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      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 /*
     28  * FILE NOTICE BEGIN
     29  *
     30  * This file should not be modified.  If you wish to modify it or have it
     31  * modified, please contact Sun Microsystems at <LFI149367 (at) -sun-.-com->
     32  * (without anti-spam dashes)
     33  *
     34  * FILE NOTICE END
     35  */
     36 
     37 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     38 
     39 #include <sys/cpuvar.h>
     40 #include <sys/stack.h>
     41 #include <vm/seg_kp.h>
     42 #include <sys/proc.h>
     43 #include <sys/pset.h>
     44 #include <sys/sysmacros.h>
     45 
     46 /*
     47  * Create and initialize an interrupt thread.
     48  */
     49 static void
     50 thread_create_intr(cpu_t *cp)
     51 {
     52 	kthread_t *tp;
     53 
     54 	tp = thread_create(NULL, 0,
     55 	    (void (*)())thread_create_intr, NULL, 0, &p0, TS_ONPROC, 0);
     56 
     57 	/*
     58 	 * Set the thread in the TS_FREE state.  The state will change
     59 	 * to TS_ONPROC only while the interrupt is active.  Think of these
     60 	 * as being on a private free list for the CPU.  Being TS_FREE keeps
     61 	 * inactive interrupt threads out of debugger thread lists.
     62 	 *
     63 	 * We cannot call thread_create with TS_FREE because of the current
     64 	 * checks there for ONPROC.  Fix this when thread_create takes flags.
     65 	 */
     66 	THREAD_FREEINTR(tp, cp);
     67 
     68 	/*
     69 	 * Nobody should ever reference the credentials of an interrupt
     70 	 * thread so make it NULL to catch any such references.
     71 	 */
     72 	tp->t_cred = NULL;
     73 	tp->t_flag |= T_INTR_THREAD;
     74 	tp->t_cpu = cp;
     75 	tp->t_bound_cpu = cp;
     76 	tp->t_disp_queue = cp->cpu_disp;
     77 	tp->t_affinitycnt = 1;
     78 	tp->t_preempt = 1;
     79 
     80 	/*
     81 	 * Don't make a user-requested binding on this thread so that
     82 	 * the processor can be offlined.
     83 	 */
     84 	tp->t_bind_cpu = PBIND_NONE;	/* no USER-requested binding */
     85 	tp->t_bind_pset = PS_NONE;
     86 
     87 #if defined(__i386) || defined(__amd64)
     88 	tp->t_stk -= STACK_ALIGN;
     89 	*(tp->t_stk) = 0;		/* terminate intr thread stack */
     90 #endif
     91 
     92 	/*
     93 	 * Link onto CPU's interrupt pool.
     94 	 */
     95 	tp->t_link = cp->cpu_intr_thread;
     96 	cp->cpu_intr_thread = tp;
     97 }
     98 
     99 /*
    100  * Allocate a given number of interrupt threads for a given CPU.
    101  * These threads will get freed by cpu_destroy_bound_threads()
    102  * when CPU gets unconfigured.
    103  */
    104 void
    105 cpu_intr_alloc(cpu_t *cp, int n)
    106 {
    107 	int i;
    108 
    109 	for (i = 0; i < n; i++)
    110 		thread_create_intr(cp);
    111 
    112 	cp->cpu_intr_stack = (caddr_t)segkp_get(segkp, INTR_STACK_SIZE,
    113 		KPD_HASREDZONE | KPD_NO_ANON | KPD_LOCKED) +
    114 		INTR_STACK_SIZE - SA(MINFRAME);
    115 }
    116