diff options
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/events/evxfevnt.c | 8 | ||||
| -rw-r--r-- | drivers/acpi/tables/tbutils.c | 23 |
2 files changed, 31 insertions, 0 deletions
diff --git a/drivers/acpi/events/evxfevnt.c b/drivers/acpi/events/evxfevnt.c index a3d148e4d39..4eab4f5a100 100644 --- a/drivers/acpi/events/evxfevnt.c +++ b/drivers/acpi/events/evxfevnt.c @@ -65,6 +65,14 @@ acpi_status acpi_enable(void) ACPI_FUNCTION_TRACE(acpi_enable); + /* ACPI tables must be present */ + + if (!acpi_tb_tables_loaded()) { + return_ACPI_STATUS(AE_NO_ACPI_TABLES); + } + + /* Check current mode */ + if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { ACPI_DEBUG_PRINT((ACPI_DB_INIT, "System is already in ACPI mode\n")); diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c index 0cb743962fa..0874ab29978 100644 --- a/drivers/acpi/tables/tbutils.c +++ b/drivers/acpi/tables/tbutils.c @@ -54,6 +54,29 @@ acpi_tb_get_root_table_entry(u8 * table_entry, /******************************************************************************* * + * FUNCTION: acpi_tb_tables_loaded + * + * PARAMETERS: None + * + * RETURN: TRUE if required ACPI tables are loaded + * + * DESCRIPTION: Determine if the minimum required ACPI tables are present + * (FADT, FACS, DSDT) + * + ******************************************************************************/ + +u8 acpi_tb_tables_loaded(void) +{ + + if (acpi_gbl_root_table_list.count >= 3) { + return (TRUE); + } + + return (FALSE); +} + +/******************************************************************************* + * * FUNCTION: acpi_tb_print_table_header * * PARAMETERS: Address - Table physical address |