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

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * sleep.c - x86-specific ACPI sleep support.
  4  *
  5  *  Copyright (C) 2001-2003 Patrick Mochel
  6  *  Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz>
  7  */
  8 
  9 #include <linux/acpi.h>
 10 #include <linux/bootmem.h>
 11 #include <linux/memblock.h>
 12 #include <linux/dmi.h>
 13 #include <linux/cpumask.h>
 14 #include <asm/segment.h>
 15 #include <asm/desc.h>
 16 #include <asm/pgtable.h>
 17 #include <asm/cacheflush.h>
 18 #include <asm/realmode.h>
 19 
 20 #include <linux/ftrace.h>
 21 #include "../../realmode/rm/wakeup.h"
 22 #include "sleep.h"
 23 
 24 unsigned long acpi_realmode_flags;
 25 
 26 #if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
 27 static char temp_stack[4096];
 28 #endif
 29 
 30 /**
 31  * x86_acpi_enter_sleep_state - enter sleep state
 32  * @state: Sleep state to enter.
 33  *
 34  * Wrapper around acpi_enter_sleep_state() to be called by assmebly.
 35  */
 36 acpi_status asmlinkage __visible x86_acpi_enter_sleep_state(u8 state)
 37 {
 38         return acpi_enter_sleep_state(state);
 39 }
 40 
 41 /**
 42  * x86_acpi_suspend_lowlevel - save kernel state
 43  *
 44  * Create an identity mapped page table and copy the wakeup routine to
 45  * low memory.
 46  */
 47 int x86_acpi_suspend_lowlevel(void)
 48 {
 49         struct wakeup_header *header =
 50                 (struct wakeup_header *) __va(real_mode_header->wakeup_header);
 51 
 52         if (header->signature != WAKEUP_HEADER_SIGNATURE) {
 53                 printk(KERN_ERR "wakeup header does not match\n");
 54                 return -EINVAL;
 55         }
 56 
 57         header->video_mode = saved_video_mode;
 58 
 59         header->pmode_behavior = 0;
 60 
 61 #ifndef CONFIG_64BIT
 62         native_store_gdt((struct desc_ptr *)&header->pmode_gdt);
 63 
 64         /*
 65          * We have to check that we can write back the value, and not
 66          * just read it.  At least on 90 nm Pentium M (Family 6, Model
 67          * 13), reading an invalid MSR is not guaranteed to trap, see
 68          * Erratum X4 in "Intel Pentium M Processor on 90 nm Process
 69          * with 2-MB L2 Cache and IntelĀ® Processor A100 and A110 on 90
 70          * nm process with 512-KB L2 Cache Specification Update".
 71          */
 72         if (!rdmsr_safe(MSR_EFER,
 73                         &header->pmode_efer_low,
 74                         &header->pmode_efer_high) &&
 75             !wrmsr_safe(MSR_EFER,
 76                         header->pmode_efer_low,
 77                         header->pmode_efer_high))
 78                 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER);
 79 #endif /* !CONFIG_64BIT */
 80 
 81         header->pmode_cr0 = read_cr0();
 82         if (__this_cpu_read(cpu_info.cpuid_level) >= 0) {
 83                 header->pmode_cr4 = __read_cr4();
 84                 header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4);
 85         }
 86         if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
 87                         &header->pmode_misc_en_low,
 88                         &header->pmode_misc_en_high) &&
 89             !wrmsr_safe(MSR_IA32_MISC_ENABLE,
 90                         header->pmode_misc_en_low,
 91                         header->pmode_misc_en_high))
 92                 header->pmode_behavior |=
 93                         (1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
 94         header->realmode_flags = acpi_realmode_flags;
 95         header->real_magic = 0x12345678;
 96 
 97 #ifndef CONFIG_64BIT
 98         header->pmode_entry = (u32)&wakeup_pmode_return;
 99         header->pmode_cr3 = (u32)__pa_symbol(initial_page_table);
100         saved_magic = 0x12345678;
101 #else /* CONFIG_64BIT */
102 #ifdef CONFIG_SMP
103         initial_stack = (unsigned long)temp_stack + sizeof(temp_stack);
104         early_gdt_descr.address =
105                         (unsigned long)get_cpu_gdt_rw(smp_processor_id());
106         initial_gs = per_cpu_offset(smp_processor_id());
107 #endif
108         initial_code = (unsigned long)wakeup_long64;
109        saved_magic = 0x123456789abcdef0L;
110 #endif /* CONFIG_64BIT */
111 
112         /*
113          * Pause/unpause graph tracing around do_suspend_lowlevel as it has
114          * inconsistent call/return info after it jumps to the wakeup vector.
115          */
116         pause_graph_tracing();
117         do_suspend_lowlevel();
118         unpause_graph_tracing();
119         return 0;
120 }
121 
122 static int __init acpi_sleep_setup(char *str)
123 {
124         while ((str != NULL) && (*str != '\0')) {
125                 if (strncmp(str, "s3_bios", 7) == 0)
126                         acpi_realmode_flags |= 1;
127                 if (strncmp(str, "s3_mode", 7) == 0)
128                         acpi_realmode_flags |= 2;
129                 if (strncmp(str, "s3_beep", 7) == 0)
130                         acpi_realmode_flags |= 4;
131 #ifdef CONFIG_HIBERNATION
132                 if (strncmp(str, "s4_nohwsig", 10) == 0)
133                         acpi_no_s4_hw_signature();
134 #endif
135                 if (strncmp(str, "nonvs", 5) == 0)
136                         acpi_nvs_nosave();
137                 if (strncmp(str, "nonvs_s3", 8) == 0)
138                         acpi_nvs_nosave_s3();
139                 if (strncmp(str, "old_ordering", 12) == 0)
140                         acpi_old_suspend_ordering();
141                 str = strchr(str, ',');
142                 if (str != NULL)
143                         str += strspn(str, ", \t");
144         }
145         return 1;
146 }
147 
148 __setup("acpi_sleep=", acpi_sleep_setup);
149 

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