1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 
  27 #include <sys/cpuvar.h>
  28 #include <sys/stack.h>
  29 #include <vm/seg_kp.h>
  30 #include <sys/proc.h>
  31 #include <sys/pset.h>
  32 #include <sys/sysmacros.h>
  33 
  34 /*
  35  * Create and initialize an interrupt thread.
  36  */
  37 static void
  38 thread_create_intr(cpu_t *cp)
  39 {
  40         kthread_t *tp;
  41 
  42         tp = thread_create(NULL, 0,
  43             (void (*)())thread_create_intr, NULL, 0, &p0, TS_ONPROC, 0);
  44 
  45         /*
  46          * Set the thread in the TS_FREE state.  The state will change
  47          * to TS_ONPROC only while the interrupt is active.  Think of these
  48          * as being on a private free list for the CPU.  Being TS_FREE keeps
  49          * inactive interrupt threads out of debugger thread lists.
  50          *
  51          * We cannot call thread_create with TS_FREE because of the current
  52          * checks there for ONPROC.  Fix this when thread_create takes flags.
  53          */
  54         THREAD_FREEINTR(tp, cp);
  55 
  56         /*
  57          * Nobody should ever reference the credentials of an interrupt
  58          * thread so make it NULL to catch any such references.
  59          */
  60         tp->t_cred = NULL;
  61         tp->t_flag |= T_INTR_THREAD;
  62         tp->t_cpu = cp;
  63         tp->t_bound_cpu = cp;
  64         tp->t_disp_queue = cp->cpu_disp;
  65         tp->t_affinitycnt = 1;
  66         tp->t_preempt = 1;
  67 
  68         /*
  69          * Don't make a user-requested binding on this thread so that
  70          * the processor can be offlined.
  71          */
  72         tp->t_bind_cpu = PBIND_NONE; /* no USER-requested binding */
  73         tp->t_bind_pset = PS_NONE;
  74 
  75 #if defined(__i386) || defined(__amd64)
  76         tp->t_stk -= STACK_ALIGN;
  77         *(tp->t_stk) = 0;            /* terminate intr thread stack */
  78 #endif
  79 
  80         /*
  81          * Link onto CPU's interrupt pool.
  82          */
  83         tp->t_link = cp->cpu_intr_thread;
  84         cp->cpu_intr_thread = tp;
  85 }
  86 
  87 /*
  88  * Allocate a given number of interrupt threads for a given CPU.
  89  * These threads will get freed by cpu_destroy_bound_threads()
  90  * when CPU gets unconfigured.
  91  */
  92 void
  93 cpu_intr_alloc(cpu_t *cp, int n)
  94 {
  95         int i;
  96 
  97         for (i = 0; i < n; i++)
  98                 thread_create_intr(cp);
  99 
 100         cp->cpu_intr_stack = (caddr_t)segkp_get(segkp, INTR_STACK_SIZE,
 101             KPD_HASREDZONE | KPD_NO_ANON | KPD_LOCKED) +
 102             INTR_STACK_SIZE - SA(MINFRAME);
 103 }