arch/arm/cpu/armv8/start.S - platform/external/u-boot - Gitiles

 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2013
  * David Feng <fenghua@phytium.com.cn>
  */

 #include <asm-offsets.h>
 #include <config.h>
 #include <linux/linkage.h>
 #include <asm/macro.h>
 #include <asm/armv8/mmu.h>

 /*************************************************************************
  *
  * Startup Code (reset vector)
  *
  *************************************************************************/

 .globl	_start
 _start:
 #if defined(CONFIG_LINUX_KERNEL_IMAGE_HEADER)
 #include <asm/boot0-linux-kernel-header.h>
 #elif defined(CONFIG_ENABLE_ARM_SOC_BOOT0_HOOK)
 /*
  * Various SoCs need something special and SoC-specific up front in
  * order to boot, allow them to set that in their boot0.h file and then
  * use it here.
  */
 #include <asm/arch/boot0.h>
 #else
 	b	reset
 #endif

 	.align 3

 .globl	_TEXT_BASE
 _TEXT_BASE:
 	.quad	CONFIG_SYS_TEXT_BASE

 /*
  * These are defined in the linker script.
  */
 .globl	_end_ofs
 _end_ofs:
 	.quad	_end - _start

 .globl	_bss_start_ofs
 _bss_start_ofs:
 	.quad	__bss_start - _start

 .globl	_bss_end_ofs
 _bss_end_ofs:
 	.quad	__bss_end - _start

 reset:
 	/* Allow the board to save important registers */
 	b	save_boot_params
 .globl	save_boot_params_ret
 save_boot_params_ret:

 #if CONFIG_POSITION_INDEPENDENT
 	/* Verify that we're 4K aligned.  */
 	adr	x0, _start
 	ands	x0, x0, #0xfff
 	b.eq	1f
 0:
 	/*
 	 * FATAL, can't continue.
 	 * U-Boot needs to be loaded at a 4K aligned address.
 	 *
 	 * We use ADRP and ADD to load some symbol addresses during startup.
 	 * The ADD uses an absolute (non pc-relative) lo12 relocation
 	 * thus requiring 4K alignment.
 	 */
 	wfi
 	b	0b
 1:

 	/*
 	 * Fix .rela.dyn relocations. This allows U-Boot to be loaded to and
 	 * executed at a different address than it was linked at.
 	 */
 pie_fixup:
 	adr	x0, _start		/* x0 <- Runtime value of _start */
 	ldr	x1, _TEXT_BASE		/* x1 <- Linked value of _start */
 	subs	x9, x0, x1		/* x9 <- Run-vs-link offset */
 	beq	pie_fixup_done
 	adrp    x2, __rel_dyn_start     /* x2 <- Runtime &__rel_dyn_start */
 	add     x2, x2, #:lo12:__rel_dyn_start
 	adrp    x3, __rel_dyn_end       /* x3 <- Runtime &__rel_dyn_end */
 	add     x3, x3, #:lo12:__rel_dyn_end
 pie_fix_loop:
 	ldp	x0, x1, [x2], #16	/* (x0, x1) <- (Link location, fixup) */
 	ldr	x4, [x2], #8		/* x4 <- addend */
 	cmp	w1, #1027		/* relative fixup? */
 	bne	pie_skip_reloc
 	/* relative fix: store addend plus offset at dest location */
 	add	x0, x0, x9
 	add	x4, x4, x9
 	str	x4, [x0]
 pie_skip_reloc:
 	cmp	x2, x3
 	b.lo	pie_fix_loop
 pie_fixup_done:
 #endif

 #ifdef CONFIG_SYS_RESET_SCTRL
 	bl reset_sctrl
 #endif

 #if defined(CONFIG_ARMV8_SPL_EXCEPTION_VECTORS) || !defined(CONFIG_SPL_BUILD)
 .macro	set_vbar, regname, reg
 	msr	\regname, \reg
 .endm
 	adr	x0, vectors
 #else
 .macro	set_vbar, regname, reg
 .endm
 #endif
 	/*
 	 * Could be EL3/EL2/EL1, Initial State:
 	 * Little Endian, MMU Disabled, i/dCache Disabled
 	 */
 	switch_el x1, 3f, 2f, 1f
 3:	set_vbar vbar_el3, x0
 	mrs	x0, scr_el3
 	orr	x0, x0, #0xf			/* SCR_EL3.NS|IRQ|FIQ|EA */
 	msr	scr_el3, x0
 	msr	cptr_el3, xzr			/* Enable FP/SIMD */
 #ifdef COUNTER_FREQUENCY
 	ldr	x0, =COUNTER_FREQUENCY
 	msr	cntfrq_el0, x0			/* Initialize CNTFRQ */
 #endif
 	b	0f
 2:	set_vbar	vbar_el2, x0
 	mov	x0, #0x33ff
 	msr	cptr_el2, x0			/* Enable FP/SIMD */
 	b	0f
 1:	set_vbar	vbar_el1, x0
 	mov	x0, #3 << 20
 	msr	cpacr_el1, x0			/* Enable FP/SIMD */
 0:
 	isb

 	/*
 	 * Enable SMPEN bit for coherency.
 	 * This register is not architectural but at the moment
 	 * this bit should be set for A53/A57/A72.
 	 */
 #ifdef CONFIG_ARMV8_SET_SMPEN
 	switch_el x1, 3f, 1f, 1f
 3:
 	mrs     x0, S3_1_c15_c2_1               /* cpuectlr_el1 */
 	orr     x0, x0, #0x40
 	msr     S3_1_c15_c2_1, x0
 	isb
 1:
 #endif

 	/* Apply ARM core specific erratas */
 	bl	apply_core_errata

 	/*
 	 * Cache/BPB/TLB Invalidate
 	 * i-cache is invalidated before enabled in icache_enable()
 	 * tlb is invalidated before mmu is enabled in dcache_enable()
 	 * d-cache is invalidated before enabled in dcache_enable()
 	 */

 	/* Processor specific initialization */
 	bl	lowlevel_init

 #if defined(CONFIG_ARMV8_SPIN_TABLE) && !defined(CONFIG_SPL_BUILD)
 	branch_if_master x0, x1, master_cpu
 	b	spin_table_secondary_jump
 	/* never return */
 #elif defined(CONFIG_ARMV8_MULTIENTRY)
 	branch_if_master x0, x1, master_cpu

 	/*
 	 * Slave CPUs
 	 */
 slave_cpu:
 	wfe
 	ldr	x1, =CPU_RELEASE_ADDR
 	ldr	x0, [x1]
 	cbz	x0, slave_cpu
 	br	x0			/* branch to the given address */
 #endif /* CONFIG_ARMV8_MULTIENTRY */
 master_cpu:
 	bl	_main

 #ifdef CONFIG_SYS_RESET_SCTRL
 reset_sctrl:
 	switch_el x1, 3f, 2f, 1f
 3:
 	mrs	x0, sctlr_el3
 	b	0f
 2:
 	mrs	x0, sctlr_el2
 	b	0f
 1:
 	mrs	x0, sctlr_el1

 0:
 	ldr	x1, =0xfdfffffa
 	and	x0, x0, x1

 	switch_el x1, 6f, 5f, 4f
 6:
 	msr	sctlr_el3, x0
 	b	7f
 5:
 	msr	sctlr_el2, x0
 	b	7f
 4:
 	msr	sctlr_el1, x0

 7:
 	dsb	sy
 	isb
 	b	__asm_invalidate_tlb_all
 	ret
 #endif

 /*-----------------------------------------------------------------------*/

 WEAK(apply_core_errata)

 	mov	x29, lr			/* Save LR */
 	/* For now, we support Cortex-A53, Cortex-A57 specific errata */

 	/* Check if we are running on a Cortex-A53 core */
 	branch_if_a53_core x0, apply_a53_core_errata

 	/* Check if we are running on a Cortex-A57 core */
 	branch_if_a57_core x0, apply_a57_core_errata
 0:
 	mov	lr, x29			/* Restore LR */
 	ret

 apply_a53_core_errata:

 #ifdef CONFIG_ARM_ERRATA_855873
 	mrs	x0, midr_el1
 	tst	x0, #(0xf << 20)
 	b.ne	0b

 	mrs	x0, midr_el1
 	and	x0, x0, #0xf
 	cmp	x0, #3
 	b.lt	0b

 	mrs	x0, S3_1_c15_c2_0	/* cpuactlr_el1 */
 	/* Enable data cache clean as data cache clean/invalidate */
 	orr	x0, x0, #1 << 44
 	msr	S3_1_c15_c2_0, x0	/* cpuactlr_el1 */
 	isb
 #endif
 	b 0b

 apply_a57_core_errata:

 #ifdef CONFIG_ARM_ERRATA_828024
 	mrs	x0, S3_1_c15_c2_0	/* cpuactlr_el1 */
 	/* Disable non-allocate hint of w-b-n-a memory type */
 	orr	x0, x0, #1 << 49
 	/* Disable write streaming no L1-allocate threshold */
 	orr	x0, x0, #3 << 25
 	/* Disable write streaming no-allocate threshold */
 	orr	x0, x0, #3 << 27
 	msr	S3_1_c15_c2_0, x0	/* cpuactlr_el1 */
 	isb
 #endif

 #ifdef CONFIG_ARM_ERRATA_826974
 	mrs	x0, S3_1_c15_c2_0	/* cpuactlr_el1 */
 	/* Disable speculative load execution ahead of a DMB */
 	orr	x0, x0, #1 << 59
 	msr	S3_1_c15_c2_0, x0	/* cpuactlr_el1 */
 	isb
 #endif

 #ifdef CONFIG_ARM_ERRATA_833471
 	mrs	x0, S3_1_c15_c2_0	/* cpuactlr_el1 */
 	/* FPSCR write flush.
 	 * Note that in some cases where a flush is unnecessary this
 	    could impact performance. */
 	orr	x0, x0, #1 << 38
 	msr	S3_1_c15_c2_0, x0	/* cpuactlr_el1 */
 	isb
 #endif

 #ifdef CONFIG_ARM_ERRATA_829520
 	mrs	x0, S3_1_c15_c2_0	/* cpuactlr_el1 */
 	/* Disable Indirect Predictor bit will prevent this erratum
 	    from occurring
 	 * Note that in some cases where a flush is unnecessary this
 	    could impact performance. */
 	orr	x0, x0, #1 << 4
 	msr	S3_1_c15_c2_0, x0	/* cpuactlr_el1 */
 	isb
 #endif

 #ifdef CONFIG_ARM_ERRATA_833069
 	mrs	x0, S3_1_c15_c2_0	/* cpuactlr_el1 */
 	/* Disable Enable Invalidates of BTB bit */
 	and	x0, x0, #0xE
 	msr	S3_1_c15_c2_0, x0	/* cpuactlr_el1 */
 	isb
 #endif
 	b 0b
 ENDPROC(apply_core_errata)

 /*-----------------------------------------------------------------------*/

 WEAK(lowlevel_init)
 	mov	x29, lr			/* Save LR */

 #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

 #ifdef CONFIG_ARMV8_MULTIENTRY
 	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 */

 2:
 	mov	lr, x29			/* Restore LR */
 	ret
 ENDPROC(lowlevel_init)

 WEAK(smp_kick_all_cpus)
 	/* Kick secondary cpus up by SGI 0 interrupt */
 #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
 	ldr	x0, =GICD_BASE
 	b	gic_kick_secondary_cpus
 #endif
 	ret
 ENDPROC(smp_kick_all_cpus)

 /*-----------------------------------------------------------------------*/

 ENTRY(c_runtime_cpu_setup)
 #if defined(CONFIG_ARMV8_SPL_EXCEPTION_VECTORS) || !defined(CONFIG_SPL_BUILD)
 	/* Relocate vBAR */
 	adr	x0, vectors
 	switch_el x1, 3f, 2f, 1f
 3:	msr	vbar_el3, x0
 	b	0f
 2:	msr	vbar_el2, x0
 	b	0f
 1:	msr	vbar_el1, x0
 0:
 #endif

 	ret
 ENDPROC(c_runtime_cpu_setup)

 WEAK(save_boot_params)
 	b	save_boot_params_ret	/* back to my caller */
 ENDPROC(save_boot_params)
	/* SPDX-License-Identifier: GPL-2.0+ */
	/*
	* (C) Copyright 2013
	* David Feng <fenghua@phytium.com.cn>
	*/

	#include <asm-offsets.h>
	#include <config.h>
	#include <linux/linkage.h>
	#include <asm/macro.h>
	#include <asm/armv8/mmu.h>

	/*************************************************************************
	*
	* Startup Code (reset vector)
	*
	*************************************************************************/

	.globl _start
	_start:
	#if defined(CONFIG_LINUX_KERNEL_IMAGE_HEADER)
	#include <asm/boot0-linux-kernel-header.h>
	#elif defined(CONFIG_ENABLE_ARM_SOC_BOOT0_HOOK)
	/*
	* Various SoCs need something special and SoC-specific up front in
	* order to boot, allow them to set that in their boot0.h file and then
	* use it here.
	*/
	#include <asm/arch/boot0.h>
	#else
	b reset
	#endif

	.align 3

	.globl _TEXT_BASE
	_TEXT_BASE:
	.quad CONFIG_SYS_TEXT_BASE

	/*
	* These are defined in the linker script.
	*/
	.globl _end_ofs
	_end_ofs:
	.quad _end - _start

	.globl _bss_start_ofs
	_bss_start_ofs:
	.quad __bss_start - _start

	.globl _bss_end_ofs
	_bss_end_ofs:
	.quad __bss_end - _start

	reset:
	/* Allow the board to save important registers */
	b save_boot_params
	.globl save_boot_params_ret
	save_boot_params_ret:

	#if CONFIG_POSITION_INDEPENDENT
	/* Verify that we're 4K aligned. */
	adr x0, _start
	ands x0, x0, #0xfff
	b.eq 1f
	0:
	/*
	* FATAL, can't continue.
	* U-Boot needs to be loaded at a 4K aligned address.
	*
	* We use ADRP and ADD to load some symbol addresses during startup.
	* The ADD uses an absolute (non pc-relative) lo12 relocation
	* thus requiring 4K alignment.
	*/
	wfi
	b 0b
	1:

	/*
	* Fix .rela.dyn relocations. This allows U-Boot to be loaded to and
	* executed at a different address than it was linked at.
	*/
	pie_fixup:
	adr x0, _start /* x0 <- Runtime value of _start */
	ldr x1, _TEXT_BASE /* x1 <- Linked value of _start */
	subs x9, x0, x1 /* x9 <- Run-vs-link offset */
	beq pie_fixup_done
	adrp x2, __rel_dyn_start /* x2 <- Runtime &__rel_dyn_start */
	add x2, x2, #:lo12:__rel_dyn_start
	adrp x3, __rel_dyn_end /* x3 <- Runtime &__rel_dyn_end */
	add x3, x3, #:lo12:__rel_dyn_end
	pie_fix_loop:
	ldp x0, x1, [x2], #16 /* (x0, x1) <- (Link location, fixup) */
	ldr x4, [x2], #8 /* x4 <- addend */
	cmp w1, #1027 /* relative fixup? */
	bne pie_skip_reloc
	/* relative fix: store addend plus offset at dest location */
	add x0, x0, x9
	add x4, x4, x9
	str x4, [x0]
	pie_skip_reloc:
	cmp x2, x3
	b.lo pie_fix_loop
	pie_fixup_done:
	#endif

	#ifdef CONFIG_SYS_RESET_SCTRL
	bl reset_sctrl
	#endif

	#if defined(CONFIG_ARMV8_SPL_EXCEPTION_VECTORS) \|\| !defined(CONFIG_SPL_BUILD)
	.macro set_vbar, regname, reg
	msr \regname, \reg
	.endm
	adr x0, vectors
	#else
	.macro set_vbar, regname, reg
	.endm
	#endif
	/*
	* Could be EL3/EL2/EL1, Initial State:
	* Little Endian, MMU Disabled, i/dCache Disabled
	*/
	switch_el x1, 3f, 2f, 1f
	3: set_vbar vbar_el3, x0
	mrs x0, scr_el3
	orr x0, x0, #0xf /* SCR_EL3.NS\|IRQ\|FIQ\|EA */
	msr scr_el3, x0
	msr cptr_el3, xzr /* Enable FP/SIMD */
	#ifdef COUNTER_FREQUENCY
	ldr x0, =COUNTER_FREQUENCY
	msr cntfrq_el0, x0 /* Initialize CNTFRQ */
	#endif
	b 0f
	2: set_vbar vbar_el2, x0
	mov x0, #0x33ff
	msr cptr_el2, x0 /* Enable FP/SIMD */
	b 0f
	1: set_vbar vbar_el1, x0
	mov x0, #3 << 20
	msr cpacr_el1, x0 /* Enable FP/SIMD */
	0:
	isb

	/*
	* Enable SMPEN bit for coherency.
	* This register is not architectural but at the moment
	* this bit should be set for A53/A57/A72.
	*/
	#ifdef CONFIG_ARMV8_SET_SMPEN
	switch_el x1, 3f, 1f, 1f
	3:
	mrs x0, S3_1_c15_c2_1 /* cpuectlr_el1 */
	orr x0, x0, #0x40
	msr S3_1_c15_c2_1, x0
	isb
	1:
	#endif

	/* Apply ARM core specific erratas */
	bl apply_core_errata

	/*
	* Cache/BPB/TLB Invalidate
	* i-cache is invalidated before enabled in icache_enable()
	* tlb is invalidated before mmu is enabled in dcache_enable()
	* d-cache is invalidated before enabled in dcache_enable()
	*/

	/* Processor specific initialization */
	bl lowlevel_init

	#if defined(CONFIG_ARMV8_SPIN_TABLE) && !defined(CONFIG_SPL_BUILD)
	branch_if_master x0, x1, master_cpu
	b spin_table_secondary_jump
	/* never return */
	#elif defined(CONFIG_ARMV8_MULTIENTRY)
	branch_if_master x0, x1, master_cpu

	/*
	* Slave CPUs
	*/
	slave_cpu:
	wfe
	ldr x1, =CPU_RELEASE_ADDR
	ldr x0, [x1]
	cbz x0, slave_cpu
	br x0 /* branch to the given address */
	#endif /* CONFIG_ARMV8_MULTIENTRY */
	master_cpu:
	bl _main

	#ifdef CONFIG_SYS_RESET_SCTRL
	reset_sctrl:
	switch_el x1, 3f, 2f, 1f
	3:
	mrs x0, sctlr_el3
	b 0f
	2:
	mrs x0, sctlr_el2
	b 0f
	1:
	mrs x0, sctlr_el1

	0:
	ldr x1, =0xfdfffffa
	and x0, x0, x1

	switch_el x1, 6f, 5f, 4f
	6:
	msr sctlr_el3, x0
	b 7f
	5:
	msr sctlr_el2, x0
	b 7f
	4:
	msr sctlr_el1, x0

	7:
	dsb sy
	isb
	b __asm_invalidate_tlb_all
	ret
	#endif

	/-----------------------------------------------------------------------/

	WEAK(apply_core_errata)

	mov x29, lr /* Save LR */
	/* For now, we support Cortex-A53, Cortex-A57 specific errata */

	/* Check if we are running on a Cortex-A53 core */
	branch_if_a53_core x0, apply_a53_core_errata

	/* Check if we are running on a Cortex-A57 core */
	branch_if_a57_core x0, apply_a57_core_errata
	0:
	mov lr, x29 /* Restore LR */
	ret

	apply_a53_core_errata:

	#ifdef CONFIG_ARM_ERRATA_855873
	mrs x0, midr_el1
	tst x0, #(0xf << 20)
	b.ne 0b

	mrs x0, midr_el1
	and x0, x0, #0xf
	cmp x0, #3
	b.lt 0b

	mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
	/* Enable data cache clean as data cache clean/invalidate */
	orr x0, x0, #1 << 44
	msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
	isb
	#endif
	b 0b

	apply_a57_core_errata:

	#ifdef CONFIG_ARM_ERRATA_828024
	mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
	/* Disable non-allocate hint of w-b-n-a memory type */
	orr x0, x0, #1 << 49
	/* Disable write streaming no L1-allocate threshold */
	orr x0, x0, #3 << 25
	/* Disable write streaming no-allocate threshold */
	orr x0, x0, #3 << 27
	msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
	isb
	#endif

	#ifdef CONFIG_ARM_ERRATA_826974
	mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
	/* Disable speculative load execution ahead of a DMB */
	orr x0, x0, #1 << 59
	msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
	isb
	#endif

	#ifdef CONFIG_ARM_ERRATA_833471
	mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
	/* FPSCR write flush.
	* Note that in some cases where a flush is unnecessary this
	could impact performance. */
	orr x0, x0, #1 << 38
	msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
	isb
	#endif

	#ifdef CONFIG_ARM_ERRATA_829520
	mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
	/* Disable Indirect Predictor bit will prevent this erratum
	from occurring
	* Note that in some cases where a flush is unnecessary this
	could impact performance. */
	orr x0, x0, #1 << 4
	msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
	isb
	#endif

	#ifdef CONFIG_ARM_ERRATA_833069
	mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
	/* Disable Enable Invalidates of BTB bit */
	and x0, x0, #0xE
	msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
	isb
	#endif
	b 0b
	ENDPROC(apply_core_errata)

	/-----------------------------------------------------------------------/

	WEAK(lowlevel_init)
	mov x29, lr /* Save LR */

	#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

	#ifdef CONFIG_ARMV8_MULTIENTRY
	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 */

	2:
	mov lr, x29 /* Restore LR */
	ret
	ENDPROC(lowlevel_init)

	WEAK(smp_kick_all_cpus)
	/* Kick secondary cpus up by SGI 0 interrupt */
	#if defined(CONFIG_GICV2) \|\| defined(CONFIG_GICV3)
	ldr x0, =GICD_BASE
	b gic_kick_secondary_cpus
	#endif
	ret
	ENDPROC(smp_kick_all_cpus)

	/-----------------------------------------------------------------------/

	ENTRY(c_runtime_cpu_setup)
	#if defined(CONFIG_ARMV8_SPL_EXCEPTION_VECTORS) \|\| !defined(CONFIG_SPL_BUILD)
	/* Relocate vBAR */
	adr x0, vectors
	switch_el x1, 3f, 2f, 1f
	3: msr vbar_el3, x0
	b 0f
	2: msr vbar_el2, x0
	b 0f
	1: msr vbar_el1, x0
	0:
	#endif

	ret
	ENDPROC(c_runtime_cpu_setup)

	WEAK(save_boot_params)
	b save_boot_params_ret /* back to my caller */
	ENDPROC(save_boot_params)