aboutsummaryrefslogtreecommitdiff
path: root/plat/rpi/rpi3/rpi3_bl31_setup.c
blob: 59157536b5ec14d1e1497a3ff09525c1b7ba1b3b (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
/*
 * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>

#include <libfdt.h>

#include <platform_def.h>

#include <common/bl_common.h>
#include <lib/xlat_tables/xlat_mmu_helpers.h>
#include <lib/xlat_tables/xlat_tables_defs.h>
#include <plat/common/platform.h>

#include <rpi_shared.h>

/*
 * Placeholder variables for copying the arguments that have been passed to
 * BL31 from BL2.
 */
static entry_point_info_t bl32_image_ep_info;
static entry_point_info_t bl33_image_ep_info;

/*******************************************************************************
 * Return a pointer to the 'entry_point_info' structure of the next image for
 * the security state specified. BL33 corresponds to the non-secure image type
 * while BL32 corresponds to the secure image type. A NULL pointer is returned
 * if the image does not exist.
 ******************************************************************************/
entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
{
	entry_point_info_t *next_image_info;

	assert(sec_state_is_valid(type) != 0);

	next_image_info = (type == NON_SECURE)
			? &bl33_image_ep_info : &bl32_image_ep_info;

	/* None of the images can have 0x0 as the entrypoint. */
	if (next_image_info->pc) {
		return next_image_info;
	} else {
		return NULL;
	}
}

/*******************************************************************************
 * Return entrypoint of BL33.
 ******************************************************************************/
uintptr_t plat_get_ns_image_entrypoint(void)
{
#ifdef PRELOADED_BL33_BASE
	return PRELOADED_BL33_BASE;
#else
	return PLAT_RPI3_NS_IMAGE_OFFSET;
#endif
}

/*******************************************************************************
 * Perform any BL31 early platform setup. Here is an opportunity to copy
 * parameters passed by the calling EL (S-EL1 in BL2 & EL3 in BL1) before
 * they are lost (potentially). This needs to be done before the MMU is
 * initialized so that the memory layout can be used while creating page
 * tables. BL2 has flushed this information to memory, so we are guaranteed
 * to pick up good data.
 ******************************************************************************/
void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
				u_register_t arg2, u_register_t arg3)

{
	/* Initialize the console to provide early debug support */
	rpi3_console_init();

	/*
	 * In debug builds, a special value is passed in 'arg1' to verify
	 * platform parameters from BL2 to BL31. Not used in release builds.
	 */
	assert(arg1 == RPI3_BL31_PLAT_PARAM_VAL);

	/* Check that params passed from BL2 are not NULL. */
	bl_params_t *params_from_bl2 = (bl_params_t *) arg0;

	assert(params_from_bl2 != NULL);
	assert(params_from_bl2->h.type == PARAM_BL_PARAMS);
	assert(params_from_bl2->h.version >= VERSION_2);

	bl_params_node_t *bl_params = params_from_bl2->head;

	/*
	 * Copy BL33 and BL32 (if present), entry point information.
	 * They are stored in Secure RAM, in BL2's address space.
	 */
	while (bl_params) {
		if (bl_params->image_id == BL32_IMAGE_ID) {
			bl32_image_ep_info = *bl_params->ep_info;
		}

		if (bl_params->image_id == BL33_IMAGE_ID) {
			bl33_image_ep_info = *bl_params->ep_info;
		}

		bl_params = bl_params->next_params_info;
	}

	if (bl33_image_ep_info.pc == 0) {
		panic();
	}

#if RPI3_DIRECT_LINUX_BOOT
# if RPI3_BL33_IN_AARCH32
	/*
	 * According to the file ``Documentation/arm/Booting`` of the Linux
	 * kernel tree, Linux expects:
	 * r0 = 0
	 * r1 = machine type number, optional in DT-only platforms (~0 if so)
	 * r2 = Physical address of the device tree blob
	 */
	VERBOSE("rpi3: Preparing to boot 32-bit Linux kernel\n");
	bl33_image_ep_info.args.arg0 = 0U;
	bl33_image_ep_info.args.arg1 = ~0U;
	bl33_image_ep_info.args.arg2 = (u_register_t) RPI3_PRELOADED_DTB_BASE;
# else
	/*
	 * According to the file ``Documentation/arm64/booting.txt`` of the
	 * Linux kernel tree, Linux expects the physical address of the device
	 * tree blob (DTB) in x0, while x1-x3 are reserved for future use and
	 * must be 0.
	 */
	VERBOSE("rpi3: Preparing to boot 64-bit Linux kernel\n");
	bl33_image_ep_info.args.arg0 = (u_register_t) RPI3_PRELOADED_DTB_BASE;
	bl33_image_ep_info.args.arg1 = 0ULL;
	bl33_image_ep_info.args.arg2 = 0ULL;
	bl33_image_ep_info.args.arg3 = 0ULL;
# endif /* RPI3_BL33_IN_AARCH32 */
#endif /* RPI3_DIRECT_LINUX_BOOT */
}

void bl31_plat_arch_setup(void)
{
	rpi3_setup_page_tables(BL31_BASE, BL31_END - BL31_BASE,
			       BL_CODE_BASE, BL_CODE_END,
			       BL_RO_DATA_BASE, BL_RO_DATA_END
#if USE_COHERENT_MEM
			       , BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_END
#endif
			      );

	enable_mmu_el3(0);
}

#ifdef RPI3_PRELOADED_DTB_BASE
/*
 * Add information to the device tree (if any) about the reserved DRAM used by
 * the Trusted Firmware.
 */
static void rpi3_dtb_add_mem_rsv(void)
{
	int i, regions, rc;
	uint64_t addr, size;
	void *dtb = (void *)RPI3_PRELOADED_DTB_BASE;

	INFO("rpi3: Checking DTB...\n");

	/* Return if no device tree is detected */
	if (fdt_check_header(dtb) != 0)
		return;

	regions = fdt_num_mem_rsv(dtb);

	VERBOSE("rpi3: Found %d mem reserve region(s)\n", regions);

	/* We expect to find one reserved region that we can modify */
	if (regions < 1)
		return;

	/*
	 * Look for the region that corresponds to the default boot firmware. It
	 * starts at address 0, and it is not needed when the default firmware
	 * is replaced by this port of the Trusted Firmware.
	 */
	for (i = 0; i < regions; i++) {
		if (fdt_get_mem_rsv(dtb, i, &addr, &size) != 0)
			continue;

		if (addr != 0x0)
			continue;

		VERBOSE("rpi3: Firmware mem reserve region found\n");

		rc = fdt_del_mem_rsv(dtb, i);
		if (rc != 0) {
			INFO("rpi3: Can't remove mem reserve region (%d)\n", rc);
		}

		break;
	}

	if (i == regions) {
		VERBOSE("rpi3: Firmware mem reserve region not found\n");
	}

	/*
	 * Reserve all SRAM. As said in the documentation, this isn't actually
	 * secure memory, so it is needed to tell BL33 that this is a reserved
	 * memory region. It doesn't guarantee it won't use it, though.
	 */
	rc = fdt_add_mem_rsv(dtb, SEC_SRAM_BASE, SEC_SRAM_SIZE);
	if (rc != 0) {
		WARN("rpi3: Can't add mem reserve region (%d)\n", rc);
	}

	INFO("rpi3: Reserved 0x%llx - 0x%llx in DTB\n", SEC_SRAM_BASE,
	     SEC_SRAM_BASE + SEC_SRAM_SIZE);
}
#endif

void bl31_platform_setup(void)
{
#ifdef RPI3_PRELOADED_DTB_BASE
	/* Only modify a DTB if we know where to look for it */
	rpi3_dtb_add_mem_rsv();
#endif
}