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arm: armv8: save boot arguments

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Save boot arguments x[0-3] into an array for handover of bloblist from
previous boot stage.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Raymond Mao 2024-02-03 08:36:24 -08:00 committed by Tom Rini
parent 5103e69344
commit 11f3171256
1 changed files with 23 additions and 0 deletions
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23
arch/arm/cpu/armv8/start.S
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@ -370,5 +370,28 @@ ENTRY(c_runtime_cpu_setup)
ENDPROC(c_runtime_cpu_setup)
WEAK(save_boot_params)
#if (IS_ENABLED(CONFIG_BLOBLIST))
/* Calculate the PC-relative address of saved_args */
adr x9, saved_args_offset
ldr w10, saved_args_offset
add x9, x9, w10, sxtw
stp x0, x1, [x9]
stp x2, x3, [x9, #16]
#endif
b save_boot_params_ret /* back to my caller */
ENDPROC(save_boot_params)
#if (IS_ENABLED(CONFIG_BLOBLIST))
saved_args_offset:
.long saved_args - . /* offset from current code to save_args */
.section .data
.align 2
.global saved_args
saved_args:
.rept 4
.dword 0
.endr
END(saved_args)
#endif