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Diffstat (limited to 'drivers/acpi/tables/tbxfroot.c')
| -rw-r--r-- | drivers/acpi/tables/tbxfroot.c | 606 |
1 files changed, 606 insertions, 0 deletions
diff --git a/drivers/acpi/tables/tbxfroot.c b/drivers/acpi/tables/tbxfroot.c new file mode 100644 index 000000000000..6e8072ebbac6 --- /dev/null +++ b/drivers/acpi/tables/tbxfroot.c @@ -0,0 +1,606 @@ +/****************************************************************************** + * + * Module Name: tbxfroot - Find the root ACPI table (RSDT) + * + *****************************************************************************/ + +/* + * 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 <linux/module.h> + +#include <acpi/acpi.h> +#include <acpi/actables.h> + + +#define _COMPONENT ACPI_TABLES + ACPI_MODULE_NAME ("tbxfroot") + + +/******************************************************************************* + * + * FUNCTION: acpi_tb_find_table + * + * PARAMETERS: Signature - String with ACPI table signature + * oem_id - String with the table OEM ID + * oem_table_id - String with the OEM Table ID. + * + * RETURN: Status + * + * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the + * Signature, OEM ID and OEM Table ID. + * + ******************************************************************************/ + +acpi_status +acpi_tb_find_table ( + char *signature, + char *oem_id, + char *oem_table_id, + struct acpi_table_header **table_ptr) +{ + acpi_status status; + struct acpi_table_header *table; + + + ACPI_FUNCTION_TRACE ("tb_find_table"); + + + /* Validate string lengths */ + + if ((ACPI_STRLEN (signature) > ACPI_NAME_SIZE) || + (ACPI_STRLEN (oem_id) > sizeof (table->oem_id)) || + (ACPI_STRLEN (oem_table_id) > sizeof (table->oem_table_id))) { + return_ACPI_STATUS (AE_AML_STRING_LIMIT); + } + + if (!ACPI_STRNCMP (signature, DSDT_SIG, ACPI_NAME_SIZE)) { + /* + * The DSDT pointer is contained in the FADT, not the RSDT. + * This code should suffice, because the only code that would perform + * a "find" on the DSDT is the data_table_region() AML opcode -- in + * which case, the DSDT is guaranteed to be already loaded. + * If this becomes insufficient, the FADT will have to be found first. + */ + if (!acpi_gbl_DSDT) { + return_ACPI_STATUS (AE_NO_ACPI_TABLES); + } + + table = acpi_gbl_DSDT; + } + else { + /* Find the table */ + + status = acpi_get_firmware_table (signature, 1, + ACPI_LOGICAL_ADDRESSING, &table); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + } + + /* Check oem_id and oem_table_id */ + + if ((oem_id[0] && ACPI_STRNCMP ( + oem_id, table->oem_id, sizeof (table->oem_id))) || + (oem_table_id[0] && ACPI_STRNCMP ( + oem_table_id, table->oem_table_id, sizeof (table->oem_table_id)))) { + return_ACPI_STATUS (AE_AML_NAME_NOT_FOUND); + } + + ACPI_DEBUG_PRINT ((ACPI_DB_TABLES, "Found table [%4.4s]\n", table->signature)); + *table_ptr = table; + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_get_firmware_table + * + * PARAMETERS: Signature - Any ACPI table signature + * Instance - the non zero instance of the table, allows + * support for multiple tables of the same type + * Flags - Physical/Virtual support + * table_pointer - Where a buffer containing the table is + * returned + * + * RETURN: Status + * + * DESCRIPTION: This function is called to get an ACPI table. A buffer is + * allocated for the table and returned in table_pointer. + * This table will be a complete table including the header. + * + ******************************************************************************/ + +acpi_status +acpi_get_firmware_table ( + acpi_string signature, + u32 instance, + u32 flags, + struct acpi_table_header **table_pointer) +{ + acpi_status status; + struct acpi_pointer address; + struct acpi_table_header *header = NULL; + struct acpi_table_desc *table_info = NULL; + struct acpi_table_desc *rsdt_info; + u32 table_count; + u32 i; + u32 j; + + + ACPI_FUNCTION_TRACE ("acpi_get_firmware_table"); + + + /* + * Ensure that at least the table manager is initialized. We don't + * require that the entire ACPI subsystem is up for this interface. + * If we have a buffer, we must have a length too + */ + if ((instance == 0) || + (!signature) || + (!table_pointer)) { + return_ACPI_STATUS (AE_BAD_PARAMETER); + } + + /* Ensure that we have a RSDP */ + + if (!acpi_gbl_RSDP) { + /* Get the RSDP */ + + status = acpi_os_get_root_pointer (flags, &address); + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "RSDP not found\n")); + return_ACPI_STATUS (AE_NO_ACPI_TABLES); + } + + /* Map and validate the RSDP */ + + if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) { + status = acpi_os_map_memory (address.pointer.physical, sizeof (struct rsdp_descriptor), + (void *) &acpi_gbl_RSDP); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + } + else { + acpi_gbl_RSDP = address.pointer.logical; + } + + /* The signature and checksum must both be correct */ + + if (ACPI_STRNCMP ((char *) acpi_gbl_RSDP, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) { + /* Nope, BAD Signature */ + + return_ACPI_STATUS (AE_BAD_SIGNATURE); + } + + if (acpi_tb_checksum (acpi_gbl_RSDP, ACPI_RSDP_CHECKSUM_LENGTH) != 0) { + /* Nope, BAD Checksum */ + + return_ACPI_STATUS (AE_BAD_CHECKSUM); + } + } + + /* Get the RSDT address via the RSDP */ + + acpi_tb_get_rsdt_address (&address); + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "RSDP located at %p, RSDT physical=%8.8X%8.8X \n", + acpi_gbl_RSDP, + ACPI_FORMAT_UINT64 (address.pointer.value))); + + /* Insert processor_mode flags */ + + address.pointer_type |= flags; + + /* Get and validate the RSDT */ + + rsdt_info = ACPI_MEM_CALLOCATE (sizeof (struct acpi_table_desc)); + if (!rsdt_info) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + status = acpi_tb_get_table (&address, rsdt_info); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + status = acpi_tb_validate_rsdt (rsdt_info->pointer); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + /* Allocate a scratch table header and table descriptor */ + + header = ACPI_MEM_ALLOCATE (sizeof (struct acpi_table_header)); + if (!header) { + status = AE_NO_MEMORY; + goto cleanup; + } + + table_info = ACPI_MEM_ALLOCATE (sizeof (struct acpi_table_desc)); + if (!table_info) { + status = AE_NO_MEMORY; + goto cleanup; + } + + /* Get the number of table pointers within the RSDT */ + + table_count = acpi_tb_get_table_count (acpi_gbl_RSDP, rsdt_info->pointer); + address.pointer_type = acpi_gbl_table_flags | flags; + + /* + * Search the RSDT/XSDT for the correct instance of the + * requested table + */ + for (i = 0, j = 0; i < table_count; i++) { + /* Get the next table pointer, handle RSDT vs. XSDT */ + + if (acpi_gbl_RSDP->revision < 2) { + address.pointer.value = (ACPI_CAST_PTR ( + RSDT_DESCRIPTOR, rsdt_info->pointer))->table_offset_entry[i]; + } + else { + address.pointer.value = (ACPI_CAST_PTR ( + XSDT_DESCRIPTOR, rsdt_info->pointer))->table_offset_entry[i]; + } + + /* Get the table header */ + + status = acpi_tb_get_table_header (&address, header); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + /* Compare table signatures and table instance */ + + if (!ACPI_STRNCMP (header->signature, signature, ACPI_NAME_SIZE)) { + /* An instance of the table was found */ + + j++; + if (j >= instance) { + /* Found the correct instance, get the entire table */ + + status = acpi_tb_get_table_body (&address, header, table_info); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + *table_pointer = table_info->pointer; + goto cleanup; + } + } + } + + /* Did not find the table */ + + status = AE_NOT_EXIST; + + +cleanup: + acpi_os_unmap_memory (rsdt_info->pointer, (acpi_size) rsdt_info->pointer->length); + ACPI_MEM_FREE (rsdt_info); + + if (header) { + ACPI_MEM_FREE (header); + } + if (table_info) { + ACPI_MEM_FREE (table_info); + } + return_ACPI_STATUS (status); +} +EXPORT_SYMBOL(acpi_get_firmware_table); + + +/* TBD: Move to a new file */ + +#if ACPI_MACHINE_WIDTH != 16 + +/******************************************************************************* + * + * FUNCTION: acpi_find_root_pointer + * + * PARAMETERS: **rsdp_address - Where to place the RSDP address + * Flags - Logical/Physical addressing + * + * RETURN: Status, Physical address of the RSDP + * + * DESCRIPTION: Find the RSDP + * + ******************************************************************************/ + +acpi_status +acpi_find_root_pointer ( + u32 flags, + struct acpi_pointer *rsdp_address) +{ + struct acpi_table_desc table_info; + acpi_status status; + + + ACPI_FUNCTION_TRACE ("acpi_find_root_pointer"); + + + /* Get the RSDP */ + + status = acpi_tb_find_rsdp (&table_info, flags); + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "RSDP structure not found, %s Flags=%X\n", + acpi_format_exception (status), flags)); + return_ACPI_STATUS (AE_NO_ACPI_TABLES); + } + + rsdp_address->pointer_type = ACPI_PHYSICAL_POINTER; + rsdp_address->pointer.physical = table_info.physical_address; + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_tb_scan_memory_for_rsdp + * + * PARAMETERS: start_address - Starting pointer for search + * Length - Maximum length to search + * + * RETURN: Pointer to the RSDP if found, otherwise NULL. + * + * DESCRIPTION: Search a block of memory for the RSDP signature + * + ******************************************************************************/ + +u8 * +acpi_tb_scan_memory_for_rsdp ( + u8 *start_address, + u32 length) +{ + u8 *mem_rover; + u8 *end_address; + u8 checksum; + + + ACPI_FUNCTION_TRACE ("tb_scan_memory_for_rsdp"); + + + end_address = start_address + length; + + /* Search from given start address for the requested length */ + + for (mem_rover = start_address; mem_rover < end_address; + mem_rover += ACPI_RSDP_SCAN_STEP) { + /* The signature and checksum must both be correct */ + + if (ACPI_STRNCMP ((char *) mem_rover, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) { + /* No signature match, keep looking */ + + continue; + } + + /* Signature matches, check the appropriate checksum */ + + if ((ACPI_CAST_PTR (struct rsdp_descriptor, mem_rover))->revision < 2) { + /* ACPI version 1.0 */ + + checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_CHECKSUM_LENGTH); + } + else { + /* Post ACPI 1.0, use extended_checksum */ + + checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_XCHECKSUM_LENGTH); + } + + if (checksum == 0) { + /* Checksum valid, we have found a valid RSDP */ + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "RSDP located at physical address %p\n", mem_rover)); + return_PTR (mem_rover); + } + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Found an RSDP at physical address %p, but it has a bad checksum\n", + mem_rover)); + } + + /* Searched entire block, no RSDP was found */ + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Searched entire block, no valid RSDP was found.\n")); + return_PTR (NULL); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_tb_find_rsdp + * + * PARAMETERS: *table_info - Where the table info is returned + * Flags - Current memory mode (logical vs. + * physical addressing) + * + * RETURN: Status, RSDP physical address + * + * DESCRIPTION: search lower 1_mbyte of memory for the root system descriptor + * pointer structure. If it is found, set *RSDP to point to it. + * + * NOTE1: The RSDp must be either in the first 1_k of the Extended + * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.) + * Only a 32-bit physical address is necessary. + * + * NOTE2: This function is always available, regardless of the + * initialization state of the rest of ACPI. + * + ******************************************************************************/ + +acpi_status +acpi_tb_find_rsdp ( + struct acpi_table_desc *table_info, + u32 flags) +{ + u8 *table_ptr; + u8 *mem_rover; + u32 physical_address; + acpi_status status; + + + ACPI_FUNCTION_TRACE ("tb_find_rsdp"); + + + /* + * Scan supports either 1) Logical addressing or 2) Physical addressing + */ + if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) { + /* + * 1a) Get the location of the EBDA + */ + status = acpi_os_map_memory ((acpi_physical_address) ACPI_EBDA_PTR_LOCATION, + ACPI_EBDA_PTR_LENGTH, + (void *) &table_ptr); + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Could not map memory at %8.8X for length %X\n", + ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH)); + return_ACPI_STATUS (status); + } + + ACPI_MOVE_16_TO_32 (&physical_address, table_ptr); + physical_address <<= 4; /* Convert segment to physical address */ + acpi_os_unmap_memory (table_ptr, ACPI_EBDA_PTR_LENGTH); + + /* EBDA present? */ + + if (physical_address > 0x400) { + /* + * 1b) Search EBDA paragraphs (EBDa is required to be a minimum of 1_k length) + */ + status = acpi_os_map_memory ((acpi_physical_address) physical_address, + ACPI_EBDA_WINDOW_SIZE, + (void *) &table_ptr); + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Could not map memory at %8.8X for length %X\n", + physical_address, ACPI_EBDA_WINDOW_SIZE)); + return_ACPI_STATUS (status); + } + + mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_EBDA_WINDOW_SIZE); + acpi_os_unmap_memory (table_ptr, ACPI_EBDA_WINDOW_SIZE); + + if (mem_rover) { + /* Found it, return the physical address */ + + physical_address += ACPI_PTR_DIFF (mem_rover, table_ptr); + + table_info->physical_address = (acpi_physical_address) physical_address; + return_ACPI_STATUS (AE_OK); + } + } + + /* + * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh + */ + status = acpi_os_map_memory ((acpi_physical_address) ACPI_HI_RSDP_WINDOW_BASE, + ACPI_HI_RSDP_WINDOW_SIZE, + (void *) &table_ptr); + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Could not map memory at %8.8X for length %X\n", + ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE)); + return_ACPI_STATUS (status); + } + + mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE); + acpi_os_unmap_memory (table_ptr, ACPI_HI_RSDP_WINDOW_SIZE); + + if (mem_rover) { + /* Found it, return the physical address */ + + physical_address = ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (mem_rover, table_ptr); + + table_info->physical_address = (acpi_physical_address) physical_address; + return_ACPI_STATUS (AE_OK); + } + } + + /* + * Physical addressing + */ + else { + /* + * 1a) Get the location of the EBDA + */ + ACPI_MOVE_16_TO_32 (&physical_address, ACPI_EBDA_PTR_LOCATION); + physical_address <<= 4; /* Convert segment to physical address */ + + /* EBDA present? */ + + if (physical_address > 0x400) { + /* + * 1b) Search EBDA paragraphs (EBDa is required to be a minimum of 1_k length) + */ + mem_rover = acpi_tb_scan_memory_for_rsdp (ACPI_PHYSADDR_TO_PTR (physical_address), + ACPI_EBDA_WINDOW_SIZE); + if (mem_rover) { + /* Found it, return the physical address */ + + table_info->physical_address = ACPI_TO_INTEGER (mem_rover); + return_ACPI_STATUS (AE_OK); + } + } + + /* + * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh + */ + mem_rover = acpi_tb_scan_memory_for_rsdp (ACPI_PHYSADDR_TO_PTR (ACPI_HI_RSDP_WINDOW_BASE), + ACPI_HI_RSDP_WINDOW_SIZE); + if (mem_rover) { + /* Found it, return the physical address */ + + table_info->physical_address = ACPI_TO_INTEGER (mem_rover); + return_ACPI_STATUS (AE_OK); + } + } + + /* RSDP signature was not found */ + + return_ACPI_STATUS (AE_NOT_FOUND); +} + +#endif + |