FADT.sci_interrupt 的产生

来源：互联网发布：淘宝大表情编辑：程序博客网时间：2024/05/29 11:19

acpi_enable_subsystem->acpi_ev_install_xrupt_handlers->acpi_ev_install_sci_handler
u32 acpi_ev_install_sci_handler(void)
{
   u32 status = AE_OK;

   ACPI_FUNCTION_TRACE(ev_install_sci_handler);

   status =
        acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
                          acpi_ev_sci_xrupt_handler,
                          acpi_gbl_gpe_xrupt_list_head);
   return_ACPI_STATUS(status);
}
acpi_ev_install_sci_handler 就会为acpi_gbl_FADT.sci_interrupt 注册中断函数，这样当uefi执行notify函数的时候就会调用acpi_ev_sci_xrupt_handler
acpi_ev_fixed_event_detect->acpi_ev_fixed_event_detect
u32 acpi_ev_fixed_event_detect(void)
{
   u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
   u32 fixed_status;
   u32 fixed_enable;
   u32 i;

   ACPI_FUNCTION_NAME(ev_fixed_event_detect);

   /*
   * Read the fixed feature status and enable registers, as all the cases
   * depend on their values. Ignore errors here.
   */
   (void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
   (void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);

   ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
              "Fixed Event Block: Enable %08X Status %08X\n",
              fixed_enable, fixed_status));

   /*
   * Check for all possible Fixed Events and dispatch those that are active
   */
   for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {

       /* Both the status and enable bits must be on for this event */

       if ((fixed_status & acpi_gbl_fixed_event_info[i].
             status_bit_mask)
            && (fixed_enable & acpi_gbl_fixed_event_info[i].
           enable_bit_mask)) {
           /*
           * Found an active (signalled) event. Invoke global event
           * handler if present.
           */
           acpi_fixed_event_count[i]++;
           if (acpi_gbl_global_event_handler) {
               acpi_gbl_global_event_handler
                    (ACPI_EVENT_TYPE_FIXED, NULL, i,
                     acpi_gbl_global_event_handler_context);
           }

           int_status |= acpi_ev_fixed_event_dispatch(i);
       }
   }

   return (int_status);
}
acpi_ev_fixed_event_detect 就会根据event 来调用对应的handler，针对button.c 就是acpi_device_fixed_event

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