bl2/aarch64/bl2_el3_entrypoint.S

/*
 * Copyright (c) 2017-2019, 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>
#include <el3_common_macros.S>

	.globl	bl2_entrypoint
	.globl	bl2_el3_run_image
	.globl	bl2_run_next_image

func bl2_entrypoint
	/* Save arguments x0-x3 from previous Boot loader */
	mov	x20, x0
	mov	x21, x1
	mov	x22, x2
	mov	x23, x3

	el3_entrypoint_common                                   \
		_init_sctlr=1                                   \
		_warm_boot_mailbox=!PROGRAMMABLE_RESET_ADDRESS  \
		_secondary_cold_boot=!COLD_BOOT_SINGLE_CPU      \
		_init_memory=1                                  \
		_init_c_runtime=1                               \
		_exception_vectors=bl2_el3_exceptions

	/* ---------------------------------------------
	 * Restore parameters of boot rom
	 * ---------------------------------------------
	 */
	mov	x0, x20
	mov	x1, x21
	mov	x2, x22
	mov	x3, x23

	/* ---------------------------------------------
	 * Perform BL2 setup
	 * ---------------------------------------------
	 */
	bl	bl2_el3_setup

	/* ---------------------------------------------
	 * Enable pointer authentication
	 * ---------------------------------------------
	 */
#if ENABLE_PAUTH
	mrs	x0, sctlr_el3
	orr	x0, x0, #SCTLR_EnIA_BIT
#if ENABLE_BTI
	/* ---------------------------------------------
	 * Enable PAC branch type compatibility
	 * ---------------------------------------------
	 */
	bic	x0, x0, #SCTLR_BT_BIT
#endif	/* ENABLE_BTI */
	msr	sctlr_el3, x0
	isb
#endif /* ENABLE_PAUTH */

	/* ---------------------------------------------
	 * Jump to main function.
	 * ---------------------------------------------
	 */
	bl	bl2_main

	/* ---------------------------------------------
	 * Should never reach this point.
	 * ---------------------------------------------
	 */
	no_ret	plat_panic_handler
endfunc bl2_entrypoint

func bl2_run_next_image
	mov	x20,x0
	/* ---------------------------------------------
	 * MMU needs to be disabled because both BL2 and BL31 execute
	 * in EL3, and therefore share the same address space.
	 * BL31 will initialize the address space according to its
	 * own requirement.
	 * ---------------------------------------------
	 */
	bl	disable_mmu_icache_el3
	tlbi	alle3
	bl	bl2_el3_plat_prepare_exit

	/* ---------------------------------------------
	 * Disable pointer authentication before jumping to BL31 or that will
	 * cause an authentication failure during the early platform init.
	 * ---------------------------------------------
	 */
#if ENABLE_PAUTH
	mrs	x0, sctlr_el3
	bic	x0, x0, #SCTLR_EnIA_BIT
	msr	sctlr_el3, x0
	isb
#endif /* ENABLE_PAUTH */

	ldp	x0, x1, [x20, #ENTRY_POINT_INFO_PC_OFFSET]
	msr	elr_el3, x0
	msr	spsr_el3, x1

	ldp	x6, x7, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x30)]
	ldp	x4, x5, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x20)]
	ldp	x2, x3, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x10)]
	ldp	x0, x1, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x0)]
	eret
endfunc bl2_run_next_image