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@-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 */
49static void
50thread_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 */
104void
105cpu_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