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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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5 -- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNARL is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNARL was developed by the GNARL team at Florida State University. --
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28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This is the VxWorks version of this package
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33
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34 -- It is simpler than other versions because the Ada interrupt handling
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35 -- mechanisms are used for hardware interrupts rather than signals.
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36
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37 package body System.Interrupt_Management is
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38
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39 use System.OS_Interface;
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40
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41 -----------------------
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42 -- Local Subprograms --
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43 -----------------------
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44
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45 function State (Int : Interrupt_ID) return Character;
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46 pragma Import (C, State, "__gnat_get_interrupt_state");
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47 -- Get interrupt state. Defined in init.c The input argument is the
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48 -- hardware interrupt number, and the result is one of the following:
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49
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50 Runtime : constant Character := 'r';
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51 Default : constant Character := 's';
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52 -- 'n' this interrupt not set by any Interrupt_State pragma
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53 -- 'u' Interrupt_State pragma set state to User
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54 -- 'r' Interrupt_State pragma set state to Runtime
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55 -- 's' Interrupt_State pragma set state to System (use "default"
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56 -- system handler)
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57
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58 ----------------
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59 -- Initialize --
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60 ----------------
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61
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62 Initialized : Boolean := False;
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63 -- Set to True once Initialize is called, further calls have no effect
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64
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65 procedure Initialize is
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66
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67 begin
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68 if Initialized then
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69 return;
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70 end if;
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71
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72 Initialized := True;
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73
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74 -- Change this if you want to use another signal for task abort.
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75 -- SIGTERM might be a good one.
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76
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77 Abort_Task_Interrupt := SIGABRT;
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78
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79 -- Initialize hardware interrupt handling
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80
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81 pragma Assert (Reserve = (Interrupt_ID'Range => False));
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82
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83 -- Check all interrupts for state that requires keeping them reserved
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84
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85 for J in Interrupt_ID'Range loop
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86 if State (J) = Default or else State (J) = Runtime then
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87 Reserve (J) := True;
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88 end if;
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89 end loop;
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90
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91 end Initialize;
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92
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93 end System.Interrupt_Management;
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