/*
* Copyright (c) 2006 Jakub Jermar
* 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 kernel_sparc64
* @{
*/
/** @file
*/
#include <smp/smp.h>
#include <genarch/ofw/ofw_tree.h>
#include <cpu.h>
#include <arch/cpu_family.h>
#include <arch/cpu.h>
#include <arch.h>
#include <config.h>
#include <macros.h>
#include <stdint.h>
#include <synch/waitq.h>
#include <log.h>
#include <arch/cpu_node.h>
/**
* This global variable is used to pick-up application processors
* from their active loop in start.S. When a processor looping in
* start.S sees that this variable contains its MID, it can
* proceed with its initialization.
*
* This variable is modified only by the bootstrap processor.
* Other processors access it read-only.
*/
volatile uint64_t waking_up_mid = (uint64_t) -1;
/** Determine number of processors. */
void smp_init(void)
{
ofw_tree_node_t *node;
unsigned int cnt = 0;
if (is_us() || is_us_iii()) {
node = ofw_tree_find_child_by_device_type(cpus_parent(), "cpu");
while (node) {
cnt++;
node = ofw_tree_find_peer_by_device_type(node, "cpu");
}
} else if (is_us_iv()) {
node = ofw_tree_find_child(cpus_parent(), "cmp");
while (node) {
cnt += 2;
node = ofw_tree_find_peer_by_name(node, "cmp");
}
}
config.cpu_count = max(1, cnt);
}
/**
* Wakes up the CPU which is represented by the "node" OFW tree node.
* If "node" represents the current CPU, calling the function has
* no effect.
*/
static void wakeup_cpu(ofw_tree_node_t *node)
{
uint32_t mid;
ofw_tree_property_t *prop;
/* 'upa-portid' for US, 'portid' for US-III, 'cpuid' for US-IV */
prop = ofw_tree_getprop(node, "upa-portid");
if ((!prop) || (!prop->value))
prop = ofw_tree_getprop(node, "portid");
if ((!prop) || (!prop->value))
prop = ofw_tree_getprop(node, "cpuid");
if (!prop || prop->value == NULL)
return;
mid = *((uint32_t *) prop->value);
if (CPU->arch.mid == mid)
return;
waking_up_mid = mid;
if (semaphore_down_timeout(&ap_completion_semaphore, 1000000) != EOK)
log(LF_ARCH, LVL_NOTE, "%s: waiting for processor (mid = %" PRIu32
") timed out", __func__, mid);
}
/** Wake application processors up. */
void kmp(void *arg)
{
ofw_tree_node_t *node;
int i;
if (is_us() || is_us_iii()) {
node = ofw_tree_find_child_by_device_type(cpus_parent(), "cpu");
for (i = 0; node;
node = ofw_tree_find_peer_by_device_type(node, "cpu"), i++)
wakeup_cpu(node);
} else if (is_us_iv()) {
node = ofw_tree_find_child(cpus_parent(), "cmp");
while (node) {
wakeup_cpu(ofw_tree_find_child(node, "cpu@0"));
wakeup_cpu(ofw_tree_find_child(node, "cpu@1"));
node = ofw_tree_find_peer_by_name(node, "cmp");
}
}
}
/** @}
*/