plat/nvidia/tegra/soc/t194/plat_trampoline.S

/*
 * Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <arch.h>
#include <asm_macros.S>
#include <plat/common/common_def.h>
#include <memctrl_v2.h>
#include <tegra_def.h>

#define TEGRA194_SMMU_CTX_SIZE		0x490

	.align 4
	.globl	tegra194_cpu_reset_handler

/* CPU reset handler routine */
func tegra194_cpu_reset_handler
	/*
	 * The TZRAM loses state during System Suspend. We use this
	 * information to decide if the reset handler is running after a
	 * System Suspend. Resume from system suspend requires restoring
	 * the entire state from TZDRAM to TZRAM.
	 */
	mov	x0, #BL31_BASE
	ldr	x0, [x0]
	cbnz	x0, boot_cpu

	/* resume from system suspend */
	mov	x0, #BL31_BASE
	adr	x1, __tegra194_cpu_reset_handler_end
	adr	x2, __tegra194_cpu_reset_handler_data
	ldr	x2, [x2, #8]

	/* memcpy16 */
m_loop16:
	cmp	x2, #16
	b.lt	m_loop1
	ldp	x3, x4, [x1], #16
	stp	x3, x4, [x0], #16
	sub	x2, x2, #16
	b	m_loop16
	/* copy byte per byte */
m_loop1:
	cbz	x2, boot_cpu
	ldrb	w3, [x1], #1
	strb	w3, [x0], #1
	subs	x2, x2, #1
	b.ne	m_loop1

boot_cpu:
	adr	x0, __tegra194_cpu_reset_handler_data
	ldr	x0, [x0]
	br	x0
endfunc tegra194_cpu_reset_handler

	/*
	 * Tegra194 reset data (offset 0x0 - 0x2490)
	 *
	 * 0x0000: secure world's entrypoint
	 * 0x0008: BL31 size (RO + RW)
	 * 0x0010: SMMU context start
	 * 0x2490: SMMU context end
	 */

	.align 4
	.type	__tegra194_cpu_reset_handler_data, %object
	.globl	__tegra194_cpu_reset_handler_data
__tegra194_cpu_reset_handler_data:
	.quad	tegra_secure_entrypoint
	.quad	__BL31_END__ - BL31_BASE
	.globl	__tegra194_smmu_ctx_start
__tegra194_smmu_ctx_start:
	.rept	TEGRA194_SMMU_CTX_SIZE
	.quad	0
	.endr
	.size	__tegra194_cpu_reset_handler_data, \
		. - __tegra194_cpu_reset_handler_data

	.align 4
	.globl	__tegra194_cpu_reset_handler_end
__tegra194_cpu_reset_handler_end: