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 /** USBX Component */
17 /** */
18 /** Storage Class */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23
24 /* Include necessary system files. */
25
26 #define UX_SOURCE_CODE
27
28 #include "ux_api.h"
29 #include "ux_host_class_storage.h"
30 #include "ux_host_stack.h"
31
32
33 /**************************************************************************/
34 /* */
35 /* FUNCTION RELEASE */
36 /* */
37 /* _ux_host_class_storage_partition_read PORTABLE C */
38 /* 6.1.2 */
39 /* AUTHOR */
40 /* */
41 /* Chaoqiong Xiao, Microsoft Corporation */
42 /* */
43 /* DESCRIPTION */
44 /* */
45 /* This function will analyze the partition table and parse all the */
46 /* partitions. It may happen that a partition entry points to a */
47 /* secondary partition table. */
48 /* */
49 /* INPUT */
50 /* */
51 /* storage Pointer to storage class */
52 /* sector_memory Pointer to memory for sector */
53 /* sector Sector number */
54 /* */
55 /* OUTPUT */
56 /* */
57 /* Completion Status */
58 /* */
59 /* CALLS */
60 /* */
61 /* _ux_host_class_storage_media_mount Mount media */
62 /* _ux_host_class_storage_media_open Open media */
63 /* _ux_utility_long_get Get 32-bit word */
64 /* */
65 /* CALLED BY */
66 /* */
67 /* _ux_host_class_storage_media_mount Mount media */
68 /* */
69 /* RELEASE HISTORY */
70 /* */
71 /* DATE NAME DESCRIPTION */
72 /* */
73 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
74 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
75 /* added option to disable FX */
76 /* media integration, */
77 /* resulting in version 6.1 */
78 /* 11-09-2020 Chaoqiong Xiao Modified comment(s), */
79 /* added exFAT support, */
80 /* resulting in version 6.1.2 */
81 /* */
82 /**************************************************************************/
_ux_host_class_storage_partition_read(UX_HOST_CLASS_STORAGE * storage,UCHAR * sector_memory,ULONG sector)83 UINT _ux_host_class_storage_partition_read(UX_HOST_CLASS_STORAGE *storage, UCHAR *sector_memory, ULONG sector)
84 {
85 #if defined(UX_HOST_CLASS_STORAGE_NO_FILEX)
86 UX_PARAMETER_NOT_USED(storage);
87 UX_PARAMETER_NOT_USED(sector_memory);
88 UX_PARAMETER_NOT_USED(sector);
89 return(UX_FUNCTION_NOT_SUPPORTED);
90 #else
91 UINT status = UX_ERROR;
92 UINT partition_index;
93
94
95 /* Point the sector buffer to the first partition entry. */
96 sector_memory += UX_HOST_CLASS_STORAGE_PARTITION_TABLE_START;
97
98 /* There are 4 partitions in a partition table. */
99 for (partition_index = 0; partition_index < 4; partition_index++)
100 {
101
102 /* Check if we recognize this partition entry. */
103 switch(*(sector_memory + UX_HOST_CLASS_STORAGE_PARTITION_TYPE))
104 {
105
106 case UX_HOST_CLASS_STORAGE_PARTITION_FAT_12:
107 case UX_HOST_CLASS_STORAGE_PARTITION_FAT_16:
108 case UX_HOST_CLASS_STORAGE_PARTITION_FAT_16L:
109 case UX_HOST_CLASS_STORAGE_PARTITION_FAT_16_LBA_MAPPED:
110 case UX_HOST_CLASS_STORAGE_PARTITION_FAT_32_1:
111 case UX_HOST_CLASS_STORAGE_PARTITION_FAT_32_2:
112 case UX_HOST_CLASS_STORAGE_PARTITION_EXFAT:
113
114 /* We have found a legal partition entry pointing to a potential boot sector. */
115 status = _ux_host_class_storage_media_open(storage, sector + _ux_utility_long_get(sector_memory + UX_HOST_CLASS_STORAGE_PARTITION_SECTORS_BEFORE));
116 break;
117
118 case UX_HOST_CLASS_STORAGE_PARTITION_EXTENDED:
119 case UX_HOST_CLASS_STORAGE_PARTITION_EXTENDED_LBA_MAPPED:
120
121 /* We have found an entry to an extended partition. We need to read that partition sector
122 and recursively mount all partitions found. */
123 status = _ux_host_class_storage_media_mount(storage, sector + _ux_utility_long_get(sector_memory + UX_HOST_CLASS_STORAGE_PARTITION_SECTORS_BEFORE));
124 break;
125
126 default:
127
128 /* We have found something which is not a DOS recognized partition, or an empty entry.
129 Ignore it and proceed with the rest. */
130 break;
131 }
132
133 /* Move to the next partition entry. */
134 sector_memory += UX_HOST_CLASS_STORAGE_PARTITION_TABLE_SIZE;
135 }
136
137 /* Return completion status. */
138 return(status);
139 #endif
140 }
141
142
