/******************************************************************************
*
- * Module Name: tbutils - Table manipulation utilities
+ * Module Name: tbutils - table utilities
*
*****************************************************************************/
/*
- * 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
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);
-#endif
+static acpi_physical_address
+acpi_tb_get_root_table_entry(u8 * table_entry,
+ acpi_native_uint table_entry_size);
/*******************************************************************************
*
- * FUNCTION: acpi_tb_is_table_installed
- *
- * PARAMETERS: new_table_desc - Descriptor for new table being installed
+ * FUNCTION: acpi_tb_print_table_header
*
- * RETURN: Status - AE_ALREADY_EXISTS if the table is already installed
+ * PARAMETERS: Address - Table physical address
+ * Header - Table header
*
- * DESCRIPTION: Determine if an ACPI table is already installed
+ * RETURN: None
*
- * MUTEX: Table data structures should be locked
+ * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
*
******************************************************************************/
-acpi_status acpi_tb_is_table_installed(struct acpi_table_desc *new_table_desc)
+void
+acpi_tb_print_table_header(acpi_physical_address address,
+ struct acpi_table_header *header)
{
- struct acpi_table_desc *table_desc;
- ACPI_FUNCTION_TRACE("tb_is_table_installed");
+ if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
+
+ /* FACS only has signature and length fields of common table header */
+
+ ACPI_INFO((AE_INFO, "%4.4s @ 0x%p/0x%04X",
+ header->signature, ACPI_CAST_PTR(void, address),
+ header->length));
+ } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
+
+ /* RSDP has no common fields */
+
+ ACPI_INFO((AE_INFO, "RSDP @ 0x%p/0x%04X (v%3.3d %6.6s)",
+ ACPI_CAST_PTR(void, address),
+ (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
+ revision >
+ 0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
+ header)->length : 20,
+ ACPI_CAST_PTR(struct acpi_table_rsdp,
+ header)->revision,
+ ACPI_CAST_PTR(struct acpi_table_rsdp,
+ header)->oem_id));
+ } else {
+ /* Standard ACPI table with full common header */
+
+ ACPI_INFO((AE_INFO,
+ "%4.4s @ 0x%p/0x%04X (v%3.3d %6.6s %8.8s 0x%08X %4.4s 0x%08X)",
+ header->signature, ACPI_CAST_PTR(void, address),
+ header->length, header->revision, header->oem_id,
+ header->oem_table_id, header->oem_revision,
+ header->asl_compiler_id,
+ header->asl_compiler_revision));
+ }
+}
- /* Get the list descriptor and first table descriptor */
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_validate_checksum
+ *
+ * PARAMETERS: Table - ACPI table to verify
+ * Length - Length of entire table
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
+ * exception on bad checksum.
+ *
+ ******************************************************************************/
- table_desc = acpi_gbl_table_lists[new_table_desc->type].next;
+acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
+{
+ u8 checksum;
- /* Examine all installed tables of this type */
+ /* Compute the checksum on the table */
- 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 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);
- }
+ checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
+
+ /* Checksum ok? (should be zero) */
+
+ if (checksum) {
+ ACPI_WARNING((AE_INFO,
+ "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X",
+ table->signature, table->checksum,
+ (u8) (table->checksum - checksum)));
- /* Get next table on the list */
+#if (ACPI_CHECKSUM_ABORT)
- table_desc = table_desc->next;
+ return (AE_BAD_CHECKSUM);
+#endif
}
- return_ACPI_STATUS(AE_OK);
+ return (AE_OK);
}
/*******************************************************************************
*
- * FUNCTION: acpi_tb_validate_table_header
+ * FUNCTION: acpi_tb_checksum
*
- * PARAMETERS: table_header - Logical pointer to the table
+ * PARAMETERS: Buffer - Pointer to memory region to be checked
+ * Length - Length of this memory region
*
- * RETURN: Status
- *
- * DESCRIPTION: Check an ACPI table header for validity
+ * RETURN: Checksum (u8)
*
- * NOTE: Table pointers are validated as follows:
- * 1) Table pointer must point to valid physical memory
- * 2) Signature must be 4 ASCII chars, even if we don't recognize the
- * name
- * 3) Table must be readable for length specified in the header
- * 4) Table checksum must be valid (with the exception of the FACS
- * which has no checksum because it contains variable fields)
+ * DESCRIPTION: Calculates circular checksum of memory region.
*
******************************************************************************/
-acpi_status
-acpi_tb_validate_table_header(struct acpi_table_header *table_header)
+u8 acpi_tb_checksum(u8 * buffer, acpi_native_uint length)
{
- acpi_name signature;
+ u8 sum = 0;
+ u8 *end = buffer + length;
- ACPI_FUNCTION_NAME("tb_validate_table_header");
+ while (buffer < end) {
+ sum = (u8) (sum + *(buffer++));
+ }
+
+ return sum;
+}
- /* Verify that this is a valid address */
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_install_table
+ *
+ * PARAMETERS: Address - Physical address of DSDT or FACS
+ * Flags - Flags
+ * Signature - Table signature, NULL if no need to
+ * match
+ * table_index - Index into root table array
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Install an ACPI table into the global data structure.
+ *
+ ******************************************************************************/
- 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));
+void
+acpi_tb_install_table(acpi_physical_address address,
+ u8 flags, char *signature, acpi_native_uint table_index)
+{
+ struct acpi_table_header *table;
- return (AE_BAD_ADDRESS);
+ if (!address) {
+ ACPI_ERROR((AE_INFO,
+ "Null physical address for ACPI table [%s]",
+ signature));
+ return;
}
- /* Ensure that the signature is 4 ASCII characters */
+ /* Map just the table header */
- 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));
+ table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+ if (!table) {
+ return;
+ }
- ACPI_REPORT_WARNING(("Invalid table signature found: [%4.4s]\n",
- (char *)&signature));
+ /* If a particular signature is expected, signature must match */
- ACPI_DUMP_BUFFER(table_header,
- sizeof(struct acpi_table_header));
- return (AE_BAD_SIGNATURE);
+ if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
+ ACPI_ERROR((AE_INFO,
+ "Invalid signature 0x%X for ACPI table [%s]",
+ *ACPI_CAST_PTR(u32, table->signature), signature));
+ goto unmap_and_exit;
}
- /* Validate the table length */
+ /* Initialize the table entry */
+
+ acpi_gbl_root_table_list.tables[table_index].address = address;
+ acpi_gbl_root_table_list.tables[table_index].length = table->length;
+ acpi_gbl_root_table_list.tables[table_index].flags = flags;
+
+ ACPI_MOVE_32_TO_32(&
+ (acpi_gbl_root_table_list.tables[table_index].
+ signature), table->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_tb_print_table_header(address, table);
- ACPI_REPORT_WARNING(("Invalid table header length (0x%X) found\n", (u32) table_header->length));
+ if (table_index == ACPI_TABLE_INDEX_DSDT) {
- ACPI_DUMP_BUFFER(table_header,
- sizeof(struct acpi_table_header));
- return (AE_BAD_HEADER);
+ /* Global integer width is based upon revision of the DSDT */
+
+ acpi_ut_set_integer_width(table->revision);
}
- return (AE_OK);
+ unmap_and_exit:
+ acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
}
/*******************************************************************************
*
- * FUNCTION: acpi_tb_verify_table_checksum
+ * FUNCTION: acpi_tb_get_root_table_entry
*
- * PARAMETERS: *table_header - ACPI table to verify
+ * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
+ * table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
*
- * RETURN: 8 bit checksum of table
+ * RETURN: Physical address extracted from the root table
*
- * DESCRIPTION: Does an 8 bit checksum of table and returns status. A correct
- * table should have a checksum of 0.
+ * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
+ * both 32-bit and 64-bit platforms
+ *
+ * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
+ * 64-bit platforms.
*
******************************************************************************/
-acpi_status
-acpi_tb_verify_table_checksum(struct acpi_table_header * table_header)
+static acpi_physical_address
+acpi_tb_get_root_table_entry(u8 * table_entry,
+ acpi_native_uint table_entry_size)
{
- u8 checksum;
- acpi_status status = AE_OK;
-
- ACPI_FUNCTION_TRACE("tb_verify_table_checksum");
-
- /* Compute the checksum on the table */
+ u64 address64;
- checksum =
- acpi_tb_generate_checksum(table_header, table_header->length);
+ /*
+ * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
+ * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
+ */
+ if (table_entry_size == sizeof(u32)) {
+ /*
+ * 32-bit platform, RSDT: Return 32-bit table entry
+ * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
+ */
+ return ((acpi_physical_address)
+ (*ACPI_CAST_PTR(u32, table_entry)));
+ } else {
+ /*
+ * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
+ * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, return 64-bit
+ */
+ ACPI_MOVE_64_TO_64(&address64, table_entry);
- /* Return the appropriate exception */
+#if ACPI_MACHINE_WIDTH == 32
+ if (address64 > ACPI_UINT32_MAX) {
- 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));
+ /* Will truncate 64-bit address to 32 bits, issue warning */
- status = AE_BAD_CHECKSUM;
+ ACPI_WARNING((AE_INFO,
+ "64-bit Physical Address in XSDT is too large (%8.8X%8.8X), truncating",
+ ACPI_FORMAT_UINT64(address64)));
+ }
+#endif
+ return ((acpi_physical_address) (address64));
}
- return_ACPI_STATUS(status);
}
/*******************************************************************************
*
- * FUNCTION: acpi_tb_generate_checksum
+ * FUNCTION: acpi_tb_parse_root_table
+ *
+ * PARAMETERS: Rsdp - Pointer to the RSDP
+ * Flags - Flags
*
- * PARAMETERS: Buffer - Buffer to checksum
- * Length - Size of the buffer
+ * RETURN: Status
*
- * RETURN: 8 bit checksum of buffer
+ * DESCRIPTION: This function is called to parse the Root System Description
+ * Table (RSDT or XSDT)
*
- * DESCRIPTION: Computes an 8 bit checksum of the buffer(length) and returns it.
+ * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
+ * be mapped and cannot be copied because it contains the actual
+ * memory location of the ACPI Global Lock.
*
******************************************************************************/
-u8 acpi_tb_generate_checksum(void *buffer, u32 length)
+acpi_status __init
+acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
{
- u8 *end_buffer;
- u8 *rover;
- u8 sum = 0;
+ struct acpi_table_rsdp *rsdp;
+ acpi_native_uint table_entry_size;
+ acpi_native_uint i;
+ u32 table_count;
+ struct acpi_table_header *table;
+ acpi_physical_address address;
+ u32 length;
+ u8 *table_entry;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(tb_parse_root_table);
+
+ /*
+ * Map the entire RSDP and extract the address of the RSDT or XSDT
+ */
+ rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
+ if (!rsdp) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ acpi_tb_print_table_header(rsdp_address,
+ ACPI_CAST_PTR(struct acpi_table_header,
+ rsdp));
+
+ /* Differentiate between RSDT and XSDT root tables */
- if (buffer && length) {
- /* Buffer and Length are valid */
+ if (rsdp->revision > 1 && rsdp->xsdt_physical_address) {
+ /*
+ * Root table is an XSDT (64-bit physical addresses). We must use the
+ * XSDT if the revision is > 1 and the XSDT pointer is present, as per
+ * the ACPI specification.
+ */
+ address = (acpi_physical_address) rsdp->xsdt_physical_address;
+ table_entry_size = sizeof(u64);
+ } else {
+ /* Root table is an RSDT (32-bit physical addresses) */
+
+ address = (acpi_physical_address) rsdp->rsdt_physical_address;
+ table_entry_size = sizeof(u32);
+ }
- end_buffer = ACPI_ADD_PTR(u8, buffer, length);
+ /*
+ * It is not possible to map more than one entry in some environments,
+ * so unmap the RSDP here before mapping other tables
+ */
+ acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
+
+ /* Map the RSDT/XSDT table header to get the full table length */
+
+ table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+ if (!table) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
- for (rover = buffer; rover < end_buffer; rover++) {
- sum = (u8) (sum + *rover);
+ acpi_tb_print_table_header(address, table);
+
+ /* Get the length of the full table, verify length and map entire table */
+
+ length = table->length;
+ acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+
+ if (length < sizeof(struct acpi_table_header)) {
+ ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
+ length));
+ return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
+ }
+
+ table = acpi_os_map_memory(address, length);
+ if (!table) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /* Validate the root table checksum */
+
+ status = acpi_tb_verify_checksum(table, length);
+ if (ACPI_FAILURE(status)) {
+ acpi_os_unmap_memory(table, length);
+ return_ACPI_STATUS(status);
+ }
+
+ /* Calculate the number of tables described in the root table */
+
+ table_count =
+ (u32) ((table->length -
+ sizeof(struct acpi_table_header)) / table_entry_size);
+
+ /*
+ * First two entries in the table array are reserved for the DSDT and FACS,
+ * which are not actually present in the RSDT/XSDT - they come from the FADT
+ */
+ table_entry =
+ ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
+ acpi_gbl_root_table_list.count = 2;
+
+ /*
+ * Initialize the root table array from the RSDT/XSDT
+ */
+ for (i = 0; i < table_count; i++) {
+ if (acpi_gbl_root_table_list.count >=
+ acpi_gbl_root_table_list.size) {
+
+ /* There is no more room in the root table array, attempt resize */
+
+ status = acpi_tb_resize_root_table_list();
+ if (ACPI_FAILURE(status)) {
+ ACPI_WARNING((AE_INFO,
+ "Truncating %u table entries!",
+ (unsigned)
+ (acpi_gbl_root_table_list.size -
+ acpi_gbl_root_table_list.
+ count)));
+ break;
+ }
+ }
+
+ /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
+
+ acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
+ address =
+ acpi_tb_get_root_table_entry(table_entry, table_entry_size);
+
+ table_entry += table_entry_size;
+ acpi_gbl_root_table_list.count++;
+ }
+
+ /*
+ * It is not possible to map more than one entry in some environments,
+ * so unmap the root table here before mapping other tables
+ */
+ acpi_os_unmap_memory(table, length);
+
+ /*
+ * Complete the initialization of the root table array by examining
+ * the header of each table
+ */
+ for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
+ acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
+ address, flags, NULL, i);
+
+ /* Special case for FADT - get the DSDT and FACS */
+
+ if (ACPI_COMPARE_NAME
+ (&acpi_gbl_root_table_list.tables[i].signature,
+ ACPI_SIG_FADT)) {
+ acpi_tb_parse_fadt(i, flags);
}
}
- return (sum);
+
+ return_ACPI_STATUS(AE_OK);
}
-#ifdef ACPI_OBSOLETE_FUNCTIONS
-/*******************************************************************************
+/******************************************************************************
*
- * FUNCTION: acpi_tb_handle_to_object
+ * FUNCTION: acpi_tb_map
*
- * PARAMETERS: table_id - Id for which the function is searching
- * table_desc - Pointer to return the matching table
- * descriptor.
+ * PARAMETERS: Address - Address to be mapped
+ * Length - Length to be mapped
+ * Flags - Logical or physical addressing mode
*
- * RETURN: Search the tables to find one with a matching table_id and
- * return a pointer to that table descriptor.
+ * RETURN: Pointer to mapped region
*
- ******************************************************************************/
+ * DESCRIPTION: Maps memory according to flag
+ *
+ *****************************************************************************/
-acpi_status
-acpi_tb_handle_to_object(u16 table_id,
- struct acpi_table_desc ** return_table_desc)
+void *acpi_tb_map(acpi_physical_address address, u32 length, u32 flags)
{
- u32 i;
- struct acpi_table_desc *table_desc;
- ACPI_FUNCTION_NAME("tb_handle_to_object");
+ if (flags == ACPI_TABLE_ORIGIN_MAPPED) {
+ return (acpi_os_map_memory(address, length));
+ } else {
+ return (ACPI_CAST_PTR(void, address));
+ }
+}
+
+/******************************************************************************
+ *
+ * FUNCTION: acpi_tb_unmap
+ *
+ * PARAMETERS: Pointer - To mapped region
+ * Length - Length to be unmapped
+ * Flags - Logical or physical addressing mode
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Unmaps memory according to flag
+ *
+ *****************************************************************************/
- for (i = 0; i < ACPI_TABLE_MAX; i++) {
- table_desc = acpi_gbl_table_lists[i].next;
- while (table_desc) {
- if (table_desc->table_id == table_id) {
- *return_table_desc = table_desc;
- return (AE_OK);
- }
+void acpi_tb_unmap(void *pointer, u32 length, u32 flags)
+{
- table_desc = table_desc->next;
- }
+ if (flags == ACPI_TABLE_ORIGIN_MAPPED) {
+ acpi_os_unmap_memory(pointer, length);
}
-
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "table_id=%X does not exist\n",
- table_id));
- return (AE_BAD_PARAMETER);
}
-#endif
git.samba.org / sfrench / cifs-2.6.git / blobdiff