mirror of
https://github.com/u-boot/u-boot.git
synced 2024-12-04 10:03:41 +08:00
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
/*
|
|
* A lowlevel_init function that sets up the stack to call a C function to
|
|
* perform further init.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <asm-offsets.h>
|
|
#include <config.h>
|
|
#include <linux/linkage.h>
|
|
|
|
ENTRY(lowlevel_init)
|
|
/*
|
|
* Setup a temporary stack. Global data is not available yet.
|
|
*/
|
|
#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
|
|
ldr w0, =CONFIG_SPL_STACK
|
|
#else
|
|
ldr w0, =CONFIG_SYS_INIT_SP_ADDR
|
|
#endif
|
|
bic sp, x0, #0xf /* 16-byte alignment for ABI compliance */
|
|
|
|
/*
|
|
* Save the old LR(passed in x29) and the current LR to stack
|
|
*/
|
|
stp x29, x30, [sp, #-16]!
|
|
|
|
/*
|
|
* Call the very early init function. This should do only the
|
|
* absolute bare minimum to get started. It should not:
|
|
*
|
|
* - set up DRAM
|
|
* - use global_data
|
|
* - clear BSS
|
|
* - try to start a console
|
|
*
|
|
* For boards with SPL this should be empty since SPL can do all of
|
|
* this init in the SPL board_init_f() function which is called
|
|
* immediately after this.
|
|
*/
|
|
bl s_init
|
|
ldp x29, x30, [sp]
|
|
ret
|
|
ENDPROC(lowlevel_init)
|