159			acpi_no_s4_hw_signature();
160		if (strncmp(str, "s4_nonvs", 8) == 0) {
161			pr_warning("ACPI: acpi_sleep=s4_nonvs is deprecated, "
162					"please use acpi_sleep=nonvs instead");
163			acpi_nvs_nosave();
164		}
165#endif
166		if (strncmp(str, "nonvs", 5) == 0)
167			acpi_nvs_nosave();
168		if (strncmp(str, "old_ordering", 12) == 0)
169			acpi_old_suspend_ordering();
170		str = strchr(str, ',');
171		if (str != NULL)
172			str += strspn(str, ", \t");
173	}
174	return 1;
175}
176
177__setup("acpi_sleep=", acpi_sleep_setup);