You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
641 lines
18 KiB
641 lines
18 KiB
/******************************************************************************
|
|
*
|
|
* 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 <linux/module.h>
|
|
|
|
#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_generate_checksum(rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
|
|
return (AE_BAD_CHECKSUM);
|
|
}
|
|
|
|
/* Check extended checksum if table version >= 2 */
|
|
|
|
if ((rsdp->revision >= 2) &&
|
|
(acpi_tb_generate_checksum(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_STRNCMP(signature, DSDT_SIG, ACPI_NAME_SIZE)) {
|
|
/*
|
|
* 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_MEM_CALLOCATE(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_MEM_ALLOCATE(sizeof(struct acpi_table_header));
|
|
if (!header) {
|
|
status = AE_NO_MEMORY;
|
|
goto cleanup;
|
|
}
|
|
|
|
table_info = ACPI_MEM_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
|
|
(RSDT_DESCRIPTOR,
|
|
rsdt_info->pointer))->table_offset_entry[i];
|
|
} else {
|
|
address.pointer.value =
|
|
(ACPI_CAST_PTR
|
|
(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_STRNCMP(header->signature, signature, ACPI_NAME_SIZE)) {
|
|
/* 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_MEM_FREE(rsdt_info);
|
|
|
|
if (header) {
|
|
ACPI_MEM_FREE(header);
|
|
}
|
|
if (table_info) {
|
|
ACPI_MEM_FREE(table_info);
|
|
}
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* 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
|
|
|