| /****************************************************************************** |
| * |
| * Module Name: tbxfroot - Find the root ACPI table (RSDT) |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2006, 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("tbxfroot") |
| |
| /* Local prototypes */ |
| static acpi_status |
| acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags); |
| |
| static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length); |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_tb_validate_rsdp |
| * |
| * PARAMETERS: Rsdp - Pointer to unvalidated RSDP |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Validate the RSDP (ptr) |
| * |
| ******************************************************************************/ |
| |
| acpi_status acpi_tb_validate_rsdp(struct rsdp_descriptor *rsdp) |
| { |
| ACPI_FUNCTION_ENTRY(); |
| |
| /* |
| * The signature and checksum must both be correct |
| */ |
| if (ACPI_STRNCMP((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0) { |
| |
| /* Nope, BAD Signature */ |
| |
| return (AE_BAD_SIGNATURE); |
| } |
| |
| /* Check the standard checksum */ |
| |
| if (acpi_tb_sum_table(rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) { |
| return (AE_BAD_CHECKSUM); |
| } |
| |
| /* Check extended checksum if table version >= 2 */ |
| |
| if ((rsdp->revision >= 2) && |
| (acpi_tb_sum_table(rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) { |
| return (AE_BAD_CHECKSUM); |
| } |
| |
| return (AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * 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 |
| * table_ptr - Where the table pointer is returned |
| * |
| * 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_COMPARE_NAME(signature, DSDT_SIG)) { |
| /* |
| * 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 RDSP signature and checksum must both be correct */ |
| |
| status = acpi_tb_validate_rsdp(acpi_gbl_RSDP); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| } |
| |
| /* 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_ALLOCATE_ZEROED(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_ALLOCATE(sizeof(struct acpi_table_header)); |
| if (!header) { |
| status = AE_NO_MEMORY; |
| goto cleanup; |
| } |
| |
| table_info = ACPI_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 |
| * RSDT pointers are 32 bits, XSDT pointers are 64 bits |
| */ |
| if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) { |
| address.pointer.value = |
| (ACPI_CAST_PTR |
| (struct rsdt_descriptor, |
| rsdt_info->pointer))->table_offset_entry[i]; |
| } else { |
| address.pointer.value = |
| (ACPI_CAST_PTR |
| (struct 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_COMPARE_NAME(header->signature, signature)) { |
| |
| /* 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: |
| if (rsdt_info->pointer) { |
| acpi_os_unmap_memory(rsdt_info->pointer, |
| (acpi_size) rsdt_info->pointer->length); |
| } |
| ACPI_FREE(rsdt_info); |
| |
| if (header) { |
| ACPI_FREE(header); |
| } |
| if (table_info) { |
| ACPI_FREE(table_info); |
| } |
| return_ACPI_STATUS(status); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_get_firmware_table) |
| |
| /* TBD: Move to a new file */ |
| #if ACPI_MACHINE_WIDTH != 16 |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_find_root_pointer |
| * |
| * PARAMETERS: Flags - Logical/Physical addressing |
| * rsdp_address - Where to place the RSDP address |
| * |
| * 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_EXCEPTION((AE_INFO, status, |
| "RSDP structure not found - Flags=%X", 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); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_find_root_pointer) |
| |
| /******************************************************************************* |
| * |
| * 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 rsdp_descriptor, 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); |
| } |
| |
| /******************************************************************************* |
| * |
| * 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. |
| * |
| ******************************************************************************/ |
| |
| static 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 logical addressing or physical addressing |
| */ |
| if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) { |
| |
| /* 1a) Get the location of the Extended BIOS Data Area (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_ERROR((AE_INFO, |
| "Could not map memory at %8.8X for length %X", |
| ACPI_EBDA_PTR_LOCATION, |
| ACPI_EBDA_PTR_LENGTH)); |
| |
| return_ACPI_STATUS(status); |
| } |
| |
| 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) |
| */ |
| status = acpi_os_map_memory((acpi_physical_address) |
| physical_address, |
| ACPI_EBDA_WINDOW_SIZE, |
| (void *)&table_ptr); |
| if (ACPI_FAILURE(status)) { |
| ACPI_ERROR((AE_INFO, |
| "Could not map memory at %8.8X for length %X", |
| 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) { |
| |
| /* 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_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(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) { |
| |
| /* 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) { |
| |
| /* 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); |
| } |
| } |
| |
| /* A valid RSDP was not found */ |
| |
| ACPI_ERROR((AE_INFO, "No valid RSDP was found")); |
| return_ACPI_STATUS(AE_NOT_FOUND); |
| } |
| |
| #endif |