ip27-init.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

}

static volatile cpumask_t boot_barrier;

void __init start_secondary(void)
{
	CPUMASK_CLRB(boot_barrier, getcpuid());	/* needs atomicity */
	per_cpu_init();
	per_cpu_trap_init();
#if 0
	ecc_init();
	bte_lateinit();
	init_mfhi_war();
#endif
	local_flush_tlb_all();
	flush_cache_l1();
	flush_cache_l2();
	start_secondary();
}

__init void allowboot(void)
{
	int		num_cpus = 0;
	cpuid_t		cpu, mycpuid = getcpuid();
	cnodeid_t	cnode;
	extern void	smp_bootstrap(void);

	sn_mp_setup();
	/* Master has already done per_cpu_init() */
	install_cpuintr(smp_processor_id());
#if 0
	bte_lateinit();
	ecc_init();
#endif

	replicate_kernel_text(numnodes);
	boot_barrier = boot_cpumask;
	/* Launch slaves. */
	for (cpu = 0; cpu < maxcpus; cpu++) {
		if (cpu == mycpuid) {
			alloc_cpupda(cpu, num_cpus);
			num_cpus++;
			/* We're already started, clear our bit */
			CPUMASK_CLRB(boot_barrier, cpu);
			continue;
		}

		/* Skip holes in CPU space */
		if (CPUMASK_TSTB(boot_cpumask, cpu)) {
			struct task_struct *p;

			/*
			 * The following code is purely to make sure
			 * Linux can schedule processes on this slave.
			 */
			kernel_thread(0, NULL, CLONE_PID);
			p = init_task.prev_task;
			sprintf(p->comm, "%s%d", "Idle", num_cpus);
			init_tasks[num_cpus] = p;
			alloc_cpupda(cpu, num_cpus);
			del_from_runqueue(p);
			p->processor = num_cpus;
			p->cpus_runnable = 1 << num_cpus; /* we schedule the first task manually */
			unhash_process(p);
			/* Attach to the address space of init_task. */
			atomic_inc(&init_mm.mm_count);
			p->active_mm = &init_mm;

			/*
		 	 * Launch a slave into smp_bootstrap().
		 	 * It doesn't take an argument, and we
			 * set sp to the kernel stack of the newly
			 * created idle process, gp to the proc struct
			 * (so that current-> works).
		 	 */
			LAUNCH_SLAVE(cputonasid(num_cpus),cputoslice(num_cpus),
				(launch_proc_t)MAPPED_KERN_RW_TO_K0(smp_bootstrap),
				0, (void *)((unsigned long)p +
				KERNEL_STACK_SIZE - 32), (void *)p);

			/*
			 * Now optimistically set the mapping arrays. We
			 * need to wait here, verify the cpu booted up, then
			 * fire up the next cpu.
			 */
			__cpu_number_map[cpu] = num_cpus;
			__cpu_logical_map[num_cpus] = cpu;
			CPUMASK_SETB(cpu_online_map, cpu);
			num_cpus++;
			/*
			 * Wait this cpu to start up and initialize its hub,
			 * and discover the io devices it will control.
			 *
			 * XXX: We really want to fire up launch all the CPUs
			 * at once.  We have to preserve the order of the
			 * devices on the bridges first though.
			 */
			while(atomic_read(&numstarted) != num_cpus);
		}
	}


#ifdef LATER
	Wait logic goes here.
#endif
	for (cnode = 0; cnode < numnodes; cnode++) {
#if 0
		if (cnodetocpu(cnode) == -1) {
			printk("Initializing headless hub,cnode %d", cnode);
			per_hub_init(cnode);
		}
#endif
	}
#if 0
	cpu_io_setup();
	init_mfhi_war();
#endif
	smp_num_cpus = num_cpus;
}

void __init smp_boot_cpus(void)
{
	extern void allowboot(void);

	init_new_context(current, &init_mm);
	current->processor = 0;
	init_idle();
	smp_tune_scheduling();
	allowboot();
}

#else /* CONFIG_SMP */
void __init start_secondary(void)
{
	/* XXX Why do we need this empty definition at all?  */
}
#endif /* CONFIG_SMP */


#define	rou_rflag	rou_flags

void
router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
{
	klrou_t *router;
	lboard_t *brd;
	int	port;

	if (router_a->rou_rflag == 1)
		return;

	if (depth >= router_distance)
		return;

	router_a->rou_rflag = 1;

	for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
		if (router_a->rou_port[port].port_nasid == INVALID_NASID)
			continue;

		brd = (lboard_t *)NODE_OFFSET_TO_K0(
			router_a->rou_port[port].port_nasid,
			router_a->rou_port[port].port_offset);

		if (brd->brd_type == KLTYPE_ROUTER) {
			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
			if (router == router_b) {
				if (depth < router_distance)
					router_distance = depth;
			}
			else
				router_recurse(router, router_b, depth + 1);
		}
	}

	router_a->rou_rflag = 0;
}

int
node_distance(nasid_t nasid_a, nasid_t nasid_b)
{
	nasid_t nasid;
	cnodeid_t cnode;
	lboard_t *brd, *dest_brd;
	int port;
	klrou_t *router, *router_a = NULL, *router_b = NULL;

	/* Figure out which routers nodes in question are connected to */
	for (cnode = 0; cnode < numnodes; cnode++) {
		nasid = COMPACT_TO_NASID_NODEID(cnode);

		if (nasid == -1) continue;

		brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
					KLTYPE_ROUTER);

		if (!brd)
			continue;

		do {
			if (brd->brd_flags & DUPLICATE_BOARD)
				continue;

			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
			router->rou_rflag = 0;

			for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
				if (router->rou_port[port].port_nasid == INVALID_NASID)
					continue;

				dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
					router->rou_port[port].port_nasid,
					router->rou_port[port].port_offset);

				if (dest_brd->brd_type == KLTYPE_IP27) {
					if (dest_brd->brd_nasid == nasid_a)
						router_a = router;
					if (dest_brd->brd_nasid == nasid_b)
						router_b = router;
				}
			}

		} while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
	}

	if (router_a == NULL) {
		printk("node_distance: router_a NULL\n");
		return -1;
	}
	if (router_b == NULL) {
		printk("node_distance: router_b NULL\n");
		return -1;
	}

	if (nasid_a == nasid_b)
		return 0;

	if (router_a == router_b)
		return 1;

	router_distance = 100;
	router_recurse(router_a, router_b, 2);

	return router_distance;
}

void
init_topology_matrix(void)
{
	nasid_t nasid, nasid2;
	cnodeid_t row, col;

	for (row = 0; row < MAX_COMPACT_NODES; row++)
		for (col = 0; col < MAX_COMPACT_NODES; col++)
			node_distances[row][col] = -1;

	for (row = 0; row < numnodes; row++) {
		nasid = COMPACT_TO_NASID_NODEID(row);
		for (col = 0; col < numnodes; col++) {
			nasid2 = COMPACT_TO_NASID_NODEID(col);
			node_distances[row][col] = node_distance(nasid, nasid2);
		}
	}
}

void
dump_topology(void)
{
	nasid_t nasid;
	cnodeid_t cnode;
	lboard_t *brd, *dest_brd;
	int port;
	int router_num = 0;
	klrou_t *router;
	cnodeid_t row, col;

	printk("************** Topology ********************\n");

	printk("    ");
	for (col = 0; col < numnodes; col++)
		printk("%02d ", col);
	printk("\n");
	for (row = 0; row < numnodes; row++) {
		printk("%02d  ", row);
		for (col = 0; col < numnodes; col++)
			printk("%2d ", node_distances[row][col]);
		printk("\n");
	}

	for (cnode = 0; cnode < numnodes; cnode++) {
		nasid = COMPACT_TO_NASID_NODEID(cnode);

		if (nasid == -1) continue;

		brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
					KLTYPE_ROUTER);

		if (!brd)
			continue;

		do {
			if (brd->brd_flags & DUPLICATE_BOARD)
				continue;
			printk("Router %d:", router_num);
			router_num++;

			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);

			for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
				if (router->rou_port[port].port_nasid == INVALID_NASID)
					continue;

				dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
					router->rou_port[port].port_nasid,
					router->rou_port[port].port_offset);

				if (dest_brd->brd_type == KLTYPE_IP27)
					printk(" %d", dest_brd->brd_nasid);
				if (dest_brd->brd_type == KLTYPE_ROUTER)
					printk(" r");
			}
			printk("\n");

		} while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
	}
}

#if 0
#define		brd_widgetnum	brd_slot
#define NODE_OFFSET_TO_KLINFO(n,off)    ((klinfo_t*) TO_NODE_CAC(n,off))
void
dump_klcfg(void)
{
	cnodeid_t       cnode;
	int i;
	nasid_t         nasid;
	lboard_t        *lbptr;
	gda_t           *gdap;

	gdap = (gda_t *)GDA_ADDR(get_nasid());
	if (gdap->g_magic != GDA_MAGIC) {
		printk("dumpklcfg_cmd: Invalid GDA MAGIC\n");
		return;
	}

	for (cnode = 0; cnode < MAX_COMPACT_NODES; cnode ++) {
		nasid = gdap->g_nasidtable[cnode];

		if (nasid == INVALID_NASID)
			continue;

		printk("\nDumpping klconfig Nasid %d:\n", nasid);

		lbptr = KL_CONFIG_INFO(nasid);

		while (lbptr) {
			printk("    %s, Nasid %d, Module %d, widget 0x%x, partition %d, NIC 0x%x lboard 0x%lx",
				"board name here", /* BOARD_NAME(lbptr->brd_type), */
				lbptr->brd_nasid, lbptr->brd_module,
				lbptr->brd_widgetnum,
				lbptr->brd_partition,
				(lbptr->brd_nic), lbptr);
			if (lbptr->brd_flags & DUPLICATE_BOARD)
				printk(" -D");
			printk("\n");
			for (i = 0; i < lbptr->brd_numcompts; i++) {
				klinfo_t *kli;
				kli = NODE_OFFSET_TO_KLINFO(NASID_GET(lbptr), lbptr->brd_compts[i]);
				printk("        type %2d, flags 0x%04x, diagval %3d, physid %4d, virtid %2d: %s\n",
					kli->struct_type,
					kli->flags,
					kli->diagval,
					kli->physid,
					kli->virtid,
					"comp. name here");
					/* COMPONENT_NAME(kli->struct_type)); */
			}
			lbptr = KLCF_NEXT(lbptr);
		}
	}
	printk("\n");

	/* Useful to print router maps also */

	for (cnode = 0; cnode < MAX_COMPACT_NODES; cnode ++) {
		klrou_t *kr;
		int i;

        	nasid = gdap->g_nasidtable[cnode];
        	if (nasid == INVALID_NASID)
            		continue;
        	lbptr = KL_CONFIG_INFO(nasid);

        	while (lbptr) {

			lbptr = find_lboard_class(lbptr, KLCLASS_ROUTER);
			if(!lbptr)
				break;
			if (!KL_CONFIG_DUPLICATE_BOARD(lbptr)) {
				printk("%llx -> \n", lbptr->brd_nic);
				kr = (klrou_t *)find_first_component(lbptr,
					KLSTRUCT_ROU);
				for (i = 1; i <= MAX_ROUTER_PORTS; i++) {
					printk("[%d, %llx]; ",
						kr->rou_port[i].port_nasid,
						kr->rou_port[i].port_offset);
				}
				printk("\n");
			}
			lbptr = KLCF_NEXT(lbptr);
        	}
        	printk("\n");
    	}

	dump_topology();
}
#endif