C++ HYPERVISOR_sched_op函数代码示例

void minios_do_halt(int reason)
{
    minios_printk("minios: halting, reason=%d\n", reason);
    for( ;; )
    {
        struct sched_shutdown sched_shutdown = {
            .reason = (reason == MINIOS_HALT_POWEROFF) ?
                SHUTDOWN_poweroff : SHUTDOWN_crash };
        HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
    }
}

/*
 * do_exit: This is called whenever an IRET fails in entry.S.
 * This will generally be because an application has got itself into
 * a really bad state (probably a bad CS or SS). It must be killed.
 * Of course, minimal OS doesn't have applications :-)
 */

void minios_do_exit(void)
{
    minios_printk("Do_exit called!\n");
    stack_walk();
    for( ;; )
    {
        struct sched_shutdown sched_shutdown = { .reason = SHUTDOWN_crash };
        HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
    }
}

void do_page_fault(struct pt_regs *regs, unsigned long error_code)
{
    unsigned long addr = read_cr2();
    struct sched_shutdown sched_shutdown = { .reason = SHUTDOWN_crash };

    if ((error_code & TRAP_PF_WRITE) && handle_cow(addr))
	return;

    /* If we are already handling a page fault, and got another one
       that means we faulted in pagetable walk. Continuing here would cause
       a recursive fault */       
    if(handling_pg_fault == 1) 
    {
        printk("Page fault in pagetable walk (access to invalid memory?).\n"); 
        HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
    }
    handling_pg_fault++;
    barrier();

    printk("Page fault at linear address %p, rip %p, regs %p, sp %p, our_sp %p, code %lx\n",
           addr, regs->rip, regs, regs->rsp, &addr, error_code);

    dump_regs(regs);
    //do_stack_walk(regs->rbp);
    dump_mem(regs->rsp);
    dump_mem(regs->rbp);
    dump_mem(regs->rip);
    page_walk(addr);
    HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
    /* We should never get here ... but still */
    handling_pg_fault--;
}

static int xen_pv_cpu_up(unsigned int cpu, struct task_struct *idle)
{
	int rc;

	common_cpu_up(cpu, idle);

	xen_setup_runstate_info(cpu);

	/*
	 * PV VCPUs are always successfully taken down (see 'while' loop
	 * in xen_cpu_die()), so -EBUSY is an error.
	 */
	rc = cpu_check_up_prepare(cpu);
	if (rc)
		return rc;

	/* make sure interrupts start blocked */
	per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;

	rc = cpu_initialize_context(cpu, idle);
	if (rc)
		return rc;

	xen_pmu_init(cpu);

	rc = HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL);
	BUG_ON(rc);

	while (cpu_report_state(cpu) != CPU_ONLINE)
		HYPERVISOR_sched_op(SCHEDOP_yield, NULL);

	return 0;
}

static int
privcmd_HYPERVISOR_sched_op(int cmd, void *arg)
{
	int error;
	int size = 0;
	import_export_t op_ie;
	struct sched_remote_shutdown op;

	switch (cmd) {
	case SCHEDOP_remote_shutdown:
		size = sizeof (struct sched_remote_shutdown);
		break;
	default:
#ifdef DEBUG
		printf("unrecognized sched op 0x%x\n", cmd);
#endif
		return (-X_EINVAL);
	}

	error = import_buffer(&op_ie, arg, &op, size, IE_IMPORT);
	if (error == 0)
		error = HYPERVISOR_sched_op(cmd, (arg == NULL) ? NULL : &op);
	export_buffer(&op_ie, &error);

	return (error);
}

static void xen_reboot(int reason)
{
	struct sched_shutdown r = { .reason = reason };

	if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
		BUG();
}

static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
{
	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
	int rc;
	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
	BUG_ON(rc);
}

static void xen_power_off(void)
{
	struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
	int rc;
	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
	BUG_ON(rc);
}

void block_domain(u32 millisecs)
{
    struct timeval tv;
    gettimeofday(&tv);
    HYPERVISOR_set_timer_op(monotonic_clock() + 1000000LL * (s64) millisecs);
    HYPERVISOR_sched_op(SCHEDOP_block, 0);
}

CAMLprim value
stub_sched_shutdown(value v_reason)
{
    CAMLparam1(v_reason);
    struct sched_shutdown sched_shutdown = { .reason = reasons[Int_val(v_reason)] };
    HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
    CAMLreturn(Val_unit);
}

void __attribute__ ((noreturn)) grub_reboot (void)
{
    for ( ;; )
    {
        struct sched_shutdown sched_shutdown = { .reason = SHUTDOWN_reboot };
        HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
    }
}

static void xen_restart(char str, const char *cmd)
{
	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
	int rc;
	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
	if (rc)
		BUG();
}

void domain_poweroff(void)
{
	printk("\nBye\n");
	console_done();	// flushes and restores terminal mode

	struct sched_shutdown op;
	op.reason = SHUTDOWN_poweroff;
	HYPERVISOR_sched_op(SCHEDOP_shutdown, &op);
}

void do_exit(void)
{
    printk("Do_exit called!\n");
    arch_do_exit();
    for( ;; )
    {
        struct sched_shutdown sched_shutdown = { .reason = SHUTDOWN_crash };
        HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
    }
}

static void xen_reboot(int reason)
{
	struct sched_shutdown r = { .reason = reason };

#ifdef CONFIG_SMP
	smp_send_stop();
#endif

	if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
		BUG();
}

void xen_reboot(int reason)
{
	struct sched_shutdown r = { .reason = reason };
	int cpu;

	for_each_online_cpu(cpu)
		xen_pmu_finish(cpu);

	if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
		BUG();
}