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 --- Changes in v2 - New patch file created for v2. Changes in V5 - Drop the dependence on OF_BOARD. Changes in V7 - Exclude the saved_args when BLOBLIST is disabled. Changes in V8 - Use PC-relative reference for saved_args. - Add 4-byte alignment for saved_args.
arch/arm/cpu/armv8/start.S | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S index 6cc1d26e5e..7461280261 100644 --- a/arch/arm/cpu/armv8/start.S +++ b/arch/arm/cpu/armv8/start.S @@ -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