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 #define TX_THREAD_SMP_SOURCE_CODE
25
26
27 /* Include necessary system files. */
28
29 #include "tx_api.h"
30 #include "tx_initialize.h"
31 #include "tx_thread.h"
32 #include "tx_timer.h"
33
34
35 /* Define any port-specific scheduling data structures. */
36
37 TX_PORT_SPECIFIC_DATA
38
39
40 #ifdef TX_SAFETY_CRITICAL
41 TX_SAFETY_CRITICAL_EXCEPTION_HANDLER
42 #endif
43
44
45 /**************************************************************************/
46 /* */
47 /* FUNCTION RELEASE */
48 /* */
49 /* _tx_initialize_kernel_enter PORTABLE SMP */
50 /* 6.3.0 */
51 /* AUTHOR */
52 /* */
53 /* William E. Lamie, Microsoft Corporation */
54 /* */
55 /* DESCRIPTION */
56 /* */
57 /* This function is the first ThreadX function called during */
58 /* initialization. It is called from the application's "main()" */
59 /* function. It is important to note that this routine never */
60 /* returns. The processing of this function is relatively simple: */
61 /* it calls several ThreadX initialization functions (if needed), */
62 /* calls the application define function, and then invokes the */
63 /* scheduler. */
64 /* */
65 /* INPUT */
66 /* */
67 /* None */
68 /* */
69 /* OUTPUT */
70 /* */
71 /* None */
72 /* */
73 /* CALLS */
74 /* */
75 /* _tx_thread_smp_high_level_initialize SMP initialization */
76 /* _tx_thread_smp_current_state_set Set system state for all cores */
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 /* 09-30-2020 William E. Lamie Initial Version 6.1 */
91 /* 10-31-2023 Xiuwen Cai Modified comment(s), */
92 /* added random generator */
93 /* initialization, */
94 /* resulting in version 6.3.0 */
95 /* */
96 /**************************************************************************/
_tx_initialize_kernel_enter(VOID)97 VOID _tx_initialize_kernel_enter(VOID)
98 {
99
100 ULONG other_core_status, i;
101
102
103 /* Determine if the compiler has pre-initialized ThreadX. */
104 if (_tx_thread_system_state[0] != TX_INITIALIZE_ALMOST_DONE)
105 {
106
107 /* No, the initialization still needs to take place. */
108
109 /* Ensure that the system state variable is set to indicate
110 initialization is in progress. Note that this variable is
111 later used to represent interrupt nesting. */
112 _tx_thread_smp_current_state_set(TX_INITIALIZE_IN_PROGRESS);
113
114 /* Call any port specific preprocessing. */
115 TX_PORT_SPECIFIC_PRE_INITIALIZATION
116
117 /* Invoke the low-level initialization to handle all processor specific
118 initialization issues. */
119 _tx_initialize_low_level();
120
121 /* Call the high-level SMP Initialization. */
122 _tx_thread_smp_high_level_initialize();
123
124 /* Invoke the high-level initialization to exercise all of the
125 ThreadX components and the application's initialization
126 function. */
127 _tx_initialize_high_level();
128
129 /* Call any port specific post-processing. */
130 TX_PORT_SPECIFIC_POST_INITIALIZATION
131 }
132
133 /* Optional processing extension. */
134 TX_INITIALIZE_KERNEL_ENTER_EXTENSION
135
136 /* Ensure that the system state variable is set to indicate
137 initialization is in progress. Note that this variable is
138 later used to represent interrupt nesting. */
139 _tx_thread_system_state[0] = TX_INITIALIZE_IN_PROGRESS;
140
141 /* Optional random number generator initialization. */
142 TX_INITIALIZE_RANDOM_GENERATOR_INITIALIZATION
143
144 /* Call the application provided initialization function. Pass the
145 first available memory address to it. */
146 tx_application_define(_tx_initialize_unused_memory);
147
148 /* Call any port specific pre-scheduler processing. */
149 TX_PORT_SPECIFIC_PRE_SCHEDULER_INITIALIZATION
150
151 /* Now wait for all cores to become ready for scheduling. */
152 do
153 {
154
155 /* Release the other cores from initialization. */
156 _tx_thread_smp_release_cores_flag = TX_TRUE;
157
158 /* Add all the status together... Other cores must clear their system
159 state before they they are released. */
160 other_core_status = ((ULONG) 0);
161
162 #ifndef TX_THREAD_SMP_DYNAMIC_CORE_MAX
163 for (i = ((ULONG) 1); i < ((ULONG) TX_THREAD_SMP_MAX_CORES); i++)
164 #else
165 for (i = ((ULONG) 1); i < _tx_thread_smp_max_cores; i++)
166 #endif
167 {
168
169
170 /* Call port-specific memory synchronization primitive. */
171 TX_PORT_SPECIFIC_MEMORY_SYNCHRONIZATION
172
173 /* Add the states of each subsequent core. */
174 other_core_status = other_core_status + _tx_thread_system_state[i];
175 }
176
177 } while (other_core_status != ((ULONG) 0));
178
179 /* Set the system state in preparation for entering the thread
180 scheduler. */
181 _tx_thread_system_state[0] = TX_INITIALIZE_IS_FINISHED;
182
183 /* Call port-specific memory synchronization primitive. */
184 TX_PORT_SPECIFIC_MEMORY_SYNCHRONIZATION
185
186 /* Enter the scheduling loop to start executing threads! */
187 _tx_thread_schedule();
188
189 #ifdef TX_SAFETY_CRITICAL
190
191 /* If we ever get here, raise safety critical exception. */
192 TX_SAFETY_CRITICAL_EXCEPTION(__FILE__, __LINE__, 0);
193 #endif
194 }
195
196
