| /* |
| * Copyright (c) 2013-2017, 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 <arch.h> |
| #include <asm_macros.S> |
| #include <bl_common.h> |
| |
| |
| .globl bl2_entrypoint |
| |
| |
| |
| func bl2_entrypoint |
| /*--------------------------------------------- |
| * Save from x1 the extents of the tzram |
| * available to BL2 for future use. |
| * x0 is not currently used. |
| * --------------------------------------------- |
| */ |
| mov x20, x1 |
| |
| /* --------------------------------------------- |
| * Set the exception vector to something sane. |
| * --------------------------------------------- |
| */ |
| adr x0, early_exceptions |
| msr vbar_el1, x0 |
| isb |
| |
| /* --------------------------------------------- |
| * Enable the SError interrupt now that the |
| * exception vectors have been setup. |
| * --------------------------------------------- |
| */ |
| msr daifclr, #DAIF_ABT_BIT |
| |
| /* --------------------------------------------- |
| * Enable the instruction cache, stack pointer |
| * and data access alignment checks |
| * --------------------------------------------- |
| */ |
| mov x1, #(SCTLR_I_BIT | SCTLR_A_BIT | SCTLR_SA_BIT) |
| mrs x0, sctlr_el1 |
| orr x0, x0, x1 |
| msr sctlr_el1, x0 |
| isb |
| |
| /* --------------------------------------------- |
| * 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. |
| * --------------------------------------------- |
| */ |
| adr x0, __RW_START__ |
| adr x1, __RW_END__ |
| sub x1, x1, x0 |
| bl inv_dcache_range |
| |
| /* --------------------------------------------- |
| * Zero out NOBITS sections. There are 2 of them: |
| * - the .bss section; |
| * - the coherent memory section. |
| * --------------------------------------------- |
| */ |
| ldr x0, =__BSS_START__ |
| ldr x1, =__BSS_SIZE__ |
| bl zeromem |
| |
| #if USE_COHERENT_MEM |
| ldr x0, =__COHERENT_RAM_START__ |
| ldr x1, =__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 |
| |
| /* --------------------------------------------- |
| * 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 x0, x20 |
| bl bl2_early_platform_setup |
| bl bl2_plat_arch_setup |
| |
| /* --------------------------------------------- |
| * Jump to main function. |
| * --------------------------------------------- |
| */ |
| bl bl2_main |
| |
| /* --------------------------------------------- |
| * Should never reach this point. |
| * --------------------------------------------- |
| */ |
| no_ret plat_panic_handler |
| |
| endfunc bl2_entrypoint |