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Annotation of XNU/osfmk/kern/ast.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            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: 
        !            53: /*
        !            54:  *      kern/ast.h: Definitions for Asynchronous System Traps.
        !            55:  */
        !            56: 
        !            57: #ifndef _KERN_AST_H_
        !            58: #define _KERN_AST_H_
        !            59: 
        !            60: #include <cpus.h>
        !            61: #include <platforms.h>
        !            62: 
        !            63: #include <kern/assert.h>
        !            64: #include <kern/cpu_number.h>
        !            65: #include <kern/macro_help.h>
        !            66: #include <kern/lock.h>
        !            67: #include <kern/spl.h>
        !            68: #include <machine/ast.h>
        !            69: 
        !            70: /*
        !            71:  *      A CPU takes an AST when it is about to return to user code.
        !            72:  *      Instead of going back to user code, it calls ast_taken.
        !            73:  *      Machine-dependent code is responsible for maintaining
        !            74:  *      a set of reasons for an AST, and passing this set to ast_taken.
        !            75:  */
        !            76: 
        !            77: typedef unsigned int ast_t;
        !            78: 
        !            79: /*
        !            80:  *      Bits for reasons
        !            81:  */
        !            82: #define AST_NONE       0x00
        !            83: #define AST_HALT       0x01
        !            84: #define AST_TERMINATE  0x02
        !            85: #define AST_BLOCK       0x04
        !            86: #define AST_UNUSED      0x08
        !            87: #define AST_QUANTUM     0x10
        !            88: #define AST_APC                0x20    /* migration APC hook */
        !            89: #define        AST_URGENT      0x40
        !            90: 
        !            91: /*
        !            92:  * JMM - This is here temporarily. AST_BSD is used to simulate a
        !            93:  * general purpose mechanism for setting asynchronous procedure calls
        !            94:  * from the outside.
        !            95:  */
        !            96: #define        AST_BSD         0x80
        !            97: #define        AST_BSD_INIT    0x100
        !            98: 
        !            99: #include <dipc.h>
        !           100: #if    DIPC
        !           101: #define        AST_DIPC        0x10000
        !           102: #endif /* DIPC */
        !           103: 
        !           104: #define AST_SWAPOUT    0x20000
        !           105: 
        !           106: #define        AST_ALL         (~AST_NONE)
        !           107: 
        !           108: #define AST_SCHEDULING  (AST_HALT | AST_TERMINATE | AST_BLOCK | AST_SWAPOUT)
        !           109: #define        AST_PREEMPT     (AST_BLOCK | AST_QUANTUM | AST_URGENT)
        !           110: 
        !           111: extern volatile ast_t need_ast[NCPUS];
        !           112: 
        !           113: #ifdef  MACHINE_AST
        !           114: /*
        !           115:  *      machine/ast.h is responsible for defining aston and astoff.
        !           116:  */
        !           117: #else   /* MACHINE_AST */
        !           118: 
        !           119: #define aston(mycpu)
        !           120: #define astoff(mycpu)
        !           121: 
        !           122: #endif  /* MACHINE_AST */
        !           123: 
        !           124: /* Initialize module */
        !           125: extern void    ast_init(void);
        !           126: 
        !           127: /* Handle ASTs */
        !           128: extern void    ast_taken(
        !           129:                        boolean_t       preemption,
        !           130:                        ast_t           mask,
        !           131:                        boolean_t       interrupt);
        !           132: 
        !           133: /* Check for pending ASTs */
        !           134: extern void            ast_check(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 (MACHINE_AST_PER_THREAD|AST_HALT|AST_TERMINATE|AST_APC)
        !           144: 
        !           145: /*
        !           146:  *      ast_needed, ast_on, ast_off, ast_context, and ast_propagate
        !           147:  *      assume splsched.
        !           148:  */
        !           149: 
        !           150: #define ast_needed(mycpu)               need_ast[mycpu]
        !           151: 
        !           152: #define ast_on_fast(reasons)                                           \
        !           153: MACRO_BEGIN                                                            \
        !           154:        int mycpu = cpu_number();                                       \
        !           155:        if ((need_ast[mycpu] |= (reasons)) != AST_NONE)                 \
        !           156:                { aston(mycpu); }                                       \
        !           157: MACRO_END
        !           158: 
        !           159: #define ast_off_fast(reasons)                                          \
        !           160: MACRO_BEGIN                                                            \
        !           161:        int mycpu = cpu_number();                                       \
        !           162:        if ((need_ast[mycpu] &= ~(reasons)) == AST_NONE)                \
        !           163:                 { astoff(mycpu); }                                     \
        !           164: MACRO_END
        !           165: 
        !           166: #define ast_propagate(reasons)         ast_on(reasons)
        !           167: 
        !           168: #define ast_context(act, mycpu)                                                \
        !           169: MACRO_BEGIN                                                            \
        !           170:        assert(mycpu == cpu_number());                                  \
        !           171:        if ((need_ast[mycpu] =                                          \
        !           172:             (need_ast[mycpu] &~ AST_PER_THREAD) | (act)->ast)          \
        !           173:                                        != AST_NONE)                    \
        !           174:                { aston(mycpu); }                                       \
        !           175:        else                                                            \
        !           176:                { astoff(mycpu); }                                      \
        !           177: MACRO_END
        !           178: 
        !           179: #define ast_on(reason)                      ast_on_fast(reason)
        !           180: #define ast_off(reason)                             ast_off_fast(reason)
        !           181: 
        !           182: #define thread_ast_set(act, reason)          (act)->ast |= (reason)
        !           183: #define thread_ast_clear(act, reason)        (act)->ast &= ~(reason)
        !           184: #define thread_ast_clear_all(act)            (act)->ast = AST_NONE
        !           185: 
        !           186: /*
        !           187:  *      NOTE: if thread is the current thread, thread_ast_set should
        !           188:  *      be followed by ast_propagate().
        !           189:  */
        !           190: 
        !           191: #endif  /* _KERN_AST_H_ */

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