mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-06 03:06:16 +09:00
e6a0586277
TPL builds today don't need to call into firmware or set up the MMU (if this changes, it should be controlled through a config option whether to include this or not), but include the needed support code for this anyway. By moving these unused low-level functions into seperate function-sections, the linker can garbage-collect the unused sections. Note that (if DM support is enabled), there will be a call to the cache-flushing code from alloc_priv(...) in drivers/core/device.c. This then add 52 bytes of binary size (an increase from 20589 to 20641 bytes) compared to completely removing this code. Even for a feature-rich TPL (including DM support as for the RK3368), this equates to a size difference of significantly more than 10% in TPL binary size. Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: Simon Glass <sjg@chromium.org>
53 lines
1.1 KiB
ArmAsm
53 lines
1.1 KiB
ArmAsm
/*
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* (C) Copyright 2013
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* David Feng <fenghua@phytium.com.cn>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <linux/linkage.h>
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#include <asm/macro.h>
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.pushsection .text.armv8_switch_to_el2, "ax"
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ENTRY(armv8_switch_to_el2)
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switch_el x6, 1f, 0f, 0f
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0:
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cmp x5, #ES_TO_AARCH64
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b.eq 2f
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/*
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* When loading 32-bit kernel, it will jump
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* to secure firmware again, and never return.
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*/
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bl armv8_el2_to_aarch32
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2:
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/*
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* x4 is kernel entry point or switch_to_el1
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* if CONFIG_ARMV8_SWITCH_TO_EL1 is defined.
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* When running in EL2 now, jump to the
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* address saved in x4.
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*/
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br x4
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1: armv8_switch_to_el2_m x4, x5, x6
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ENDPROC(armv8_switch_to_el2)
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.popsection
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.pushsection .text.armv8_switch_to_el1, "ax"
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ENTRY(armv8_switch_to_el1)
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switch_el x6, 0f, 1f, 0f
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0:
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/* x4 is kernel entry point. When running in EL1
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* now, jump to the address saved in x4.
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*/
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br x4
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1: armv8_switch_to_el1_m x4, x5, x6
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ENDPROC(armv8_switch_to_el1)
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.popsection
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.pushsection .text.armv8_el2_to_aarch32, "ax"
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WEAK(armv8_el2_to_aarch32)
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ret
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ENDPROC(armv8_el2_to_aarch32)
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.popsection
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