tbget.c
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上传日期:2013-04-10
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文件大小:18k
- /******************************************************************************
- *
- * Module Name: tbget - ACPI Table get* routines
- * $Revision: 56 $
- *
- *****************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "achware.h"
- #include "actables.h"
- #define _COMPONENT ACPI_TABLES
- MODULE_NAME ("tbget")
- #define RSDP_CHECKSUM_LENGTH 20
- /*******************************************************************************
- *
- * FUNCTION: Acpi_tb_get_table_ptr
- *
- * PARAMETERS: Table_type - one of the defined table types
- * Instance - Which table of this type
- * Table_ptr_loc - pointer to location to place the pointer for
- * return
- *
- * RETURN: Status
- *
- * DESCRIPTION: This function is called to get the pointer to an ACPI table.
- *
- ******************************************************************************/
- acpi_status
- acpi_tb_get_table_ptr (
- acpi_table_type table_type,
- u32 instance,
- acpi_table_header **table_ptr_loc)
- {
- acpi_table_desc *table_desc;
- u32 i;
- FUNCTION_TRACE ("Tb_get_table_ptr");
- if (!acpi_gbl_DSDT) {
- return_ACPI_STATUS (AE_NO_ACPI_TABLES);
- }
- if (table_type > ACPI_TABLE_MAX) {
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
- /*
- * For all table types (Single/Multiple), the first
- * instance is always in the list head.
- */
- if (instance == 1) {
- /*
- * Just pluck the pointer out of the global table!
- * Will be null if no table is present
- */
- *table_ptr_loc = acpi_gbl_acpi_tables[table_type].pointer;
- return_ACPI_STATUS (AE_OK);
- }
- /*
- * Check for instance out of range
- */
- if (instance > acpi_gbl_acpi_tables[table_type].count) {
- return_ACPI_STATUS (AE_NOT_EXIST);
- }
- /* Walk the list to get the desired table
- * Since the if (Instance == 1) check above checked for the
- * first table, setting Table_desc equal to the .Next member
- * is actually pointing to the second table. Therefore, we
- * need to walk from the 2nd table until we reach the Instance
- * that the user is looking for and return its table pointer.
- */
- table_desc = acpi_gbl_acpi_tables[table_type].next;
- for (i = 2; i < instance; i++) {
- table_desc = table_desc->next;
- }
- /* We are now pointing to the requested table's descriptor */
- *table_ptr_loc = table_desc->pointer;
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_tb_get_table
- *
- * PARAMETERS: Physical_address - Physical address of table to retrieve
- * *Buffer_ptr - If Buffer_ptr is valid, read data from
- * buffer rather than searching memory
- * *Table_info - Where the table info is returned
- *
- * RETURN: Status
- *
- * DESCRIPTION: Maps the physical address of table into a logical address
- *
- ******************************************************************************/
- acpi_status
- acpi_tb_get_table (
- ACPI_PHYSICAL_ADDRESS physical_address,
- acpi_table_header *buffer_ptr,
- acpi_table_desc *table_info)
- {
- acpi_table_header *table_header = NULL;
- acpi_table_header *full_table = NULL;
- u32 size;
- u8 allocation;
- acpi_status status = AE_OK;
- FUNCTION_TRACE ("Tb_get_table");
- if (!table_info) {
- return_ACPI_STATUS (AE_BAD_PARAMETER);
- }
- if (buffer_ptr) {
- /*
- * Getting data from a buffer, not BIOS tables
- */
- table_header = buffer_ptr;
- status = acpi_tb_validate_table_header (table_header);
- if (ACPI_FAILURE (status)) {
- /* Table failed verification, map all errors to BAD_DATA */
- return_ACPI_STATUS (AE_BAD_DATA);
- }
- /* Allocate buffer for the entire table */
- full_table = ACPI_MEM_ALLOCATE (table_header->length);
- if (!full_table) {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- /* Copy the entire table (including header) to the local buffer */
- size = table_header->length;
- MEMCPY (full_table, buffer_ptr, size);
- /* Save allocation type */
- allocation = ACPI_MEM_ALLOCATED;
- }
- /*
- * Not reading from a buffer, just map the table's physical memory
- * into our address space.
- */
- else {
- size = SIZE_IN_HEADER;
- status = acpi_tb_map_acpi_table (physical_address, &size, &full_table);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Save allocation type */
- allocation = ACPI_MEM_MAPPED;
- }
- /* Return values */
- table_info->pointer = full_table;
- table_info->length = size;
- table_info->allocation = allocation;
- table_info->base_pointer = full_table;
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_tb_get_all_tables
- *
- * PARAMETERS: Number_of_tables - Number of tables to get
- * Table_ptr - Input buffer pointer, optional
- *
- * RETURN: Status
- *
- * DESCRIPTION: Load and validate all tables other than the RSDT. The RSDT must
- * already be loaded and validated.
- *
- ******************************************************************************/
- acpi_status
- acpi_tb_get_all_tables (
- u32 number_of_tables,
- acpi_table_header *table_ptr)
- {
- acpi_status status = AE_OK;
- u32 index;
- acpi_table_desc table_info;
- FUNCTION_TRACE ("Tb_get_all_tables");
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Number of tables: %dn", number_of_tables));
- /*
- * Loop through all table pointers found in RSDT.
- * This will NOT include the FACS and DSDT - we must get
- * them after the loop
- */
- for (index = 0; index < number_of_tables; index++) {
- /* Clear the Table_info each time */
- MEMSET (&table_info, 0, sizeof (acpi_table_desc));
- /* Get the table via the XSDT */
- status = acpi_tb_get_table ((ACPI_PHYSICAL_ADDRESS)
- ACPI_GET_ADDRESS (acpi_gbl_XSDT->table_offset_entry[index]),
- table_ptr, &table_info);
- /* Ignore a table that failed verification */
- if (status == AE_BAD_DATA) {
- continue;
- }
- /* However, abort on serious errors */
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Recognize and install the table */
- status = acpi_tb_install_table (table_ptr, &table_info);
- if (ACPI_FAILURE (status)) {
- /*
- * Unrecognized or unsupported table, delete it and ignore the
- * error. Just get as many tables as we can, later we will
- * determine if there are enough tables to continue.
- */
- acpi_tb_uninstall_table (&table_info);
- }
- }
- /*
- * Convert the FADT to a common format. This allows earlier revisions of the
- * table to coexist with newer versions, using common access code.
- */
- status = acpi_tb_convert_table_fadt ();
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /*
- * Get the minimum set of ACPI tables, namely:
- *
- * 1) FADT (via RSDT in loop above)
- * 2) FACS
- * 3) DSDT
- *
- */
- /*
- * Get the FACS (must have the FADT first, from loop above)
- * Acpi_tb_get_table_facs will fail if FADT pointer is not valid
- */
- status = acpi_tb_get_table_facs (table_ptr, &table_info);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Install the FACS */
- status = acpi_tb_install_table (table_ptr, &table_info);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /*
- * Create the common FACS pointer table
- * (Contains pointers to the original table)
- */
- status = acpi_tb_build_common_facs (&table_info);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /*
- * Get the DSDT (We know that the FADT is valid now)
- */
- status = acpi_tb_get_table ((ACPI_PHYSICAL_ADDRESS) ACPI_GET_ADDRESS (acpi_gbl_FADT->Xdsdt),
- table_ptr, &table_info);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Install the DSDT */
- status = acpi_tb_install_table (table_ptr, &table_info);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Dump the DSDT Header */
- ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Hex dump of DSDT Header:n"));
- DUMP_BUFFER ((u8 *) acpi_gbl_DSDT, sizeof (acpi_table_header));
- /* Dump the entire DSDT */
- ACPI_DEBUG_PRINT ((ACPI_DB_TABLES,
- "Hex dump of DSDT (After header), size %d (%x)n",
- acpi_gbl_DSDT->length, acpi_gbl_DSDT->length));
- DUMP_BUFFER ((u8 *) (acpi_gbl_DSDT + 1), acpi_gbl_DSDT->length);
- /*
- * Initialize the capabilities flags.
- * Assumes that platform supports ACPI_MODE since we have tables!
- */
- acpi_gbl_system_flags |= acpi_hw_get_mode_capabilities ();
- /* Always delete the RSDP mapping, we are done with it */
- acpi_tb_delete_acpi_table (ACPI_TABLE_RSDP);
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_tb_verify_rsdp
- *
- * PARAMETERS: Number_of_tables - Where the table count is placed
- *
- * RETURN: Status
- *
- * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
- *
- ******************************************************************************/
- acpi_status
- acpi_tb_verify_rsdp (
- ACPI_PHYSICAL_ADDRESS rsdp_physical_address)
- {
- acpi_table_desc table_info;
- acpi_status status;
- u8 *table_ptr;
- FUNCTION_TRACE ("Tb_verify_rsdp");
- /*
- * Obtain access to the RSDP structure
- */
- status = acpi_os_map_memory (rsdp_physical_address, sizeof (RSDP_DESCRIPTOR),
- (void **) &table_ptr);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /*
- * The signature and checksum must both be correct
- */
- if (STRNCMP ((NATIVE_CHAR *) table_ptr, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
- /* Nope, BAD Signature */
- status = AE_BAD_SIGNATURE;
- goto cleanup;
- }
- if (acpi_tb_checksum (table_ptr, RSDP_CHECKSUM_LENGTH) != 0) {
- /* Nope, BAD Checksum */
- status = AE_BAD_CHECKSUM;
- goto cleanup;
- }
- /* TBD: Check extended checksum if table version >= 2 */
- /* The RSDP supplied is OK */
- table_info.pointer = (acpi_table_header *) table_ptr;
- table_info.length = sizeof (RSDP_DESCRIPTOR);
- table_info.allocation = ACPI_MEM_MAPPED;
- table_info.base_pointer = table_ptr;
- /* Save the table pointers and allocation info */
- status = acpi_tb_init_table_descriptor (ACPI_TABLE_RSDP, &table_info);
- if (ACPI_FAILURE (status)) {
- goto cleanup;
- }
- /* Save the RSDP in a global for easy access */
- acpi_gbl_RSDP = (RSDP_DESCRIPTOR *) table_info.pointer;
- return_ACPI_STATUS (status);
- /* Error exit */
- cleanup:
- acpi_os_unmap_memory (table_ptr, sizeof (RSDP_DESCRIPTOR));
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_tb_get_rsdt_address
- *
- * PARAMETERS: None
- *
- * RETURN: RSDT physical address
- *
- * DESCRIPTION: Extract the address of the RSDT or XSDT, depending on the
- * version of the RSDP
- *
- ******************************************************************************/
- ACPI_PHYSICAL_ADDRESS
- acpi_tb_get_rsdt_address (void)
- {
- ACPI_PHYSICAL_ADDRESS physical_address;
- FUNCTION_ENTRY ();
- /*
- * For RSDP revision 0 or 1, we use the RSDT.
- * For RSDP revision 2 (and above), we use the XSDT
- */
- if (acpi_gbl_RSDP->revision < 2) {
- #ifdef _IA64
- /* 0.71 RSDP has 64bit Rsdt address field */
- physical_address = ((RSDP_DESCRIPTOR_REV071 *)acpi_gbl_RSDP)->rsdt_physical_address;
- #else
- physical_address = (ACPI_PHYSICAL_ADDRESS) acpi_gbl_RSDP->rsdt_physical_address;
- #endif
- }
- else {
- physical_address = (ACPI_PHYSICAL_ADDRESS)
- ACPI_GET_ADDRESS (acpi_gbl_RSDP->xsdt_physical_address);
- }
- return (physical_address);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_tb_validate_rsdt
- *
- * PARAMETERS: Table_ptr - Addressable pointer to the RSDT.
- *
- * RETURN: Status
- *
- * DESCRIPTION: Validate signature for the RSDT or XSDT
- *
- ******************************************************************************/
- acpi_status
- acpi_tb_validate_rsdt (
- acpi_table_header *table_ptr)
- {
- u32 no_match;
- PROC_NAME ("Tb_validate_rsdt");
- /*
- * For RSDP revision 0 or 1, we use the RSDT.
- * For RSDP revision 2 (and above), we use the XSDT
- */
- if (acpi_gbl_RSDP->revision < 2) {
- no_match = STRNCMP ((char *) table_ptr, RSDT_SIG,
- sizeof (RSDT_SIG) -1);
- }
- else {
- no_match = STRNCMP ((char *) table_ptr, XSDT_SIG,
- sizeof (XSDT_SIG) -1);
- }
- if (no_match) {
- /* Invalid RSDT or XSDT signature */
- REPORT_ERROR (("Invalid signature where RSDP indicates RSDT/XSDT should be locatedn"));
- DUMP_BUFFER (acpi_gbl_RSDP, 20);
- ACPI_DEBUG_PRINT_RAW ((ACPI_DB_ERROR,
- "RSDT/XSDT signature at %X is invalidn",
- acpi_gbl_RSDP->rsdt_physical_address));
- return (AE_BAD_SIGNATURE);
- }
- return (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_tb_get_table_pointer
- *
- * PARAMETERS: Physical_address - Address from RSDT
- * Flags - virtual or physical addressing
- * Table_ptr - Addressable address (output)
- *
- * RETURN: Status
- *
- * DESCRIPTION: Create an addressable pointer to an ACPI table
- *
- ******************************************************************************/
- acpi_status
- acpi_tb_get_table_pointer (
- ACPI_PHYSICAL_ADDRESS physical_address,
- u32 flags,
- u32 *size,
- acpi_table_header **table_ptr)
- {
- acpi_status status;
- FUNCTION_ENTRY ();
- if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) {
- *size = SIZE_IN_HEADER;
- status = acpi_tb_map_acpi_table (physical_address, size, table_ptr);
- }
- else {
- *size = 0;
- *table_ptr = (acpi_table_header *) (ACPI_TBLPTR) physical_address;
- status = AE_OK;
- }
- return (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_tb_get_table_rsdt
- *
- * PARAMETERS: Number_of_tables - Where the table count is placed
- *
- * RETURN: Status
- *
- * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
- *
- ******************************************************************************/
- acpi_status
- acpi_tb_get_table_rsdt (
- u32 *number_of_tables)
- {
- acpi_table_desc table_info;
- acpi_status status;
- ACPI_PHYSICAL_ADDRESS physical_address;
- FUNCTION_TRACE ("Tb_get_table_rsdt");
- /*
- * Get the RSDT from the RSDP
- */
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "RSDP located at %p, RSDT physical=%8.8X%8.8X n",
- acpi_gbl_RSDP, HIDWORD(acpi_gbl_RSDP->rsdt_physical_address),
- LODWORD(acpi_gbl_RSDP->rsdt_physical_address)));
- physical_address = acpi_tb_get_rsdt_address ();
- /* Get the RSDT/XSDT */
- status = acpi_tb_get_table (physical_address, NULL, &table_info);
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not get the RSDT, %sn",
- acpi_format_exception (status)));
- return_ACPI_STATUS (status);
- }
- /* Check the RSDT or XSDT signature */
- status = acpi_tb_validate_rsdt (table_info.pointer);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /*
- * Valid RSDT signature, verify the checksum. If it fails, just
- * print a warning and ignore it.
- */
- status = acpi_tb_verify_table_checksum (table_info.pointer);
- /* Convert and/or copy to an XSDT structure */
- status = acpi_tb_convert_to_xsdt (&table_info, number_of_tables);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Save the table pointers and allocation info */
- status = acpi_tb_init_table_descriptor (ACPI_TABLE_XSDT, &table_info);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- acpi_gbl_XSDT = (xsdt_descriptor *) table_info.pointer;
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "XSDT located at %pn", acpi_gbl_XSDT));
- return_ACPI_STATUS (status);
- }
- /******************************************************************************
- *
- * FUNCTION: Acpi_tb_get_table_facs
- *
- * PARAMETERS: *Buffer_ptr - If Buffer_ptr is valid, read data from
- * buffer rather than searching memory
- * *Table_info - Where the table info is returned
- *
- * RETURN: Status
- *
- * DESCRIPTION: Returns a pointer to the FACS as defined in FADT. This
- * function assumes the global variable FADT has been
- * correctly initialized. The value of FADT->Firmware_ctrl
- * into a far pointer which is returned.
- *
- *****************************************************************************/
- acpi_status
- acpi_tb_get_table_facs (
- acpi_table_header *buffer_ptr,
- acpi_table_desc *table_info)
- {
- acpi_table_header *table_ptr = NULL;
- u32 size;
- u8 allocation;
- acpi_status status = AE_OK;
- FUNCTION_TRACE ("Tb_get_table_facs");
- /* Must have a valid FADT pointer */
- if (!acpi_gbl_FADT) {
- return_ACPI_STATUS (AE_NO_ACPI_TABLES);
- }
- size = sizeof (FACS_DESCRIPTOR);
- if (buffer_ptr) {
- /*
- * Getting table from a file -- allocate a buffer and
- * read the table.
- */
- table_ptr = ACPI_MEM_ALLOCATE (size);
- if(!table_ptr) {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- MEMCPY (table_ptr, buffer_ptr, size);
- /* Save allocation type */
- allocation = ACPI_MEM_ALLOCATED;
- }
- else {
- /* Just map the physical memory to our address space */
- status = acpi_tb_map_acpi_table ((ACPI_PHYSICAL_ADDRESS) ACPI_GET_ADDRESS (acpi_gbl_FADT->Xfirmware_ctrl),
- &size, &table_ptr);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Save allocation type */
- allocation = ACPI_MEM_MAPPED;
- }
- /* Return values */
- table_info->pointer = table_ptr;
- table_info->length = size;
- table_info->allocation = allocation;
- table_info->base_pointer = table_ptr;
- return_ACPI_STATUS (status);
- }