| 1 | /*
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| 2 | * Copyright (c) 2006 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup kernel_sparc64
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <smp/smp.h>
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| 36 | #include <genarch/ofw/ofw_tree.h>
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| 37 | #include <cpu.h>
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| 38 | #include <arch/cpu_family.h>
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| 39 | #include <arch/cpu.h>
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| 40 | #include <arch.h>
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| 41 | #include <config.h>
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| 42 | #include <macros.h>
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| 43 | #include <stdint.h>
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| 44 | #include <synch/waitq.h>
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| 45 | #include <log.h>
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| 46 | #include <arch/cpu_node.h>
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| 47 |
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| 48 | /**
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| 49 | * This global variable is used to pick-up application processors
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| 50 | * from their active loop in start.S. When a processor looping in
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| 51 | * start.S sees that this variable contains its MID, it can
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| 52 | * proceed with its initialization.
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| 53 | *
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| 54 | * This variable is modified only by the bootstrap processor.
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| 55 | * Other processors access it read-only.
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| 56 | */
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| 57 | volatile uint64_t waking_up_mid = (uint64_t) -1;
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| 58 |
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| 59 | /** Determine number of processors. */
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| 60 | void smp_init(void)
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| 61 | {
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| 62 | ofw_tree_node_t *node;
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| 63 | unsigned int cnt = 0;
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| 64 |
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| 65 | if (is_us() || is_us_iii()) {
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| 66 | node = ofw_tree_find_child_by_device_type(cpus_parent(), "cpu");
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| 67 | while (node) {
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| 68 | cnt++;
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| 69 | node = ofw_tree_find_peer_by_device_type(node, "cpu");
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| 70 | }
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| 71 | } else if (is_us_iv()) {
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| 72 | node = ofw_tree_find_child(cpus_parent(), "cmp");
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| 73 | while (node) {
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| 74 | cnt += 2;
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| 75 | node = ofw_tree_find_peer_by_name(node, "cmp");
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | config.cpu_count = max(1, cnt);
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| 80 | }
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| 81 |
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| 82 | /**
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| 83 | * Wakes up the CPU which is represented by the "node" OFW tree node.
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| 84 | * If "node" represents the current CPU, calling the function has
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| 85 | * no effect.
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| 86 | */
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| 87 | static void wakeup_cpu(ofw_tree_node_t *node)
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| 88 | {
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| 89 | uint32_t mid;
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| 90 | ofw_tree_property_t *prop;
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| 91 |
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| 92 | /* 'upa-portid' for US, 'portid' for US-III, 'cpuid' for US-IV */
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| 93 | prop = ofw_tree_getprop(node, "upa-portid");
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| 94 | if ((!prop) || (!prop->value))
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| 95 | prop = ofw_tree_getprop(node, "portid");
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| 96 | if ((!prop) || (!prop->value))
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| 97 | prop = ofw_tree_getprop(node, "cpuid");
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| 98 |
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| 99 | if (!prop || prop->value == NULL)
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| 100 | return;
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| 101 |
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| 102 | mid = *((uint32_t *) prop->value);
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| 103 | if (CPU->arch.mid == mid)
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| 104 | return;
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| 105 |
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| 106 | waking_up_mid = mid;
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| 107 |
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| 108 | if (waitq_sleep_timeout(&ap_completion_wq, 1000000,
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| 109 | SYNCH_FLAGS_NONE, NULL) == ETIMEOUT)
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| 110 | log(LF_ARCH, LVL_NOTE, "%s: waiting for processor (mid = %" PRIu32
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| 111 | ") timed out", __func__, mid);
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| 112 | }
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| 113 |
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| 114 | /** Wake application processors up. */
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| 115 | void kmp(void *arg)
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| 116 | {
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| 117 | ofw_tree_node_t *node;
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| 118 | int i;
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| 119 |
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| 120 | if (is_us() || is_us_iii()) {
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| 121 | node = ofw_tree_find_child_by_device_type(cpus_parent(), "cpu");
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| 122 | for (i = 0; node;
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| 123 | node = ofw_tree_find_peer_by_device_type(node, "cpu"), i++)
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| 124 | wakeup_cpu(node);
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| 125 | } else if (is_us_iv()) {
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| 126 | node = ofw_tree_find_child(cpus_parent(), "cmp");
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| 127 | while (node) {
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| 128 | wakeup_cpu(ofw_tree_find_child(node, "cpu@0"));
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| 129 | wakeup_cpu(ofw_tree_find_child(node, "cpu@1"));
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| 130 | node = ofw_tree_find_peer_by_name(node, "cmp");
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| 131 | }
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| 132 | }
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| 133 | }
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| 134 |
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| 135 | /** @}
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| 136 | */
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