1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief LM32 Initialize the ISR Handler |
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5 | */ |
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6 | |
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7 | /* |
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8 | * COPYRIGHT (c) 1989-2009. |
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9 | * On-Line Applications Research Corporation (OAR). |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.org/license/LICENSE. |
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14 | */ |
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15 | |
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16 | #ifdef HAVE_CONFIG_H |
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17 | #include "config.h" |
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18 | #endif |
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19 | |
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20 | #include <rtems/score/isr.h> |
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21 | #include <rtems/score/percpu.h> |
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22 | #include <rtems/score/threaddispatch.h> |
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23 | |
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24 | #if( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE) |
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25 | unsigned long *_old_stack_ptr; |
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26 | #endif |
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27 | |
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28 | void *_exception_stack_frame; |
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29 | |
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30 | register unsigned long *stack_ptr __asm__ ("sp"); |
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31 | |
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32 | /* |
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33 | * Prototypes for routines called from assembly that we don't want in |
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34 | * the public name space. |
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35 | */ |
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36 | void __ISR_Handler(uint32_t vector, CPU_Interrupt_frame *ifr); |
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37 | |
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38 | void __ISR_Handler(uint32_t vector, CPU_Interrupt_frame *ifr) |
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39 | { |
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40 | register uint32_t level; |
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41 | _exception_stack_frame = NULL; |
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42 | |
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43 | /* Interrupts are disabled upon entry to this Handler */ |
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44 | |
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45 | _Thread_Dispatch_increment_disable_level(); |
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46 | |
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47 | #if( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE) |
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48 | if ( _ISR_Nest_level == 0 ) { |
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49 | /* Install irq stack */ |
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50 | _old_stack_ptr = stack_ptr; |
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51 | stack_ptr = _CPU_Interrupt_stack_high - 4; |
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52 | } |
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53 | #endif |
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54 | |
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55 | _ISR_Nest_level++; |
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56 | |
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57 | if ( _ISR_Vector_table[ vector] ) |
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58 | { |
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59 | (*_ISR_Vector_table[ vector ])(vector, ifr); |
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60 | }; |
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61 | |
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62 | /* Make sure that interrupts are disabled again */ |
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63 | _CPU_ISR_Disable( level ); |
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64 | |
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65 | _ISR_Nest_level--; |
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66 | |
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67 | #if( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE) |
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68 | if( _ISR_Nest_level == 0) |
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69 | stack_ptr = _old_stack_ptr; |
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70 | #endif |
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71 | |
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72 | _Thread_Dispatch_decrement_disable_level(); |
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73 | |
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74 | _CPU_ISR_Enable( level ); |
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75 | |
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76 | if ( _ISR_Nest_level ) |
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77 | return; |
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78 | |
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79 | if ( _Thread_Dispatch_necessary && _Thread_Dispatch_is_enabled() ) { |
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80 | /* save off our stack frame so the context switcher can get to it */ |
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81 | _exception_stack_frame = ifr; |
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82 | |
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83 | _Thread_Dispatch(); |
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84 | |
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85 | /* and make sure its clear in case we didn't dispatch. if we did, its |
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86 | * already cleared */ |
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87 | _exception_stack_frame = NULL; |
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88 | } |
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89 | } |
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90 | |
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