aboutsummaryrefslogtreecommitdiff
path: root/common/desc_image_load.c
blob: 30b97e05098163782970ee2d5f8a04f9068b968b (plain)
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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/*
 * Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>

#include <arch_helpers.h>
#include <common/bl_common.h>
#include <common/desc_image_load.h>
#include <common/tbbr/tbbr_img_def.h>

static bl_load_info_t bl_load_info;
static bl_params_t next_bl_params;


/*******************************************************************************
 * This function flushes the data structures so that they are visible
 * in memory for the next BL image.
 ******************************************************************************/
void flush_bl_params_desc(void)
{
	flush_bl_params_desc_args(bl_mem_params_desc_ptr,
		bl_mem_params_desc_num,
		&next_bl_params);
}

/*******************************************************************************
 * This function flushes the data structures specified as arguments so that they
 * are visible in memory for the next BL image.
 ******************************************************************************/
void flush_bl_params_desc_args(bl_mem_params_node_t *mem_params_desc_ptr,
	unsigned int mem_params_desc_num,
	bl_params_t *next_bl_params_ptr)
{
	assert(mem_params_desc_ptr != NULL);
	assert(mem_params_desc_num != 0U);
	assert(next_bl_params_ptr != NULL);

	flush_dcache_range((uintptr_t)mem_params_desc_ptr,
		sizeof(*mem_params_desc_ptr) * mem_params_desc_num);

	flush_dcache_range((uintptr_t)next_bl_params_ptr,
			sizeof(*next_bl_params_ptr));
}

/*******************************************************************************
 * This function returns the index for given image_id, within the
 * image descriptor array provided by bl_image_info_descs_ptr, if the
 * image is found else it returns -1.
 ******************************************************************************/
int get_bl_params_node_index(unsigned int image_id)
{
	unsigned int index;
	assert(image_id != INVALID_IMAGE_ID);

	for (index = 0U; index < bl_mem_params_desc_num; index++) {
		if (bl_mem_params_desc_ptr[index].image_id == image_id)
			return (int)index;
	}

	return -1;
}

/*******************************************************************************
 * This function returns the pointer to `bl_mem_params_node_t` object for
 * given image_id, within the image descriptor array provided by
 * bl_mem_params_desc_ptr, if the image is found else it returns NULL.
 ******************************************************************************/
bl_mem_params_node_t *get_bl_mem_params_node(unsigned int image_id)
{
	int index;
	assert(image_id != INVALID_IMAGE_ID);

	index = get_bl_params_node_index(image_id);
	if (index >= 0)
		return &bl_mem_params_desc_ptr[index];
	else
		return NULL;
}

/*******************************************************************************
 * This function creates the list of loadable images, by populating and
 * linking each `bl_load_info_node_t` type node, using the internal array
 * of image descriptor provided by bl_mem_params_desc_ptr. It also populates
 * and returns `bl_load_info_t` type structure that contains head of the list
 * of loadable images.
 ******************************************************************************/
bl_load_info_t *get_bl_load_info_from_mem_params_desc(void)
{
	unsigned int index = 0;

	/* If there is no image to start with, return NULL */
	if (bl_mem_params_desc_num == 0U)
		return NULL;

	/* Assign initial data structures */
	bl_load_info_node_t *bl_node_info =
		&bl_mem_params_desc_ptr[index].load_node_mem;
	bl_load_info.head = bl_node_info;
	SET_PARAM_HEAD(&bl_load_info, PARAM_BL_LOAD_INFO, VERSION_2, 0U);

	/* Go through the image descriptor array and create the list */
	for (; index < bl_mem_params_desc_num; index++) {

		/* Populate the image information */
		bl_node_info->image_id = bl_mem_params_desc_ptr[index].image_id;
		bl_node_info->image_info = &bl_mem_params_desc_ptr[index].image_info;

		/* Link next image if present */
		if ((index + 1U) < bl_mem_params_desc_num) {
			/* Get the memory and link the next node */
			bl_node_info->next_load_info =
				&bl_mem_params_desc_ptr[index + 1U].load_node_mem;
			bl_node_info = bl_node_info->next_load_info;
		}
	}

	return &bl_load_info;
}

/*******************************************************************************
 * This function creates the list of executable images, by populating and
 * linking each `bl_params_node_t` type node, using the internal array of
 * image descriptor provided by bl_mem_params_desc_ptr. It also populates
 * and returns `bl_params_t` type structure that contains head of the list
 * of executable images.
 ******************************************************************************/
bl_params_t *get_next_bl_params_from_mem_params_desc(void)
{
	unsigned int count;
	unsigned int img_id = 0U;
	unsigned int link_index = 0U;
	bl_params_node_t *bl_current_exec_node = NULL;
	bl_params_node_t *bl_last_exec_node = NULL;
	bl_mem_params_node_t *desc_ptr;

	/* If there is no image to start with, return NULL */
	if (bl_mem_params_desc_num == 0U)
		return NULL;

	/* Get the list HEAD */
	for (count = 0U; count < bl_mem_params_desc_num; count++) {

		desc_ptr = &bl_mem_params_desc_ptr[count];

		if ((EP_GET_EXE(desc_ptr->ep_info.h.attr) == EXECUTABLE) &&
			(EP_GET_FIRST_EXE(desc_ptr->ep_info.h.attr) == EP_FIRST_EXE)) {
			next_bl_params.head = &desc_ptr->params_node_mem;
			link_index = count;
			break;
		}
	}

	/* Make sure we have a HEAD node */
	assert(next_bl_params.head != NULL);

	/* Populate the HEAD information */
	SET_PARAM_HEAD(&next_bl_params, PARAM_BL_PARAMS, VERSION_2, 0U);

	/*
	 * Go through the image descriptor array and create the list.
	 * This bounded loop is to make sure that we are not looping forever.
	 */
	for (count = 0U; count < bl_mem_params_desc_num; count++) {

		desc_ptr = &bl_mem_params_desc_ptr[link_index];

		/* Make sure the image is executable */
		assert(EP_GET_EXE(desc_ptr->ep_info.h.attr) == EXECUTABLE);

		/* Get the memory for current node */
		bl_current_exec_node = &desc_ptr->params_node_mem;

		/* Populate the image information */
		bl_current_exec_node->image_id = desc_ptr->image_id;
		bl_current_exec_node->image_info = &desc_ptr->image_info;
		bl_current_exec_node->ep_info = &desc_ptr->ep_info;

		if (bl_last_exec_node != NULL) {
			/* Assert if loop detected */
			assert(bl_last_exec_node->next_params_info == NULL);

			/* Link the previous node to the current one */
			bl_last_exec_node->next_params_info = bl_current_exec_node;
		}

		/* Update the last node */
		bl_last_exec_node = bl_current_exec_node;

		/* If no next hand-off image then break out */
		img_id = desc_ptr->next_handoff_image_id;
		if (img_id == INVALID_IMAGE_ID)
			break;

		/* Get the index for the next hand-off image */
		link_index = get_bl_params_node_index(img_id);
		assert((link_index > 0U) &&
			(link_index < bl_mem_params_desc_num));
	}

	/* Invalid image is expected to terminate the loop */
	assert(img_id == INVALID_IMAGE_ID);

	return &next_bl_params;
}

/*******************************************************************************
 * This function populates the entry point information with the corresponding
 * config file for all executable BL images described in bl_params.
 ******************************************************************************/
void populate_next_bl_params_config(bl_params_t *bl2_to_next_bl_params)
{
	bl_params_node_t *params_node;
	unsigned int fw_config_id;
	uintptr_t fw_config_base;
	bl_mem_params_node_t *mem_params;
	uintptr_t hw_config_base = 0;

	assert(bl2_to_next_bl_params != NULL);

	/*
	 * Get the `bl_mem_params_node_t` corresponding to HW_CONFIG
	 * if available.
	 */
	mem_params = get_bl_mem_params_node(HW_CONFIG_ID);

	if (mem_params != NULL)
		hw_config_base = mem_params->image_info.image_base;

	for (params_node = bl2_to_next_bl_params->head; params_node != NULL;
			params_node = params_node->next_params_info) {

		fw_config_base = 0;

		switch (params_node->image_id) {
		case BL31_IMAGE_ID:
			fw_config_id = SOC_FW_CONFIG_ID;
			break;
		case BL32_IMAGE_ID:
		/*
		 * At the moment, OPTEE cannot accept a DTB in secure memory,
		 * so fall back and use NT_FW_CONFIG instead.
		 * This MUST be fixed as soon as OPTEE has support to
		 * receive DTBs in secure memory.
		 */
#ifndef SPD_opteed
			fw_config_id = TOS_FW_CONFIG_ID;
			break;
#endif
		case BL33_IMAGE_ID:
			fw_config_id = NT_FW_CONFIG_ID;
			break;
		default:
			fw_config_id = INVALID_IMAGE_ID;
			break;
		}

		if (fw_config_id != INVALID_IMAGE_ID) {
			mem_params = get_bl_mem_params_node(fw_config_id);
			if (mem_params != NULL) {
				fw_config_base = mem_params->image_info.image_base;
			}
		}

#ifdef SPD_opteed
		/*
		 * If SPD_opteed is enabled, arg[0,2] are populated by
		 * parse_optee_header(), which is called by
		 * arm_bl2_handle_post_image_load(). The meaning of the
		 * arguments are:
		 * arg0 <-- MODE_RW
		 * arg1 <-- Paged image base
		 * arg2 <-- Paged image size
		 */
		if (params_node->image_id == BL32_IMAGE_ID) {
			params_node->ep_info->args.arg3 = fw_config_base;
		} else {
#endif
			/*
			 * Pass hw and tb_fw config addresses to next images.
			 * NOTE - for EL3 runtime images (BL31 for AArch64
			 * and BL32 for AArch32), arg0 is already used by
			 * generic code. Take care of not overwriting the
			 * previous initialisations.
			 */
			if (params_node == bl2_to_next_bl_params->head) {
				if (params_node->ep_info->args.arg1 == 0U)
					params_node->ep_info->args.arg1 =
								fw_config_base;
				if (params_node->ep_info->args.arg2 == 0U)
					params_node->ep_info->args.arg2 =
								hw_config_base;
			} else {
				if (params_node->ep_info->args.arg0 == 0U)
					params_node->ep_info->args.arg0 =
								fw_config_base;
				if (params_node->ep_info->args.arg1 == 0U)
					params_node->ep_info->args.arg1 =
								hw_config_base;
			}
#ifdef SPD_opteed
		}
#endif
	}
}

/*******************************************************************************
 * Helper to extract BL32/BL33 entry point info from arg0 passed to BL31, for
 * platforms that are only interested in those. Platforms that need to extract
 * more information can parse the structures themselves.
 ******************************************************************************/

void bl31_params_parse_helper(u_register_t param,
			      entry_point_info_t *bl32_ep_info_out,
			      entry_point_info_t *bl33_ep_info_out)
{
	bl_params_node_t *node;
	bl_params_t *v2 = (void *)(uintptr_t)param;

#if !ERROR_DEPRECATED
	if (v2->h.version == PARAM_VERSION_1) {
		struct { /* Deprecated version 1 parameter structure. */
			param_header_t h;
			image_info_t *bl31_image_info;
			entry_point_info_t *bl32_ep_info;
			image_info_t *bl32_image_info;
			entry_point_info_t *bl33_ep_info;
			image_info_t *bl33_image_info;
		} *v1 = (void *)(uintptr_t)param;
		assert(v1->h.type == PARAM_BL31);
		if (bl32_ep_info_out != NULL)
			*bl32_ep_info_out = *v1->bl32_ep_info;
		if (bl33_ep_info_out != NULL)
			*bl33_ep_info_out = *v1->bl33_ep_info;
		return;
	}
#endif /* !ERROR_DEPRECATED */

	assert(v2->h.version == PARAM_VERSION_2);
	assert(v2->h.type == PARAM_BL_PARAMS);
	for (node = v2->head; node != NULL; node = node->next_params_info) {
		if (node->image_id == BL32_IMAGE_ID)
			if (bl32_ep_info_out != NULL)
				*bl32_ep_info_out = *node->ep_info;
		if (node->image_id == BL33_IMAGE_ID)
			if (bl33_ep_info_out != NULL)
				*bl33_ep_info_out = *node->ep_info;
	}
}