1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup RTEMSScorePerCPU |
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7 | * |
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8 | * @brief This source file contains the implementation of |
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9 | * _Per_CPU_State_wait_for_non_initial_state(). |
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10 | */ |
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11 | |
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12 | /* |
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13 | * Copyright (c) 2014 embedded brains GmbH & Co. KG |
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14 | * |
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15 | * Redistribution and use in source and binary forms, with or without |
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16 | * modification, are permitted provided that the following conditions |
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17 | * are met: |
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18 | * 1. Redistributions of source code must retain the above copyright |
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19 | * notice, this list of conditions and the following disclaimer. |
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20 | * 2. Redistributions in binary form must reproduce the above copyright |
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21 | * notice, this list of conditions and the following disclaimer in the |
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22 | * documentation and/or other materials provided with the distribution. |
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23 | * |
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24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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34 | * POSSIBILITY OF SUCH DAMAGE. |
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35 | */ |
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36 | |
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37 | #ifdef HAVE_CONFIG_H |
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38 | #include "config.h" |
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39 | #endif |
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40 | |
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41 | #include <rtems/score/percpu.h> |
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42 | #include <rtems/counter.h> |
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43 | |
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44 | bool _Per_CPU_State_wait_for_non_initial_state( |
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45 | uint32_t cpu_index, |
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46 | uint32_t timeout_in_ns |
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47 | ) |
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48 | { |
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49 | const Per_CPU_Control *cpu; |
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50 | Per_CPU_State state; |
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51 | |
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52 | cpu = _Per_CPU_Get_by_index( cpu_index ); |
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53 | state = _Per_CPU_Get_state( cpu ); |
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54 | |
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55 | if ( timeout_in_ns > 0 ) { |
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56 | rtems_counter_ticks ticks = |
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57 | rtems_counter_nanoseconds_to_ticks( timeout_in_ns ); |
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58 | rtems_counter_ticks a = rtems_counter_read(); |
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59 | rtems_counter_ticks delta = 0; |
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60 | |
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61 | while ( ticks > delta && state == PER_CPU_STATE_INITIAL ) { |
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62 | rtems_counter_ticks b; |
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63 | |
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64 | state = _Per_CPU_Get_state( cpu ); |
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65 | |
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66 | ticks -= delta; |
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67 | b = rtems_counter_read(); |
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68 | delta = rtems_counter_difference( b, a ); |
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69 | a = b; |
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70 | } |
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71 | } else { |
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72 | while ( state == PER_CPU_STATE_INITIAL ) { |
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73 | state = _Per_CPU_Get_state( cpu ); |
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74 | } |
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75 | } |
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76 | |
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77 | return state != PER_CPU_STATE_INITIAL; |
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78 | } |
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