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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/ipi.h>
  36. #include <cpu.h>
  37. #include <arch.h>
  38. #include <arch/cpu.h>
  39. #include <arch/asm.h>
  40. #include <config.h>
  41. #include <mm/tlb.h>
  42. #include <arch/interrupt.h>
  43. #include <arch/trap/interrupt.h>
  44. #include <arch/barrier.h>
  45. #include <preemption.h>
  46. #include <time/delay.h>
  47. #include <panic.h>
  48.  
  49. /** Set the contents of the outgoing interrupt vector data.
  50.  *
  51.  * The first data item (data 0) will be set to the value of func, the
  52.  * rest of the vector will contain zeros.
  53.  *
  54.  * This is a helper function used from within the cross_call function.
  55.  *
  56.  * @param func value the first data item of the vector will be set to
  57.  */
  58. static inline void set_intr_w_data(void (* func)(void))
  59. {
  60. #if defined (US)
  61.     asi_u64_write(ASI_INTR_W, ASI_UDB_INTR_W_DATA_0, (uintptr_t) func);
  62.     asi_u64_write(ASI_INTR_W, ASI_UDB_INTR_W_DATA_1, 0);
  63.     asi_u64_write(ASI_INTR_W, ASI_UDB_INTR_W_DATA_2, 0);
  64. #elif defined (US3)
  65.     asi_u64_write(ASI_INTR_W, VA_INTR_W_DATA_0, (uintptr_t) func);
  66.     asi_u64_write(ASI_INTR_W, VA_INTR_W_DATA_1, 0);
  67.     asi_u64_write(ASI_INTR_W, VA_INTR_W_DATA_2, 0);
  68.     asi_u64_write(ASI_INTR_W, VA_INTR_W_DATA_3, 0);
  69.     asi_u64_write(ASI_INTR_W, VA_INTR_W_DATA_4, 0);
  70.     asi_u64_write(ASI_INTR_W, VA_INTR_W_DATA_5, 0);
  71.     asi_u64_write(ASI_INTR_W, VA_INTR_W_DATA_6, 0);
  72.     asi_u64_write(ASI_INTR_W, VA_INTR_W_DATA_7, 0);
  73. #endif
  74. }
  75.  
  76. /** Invoke function on another processor.
  77.  *
  78.  * Currently, only functions without arguments are supported.
  79.  * Supporting more arguments in the future should be no big deal.
  80.  *
  81.  * Interrupts must be disabled prior to this call.
  82.  *
  83.  * @param mid MID of the target processor.
  84.  * @param func Function to be invoked.
  85.  */
  86. static void cross_call(int mid, void (* func)(void))
  87. {
  88.     uint64_t status;
  89.     bool done;
  90.  
  91.     /*
  92.      * This function might enable interrupts for a while.
  93.      * In order to prevent migration to another processor,
  94.      * we explicitly disable preemption.
  95.      */
  96.    
  97.     preemption_disable();
  98.    
  99.     status = asi_u64_read(ASI_INTR_DISPATCH_STATUS, 0);
  100.     if (status & INTR_DISPATCH_STATUS_BUSY)
  101.         panic("Interrupt Dispatch Status busy bit set.");
  102.    
  103.     ASSERT(!(pstate_read() & PSTATE_IE_BIT));
  104.    
  105.     do {
  106.         set_intr_w_data(func);
  107.         asi_u64_write(ASI_INTR_W,
  108.             (mid << INTR_VEC_DISPATCH_MID_SHIFT) |
  109.             VA_INTR_W_DISPATCH, 0);
  110.    
  111.         membar();
  112.        
  113.         do {
  114.             status = asi_u64_read(ASI_INTR_DISPATCH_STATUS, 0);
  115.         } while (status & INTR_DISPATCH_STATUS_BUSY);
  116.        
  117.         done = !(status & INTR_DISPATCH_STATUS_NACK);
  118.         if (!done) {
  119.             /*
  120.              * Prevent deadlock.
  121.              */        
  122.             (void) interrupts_enable();
  123.             delay(20 + (tick_read() & 0xff));
  124.             (void) interrupts_disable();
  125.         }
  126.     } while (done);
  127.    
  128.     preemption_enable();
  129. }
  130.  
  131. /*
  132.  * Deliver IPI to all processors except the current one.
  133.  *
  134.  * The sparc64 architecture does not support any group addressing
  135.  * which is found, for instance, on ia32 and amd64. Therefore we
  136.  * need to simulate the broadcast by sending the message to
  137.  * all target processors step by step.
  138.  *
  139.  * We assume that interrupts are disabled.
  140.  *
  141.  * @param ipi IPI number.
  142.  */
  143. void ipi_broadcast_arch(int ipi)
  144. {
  145.     unsigned int i;
  146.    
  147.     void (* func)(void);
  148.    
  149.     switch (ipi) {
  150.     case IPI_TLB_SHOOTDOWN:
  151.         func = tlb_shootdown_ipi_recv;
  152.         break;
  153.     default:
  154.         panic("Unknown IPI (%d).", ipi);
  155.         break;
  156.     }
  157.    
  158.     /*
  159.      * As long as we don't support hot-plugging
  160.      * or hot-unplugging of CPUs, we can walk
  161.      * the cpus array and read processor's MID
  162.      * without locking.
  163.      */
  164.    
  165.     for (i = 0; i < config.cpu_active; i++) {
  166.         if (&cpus[i] == CPU)
  167.             continue;       /* skip the current CPU */
  168.  
  169.         cross_call(cpus[i].arch.mid, func);
  170.     }
  171. }
  172.  
  173. /** @}
  174.  */
  175.