The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/ast.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        ast.h,v $
   29  * Revision 2.11  92/05/22  18:37:52  jfriedl
   30  *              Put calls to aston/astoff in {} for safety.
   31  * 
   32  * Revision 2.9  92/05/04  11:24:24  danner
   33  *      Changed AST_PER_THREAD definition (from dbg).
   34  *      [92/05/03            danner]
   35  * 
   36  * Revision 2.8  92/04/06  01:16:11  rpd
   37  *      Fixed ast_context bug, with AST_PER_THREAD.  From dbg.
   38  *      [92/04/05            rpd]
   39  * 
   40  * Revision 2.7  91/08/28  11:14:20  jsb
   41  *      Renamed AST_CLPORT to AST_NETIPC.
   42  *      [91/08/14  21:38:09  jsb]
   43  * 
   44  * Revision 2.6  91/06/06  17:06:48  jsb
   45  *      Added AST_CLPORT.
   46  *      [91/05/13  17:35:08  jsb]
   47  * 
   48  * Revision 2.5  91/05/14  16:39:58  mrt
   49  *      Correcting copyright
   50  * 
   51  * Revision 2.4  91/03/16  14:49:32  rpd
   52  *      Fixed dummy aston, astoff definitions.
   53  *      [91/02/12            rpd]
   54  *      Revised the AST interface, adding AST_NETWORK.
   55  *      Added volatile attribute to need_ast.
   56  *      [91/01/18            rpd]
   57  * 
   58  * Revision 2.3  91/02/05  17:25:38  mrt
   59  *      Changed to new Mach copyright
   60  *      [91/02/01  16:11:14  mrt]
   61  * 
   62  * Revision 2.2  90/06/02  14:53:34  rpd
   63  *      Merged with mainline.
   64  *      [90/03/26  22:02:55  rpd]
   65  * 
   66  * Revision 2.1  89/08/03  15:45:04  rwd
   67  * Created.
   68  * 
   69  *  6-Sep-88  David Golub (dbg) at Carnegie-Mellon University
   70  *      Adapted to MACH_KERNEL and VAX.
   71  *
   72  * 11-Aug-88  David Black (dlb) at Carnegie-Mellon University
   73  *      Created.  dbg gets equal credit for the design.
   74  *
   75  */
   76 
   77 /*
   78  *      kern/ast.h: Definitions for Asynchronous System Traps.
   79  */
   80 
   81 #ifndef _KERN_AST_H_
   82 #define _KERN_AST_H_
   83 
   84 /*
   85  *      A CPU takes an AST when it is about to return to user code.
   86  *      Instead of going back to user code, it calls ast_taken.
   87  *      Machine-dependent code is responsible for maintaining
   88  *      a set of reasons for an AST, and passing this set to ast_taken.
   89  */
   90 
   91 #include <cpus.h>
   92 
   93 #include <kern/cpu_number.h>
   94 #include <kern/macro_help.h>
   95 #include <machine/ast.h>
   96 
   97 /*
   98  *      Bits for reasons
   99  */
  100 
  101 #define AST_ZILCH       0x0
  102 #define AST_HALT        0x1
  103 #define AST_TERMINATE   0x2
  104 #define AST_BLOCK       0x4
  105 #define AST_NETWORK     0x8
  106 #define AST_NETIPC      0x10
  107 
  108 #define AST_SCHEDULING  (AST_HALT|AST_TERMINATE|AST_BLOCK)
  109 
  110 /*
  111  * Per-thread ASTs are reset at context-switch time.
  112  * machine/ast.h can define MACHINE_AST_PER_THREAD.
  113  */
  114 
  115 #ifndef MACHINE_AST_PER_THREAD
  116 #define MACHINE_AST_PER_THREAD  0
  117 #endif
  118 
  119 #define AST_PER_THREAD  (AST_HALT | AST_TERMINATE | MACHINE_AST_PER_THREAD)
  120 
  121 typedef unsigned int ast_t;
  122 
  123 extern volatile ast_t need_ast[NCPUS];
  124 
  125 #ifdef  MACHINE_AST
  126 /*
  127  *      machine/ast.h is responsible for defining aston and astoff.
  128  */
  129 #else   MACHINE_AST
  130 
  131 #define aston(mycpu)
  132 #define astoff(mycpu)
  133 
  134 #endif  MACHINE_AST
  135 
  136 extern void ast_taken();
  137 
  138 /*
  139  *      ast_needed, ast_on, ast_off, ast_context, and ast_propagate
  140  *      assume splsched.  mycpu is always cpu_number().  It is an
  141  *      argument in case cpu_number() is expensive.
  142  */
  143 
  144 #define ast_needed(mycpu)               need_ast[mycpu]
  145 
  146 #define ast_on(mycpu, reasons)                                          \
  147 MACRO_BEGIN                                                             \
  148         if ((need_ast[mycpu] |= (reasons)) != AST_ZILCH)                \
  149                 { aston(mycpu); }                                       \
  150 MACRO_END
  151 
  152 #define ast_off(mycpu, reasons)                                         \
  153 MACRO_BEGIN                                                             \
  154         if ((need_ast[mycpu] &= ~(reasons)) == AST_ZILCH)               \
  155                 { astoff(mycpu); }                                      \
  156 MACRO_END
  157 
  158 #define ast_propagate(thread, mycpu)    ast_on((mycpu), (thread)->ast)
  159 
  160 #define ast_context(thread, mycpu)                                      \
  161 MACRO_BEGIN                                                             \
  162         if ((need_ast[mycpu] =                                          \
  163              (need_ast[mycpu] &~ AST_PER_THREAD) | (thread)->ast)       \
  164                                         != AST_ZILCH)                   \
  165                 { aston(mycpu); }                                       \
  166         else                                                            \
  167                 { astoff(mycpu); }                                      \
  168 MACRO_END
  169 
  170 
  171 #define thread_ast_set(thread, reason)          (thread)->ast |= (reason)
  172 #define thread_ast_clear(thread, reason)        (thread)->ast &= ~(reason)
  173 #define thread_ast_clear_all(thread)            (thread)->ast = AST_ZILCH
  174 
  175 /*
  176  *      NOTE: if thread is the current thread, thread_ast_set should
  177  *      be followed by ast_propagate().
  178  */
  179 
  180 #endif  _KERN_AST_H_

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