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/*
* Copyright (c) 2021, ARM Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*
* The traditional arm64 Linux kernel load address is 512KiB from the
* beginning of DRAM, caused by this having been the default value of the
* kernel's CONFIG_TEXT_OFFSET Kconfig value.
* However kernel version 5.8 changed the default offset (into a 2MB page)
* to 0, so TF-A's default assumption is no longer true. Fortunately the
* kernel got more relaxed about this offset at the same time, so it
* tolerates the wrong offset, but issues a warning:
* [Firmware Bug]: Kernel image misaligned at boot, please fix your bootloader!
*
* We cannot easily change the load address offset in TF-A to be 2MiB, because
* this would break older kernels - and they are not as forgiving in this
* respect.
*
* But we can allow users to load the kernel at the right offset, and
* offer this trampoline here to transition to this new load address.
* Any older kernels, or newer kernels misloaded, will overwrite this code
* here, so it does no harm in this case.
*/
#include <asm_macros.S>
#include <common/bl_common.ld.h>
.text
.global _tramp_start
_tramp_start:
adr x4, _tramp_start
orr x4, x4, #0x1fffff
add x4, x4, #1 /* align up to 2MB */
br x4
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