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authorBob Moore <robert.moore@intel.com>2006-03-31 00:00:00 -0500
committerLen Brown <len.brown@intel.com>2006-06-14 02:04:16 -0400
commit793c2388cae3fd023b3b5166354931752d42353c (patch)
tree6859cde48677cf1e9b9766cd1d95081a863c060c /drivers/acpi/tables/tbutils.c
parent61686124f47d7c4b78610346c5f8f9d8a6d46bb5 (diff)
ACPI: ACPICA 20060331
Implemented header file support for the following additional ACPI tables: ASF!, BOOT, CPEP, DBGP, MCFG, SPCR, SPMI, TCPA, and WDRT. With this support, all current and known ACPI tables are now defined in the ACPICA headers and are available for use by device drivers and other software. Implemented support to allow tables that contain ACPI names with invalid characters to be loaded. Previously, this would cause the table load to fail, but since there are several known cases of such tables on existing machines, this change was made to enable ACPI support for them. Also, this matches the behavior of the Microsoft ACPI implementation. https://bugzilla.novell.com/show_bug.cgi?id=147621 Fixed a couple regressions introduced during the memory optimization in the 20060317 release. The namespace node definition required additional reorganization and an internal datatype that had been changed to 8-bit was restored to 32-bit. (Valery Podrezov) Fixed a problem where a null pointer passed to acpi_ut_delete_generic_state() could be passed through to acpi_os_release_object which is unexpected. Such null pointers are now trapped and ignored, matching the behavior of the previous implementation before the deployment of acpi_os_release_object(). (Valery Podrezov, Fiodor Suietov) Fixed a memory mapping leak during the deletion of a SystemMemory operation region where a cached memory mapping was not deleted. This became a noticeable problem for operation regions that are defined within frequently used control methods. (Dana Meyers) Reorganized the ACPI table header files into two main files: one for the ACPI tables consumed by the ACPICA core, and another for the miscellaneous ACPI tables that are consumed by the drivers and other software. The various FADT definitions were merged into one common section and three different tables (ACPI 1.0, 1.0+, and 2.0) Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/tables/tbutils.c')
-rw-r--r--drivers/acpi/tables/tbutils.c122
1 files changed, 84 insertions, 38 deletions
diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c
index b463d4b8882..f8d28ae8811 100644
--- a/drivers/acpi/tables/tbutils.c
+++ b/drivers/acpi/tables/tbutils.c
@@ -193,73 +193,119 @@ acpi_tb_validate_table_header(struct acpi_table_header *table_header)
/*******************************************************************************
*
- * FUNCTION: acpi_tb_verify_table_checksum
+ * FUNCTION: acpi_tb_sum_table
*
- * PARAMETERS: *table_header - ACPI table to verify
+ * PARAMETERS: Buffer - Buffer to sum
+ * Length - Size of the buffer
*
- * RETURN: 8 bit checksum of table
+ * RETURN: 8 bit sum of buffer
*
- * DESCRIPTION: Does an 8 bit checksum of table and returns status. A correct
- * table should have a checksum of 0.
+ * DESCRIPTION: Computes an 8 bit sum of the buffer(length) and returns it.
*
******************************************************************************/
-acpi_status
-acpi_tb_verify_table_checksum(struct acpi_table_header * table_header)
+u8 acpi_tb_sum_table(void *buffer, u32 length)
+{
+ acpi_native_uint i;
+ u8 sum = 0;
+
+ if (!buffer || !length) {
+ return (0);
+ }
+
+ for (i = 0; i < length; i++) {
+ sum = (u8) (sum + ((u8 *) buffer)[i]);
+ }
+ return (sum);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_generate_checksum
+ *
+ * PARAMETERS: Table - Pointer to a valid ACPI table (with a
+ * standard ACPI header)
+ *
+ * RETURN: 8 bit checksum of buffer
+ *
+ * DESCRIPTION: Computes an 8 bit checksum of the table.
+ *
+ ******************************************************************************/
+
+u8 acpi_tb_generate_checksum(struct acpi_table_header * table)
{
u8 checksum;
- acpi_status status = AE_OK;
- ACPI_FUNCTION_TRACE("tb_verify_table_checksum");
+ /* Sum the entire table as-is */
- /* Compute the checksum on the table */
+ checksum = acpi_tb_sum_table(table, table->length);
- checksum =
- acpi_tb_generate_checksum(table_header, table_header->length);
+ /* Subtract off the existing checksum value in the table */
- /* Return the appropriate exception */
+ checksum = (u8) (checksum - table->checksum);
- if (checksum) {
- ACPI_WARNING((AE_INFO,
- "Invalid checksum in table [%4.4s] (%02X, sum %02X is not zero)",
- table_header->signature,
- (u32) table_header->checksum, (u32) checksum));
+ /* Compute the final checksum */
- status = AE_BAD_CHECKSUM;
- }
- return_ACPI_STATUS(status);
+ checksum = (u8) (0 - checksum);
+ return (checksum);
}
/*******************************************************************************
*
- * FUNCTION: acpi_tb_generate_checksum
+ * FUNCTION: acpi_tb_set_checksum
*
- * PARAMETERS: Buffer - Buffer to checksum
- * Length - Size of the buffer
+ * PARAMETERS: Table - Pointer to a valid ACPI table (with a
+ * standard ACPI header)
*
- * RETURN: 8 bit checksum of buffer
+ * RETURN: None. Sets the table checksum field
*
- * DESCRIPTION: Computes an 8 bit checksum of the buffer(length) and returns it.
+ * DESCRIPTION: Computes an 8 bit checksum of the table and inserts the
+ * checksum into the table header.
*
******************************************************************************/
-u8 acpi_tb_generate_checksum(void *buffer, u32 length)
+void acpi_tb_set_checksum(struct acpi_table_header *table)
{
- u8 *end_buffer;
- u8 *rover;
- u8 sum = 0;
- if (buffer && length) {
+ table->checksum = acpi_tb_generate_checksum(table);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_verify_table_checksum
+ *
+ * PARAMETERS: *table_header - ACPI table to verify
+ *
+ * RETURN: 8 bit checksum of table
+ *
+ * DESCRIPTION: Generates an 8 bit checksum of table and returns and compares
+ * it to the existing checksum value.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_verify_table_checksum(struct acpi_table_header *table_header)
+{
+ u8 checksum;
+
+ ACPI_FUNCTION_TRACE("tb_verify_table_checksum");
+
+ /* Compute the checksum on the table */
- /* Buffer and Length are valid */
+ checksum = acpi_tb_generate_checksum(table_header);
- end_buffer = ACPI_ADD_PTR(u8, buffer, length);
+ /* Checksum ok? */
- for (rover = buffer; rover < end_buffer; rover++) {
- sum = (u8) (sum + *rover);
- }
+ if (checksum == table_header->checksum) {
+ return_ACPI_STATUS(AE_OK);
}
- return (sum);
+
+ ACPI_WARNING((AE_INFO,
+ "Incorrect checksum in table [%4.4s] - is %2.2X, should be %2.2X",
+ table_header->signature, table_header->checksum,
+ checksum));
+
+ return_ACPI_STATUS(AE_BAD_CHECKSUM);
}
#ifdef ACPI_OBSOLETE_FUNCTIONS
@@ -278,7 +324,7 @@ u8 acpi_tb_generate_checksum(void *buffer, u32 length)
acpi_status
acpi_tb_handle_to_object(u16 table_id,
- struct acpi_table_desc ** return_table_desc)
+ struct acpi_table_desc **return_table_desc)
{
u32 i;
struct acpi_table_desc *table_desc;