suspend.c

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#include <linux/types.h>
#include <linux/clockchips.h>

#include <xen/interface/xen.h>
#include <xen/grant_table.h>
#include <xen/events.h>

#include <asm/xen/hypercall.h>
#include <asm/xen/page.h>
#include <asm/fixmap.h>

#include "xen-ops.h"
#include "mmu.h"

void xen_arch_pre_suspend(void)
{
    xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
    xen_start_info->console.domU.mfn =
        mfn_to_pfn(xen_start_info->console.domU.mfn);

    BUG_ON(!irqs_disabled());

    HYPERVISOR_shared_info = &xen_dummy_shared_info;
    if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
                     __pte_ma(0), 0))
        BUG();
}

void xen_arch_hvm_post_suspend(int suspend_cancelled)
{
#ifdef CONFIG_XEN_PVHVM
    int cpu;
    xen_hvm_init_shared_info();
    xen_callback_vector();
    xen_unplug_emulated_devices();
    if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
        for_each_online_cpu(cpu) {
            xen_setup_runstate_info(cpu);
        }
    }
#endif
}

void xen_arch_post_suspend(int suspend_cancelled)
{
    xen_build_mfn_list_list();

    xen_setup_shared_info();

    if (suspend_cancelled) {
        xen_start_info->store_mfn =
            pfn_to_mfn(xen_start_info->store_mfn);
        xen_start_info->console.domU.mfn =
            pfn_to_mfn(xen_start_info->console.domU.mfn);
    } else {
#ifdef CONFIG_SMP
        BUG_ON(xen_cpu_initialized_map == NULL);
        cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
#endif
        xen_vcpu_restore();
    }

}

static void xen_vcpu_notify_restore(void *data)
{
    unsigned long reason = (unsigned long)data;

    /* Boot processor notified via generic timekeeping_resume() */
    if ( smp_processor_id() == 0)
        return;

    clockevents_notify(reason, NULL);
}

void xen_arch_resume(void)
{
    on_each_cpu(xen_vcpu_notify_restore,
            (void *)CLOCK_EVT_NOTIFY_RESUME, 1);
}