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aa9226f0ed
For boards that call s_init() when the SPL runs, we are expected to setup an early stack before calling this C function. Implement the proper AArch64 version of this based on the ARMv7 code. This allows sunxi boards to setup the basic peripherals even with a 64-bit SPL. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagan Teki <jagan@openedev.com>
45 lines
1.0 KiB
ArmAsm
45 lines
1.0 KiB
ArmAsm
/*
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* A lowlevel_init function that sets up the stack to call a C function to
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* perform further init.
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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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ENTRY(lowlevel_init)
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/*
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* Setup a temporary stack. Global data is not available yet.
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*/
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#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
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ldr w0, =CONFIG_SPL_STACK
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#else
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ldr w0, =CONFIG_SYS_INIT_SP_ADDR
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#endif
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bic sp, x0, #0xf /* 16-byte alignment for ABI compliance */
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/*
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* Save the old LR(passed in x29) and the current LR to stack
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*/
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stp x29, x30, [sp, #-16]!
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/*
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* Call the very early init function. This should do only the
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* absolute bare minimum to get started. It should not:
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*
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* - set up DRAM
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* - use global_data
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* - clear BSS
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* - try to start a console
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*
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* For boards with SPL this should be empty since SPL can do all of
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* this init in the SPL board_init_f() function which is called
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* immediately after this.
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*/
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bl s_init
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ldp x29, x30, [sp]
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ret
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ENDPROC(lowlevel_init)
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