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ACPI 5.0: Implement hardware-reduced option

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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: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2011-11-16 10:57:28 +08:00 committed by Len Brown
parent 2355e10f07
commit 22e5b40ab2
6 changed files with 58 additions and 3 deletions
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13
drivers/acpi/acpica/acglobal.h
View File

@ -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
*
****************************************************************************/

12
drivers/acpi/acpica/evevent.c
View File

@ -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();

6
drivers/acpi/acpica/evglock.c
View File

@ -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,

22
drivers/acpi/acpica/tbfadt.c
View File

@ -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++) {

7
drivers/acpi/acpica/tbutils.c
View File

@ -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,

1
include/acpi/acpixf.h
View File

@ -74,6 +74,7 @@ extern u8 acpi_gbl_disable_auto_repair;
extern u32 acpi_current_gpe_count;
extern struct acpi_table_fadt acpi_gbl_FADT;
extern u8 acpi_gbl_system_awake_and_running;
extern u8 acpi_gbl_reduced_hardware; /* ACPI 5.0 */
extern u32 acpi_rsdt_forced;
/*