Commit 22e5b40a authored by Bob Moore's avatar Bob Moore Committed by Len Brown
Browse files

ACPI 5.0: Implement hardware-reduced option 



If HW-reduced flag is set in the FADT, do not attempt to access
or initialize any ACPI hardware, including SCI and global lock.
No FACS will be present.

Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 2355e10f

drivers/acpi/acpica/acglobal.h

+12 −1
Original line number Diff line number Diff line
@@ -140,8 +140,19 @@ u32 acpi_gbl_trace_flags; 
acpi_name acpi_gbl_trace_method_name;

u8 acpi_gbl_system_awake_and_running;



/*

 * ACPI 5.0 introduces the concept of a "reduced hardware platform", meaning

 * that the ACPI hardware is no longer required. A flag in the FADT indicates

 * a reduced HW machine, and that flag is duplicated here for convenience.

 */

u8 acpi_gbl_reduced_hardware;



#endif



/* Do not disassemble buffers to resource descriptors */



ACPI_EXTERN u8 ACPI_INIT_GLOBAL(acpi_gbl_no_resource_disassembly, FALSE);



/*****************************************************************************

 *

 * Debug support
@@ -207,7 +218,7 @@ ACPI_EXTERN struct acpi_rw_lock acpi_gbl_namespace_rw_lock; 


/*****************************************************************************

 *

 * Mutual exlusion within ACPICA subsystem

 * Mutual exclusion within ACPICA subsystem

 *

 ****************************************************************************/

drivers/acpi/acpica/evevent.c

+12 −0
Original line number Diff line number Diff line
@@ -71,6 +71,12 @@ acpi_status acpi_ev_initialize_events(void) 


	ACPI_FUNCTION_TRACE(ev_initialize_events);



	/* If Hardware Reduced flag is set, there are no fixed events */



	if (acpi_gbl_reduced_hardware) {

		return_ACPI_STATUS(AE_OK);

	}



	/*

	 * Initialize the Fixed and General Purpose Events. This is done prior to

	 * enabling SCIs to prevent interrupts from occurring before the handlers
@@ -111,6 +117,12 @@ acpi_status acpi_ev_install_xrupt_handlers(void) 


	ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);



	/* If Hardware Reduced flag is set, there is no ACPI h/w */



	if (acpi_gbl_reduced_hardware) {

		return_ACPI_STATUS(AE_OK);

	}



	/* Install the SCI handler */



	status = acpi_ev_install_sci_handler();

drivers/acpi/acpica/evglock.c

+6 −0
Original line number Diff line number Diff line
@@ -70,6 +70,12 @@ acpi_status acpi_ev_init_global_lock_handler(void) 


	ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);



	/* If Hardware Reduced flag is set, there is no global lock */



	if (acpi_gbl_reduced_hardware) {

		return_ACPI_STATUS(AE_OK);

	}



	/* Attempt installation of the global lock handler */



	status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,

drivers/acpi/acpica/tbfadt.c

+20 −2
Original line number Diff line number Diff line
@@ -253,8 +253,13 @@ void acpi_tb_parse_fadt(u32 table_index) 
	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,

			      ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);



	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,

			      ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);

	/* If Hardware Reduced flag is set, there is no FACS */



	if (!acpi_gbl_reduced_hardware) {

		acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.

				      Xfacs, ACPI_SIG_FACS,

				      ACPI_TABLE_INDEX_FACS);

	}

}



/*******************************************************************************
@@ -297,6 +302,13 @@ void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length) 
	ACPI_MEMCPY(&acpi_gbl_FADT, table,

		    ACPI_MIN(length, sizeof(struct acpi_table_fadt)));



	/* Take a copy of the Hardware Reduced flag */



	acpi_gbl_reduced_hardware = FALSE;

	if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {

		acpi_gbl_reduced_hardware = TRUE;

	}



	/* Convert the local copy of the FADT to the common internal format */



	acpi_tb_convert_fadt();
@@ -502,6 +514,12 @@ static void acpi_tb_validate_fadt(void) 
		acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;

	}



	/* If Hardware Reduced flag is set, we are all done */



	if (acpi_gbl_reduced_hardware) {

		return;

	}



	/* Examine all of the 64-bit extended address fields (X fields) */



	for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {

drivers/acpi/acpica/tbutils.c

+7 −0
Original line number Diff line number Diff line
@@ -135,6 +135,13 @@ acpi_status acpi_tb_initialize_facs(void) 
{

	acpi_status status;



	/* If Hardware Reduced flag is set, there is no FACS */



	if (acpi_gbl_reduced_hardware) {

		acpi_gbl_FACS = NULL;

		return (AE_OK);

	}



	status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,

					 ACPI_CAST_INDIRECT_PTR(struct

								acpi_table_header,