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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.h>
  39. #include <arch.h>
  40. #include <config.h>
  41. #include <macros.h>
  42. #include <arch/types.h>
  43. #include <synch/synch.h>
  44. #include <synch/waitq.h>
  45. #include <print.h>
  46.  
  47. /**
  48.  * This global variable is used to pick-up application processors
  49.  * from their active loop in start.S. When a processor looping in
  50.  * start.S sees that this variable contains its MID, it can
  51.  * proceed with its initialization.
  52.  *
  53.  * This variable is modified only by the bootstrap processor.
  54.  * Other processors access it read-only.
  55.  */
  56. volatile uint64_t waking_up_mid = (uint64_t) -1;
  57.  
  58. /** Determine number of processors. */
  59. void smp_init(void)
  60. {
  61.     ofw_tree_node_t *node;
  62.     count_t cnt = 0;
  63.    
  64.     node = ofw_tree_find_child_by_device_type(ofw_tree_lookup("/"), "cpu");
  65.     while (node) {
  66.         cnt++;
  67.         node = ofw_tree_find_peer_by_device_type(node, "cpu");
  68.     }
  69.    
  70.     config.cpu_count = max(1, cnt);
  71. }
  72.  
  73. /** Wake application processors up. */
  74. void kmp(void *arg)
  75. {
  76.     ofw_tree_node_t *node;
  77.     int i;
  78.    
  79.     node = ofw_tree_find_child_by_device_type(ofw_tree_lookup("/"), "cpu");
  80.     for (i = 0; node; node = ofw_tree_find_peer_by_device_type(node, "cpu"), i++) {
  81.         uint32_t mid;
  82.         ofw_tree_property_t *prop;
  83.        
  84.         prop = ofw_tree_getprop(node, "upa-portid");
  85.         if (!prop || !prop->value)
  86.             continue;
  87.        
  88.         mid = *((uint32_t *) prop->value);
  89.         if (CPU->arch.mid == mid) {
  90.             /*
  91.              * Skip the current CPU.
  92.              */
  93.             continue;
  94.         }
  95.  
  96.         /*
  97.          * Processor with ID == mid can proceed with its initialization.
  98.          */
  99.         waking_up_mid = mid;
  100.        
  101.         if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT)
  102.             printf("%s: waiting for processor (mid = %d) timed out\n",
  103.                 __func__, mid);
  104.     }
  105. }
  106.  
  107. /** @}
  108.  */
  109.