cregit-Linux how code gets into the kernel

Release 4.10 arch/x86/kernel/acpi/sleep.c

Directory: arch/x86/kernel/acpi
/*
 * sleep.c - x86-specific ACPI sleep support.
 *
 *  Copyright (C) 2001-2003 Patrick Mochel
 *  Copyright (C) 2001-2003 Pavel Machek <pavel@ucw.cz>
 */

#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/dmi.h>
#include <linux/cpumask.h>
#include <asm/segment.h>
#include <asm/desc.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/realmode.h>

#include <linux/ftrace.h>
#include "../../realmode/rm/wakeup.h"
#include "sleep.h"


unsigned long acpi_realmode_flags;

#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)

static char temp_stack[4096];
#endif

/**
 * x86_acpi_enter_sleep_state - enter sleep state
 * @state: Sleep state to enter.
 *
 * Wrapper around acpi_enter_sleep_state() to be called by assmebly.
 */



acpi_status asmlinkage __visible x86_acpi_enter_sleep_state(u8 state)
{
	return acpi_enter_sleep_state(state);
}


Contributors
PersonTokensPropCommitsCommitProp
lv zhenglv zheng1593.75%150.00%


andi kleenandi kleen16.25%150.00%


Total16100.00%2100.00%



/**
 * x86_acpi_suspend_lowlevel - save kernel state
 *
 * Create an identity mapped page table and copy the wakeup routine to
 * low memory.
 */



int x86_acpi_suspend_lowlevel(void)
{
	struct wakeup_header *header =
		(struct wakeup_header *) __va(real_mode_header->wakeup_header);

	if (header->signature != WAKEUP_HEADER_SIGNATURE) {
		printk(KERN_ERR "wakeup header does not match\n");
		return -EINVAL;
	}

	header->video_mode = saved_video_mode;

	header->pmode_behavior = 0;

#ifndef CONFIG_64BIT
	native_store_gdt((struct desc_ptr *)&header->pmode_gdt);

	/*
         * We have to check that we can write back the value, and not
         * just read it.  At least on 90 nm Pentium M (Family 6, Model
         * 13), reading an invalid MSR is not guaranteed to trap, see
         * Erratum X4 in "Intel Pentium M Processor on 90 nm Process
         * with 2-MB L2 Cache and Intel® Processor A100 and A110 on 90
         * nm process with 512-KB L2 Cache Specification Update".
         */
	if (!rdmsr_safe(MSR_EFER,
			&header->pmode_efer_low,
			&header->pmode_efer_high) &&
	    !wrmsr_safe(MSR_EFER,
			header->pmode_efer_low,
			header->pmode_efer_high))
		header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_EFER);
#endif /* !CONFIG_64BIT */

	header->pmode_cr0 = read_cr0();
	if (__this_cpu_read(cpu_info.cpuid_level) >= 0) {
		header->pmode_cr4 = __read_cr4();
		header->pmode_behavior |= (1 << WAKEUP_BEHAVIOR_RESTORE_CR4);
	}
	if (!rdmsr_safe(MSR_IA32_MISC_ENABLE,
			&header->pmode_misc_en_low,
			&header->pmode_misc_en_high) &&
	    !wrmsr_safe(MSR_IA32_MISC_ENABLE,
			header->pmode_misc_en_low,
			header->pmode_misc_en_high))
		header->pmode_behavior |=
			(1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
	header->realmode_flags = acpi_realmode_flags;
	header->real_magic = 0x12345678;

#ifndef CONFIG_64BIT
	header->pmode_entry = (u32)&wakeup_pmode_return;
	header->pmode_cr3 = (u32)__pa_symbol(initial_page_table);
	saved_magic = 0x12345678;
#else /* CONFIG_64BIT */
#ifdef CONFIG_SMP
	initial_stack = (unsigned long)temp_stack + sizeof(temp_stack);
	early_gdt_descr.address =
			(unsigned long)get_cpu_gdt_table(smp_processor_id());
	initial_gs = per_cpu_offset(smp_processor_id());
#endif
	initial_code = (unsigned long)wakeup_long64;
       saved_magic = 0x123456789abcdef0L;
#endif /* CONFIG_64BIT */

	/*
         * Pause/unpause graph tracing around do_suspend_lowlevel as it has
         * inconsistent call/return info after it jumps to the wakeup vector.
         */
	pause_graph_tracing();
	do_suspend_lowlevel();
	unpause_graph_tracing();
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
pavel machekpavel machek13142.39%14.17%


h. peter anvinh. peter anvin7323.62%520.83%


kees cookkees cook3210.36%14.17%


rafael j. wysockirafael j. wysocki175.50%28.33%


andi kleenandi kleen154.85%14.17%


tejun heotejun heo82.59%28.33%


jarkko sakkinenjarkko sakkinen82.59%28.33%


todd e brandttodd e brandt72.27%14.17%


ingo molnaringo molnar51.62%14.17%


matt mackallmatt mackall41.29%14.17%


borislav petkovborislav petkov30.97%14.17%


konrad rzeszutek wilkkonrad rzeszutek wilk20.65%28.33%


josh poimboeufjosh poimboeuf10.32%14.17%


alexander duyckalexander duyck10.32%14.17%


andy lutomirskiandy lutomirski10.32%14.17%


jaswinder singh rajputjaswinder singh rajput10.32%14.17%


Total309100.00%24100.00%






static int __init acpi_sleep_setup(char *str)
{
	while ((str != NULL) && (*str != '\0')) {
		if (strncmp(str, "s3_bios", 7) == 0)
			acpi_realmode_flags |= 1;
		if (strncmp(str, "s3_mode", 7) == 0)
			acpi_realmode_flags |= 2;
		if (strncmp(str, "s3_beep", 7) == 0)
			acpi_realmode_flags |= 4;
#ifdef CONFIG_HIBERNATION
		if (strncmp(str, "s4_nohwsig", 10) == 0)
			acpi_no_s4_hw_signature();
#endif
		if (strncmp(str, "nonvs", 5) == 0)
			acpi_nvs_nosave();
		if (strncmp(str, "nonvs_s3", 8) == 0)
			acpi_nvs_nosave_s3();
		if (strncmp(str, "old_ordering", 12) == 0)
			acpi_old_suspend_ordering();
		str = strchr(str, ',');
		if (str != NULL)
			str += strspn(str, ", \t");
	}
	return 1;
}


Contributors
PersonTokensPropCommitsCommitProp
andi kleenandi kleen8649.14%114.29%


rafael j. wysockirafael j. wysocki3419.43%342.86%


pavel machekpavel machek2011.43%114.29%


li shaohuali shaohua1910.86%114.29%


kristen carlson accardikristen carlson accardi169.14%114.29%


Total175100.00%7100.00%



__setup("acpi_sleep=", acpi_sleep_setup);

Overall Contributors
PersonTokensPropCommitsCommitProp
pavel machekpavel machek16528.80%49.52%


andi kleenandi kleen12321.47%37.14%


h. peter anvinh. peter anvin7913.79%716.67%


rafael j. wysockirafael j. wysocki549.42%511.90%


kees cookkees cook325.58%12.38%


li shaohuali shaohua223.84%24.76%


lv zhenglv zheng162.79%12.38%


kristen carlson accardikristen carlson accardi162.79%12.38%


jarkko sakkinenjarkko sakkinen122.09%37.14%


todd e brandttodd e brandt101.75%12.38%


marcin slusarzmarcin slusarz101.75%12.38%


tejun heotejun heo81.40%24.76%


borislav petkovborislav petkov61.05%12.38%


matt mackallmatt mackall50.87%24.76%


ingo molnaringo molnar50.87%12.38%


konrad rzeszutek wilkkonrad rzeszutek wilk30.52%24.76%


yinghai luyinghai lu30.52%12.38%


josh poimboeufjosh poimboeuf10.17%12.38%


alexander duyckalexander duyck10.17%12.38%


jaswinder singh rajputjaswinder singh rajput10.17%12.38%


andy lutomirskiandy lutomirski10.17%12.38%


Total573100.00%42100.00%


Directory: arch/x86/kernel/acpi



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