1 /*
2 * Copyright (c) 2015-2024, Arm Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8 #include <stdint.h>
9
10 #include <platform_def.h>
11
12 #include <arch.h>
13 #include <arch_helpers.h>
14 #include <bl1/bl1.h>
15 #include <bl2u/bl2u.h>
16 #include <common/bl_common.h>
17 #include <common/build_message.h>
18 #include <common/debug.h>
19 #include <drivers/auth/auth_mod.h>
20 #include <drivers/console.h>
21 #include <plat/common/platform.h>
22
23 /*******************************************************************************
24 * This function is responsible to:
25 * Load SCP_BL2U if platform has defined SCP_BL2U_BASE
26 * Perform platform setup.
27 * Go back to EL3.
28 ******************************************************************************/
bl2u_main(void)29 void bl2u_main(void)
30 {
31 NOTICE("BL2U: %s\n", build_version_string);
32 NOTICE("BL2U: %s\n", build_message);
33
34 #if SCP_BL2U_BASE
35 int rc;
36 /* Load the subsequent bootloader images */
37 rc = bl2u_plat_handle_scp_bl2u();
38 if (rc != 0) {
39 ERROR("Failed to load SCP_BL2U (%i)\n", rc);
40 panic();
41 }
42 #endif
43
44 /* Perform platform setup in BL2U after loading SCP_BL2U */
45 bl2u_platform_setup();
46
47 console_flush();
48
49 #ifndef __aarch64__
50 /*
51 * For AArch32 state BL1 and BL2U share the MMU setup.
52 * Given that BL2U does not map BL1 regions, MMU needs
53 * to be disabled in order to go back to BL1.
54 */
55 disable_mmu_icache_secure();
56 #endif /* !__aarch64__ */
57
58 /*
59 * Indicate that BL2U is done and resume back to
60 * normal world via an SMC to BL1.
61 * x1 could be passed to Normal world,
62 * so DO NOT pass any secret information.
63 */
64 smc(FWU_SMC_SEC_IMAGE_DONE, 0, 0, 0, 0, 0, 0, 0);
65 wfi();
66 }
67