1 /**************************************************************************/
2 /* */
3 /* Copyright (c) Microsoft Corporation. All rights reserved. */
4 /* */
5 /* This software is licensed under the Microsoft Software License */
6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */
7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
8 /* and in the root directory of this software. */
9 /* */
10 /**************************************************************************/
11
12
13 /**************************************************************************/
14 /**************************************************************************/
15 /** */
16 /** ThreadX Component */
17 /** */
18 /** Initialize */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23 #define TX_SOURCE_CODE
24
25
26 /* Include necessary system files. */
27
28 #include "tx_api.h"
29 #include "tx_initialize.h"
30 #include "tx_thread.h"
31 #include "tx_timer.h"
32
33 #if defined(TX_ENABLE_EXECUTION_CHANGE_NOTIFY) || defined(TX_EXECUTION_PROFILE_ENABLE)
34 extern VOID _tx_execution_initialize(VOID);
35 #endif
36
37 /* Define any port-specific scheduling data structures. */
38
39 TX_PORT_SPECIFIC_DATA
40
41
42 #ifdef TX_SAFETY_CRITICAL
43 TX_SAFETY_CRITICAL_EXCEPTION_HANDLER
44 #endif
45
46
47 /**************************************************************************/
48 /* */
49 /* FUNCTION RELEASE */
50 /* */
51 /* _tx_initialize_kernel_enter PORTABLE C */
52 /* 6.1.11 */
53 /* AUTHOR */
54 /* */
55 /* William E. Lamie, Microsoft Corporation */
56 /* */
57 /* DESCRIPTION */
58 /* */
59 /* This function is the first ThreadX function called during */
60 /* initialization. It is called from the application's "main()" */
61 /* function. It is important to note that this routine never */
62 /* returns. The processing of this function is relatively simple: */
63 /* it calls several ThreadX initialization functions (if needed), */
64 /* calls the application define function, and then invokes the */
65 /* scheduler. */
66 /* */
67 /* INPUT */
68 /* */
69 /* None */
70 /* */
71 /* OUTPUT */
72 /* */
73 /* None */
74 /* */
75 /* CALLS */
76 /* */
77 /* _tx_initialize_low_level Low-level initialization */
78 /* _tx_initialize_high_level High-level initialization */
79 /* tx_application_define Application define function */
80 /* _tx_thread_scheduler ThreadX scheduling loop */
81 /* */
82 /* CALLED BY */
83 /* */
84 /* main Application main program */
85 /* */
86 /* RELEASE HISTORY */
87 /* */
88 /* DATE NAME DESCRIPTION */
89 /* */
90 /* 05-19-2020 William E. Lamie Initial Version 6.0 */
91 /* 09-30-2020 Yuxin Zhou Modified comment(s), */
92 /* resulting in version 6.1 */
93 /* 04-25-2022 Scott Larson Modified comment(s), */
94 /* added EPK initialization, */
95 /* resulting in version 6.1.11 */
96 /* */
97 /**************************************************************************/
_tx_initialize_kernel_enter(VOID)98 VOID _tx_initialize_kernel_enter(VOID)
99 {
100
101 /* Determine if the compiler has pre-initialized ThreadX. */
102 if (_tx_thread_system_state != TX_INITIALIZE_ALMOST_DONE)
103 {
104
105 /* No, the initialization still needs to take place. */
106
107 /* Ensure that the system state variable is set to indicate
108 initialization is in progress. Note that this variable is
109 later used to represent interrupt nesting. */
110 _tx_thread_system_state = TX_INITIALIZE_IN_PROGRESS;
111
112 /* Call any port specific preprocessing. */
113 TX_PORT_SPECIFIC_PRE_INITIALIZATION
114
115 /* Invoke the low-level initialization to handle all processor specific
116 initialization issues. */
117 _tx_initialize_low_level();
118
119 /* Invoke the high-level initialization to exercise all of the
120 ThreadX components and the application's initialization
121 function. */
122 _tx_initialize_high_level();
123
124 /* Call any port specific post-processing. */
125 TX_PORT_SPECIFIC_POST_INITIALIZATION
126 }
127
128 /* Optional processing extension. */
129 TX_INITIALIZE_KERNEL_ENTER_EXTENSION
130
131 /* Ensure that the system state variable is set to indicate
132 initialization is in progress. Note that this variable is
133 later used to represent interrupt nesting. */
134 _tx_thread_system_state = TX_INITIALIZE_IN_PROGRESS;
135
136 /* Call the application provided initialization function. Pass the
137 first available memory address to it. */
138 tx_application_define(_tx_initialize_unused_memory);
139
140 /* Set the system state in preparation for entering the thread
141 scheduler. */
142 _tx_thread_system_state = TX_INITIALIZE_IS_FINISHED;
143
144 /* Call any port specific pre-scheduler processing. */
145 TX_PORT_SPECIFIC_PRE_SCHEDULER_INITIALIZATION
146
147 #if defined(TX_ENABLE_EXECUTION_CHANGE_NOTIFY) || defined(TX_EXECUTION_PROFILE_ENABLE)
148 /* Initialize Execution Profile Kit. */
149 _tx_execution_initialize();
150 #endif
151
152 /* Enter the scheduling loop to start executing threads! */
153 _tx_thread_schedule();
154
155 #ifdef TX_SAFETY_CRITICAL
156
157 /* If we ever get here, raise safety critical exception. */
158 TX_SAFETY_CRITICAL_EXCEPTION(__FILE__, __LINE__, 0);
159 #endif
160 }
161
162
