source: mainline/kernel/arch/ia64/src/smp/smp.c@ c8bf88d

/*
 * Copyright (c) 2005 Jakub Vana
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup ia64
 * @{
 */
/** @file
 */

#include <arch.h>
#include <arch/ski/ski.h>
#include <arch/drivers/it.h>
#include <arch/interrupt.h>
#include <arch/barrier.h>
#include <arch/asm.h>
#include <arch/register.h>
#include <arch/types.h>
#include <arch/context.h>
#include <arch/stack.h>
#include <arch/mm/page.h>
#include <mm/as.h>
#include <config.h>
#include <userspace.h>
#include <console/console.h>
#include <proc/uarg.h>
#include <syscall/syscall.h>
#include <ddi/irq.h>
#include <ddi/device.h>
#include <arch/bootinfo.h>
#include <smp/smp.h>
#include <smp/ipi.h>
#include <arch/atomic.h>
#include <panic.h>
#include <print.h>

#ifdef CONFIG_SMP

extern char cpu_by_id_eid_list[256][256];

static void sapic_init(void)
{
        bootinfo->sapic = (unative_t *)(PA2KA((unative_t)(bootinfo->sapic)) |
            FW_OFFSET);
}

static void ipi_broadcast_arch_all(int ipi)
{
        int id, eid;
        int myid, myeid;
        
        myid = ia64_get_cpu_id();
        myeid = ia64_get_cpu_eid();
        
        for (id = 0; id < 256; id++)
                for (eid = 0; eid < 256; eid++)
                        if ((id != myid) || (eid != myeid))
                                ipi_send_ipi(id, eid, ipi);
}

void ipi_broadcast_arch(int ipi )
{
        int id, eid;
        int myid, myeid;
        
        myid = ia64_get_cpu_id();
        myeid = ia64_get_cpu_eid();

        for (id = 0; id < 256; id++)
                for (eid = 0; eid < 256; eid++)
                        if ((id != myid) || (eid != myeid))
                                if (cpu_by_id_eid_list[id][eid])
                                        ipi_send_ipi(id, eid, ipi);
}

void smp_init(void)
{
        if (!bootinfo->hello_configured)
                return; 
        
        /*
         * If we have not got system prepared by hello, we are not able to start
         * AP's. This means we are running on a simulator.
         */
        
        sapic_init();
        ipi_broadcast_arch_all(bootinfo->wakeup_intno); 
        volatile long long brk;
        for (brk = 0; brk < 100LL * 1024LL * 1024LL; brk++)
                ;       /* wait a while before CPUs starts */

        config.cpu_count = 0;
        int id, eid;
        
        for (id = 0; id < 256; id++)
                for (eid = 0; eid < 256; eid++)
                        if (cpu_by_id_eid_list[id][eid] == 1) {
                                config.cpu_count++;
                                cpu_by_id_eid_list[id][eid] = 2;
                        }
}

void kmp(void *arg __attribute__((unused)))
{
        int id, eid;
        int myid, myeid;
        
        myid = ia64_get_cpu_id();
        myeid = ia64_get_cpu_eid();

        for (id = 0; id < 256; id++)
                for (eid = 0; eid < 256; eid++)
                        if ((id != myid) || (eid != myeid))
                                if (cpu_by_id_eid_list[id][eid] != 0) {
                                        if (cpu_by_id_eid_list[id][eid] == 1) {
                                                printf("Found Late CPU ID:%d "
                                                    "EDI:%d Not added to "
                                                    "system!!!\n", id, eid);
                                                continue;
                                        }
                                        cpu_by_id_eid_list[id][eid] = 3;
                                        /*
                                         * There may be just one AP being
                                         * initialized at the time. After
                                         * it comes completely up, it is
                                         * supposed to wake us up.
                                         */
                                        if (waitq_sleep_timeout(
                                            &ap_completion_wq, 1000000,
                                            SYNCH_FLAGS_NONE) ==
                                            ESYNCH_TIMEOUT) {
                                                printf("%s: waiting for cpu "
                                                    "ID:%d EID:%d timed out\n",
                                                    __FUNCTION__, id, eid);
                                            }
                                }
}

#endif

/** @}
 */