1 /*
2 * Copyright (c) 2015-2020, 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/debug.h>
18 #include <drivers/auth/auth_mod.h>
19 #include <drivers/console.h>
20 #include <plat/common/platform.h>
21
22 /*******************************************************************************
23 * This function is responsible to:
24 * Load SCP_BL2U if platform has defined SCP_BL2U_BASE
25 * Perform platform setup.
26 * Go back to EL3.
27 ******************************************************************************/
bl2u_main(void)28 void bl2u_main(void)
29 {
30 NOTICE("BL2U: %s\n", version_string);
31 NOTICE("BL2U: %s\n", build_message);
32
33 #if SCP_BL2U_BASE
34 int rc;
35 /* Load the subsequent bootloader images */
36 rc = bl2u_plat_handle_scp_bl2u();
37 if (rc != 0) {
38 ERROR("Failed to load SCP_BL2U (%i)\n", rc);
39 panic();
40 }
41 #endif
42
43 /* Perform platform setup in BL2U after loading SCP_BL2U */
44 bl2u_platform_setup();
45
46 console_flush();
47
48 #ifndef __aarch64__
49 /*
50 * For AArch32 state BL1 and BL2U share the MMU setup.
51 * Given that BL2U does not map BL1 regions, MMU needs
52 * to be disabled in order to go back to BL1.
53 */
54 disable_mmu_icache_secure();
55 #endif /* !__aarch64__ */
56
57 /*
58 * Indicate that BL2U is done and resume back to
59 * normal world via an SMC to BL1.
60 * x1 could be passed to Normal world,
61 * so DO NOT pass any secret information.
62 */
63 smc(FWU_SMC_SEC_IMAGE_DONE, 0, 0, 0, 0, 0, 0, 0);
64 wfi();
65 }
66