1/* 2 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <arch.h> 32#include <asm_macros.S> 33 34 .globl bl1_entrypoint 35 36 37 /* ----------------------------------------------------- 38 * bl1_entrypoint() is the entry point into the trusted 39 * firmware code when a cpu is released from warm or 40 * cold reset. 41 * ----------------------------------------------------- 42 */ 43 44func bl1_entrypoint 45 /* --------------------------------------------- 46 * Set the CPU endianness before doing anything 47 * that might involve memory reads or writes 48 * --------------------------------------------- 49 */ 50 mrs x0, sctlr_el3 51 bic x0, x0, #SCTLR_EE_BIT 52 msr sctlr_el3, x0 53 isb 54 55 /* --------------------------------------------- 56 * Perform any processor specific actions upon 57 * reset e.g. cache, tlb invalidations etc. 58 * --------------------------------------------- 59 */ 60 bl cpu_reset_handler 61 62 /* --------------------------------------------- 63 * Set the exception vector to something sane. 64 * --------------------------------------------- 65 */ 66 adr x0, bl1_exceptions 67 msr vbar_el3, x0 68 69 /* --------------------------------------------------------------------- 70 * The initial state of the Architectural feature trap register 71 * (CPTR_EL3) is unknown and it must be set to a known state. All 72 * feature traps are disabled. Some bits in this register are marked as 73 * Reserved and should not be modified. 74 * 75 * CPTR_EL3.TCPAC: This causes a direct access to the CPACR_EL1 from EL1 76 * or the CPTR_EL2 from EL2 to trap to EL3 unless it is trapped at EL2. 77 * CPTR_EL3.TTA: This causes access to the Trace functionality to trap 78 * to EL3 when executed from EL0, EL1, EL2, or EL3. If system register 79 * access to trace functionality is not supported, this bit is RES0. 80 * CPTR_EL3.TFP: This causes instructions that access the registers 81 * associated with Floating Point and Advanced SIMD execution to trap 82 * to EL3 when executed from any exception level, unless trapped to EL1 83 * or EL2. 84 * --------------------------------------------------------------------- 85 */ 86 mrs x0, cptr_el3 87 bic w0, w0, #TCPAC_BIT 88 bic w0, w0, #TTA_BIT 89 bic w0, w0, #TFP_BIT 90 msr cptr_el3, x0 91 92 /* --------------------------------------------- 93 * Enable the instruction cache. 94 * --------------------------------------------- 95 */ 96 mrs x0, sctlr_el3 97 orr x0, x0, #SCTLR_I_BIT 98 msr sctlr_el3, x0 99 isb 100 101_wait_for_entrypoint: 102 /* --------------------------------------------- 103 * Find the type of reset and jump to handler 104 * if present. If the handler is null then it is 105 * a cold boot. The primary cpu will set up the 106 * platform while the secondaries wait for 107 * their turn to be woken up 108 * --------------------------------------------- 109 */ 110 mrs x0, mpidr_el1 111 bl platform_get_entrypoint 112 cbnz x0, _do_warm_boot 113 mrs x0, mpidr_el1 114 bl platform_is_primary_cpu 115 cbnz x0, _do_cold_boot 116 117 /* --------------------------------------------- 118 * Perform any platform specific secondary cpu 119 * actions 120 * --------------------------------------------- 121 */ 122 bl plat_secondary_cold_boot_setup 123 b _wait_for_entrypoint 124 125_do_cold_boot: 126 /* --------------------------------------------- 127 * Init C runtime environment. 128 * - Zero-initialise the NOBITS sections. 129 * There are 2 of them: 130 * - the .bss section; 131 * - the coherent memory section. 132 * - Copy the data section from BL1 image 133 * (stored in ROM) to the correct location 134 * in RAM. 135 * --------------------------------------------- 136 */ 137 ldr x0, =__BSS_START__ 138 ldr x1, =__BSS_SIZE__ 139 bl zeromem16 140 141 ldr x0, =__COHERENT_RAM_START__ 142 ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__ 143 bl zeromem16 144 145 ldr x0, =__DATA_RAM_START__ 146 ldr x1, =__DATA_ROM_START__ 147 ldr x2, =__DATA_SIZE__ 148 bl memcpy16 149 150 /* --------------------------------------------- 151 * Initialize platform and jump to our c-entry 152 * point for this type of reset 153 * --------------------------------------------- 154 */ 155 adr x0, bl1_main 156 bl platform_cold_boot_init 157 b _panic 158 159_do_warm_boot: 160 /* --------------------------------------------- 161 * Jump to BL31 for all warm boot init. 162 * --------------------------------------------- 163 */ 164 blr x0 165_panic: 166 b _panic 167