| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * arch/arm/cpu/armv8/rcar_gen3/lowlevel_init.S |
| * This file is lowlevel initialize routine. |
| * |
| * (C) Copyright 2015 Renesas Electronics Corporation |
| * |
| * This file is based on the arch/arm/cpu/armv8/start.S |
| * |
| * (C) Copyright 2013 |
| * David Feng <fenghua@phytium.com.cn> |
| */ |
| |
| #include <asm-offsets.h> |
| #include <config.h> |
| #include <linux/linkage.h> |
| #include <asm/macro.h> |
| |
| ENTRY(lowlevel_init) |
| mov x29, lr /* Save LR */ |
| |
| #ifndef CONFIG_ARMV8_MULTIENTRY |
| /* |
| * For single-entry systems the lowlevel init is very simple. |
| */ |
| ldr x0, =GICD_BASE |
| bl gic_init_secure |
| |
| #else /* CONFIG_ARMV8_MULTIENTRY is set */ |
| |
| #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3) |
| branch_if_slave x0, 1f |
| ldr x0, =GICD_BASE |
| bl gic_init_secure |
| 1: |
| #if defined(CONFIG_GICV3) |
| ldr x0, =GICR_BASE |
| bl gic_init_secure_percpu |
| #elif defined(CONFIG_GICV2) |
| ldr x0, =GICD_BASE |
| ldr x1, =GICC_BASE |
| bl gic_init_secure_percpu |
| #endif |
| #endif |
| |
| branch_if_master x0, x1, 2f |
| |
| /* |
| * Slave should wait for master clearing spin table. |
| * This sync prevent salves observing incorrect |
| * value of spin table and jumping to wrong place. |
| */ |
| #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3) |
| #ifdef CONFIG_GICV2 |
| ldr x0, =GICC_BASE |
| #endif |
| bl gic_wait_for_interrupt |
| #endif |
| |
| /* |
| * All slaves will enter EL2 and optionally EL1. |
| */ |
| adr x4, lowlevel_in_el2 |
| ldr x5, =ES_TO_AARCH64 |
| bl armv8_switch_to_el2 |
| |
| lowlevel_in_el2: |
| #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 |
| adr x4, lowlevel_in_el1 |
| ldr x5, =ES_TO_AARCH64 |
| bl armv8_switch_to_el1 |
| |
| lowlevel_in_el1: |
| #endif |
| #endif /* CONFIG_ARMV8_MULTIENTRY */ |
| |
| bl s_init |
| |
| 2: |
| mov lr, x29 /* Restore LR */ |
| ret |
| ENDPROC(lowlevel_init) |
