diff options
Diffstat (limited to 'drivers/acpi/tables/tbxfroot.c')
| -rw-r--r-- | drivers/acpi/tables/tbxfroot.c | 273 |
1 files changed, 0 insertions, 273 deletions
diff --git a/drivers/acpi/tables/tbxfroot.c b/drivers/acpi/tables/tbxfroot.c deleted file mode 100644 index 2d157e0f98d2..000000000000 --- a/drivers/acpi/tables/tbxfroot.c +++ /dev/null @@ -1,273 +0,0 @@ -/****************************************************************************** - * - * Module Name: tbxfroot - Find the root ACPI table (RSDT) - * - *****************************************************************************/ - -/* - * Copyright (C) 2000 - 2008, Intel Corp. - * 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("tbxfroot") - -/* Local prototypes */ -static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length); - -static acpi_status acpi_tb_validate_rsdp(struct acpi_table_rsdp *rsdp); - -/******************************************************************************* - * - * FUNCTION: acpi_tb_validate_rsdp - * - * PARAMETERS: Rsdp - Pointer to unvalidated RSDP - * - * RETURN: Status - * - * DESCRIPTION: Validate the RSDP (ptr) - * - ******************************************************************************/ - -static acpi_status acpi_tb_validate_rsdp(struct acpi_table_rsdp *rsdp) -{ - ACPI_FUNCTION_ENTRY(); - - /* - * The signature and checksum must both be correct - * - * Note: Sometimes there exists more than one RSDP in memory; the valid - * RSDP has a valid checksum, all others have an invalid checksum. - */ - if (ACPI_STRNCMP((char *)rsdp, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1) - != 0) { - - /* Nope, BAD Signature */ - - return (AE_BAD_SIGNATURE); - } - - /* Check the standard checksum */ - - if (acpi_tb_checksum((u8 *) rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) { - return (AE_BAD_CHECKSUM); - } - - /* Check extended checksum if table version >= 2 */ - - if ((rsdp->revision >= 2) && - (acpi_tb_checksum((u8 *) rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) { - return (AE_BAD_CHECKSUM); - } - - return (AE_OK); -} - -/******************************************************************************* - * - * FUNCTION: acpi_find_root_pointer - * - * PARAMETERS: table_address - Where the table pointer is returned - * - * 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_find_root_pointer(acpi_size *table_address) -{ - u8 *table_ptr; - u8 *mem_rover; - u32 physical_address; - - ACPI_FUNCTION_TRACE(acpi_find_root_pointer); - - /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */ - - table_ptr = acpi_os_map_memory((acpi_physical_address) - ACPI_EBDA_PTR_LOCATION, - ACPI_EBDA_PTR_LENGTH); - if (!table_ptr) { - ACPI_ERROR((AE_INFO, - "Could not map memory at %8.8X for length %X", - ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH)); - - return_ACPI_STATUS(AE_NO_MEMORY); - } - - ACPI_MOVE_16_TO_32(&physical_address, table_ptr); - - /* Convert segment part to physical address */ - - physical_address <<= 4; - 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) - */ - table_ptr = acpi_os_map_memory((acpi_physical_address) - physical_address, - ACPI_EBDA_WINDOW_SIZE); - if (!table_ptr) { - ACPI_ERROR((AE_INFO, - "Could not map memory at %8.8X for length %X", - physical_address, ACPI_EBDA_WINDOW_SIZE)); - - return_ACPI_STATUS(AE_NO_MEMORY); - } - - 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) { - - /* Return the physical address */ - - physical_address += - (u32) ACPI_PTR_DIFF(mem_rover, table_ptr); - - *table_address = physical_address; - return_ACPI_STATUS(AE_OK); - } - } - - /* - * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh - */ - table_ptr = acpi_os_map_memory((acpi_physical_address) - ACPI_HI_RSDP_WINDOW_BASE, - ACPI_HI_RSDP_WINDOW_SIZE); - - if (!table_ptr) { - ACPI_ERROR((AE_INFO, - "Could not map memory at %8.8X for length %X", - ACPI_HI_RSDP_WINDOW_BASE, - ACPI_HI_RSDP_WINDOW_SIZE)); - - return_ACPI_STATUS(AE_NO_MEMORY); - } - - 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) { - - /* Return the physical address */ - - physical_address = (u32) - (ACPI_HI_RSDP_WINDOW_BASE + - ACPI_PTR_DIFF(mem_rover, table_ptr)); - - *table_address = physical_address; - return_ACPI_STATUS(AE_OK); - } - - /* A valid RSDP was not found */ - - ACPI_ERROR((AE_INFO, "A valid RSDP was not found")); - return_ACPI_STATUS(AE_NOT_FOUND); -} - -/******************************************************************************* - * - * 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 - * - ******************************************************************************/ -static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length) -{ - acpi_status status; - u8 *mem_rover; - u8 *end_address; - - 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 RSDP signature and checksum must both be correct */ - - status = - acpi_tb_validate_rsdp(ACPI_CAST_PTR - (struct acpi_table_rsdp, mem_rover)); - if (ACPI_SUCCESS(status)) { - - /* Sig and checksum valid, we have found a real RSDP */ - - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "RSDP located at physical address %p\n", - mem_rover)); - return_PTR(mem_rover); - } - - /* No sig match or bad checksum, keep searching */ - } - - /* Searched entire block, no RSDP was found */ - - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Searched entire block from %p, valid RSDP was not found\n", - start_address)); - return_PTR(NULL); -} |