RTEMS | bsp/aarch64/raspberrypi: Add Mailbox Support (!915)

[Shaunak Datar (@skdatar)]

Shaunak Datar commented on a discussion on bsps/aarch64/raspberrypi/start/mailbox.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_139002

 > +}
 > +
 > +rtems_status_code rpi_mbox_process(mbox_property_message* msg){
 > +    rtems_cache_flush_multiple_data_lines(msg, msg->header.size);
 > +    rpi_mbox_write(PROPERTY_TAGS_ARM_TO_VC, (uint32_t)(uintptr_t)msg);
 > +    rpi_mbox_read(PROPERTY_TAGS_ARM_TO_VC);
 > +    rtems_cache_invalidate_multiple_data_lines(msg, msg->header.size);
 > +    return (msg->header.req_resp == BCM2711_MBOX_RESPONSE)? RTEMS_SUCCESSFUL : RTEMS_IO_ERROR;
 > +}
 > +
 > +rtems_status_code rpi_mbox_property_message_init( mbox_property_message *msg, size_t buffer_size, const mbox_property_tag_metadata *tags, unsigned int tag_count ){
 > +    uintptr_t head = (uintptr_t)msg->buffer;
 > +    uintptr_t end = (uintptr_t)(msg) + buffer_size;
 > +
 > +    for( unsigned int i = 0; i < tag_count; i++ ){
 > +        if(head + mbox_tag_total_size(tags[i].value_size) > end){

Made the required formatting changes

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_139002
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