/* * Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include <arch.h> #include <asm_macros.S> #include <common/bl_common.h> .globl bl2u_vector_table .globl bl2u_entrypoint vector_base bl2u_vector_table b bl2u_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 bl2u_entrypoint /*--------------------------------------------- * Save from r1 the extents of the trusted ram * available to BL2U for future use. * r0 is not currently used. * --------------------------------------------- */ mov r11, r1 mov r10, r2 /* --------------------------------------------- * Set the exception vector to something sane. * --------------------------------------------- */ ldr r0, =bl2u_vector_table stcopr r0, VBAR isb /* -------------------------------------------------------- * Enable the instruction cache - disable speculative loads * -------------------------------------------------------- */ ldcopr r0, SCTLR orr r0, r0, #SCTLR_I_BIT bic r0, r0, #SCTLR_DSSBS_BIT stcopr r0, SCTLR isb /* --------------------------------------------- * Since BL2U executes after BL1, it is assumed * here that BL1 has already has done the * necessary register initializations. * --------------------------------------------- */ /* --------------------------------------------- * Invalidate the RW memory used by the BL2U * 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 /* -------------------------------------------- * 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 /* --------------------------------------------- * Initialize the stack protector canary before * any C code is called. * --------------------------------------------- */ #if STACK_PROTECTOR_ENABLED bl update_stack_protector_canary #endif /* --------------------------------------------- * Perform early platform setup & platform * specific early arch. setup e.g. mmu setup * --------------------------------------------- */ mov r0, r11 mov r1, r10 bl bl2u_early_platform_setup bl bl2u_plat_arch_setup /* --------------------------------------------- * Jump to main function. * --------------------------------------------- */ bl bl2u_main /* --------------------------------------------- * Should never reach this point. * --------------------------------------------- */ no_ret plat_panic_handler endfunc bl2u_entrypoint