/******************************************************************************
*
* 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),
ACPI_CAST_PTR(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;
}
/* RSDP is ok. Init the table info */
table_info.pointer = ACPI_CAST_PTR(struct acpi_table_header, rsdp);
table_info.length = sizeof(struct rsdp_descriptor);
if (address->pointer_type == ACPI_PHYSICAL_POINTER) {
table_info.allocation = ACPI_MEM_MAPPED;
} else {
table_info.allocation = ACPI_MEM_NOT_ALLOCATED;
}
/* 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();
/* Validate minimum length */
if (table_ptr->length < sizeof(struct acpi_table_header)) {
ACPI_ERROR((AE_INFO,
"RSDT/XSDT length (%X) is smaller than minimum (%zX)",
table_ptr->length,
sizeof(struct acpi_table_header)));
return (AE_INVALID_TABLE_LENGTH);
}
/* 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 is invalid",
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(ACPI_CAST_PTR(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)) {
goto error_cleanup;
}
/* 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)) {
goto error_cleanup;
}
/* Save the table pointers and allocation info */
status = acpi_tb_init_table_descriptor(ACPI_TABLE_ID_XSDT, &table_info);
if (ACPI_FAILURE(status)) {
goto error_cleanup;
}
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);
error_cleanup:
/* Free table allocated by acpi_tb_get_table */
acpi_tb_delete_single_table(&table_info);
return_ACPI_STATUS(status);
}
