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
 22unsigned long acpi_realmode_flags;
 23
 24#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
 25static char temp_stack[4096];
 26#endif
 27
 28asmlinkage void acpi_enter_s3(void)
 
 
 
 
 
 
 29{
 30	acpi_enter_sleep_state(3, wake_sleep_flags);
 31}
 
 32/**
 33 * acpi_suspend_lowlevel - save kernel state
 34 *
 35 * Create an identity mapped page table and copy the wakeup routine to
 36 * low memory.
 37 */
 38int acpi_suspend_lowlevel(void)
 39{
 40	struct wakeup_header *header =
 41		(struct wakeup_header *) __va(real_mode_header->wakeup_header);
 42
 43	if (header->signature != WAKEUP_HEADER_SIGNATURE) {
 44		printk(KERN_ERR "wakeup header does not match\n");
 45		return -EINVAL;
 46	}
 47
 48	header->video_mode = saved_video_mode;
 49
 
 
 50#ifndef CONFIG_64BIT
 51	store_gdt((struct desc_ptr *)&header->pmode_gdt);
 52
 53	if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
 54		       &header->pmode_efer_high))
 55		header->pmode_efer_low = header->pmode_efer_high = 0;
 
 
 
 
 
 
 
 
 
 
 
 
 56#endif /* !CONFIG_64BIT */
 57
 58	header->pmode_cr0 = read_cr0();
 59	header->pmode_cr4 = read_cr4_safe();
 60	header->pmode_behavior = 0;
 
 
 61	if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
 62			&header->pmode_misc_en_low,
 63			&header->pmode_misc_en_high))
 
 
 
 64		header->pmode_behavior |=
 65			(1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
 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)__pa(&initial_page_table);
 72	saved_magic = 0x12345678;
 73#else /* CONFIG_64BIT */
 74#ifdef CONFIG_SMP
 75	stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
 76	early_gdt_descr.address =
 77			(unsigned long)get_cpu_gdt_table(smp_processor_id());
 78	initial_gs = per_cpu_offset(smp_processor_id());
 79#endif
 80	initial_code = (unsigned long)wakeup_long64;
 81       saved_magic = 0x123456789abcdef0L;
 82#endif /* CONFIG_64BIT */
 83
 84	do_suspend_lowlevel();
 85	return 0;
 86}
 87
 88static int __init acpi_sleep_setup(char *str)
 89{
 90	while ((str != NULL) && (*str != '\0')) {
 91		if (strncmp(str, "s3_bios", 7) == 0)
 92			acpi_realmode_flags |= 1;
 93		if (strncmp(str, "s3_mode", 7) == 0)
 94			acpi_realmode_flags |= 2;
 95		if (strncmp(str, "s3_beep", 7) == 0)
 96			acpi_realmode_flags |= 4;
 97#ifdef CONFIG_HIBERNATION
 98		if (strncmp(str, "s4_nohwsig", 10) == 0)
 99			acpi_no_s4_hw_signature();
100#endif
101		if (strncmp(str, "nonvs", 5) == 0)
102			acpi_nvs_nosave();
 
 
103		if (strncmp(str, "old_ordering", 12) == 0)
104			acpi_old_suspend_ordering();
105		str = strchr(str, ',');
106		if (str != NULL)
107			str += strspn(str, ", \t");
108	}
109	return 1;
110}
111
112__setup("acpi_sleep=", acpi_sleep_setup);

  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
 22unsigned long acpi_realmode_flags;
 23
 24#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
 25static char temp_stack[4096];
 26#endif
 27
 28/**
 29 * x86_acpi_enter_sleep_state - enter sleep state
 30 * @state: Sleep state to enter.
 31 *
 32 * Wrapper around acpi_enter_sleep_state() to be called by assmebly.
 33 */
 34acpi_status asmlinkage __visible x86_acpi_enter_sleep_state(u8 state)
 35{
 36	return acpi_enter_sleep_state(state);
 37}
 38
 39/**
 40 * x86_acpi_suspend_lowlevel - save kernel state
 41 *
 42 * Create an identity mapped page table and copy the wakeup routine to
 43 * low memory.
 44 */
 45int x86_acpi_suspend_lowlevel(void)
 46{
 47	struct wakeup_header *header =
 48		(struct wakeup_header *) __va(real_mode_header->wakeup_header);
 49
 50	if (header->signature != WAKEUP_HEADER_SIGNATURE) {
 51		printk(KERN_ERR "wakeup header does not match\n");
 52		return -EINVAL;
 53	}
 54
 55	header->video_mode = saved_video_mode;
 56
 57	header->pmode_behavior = 0;
 58
 59#ifndef CONFIG_64BIT
 60	native_store_gdt((struct desc_ptr *)&header->pmode_gdt);
 61
 62	/*
 63	 * We have to check that we can write back the value, and not
 64	 * just read it.  At least on 90 nm Pentium M (Family 6, Model
 65	 * 13), reading an invalid MSR is not guaranteed to trap, see
 66	 * Erratum X4 in "Intel Pentium M Processor on 90 nm Process
 67	 * with 2-MB L2 Cache and Intel® Processor A100 and A110 on 90
 68	 * nm process with 512-KB L2 Cache Specification Update".
 69	 */
 70	if (!rdmsr_safe(MSR_EFER,
 71			&header->pmode_efer_low,
 72			&header->pmode_efer_high) &&
 73	    !wrmsr_safe(MSR_EFER,
 74			header->pmode_efer_low,
 75			header->pmode_efer_high))
 76		header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER);
 77#endif /* !CONFIG_64BIT */
 78
 79	header->pmode_cr0 = read_cr0();
 80	if (__this_cpu_read(cpu_info.cpuid_level) >= 0) {
 81		header->pmode_cr4 = read_cr4();
 82		header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4);
 83	}
 84	if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
 85			&header->pmode_misc_en_low,
 86			&header->pmode_misc_en_high) &&
 87	    !wrmsr_safe(MSR_IA32_MISC_ENABLE,
 88			header->pmode_misc_en_low,
 89			header->pmode_misc_en_high))
 90		header->pmode_behavior |=
 91			(1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
 92	header->realmode_flags = acpi_realmode_flags;
 93	header->real_magic = 0x12345678;
 94
 95#ifndef CONFIG_64BIT
 96	header->pmode_entry = (u32)&wakeup_pmode_return;
 97	header->pmode_cr3 = (u32)__pa_symbol(initial_page_table);
 98	saved_magic = 0x12345678;
 99#else /* CONFIG_64BIT */
100#ifdef CONFIG_SMP
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());
105#endif
106	initial_code = (unsigned long)wakeup_long64;
107       saved_magic = 0x123456789abcdef0L;
108#endif /* CONFIG_64BIT */
109
110	do_suspend_lowlevel();
111	return 0;
112}
113
114static int __init acpi_sleep_setup(char *str)
115{
116	while ((str != NULL) && (*str != '\0')) {
117		if (strncmp(str, "s3_bios", 7) == 0)
118			acpi_realmode_flags |= 1;
119		if (strncmp(str, "s3_mode", 7) == 0)
120			acpi_realmode_flags |= 2;
121		if (strncmp(str, "s3_beep", 7) == 0)
122			acpi_realmode_flags |= 4;
123#ifdef CONFIG_HIBERNATION
124		if (strncmp(str, "s4_nohwsig", 10) == 0)
125			acpi_no_s4_hw_signature();
126#endif
127		if (strncmp(str, "nonvs", 5) == 0)
128			acpi_nvs_nosave();
129		if (strncmp(str, "nonvs_s3", 8) == 0)
130			acpi_nvs_nosave_s3();
131		if (strncmp(str, "old_ordering", 12) == 0)
132			acpi_old_suspend_ordering();
133		str = strchr(str, ',');
134		if (str != NULL)
135			str += strspn(str, ", \t");
136	}
137	return 1;
138}
139
140__setup("acpi_sleep=", acpi_sleep_setup);