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#include <bl_common.h> 34 35 36 .globl bl2_entrypoint 37 38 39 40func bl2_entrypoint 41 /*--------------------------------------------- 42 * Store the extents of the tzram available to 43 * BL2 for future use. Use the opcode param to 44 * allow implement other functions if needed. 45 * --------------------------------------------- 46 */ 47 mov x20, x0 48 mov x21, x1 49 mov x22, x2 50 51 /* --------------------------------------------- 52 * This is BL2 which is expected to be executed 53 * only by the primary cpu (at least for now). 54 * So, make sure no secondary has lost its way. 55 * --------------------------------------------- 56 */ 57 mrs x0, mpidr_el1 58 bl platform_is_primary_cpu 59 cbz x0, _panic 60 61 /* --------------------------------------------- 62 * Set the exception vector to something sane. 63 * --------------------------------------------- 64 */ 65 adr x0, early_exceptions 66 msr vbar_el1, x0 67 68 /* --------------------------------------------- 69 * Enable the instruction cache. 70 * --------------------------------------------- 71 */ 72 mrs x0, sctlr_el1 73 orr x0, x0, #SCTLR_I_BIT 74 msr sctlr_el1, x0 75 isb 76 77 /* --------------------------------------------- 78 * Check the opcodes out of paranoia. 79 * --------------------------------------------- 80 */ 81 mov x0, #RUN_IMAGE 82 cmp x0, x20 83 b.ne _panic 84 85 /* --------------------------------------------- 86 * Zero out NOBITS sections. There are 2 of them: 87 * - the .bss section; 88 * - the coherent memory section. 89 * --------------------------------------------- 90 */ 91 ldr x0, =__BSS_START__ 92 ldr x1, =__BSS_SIZE__ 93 bl zeromem16 94 95 ldr x0, =__COHERENT_RAM_START__ 96 ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__ 97 bl zeromem16 98 99 /* -------------------------------------------- 100 * Give ourselves a small coherent stack to 101 * ease the pain of initializing the MMU 102 * -------------------------------------------- 103 */ 104 mrs x0, mpidr_el1 105 bl platform_set_coherent_stack 106 107 /* --------------------------------------------- 108 * Perform early platform setup & platform 109 * specific early arch. setup e.g. mmu setup 110 * --------------------------------------------- 111 */ 112 mov x0, x21 113 mov x1, x22 114 bl bl2_early_platform_setup 115 bl bl2_plat_arch_setup 116 117 /* --------------------------------------------- 118 * Give ourselves a stack allocated in Normal 119 * -IS-WBWA memory 120 * --------------------------------------------- 121 */ 122 mrs x0, mpidr_el1 123 bl platform_set_stack 124 125 /* --------------------------------------------- 126 * Jump to main function. 127 * --------------------------------------------- 128 */ 129 bl bl2_main 130_panic: 131 b _panic 132