Save boot arguments r[0-3] into an array for handover of bloblist from previous boot stage.
Signed-off-by: Raymond Mao raymond.mao@linaro.org --- Changes in v2 - New patch file created for v2. Changes in v3 - Swap value of r0 with r2. Changes in v4 - Fix a bug when saving the boot args.
arch/arm/cpu/armv7/start.S | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 69e281b086..66372e4c68 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -152,9 +152,28 @@ ENDPROC(c_runtime_cpu_setup) * *************************************************************************/ WEAK(save_boot_params) +#if (IS_ENABLED(CONFIG_OF_BOARD) && IS_ENABLED(CONFIG_BLOBLIST)) + ldr r12, =saved_args + /* + * Intentionally swapping r0 with r2 in order to simplify the C + * function we use later. + */ + str r2, [r12] + str r1, [r12, #4] + str r0, [r12, #8] + str r3, [r12, #12] +#endif b save_boot_params_ret @ back to my caller ENDPROC(save_boot_params)
+.section .data +.global saved_args +saved_args: + .rept 4 + .word 0 + .endr +END(saved_args) + #ifdef CONFIG_ARMV7_LPAE WEAK(switch_to_hypervisor) b switch_to_hypervisor_ret