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1 | /* |
1 | /* |
2 | * Copyright (c) 2006 Jakub Jermar |
2 | * Copyright (c) 2006 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <ofw_tree.h> |
29 | #include <ofw_tree.h> |
30 | #include <ofw.h> |
30 | #include <ofw.h> |
31 | #include <types.h> |
31 | #include <types.h> |
32 | #include <string.h> |
32 | #include <string.h> |
33 | #include <balloc.h> |
33 | #include <balloc.h> |
34 | #include <asm.h> |
34 | #include <asm.h> |
35 | 35 | ||
36 | #define MAX_PATH_LEN 256 |
36 | #define MAX_PATH_LEN 256 |
37 | 37 | ||
38 | static ofw_tree_node_t *ofw_tree_node_alloc(void) |
38 | static ofw_tree_node_t *ofw_tree_node_alloc(void) |
39 | { |
39 | { |
40 | return balloc(sizeof(ofw_tree_node_t), sizeof(ofw_tree_node_t)); |
40 | return balloc(sizeof(ofw_tree_node_t), sizeof(ofw_tree_node_t)); |
41 | } |
41 | } |
42 | 42 | ||
43 | static ofw_tree_property_t *ofw_tree_properties_alloc(unsigned count) |
43 | static ofw_tree_property_t *ofw_tree_properties_alloc(unsigned count) |
44 | { |
44 | { |
45 | return balloc(count * sizeof(ofw_tree_property_t), sizeof(ofw_tree_property_t)); |
45 | return balloc(count * sizeof(ofw_tree_property_t), |
- | 46 | sizeof(ofw_tree_property_t)); |
|
46 | } |
47 | } |
47 | 48 | ||
48 | static void * ofw_tree_space_alloc(size_t size) |
49 | static void *ofw_tree_space_alloc(size_t size) |
49 | { |
50 | { |
50 | char *addr; |
51 | char *addr; |
51 | 52 | ||
52 | /* |
53 | /* |
53 | * What we do here is a nasty hack :-) |
54 | * What we do here is a nasty hack :-) |
54 | * Problem: string property values that are allocated via this |
55 | * Problem: string property values that are allocated via this |
55 | * function typically do not contain the trailing '\0'. This |
56 | * function typically do not contain the trailing '\0'. This |
56 | * is very uncomfortable for kernel, which is supposed to deal |
57 | * is very uncomfortable for kernel, which is supposed to deal |
57 | * with the properties. |
58 | * with the properties. |
58 | * Solution: when allocating space via this function, we always |
59 | * Solution: when allocating space via this function, we always |
59 | * allocate space for the extra '\0' character that we store |
60 | * allocate space for the extra '\0' character that we store |
60 | * behind the requested memory. |
61 | * behind the requested memory. |
61 | */ |
62 | */ |
62 | addr = balloc(size + 1, size); |
63 | addr = balloc(size + 1, size); |
63 | if (addr) |
64 | if (addr) |
64 | addr[size] = '\0'; |
65 | addr[size] = '\0'; |
65 | return addr; |
66 | return addr; |
66 | } |
67 | } |
67 | 68 | ||
68 | /** Transfer information from one OpenFirmware node into its memory representation. |
69 | /** Transfer information from one OpenFirmware node into its memory |
- | 70 | * representation. |
|
69 | * |
71 | * |
70 | * Transfer entire information from the OpenFirmware device tree 'current' node to |
72 | * Transfer entire information from the OpenFirmware device tree 'current' node |
71 | * its memory representation in 'current_node'. This function recursively processes |
73 | * to its memory representation in 'current_node'. This function recursively |
72 | * all node's children. Node's peers are processed iteratively in order to prevent |
74 | * processes all node's children. Node's peers are processed iteratively in |
73 | * stack from overflowing. |
75 | * order to prevent stack from overflowing. |
74 | * |
76 | * |
75 | * @param current_node Pointer to uninitialized ofw_tree_node structure that will |
77 | * @param current_node Pointer to uninitialized ofw_tree_node structure that |
76 | * become the memory represenation of 'current'. |
78 | * will become the memory represenation of 'current'. |
77 | * @param parent_node Parent ofw_tree_node structure or NULL in case of root node. |
79 | * @param parent_node Parent ofw_tree_node structure or NULL in case of root |
- | 80 | * node. |
|
78 | * @param current OpenFirmware phandle to the current device tree node. |
81 | * @param current OpenFirmware phandle to the current device tree node. |
79 | */ |
82 | */ |
80 | static void ofw_tree_node_process(ofw_tree_node_t *current_node, |
83 | static void ofw_tree_node_process(ofw_tree_node_t *current_node, |
81 | ofw_tree_node_t *parent_node, phandle current) |
84 | ofw_tree_node_t *parent_node, phandle current) |
82 | { |
85 | { |
83 | static char path[MAX_PATH_LEN+1]; |
86 | static char path[MAX_PATH_LEN + 1]; |
84 | static char name[OFW_TREE_PROPERTY_MAX_NAMELEN]; |
87 | static char name[OFW_TREE_PROPERTY_MAX_NAMELEN]; |
- | 88 | static char name2[OFW_TREE_PROPERTY_MAX_NAMELEN]; |
|
85 | phandle peer; |
89 | phandle peer; |
86 | phandle child; |
90 | phandle child; |
87 | size_t len; |
91 | size_t len; |
88 | int i; |
92 | int i; |
89 | 93 | ||
90 | while (current_node) { |
94 | while (current_node) { |
91 | /* |
95 | /* |
92 | * Initialize node. |
96 | * Initialize node. |
93 | */ |
97 | */ |
94 | current_node->parent = parent_node; |
98 | current_node->parent = parent_node; |
95 | current_node->peer = NULL; |
99 | current_node->peer = NULL; |
96 | current_node->child = NULL; |
100 | current_node->child = NULL; |
97 | current_node->node_handle = current; |
101 | current_node->node_handle = current; |
98 | current_node->properties = 0; |
102 | current_node->properties = 0; |
99 | current_node->property = NULL; |
103 | current_node->property = NULL; |
100 | current_node->device = NULL; |
104 | current_node->device = NULL; |
101 | 105 | ||
102 | /* |
106 | /* |
103 | * Get the disambigued name. |
107 | * Get the disambigued name. |
104 | */ |
108 | */ |
105 | len = ofw_package_to_path(current, path, MAX_PATH_LEN); |
109 | len = ofw_package_to_path(current, path, MAX_PATH_LEN); |
106 | if (len == -1) |
110 | if (len == -1) |
107 | return; |
111 | return; |
108 | 112 | ||
109 | path[len] = '\0'; |
113 | path[len] = '\0'; |
110 | for (i = len - 1; i >= 0 && path[i] != '/'; i--) |
114 | for (i = len - 1; i >= 0 && path[i] != '/'; i--) |
111 | ; |
115 | ; |
112 | i++; /* do not include '/' */ |
116 | i++; /* do not include '/' */ |
113 | 117 | ||
114 | len -= i; |
118 | len -= i; |
115 | 119 | ||
116 | /* add space for trailing '\0' */ |
120 | /* add space for trailing '\0' */ |
117 | current_node->da_name = ofw_tree_space_alloc(len + 1); |
121 | current_node->da_name = ofw_tree_space_alloc(len + 1); |
118 | if (!current_node->da_name) |
122 | if (!current_node->da_name) |
119 | return; |
123 | return; |
120 | 124 | ||
121 | memcpy(current_node->da_name, &path[i], len); |
125 | memcpy(current_node->da_name, &path[i], len); |
122 | current_node->da_name[len] = '\0'; |
126 | current_node->da_name[len] = '\0'; |
123 | 127 | ||
124 | - | ||
125 | /* |
128 | /* |
126 | * Recursively process the potential child node. |
129 | * Recursively process the potential child node. |
127 | */ |
130 | */ |
128 | child = ofw_get_child_node(current); |
131 | child = ofw_get_child_node(current); |
129 | if (child != 0 && child != -1) { |
132 | if (child != 0 && child != -1) { |
130 | ofw_tree_node_t *child_node; |
133 | ofw_tree_node_t *child_node; |
131 | 134 | ||
132 | child_node = ofw_tree_node_alloc(); |
135 | child_node = ofw_tree_node_alloc(); |
133 | if (child_node) { |
136 | if (child_node) { |
134 | ofw_tree_node_process(child_node, current_node, child); |
137 | ofw_tree_node_process(child_node, current_node, |
- | 138 | child); |
|
135 | current_node->child = child_node; |
139 | current_node->child = child_node; |
136 | } |
140 | } |
137 | } |
141 | } |
138 | 142 | ||
139 | /* |
143 | /* |
140 | * Count properties. |
144 | * Count properties. |
141 | */ |
145 | */ |
142 | name[0] = '\0'; |
146 | name[0] = '\0'; |
143 | while (ofw_next_property(current, name, name) == 1) |
147 | while (ofw_next_property(current, name, name2) == 1) { |
144 | current_node->properties++; |
148 | current_node->properties++; |
- | 149 | memcpy(name, name2, OFW_TREE_PROPERTY_MAX_NAMELEN); |
|
- | 150 | } |
|
145 | 151 | ||
146 | if (!current_node->properties) |
152 | if (!current_node->properties) |
147 | return; |
153 | return; |
148 | 154 | ||
149 | /* |
155 | /* |
150 | * Copy properties. |
156 | * Copy properties. |
151 | */ |
157 | */ |
- | 158 | current_node->property = |
|
152 | current_node->property = ofw_tree_properties_alloc(current_node->properties); |
159 | ofw_tree_properties_alloc(current_node->properties); |
153 | if (!current_node->property) |
160 | if (!current_node->property) |
154 | return; |
161 | return; |
155 | 162 | ||
156 | name[0] = '\0'; |
163 | name[0] = '\0'; |
157 | for (i = 0; ofw_next_property(current, name, name) == 1; i++) { |
164 | for (i = 0; ofw_next_property(current, name, name2) == 1; i++) { |
158 | size_t size; |
165 | size_t size; |
159 | 166 | ||
160 | if (i == current_node->properties) |
167 | if (i == current_node->properties) |
161 | break; |
168 | break; |
162 | 169 | ||
- | 170 | memcpy(name, name2, OFW_TREE_PROPERTY_MAX_NAMELEN); |
|
163 | memcpy(current_node->property[i].name, name, |
171 | memcpy(current_node->property[i].name, name, |
164 | OFW_TREE_PROPERTY_MAX_NAMELEN); |
172 | OFW_TREE_PROPERTY_MAX_NAMELEN); |
- | 173 | current_node->property[i].name[ |
|
165 | current_node->property[i].name[OFW_TREE_PROPERTY_MAX_NAMELEN] = '\0'; |
174 | OFW_TREE_PROPERTY_MAX_NAMELEN] = '\0'; |
166 | 175 | ||
167 | size = ofw_get_proplen(current, name); |
176 | size = ofw_get_proplen(current, name); |
168 | current_node->property[i].size = size; |
177 | current_node->property[i].size = size; |
169 | if (size) { |
178 | if (size) { |
170 | void *buf; |
179 | void *buf; |
171 | 180 | ||
172 | buf = ofw_tree_space_alloc(size); |
181 | buf = ofw_tree_space_alloc(size); |
173 | if (current_node->property[i].value = buf) { |
182 | if (current_node->property[i].value = buf) { |
174 | /* |
183 | /* |
175 | * Copy property value to memory node. |
184 | * Copy property value to memory node. |
176 | */ |
185 | */ |
177 | (void) ofw_get_property(current, name, buf, size); |
186 | (void) ofw_get_property(current, name, |
- | 187 | buf, size); |
|
178 | } |
188 | } |
179 | } else { |
189 | } else { |
180 | current_node->property[i].value = NULL; |
190 | current_node->property[i].value = NULL; |
181 | } |
191 | } |
182 | } |
192 | } |
183 | 193 | ||
184 | current_node->properties = i; /* Just in case we ran out of memory. */ |
194 | /* Just in case we ran out of memory. */ |
- | 195 | current_node->properties = i; |
|
185 | 196 | ||
186 | /* |
197 | /* |
187 | * Iteratively process the next peer node. |
198 | * Iteratively process the next peer node. |
188 | * Note that recursion is a bad idea here. |
199 | * Note that recursion is a bad idea here. |
189 | * Due to the topology of the OpenFirmware device tree, |
200 | * Due to the topology of the OpenFirmware device tree, |
190 | * the nesting of peer nodes could be to wide and the |
201 | * the nesting of peer nodes could be to wide and the |
191 | * risk of overflowing the stack is too real. |
202 | * risk of overflowing the stack is too real. |
192 | */ |
203 | */ |
193 | peer = ofw_get_peer_node(current); |
204 | peer = ofw_get_peer_node(current); |
194 | if (peer != 0 && peer != -1) { |
205 | if (peer != 0 && peer != -1) { |
195 | ofw_tree_node_t *peer_node; |
206 | ofw_tree_node_t *peer_node; |
196 | 207 | ||
197 | peer_node = ofw_tree_node_alloc(); |
208 | peer_node = ofw_tree_node_alloc(); |
198 | if (peer_node) { |
209 | if (peer_node) { |
199 | current_node->peer = peer_node; |
210 | current_node->peer = peer_node; |
200 | current_node = peer_node; |
211 | current_node = peer_node; |
201 | current = peer; |
212 | current = peer; |
202 | /* |
213 | /* |
203 | * Process the peer in next iteration. |
214 | * Process the peer in next iteration. |
204 | */ |
215 | */ |
205 | continue; |
216 | continue; |
206 | } |
217 | } |
207 | } |
218 | } |
208 | /* |
219 | /* |
209 | * No more peers on this level. |
220 | * No more peers on this level. |
210 | */ |
221 | */ |
211 | break; |
222 | break; |
212 | } |
223 | } |
213 | } |
224 | } |
214 | 225 | ||
215 | /** Construct memory representation of OpenFirmware device tree. |
226 | /** Construct memory representation of OpenFirmware device tree. |
216 | * |
227 | * |
217 | * @return NULL on failure or pointer to the root node. |
228 | * @return NULL on failure or pointer to the root node. |
218 | */ |
229 | */ |
219 | ofw_tree_node_t *ofw_tree_build(void) |
230 | ofw_tree_node_t *ofw_tree_build(void) |
220 | { |
231 | { |
221 | ofw_tree_node_t *root; |
232 | ofw_tree_node_t *root; |
- | 233 | phandle ssm_node; |
|
- | 234 | ofw_tree_node_t *ssm; |
|
222 | 235 | ||
223 | root = ofw_tree_node_alloc(); |
236 | root = ofw_tree_node_alloc(); |
224 | if (root) |
237 | if (root) |
225 | ofw_tree_node_process(root, NULL, ofw_root); |
238 | ofw_tree_node_process(root, NULL, ofw_root); |
- | 239 | ||
- | 240 | /* |
|
- | 241 | * The firmware client interface does not automatically include the |
|
- | 242 | * "ssm" node in the list of children of "/". A nasty yet working |
|
- | 243 | * solution is to explicitly stick "ssm" to the OFW tree. |
|
- | 244 | */ |
|
- | 245 | ssm_node = ofw_find_device("/ssm@0,0"); |
|
- | 246 | if (ssm_node != -1) { |
|
- | 247 | ssm = ofw_tree_node_alloc(); |
|
- | 248 | if (ssm) { |
|
- | 249 | ofw_tree_node_process(ssm, root, |
|
- | 250 | ofw_find_device("/ssm@0,0")); |
|
- | 251 | ssm->peer = root->child; |
|
- | 252 | root->child = ssm; |
|
- | 253 | } |
|
- | 254 | } |
|
226 | 255 | ||
227 | return root; |
256 | return root; |
228 | } |
257 | } |
229 | 258 |