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160 lines
4.5 KiB
160 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* sleep.c - x86-specific ACPI sleep support. |
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* |
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* Copyright (C) 2001-2003 Patrick Mochel |
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* Copyright (C) 2001-2003 Pavel Machek <[email protected]> |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/memblock.h> |
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#include <linux/dmi.h> |
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#include <linux/cpumask.h> |
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#include <linux/pgtable.h> |
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#include <asm/segment.h> |
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#include <asm/desc.h> |
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#include <asm/cacheflush.h> |
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#include <asm/realmode.h> |
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#include <linux/ftrace.h> |
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#include "../../realmode/rm/wakeup.h" |
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#include "sleep.h" |
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unsigned long acpi_realmode_flags; |
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#if defined(CONFIG_SMP) && defined(CONFIG_64BIT) |
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static char temp_stack[4096]; |
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#endif |
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/** |
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* acpi_get_wakeup_address - provide physical address for S3 wakeup |
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* |
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* Returns the physical address where the kernel should be resumed after the |
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* system awakes from S3, e.g. for programming into the firmware waking vector. |
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*/ |
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unsigned long acpi_get_wakeup_address(void) |
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{ |
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return ((unsigned long)(real_mode_header->wakeup_start)); |
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} |
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/** |
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* x86_acpi_enter_sleep_state - enter sleep state |
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* @state: Sleep state to enter. |
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* |
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* Wrapper around acpi_enter_sleep_state() to be called by assmebly. |
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*/ |
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asmlinkage acpi_status __visible x86_acpi_enter_sleep_state(u8 state) |
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{ |
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return acpi_enter_sleep_state(state); |
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} |
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/** |
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* x86_acpi_suspend_lowlevel - save kernel state |
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* |
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* Create an identity mapped page table and copy the wakeup routine to |
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* low memory. |
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*/ |
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int x86_acpi_suspend_lowlevel(void) |
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{ |
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struct wakeup_header *header = |
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(struct wakeup_header *) __va(real_mode_header->wakeup_header); |
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if (header->signature != WAKEUP_HEADER_SIGNATURE) { |
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printk(KERN_ERR "wakeup header does not match\n"); |
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return -EINVAL; |
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} |
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header->video_mode = saved_video_mode; |
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header->pmode_behavior = 0; |
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#ifndef CONFIG_64BIT |
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native_store_gdt((struct desc_ptr *)&header->pmode_gdt); |
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/* |
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* We have to check that we can write back the value, and not |
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* just read it. At least on 90 nm Pentium M (Family 6, Model |
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* 13), reading an invalid MSR is not guaranteed to trap, see |
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* Erratum X4 in "Intel Pentium M Processor on 90 nm Process |
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* with 2-MB L2 Cache and Intel® Processor A100 and A110 on 90 |
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* nm process with 512-KB L2 Cache Specification Update". |
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*/ |
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if (!rdmsr_safe(MSR_EFER, |
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&header->pmode_efer_low, |
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&header->pmode_efer_high) && |
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!wrmsr_safe(MSR_EFER, |
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header->pmode_efer_low, |
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header->pmode_efer_high)) |
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header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER); |
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#endif /* !CONFIG_64BIT */ |
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header->pmode_cr0 = read_cr0(); |
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if (__this_cpu_read(cpu_info.cpuid_level) >= 0) { |
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header->pmode_cr4 = __read_cr4(); |
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header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4); |
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} |
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if (!rdmsr_safe(MSR_IA32_MISC_ENABLE, |
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&header->pmode_misc_en_low, |
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&header->pmode_misc_en_high) && |
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!wrmsr_safe(MSR_IA32_MISC_ENABLE, |
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header->pmode_misc_en_low, |
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header->pmode_misc_en_high)) |
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header->pmode_behavior |= |
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(1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE); |
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header->realmode_flags = acpi_realmode_flags; |
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header->real_magic = 0x12345678; |
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#ifndef CONFIG_64BIT |
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header->pmode_entry = (u32)&wakeup_pmode_return; |
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header->pmode_cr3 = (u32)__pa_symbol(initial_page_table); |
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saved_magic = 0x12345678; |
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#else /* CONFIG_64BIT */ |
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#ifdef CONFIG_SMP |
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initial_stack = (unsigned long)temp_stack + sizeof(temp_stack); |
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early_gdt_descr.address = |
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(unsigned long)get_cpu_gdt_rw(smp_processor_id()); |
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initial_gs = per_cpu_offset(smp_processor_id()); |
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#endif |
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initial_code = (unsigned long)wakeup_long64; |
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saved_magic = 0x123456789abcdef0L; |
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#endif /* CONFIG_64BIT */ |
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/* |
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* Pause/unpause graph tracing around do_suspend_lowlevel as it has |
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* inconsistent call/return info after it jumps to the wakeup vector. |
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*/ |
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pause_graph_tracing(); |
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do_suspend_lowlevel(); |
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unpause_graph_tracing(); |
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return 0; |
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} |
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static int __init acpi_sleep_setup(char *str) |
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{ |
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while ((str != NULL) && (*str != '\0')) { |
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if (strncmp(str, "s3_bios", 7) == 0) |
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acpi_realmode_flags |= 1; |
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if (strncmp(str, "s3_mode", 7) == 0) |
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acpi_realmode_flags |= 2; |
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if (strncmp(str, "s3_beep", 7) == 0) |
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acpi_realmode_flags |= 4; |
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#ifdef CONFIG_HIBERNATION |
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if (strncmp(str, "s4_nohwsig", 10) == 0) |
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acpi_no_s4_hw_signature(); |
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#endif |
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if (strncmp(str, "nonvs", 5) == 0) |
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acpi_nvs_nosave(); |
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if (strncmp(str, "nonvs_s3", 8) == 0) |
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acpi_nvs_nosave_s3(); |
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if (strncmp(str, "old_ordering", 12) == 0) |
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acpi_old_suspend_ordering(); |
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if (strncmp(str, "nobl", 4) == 0) |
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acpi_sleep_no_blacklist(); |
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str = strchr(str, ','); |
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if (str != NULL) |
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str += strspn(str, ", \t"); |
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} |
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return 1; |
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} |
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__setup("acpi_sleep=", acpi_sleep_setup);
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