1 /* $NetBSD: pic_splfuncs.c,v 1.22 2021/09/20 21:05:15 jmcneill 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 31 #include "opt_modular.h" 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: pic_splfuncs.c,v 1.22 2021/09/20 21:05:15 jmcneill Exp $"); 35 36 #define _INTR_PRIVATE 37 #include <sys/param.h> 38 #include <sys/atomic.h> 39 #include <sys/evcnt.h> 40 #include <sys/lwp.h> 41 #include <sys/kernel.h> 42 43 #include <dev/cons.h> 44 45 #include <arm/armreg.h> 46 #include <arm/cpu.h> 47 #include <arm/cpufunc.h> 48 #include <arm/locore.h> /* for compat aarch64 */ 49 50 #include <arm/pic/picvar.h> 51 52 static int pic_default_splraise(int); 53 static int pic_default_spllower(int); 54 static void pic_default_splx(int); 55 56 int (*pic_splraise)(int) = pic_default_splraise; 57 int (*pic_spllower)(int) = pic_default_spllower; 58 void (*pic_splx)(int) = pic_default_splx; 59 60 static int 61 pic_default_splraise(int newipl) 62 { 63 struct cpu_info * const ci = curcpu(); 64 const int oldipl = ci->ci_cpl; 65 KASSERT(newipl < NIPL); 66 if (newipl > ci->ci_cpl) { 67 pic_set_priority(ci, newipl); 68 } 69 return oldipl; 70 } 71 72 static int 73 pic_default_spllower(int newipl) 74 { 75 struct cpu_info * const ci = curcpu(); 76 const int oldipl = ci->ci_cpl; 77 KASSERT(panicstr || newipl <= ci->ci_cpl); 78 if (newipl < ci->ci_cpl) { 79 register_t psw = DISABLE_INTERRUPT_SAVE(); 80 ci->ci_intr_depth++; 81 pic_do_pending_ints(psw, newipl, NULL); 82 ci->ci_intr_depth--; 83 if ((psw & I32_bit) == 0 || newipl == IPL_NONE) 84 ENABLE_INTERRUPT(); 85 cpu_dosoftints(); 86 } 87 return oldipl; 88 } 89 90 static void 91 pic_default_splx(int savedipl) 92 { 93 struct cpu_info * const ci = curcpu(); 94 KASSERT(savedipl < NIPL); 95 96 if (__predict_false(savedipl == ci->ci_cpl)) { 97 return; 98 } 99 100 register_t psw = DISABLE_INTERRUPT_SAVE(); 101 KASSERTMSG(panicstr != NULL || savedipl < ci->ci_cpl, 102 "splx(%d) to a higher ipl than %d", savedipl, ci->ci_cpl); 103 104 ci->ci_intr_depth++; 105 pic_do_pending_ints(psw, savedipl, NULL); 106 ci->ci_intr_depth--; 107 KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d", 108 ci->ci_cpl, savedipl); 109 if ((psw & I32_bit) == 0) 110 ENABLE_INTERRUPT(); 111 cpu_dosoftints(); 112 KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d", 113 ci->ci_cpl, savedipl); 114 } 115 116 #ifdef MODULAR 117 #ifdef _spllower 118 #undef _spllower 119 #endif 120 int _spllower(int); 121 122 #ifdef _splraise 123 #undef _splraise 124 #endif 125 int _splraise(int); 126 127 #ifdef splx 128 #undef splx 129 #endif 130 void splx(int); 131 132 int 133 _spllower(int newipl) 134 { 135 return pic_spllower(newipl); 136 } 137 138 int 139 _splraise(int newipl) 140 { 141 return pic_splraise(newipl); 142 } 143 144 void 145 splx(int savedipl) 146 { 147 pic_splx(savedipl); 148 } 149 #endif /* !MODULAR */ 150