1 | /* |
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2 | * The license and distribution terms for this file may be |
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3 | * found in the file LICENSE in this distribution or at |
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4 | * http://www.rtems.org/license/LICENSE. |
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5 | */ |
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6 | |
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7 | #ifndef IRQ_SHARED_IRQ_C_GLUE_H |
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8 | #define IRQ_SHARED_IRQ_C_GLUE_H |
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9 | /* |
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10 | * This header describes the routines that are needed by the shared |
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11 | * version of 'irq.c' (implementing the RTEMS irq API). They |
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12 | * must be provided by the BSP. |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | * |
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18 | */ |
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19 | |
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20 | #ifndef BSP_SHARED_HANDLER_SUPPORT |
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21 | #define BSP_SHARED_HANDLER_SUPPORT 1 |
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22 | #endif |
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23 | |
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24 | #include <rtems.h> |
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25 | #include <rtems/irq.h> |
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26 | |
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27 | #include <bsp/vectors.h> |
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28 | |
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29 | #ifdef __cplusplus |
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30 | extern "C" { |
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31 | #endif |
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32 | |
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33 | /* |
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34 | * PIC-independent functions to enable/disable interrupt lines at |
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35 | * the pic. |
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36 | * |
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37 | * NOTE: the routines must ignore requests for enabling/disabling |
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38 | * interrupts that are outside of the range handled by the |
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39 | * PIC(s). |
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40 | */ |
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41 | extern void BSP_enable_irq_at_pic(const rtems_irq_number irqLine); |
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42 | /* |
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43 | * RETURNS: nonzero (> 0 ) if irq was enabled originally, zero if irq |
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44 | * was off and negative value if there was an error. |
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45 | */ |
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46 | extern int BSP_disable_irq_at_pic(const rtems_irq_number irqLine); |
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47 | |
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48 | /* |
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49 | * Initialize the PIC. |
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50 | */ |
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51 | extern int BSP_setup_the_pic(rtems_irq_global_settings* config); |
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52 | |
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53 | /* IRQ dispatcher to be defined by the PIC driver; note that it MUST |
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54 | * implement shared interrupts. |
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55 | * Note also that the exception frame passed to this handler is not very |
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56 | * meaningful. Only the volatile registers and vector info are stored. |
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57 | * |
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58 | ******************************************************************* |
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59 | * The routine must return zero if the interrupt was handled. If a |
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60 | * nonzero value is returned the dispatcher may panic and flag an |
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61 | * uncaught exception. |
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62 | ******************************************************************* |
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63 | */ |
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64 | int C_dispatch_irq_handler (BSP_Exception_frame *frame, unsigned int excNum); |
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65 | |
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66 | /* |
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67 | * Snippet to be used by PIC drivers and by bsp_irq_dispatch_list |
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68 | * traverses list of shared handlers for a given interrupt |
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69 | * |
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70 | */ |
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71 | |
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72 | static inline void |
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73 | bsp_irq_dispatch_list_base( |
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74 | rtems_irq_connect_data *tbl, |
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75 | unsigned irq, |
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76 | rtems_irq_hdl sentinel |
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77 | ) |
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78 | { |
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79 | rtems_irq_connect_data* vchain; |
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80 | for( vchain = &tbl[irq]; |
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81 | ((intptr_t)vchain != -1 && vchain->hdl != sentinel); |
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82 | vchain = (rtems_irq_connect_data*)vchain->next_handler ) |
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83 | { |
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84 | vchain->hdl(vchain->handle); |
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85 | } |
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86 | } |
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87 | |
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88 | |
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89 | /* |
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90 | * Snippet to be used by PIC drivers; |
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91 | * enables interrupts, traverses list of |
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92 | * shared handlers for a given interrupt |
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93 | * and restores original irq level |
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94 | * |
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95 | * Note that _ISR_Get_level() & friends are preferable to |
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96 | * manipulating MSR directly. |
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97 | */ |
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98 | |
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99 | static inline void |
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100 | bsp_irq_dispatch_list( |
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101 | rtems_irq_connect_data *tbl, |
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102 | unsigned irq, |
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103 | rtems_irq_hdl sentinel |
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104 | ) |
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105 | { |
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106 | register uint32_t l_orig; |
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107 | |
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108 | l_orig = _ISR_Get_level(); |
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109 | |
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110 | /* Enable all interrupts */ |
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111 | _ISR_Set_level(0); |
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112 | |
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113 | |
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114 | bsp_irq_dispatch_list_base( tbl, irq, sentinel ); |
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115 | |
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116 | /* Restore original level */ |
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117 | _ISR_Set_level(l_orig); |
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118 | } |
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119 | |
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120 | #ifdef __cplusplus |
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121 | } |
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122 | #endif |
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123 | |
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124 | #endif |
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