1 /* $NetBSD: pic_splfuncs.c,v 1.5 2014/04/16 22:44:42 matt Exp $ */ 2 /*- 3 * Copyright (c) 2008 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Matt Thomas. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: pic_splfuncs.c,v 1.5 2014/04/16 22:44:42 matt Exp $"); 32 33 #define _INTR_PRIVATE 34 #include <sys/param.h> 35 #include <sys/atomic.h> 36 #include <sys/evcnt.h> 37 #include <sys/kernel.h> 38 39 #include <dev/cons.h> 40 41 #include <arm/armreg.h> 42 #include <arm/cpu.h> 43 #include <arm/cpufunc.h> 44 45 #include <arm/pic/picvar.h> 46 47 48 int 49 _splraise(int newipl) 50 { 51 struct cpu_info * const ci = curcpu(); 52 const int oldipl = ci->ci_cpl; 53 KASSERT(newipl < NIPL); 54 if (newipl > ci->ci_cpl) { 55 pic_set_priority(ci, newipl); 56 } 57 return oldipl; 58 } 59 int 60 _spllower(int newipl) 61 { 62 struct cpu_info * const ci = curcpu(); 63 const int oldipl = ci->ci_cpl; 64 KASSERT(panicstr || newipl <= ci->ci_cpl); 65 if (newipl < ci->ci_cpl) { 66 register_t psw = cpsid(I32_bit); 67 ci->ci_intr_depth++; 68 pic_do_pending_ints(psw, newipl, NULL); 69 ci->ci_intr_depth--; 70 if ((psw & I32_bit) == 0) 71 cpsie(I32_bit); 72 cpu_dosoftints(); 73 } 74 return oldipl; 75 } 76 77 void 78 splx(int savedipl) 79 { 80 struct cpu_info * const ci = curcpu(); 81 KASSERT(savedipl < NIPL); 82 83 if (__predict_false(savedipl == ci->ci_cpl)) { 84 return; 85 } 86 87 register_t psw = cpsid(I32_bit); 88 KASSERTMSG(panicstr != NULL || savedipl < ci->ci_cpl, 89 "splx(%d) to a higher ipl than %d", savedipl, ci->ci_cpl); 90 91 ci->ci_intr_depth++; 92 pic_do_pending_ints(psw, savedipl, NULL); 93 ci->ci_intr_depth--; 94 KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d", 95 ci->ci_cpl, savedipl); 96 if ((psw & I32_bit) == 0) 97 cpsie(I32_bit); 98 cpu_dosoftints(); 99 KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d", 100 ci->ci_cpl, savedipl); 101 } 102