Пример #1
0
void __stop_this_cpu(void)
{
    ASSERT(!local_irq_is_enabled());

    disable_local_APIC();

    hvm_cpu_down();

    /*
     * Clear FPU, zapping any pending exceptions. Needed for warm reset with
     * some BIOSes.
     */
    clts();
    asm volatile ( "fninit" );

    cpumask_clear_cpu(smp_processor_id(), &cpu_online_map);
}
Пример #2
0
/* Main interface to do xen specific suspend/resume */
static int enter_state(u32 state)
{
    unsigned long flags;
    int error;
    unsigned long cr4;

    if ( (state <= ACPI_STATE_S0) || (state > ACPI_S_STATES_MAX) )
        return -EINVAL;

    if ( !spin_trylock(&pm_lock) )
        return -EBUSY;

    BUG_ON(system_state != SYS_STATE_active);
    system_state = SYS_STATE_suspend;

    printk(XENLOG_INFO "Preparing system for ACPI S%d state.\n", state);

    freeze_domains();

    acpi_dmar_reinstate();

    if ( (error = disable_nonboot_cpus()) )
    {
        system_state = SYS_STATE_resume;
        goto enable_cpu;
    }

    cpufreq_del_cpu(0);

    hvm_cpu_down();

    acpi_sleep_prepare(state);

    console_start_sync();
    printk("Entering ACPI S%d state.\n", state);

    local_irq_save(flags);
    spin_debug_disable();

    if ( (error = device_power_down()) )
    {
        printk(XENLOG_ERR "Some devices failed to power down.");
        system_state = SYS_STATE_resume;
        goto done;
    }

    ACPI_FLUSH_CPU_CACHE();

    switch ( state )
    {
    case ACPI_STATE_S3:
        do_suspend_lowlevel();
        system_reset_counter++;
        error = tboot_s3_resume();
        break;
    case ACPI_STATE_S5:
        acpi_enter_sleep_state(ACPI_STATE_S5);
        break;
    default:
        error = -EINVAL;
        break;
    }

    system_state = SYS_STATE_resume;

    /* Restore CR4 and EFER from cached values. */
    cr4 = read_cr4();
    write_cr4(cr4 & ~X86_CR4_MCE);
    write_efer(read_efer());

    device_power_up();

    mcheck_init(&boot_cpu_data, 0);
    write_cr4(cr4);

    printk(XENLOG_INFO "Finishing wakeup from ACPI S%d state.\n", state);

    if ( (state == ACPI_STATE_S3) && error )
        tboot_s3_error(error);

 done:
    spin_debug_enable();
    local_irq_restore(flags);
    console_end_sync();
    acpi_sleep_post(state);
    if ( hvm_cpu_up() )
        BUG();

 enable_cpu:
    cpufreq_add_cpu(0);
    microcode_resume_cpu(0);
    rcu_barrier();
    mtrr_aps_sync_begin();
    enable_nonboot_cpus();
    mtrr_aps_sync_end();
    adjust_vtd_irq_affinities();
    acpi_dmar_zap();
    thaw_domains();
    system_state = SYS_STATE_active;
    spin_unlock(&pm_lock);
    return error;
}
Пример #3
0
/* Main interface to do xen specific suspend/resume */
static int enter_state(u32 state)
{
    unsigned long flags;
    int error;

    if ( (state <= ACPI_STATE_S0) || (state > ACPI_S_STATES_MAX) )
        return -EINVAL;

    if ( !spin_trylock(&pm_lock) )
        return -EBUSY;

    printk(XENLOG_INFO "Preparing system for ACPI S%d state.", state);

    freeze_domains();

    disable_nonboot_cpus();
    if ( num_online_cpus() != 1 )
    {
        error = -EBUSY;
        goto enable_cpu;
    }

    cpufreq_del_cpu(0);

    hvm_cpu_down();

    acpi_sleep_prepare(state);

    console_start_sync();
    printk("Entering ACPI S%d state.\n", state);

    local_irq_save(flags);
    spin_debug_disable();

    if ( (error = device_power_down()) )
    {
        printk(XENLOG_ERR "Some devices failed to power down.");
        goto done;
    }

    ACPI_FLUSH_CPU_CACHE();

    switch ( state )
    {
    case ACPI_STATE_S3:
        do_suspend_lowlevel();
        system_reset_counter++;
        error = tboot_s3_resume();
        break;
    case ACPI_STATE_S5:
        acpi_enter_sleep_state(ACPI_STATE_S5);
        break;
    default:
        error = -EINVAL;
        break;
    }

    /* Restore CR4 and EFER from cached values. */
    write_cr4(read_cr4());
    if ( cpu_has_efer )
        write_efer(read_efer());

    device_power_up();

    printk(XENLOG_INFO "Finishing wakeup from ACPI S%d state.\n", state);

    if ( (state == ACPI_STATE_S3) && error )
        panic("Memory integrity was lost on resume (%d)\n", error);

 done:
    spin_debug_enable();
    local_irq_restore(flags);
    console_end_sync();
    acpi_sleep_post(state);
    if ( !hvm_cpu_up() )
        BUG();

 enable_cpu:
    cpufreq_add_cpu(0);
    microcode_resume_cpu(0);
    enable_nonboot_cpus();
    thaw_domains();
    spin_unlock(&pm_lock);
    return error;
}