| /****************************************************************************** |
| * |
| * Module Name: tbrsdt - ACPI RSDT table utilities |
| * |
| *****************************************************************************/ |
| |
| /* |
| * 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("tbrsdt") |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_tb_verify_rsdp |
| * |
| * PARAMETERS: Address - RSDP (Pointer to RSDT) |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table) |
| * |
| ******************************************************************************/ |
| acpi_status acpi_tb_verify_rsdp(struct acpi_pointer *address) |
| { |
| struct acpi_table_desc table_info; |
| acpi_status status; |
| struct rsdp_descriptor *rsdp; |
| |
| ACPI_FUNCTION_TRACE(tb_verify_rsdp); |
| |
| switch (address->pointer_type) { |
| case ACPI_LOGICAL_POINTER: |
| |
| rsdp = address->pointer.logical; |
| break; |
| |
| case ACPI_PHYSICAL_POINTER: |
| /* |
| * Obtain access to the RSDP structure |
| */ |
| status = acpi_os_map_memory(address->pointer.physical, |
| sizeof(struct rsdp_descriptor), |
| (void *)&rsdp); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| break; |
| |
| default: |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| /* Verify RSDP signature and checksum */ |
| |
| status = acpi_tb_validate_rsdp(rsdp); |
| if (ACPI_FAILURE(status)) { |
| goto cleanup; |
| } |
| |
| /* The RSDP supplied is OK */ |
| |
| table_info.pointer = ACPI_CAST_PTR(struct acpi_table_header, rsdp); |
| table_info.length = sizeof(struct rsdp_descriptor); |
| table_info.allocation = ACPI_MEM_MAPPED; |
| |
| /* Save the table pointers and allocation info */ |
| |
| status = acpi_tb_init_table_descriptor(ACPI_TABLE_ID_RSDP, &table_info); |
| if (ACPI_FAILURE(status)) { |
| goto cleanup; |
| } |
| |
| /* Save the RSDP in a global for easy access */ |
| |
| acpi_gbl_RSDP = |
| ACPI_CAST_PTR(struct rsdp_descriptor, table_info.pointer); |
| return_ACPI_STATUS(status); |
| |
| /* Error exit */ |
| cleanup: |
| |
| if (acpi_gbl_table_flags & ACPI_PHYSICAL_POINTER) { |
| acpi_os_unmap_memory(rsdp, sizeof(struct rsdp_descriptor)); |
| } |
| return_ACPI_STATUS(status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_tb_get_rsdt_address |
| * |
| * PARAMETERS: out_address - Where the address is returned |
| * |
| * RETURN: None, Address |
| * |
| * DESCRIPTION: Extract the address of either the RSDT or XSDT, depending on the |
| * version of the RSDP and whether the XSDT pointer is valid |
| * |
| ******************************************************************************/ |
| |
| void acpi_tb_get_rsdt_address(struct acpi_pointer *out_address) |
| { |
| |
| ACPI_FUNCTION_ENTRY(); |
| |
| out_address->pointer_type = |
| acpi_gbl_table_flags | ACPI_LOGICAL_ADDRESSING; |
| |
| /* Use XSDT if it is present */ |
| |
| if ((acpi_gbl_RSDP->revision >= 2) && |
| acpi_gbl_RSDP->xsdt_physical_address) { |
| out_address->pointer.value = |
| acpi_gbl_RSDP->xsdt_physical_address; |
| acpi_gbl_root_table_type = ACPI_TABLE_TYPE_XSDT; |
| } else { |
| /* No XSDT, use the RSDT */ |
| |
| out_address->pointer.value = |
| acpi_gbl_RSDP->rsdt_physical_address; |
| acpi_gbl_root_table_type = ACPI_TABLE_TYPE_RSDT; |
| } |
| } |
| |
| /******************************************************************************* |
| * |
| * 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(struct acpi_table_header *table_ptr) |
| { |
| char *signature; |
| |
| ACPI_FUNCTION_ENTRY(); |
| |
| /* Search for appropriate signature, RSDT or XSDT */ |
| |
| if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) { |
| signature = RSDT_SIG; |
| } else { |
| signature = XSDT_SIG; |
| } |
| |
| if (!ACPI_COMPARE_NAME(table_ptr->signature, signature)) { |
| |
| /* Invalid RSDT or XSDT signature */ |
| |
| ACPI_ERROR((AE_INFO, |
| "Invalid signature where RSDP indicates RSDT/XSDT should be located. RSDP:")); |
| |
| ACPI_DUMP_BUFFER(acpi_gbl_RSDP, 20); |
| |
| ACPI_ERROR((AE_INFO, |
| "RSDT/XSDT signature at %X (%p) is invalid", |
| acpi_gbl_RSDP->rsdt_physical_address, |
| (void *)(acpi_native_uint) acpi_gbl_RSDP-> |
| rsdt_physical_address)); |
| |
| if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) { |
| ACPI_ERROR((AE_INFO, "Looking for RSDT")); |
| } else { |
| ACPI_ERROR((AE_INFO, "Looking for XSDT")); |
| } |
| |
| ACPI_DUMP_BUFFER((char *)table_ptr, 48); |
| return (AE_BAD_SIGNATURE); |
| } |
| |
| return (AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_tb_get_table_rsdt |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table) |
| * |
| ******************************************************************************/ |
| |
| acpi_status acpi_tb_get_table_rsdt(void) |
| { |
| struct acpi_table_desc table_info; |
| acpi_status status; |
| struct acpi_pointer address; |
| |
| ACPI_FUNCTION_TRACE(tb_get_table_rsdt); |
| |
| /* Get the RSDT/XSDT via the RSDP */ |
| |
| acpi_tb_get_rsdt_address(&address); |
| |
| table_info.type = ACPI_TABLE_ID_XSDT; |
| status = acpi_tb_get_table(&address, &table_info); |
| if (ACPI_FAILURE(status)) { |
| ACPI_EXCEPTION((AE_INFO, status, |
| "Could not get the RSDT/XSDT")); |
| return_ACPI_STATUS(status); |
| } |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| "RSDP located at %p, points to RSDT physical=%8.8X%8.8X\n", |
| acpi_gbl_RSDP, |
| ACPI_FORMAT_UINT64(address.pointer.value))); |
| |
| /* Check the RSDT or XSDT signature */ |
| |
| status = acpi_tb_validate_rsdt(table_info.pointer); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| /* Get the number of tables defined in the RSDT or XSDT */ |
| |
| acpi_gbl_rsdt_table_count = acpi_tb_get_table_count(acpi_gbl_RSDP, |
| table_info.pointer); |
| |
| /* Convert and/or copy to an XSDT structure */ |
| |
| status = acpi_tb_convert_to_xsdt(&table_info); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| /* Save the table pointers and allocation info */ |
| |
| status = acpi_tb_init_table_descriptor(ACPI_TABLE_ID_XSDT, &table_info); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| acpi_gbl_XSDT = |
| ACPI_CAST_PTR(struct xsdt_descriptor, table_info.pointer); |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, "XSDT located at %p\n", acpi_gbl_XSDT)); |
| return_ACPI_STATUS(status); |
| } |