This repository was archived by the owner on Nov 11, 2024. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 111
/
Copy pathtx_initialize_low_level.S
206 lines (188 loc) · 9.96 KB
/
tx_initialize_low_level.S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Initialize */
/** */
/**************************************************************************/
/**************************************************************************/
SYSTEM_CLOCK = 160000000
SYSTICK_CYCLES = ((SYSTEM_CLOCK / 100) -1)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_initialize_low_level Cortex-M33/GNU */
/* 6.1 */
/* AUTHOR */
/* */
/* Scott Larson, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is responsible for any low-level processor */
/* initialization, including setting up interrupt vectors, setting */
/* up a periodic timer interrupt source, saving the system stack */
/* pointer for use in ISR processing later, and finding the first */
/* available RAM memory address for tx_application_define. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _tx_initialize_kernel_enter ThreadX entry function */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 09-30-2020 Scott Larson Initial Version 6.1 */
/* */
/**************************************************************************/
// VOID _tx_initialize_low_level(VOID)
// {
.section .text
.balign 4
.syntax unified
.eabi_attribute Tag_ABI_align_preserved, 1
.global _tx_initialize_low_level
.thumb_func
.type _tx_initialize_low_level, function
_tx_initialize_low_level:
/* Disable interrupts during ThreadX initialization. */
CPSID i
/* Set base of available memory to end of non-initialised RAM area. */
#ifdef USE_DYNAMIC_MEMORY_ALLOCATION
LDR r0, =_tx_initialize_unused_memory // Build address of unused memory pointer
LDR r1, =__RAM_segment_used_end__ // Build first free address
ADD r1, r1, #4 //
STR r1, [r0] // Setup first unused memory pointer
#endif
/* Setup Vector Table Offset Register. */
MOV r0, #0xE000E000 // Build address of NVIC registers
LDR r1, =g_pfnVectors // Pickup address of vector table
STR r1, [r0, #0xD08] // Set vector table address
/* Enable the cycle count register. */
LDR r0, =0xE0001000 // Build address of DWT register
LDR r1, [r0] // Pickup the current value
ORR r1, r1, #1 // Set the CYCCNTENA bit
STR r1, [r0] // Enable the cycle count register
/* Set system stack pointer from vector value. */
LDR r0, =_tx_thread_system_stack_ptr // Build address of system stack pointer
LDR r1, =g_pfnVectors // Pickup address of vector table
LDR r1, [r1] // Pickup reset stack pointer
STR r1, [r0] // Save system stack pointer
/* Configure SysTick. */
MOV r0, #0xE000E000 // Build address of NVIC registers
LDR r1, =SYSTICK_CYCLES
STR r1, [r0, #0x14] // Setup SysTick Reload Value
MOV r1, #0x7 // Build SysTick Control Enable Value
STR r1, [r0, #0x10] // Setup SysTick Control
/* Configure handler priorities. */
LDR r1, =0x00000000 // Rsrv, UsgF, BusF, MemM
STR r1, [r0, #0xD18] // Setup System Handlers 4-7 Priority Registers
LDR r1, =0xFF000000 // SVCl, Rsrv, Rsrv, Rsrv
STR r1, [r0, #0xD1C] // Setup System Handlers 8-11 Priority Registers
// Note: SVC must be lowest priority, which is 0xFF
LDR r1, =0x40FF0000 // SysT, PnSV, Rsrv, DbgM
STR r1, [r0, #0xD20] // Setup System Handlers 12-15 Priority Registers
// Note: PnSV must be lowest priority, which is 0xFF
/* Return to caller. */
BX lr
// }
/* Define shells for each of the unused vectors. */
.section .text
.balign 4
.syntax unified
.eabi_attribute Tag_ABI_align_preserved, 1
.global __tx_BadHandler
.thumb_func
.type __tx_BadHandler, function
__tx_BadHandler:
B __tx_BadHandler
.section .text
.balign 4
.syntax unified
.eabi_attribute Tag_ABI_align_preserved, 1
.global __tx_IntHandler
.thumb_func
.type __tx_IntHandler, function
__tx_IntHandler:
// VOID InterruptHandler (VOID)
// {
PUSH {r0,lr} // Save LR (and dummy r0 to maintain stack alignment)
#if (defined(TX_ENABLE_EXECUTION_CHANGE_NOTIFY) || defined(TX_EXECUTION_PROFILE_ENABLE))
BL _tx_execution_isr_enter // Call the ISR enter function
#endif
/* Do interrupt handler work here */
/* .... */
#if (defined(TX_ENABLE_EXECUTION_CHANGE_NOTIFY) || defined(TX_EXECUTION_PROFILE_ENABLE))
BL _tx_execution_isr_exit // Call the ISR exit function
#endif
POP {r0,lr}
BX lr
// }
// NOTE: this renamed from SysTick_Handler() to TxSysTick_Handler()
// so that we can pick up SysTick_Handler() over in u_exception_handler.c
// and then daisy-chain this in
.section .text
.balign 4
.syntax unified
.eabi_attribute Tag_ABI_align_preserved, 1
.global TxSysTick_Handler
.thumb_func
.type TxSysTick_Handler, function
TxSysTick_Handler:
// VOID TimerInterruptHandler (VOID)
// {
PUSH {r0,lr} // Save LR (and dummy r0 to maintain stack alignment)
#if (defined(TX_ENABLE_EXECUTION_CHANGE_NOTIFY) || defined(TX_EXECUTION_PROFILE_ENABLE))
BL _tx_execution_isr_enter // Call the ISR enter function
#endif
BL _tx_timer_interrupt
#if (defined(TX_ENABLE_EXECUTION_CHANGE_NOTIFY) || defined(TX_EXECUTION_PROFILE_ENABLE))
BL _tx_execution_isr_exit // Call the ISR exit function
#endif
POP {r0,lr}
BX lr
// }
.section .text
.balign 4
.syntax unified
.eabi_attribute Tag_ABI_align_preserved, 1
.global __tx_NMIHandler
.thumb_func
.type __tx_NMIHandler, function
__tx_NMIHandler:
B __tx_NMIHandler
.section .text
.balign 4
.syntax unified
.eabi_attribute Tag_ABI_align_preserved, 1
.global __tx_DBGHandler
.thumb_func
.type __tx_DBGHandler, function
__tx_DBGHandler:
B __tx_DBGHandler
.end