287 lines
8.2 KiB
C
287 lines
8.2 KiB
C
/******************************************************************************
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*
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* Module Name: tbrsdt - ACPI RSDT table utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2006, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/actables.h>
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME("tbrsdt")
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_verify_rsdp
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*
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* PARAMETERS: Address - RSDP (Pointer to RSDT)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
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*
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******************************************************************************/
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acpi_status acpi_tb_verify_rsdp(struct acpi_pointer *address)
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{
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struct acpi_table_desc table_info;
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acpi_status status;
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struct rsdp_descriptor *rsdp;
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ACPI_FUNCTION_TRACE("tb_verify_rsdp");
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switch (address->pointer_type) {
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case ACPI_LOGICAL_POINTER:
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rsdp = address->pointer.logical;
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break;
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case ACPI_PHYSICAL_POINTER:
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/*
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* Obtain access to the RSDP structure
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*/
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status = acpi_os_map_memory(address->pointer.physical,
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sizeof(struct rsdp_descriptor),
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(void *)&rsdp);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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break;
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default:
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Verify RSDP signature and checksum */
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status = acpi_tb_validate_rsdp(rsdp);
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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/* The RSDP supplied is OK */
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table_info.pointer = ACPI_CAST_PTR(struct acpi_table_header, rsdp);
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table_info.length = sizeof(struct rsdp_descriptor);
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table_info.allocation = ACPI_MEM_MAPPED;
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/* Save the table pointers and allocation info */
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status = acpi_tb_init_table_descriptor(ACPI_TABLE_RSDP, &table_info);
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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/* Save the RSDP in a global for easy access */
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acpi_gbl_RSDP =
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ACPI_CAST_PTR(struct rsdp_descriptor, table_info.pointer);
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return_ACPI_STATUS(status);
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/* Error exit */
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cleanup:
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if (acpi_gbl_table_flags & ACPI_PHYSICAL_POINTER) {
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acpi_os_unmap_memory(rsdp, sizeof(struct rsdp_descriptor));
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_get_rsdt_address
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*
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* PARAMETERS: out_address - Where the address is returned
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*
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* RETURN: None, Address
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*
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* DESCRIPTION: Extract the address of either the RSDT or XSDT, depending on the
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* version of the RSDP and whether the XSDT pointer is valid
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*
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******************************************************************************/
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void acpi_tb_get_rsdt_address(struct acpi_pointer *out_address)
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{
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ACPI_FUNCTION_ENTRY();
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out_address->pointer_type =
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acpi_gbl_table_flags | ACPI_LOGICAL_ADDRESSING;
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/* Use XSDT if it is present */
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if ((acpi_gbl_RSDP->revision >= 2) &&
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acpi_gbl_RSDP->xsdt_physical_address) {
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out_address->pointer.value =
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acpi_gbl_RSDP->xsdt_physical_address;
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acpi_gbl_root_table_type = ACPI_TABLE_TYPE_XSDT;
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} else {
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/* No XSDT, use the RSDT */
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out_address->pointer.value =
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acpi_gbl_RSDP->rsdt_physical_address;
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acpi_gbl_root_table_type = ACPI_TABLE_TYPE_RSDT;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_validate_rsdt
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*
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* PARAMETERS: table_ptr - Addressable pointer to the RSDT.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Validate signature for the RSDT or XSDT
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*
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******************************************************************************/
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acpi_status acpi_tb_validate_rsdt(struct acpi_table_header *table_ptr)
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{
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int no_match;
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ACPI_FUNCTION_ENTRY();
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/*
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* Search for appropriate signature, RSDT or XSDT
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*/
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if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
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no_match = ACPI_STRNCMP((char *)table_ptr, RSDT_SIG,
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sizeof(RSDT_SIG) - 1);
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} else {
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no_match = ACPI_STRNCMP((char *)table_ptr, XSDT_SIG,
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sizeof(XSDT_SIG) - 1);
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}
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if (no_match) {
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/* Invalid RSDT or XSDT signature */
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ACPI_ERROR((AE_INFO,
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"Invalid signature where RSDP indicates RSDT/XSDT should be located. RSDP:"));
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ACPI_DUMP_BUFFER(acpi_gbl_RSDP, 20);
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ACPI_ERROR((AE_INFO,
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"RSDT/XSDT signature at %X (%p) is invalid",
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acpi_gbl_RSDP->rsdt_physical_address,
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(void *)(acpi_native_uint) acpi_gbl_RSDP->
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rsdt_physical_address));
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if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
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ACPI_ERROR((AE_INFO, "Looking for RSDT"));
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} else {
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ACPI_ERROR((AE_INFO, "Looking for XSDT"));
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}
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ACPI_DUMP_BUFFER((char *)table_ptr, 48);
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return (AE_BAD_SIGNATURE);
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_get_table_rsdt
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
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*
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******************************************************************************/
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acpi_status acpi_tb_get_table_rsdt(void)
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{
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struct acpi_table_desc table_info;
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acpi_status status;
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struct acpi_pointer address;
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ACPI_FUNCTION_TRACE("tb_get_table_rsdt");
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/* Get the RSDT/XSDT via the RSDP */
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acpi_tb_get_rsdt_address(&address);
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table_info.type = ACPI_TABLE_XSDT;
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status = acpi_tb_get_table(&address, &table_info);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Could not get the RSDT/XSDT"));
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return_ACPI_STATUS(status);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"RSDP located at %p, points to RSDT physical=%8.8X%8.8X\n",
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acpi_gbl_RSDP,
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ACPI_FORMAT_UINT64(address.pointer.value)));
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/* Check the RSDT or XSDT signature */
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status = acpi_tb_validate_rsdt(table_info.pointer);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Get the number of tables defined in the RSDT or XSDT */
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acpi_gbl_rsdt_table_count = acpi_tb_get_table_count(acpi_gbl_RSDP,
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table_info.pointer);
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/* Convert and/or copy to an XSDT structure */
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status = acpi_tb_convert_to_xsdt(&table_info);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Save the table pointers and allocation info */
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status = acpi_tb_init_table_descriptor(ACPI_TABLE_XSDT, &table_info);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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acpi_gbl_XSDT = ACPI_CAST_PTR(XSDT_DESCRIPTOR, table_info.pointer);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "XSDT located at %p\n", acpi_gbl_XSDT));
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return_ACPI_STATUS(status);
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}
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