1 /*
2 * Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8
9 #include <arch_helpers.h>
10 #include <arch_features.h>
11 #include <bl1/bl1.h>
12 #include <bl2/bl2.h>
13 #include <common/bl_common.h>
14 #include <common/debug.h>
15 #include <drivers/auth/auth_mod.h>
16 #include <drivers/console.h>
17 #if MEASURED_BOOT
18 #include <drivers/measured_boot/measured_boot.h>
19 #endif
20 #include <lib/extensions/pauth.h>
21 #include <plat/common/platform.h>
22
23 #include "bl2_private.h"
24
25 #ifdef __aarch64__
26 #define NEXT_IMAGE "BL31"
27 #else
28 #define NEXT_IMAGE "BL32"
29 #endif
30
31 #if !BL2_AT_EL3
32 /*******************************************************************************
33 * Setup function for BL2.
34 ******************************************************************************/
bl2_setup(u_register_t arg0,u_register_t arg1,u_register_t arg2,u_register_t arg3)35 void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2,
36 u_register_t arg3)
37 {
38 /* Perform early platform-specific setup */
39 bl2_early_platform_setup2(arg0, arg1, arg2, arg3);
40
41 /* Perform late platform-specific setup */
42 bl2_plat_arch_setup();
43
44 #if CTX_INCLUDE_PAUTH_REGS
45 /*
46 * Assert that the ARMv8.3-PAuth registers are present or an access
47 * fault will be triggered when they are being saved or restored.
48 */
49 assert(is_armv8_3_pauth_present());
50 #endif /* CTX_INCLUDE_PAUTH_REGS */
51 }
52
53 #else /* if BL2_AT_EL3 */
54 /*******************************************************************************
55 * Setup function for BL2 when BL2_AT_EL3=1.
56 ******************************************************************************/
bl2_el3_setup(u_register_t arg0,u_register_t arg1,u_register_t arg2,u_register_t arg3)57 void bl2_el3_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2,
58 u_register_t arg3)
59 {
60 /* Perform early platform-specific setup */
61 bl2_el3_early_platform_setup(arg0, arg1, arg2, arg3);
62
63 /* Perform late platform-specific setup */
64 bl2_el3_plat_arch_setup();
65
66 #if CTX_INCLUDE_PAUTH_REGS
67 /*
68 * Assert that the ARMv8.3-PAuth registers are present or an access
69 * fault will be triggered when they are being saved or restored.
70 */
71 assert(is_armv8_3_pauth_present());
72 #endif /* CTX_INCLUDE_PAUTH_REGS */
73 }
74 #endif /* BL2_AT_EL3 */
75
76 /*******************************************************************************
77 * The only thing to do in BL2 is to load further images and pass control to
78 * next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2
79 * runs entirely in S-EL1.
80 ******************************************************************************/
bl2_main(void)81 void bl2_main(void)
82 {
83 entry_point_info_t *next_bl_ep_info;
84
85 NOTICE("BL2: %s\n", version_string);
86 NOTICE("BL2: %s\n", build_message);
87
88 /* Perform remaining generic architectural setup in S-EL1 */
89 bl2_arch_setup();
90
91 #if TRUSTED_BOARD_BOOT
92 /* Initialize authentication module */
93 auth_mod_init();
94
95 #if MEASURED_BOOT
96 /* Initialize measured boot module */
97 measured_boot_init();
98
99 #endif /* MEASURED_BOOT */
100 #endif /* TRUSTED_BOARD_BOOT */
101
102 /* Initialize boot source */
103 bl2_plat_preload_setup();
104
105 /* Load the subsequent bootloader images. */
106 next_bl_ep_info = bl2_load_images();
107
108 #if MEASURED_BOOT
109 /* Finalize measured boot */
110 measured_boot_finish();
111 #endif /* MEASURED_BOOT */
112
113 #if !BL2_AT_EL3
114 #ifndef __aarch64__
115 /*
116 * For AArch32 state BL1 and BL2 share the MMU setup.
117 * Given that BL2 does not map BL1 regions, MMU needs
118 * to be disabled in order to go back to BL1.
119 */
120 disable_mmu_icache_secure();
121 #endif /* !__aarch64__ */
122
123 console_flush();
124
125 #if ENABLE_PAUTH
126 /*
127 * Disable pointer authentication before running next boot image
128 */
129 pauth_disable_el1();
130 #endif /* ENABLE_PAUTH */
131
132 /*
133 * Run next BL image via an SMC to BL1. Information on how to pass
134 * control to the BL32 (if present) and BL33 software images will
135 * be passed to next BL image as an argument.
136 */
137 smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0);
138 #else /* if BL2_AT_EL3 */
139 NOTICE("BL2: Booting " NEXT_IMAGE "\n");
140 print_entry_point_info(next_bl_ep_info);
141 console_flush();
142
143 #if ENABLE_PAUTH
144 /*
145 * Disable pointer authentication before running next boot image
146 */
147 pauth_disable_el3();
148 #endif /* ENABLE_PAUTH */
149
150 bl2_run_next_image(next_bl_ep_info);
151 #endif /* BL2_AT_EL3 */
152 }
153