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32 33 34 35 36
37 package ti.sysbios.gates
38
39 import xdc.rov.ViewInfo;
40 import xdc.runtime.Assert;
41
42 /*!
43 * ======== GateSwi ========
44 * Software Interrupt Gate.
45 *
46 * GateSwi uses disabling and enabling of software interrupts as the
47 * resource locking mechanism. This gate can be used whenever the resource
48 * is being shared by Swis or Tasks. This gate cannot be used by a Hwi.
49 *
50 * The duration between the enter and leave should be as short as possible
51 * to minimize Swi latency.
52 *
53 * GateSwi inherits from xdc.runtime.IGateProvider, therefore supports nesting.
54 *
55 * @p(html)
56 * <h3> Calling Context </h3>
57 * <table border="1" cellpadding="3">
58 * <colgroup span="1"></colgroup> <colgroup span="5" align="center">
59 * </colgroup>
60 *
61 * <tr><th> Function </th><th> Hwi </th><th> Swi </th><th> Task </th>
62 * <th> Main </th><th> Startup </th></tr>
63 * <!-- -->
64 * <tr><td> {@link #Params_init} </td><td> Y </td><td> Y </td>
65 * <td> Y </td><td> Y </td><td> Y </td></tr>
66 * <tr><td> {@link #query} </td><td> Y </td><td> Y </td>
67 * <td> Y </td><td> Y </td><td> Y </td></tr>
68 * <tr><td> {@link #construct} </td><td> Y </td><td> Y </td>
69 * <td> Y </td><td> Y </td><td> N </td></tr>
70 * <tr><td> {@link #create} </td><td> N* </td><td> N* </td>
71 * <td> Y </td><td> Y </td><td> N </td></tr>
72 * <tr><td> {@link #delete} </td><td> N* </td><td> N* </td>
73 * <td> Y </td><td> Y </td><td> N </td></tr>
74 * <tr><td> {@link #destruct} </td><td> Y </td><td> Y </td>
75 * <td> Y </td><td> Y </td><td> N </td></tr>
76 * <tr><td> {@link #enter} </td><td> N </td><td> Y </td>
77 * <td> Y </td><td> Y** </td><td> N </td></tr>
78 * <tr><td> {@link #leave} </td><td> N </td><td> Y </td>
79 * <td> Y </td><td> Y** </td><td> N </td></tr>
80 * <tr><td colspan="6"> Definitions: <br />
81 * <ul>
82 * <li> <b>Hwi</b>: API is callable from a Hwi thread. </li>
83 * <li> <b>Swi</b>: API is callable from a Swi thread. </li>
84 * <li> <b>Task</b>: API is callable from a Task thread. </li>
85 * <li> <b>Main</b>: API is callable during any of these phases: </li>
86 * <ul>
87 * <li> In your module startup after this module is started
88 * (e.g. GateSwi_Module_startupDone() returns TRUE). </li>
89 * <li> During xdc.runtime.Startup.lastFxns. </li>
90 * <li> During main().</li>
91 * <li> During BIOS.startupFxns.</li>
92 * </ul>
93 * <li> <b>Startup</b>: API is callable during any of these phases:</li>
94 * <ul>
95 * <li> During xdc.runtime.Startup.firstFxns.</li>
96 * <li> In your module startup before this module is started
97 * (e.g. GateSwi_Module_startupDone() returns FALSE).</li>
98 * </ul>
99 * <li> <b>*</b>: Assuming blocking Heap is used for creation. </li>
100 * <li> <b>**</b>: Must be used in enter/leave pairs. </li>
101 * </ul>
102 * </td></tr>
103 *
104 * </table>
105 * @p
106 */
107
108 module GateSwi inherits xdc.runtime.IGateProvider
109 {
110
111 /*!
112 * ======== BasicView ========
113 * @_nodoc
114 */
115 metaonly struct BasicView {
116 String label;
117 }
118
119 /*!
120 * ======== rovViewInfo ========
121 * @_nodoc
122 */
123 @Facet
124 metaonly config ViewInfo.Instance rovViewInfo =
125 ViewInfo.create({
126 viewMap: [
127 [
128 'Basic',
129 {
130 type: ViewInfo.INSTANCE,
131 viewInitFxn: 'viewInitBasic',
132 structName: 'BasicView'
133 }
134 ],
135 ]
136 });
137
138 /*!
139 * Asserted when {@link #enter} or {@link #leave} is called from a
140 * hardware interrupt thread.
141 */
142 config Assert.Id A_badContext = {
143 msg: "A_badContext: bad calling context. May not be entered from a hardware interrupt thread."
144 };
145
146 instance:
147
148 @DirectCall
149 override IArg enter();
150
151 @DirectCall
152 override Void leave(IArg key);
153
154 internal:
155
156 /*!
157 * @_nodoc
158 * ======== Instance_State ========
159 * XDC requires this be defined, even though it's empty.
160 */
161 struct Instance_State {
162 };
163 }
164 165 166 167
168