diff options
Diffstat (limited to 'drivers/acpi/tables/tbutils.c')
| -rw-r--r-- | drivers/acpi/tables/tbutils.c | 178 |
1 files changed, 111 insertions, 67 deletions
diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c index e69d01d443d2..4b2fbb592f49 100644 --- a/drivers/acpi/tables/tbutils.c +++ b/drivers/acpi/tables/tbutils.c @@ -41,23 +41,84 @@ * POSSIBILITY OF SUCH DAMAGES. */ - #include <acpi/acpi.h> #include <acpi/actables.h> - #define _COMPONENT ACPI_TABLES - ACPI_MODULE_NAME ("tbutils") +ACPI_MODULE_NAME("tbutils") /* Local prototypes */ - #ifdef ACPI_OBSOLETE_FUNCTIONS acpi_status -acpi_tb_handle_to_object ( - u16 table_id, - struct acpi_table_desc **table_desc); +acpi_tb_handle_to_object(u16 table_id, struct acpi_table_desc **table_desc); #endif +/******************************************************************************* + * + * 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) { + /* + * If the table lengths match, perform a full bytewise compare. This + * means that we will allow tables with duplicate oem_table_id(s), as + * long as the tables are different in some way. + * + * Checking if the table has been loaded into the namespace means that + * we don't check for duplicate tables during the initial installation + * of tables within the RSDT/XSDT. + */ + if ((table_desc->loaded_into_namespace) && + (table_desc->pointer->length == + new_table_desc->pointer->length) + && + (!ACPI_MEMCMP + ((const char *)table_desc->pointer, + (const char *)new_table_desc->pointer, + (acpi_size) new_table_desc->pointer->length))) { + /* Match: 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); +} /******************************************************************************* * @@ -80,57 +141,55 @@ acpi_tb_handle_to_object ( ******************************************************************************/ acpi_status -acpi_tb_validate_table_header ( - struct acpi_table_header *table_header) +acpi_tb_validate_table_header(struct acpi_table_header *table_header) { - acpi_name signature; - - - ACPI_FUNCTION_NAME ("tb_validate_table_header"); + acpi_name signature; + ACPI_FUNCTION_NAME("tb_validate_table_header"); /* Verify that this is a valid address */ - if (!acpi_os_readable (table_header, sizeof (struct acpi_table_header))) { - ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, - "Cannot read table header at %p\n", table_header)); + if (!acpi_os_readable(table_header, sizeof(struct acpi_table_header))) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Cannot read table header at %p\n", + table_header)); return (AE_BAD_ADDRESS); } /* Ensure that the signature is 4 ASCII characters */ - ACPI_MOVE_32_TO_32 (&signature, table_header->signature); - if (!acpi_ut_valid_acpi_name (signature)) { - ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, - "Table signature at %p [%p] has invalid characters\n", - table_header, &signature)); + ACPI_MOVE_32_TO_32(&signature, table_header->signature); + if (!acpi_ut_valid_acpi_name(signature)) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Table signature at %p [%p] has invalid characters\n", + table_header, &signature)); - ACPI_REPORT_WARNING (("Invalid table signature found: [%4.4s]\n", - (char *) &signature)); + ACPI_REPORT_WARNING(("Invalid table signature found: [%4.4s]\n", + (char *)&signature)); - ACPI_DUMP_BUFFER (table_header, sizeof (struct acpi_table_header)); + ACPI_DUMP_BUFFER(table_header, + sizeof(struct acpi_table_header)); return (AE_BAD_SIGNATURE); } /* Validate the table length */ - if (table_header->length < sizeof (struct acpi_table_header)) { - ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, - "Invalid length in table header %p name %4.4s\n", - table_header, (char *) &signature)); + if (table_header->length < sizeof(struct acpi_table_header)) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Invalid length in table header %p name %4.4s\n", + table_header, (char *)&signature)); - ACPI_REPORT_WARNING (("Invalid table header length (0x%X) found\n", - (u32) table_header->length)); + ACPI_REPORT_WARNING(("Invalid table header length (0x%X) found\n", (u32) table_header->length)); - ACPI_DUMP_BUFFER (table_header, sizeof (struct acpi_table_header)); + ACPI_DUMP_BUFFER(table_header, + sizeof(struct acpi_table_header)); return (AE_BAD_HEADER); } return (AE_OK); } - /******************************************************************************* * * FUNCTION: acpi_tb_verify_table_checksum @@ -145,37 +204,31 @@ acpi_tb_validate_table_header ( ******************************************************************************/ acpi_status -acpi_tb_verify_table_checksum ( - struct acpi_table_header *table_header) +acpi_tb_verify_table_checksum(struct acpi_table_header * table_header) { - u8 checksum; - acpi_status status = AE_OK; - - - ACPI_FUNCTION_TRACE ("tb_verify_table_checksum"); + u8 checksum; + acpi_status status = AE_OK; + ACPI_FUNCTION_TRACE("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 */ if (checksum) { - ACPI_REPORT_WARNING (( - "Invalid checksum in table [%4.4s] (%02X, sum %02X is not zero)\n", - table_header->signature, (u32) table_header->checksum, - (u32) checksum)); + ACPI_REPORT_WARNING(("Invalid checksum in table [%4.4s] (%02X, sum %02X is not zero)\n", table_header->signature, (u32) table_header->checksum, (u32) checksum)); status = AE_BAD_CHECKSUM; } - return_ACPI_STATUS (status); + return_ACPI_STATUS(status); } - /******************************************************************************* * - * FUNCTION: acpi_tb_checksum + * FUNCTION: acpi_tb_generate_checksum * * PARAMETERS: Buffer - Buffer to checksum * Length - Size of the buffer @@ -186,15 +239,11 @@ acpi_tb_verify_table_checksum ( * ******************************************************************************/ -u8 -acpi_tb_checksum ( - void *buffer, - u32 length) +u8 acpi_tb_generate_checksum(void *buffer, u32 length) { - const u8 *limit; - const u8 *rover; - u8 sum = 0; - + const u8 *limit; + const u8 *rover; + u8 sum = 0; if (buffer && length) { /* Buffer and Length are valid */ @@ -208,7 +257,6 @@ acpi_tb_checksum ( return (sum); } - #ifdef ACPI_OBSOLETE_FUNCTIONS /******************************************************************************* * @@ -224,16 +272,13 @@ acpi_tb_checksum ( ******************************************************************************/ acpi_status -acpi_tb_handle_to_object ( - u16 table_id, - struct acpi_table_desc **return_table_desc) +acpi_tb_handle_to_object(u16 table_id, + struct acpi_table_desc ** return_table_desc) { - u32 i; - struct acpi_table_desc *table_desc; - - - ACPI_FUNCTION_NAME ("tb_handle_to_object"); + u32 i; + struct acpi_table_desc *table_desc; + ACPI_FUNCTION_NAME("tb_handle_to_object"); for (i = 0; i < ACPI_TABLE_MAX; i++) { table_desc = acpi_gbl_table_lists[i].next; @@ -247,9 +292,8 @@ acpi_tb_handle_to_object ( } } - ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "table_id=%X does not exist\n", table_id)); + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "table_id=%X does not exist\n", + table_id)); return (AE_BAD_PARAMETER); } #endif - - |