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 50 /* --------------------------------------------- 51 * This is BL2 which is expected to be executed 52 * only by the primary cpu (at least for now). 53 * So, make sure no secondary has lost its way. 54 * --------------------------------------------- 55 */ 56 mrs x0, mpidr_el1 57 bl platform_is_primary_cpu 58 cbz x0, _panic 59 60 /* --------------------------------------------- 61 * Set the exception vector to something sane. 62 * --------------------------------------------- 63 */ 64 adr x0, early_exceptions 65 msr vbar_el1, x0 66 67 /* --------------------------------------------- 68 * Enable the instruction cache. 69 * --------------------------------------------- 70 */ 71 mrs x0, sctlr_el1 72 orr x0, x0, #SCTLR_I_BIT 73 msr sctlr_el1, x0 74 isb 75 76 /* --------------------------------------------- 77 * Check the opcodes out of paranoia. 78 * --------------------------------------------- 79 */ 80 mov x0, #RUN_IMAGE 81 cmp x0, x20 82 b.ne _panic 83 84 /* --------------------------------------------- 85 * Zero out NOBITS sections. There are 2 of them: 86 * - the .bss section; 87 * - the coherent memory section. 88 * --------------------------------------------- 89 */ 90 ldr x0, =__BSS_START__ 91 ldr x1, =__BSS_SIZE__ 92 bl zeromem16 93 94 ldr x0, =__COHERENT_RAM_START__ 95 ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__ 96 bl zeromem16 97 98 /* -------------------------------------------- 99 * Allocate a stack whose memory will be marked 100 * as Normal-IS-WBWA when the MMU is enabled. 101 * There is no risk of reading stale stack 102 * memory after enabling the MMU as only the 103 * primary cpu is running at the moment. 104 * -------------------------------------------- 105 */ 106 mrs x0, mpidr_el1 107 bl platform_set_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 bl bl2_early_platform_setup 116 bl bl2_plat_arch_setup 117 118 /* --------------------------------------------- 119 * Jump to main function. 120 * --------------------------------------------- 121 */ 122 bl bl2_main 123_panic: 124 b _panic 125