| | 1 | /* |
| | 2 | * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * This file contains Original Code and/or Modifications of Original Code |
| | 7 | * as defined in and that are subject to the Apple Public Source License |
| | 8 | * Version 2.0 (the 'License'). You may not use this file except in |
| | 9 | * compliance with the License. The rights granted to you under the License |
| | 10 | * may not be used to create, or enable the creation or redistribution of, |
| | 11 | * unlawful or unlicensed copies of an Apple operating system, or to |
| | 12 | * circumvent, violate, or enable the circumvention or violation of, any |
| | 13 | * terms of an Apple operating system software license agreement. |
| | 14 | * |
| | 15 | * Please obtain a copy of the License at |
| | 16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
| | 17 | * |
| | 18 | * The Original Code and all software distributed under the License are |
| | 19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 23 | * Please see the License for the specific language governing rights and |
| | 24 | * limitations under the License. |
| | 25 | * |
| | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
| | 27 | */ |
| | 28 | /* |
| | 29 | * @OSF_COPYRIGHT@ |
| | 30 | */ |
| | 31 | /* |
| | 32 | * Mach Operating System |
| | 33 | * Copyright (c) 1991,1990,1989 Carnegie Mellon University |
| | 34 | * All Rights Reserved. |
| | 35 | * |
| | 36 | * Permission to use, copy, modify and distribute this software and its |
| | 37 | * documentation is hereby granted, provided that both the copyright |
| | 38 | * notice and this permission notice appear in all copies of the |
| | 39 | * software, derivative works or modified versions, and any portions |
| | 40 | * thereof, and that both notices appear in supporting documentation. |
| | 41 | * |
| | 42 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| | 43 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| | 44 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| | 45 | * |
| | 46 | * Carnegie Mellon requests users of this software to return to |
| | 47 | * |
| | 48 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| | 49 | * School of Computer Science |
| | 50 | * Carnegie Mellon University |
| | 51 | * Pittsburgh PA 15213-3890 |
| | 52 | * |
| | 53 | * any improvements or extensions that they make and grant Carnegie Mellon |
| | 54 | * the rights to redistribute these changes. |
| | 55 | */ |
| | 56 | /* |
| | 57 | */ |
| | 58 | |
| | 59 | /* |
| | 60 | * kern/ast.h: Definitions for Asynchronous System Traps. |
| | 61 | */ |
| | 62 | |
| | 63 | #ifndef _KERN_AST_H_ |
| | 64 | #define _KERN_AST_H_ |
| | 65 | |
| | 66 | #include <platforms.h> |
| | 67 | |
| | 68 | #include <kern/assert.h> |
| | 69 | #include <kern/macro_help.h> |
| | 70 | #include <kern/lock.h> |
| | 71 | #include <kern/spl.h> |
| | 72 | #include <machine/ast.h> |
| | 73 | |
| | 74 | /* |
| | 75 | * A processor takes an AST when it is about to return from an |
| | 76 | * interrupt context, and calls ast_taken. |
| | 77 | * |
| | 78 | * Machine-dependent code is responsible for maintaining |
| | 79 | * a set of reasons for an AST, and passing this set to ast_taken. |
| | 80 | */ |
| | 81 | typedef uint32_t ast_t; |
| | 82 | |
| | 83 | /* |
| | 84 | * Bits for reasons |
| | 85 | */ |
| | 86 | #define AST_PREEMPT 0x01 |
| | 87 | #define AST_QUANTUM 0x02 |
| | 88 | #define AST_URGENT 0x04 |
| | 89 | #define AST_HANDOFF 0x08 |
| | 90 | #define AST_YIELD 0x10 |
| | 91 | #define AST_APC 0x20 /* migration APC hook */ |
| | 92 | /* |
| | 93 | * JMM - This is here temporarily. AST_BSD is used to simulate a |
| | 94 | * general purpose mechanism for setting asynchronous procedure calls |
| | 95 | * from the outside. |
| | 96 | */ |
| | 97 | #define AST_BSD 0x80 |
| | 98 | |
| | 99 | #define AST_NONE 0x00 |
| | 100 | #define AST_ALL (~AST_NONE) |
| | 101 | |
| | 102 | #define AST_SCHEDULING (AST_PREEMPTION | AST_YIELD | AST_HANDOFF) |
| | 103 | #define AST_PREEMPTION (AST_PREEMPT | AST_QUANTUM | AST_URGENT) |
| | 104 | |
| | 105 | #ifdef MACHINE_AST |
| | 106 | /* |
| | 107 | * machine/ast.h is responsible for defining aston and astoff. |
| | 108 | */ |
| | 109 | #else /* MACHINE_AST */ |
| | 110 | |
| | 111 | #define aston(mycpu) |
| | 112 | #define astoff(mycpu) |
| | 113 | |
| | 114 | #endif /* MACHINE_AST */ |
| | 115 | |
| | 116 | #define AST_CHUD_URGENT 0x800 |
| | 117 | #define AST_CHUD 0x400 |
| | 118 | |
| | 119 | #define AST_CHUD_ALL (AST_CHUD_URGENT|AST_CHUD) |
| | 120 | |
| | 121 | /* Initialize module */ |
| | 122 | extern void ast_init(void); |
| | 123 | |
| | 124 | /* Handle ASTs */ |
| | 125 | extern void ast_taken( |
| | 126 | ast_t mask, |
| | 127 | boolean_t enable); |
| | 128 | |
| | 129 | /* Check for pending ASTs */ |
| | 130 | extern void ast_check( |
| | 131 | processor_t processor); |
| | 132 | |
| | 133 | /* Pending ast mask for the current processor */ |
| | 134 | extern ast_t *ast_pending(void); |
| | 135 | |
| | 136 | /* |
| | 137 | * Per-thread ASTs are reset at context-switch time. |
| | 138 | */ |
| | 139 | #ifndef MACHINE_AST_PER_THREAD |
| | 140 | #define MACHINE_AST_PER_THREAD 0 |
| | 141 | #endif |
| | 142 | |
| | 143 | #define AST_PER_THREAD (AST_APC | AST_BSD | MACHINE_AST_PER_THREAD) |
| | 144 | /* |
| | 145 | * ast_pending(), ast_on(), ast_off(), ast_context(), and ast_propagate() |
| | 146 | * assume splsched. |
| | 147 | */ |
| | 148 | |
| | 149 | #define ast_on_fast(reasons) \ |
| | 150 | MACRO_BEGIN \ |
| | 151 | ast_t *myast = ast_pending(); \ |
| | 152 | \ |
| | 153 | if ((*myast |= (reasons)) != AST_NONE) \ |
| | 154 | { aston(myast); } \ |
| | 155 | MACRO_END |
| | 156 | |
| | 157 | #define ast_off_fast(reasons) \ |
| | 158 | MACRO_BEGIN \ |
| | 159 | ast_t *myast = ast_pending(); \ |
| | 160 | \ |
| | 161 | if ((*myast &= ~(reasons)) == AST_NONE) \ |
| | 162 | { astoff(myast); } \ |
| | 163 | MACRO_END |
| | 164 | |
| | 165 | #define ast_propagate(reasons) ast_on(reasons) |
| | 166 | |
| | 167 | #define ast_context(act) \ |
| | 168 | MACRO_BEGIN \ |
| | 169 | ast_t *myast = ast_pending(); \ |
| | 170 | \ |
| | 171 | if ((*myast = ((*myast &~ AST_PER_THREAD) | (act)->ast)) != AST_NONE) \ |
| | 172 | { aston(myast); } \ |
| | 173 | else \ |
| | 174 | { astoff(myast); } \ |
| | 175 | MACRO_END |
| | 176 | |
| | 177 | #define ast_on(reason) ast_on_fast(reason) |
| | 178 | #define ast_off(reason) ast_off_fast(reason) |
| | 179 | |
| | 180 | /* |
| | 181 | * NOTE: if thread is the current thread, thread_ast_set() should |
| | 182 | * be followed by ast_propagate(). |
| | 183 | */ |
| | 184 | #define thread_ast_set(act, reason) \ |
| | 185 | (hw_atomic_or(&(act)->ast, (reason))) |
| | 186 | #define thread_ast_clear(act, reason) \ |
| | 187 | (hw_atomic_and(&(act)->ast, ~(reason))) |
| | 188 | #define thread_ast_clear_all(act) \ |
| | 189 | (hw_atomic_and(&(act)->ast, AST_NONE)) |
| | 190 | |
| | 191 | #ifdef MACH_BSD |
| | 192 | |
| | 193 | extern void astbsd_on(void); |
| | 194 | extern void act_set_astbsd(thread_t); |
| | 195 | extern void bsd_ast(thread_t); |
| | 196 | |
| | 197 | #endif /* MACH_BSD */ |
| | 198 | |
| | 199 | #endif /* _KERN_AST_H_ */ |
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