1/* 2 * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7#include <arch.h> 8#include <asm_macros.S> 9#include <common/bl_common.h> 10#include <el3_common_macros.S> 11 12 .globl bl2_entrypoint 13 .globl bl2_vector_table 14 .globl bl2_el3_run_image 15 .globl bl2_run_next_image 16 17func bl2_entrypoint 18 /* Save arguments x0-x3 from previous Boot loader */ 19 mov x20, x0 20 mov x21, x1 21 mov x22, x2 22 mov x23, x3 23 24 el3_entrypoint_common \ 25 _init_sctlr=1 \ 26 _warm_boot_mailbox=!PROGRAMMABLE_RESET_ADDRESS \ 27 _secondary_cold_boot=!COLD_BOOT_SINGLE_CPU \ 28 _init_memory=1 \ 29 _init_c_runtime=1 \ 30 _exception_vectors=bl2_el3_exceptions 31 32 /* --------------------------------------------- 33 * Restore parameters of boot rom 34 * --------------------------------------------- 35 */ 36 mov x0, x20 37 mov x1, x21 38 mov x2, x22 39 mov x3, x23 40 41 /* --------------------------------------------- 42 * Perform BL2 setup 43 * --------------------------------------------- 44 */ 45 bl bl2_el3_setup 46 47 /* --------------------------------------------- 48 * Enable pointer authentication 49 * --------------------------------------------- 50 */ 51#if ENABLE_PAUTH 52 mrs x0, sctlr_el3 53 orr x0, x0, #SCTLR_EnIA_BIT 54 msr sctlr_el3, x0 55 isb 56#endif /* ENABLE_PAUTH */ 57 58 /* --------------------------------------------- 59 * Jump to main function. 60 * --------------------------------------------- 61 */ 62 bl bl2_main 63 64 /* --------------------------------------------- 65 * Should never reach this point. 66 * --------------------------------------------- 67 */ 68 no_ret plat_panic_handler 69endfunc bl2_entrypoint 70 71func bl2_run_next_image 72 mov x20,x0 73 /* --------------------------------------------- 74 * MMU needs to be disabled because both BL2 and BL31 execute 75 * in EL3, and therefore share the same address space. 76 * BL31 will initialize the address space according to its 77 * own requirement. 78 * --------------------------------------------- 79 */ 80 bl disable_mmu_icache_el3 81 tlbi alle3 82 bl bl2_el3_plat_prepare_exit 83 84 /* --------------------------------------------- 85 * Disable pointer authentication before jumping to BL31 or that will 86 * cause an authentication failure during the early platform init. 87 * --------------------------------------------- 88 */ 89#if ENABLE_PAUTH 90 mrs x0, sctlr_el3 91 bic x0, x0, #SCTLR_EnIA_BIT 92 msr sctlr_el3, x0 93 isb 94#endif /* ENABLE_PAUTH */ 95 96 ldp x0, x1, [x20, #ENTRY_POINT_INFO_PC_OFFSET] 97 msr elr_el3, x0 98 msr spsr_el3, x1 99 100 ldp x6, x7, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x30)] 101 ldp x4, x5, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x20)] 102 ldp x2, x3, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x10)] 103 ldp x0, x1, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x0)] 104 eret 105endfunc bl2_run_next_image 106