aboutsummaryrefslogtreecommitdiff
path: root/bl1/bl1_main.c
blob: fce14f55f0f53d67392bf3c27ddfcb9f53c82dcf (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
/*
 * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>

#include <platform_def.h>

#include <arch.h>
#include <arch_helpers.h>
#include <bl1/bl1.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <drivers/auth/auth_mod.h>
#include <drivers/console.h>
#include <lib/cpus/errata_report.h>
#include <lib/utils.h>
#include <plat/common/platform.h>
#include <smccc_helpers.h>
#include <tools_share/uuid.h>

#include "bl1_private.h"

/* BL1 Service UUID */
DEFINE_SVC_UUID2(bl1_svc_uid,
	0xd46739fd, 0xcb72, 0x9a4d, 0xb5, 0x75,
	0x67, 0x15, 0xd6, 0xf4, 0xbb, 0x4a);

static void bl1_load_bl2(void);

/*******************************************************************************
 * Helper utility to calculate the BL2 memory layout taking into consideration
 * the BL1 RW data assuming that it is at the top of the memory layout.
 ******************************************************************************/
void bl1_calc_bl2_mem_layout(const meminfo_t *bl1_mem_layout,
			meminfo_t *bl2_mem_layout)
{
	assert(bl1_mem_layout != NULL);
	assert(bl2_mem_layout != NULL);

	/*
	 * Remove BL1 RW data from the scope of memory visible to BL2.
	 * This is assuming BL1 RW data is at the top of bl1_mem_layout.
	 */
	assert(BL1_RW_BASE > bl1_mem_layout->total_base);
	bl2_mem_layout->total_base = bl1_mem_layout->total_base;
	bl2_mem_layout->total_size = BL1_RW_BASE - bl1_mem_layout->total_base;

	flush_dcache_range((unsigned long)bl2_mem_layout, sizeof(meminfo_t));
}

/*******************************************************************************
 * Setup function for BL1.
 ******************************************************************************/
void bl1_setup(void)
{
	/* Perform early platform-specific setup */
	bl1_early_platform_setup();

#ifdef AARCH64
	/*
	 * Update pointer authentication key before the MMU is enabled. It is
	 * saved in the rodata section, that can be writen before enabling the
	 * MMU. This function must be called after the console is initialized
	 * in the early platform setup.
	 */
	bl_handle_pauth();
#endif /* AARCH64 */

	/* Perform late platform-specific setup */
	bl1_plat_arch_setup();
}

/*******************************************************************************
 * Function to perform late architectural and platform specific initialization.
 * It also queries the platform to load and run next BL image. Only called
 * by the primary cpu after a cold boot.
 ******************************************************************************/
void bl1_main(void)
{
	unsigned int image_id;

	/* Announce our arrival */
	NOTICE(FIRMWARE_WELCOME_STR);
	NOTICE("BL1: %s\n", version_string);
	NOTICE("BL1: %s\n", build_message);

	INFO("BL1: RAM %p - %p\n", (void *)BL1_RAM_BASE,
					(void *)BL1_RAM_LIMIT);

	print_errata_status();

#if ENABLE_ASSERTIONS
	u_register_t val;
	/*
	 * Ensure that MMU/Caches and coherency are turned on
	 */
#ifdef AARCH32
	val = read_sctlr();
#else
	val = read_sctlr_el3();
#endif
	assert(val & SCTLR_M_BIT);
	assert(val & SCTLR_C_BIT);
	assert(val & SCTLR_I_BIT);
	/*
	 * Check that Cache Writeback Granule (CWG) in CTR_EL0 matches the
	 * provided platform value
	 */
	val = (read_ctr_el0() >> CTR_CWG_SHIFT) & CTR_CWG_MASK;
	/*
	 * If CWG is zero, then no CWG information is available but we can
	 * at least check the platform value is less than the architectural
	 * maximum.
	 */
	if (val != 0)
		assert(CACHE_WRITEBACK_GRANULE == SIZE_FROM_LOG2_WORDS(val));
	else
		assert(CACHE_WRITEBACK_GRANULE <= MAX_CACHE_LINE_SIZE);
#endif /* ENABLE_ASSERTIONS */

	/* Perform remaining generic architectural setup from EL3 */
	bl1_arch_setup();

#if TRUSTED_BOARD_BOOT
	/* Initialize authentication module */
	auth_mod_init();
#endif /* TRUSTED_BOARD_BOOT */

	/* Perform platform setup in BL1. */
	bl1_platform_setup();

	/* Get the image id of next image to load and run. */
	image_id = bl1_plat_get_next_image_id();

	/*
	 * We currently interpret any image id other than
	 * BL2_IMAGE_ID as the start of firmware update.
	 */
	if (image_id == BL2_IMAGE_ID)
		bl1_load_bl2();
	else
		NOTICE("BL1-FWU: *******FWU Process Started*******\n");

	bl1_prepare_next_image(image_id);

	console_flush();
}

/*******************************************************************************
 * This function locates and loads the BL2 raw binary image in the trusted SRAM.
 * Called by the primary cpu after a cold boot.
 * TODO: Add support for alternative image load mechanism e.g using virtio/elf
 * loader etc.
 ******************************************************************************/
static void bl1_load_bl2(void)
{
	image_desc_t *image_desc;
	image_info_t *image_info;
	int err;

	/* Get the image descriptor */
	image_desc = bl1_plat_get_image_desc(BL2_IMAGE_ID);
	assert(image_desc);

	/* Get the image info */
	image_info = &image_desc->image_info;
	INFO("BL1: Loading BL2\n");

	err = bl1_plat_handle_pre_image_load(BL2_IMAGE_ID);
	if (err) {
		ERROR("Failure in pre image load handling of BL2 (%d)\n", err);
		plat_error_handler(err);
	}

	err = load_auth_image(BL2_IMAGE_ID, image_info);
	if (err) {
		ERROR("Failed to load BL2 firmware.\n");
		plat_error_handler(err);
	}

	/* Allow platform to handle image information. */
	err = bl1_plat_handle_post_image_load(BL2_IMAGE_ID);
	if (err) {
		ERROR("Failure in post image load handling of BL2 (%d)\n", err);
		plat_error_handler(err);
	}

	NOTICE("BL1: Booting BL2\n");
}

/*******************************************************************************
 * Function called just before handing over to the next BL to inform the user
 * about the boot progress. In debug mode, also print details about the BL
 * image's execution context.
 ******************************************************************************/
void bl1_print_next_bl_ep_info(const entry_point_info_t *bl_ep_info)
{
#ifdef AARCH32
	NOTICE("BL1: Booting BL32\n");
#else
	NOTICE("BL1: Booting BL31\n");
#endif /* AARCH32 */
	print_entry_point_info(bl_ep_info);
}

#if SPIN_ON_BL1_EXIT
void print_debug_loop_message(void)
{
	NOTICE("BL1: Debug loop, spinning forever\n");
	NOTICE("BL1: Please connect the debugger to continue\n");
}
#endif

/*******************************************************************************
 * Top level handler for servicing BL1 SMCs.
 ******************************************************************************/
register_t bl1_smc_handler(unsigned int smc_fid,
	register_t x1,
	register_t x2,
	register_t x3,
	register_t x4,
	void *cookie,
	void *handle,
	unsigned int flags)
{

#if TRUSTED_BOARD_BOOT
	/*
	 * Dispatch FWU calls to FWU SMC handler and return its return
	 * value
	 */
	if (is_fwu_fid(smc_fid)) {
		return bl1_fwu_smc_handler(smc_fid, x1, x2, x3, x4, cookie,
			handle, flags);
	}
#endif

	switch (smc_fid) {
	case BL1_SMC_CALL_COUNT:
		SMC_RET1(handle, BL1_NUM_SMC_CALLS);

	case BL1_SMC_UID:
		SMC_UUID_RET(handle, bl1_svc_uid);

	case BL1_SMC_VERSION:
		SMC_RET1(handle, BL1_SMC_MAJOR_VER | BL1_SMC_MINOR_VER);

	default:
		break;
	}

	WARN("Unimplemented BL1 SMC Call: 0x%x \n", smc_fid);
	SMC_RET1(handle, SMC_UNK);
}

/*******************************************************************************
 * BL1 SMC wrapper.  This function is only used in AArch32 mode to ensure ABI
 * compliance when invoking bl1_smc_handler.
 ******************************************************************************/
register_t bl1_smc_wrapper(uint32_t smc_fid,
	void *cookie,
	void *handle,
	unsigned int flags)
{
	register_t x1, x2, x3, x4;

	assert(handle);

	get_smc_params_from_ctx(handle, x1, x2, x3, x4);
	return bl1_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle, flags);
}