diff options
Diffstat (limited to 'drivers/acpi/tables/tbutils.c')
| -rw-r--r-- | drivers/acpi/tables/tbutils.c | 67 |
1 files changed, 64 insertions, 3 deletions
diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c index e69d01d443d2..6fc1e36e6042 100644 --- a/drivers/acpi/tables/tbutils.c +++ b/drivers/acpi/tables/tbutils.c @@ -61,6 +61,67 @@ acpi_tb_handle_to_object ( /******************************************************************************* * + * FUNCTION: acpi_tb_is_table_installed + * + * PARAMETERS: new_table_desc - Descriptor for new table being installed + * + * RETURN: Status - AE_ALREADY_EXISTS if the table is already installed + * + * DESCRIPTION: Determine if an ACPI table is already installed + * + * MUTEX: Table data structures should be locked + * + ******************************************************************************/ + +acpi_status +acpi_tb_is_table_installed ( + struct acpi_table_desc *new_table_desc) +{ + struct acpi_table_desc *table_desc; + + + ACPI_FUNCTION_TRACE ("tb_is_table_installed"); + + + /* Get the list descriptor and first table descriptor */ + + table_desc = acpi_gbl_table_lists[new_table_desc->type].next; + + /* Examine all installed tables of this type */ + + while (table_desc) { + /* Compare Revision and oem_table_id */ + + if ((table_desc->loaded_into_namespace) && + (table_desc->pointer->revision == + new_table_desc->pointer->revision) && + (!ACPI_MEMCMP (table_desc->pointer->oem_table_id, + new_table_desc->pointer->oem_table_id, 8))) { + /* This table is already installed */ + + ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, + "Table [%4.4s] already installed: Rev %X oem_table_id [%8.8s]\n", + new_table_desc->pointer->signature, + new_table_desc->pointer->revision, + new_table_desc->pointer->oem_table_id)); + + new_table_desc->owner_id = table_desc->owner_id; + new_table_desc->installed_desc = table_desc; + + return_ACPI_STATUS (AE_ALREADY_EXISTS); + } + + /* Get next table on the list */ + + table_desc = table_desc->next; + } + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * * FUNCTION: acpi_tb_validate_table_header * * PARAMETERS: table_header - Logical pointer to the table @@ -157,7 +218,7 @@ acpi_tb_verify_table_checksum ( /* Compute the checksum on the table */ - checksum = acpi_tb_checksum (table_header, table_header->length); + checksum = acpi_tb_generate_checksum (table_header, table_header->length); /* Return the appropriate exception */ @@ -175,7 +236,7 @@ acpi_tb_verify_table_checksum ( /******************************************************************************* * - * FUNCTION: acpi_tb_checksum + * FUNCTION: acpi_tb_generate_checksum * * PARAMETERS: Buffer - Buffer to checksum * Length - Size of the buffer @@ -187,7 +248,7 @@ acpi_tb_verify_table_checksum ( ******************************************************************************/ u8 -acpi_tb_checksum ( +acpi_tb_generate_checksum ( void *buffer, u32 length) { |