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comparison src/cs/system/main/gcc/int_dummy.S @ 0:92470e5d0b9e

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src: partial import from FC Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 15 May 2020 01:28:16 +0000
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-1:000000000000 0:92470e5d0b9e
1 /*
2 * This assembly module contains a few dummy INT_*() functions
3 * which are needed by Nucleus (tcc.c) but aren't used in TI's
4 * environment. This code used to be in the big messy int.s
5 * assembly module in the original version.
6 */
7
8 .text
9 .code 32
10
11 /*************************************************************************/
12 /* */
13 /* FUNCTION */
14 /* */
15 /* INT_Vectors_Loaded */
16 /* */
17 /* DESCRIPTION */
18 /* */
19 /* This function returns the flag that indicates whether or not */
20 /* all the default vectors have been loaded. If it is false, */
21 /* each LISR register also loads the ISR shell into the actual */
22 /* vector table. */
23 /* */
24 /* AUTHOR */
25 /* */
26 /* Barry Sellew, Accelerated Technology, Inc. */
27 /* */
28 /* CALLED BY */
29 /* */
30 /* TCC_Register_LISR Register LISR for vector */
31 /* */
32 /* CALLS */
33 /* */
34 /* None */
35 /* */
36 /* INPUTS */
37 /* */
38 /* None */
39 /* */
40 /* OUTPUTS */
41 /* */
42 /* None */
43 /* */
44 /* HISTORY */
45 /* */
46 /* NAME DATE REMARKS */
47 /* */
48 /* B. Sellew 01-19-1996 Created initial version 1.0 */
49 /* B. Sellew 01-22-1996 Verified version 1.0 */
50 /* */
51 /*************************************************************************/
52
53 @INT INT_Vectors_Loaded(void)
54 @{
55 .globl INT_Vectors_Loaded
56 INT_Vectors_Loaded:
57 @
58 @ /* Just return the loaded vectors flag. */
59 @ return(INT_Loaded_Flag);
60 @
61 MOV a1,#1 @ Always return TRUE since there
62 @ are really only two normal
63 @ vectors IRQ & FIQ
64 BX lr @ Return to caller
65 @}
66
67
68 /*************************************************************************/
69 /* */
70 /* FUNCTION */
71 /* */
72 /* INT_Setup_Vector */
73 /* */
74 /* DESCRIPTION */
75 /* */
76 /* This function sets up the specified vector with the new vector */
77 /* value. The previous vector value is returned to the caller. */
78 /* */
79 /* AUTHOR */
80 /* */
81 /* Barry Sellew, Accelerated Technology, Inc. */
82 /* */
83 /* CALLED BY */
84 /* */
85 /* Application */
86 /* TCC_Register_LISR Register LISR for vector */
87 /* */
88 /* CALLS */
89 /* */
90 /* None */
91 /* */
92 /* INPUTS */
93 /* */
94 /* vector Vector number to setup */
95 /* new Pointer to new assembly */
96 /* language ISR */
97 /* */
98 /* OUTPUTS */
99 /* */
100 /* old vector contents */
101 /* */
102 /* HISTORY */
103 /* */
104 /* NAME DATE REMARKS */
105 /* */
106 /* B. Sellew 01-19-1996 Created initial version 1.0 */
107 /* B. Sellew 01-22-1996 Verified version 1.0 */
108 /* */
109 /*************************************************************************/
110
111 @VOID *INT_Setup_Vector(INT vector, VOID *new)
112 @{
113 .globl INT_Setup_Vector
114 INT_Setup_Vector:
115 @
116 @VOID *old_vector; /* Old interrupt vector */
117 @VOID **vector_table; /* Pointer to vector table */
118 @
119 @ /* Calculate the starting address of the actual vector table. */
120 @ vector_table = (VOID **) 0;
121 @
122 @ /* Pickup the old interrupt vector. */
123 @ old_vector = vector_table[vector];
124 @
125 @ /* Setup the new interrupt vector. */
126 @ vector_table[vector] = new;
127 @
128 @ /* Return the old interrupt vector. */
129 @ return(old_vector);
130 @
131 MOV a1,#0 @ This routine is not applicable to
132 @ THUMB, return a NULL pointer
133 BX lr @ Return to caller
134 @}
135
136
137 /*************************************************************************/
138 /* */
139 /* FUNCTION */
140 /* */
141 /* INT_Retrieve_Shell */
142 /* */
143 /* DESCRIPTION */
144 /* */
145 /* This function retrieves the pointer to the shell interrupt */
146 /* service routine. The shell interrupt service routine calls */
147 /* the LISR dispatch routine. */
148 /* */
149 /* AUTHOR */
150 /* */
151 /* Barry Sellew, Accelerated Technology, Inc. */
152 /* */
153 /* CALLED BY */
154 /* */
155 /* TCC_Register_LISR Register LISR for vector */
156 /* */
157 /* CALLS */
158 /* */
159 /* None */
160 /* */
161 /* INPUTS */
162 /* */
163 /* vector Vector number to setup */
164 /* */
165 /* OUTPUTS */
166 /* */
167 /* shell pointer */
168 /* */
169 /* HISTORY */
170 /* */
171 /* NAME DATE REMARKS */
172 /* */
173 /* B. Sellew 01-19-1996 Created initial version 1.0 */
174 /* B. Sellew 01-22-1996 Verified version 1.0 */
175 /* */
176 /*************************************************************************/
177
178 @VOID *INT_Retrieve_Shell(INT vector)
179 @{
180 .globl INT_Retrieve_Shell
181 INT_Retrieve_Shell:
182 @
183 @ /* Return the LISR Shell interrupt routine. */
184 @ return(INT_Vectors[vector]);
185 @
186 MOV a1,#0 @ This routine is not applicable to
187 @ THUMB, return a NULL pointer
188 BX lr @ Return to caller
189 @}