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 <bl_common.h> 32#include <arch.h> 33#include <asm_macros.S> 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 bl read_mpidr 58 mov x19, x0 59 bl platform_is_primary_cpu 60 cbz x0, _panic 61 62 /* --------------------------------------------- 63 * Set the exception vector to something sane. 64 * --------------------------------------------- 65 */ 66 adr x0, early_exceptions 67 msr vbar_el1, x0 68 69 /* --------------------------------------------- 70 * Enable the instruction cache. 71 * --------------------------------------------- 72 */ 73 mrs x0, sctlr_el1 74 orr x0, x0, #SCTLR_I_BIT 75 msr sctlr_el1, x0 76 77 isb 78 79 /* --------------------------------------------- 80 * Check the opcodes out of paranoia. 81 * --------------------------------------------- 82 */ 83 mov x0, #RUN_IMAGE 84 cmp x0, x20 85 b.ne _panic 86 87 /* --------------------------------------------- 88 * Zero out NOBITS sections. There are 2 of them: 89 * - the .bss section; 90 * - the coherent memory section. 91 * --------------------------------------------- 92 */ 93 ldr x0, =__BSS_START__ 94 ldr x1, =__BSS_SIZE__ 95 bl zeromem16 96 97 ldr x0, =__COHERENT_RAM_START__ 98 ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__ 99 bl zeromem16 100 101 /* -------------------------------------------- 102 * Give ourselves a small coherent stack to 103 * ease the pain of initializing the MMU 104 * -------------------------------------------- 105 */ 106 mov x0, x19 107 bl platform_set_coherent_stack 108 109 /* --------------------------------------------- 110 * Perform early platform setup & platform 111 * specific early arch. setup e.g. mmu setup 112 * --------------------------------------------- 113 */ 114 mov x0, x21 115 mov x1, x22 116 bl bl2_early_platform_setup 117 bl bl2_plat_arch_setup 118 119 /* --------------------------------------------- 120 * Give ourselves a stack allocated in Normal 121 * -IS-WBWA memory 122 * --------------------------------------------- 123 */ 124 mov x0, x19 125 bl platform_set_stack 126 127 /* --------------------------------------------- 128 * Jump to main function. 129 * --------------------------------------------- 130 */ 131 bl bl2_main 132_panic: 133 b _panic 134