*****************************************************************************/
/*
- * Copyright (C) 2000 - 2005, R. Byron Moore
+ * Copyright (C) 2000 - 2006, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* 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
+ (table_desc->pointer, new_table_desc->pointer,
+ new_table_desc->pointer->length))) {
+
+ /* Match: this table is already installed */
+
+ ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
+ "Table [%4.4s] already installed: Rev %X OemTableId [%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);
+}
/*******************************************************************************
*
******************************************************************************/
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_ENTRY();
/* 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_ERROR((AE_INFO,
+ "Cannot read table header at %p", 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_REPORT_WARNING (("Invalid table signature found: [%4.4s]\n",
- (char *) &signature));
+ ACPI_MOVE_32_TO_32(&signature, table_header->signature);
+ if (!acpi_ut_valid_acpi_name(signature)) {
+ ACPI_ERROR((AE_INFO, "Invalid table signature 0x%8.8X",
+ 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_ERROR((AE_INFO,
+ "Invalid length 0x%X in table with signature %4.4s",
+ (u32) table_header->length,
+ ACPI_CAST_PTR(char, &signature)));
- 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
+ * 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)
{
- u8 checksum;
- acpi_status status = AE_OK;
+ 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.
+ *
+ ******************************************************************************/
- ACPI_FUNCTION_TRACE ("tb_verify_table_checksum");
+u8 acpi_tb_generate_checksum(struct acpi_table_header * table)
+{
+ u8 checksum;
+ /* Sum the entire table as-is */
- /* Compute the checksum on the table */
+ checksum = acpi_tb_sum_table(table, table->length);
- checksum = acpi_tb_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_REPORT_WARNING ((
- "Invalid checksum in table [%4.4s] (%02X, sum %02X is not zero)\n",
- 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_set_checksum
+ *
+ * PARAMETERS: Table - Pointer to a valid ACPI table (with a
+ * standard ACPI header)
+ *
+ * RETURN: None. Sets the table checksum field
+ *
+ * DESCRIPTION: Computes an 8 bit checksum of the table and inserts the
+ * checksum into the table header.
+ *
+ ******************************************************************************/
+
+void acpi_tb_set_checksum(struct acpi_table_header *table)
+{
+
+ table->checksum = acpi_tb_generate_checksum(table);
+}
/*******************************************************************************
*
- * FUNCTION: acpi_tb_checksum
+ * FUNCTION: acpi_tb_verify_table_checksum
*
- * PARAMETERS: Buffer - Buffer to checksum
- * Length - Size of the buffer
+ * PARAMETERS: *table_header - ACPI table to verify
*
- * RETURN: 8 bit checksum of buffer
+ * RETURN: 8 bit checksum of table
*
- * DESCRIPTION: Computes an 8 bit checksum of the buffer(length) and returns it.
+ * DESCRIPTION: Generates an 8 bit checksum of table and returns and compares
+ * it to the existing checksum value.
*
******************************************************************************/
-u8
-acpi_tb_checksum (
- void *buffer,
- u32 length)
+acpi_status
+acpi_tb_verify_table_checksum(struct acpi_table_header *table_header)
{
- const u8 *limit;
- const u8 *rover;
- u8 sum = 0;
+ u8 checksum;
+ ACPI_FUNCTION_TRACE(tb_verify_table_checksum);
- if (buffer && length) {
- /* Buffer and Length are valid */
+ /* Compute the checksum on the table */
- limit = (u8 *) buffer + length;
+ checksum = acpi_tb_generate_checksum(table_header);
- for (rover = buffer; rover < limit; rover++) {
- sum = (u8) (sum + *rover);
- }
+ /* Checksum ok? */
+
+ 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
/*******************************************************************************
******************************************************************************/
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;
}
}
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "table_id=%X does not exist\n", table_id));
+ ACPI_ERROR((AE_INFO, "TableId=%X does not exist", table_id));
return (AE_BAD_PARAMETER);
}
#endif
-
-
git.openpandora.org / pandora-kernel.git / blobdiff