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Diffstat (limited to 'bl2/aarch64/bl2_entrypoint.S')
| -rw-r--r-- | bl2/aarch64/bl2_entrypoint.S | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/bl2/aarch64/bl2_entrypoint.S b/bl2/aarch64/bl2_entrypoint.S new file mode 100644 index 0000000..5adc71b --- /dev/null +++ b/bl2/aarch64/bl2_entrypoint.S @@ -0,0 +1,129 @@ +/* + * Copyright (c) 2013-2014, 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> +#include <platform_def.h> + + .globl bl2_entrypoint + +func bl2_entrypoint + /*--------------------------------------------- + * Store the extents of the tzram available to + * BL2 for future use. Use the opcode param to + * allow implement other functions if needed. + * --------------------------------------------- + */ + mov x20, x0 + mov x21, x1 + + /* --------------------------------------------- + * This is BL2 which is expected to be executed + * only by the primary cpu (at least for now). + * So, make sure no secondary has lost its way. + * --------------------------------------------- + */ + mrs x0, mpidr_el1 + bl platform_is_primary_cpu + cbz x0, _panic + + /* --------------------------------------------- + * Set the exception vector to something sane. + * --------------------------------------------- + */ + adr x0, early_exceptions + msr vbar_el1, x0 + + /* --------------------------------------------- + * Enable the instruction cache. + * --------------------------------------------- + */ + mrs x0, sctlr_el1 + orr x0, x0, #SCTLR_I_BIT + msr sctlr_el1, x0 + isb + + /* --------------------------------------------- + * Check the opcodes out of paranoia. + * --------------------------------------------- + */ + // mov x0, #RUN_IMAGE + // cmp x0, x20 + // b.ne _panic + + + + /* --------------------------------------------- + * 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 zeromem16 + + ldr x0, =__COHERENT_RAM_START__ + ldr x1, =__COHERENT_RAM_UNALIGNED_SIZE__ + bl zeromem16 + + /* -------------------------------------------- + * Give ourselves a small coherent stack to + * ease the pain of initializing the MMU + * -------------------------------------------- + */ + mrs x0, mpidr_el1 + bl platform_set_coherent_stack + + /* --------------------------------------------- + * Perform early platform setup & platform + * specific early arch. setup e.g. mmu setup + * --------------------------------------------- + */ + mov x0, x21 + bl bl2_early_platform_setup + bl bl2_plat_arch_setup + + /* --------------------------------------------- + * Give ourselves a stack allocated in Normal + * -IS-WBWA memory + * --------------------------------------------- + */ + mrs x0, mpidr_el1 + bl platform_set_stack + + /* --------------------------------------------- + * Jump to main function. + * --------------------------------------------- + */ + bl bl2_main +_panic: + b _panic |