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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup sparc64
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <smp/smp.h>
  36. #include <genarch/ofw/ofw_tree.h>
  37. #include <cpu.h>
  38. #include <arch/cpu_family.h>
  39. #include <arch/cpu.h>
  40. #include <arch.h>
  41. #include <config.h>
  42. #include <macros.h>
  43. #include <arch/types.h>
  44. #include <synch/synch.h>
  45. #include <synch/waitq.h>
  46. #include <print.h>
  47. #include <arch/cpu_node.h>
  48.  
  49. /**
  50.  * This global variable is used to pick-up application processors
  51.  * from their active loop in start.S. When a processor looping in
  52.  * start.S sees that this variable contains its MID, it can
  53.  * proceed with its initialization.
  54.  *
  55.  * This variable is modified only by the bootstrap processor.
  56.  * Other processors access it read-only.
  57.  */
  58. volatile uint64_t waking_up_mid = (uint64_t) -1;
  59.  
  60. /** Determine number of processors. */
  61. void smp_init(void)
  62. {
  63.     ofw_tree_node_t *node;
  64.     count_t cnt = 0;
  65.    
  66.     if (is_us() || is_us_iii()) {
  67.         node = ofw_tree_find_child_by_device_type(cpus_parent(), "cpu");
  68.         while (node) {
  69.             cnt++;
  70.             node = ofw_tree_find_peer_by_device_type(node, "cpu");
  71.         }
  72.     } else if (is_us_iv()) {
  73.         node = ofw_tree_find_child(cpus_parent(), "cmp");
  74.         while (node) {
  75.             cnt += 2;
  76.             node = ofw_tree_find_peer_by_name(node, "cmp");
  77.         }
  78.     }
  79.    
  80.     config.cpu_count = max(1, cnt);
  81. }
  82.  
  83. /**
  84.  * Wakes up the CPU which is represented by the "node" OFW tree node.
  85.  * If "node" represents the current CPU, calling the function has
  86.  * no effect.
  87.  */
  88. static void wakeup_cpu(ofw_tree_node_t *node)
  89. {
  90.     uint32_t mid;
  91.     ofw_tree_property_t *prop;
  92.        
  93.     /* 'upa-portid' for US, 'portid' for US-III, 'cpuid' for US-IV */
  94.     prop = ofw_tree_getprop(node, "upa-portid");
  95.     if ((!prop) || (!prop->value))
  96.         prop = ofw_tree_getprop(node, "portid");
  97.     if ((!prop) || (!prop->value))
  98.         prop = ofw_tree_getprop(node, "cpuid");
  99.        
  100.     if (!prop || prop->value == NULL)
  101.         return;
  102.        
  103.     mid = *((uint32_t *) prop->value);
  104.     if (CPU->arch.mid == mid)
  105.         return;
  106.  
  107.     waking_up_mid = mid;
  108.        
  109.     if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_FLAGS_NONE) ==
  110.         ESYNCH_TIMEOUT)
  111.         printf("%s: waiting for processor (mid = %" PRIu32
  112.             ") timed out\n", __func__, mid);
  113. }
  114.  
  115. /** Wake application processors up. */
  116. void kmp(void *arg)
  117. {
  118.     ofw_tree_node_t *node;
  119.     int i;
  120.    
  121.     if (is_us() || is_us_iii()) {
  122.         node = ofw_tree_find_child_by_device_type(cpus_parent(), "cpu");
  123.         for (i = 0; node;
  124.                      node = ofw_tree_find_peer_by_device_type(node, "cpu"), i++)
  125.             wakeup_cpu(node);
  126.     } else if (is_us_iv()) {
  127.         node = ofw_tree_find_child(cpus_parent(), "cmp");
  128.         while (node) {
  129.             wakeup_cpu(ofw_tree_find_child(node, "cpu@0"));
  130.             wakeup_cpu(ofw_tree_find_child(node, "cpu@1"));
  131.             node = ofw_tree_find_peer_by_name(node, "cmp");
  132.         }
  133.     }
  134. }
  135.  
  136. /** @}
  137.  */
  138.