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(__x86) 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 } 104