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 /** Module Manager */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23 #define TX_SOURCE_CODE
24
25 #include "tx_api.h"
26 #include "txm_module.h"
27
28 /**************************************************************************/
29 /* */
30 /* FUNCTION RELEASE */
31 /* */
32 /* _txm_module_manager_setup_mpu_registers RXv2/IAR */
33 /* 6.1.9 */
34 /* AUTHOR */
35 /* */
36 /* Scott Larson, Microsoft Corporation */
37 /* */
38 /* DESCRIPTION */
39 /* */
40 /* This function sets up the RX MPU register definitions based */
41 /* on the module's memory characteristics. */
42 /* */
43 /* INPUT */
44 /* */
45 /* module_instance Pointer to module instance */
46 /* */
47 /* OUTPUT */
48 /* */
49 /* MPU specifications for module */
50 /* */
51 /* CALLS */
52 /* */
53 /* none */
54 /* */
55 /* CALLED BY */
56 /* */
57 /* _txm_module_manager_thread_create */
58 /* */
59 /* RELEASE HISTORY */
60 /* */
61 /* DATE NAME DESCRIPTION */
62 /* */
63 /* 10-15-2021 Scott Larson Initial Version 6.1.9 */
64 /* */
65 /**************************************************************************/
_txm_module_manager_setup_mpu_registers(TXM_MODULE_INSTANCE * module_instance)66 VOID _txm_module_manager_setup_mpu_registers(TXM_MODULE_INSTANCE *module_instance)
67 {
68
69 ULONG region_size;
70 ULONG region_start_page_register;
71 ULONG region_end_page_register;
72
73 /* Setup region 0 for the ThreadX trampoline code. */
74 region_start_page_register = (ULONG) _txm_module_manager_user_mode_entry;
75 region_start_page_register = region_start_page_register & 0xFFFFFFF0;
76 module_instance -> txm_module_instance_mpu_registers[0] = region_start_page_register;
77 /* Region 0 End page is 2 pages away (for a total of 3 pages).
78 * Set reading permitted, writing prohibited, execution permitted, enable region. */
79 module_instance -> txm_module_instance_mpu_registers[1] = (region_start_page_register + 0x20) | 0x0B;
80
81 /* Place the trampoline protection in the MPU registers */
82 RSPAGE0 = module_instance -> txm_module_instance_mpu_registers[0];
83 REPAGE0 = module_instance -> txm_module_instance_mpu_registers[1];
84
85 /* Setup region 1 for code area. */
86 /* Set reading permitted, writing prohibited, execution permitted, enable region. */
87 region_start_page_register = (ULONG) module_instance -> txm_module_instance_code_start;
88 region_size = (ULONG) module_instance -> txm_module_instance_code_size;
89
90 region_end_page_register = (region_start_page_register + region_size - 1) & 0xFFFFFFF0;
91 region_start_page_register = region_start_page_register & 0xFFFFFFF0;
92
93 module_instance -> txm_module_instance_mpu_registers[2] = region_start_page_register;
94 module_instance -> txm_module_instance_mpu_registers[3] = region_end_page_register | 0x0B;
95
96 /* Setup region 2 for data area. */
97 /* Set reading permitted, writing permitted, execution prohibited, enable region. */
98 region_start_page_register = (ULONG) module_instance -> txm_module_instance_data_start;
99 region_size = (ULONG) module_instance -> txm_module_instance_data_size;
100
101 region_end_page_register = (region_start_page_register + region_size - 1) & 0xFFFFFFF0;
102 region_start_page_register = region_start_page_register & 0xFFFFFFF0;
103
104 module_instance -> txm_module_instance_mpu_registers[4] = region_start_page_register;
105 module_instance -> txm_module_instance_mpu_registers[5] = region_end_page_register | 0x0D;
106
107 }
108
