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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 <typedefs.h>
  46. #include <print.h>
  47.  
  48. /**
  49.  * This global variable is used to pick-up application processors
  50.  * from their active loop in start.S. When a processor looping in
  51.  * start.S sees that this variable contains its MID, it can
  52.  * proceed with its initialization.
  53.  *
  54.  * This variable is modified only by the bootstrap processor.
  55.  * Other processors access it read-only.
  56.  */
  57. volatile uint64_t waking_up_mid = (uint64_t) -1;
  58.  
  59. /** Determine number of processors. */
  60. void smp_init(void)
  61. {
  62.     ofw_tree_node_t *node;
  63.     count_t cnt = 0;
  64.    
  65.     node = ofw_tree_find_child_by_device_type(ofw_tree_lookup("/"), "cpu");
  66.     while (node) {
  67.         cnt++;
  68.         node = ofw_tree_find_peer_by_device_type(node, "cpu");
  69.     }
  70.    
  71.     config.cpu_count = max(1, cnt);
  72. }
  73.  
  74. /** Wake application processors up. */
  75. void kmp(void *arg)
  76. {
  77.     ofw_tree_node_t *node;
  78.     int i;
  79.    
  80.     node = ofw_tree_find_child_by_device_type(ofw_tree_lookup("/"), "cpu");
  81.     for (i = 0; node; node = ofw_tree_find_peer_by_device_type(node, "cpu"), i++) {
  82.         uint32_t mid;
  83.         ofw_tree_property_t *prop;
  84.        
  85.         prop = ofw_tree_getprop(node, "upa-portid");
  86.         if (!prop || !prop->value)
  87.             continue;
  88.        
  89.         mid = *((uint32_t *) prop->value);
  90.         if (CPU->arch.mid == mid) {
  91.             /*
  92.              * Skip the current CPU.
  93.              */
  94.             continue;
  95.         }
  96.  
  97.         /*
  98.          * Processor with ID == mid can proceed with its initialization.
  99.          */
  100.         waking_up_mid = mid;
  101.        
  102.         if (waitq_sleep_timeout(&ap_completion_wq, 1000000, SYNCH_FLAGS_NONE) == ESYNCH_TIMEOUT)
  103.             printf("%s: waiting for processor (mid = %d) timed out\n",
  104.                 __FUNCTION__, mid);
  105.     }
  106. }
  107.  
  108. /** @}
  109.  */
  110.