/* * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of ARM nor the names of its contributors may be used * to endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include .globl bl2_vector_table .globl bl2_entrypoint vector_base bl2_vector_table b bl2_entrypoint b report_exception /* Undef */ b report_exception /* SVC call */ b report_exception /* Prefetch abort */ b report_exception /* Data abort */ b report_exception /* Reserved */ b report_exception /* IRQ */ b report_exception /* FIQ */ func bl2_entrypoint /*--------------------------------------------- * Save from r1 the extents of the trusted ram * available to BL2 for future use. * r0 is not currently used. * --------------------------------------------- */ mov r11, r1 /* --------------------------------------------- * Set the exception vector to something sane. * --------------------------------------------- */ ldr r0, =bl2_vector_table stcopr r0, VBAR isb /* ----------------------------------------------------- * Enable the instruction cache * ----------------------------------------------------- */ ldcopr r0, SCTLR orr r0, r0, #SCTLR_I_BIT stcopr r0, SCTLR isb /* --------------------------------------------- * Since BL2 executes after BL1, it is assumed * here that BL1 has already has done the * necessary register initializations. * --------------------------------------------- */ /* --------------------------------------------- * Invalidate the RW memory used by the BL2 * image. This includes the data and NOBITS * sections. This is done to safeguard against * possible corruption of this memory by dirty * cache lines in a system cache as a result of * use by an earlier boot loader stage. * --------------------------------------------- */ ldr r0, =__RW_START__ ldr r1, =__RW_END__ sub r1, r1, r0 bl inv_dcache_range /* --------------------------------------------- * Zero out NOBITS sections. There are 2 of them: * - the .bss section; * - the coherent memory section. * --------------------------------------------- */ ldr r0, =__BSS_START__ ldr r1, =__BSS_SIZE__ bl zeromem #if USE_COHERENT_MEM ldr r0, =__COHERENT_RAM_START__ ldr r1, =__COHERENT_RAM_UNALIGNED_SIZE__ bl zeromem #endif /* -------------------------------------------- * Allocate a stack whose memory will be marked * as Normal-IS-WBWA when the MMU is enabled. * There is no risk of reading stale stack * memory after enabling the MMU as only the * primary cpu is running at the moment. * -------------------------------------------- */ bl plat_set_my_stack /* --------------------------------------------- * Perform early platform setup & platform * specific early arch. setup e.g. mmu setup * --------------------------------------------- */ mov r0, r11 bl bl2_early_platform_setup bl bl2_plat_arch_setup /* --------------------------------------------- * Jump to main function. * --------------------------------------------- */ bl bl2_main /* --------------------------------------------- * Should never reach this point. * --------------------------------------------- */ bl plat_panic_handler endfunc bl2_entrypoint