blob: c738677caa5f8f51f4280fe73401271bb3c3f803 [file] [log] [blame]
Achin Gupta4f6ad662013-10-25 09:08:21 +01001/*
Dan Handleyab2d31e2013-12-02 19:25:12 +00002 * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
Achin Gupta4f6ad662013-10-25 09:08:21 +01003 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * Redistributions of source code must retain the above copyright notice, this
8 * list of conditions and the following disclaimer.
9 *
10 * Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * Neither the name of ARM nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific
16 * prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <stdio.h>
32#include <string.h>
33#include <assert.h>
34#include <arch_helpers.h>
35#include <console.h>
36#include <platform.h>
37#include <semihosting.h>
38#include <bl_common.h>
39#include <bl2.h>
40
41/*******************************************************************************
42 * The only thing to do in BL2 is to load further images and pass control to
43 * BL31. The memory occupied by BL2 will be reclaimed by BL3_x stages. BL2 runs
44 * entirely in S-EL1. Since arm standard c libraries are not PIC, printf et al
45 * are not available. We rely on assertions to signal error conditions
46 ******************************************************************************/
47void bl2_main(void)
48{
49 meminfo bl2_tzram_layout, *bl31_tzram_layout;
50 el_change_info *ns_image_info;
51 unsigned long bl31_base, el_status;
52 unsigned int bl2_load, bl31_load, mode;
53
54 /* Perform remaining generic architectural setup in S-El1 */
55 bl2_arch_setup();
56
57 /* Perform platform setup in BL1 */
58 bl2_platform_setup();
59
60#if defined (__GNUC__)
61 printf("BL2 Built : %s, %s\n\r", __TIME__, __DATE__);
62#endif
63
64 /* Find out how much free trusted ram remains after BL2 load */
65 bl2_tzram_layout = bl2_get_sec_mem_layout();
66
67 /*
68 * Load BL31. BL1 tells BL2 whether it has been TOP or BOTTOM loaded.
69 * To avoid fragmentation of trusted SRAM memory, BL31 is always
70 * loaded opposite to BL2. This allows BL31 to reclaim BL2 memory
71 * while maintaining its free space in one contiguous chunk.
72 */
73 bl2_load = bl2_tzram_layout.attr & LOAD_MASK;
74 assert((bl2_load == TOP_LOAD) || (bl2_load == BOT_LOAD));
75 bl31_load = (bl2_load == TOP_LOAD) ? BOT_LOAD : TOP_LOAD;
76 bl31_base = load_image(&bl2_tzram_layout, BL31_IMAGE_NAME,
77 bl31_load, BL31_BASE);
78
79 /* Assert if it has not been possible to load BL31 */
80 assert(bl31_base != 0);
81
82 /*
83 * Create a new layout of memory for BL31 as seen by BL2. This
84 * will gobble up all the BL2 memory.
85 */
86 bl31_tzram_layout = (meminfo *) get_el_change_mem_ptr();
87 init_bl31_mem_layout(&bl2_tzram_layout, bl31_tzram_layout, bl31_load);
88
89 /*
90 * BL2 also needs to tell BL31 where the non-trusted software image
91 * has been loaded. Place this info right after the BL31 memory layout
92 */
93 ns_image_info = (el_change_info *) ((unsigned char *) bl31_tzram_layout
94 + sizeof(meminfo));
95
96 /*
97 * Assume that the non-secure bootloader has already been
98 * loaded to its platform-specific location.
99 */
100 ns_image_info->entrypoint = plat_get_ns_image_entrypoint();
101
102 /* Figure out what mode we enter the non-secure world in */
103 el_status = read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL2_SHIFT;
104 el_status &= ID_AA64PFR0_ELX_MASK;
105
106 if (el_status)
107 mode = MODE_EL2;
108 else
109 mode = MODE_EL1;
110
111 ns_image_info->spsr = make_spsr(mode, MODE_SP_ELX, MODE_RW_64);
112 ns_image_info->security_state = NON_SECURE;
113 flush_dcache_range((unsigned long) ns_image_info,
114 sizeof(el_change_info));
115
116 /*
117 * Run BL31 via an SMC to BL1. Information on how to pass control to
118 * the non-trusted software image will be passed to BL31 in x2.
119 */
120 if (bl31_base)
121 run_image(bl31_base,
122 make_spsr(MODE_EL3, MODE_SP_ELX, MODE_RW_64),
123 SECURE,
124 bl31_tzram_layout,
125 (void *) ns_image_info);
126
127 /* There is no valid reason for run_image() to return */
128 assert(0);
129}
130
131/*******************************************************************************
132 * BL1 has this function to print the fact that BL2 has done its job and BL31 is
133 * about to be loaded. Since BL2 re-uses BL1's exception table, it needs to
134 * define this function as well.
135 * TODO: Remove this function from BL2.
136 ******************************************************************************/
137void display_boot_progress(unsigned long entrypoint,
138 unsigned long spsr,
139 unsigned long mem_layout,
140 unsigned long ns_image_info)
141{
142 return;
143}