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 (c) 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 .file "smt_pause.s" 27 28/* 29 * void smt_pause(void) 30 * 31 * Do nothing efficiently. 32 * 33 */ 34 35#include <sys/asm_linkage.h> 36#include <sys/niagaraasi.h> 37#include <sys/asi.h> 38#include <sys/stack.h> 39 40#if defined(NIAGARA_IMPL) 41#include <assym.h> 42#endif 43 44 ENTRY(smt_pause) 45#if defined(NIAGARA2_IMPL) || defined(VFALLS_IMPL) || defined(KT_IMPL) 46 rd %ccr, %g0 47 rd %ccr, %g0 48 retl 49 rd %ccr, %g0 50#else /* NIAGARA2_IMPL */ 51#define BANKS (4 * 64) /* 4 cachelines, cover all banks */ 52 save %sp, -SA(MINFRAME+BANKS), %sp 53 54 ld [%g7 + UL_LWPID], %i3 ! curthread->ul_lwpid 55 add %fp, STACK_BIAS-BANKS, %i0 56 and %i3, 0x3, %i2 ! save last 2 bits 57 sllx %i2, 0x6, %i1 ! pick a slot 58 add %i1, %i0, %o0 59 60 casx [%o0], %g0, %g0 61 casx [%o0], %g0, %g0 62 casx [%o0], %g0, %g0 63 ret 64 restore 65#endif /* NIAGARA2_IMPL */ 66 SET_SIZE(smt_pause) 67 68