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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /*
26: * Mach Operating System
27: * Copyright (c) 1991,1990,1989 Carnegie Mellon University
28: * All Rights Reserved.
29: *
30: * Permission to use, copy, modify and distribute this software and its
31: * documentation is hereby granted, provided that both the copyright
32: * notice and this permission notice appear in all copies of the
33: * software, derivative works or modified versions, and any portions
34: * thereof, and that both notices appear in supporting documentation.
35: *
36: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
37: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
38: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
39: *
40: * Carnegie Mellon requests users of this software to return to
41: *
42: * Software Distribution Coordinator or [email protected]
43: * School of Computer Science
44: * Carnegie Mellon University
45: * Pittsburgh PA 15213-3890
46: *
47: * any improvements or extensions that they make and grant Carnegie Mellon
48: * the rights to redistribute these changes.
49: */
50:
51: /*
52: * kern/ast.h: Definitions for Asynchronous System Traps.
53: */
54:
55: #ifndef _KERN_AST_H_
56: #define _KERN_AST_H_
57:
58: /*
59: * A CPU takes an AST when it is about to return to user code.
60: * Instead of going back to user code, it calls ast_taken.
61: * Machine-dependent code is responsible for maintaining
62: * a set of reasons for an AST, and passing this set to ast_taken.
63: */
64:
65: #import <mach/features.h>
66:
67: #include <kern/cpu_number.h>
68: #include <kern/macro_help.h>
69: #include <machine/ast.h>
70:
71: /*
72: * Bits for reasons
73: */
74:
75: #define AST_ZILCH 0x0
76: #define AST_HALT 0x1
77: #define AST_TERMINATE 0x2
78: #define AST_BLOCK 0x4
79: #define AST_NETWORK 0x8
80: #define AST_NETIPC 0x10
81: #define AST_UNIX 0x20
82:
83: #define AST_SCHEDULING (AST_HALT|AST_TERMINATE|AST_BLOCK)
84:
85: /*
86: * Per-thread ASTs are reset at context-switch time.
87: * machine/ast.h can define MACHINE_AST_PER_THREAD.
88: */
89:
90: #ifndef MACHINE_AST_PER_THREAD
91: #define MACHINE_AST_PER_THREAD 0
92: #endif
93:
94: #define AST_PER_THREAD (AST_HALT | \
95: AST_TERMINATE | \
96: MACHINE_AST_PER_THREAD)
97:
98: #ifndef __ASSEMBLER__
99:
100: typedef unsigned int ast_t;
101:
102: extern volatile ast_t need_ast[NCPUS];
103:
104: #ifdef MACHINE_AST
105: /*
106: * machine/ast.h is responsible for defining aston and astoff.
107: */
108: #else /* MACHINE_AST */
109:
110: #define aston(mycpu)
111: #define astoff(mycpu)
112:
113: #endif /* MACHINE_AST */
114:
115: extern void ast_taken();
116:
117: /*
118: * ast_needed, ast_on, ast_off, ast_context, and ast_propagate
119: * assume splsched. mycpu is always cpu_number(). It is an
120: * argument in case cpu_number() is expensive.
121: */
122:
123: #define ast_needed(mycpu) need_ast[mycpu]
124:
125: #define ast_on(mycpu, reasons) \
126: MACRO_BEGIN \
127: if ((need_ast[mycpu] |= (reasons)) != AST_ZILCH) \
128: { aston(mycpu); } \
129: MACRO_END
130:
131: #define ast_off(mycpu, reasons) \
132: MACRO_BEGIN \
133: if ((need_ast[mycpu] &= ~(reasons)) == AST_ZILCH) \
134: { astoff(mycpu); } \
135: MACRO_END
136:
137: #define ast_propagate(thread, mycpu) ast_on((mycpu), (thread)->ast)
138:
139: #define ast_context(thread, mycpu) \
140: MACRO_BEGIN \
141: if ((need_ast[mycpu] = \
142: (need_ast[mycpu] &~ AST_PER_THREAD) | (thread)->ast) \
143: != AST_ZILCH) \
144: { aston(mycpu); } \
145: else \
146: { astoff(mycpu); } \
147: MACRO_END
148:
149:
150: #define thread_ast_set(thread, reason) (thread)->ast |= (reason)
151: #define thread_ast_clear(thread, reason) (thread)->ast &= ~(reason)
152: #define thread_ast_clear_all(thread) (thread)->ast = AST_ZILCH
153:
154: /*
155: * NOTE: if thread is the current thread, thread_ast_set should
156: * be followed by ast_propagate().
157: */
158:
159: #endif /* __ASSEMBLER__ */
160: #endif /* _KERN_AST_H_ */
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