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| 961 | pj | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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| 11 | * Luca Abeni <luca@gandalf.sssup.it> |
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| 12 | * (see the web pages for full authors list) |
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| 13 | * |
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| 14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 15 | * |
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| 16 | * http://www.sssup.it |
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| 17 | * http://retis.sssup.it |
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| 18 | * http://shark.sssup.it |
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| 19 | */ |
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| 20 | |||
| 21 | |||
| 22 | /** |
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| 23 | ------------ |
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| 24 | CVS : $Id: dummy.h,v 1.1 2005-02-25 10:55:09 pj Exp $ |
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| 25 | |||
| 26 | File: $File$ |
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| 27 | Revision: $Revision: 1.1 $ |
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| 28 | Last update: $Date: 2005-02-25 10:55:09 $ |
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| 29 | ------------ |
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| 30 | |||
| 31 | This file contains the scheduling module RR (Round Robin) |
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| 32 | |||
| 33 | Title: |
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| 34 | DUMMY |
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| 35 | |||
| 36 | Task Models Accepted: |
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| 37 | DUMMY_TASK_MODEL - Dummy process (not usable) |
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| 38 | |||
| 39 | Description: |
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| 40 | This module creates the dummy task, witch is a special task that |
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| 41 | do nothing. |
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| 42 | |||
| 43 | Exceptions raised: |
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| 44 | XUNVALID_GUEST |
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| 45 | This level doesn't support guests. When a guest operation |
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| 46 | is called, the exception is raised. |
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| 47 | XUNVALID_DUMMY_OP |
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| 48 | The dummy task can't be created, or activated, and so on... |
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| 49 | |||
| 50 | Restrictions & special features: |
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| 51 | - the task model DUMMY_TASK_MODEL can be used only at init time |
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| 52 | to register the dummy process into the system. |
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| 53 | - if __HLT_WORKS__ defined in this header file, the dummy task can |
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| 54 | perform a hlt istruction to save power... |
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| 55 | |||
| 56 | **/ |
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| 57 | |||
| 58 | /* |
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| 59 | * Copyright (C) 2000 Paolo Gai |
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| 60 | * |
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| 61 | * This program is free software; you can redistribute it and/or modify |
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| 62 | * it under the terms of the GNU General Public License as published by |
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| 63 | * the Free Software Foundation; either version 2 of the License, or |
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| 64 | * (at your option) any later version. |
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| 65 | * |
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| 66 | * This program is distributed in the hope that it will be useful, |
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| 67 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 68 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 69 | * GNU General Public License for more details. |
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| 70 | * |
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| 71 | * You should have received a copy of the GNU General Public License |
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| 72 | * along with this program; if not, write to the Free Software |
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| 73 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 74 | * |
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| 75 | */ |
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| 76 | |||
| 77 | |||
| 78 | #ifndef __DUMMY_H__ |
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| 79 | #define __DUMMY_H__ |
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| 80 | |||
| 81 | #include <kernel/types.h> |
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| 1621 | fabio | 82 | #include <arch/sys/cdefs.h> |
| 961 | pj | 83 | |
| 84 | __BEGIN_DECLS |
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| 85 | |||
| 86 | /*+ |
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| 87 | On upper Intel CPUs it is possible to avoid CPU power consumption |
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| 88 | when the system is idle issuing the hlt instruction. |
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| 89 | This is often available on many 32 bit CPUs... |
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| 90 | If it is, simply define the following!!! |
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| 91 | +*/ |
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| 92 | #define __HLT_WORKS__ |
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| 93 | |||
| 94 | /*+ Registration function |
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| 95 | |||
| 96 | returns the level number at which the module has been registered. |
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| 97 | +*/ |
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| 98 | LEVEL dummy_register_level(); |
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| 99 | |||
| 100 | __END_DECLS |
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| 101 | #endif |