diff options
Diffstat (limited to 'drivers/acpi/tables/tbget.c')
| -rw-r--r-- | drivers/acpi/tables/tbget.c | 493 |
1 files changed, 493 insertions, 0 deletions
diff --git a/drivers/acpi/tables/tbget.c b/drivers/acpi/tables/tbget.c new file mode 100644 index 00000000000..896f3ddda62 --- /dev/null +++ b/drivers/acpi/tables/tbget.c @@ -0,0 +1,493 @@ +/****************************************************************************** + * + * Module Name: tbget - ACPI Table get* routines + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + + +#include <acpi/acpi.h> +#include <acpi/actables.h> + + +#define _COMPONENT ACPI_TABLES + ACPI_MODULE_NAME ("tbget") + + +/******************************************************************************* + * + * FUNCTION: acpi_tb_get_table + * + * PARAMETERS: Address - Address of table to retrieve. Can be + * Logical or Physical + * table_info - Where table info is returned + * + * RETURN: None + * + * DESCRIPTION: Get entire table of unknown size. + * + ******************************************************************************/ + +acpi_status +acpi_tb_get_table ( + struct acpi_pointer *address, + struct acpi_table_desc *table_info) +{ + acpi_status status; + struct acpi_table_header header; + + + ACPI_FUNCTION_TRACE ("tb_get_table"); + + + /* + * Get the header in order to get signature and table size + */ + status = acpi_tb_get_table_header (address, &header); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* Get the entire table */ + + status = acpi_tb_get_table_body (address, &header, table_info); + if (ACPI_FAILURE (status)) { + ACPI_REPORT_ERROR (("Could not get ACPI table (size %X), %s\n", + header.length, acpi_format_exception (status))); + return_ACPI_STATUS (status); + } + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_tb_get_table_header + * + * PARAMETERS: Address - Address of table to retrieve. Can be + * Logical or Physical + * return_header - Where the table header is returned + * + * RETURN: Status + * + * DESCRIPTION: Get an ACPI table header. Works in both physical or virtual + * addressing mode. Works with both physical or logical pointers. + * Table is either copied or mapped, depending on the pointer + * type and mode of the processor. + * + ******************************************************************************/ + +acpi_status +acpi_tb_get_table_header ( + struct acpi_pointer *address, + struct acpi_table_header *return_header) +{ + acpi_status status = AE_OK; + struct acpi_table_header *header = NULL; + + + ACPI_FUNCTION_TRACE ("tb_get_table_header"); + + + /* + * Flags contains the current processor mode (Virtual or Physical addressing) + * The pointer_type is either Logical or Physical + */ + switch (address->pointer_type) { + case ACPI_PHYSMODE_PHYSPTR: + case ACPI_LOGMODE_LOGPTR: + + /* Pointer matches processor mode, copy the header */ + + ACPI_MEMCPY (return_header, address->pointer.logical, sizeof (struct acpi_table_header)); + break; + + + case ACPI_LOGMODE_PHYSPTR: + + /* Create a logical address for the physical pointer*/ + + status = acpi_os_map_memory (address->pointer.physical, sizeof (struct acpi_table_header), + (void *) &header); + if (ACPI_FAILURE (status)) { + ACPI_REPORT_ERROR (("Could not map memory at %8.8X%8.8X for length %X\n", + ACPI_FORMAT_UINT64 (address->pointer.physical), + sizeof (struct acpi_table_header))); + return_ACPI_STATUS (status); + } + + /* Copy header and delete mapping */ + + ACPI_MEMCPY (return_header, header, sizeof (struct acpi_table_header)); + acpi_os_unmap_memory (header, sizeof (struct acpi_table_header)); + break; + + + default: + + ACPI_REPORT_ERROR (("Invalid address flags %X\n", + address->pointer_type)); + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Table Signature: [%4.4s]\n", + return_header->signature)); + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_tb_get_table_body + * + * PARAMETERS: Address - Address of table to retrieve. Can be + * Logical or Physical + * Header - Header of the table to retrieve + * table_info - Where the table info is returned + * + * RETURN: Status + * + * DESCRIPTION: Get an entire ACPI table with support to allow the host OS to + * replace the table with a newer version (table override.) + * Works in both physical or virtual + * addressing mode. Works with both physical or logical pointers. + * Table is either copied or mapped, depending on the pointer + * type and mode of the processor. + * + ******************************************************************************/ + +acpi_status +acpi_tb_get_table_body ( + struct acpi_pointer *address, + struct acpi_table_header *header, + struct acpi_table_desc *table_info) +{ + acpi_status status; + + + ACPI_FUNCTION_TRACE ("tb_get_table_body"); + + + if (!table_info || !address) { + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + /* + * Attempt table override. + */ + status = acpi_tb_table_override (header, table_info); + if (ACPI_SUCCESS (status)) { + /* Table was overridden by the host OS */ + + return_ACPI_STATUS (status); + } + + /* No override, get the original table */ + + status = acpi_tb_get_this_table (address, header, table_info); + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_tb_table_override + * + * PARAMETERS: Header - Pointer to table header + * table_info - Return info if table is overridden + * + * RETURN: None + * + * DESCRIPTION: Attempts override of current table with a new one if provided + * by the host OS. + * + ******************************************************************************/ + +acpi_status +acpi_tb_table_override ( + struct acpi_table_header *header, + struct acpi_table_desc *table_info) +{ + struct acpi_table_header *new_table; + acpi_status status; + struct acpi_pointer address; + + + ACPI_FUNCTION_TRACE ("tb_table_override"); + + + /* + * The OSL will examine the header and decide whether to override this + * table. If it decides to override, a table will be returned in new_table, + * which we will then copy. + */ + status = acpi_os_table_override (header, &new_table); + if (ACPI_FAILURE (status)) { + /* Some severe error from the OSL, but we basically ignore it */ + + ACPI_REPORT_ERROR (("Could not override ACPI table, %s\n", + acpi_format_exception (status))); + return_ACPI_STATUS (status); + } + + if (!new_table) { + /* No table override */ + + return_ACPI_STATUS (AE_NO_ACPI_TABLES); + } + + /* + * We have a new table to override the old one. Get a copy of + * the new one. We know that the new table has a logical pointer. + */ + address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING; + address.pointer.logical = new_table; + + status = acpi_tb_get_this_table (&address, new_table, table_info); + if (ACPI_FAILURE (status)) { + ACPI_REPORT_ERROR (("Could not copy override ACPI table, %s\n", + acpi_format_exception (status))); + return_ACPI_STATUS (status); + } + + /* Copy the table info */ + + ACPI_REPORT_INFO (("Table [%4.4s] replaced by host OS\n", + table_info->pointer->signature)); + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_tb_get_this_table + * + * PARAMETERS: Address - Address of table to retrieve. Can be + * Logical or Physical + * Header - Header of the table to retrieve + * table_info - Where the table info is returned + * + * RETURN: Status + * + * DESCRIPTION: Get an entire ACPI table. Works in both physical or virtual + * addressing mode. Works with both physical or logical pointers. + * Table is either copied or mapped, depending on the pointer + * type and mode of the processor. + * + ******************************************************************************/ + +acpi_status +acpi_tb_get_this_table ( + struct acpi_pointer *address, + struct acpi_table_header *header, + struct acpi_table_desc *table_info) +{ + struct acpi_table_header *full_table = NULL; + u8 allocation; + acpi_status status = AE_OK; + + + ACPI_FUNCTION_TRACE ("tb_get_this_table"); + + + /* + * Flags contains the current processor mode (Virtual or Physical addressing) + * The pointer_type is either Logical or Physical + */ + switch (address->pointer_type) { + case ACPI_PHYSMODE_PHYSPTR: + case ACPI_LOGMODE_LOGPTR: + + /* Pointer matches processor mode, copy the table to a new buffer */ + + full_table = ACPI_MEM_ALLOCATE (header->length); + if (!full_table) { + ACPI_REPORT_ERROR (("Could not allocate table memory for [%4.4s] length %X\n", + header->signature, header->length)); + return_ACPI_STATUS (AE_NO_MEMORY); + } + + /* Copy the entire table (including header) to the local buffer */ + + ACPI_MEMCPY (full_table, address->pointer.logical, header->length); + + /* Save allocation type */ + + allocation = ACPI_MEM_ALLOCATED; + break; + + + case ACPI_LOGMODE_PHYSPTR: + + /* + * Just map the table's physical memory + * into our address space. + */ + status = acpi_os_map_memory (address->pointer.physical, (acpi_size) header->length, + (void *) &full_table); + if (ACPI_FAILURE (status)) { + ACPI_REPORT_ERROR (("Could not map memory for table [%4.4s] at %8.8X%8.8X for length %X\n", + header->signature, + ACPI_FORMAT_UINT64 (address->pointer.physical), header->length)); + return (status); + } + + /* Save allocation type */ + + allocation = ACPI_MEM_MAPPED; + break; + + + default: + + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid address flags %X\n", + address->pointer_type)); + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + /* + * Validate checksum for _most_ tables, + * even the ones whose signature we don't recognize + */ + if (table_info->type != ACPI_TABLE_FACS) { + status = acpi_tb_verify_table_checksum (full_table); + +#if (!ACPI_CHECKSUM_ABORT) + if (ACPI_FAILURE (status)) { + /* Ignore the error if configuration says so */ + + status = AE_OK; + } +#endif + } + + /* Return values */ + + table_info->pointer = full_table; + table_info->length = (acpi_size) header->length; + table_info->allocation = allocation; + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Found table [%4.4s] at %8.8X%8.8X, mapped/copied to %p\n", + full_table->signature, + ACPI_FORMAT_UINT64 (address->pointer.physical), full_table)); + + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * 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, + struct acpi_table_header **table_ptr_loc) +{ + struct acpi_table_desc *table_desc; + u32 i; + + + ACPI_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) { + /* Get the first */ + + *table_ptr_loc = NULL; + if (acpi_gbl_table_lists[table_type].next) { + *table_ptr_loc = acpi_gbl_table_lists[table_type].next->pointer; + } + return_ACPI_STATUS (AE_OK); + } + + /* + * Check for instance out of range + */ + if (instance > acpi_gbl_table_lists[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_table_lists[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); +} + |