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 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 .file "smt_pause.s" 26 27#include <sys/asm_linkage.h> 28#include <../assym.h> 29 30/* 31 * void smt_pause(void) 32 * 33 * Do nothing efficiently. 34 */ 35 36#ifdef lint 37void 38smt_pause(void) 39{ 40} 41#else 42#define BANKS (4 * 64) 43 ENTRY(smt_pause) 44 save %sp, -SA(MINFRAME+BANKS), %sp 45 ld [%g7 + UL_LWPID], %i3 ! curthread->ul_lwpid 46 add %fp, STACK_BIAS-BANKS, %i0 47 and %i3, 0x3, %i2 ! save last 2 bits 48 sllx %i2, 0x6, %i1 ! pick a slot 49 add %i1, %i0, %o0 50 casx [%o0], %g0, %g0 51 casx [%o0], %g0, %g0 52 ret 53 restore 54 SET_SIZE(smt_pause) 55#endif 56