1 | /* genpvec.c |
---|
2 | * |
---|
3 | * These routines handle the external exception. Multiple ISRs occur off |
---|
4 | * of this one interrupt. This method will allow multiple ISRs to be |
---|
5 | * called using the same IRQ index. However, removing the ISR routines is |
---|
6 | * presently not supported. |
---|
7 | * |
---|
8 | * The external exception vector numbers begin with DMV170_IRQ_FIRST. |
---|
9 | * DMV170_IRQ_FIRST is defined to be one greater than the last processor |
---|
10 | * interrupt. |
---|
11 | * |
---|
12 | * COPYRIGHT (c) 1989-1998. |
---|
13 | * On-Line Applications Research Corporation (OAR). |
---|
14 | * Copyright assigned to U.S. Government, 1994. |
---|
15 | * |
---|
16 | * The license and distribution terms for this file may in |
---|
17 | * the file LICENSE in this distribution or at |
---|
18 | * http://www.OARcorp.com/rtems/license.html. |
---|
19 | * |
---|
20 | * $Id: |
---|
21 | */ |
---|
22 | |
---|
23 | #include <bsp.h> |
---|
24 | #include "chain.h" |
---|
25 | #include <assert.h> |
---|
26 | |
---|
27 | #define NUM_LIRQ_HANDLERS 20 |
---|
28 | #define NUM_LIRQ ( MAX_BOARD_IRQS - PPC_IRQ_LAST ) |
---|
29 | |
---|
30 | /* |
---|
31 | * Structure to for one of possible multiple interrupt handlers for |
---|
32 | * a given interrupt. |
---|
33 | */ |
---|
34 | typedef struct |
---|
35 | { |
---|
36 | Chain_Node Node; |
---|
37 | rtems_isr_entry handler; /* isr routine */ |
---|
38 | rtems_vector_number vector; /* vector number */ |
---|
39 | } EE_ISR_Type; |
---|
40 | |
---|
41 | /* |
---|
42 | * Note: The following will not work if we add a method to remove |
---|
43 | * handlers at a later time. |
---|
44 | */ |
---|
45 | EE_ISR_Type ISR_Nodes [NUM_LIRQ_HANDLERS]; |
---|
46 | rtems_unsigned16 Nodes_Used; |
---|
47 | Chain_Control ISR_Array [NUM_LIRQ]; |
---|
48 | |
---|
49 | /*PAGE |
---|
50 | * |
---|
51 | * external_exception_ISR |
---|
52 | * |
---|
53 | * This interrupt service routine is called for an External Exception. |
---|
54 | * |
---|
55 | * Input parameters: |
---|
56 | * vector - vector number representing the external exception vector. |
---|
57 | * |
---|
58 | * Output parameters: NONE |
---|
59 | * |
---|
60 | * Return values: |
---|
61 | */ |
---|
62 | |
---|
63 | rtems_isr external_exception_ISR ( |
---|
64 | rtems_vector_number vector /* IN */ |
---|
65 | ) |
---|
66 | { |
---|
67 | rtems_unsigned16 index; |
---|
68 | Chain_Node *node; |
---|
69 | EE_ISR_Type *ee_isr; |
---|
70 | |
---|
71 | /* |
---|
72 | * Read vector. |
---|
73 | */ |
---|
74 | index = 0; |
---|
75 | |
---|
76 | node = ISR_Array[ index ].first; |
---|
77 | while ( !_Chain_Is_tail( &ISR_Array[ index ], node ) ) { |
---|
78 | ee_isr = (EE_ISR_Type *) node; |
---|
79 | (*ee_isr->handler)( ee_isr->vector ); |
---|
80 | node = node->next; |
---|
81 | } |
---|
82 | |
---|
83 | /* |
---|
84 | * Clear the interrupt. |
---|
85 | */ |
---|
86 | } |
---|
87 | |
---|
88 | |
---|
89 | /*PAGE |
---|
90 | * |
---|
91 | * initialize_external_exception_vector |
---|
92 | * |
---|
93 | * This routine initializes the external exception vector |
---|
94 | * |
---|
95 | * Input parameters: NONE |
---|
96 | * |
---|
97 | * Output parameters: NONE |
---|
98 | * |
---|
99 | * Return values: NONE |
---|
100 | */ |
---|
101 | |
---|
102 | void initialize_external_exception_vector () |
---|
103 | { |
---|
104 | int i; |
---|
105 | rtems_isr_entry previous_isr; |
---|
106 | rtems_status_code status; |
---|
107 | |
---|
108 | Nodes_Used = 0; |
---|
109 | |
---|
110 | for (i=0; i <NUM_LIRQ; i++) |
---|
111 | Chain_Initialize_empty( &ISR_Array[i] ); |
---|
112 | |
---|
113 | /* |
---|
114 | * Install external_exception_ISR () as the handler for |
---|
115 | * the General Purpose Interrupt. |
---|
116 | */ |
---|
117 | |
---|
118 | status = rtems_interrupt_catch( external_exception_ISR, |
---|
119 | PPC_IRQ_EXTERNAL , (rtems_isr_entry *) &previous_isr ); |
---|
120 | } |
---|
121 | |
---|
122 | /*PAGE |
---|
123 | * |
---|
124 | * set_EE_vector |
---|
125 | * |
---|
126 | * This routine installs one of multiple ISRs for the general purpose |
---|
127 | * inerrupt. |
---|
128 | * |
---|
129 | * Input parameters: |
---|
130 | * handler - handler to call at exception |
---|
131 | * vector - vector number associated with this handler. |
---|
132 | * |
---|
133 | * Output parameters: NONE |
---|
134 | * |
---|
135 | * Return values: |
---|
136 | */ |
---|
137 | |
---|
138 | rtems_isr_entry set_EE_vector( |
---|
139 | rtems_isr_entry handler, /* isr routine */ |
---|
140 | rtems_vector_number vector /* vector number */ |
---|
141 | ) |
---|
142 | { |
---|
143 | rtems_unsigned16 vec_idx = vector - DMV170_IRQ_FIRST; |
---|
144 | rtems_unsigned32 index; |
---|
145 | |
---|
146 | /* |
---|
147 | * Verify that all of the nodes have not been used. |
---|
148 | */ |
---|
149 | assert (Nodes_Used < NUM_LIRQ_HANDLERS); |
---|
150 | |
---|
151 | /* |
---|
152 | * If we have already installed this handler for this vector, then |
---|
153 | * just reset it. |
---|
154 | */ |
---|
155 | |
---|
156 | for ( index=0 ; index <= Nodes_Used ; index++ ) { |
---|
157 | if ( ISR_Nodes[index].vector == vector && |
---|
158 | ISR_Nodes[index].handler == handler ) |
---|
159 | return 0; |
---|
160 | } |
---|
161 | |
---|
162 | /* |
---|
163 | * Increment the number of nedes used and set the index for the node |
---|
164 | * array. |
---|
165 | */ |
---|
166 | |
---|
167 | Nodes_Used++; |
---|
168 | index = Nodes_Used - 1; |
---|
169 | |
---|
170 | /* |
---|
171 | * Write the values of the handler and the vector to this node. |
---|
172 | */ |
---|
173 | ISR_Nodes[index].handler = handler; |
---|
174 | ISR_Nodes[index].vector = vector; |
---|
175 | |
---|
176 | /* |
---|
177 | * Connect this node to the chain at the location of the |
---|
178 | * vector index. |
---|
179 | */ |
---|
180 | Chain_Append( &ISR_Array[vec_idx], &ISR_Nodes[index].Node ); |
---|
181 | |
---|
182 | /* |
---|
183 | * No interrupt service routine was removed so return 0 |
---|
184 | */ |
---|
185 | return 0; |
---|
186 | } |
---|
187 | |
---|