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1903 jermar 1
/*
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 * Copyright (c) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup sparc64
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 * @{
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 */
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/** @file
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 */
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#include <smp/smp.h>
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#include <genarch/ofw/ofw_tree.h>
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#include <cpu.h>
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#include <arch/cpu.h>
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#include <arch.h>
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#include <config.h>
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#include <macros.h>
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#include <arch/types.h>
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#include <synch/synch.h>
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#include <synch/waitq.h>
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#include <print.h>
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/**
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 * This global variable is used to pick-up application processors
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 * from their active loop in start.S. When a processor looping in
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 * start.S sees that this variable contains its MID, it can
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 * proceed with its initialization.
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 *
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 * This variable is modified only by the bootstrap processor.
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 * Other processors access it read-only.
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 */
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volatile uint64_t waking_up_mid = (uint64_t) -1;
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/** Determine number of processors. */
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void smp_init(void)
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{
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    ofw_tree_node_t *node;
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    count_t cnt = 0;
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    node = ofw_tree_find_child_by_device_type(ofw_tree_lookup("/"), "cpu");
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    while (node) {
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        cnt++;
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        node = ofw_tree_find_peer_by_device_type(node, "cpu");
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    }
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    config.cpu_count = max(1, cnt);
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}
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/** Wake application processors up. */
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void kmp(void *arg)
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{
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    ofw_tree_node_t *node;
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    int i;
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    node = ofw_tree_find_child_by_device_type(ofw_tree_lookup("/"), "cpu");
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    for (i = 0; node; node = ofw_tree_find_peer_by_device_type(node, "cpu"), i++) {
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        uint32_t mid;
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        ofw_tree_property_t *prop;
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        prop = ofw_tree_getprop(node, "upa-portid");
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        if (!prop || !prop->value)
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            continue;
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        mid = *((uint32_t *) prop->value);
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        if (CPU->arch.mid == mid) {
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            /*
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             * Skip the current CPU.
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             */
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            continue;
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        }
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        /*
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         * Processor with ID == mid can proceed with its initialization.
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         */
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        waking_up_mid = mid;
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        if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT)
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            printf("%s: waiting for processor (mid = %" PRIu32 ") timed out\n",
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                __func__, mid);
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    }
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}
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/** @}
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 */