1/* 2 * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7#include <platform_def.h> 8 9#include <arch.h> 10#include <asm_macros.S> 11#include <common/bl_common.h> 12#include <el3_common_macros.S> 13 14 .globl bl2_entrypoint 15 .globl bl2_el3_run_image 16 .globl bl2_run_next_image 17 18#if BL2_IN_XIP_MEM 19#define FIXUP_SIZE 0 20#else 21#define FIXUP_SIZE ((BL2_LIMIT) - (BL2_BASE)) 22#endif 23 24func bl2_entrypoint 25 /* Save arguments x0-x3 from previous Boot loader */ 26 mov x20, x0 27 mov x21, x1 28 mov x22, x2 29 mov x23, x3 30 31 el3_entrypoint_common \ 32 _init_sctlr=1 \ 33 _warm_boot_mailbox=!PROGRAMMABLE_RESET_ADDRESS \ 34 _secondary_cold_boot=!COLD_BOOT_SINGLE_CPU \ 35 _init_memory=1 \ 36 _init_c_runtime=1 \ 37 _exception_vectors=bl2_el3_exceptions \ 38 _pie_fixup_size=FIXUP_SIZE 39 40 /* --------------------------------------------- 41 * Restore parameters of boot rom 42 * --------------------------------------------- 43 */ 44 mov x0, x20 45 mov x1, x21 46 mov x2, x22 47 mov x3, x23 48 49 /* --------------------------------------------- 50 * Perform BL2 setup 51 * --------------------------------------------- 52 */ 53 bl bl2_el3_setup 54 55#if ENABLE_PAUTH 56 /* --------------------------------------------- 57 * Program APIAKey_EL1 and enable pointer authentication. 58 * --------------------------------------------- 59 */ 60 bl pauth_init_enable_el3 61#endif /* ENABLE_PAUTH */ 62 63 /* --------------------------------------------- 64 * Jump to main function. 65 * --------------------------------------------- 66 */ 67 bl bl2_main 68 69 /* --------------------------------------------- 70 * Should never reach this point. 71 * --------------------------------------------- 72 */ 73 no_ret plat_panic_handler 74endfunc bl2_entrypoint 75 76func bl2_run_next_image 77 mov x20,x0 78 /* --------------------------------------------- 79 * MMU needs to be disabled because both BL2 and BL31 execute 80 * in EL3, and therefore share the same address space. 81 * BL31 will initialize the address space according to its 82 * own requirement. 83 * --------------------------------------------- 84 */ 85 bl disable_mmu_icache_el3 86 tlbi alle3 87 bl bl2_el3_plat_prepare_exit 88 89#if ENABLE_PAUTH 90 /* --------------------------------------------- 91 * Disable pointer authentication before jumping 92 * to next boot image. 93 * --------------------------------------------- 94 */ 95 bl pauth_disable_el3 96#endif /* ENABLE_PAUTH */ 97 98 ldp x0, x1, [x20, #ENTRY_POINT_INFO_PC_OFFSET] 99 msr elr_el3, x0 100 msr spsr_el3, x1 101 102 ldp x6, x7, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x30)] 103 ldp x4, x5, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x20)] 104 ldp x2, x3, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x10)] 105 ldp x0, x1, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x0)] 106 exception_return 107endfunc bl2_run_next_image 108