URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [acpi/] [tables/] [tbxfroot.c] - Rev 1774
Go to most recent revision | Compare with Previous | Blame | View Log
/****************************************************************************** * * Module Name: tbxfroot - Find the root ACPI table (RSDT) * *****************************************************************************/ /* * Copyright (C) 2000 - 2004, 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") /******************************************************************************* * * 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. * * 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); } /* 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_STRCMP (oem_id, table->oem_id)) || (oem_table_id[0] && ACPI_STRCMP (oem_table_id, table->oem_table_id))) { return_ACPI_STATUS (AE_AML_NAME_NOT_FOUND); } *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 * ret_buffer - pointer to a structure containing a buffer to * receive the table * * RETURN: Status * * DESCRIPTION: This function is called to get an ACPI table. The caller * supplies an out_buffer large enough to contain the entire ACPI * table. Upon completion * the out_buffer->Length field will indicate the number of bytes * copied into the out_buffer->buf_ptr buffer. 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) { struct acpi_pointer rsdp_address; struct acpi_pointer address; acpi_status status; struct acpi_table_header header; struct acpi_table_desc table_info; 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); } rsdt_info.pointer = NULL; if (!acpi_gbl_RSDP) { /* Get the RSDP */ status = acpi_os_get_root_pointer (flags, &rsdp_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 (rsdp_address.pointer.physical, sizeof (struct rsdp_descriptor), (void *) &acpi_gbl_RSDP); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } } else { acpi_gbl_RSDP = rsdp_address.pointer.logical; } /* * The signature and checksum must both be correct */ if (ACPI_STRNCMP ((char *) acpi_gbl_RSDP, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) { /* Nope, BAD Signature */ return_ACPI_STATUS (AE_BAD_SIGNATURE); } if (acpi_tb_checksum (acpi_gbl_RSDP, ACPI_RSDP_CHECKSUM_LENGTH) != 0) { /* Nope, BAD Checksum */ return_ACPI_STATUS (AE_BAD_CHECKSUM); } } /* Get the RSDT and validate it */ 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; status = acpi_tb_get_table (&address, &rsdt_info); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } status = acpi_tb_validate_rsdt (rsdt_info.pointer); if (ACPI_FAILURE (status)) { 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 */ if (acpi_gbl_RSDP->revision < 2) { 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: acpi_os_unmap_memory (rsdt_info.pointer, (acpi_size) rsdt_info.pointer->length); return_ACPI_STATUS (status); } /* TBD: Move to a new file */ #if ACPI_MACHINE_WIDTH != 16 /******************************************************************************* * * FUNCTION: acpi_find_root_pointer * * PARAMETERS: **rsdp_address - Where to place the RSDP address * Flags - Logical/Physical addressing * * 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_DEBUG_PRINT ((ACPI_DB_ERROR, "RSDP structure not found, %s Flags=%X\n", acpi_format_exception (status), 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 * ******************************************************************************/ u8 * acpi_tb_scan_memory_for_rsdp ( u8 *start_address, u32 length) { u32 offset; u8 *mem_rover; ACPI_FUNCTION_TRACE ("tb_scan_memory_for_rsdp"); /* Search from given start addr for the requested length */ for (offset = 0, mem_rover = start_address; offset < length; offset += ACPI_RSDP_SCAN_STEP, mem_rover += ACPI_RSDP_SCAN_STEP) { /* The signature and checksum must both be correct */ if (ACPI_STRNCMP ((char *) mem_rover, RSDP_SIG, sizeof (RSDP_SIG)-1) == 0 && acpi_tb_checksum (mem_rover, ACPI_RSDP_CHECKSUM_LENGTH) == 0) { /* If so, we have found the RSDP */ ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "RSDP located at physical address %p\n",mem_rover)); return_PTR (mem_rover); } } /* Searched entire block, no RSDP was found */ ACPI_DEBUG_PRINT ((ACPI_DB_INFO,"Searched entire block, no RSDP was found.\n")); 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 * * DESCRIPTION: search lower 1_mbyte of memory for the root system descriptor * pointer structure. If it is found, set *RSDP to point to it. * * NOTE: The RSDp must be either in the first 1_k of the Extended * BIOS Data Area or between E0000 and FFFFF (ACPI 1.0 section * 5.2.2; assertion #421). * ******************************************************************************/ acpi_status acpi_tb_find_rsdp ( struct acpi_table_desc *table_info, u32 flags) { u8 *table_ptr; u8 *mem_rover; u64 phys_addr; acpi_status status = AE_OK; ACPI_FUNCTION_TRACE ("tb_find_rsdp"); /* * Scan supports either 1) Logical addressing or 2) Physical addressing */ if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) { /* * 1) Search EBDA (low memory) paragraphs */ status = acpi_os_map_memory ((u64) ACPI_LO_RSDP_WINDOW_BASE, ACPI_LO_RSDP_WINDOW_SIZE, (void *) &table_ptr); if (ACPI_FAILURE (status)) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %X for length %X\n", ACPI_LO_RSDP_WINDOW_BASE, ACPI_LO_RSDP_WINDOW_SIZE)); return_ACPI_STATUS (status); } mem_rover = acpi_tb_scan_memory_for_rsdp (table_ptr, ACPI_LO_RSDP_WINDOW_SIZE); acpi_os_unmap_memory (table_ptr, ACPI_LO_RSDP_WINDOW_SIZE); if (mem_rover) { /* Found it, return the physical address */ phys_addr = ACPI_LO_RSDP_WINDOW_BASE; phys_addr += ACPI_PTR_DIFF (mem_rover,table_ptr); table_info->physical_address = phys_addr; return_ACPI_STATUS (AE_OK); } /* * 2) Search upper memory: 16-byte boundaries in E0000h-F0000h */ status = acpi_os_map_memory ((u64) ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE, (void *) &table_ptr); if (ACPI_FAILURE (status)) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %X for length %X\n", 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) { /* Found it, return the physical address */ phys_addr = ACPI_HI_RSDP_WINDOW_BASE; phys_addr += ACPI_PTR_DIFF (mem_rover, table_ptr); table_info->physical_address = phys_addr; return_ACPI_STATUS (AE_OK); } } /* * Physical addressing */ else { /* * 1) Search EBDA (low memory) paragraphs */ mem_rover = acpi_tb_scan_memory_for_rsdp (ACPI_PHYSADDR_TO_PTR (ACPI_LO_RSDP_WINDOW_BASE), ACPI_LO_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); } /* * 2) Search upper memory: 16-byte boundaries in E0000h-F0000h */ 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); } } /* RSDP signature was not found */ return_ACPI_STATUS (AE_NOT_FOUND); } #endif
Go to most recent revision | Compare with Previous | Blame | View Log