1 | /* |
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2 | * ISR Handler |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * All rights assigned to U.S. Government, 1994. |
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8 | * |
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9 | * This material may be reproduced by or for the U.S. Government pursuant |
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10 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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11 | * notice must appear in all copies of this file and its derivatives. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/score/isr.h> |
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18 | #include <rtems/score/stack.h> |
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19 | #include <rtems/score/interr.h> |
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20 | #include <rtems/score/wkspace.h> |
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21 | |
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22 | /* _ISR_Handler_initialization |
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23 | * |
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24 | * This routine initializes the ISR handler. |
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25 | * |
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26 | * Input parameters: NONE |
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27 | * |
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28 | * Output parameters: NONE |
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29 | */ |
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30 | |
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31 | void _ISR_Handler_initialization( void ) |
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32 | { |
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33 | _ISR_Signals_to_thread_executing = FALSE; |
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34 | |
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35 | _ISR_Nest_level = 0; |
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36 | |
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37 | #if ( CPU_ALLOCATE_INTERRUPT_STACK == TRUE ) |
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38 | |
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39 | if ( _CPU_Table.interrupt_stack_size < STACK_MINIMUM_SIZE ) |
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40 | _Internal_error_Occurred( |
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41 | INTERNAL_ERROR_CORE, |
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42 | TRUE, |
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43 | INTERNAL_ERROR_INTERRUPT_STACK_TOO_SMALL |
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44 | ); |
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45 | |
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46 | _CPU_Interrupt_stack_low = |
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47 | _Workspace_Allocate_or_fatal_error( _CPU_Table.interrupt_stack_size ); |
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48 | |
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49 | _CPU_Interrupt_stack_high = _Addresses_Add_offset( |
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50 | _CPU_Interrupt_stack_low, |
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51 | _CPU_Table.interrupt_stack_size |
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52 | ); |
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53 | |
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54 | #endif |
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55 | |
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56 | #if ( CPU_HAS_HARDWARE_INTERRUPT_STACK == TRUE ) |
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57 | _CPU_Install_interrupt_stack(); |
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58 | #endif |
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59 | |
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60 | } |
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