1 /* $NetBSD: pic_splfuncs.c,v 1.7 2015/04/02 03:11:34 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 1.7 2015/04/02 03:11:34 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/lwp.h> 38 #include <sys/kernel.h> 39 40 #include <dev/cons.h> 41 42 #if defined(__arm__) 43 #include <arm/armreg.h> 44 #include <arm/cpu.h> 45 #include <arm/cpufunc.h> 46 #elif defined(__aarch64__) 47 #include <aarch64/locore.h> 48 #define I32_bit DAIF_I 49 #define F32_bit DAIF_F 50 #endif 51 52 #include <arm/pic/picvar.h> 53 54 55 int 56 _splraise(int newipl) 57 { 58 struct cpu_info * const ci = curcpu(); 59 const int oldipl = ci->ci_cpl; 60 KASSERT(newipl < NIPL); 61 if (newipl > ci->ci_cpl) { 62 pic_set_priority(ci, newipl); 63 } 64 return oldipl; 65 } 66 int 67 _spllower(int newipl) 68 { 69 struct cpu_info * const ci = curcpu(); 70 const int oldipl = ci->ci_cpl; 71 KASSERT(panicstr || newipl <= ci->ci_cpl); 72 if (newipl < ci->ci_cpl) { 73 register_t psw = cpsid(I32_bit); 74 ci->ci_intr_depth++; 75 pic_do_pending_ints(psw, newipl, NULL); 76 ci->ci_intr_depth--; 77 if ((psw & I32_bit) == 0 || newipl == IPL_NONE) 78 cpsie(I32_bit); 79 cpu_dosoftints(); 80 } 81 return oldipl; 82 } 83 84 void 85 splx(int savedipl) 86 { 87 struct cpu_info * const ci = curcpu(); 88 KASSERT(savedipl < NIPL); 89 90 if (__predict_false(savedipl == ci->ci_cpl)) { 91 return; 92 } 93 94 register_t psw = cpsid(I32_bit); 95 KASSERTMSG(panicstr != NULL || savedipl < ci->ci_cpl, 96 "splx(%d) to a higher ipl than %d", savedipl, ci->ci_cpl); 97 98 ci->ci_intr_depth++; 99 pic_do_pending_ints(psw, savedipl, NULL); 100 ci->ci_intr_depth--; 101 KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d", 102 ci->ci_cpl, savedipl); 103 if ((psw & I32_bit) == 0) 104 cpsie(I32_bit); 105 cpu_dosoftints(); 106 KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d", 107 ci->ci_cpl, savedipl); 108 } 109