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arm: arm926ej-s: start.S: port save_boot_params support from armv7 code

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The ARMv7 start code has support for saving some boot params at the
entry point, which is used by some SoCs to return to BROM.

Port this to ARM926EJ-S start code.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
This commit is contained in:
Icenowy Zheng 2022-01-29 10:23:00 -05:00 committed by Andre Przywara
parent f2c33699d1
commit 508f75afb5
1 changed files with 19 additions and 0 deletions
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19
arch/arm/cpu/arm926ejs/start.S
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@ -17,6 +17,7 @@
#include <asm-offsets.h>
#include <config.h>
#include <common.h>
#include <linux/linkage.h>
/*
*************************************************************************
@ -32,8 +33,13 @@
*/
.globl reset
.globl save_boot_params_ret
.type save_boot_params_ret,%function
reset:
/* Allow the board to save important registers */
b save_boot_params
save_boot_params_ret:
/*
* set the cpu to SVC32 mode
*/
@ -110,3 +116,16 @@ flush_dcache:
#endif
mov pc, lr /* back to my caller */
#endif /* CONFIG_IS_ENABLED(SKIP_LOWLEVEL_INIT) */
/*************************************************************************
*
* void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
* __attribute__((weak));
*
* Stack pointer is not yet initialized at this moment
* Don't save anything to stack even if compiled with -O0
*
*************************************************************************/
WEAK(save_boot_params)
b save_boot_params_ret /* back to my caller */
ENDPROC(save_boot_params)