X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Facpi%2Ftables%2Ftbxfroot.c;h=6e8072ebbac67aef3791b2bfaf774d00e03f053d;hb=6a77f38946aaee1cd85eeec6cf4229b204c15071;hp=b7328345d9896cd829b8b85c316b19f75b6cf4a3;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git diff --git a/drivers/acpi/tables/tbxfroot.c b/drivers/acpi/tables/tbxfroot.c index b7328345d..6e8072ebb 100644 --- a/drivers/acpi/tables/tbxfroot.c +++ b/drivers/acpi/tables/tbxfroot.c @@ -5,7 +5,7 @@ *****************************************************************************/ /* - * Copyright (C) 2000 - 2004, R. Byron Moore + * Copyright (C) 2000 - 2005, R. Byron Moore * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -41,6 +41,7 @@ * POSSIBILITY OF SUCH DAMAGES. */ +#include #include #include @@ -87,21 +88,40 @@ acpi_tb_find_table ( return_ACPI_STATUS (AE_AML_STRING_LIMIT); } - /* Find the table */ + 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); + } - status = acpi_get_firmware_table (signature, 1, - ACPI_LOGICAL_ADDRESSING, &table); - if (ACPI_FAILURE (status)) { - return_ACPI_STATUS (status); + 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_STRCMP (oem_id, table->oem_id)) || - (oem_table_id[0] && ACPI_STRCMP (oem_table_id, table->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); } @@ -115,17 +135,14 @@ acpi_tb_find_table ( * 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 + * table_pointer - Where a buffer containing the table is + * returned * * 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. + * 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. * ******************************************************************************/ @@ -136,12 +153,11 @@ acpi_get_firmware_table ( 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; + 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; @@ -152,45 +168,41 @@ 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 + * 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) || + if ((instance == 0) || + (!signature) || (!table_pointer)) { return_ACPI_STATUS (AE_BAD_PARAMETER); } - rsdt_info.pointer = NULL; + /* Ensure that we have a RSDP */ if (!acpi_gbl_RSDP) { /* Get the RSDP */ - status = acpi_os_get_root_pointer (flags, &rsdp_address); + status = acpi_os_get_root_pointer (flags, &address); if (ACPI_FAILURE (status)) { - ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "RSDP not found\n")); + 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), + 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 = rsdp_address.pointer.logical; + acpi_gbl_RSDP = address.pointer.logical; } - /* - * The signature and checksum must both be correct - */ + /* 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 */ @@ -204,10 +216,9 @@ acpi_get_firmware_table ( } } - /* Get the RSDT and validate it */ + /* 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, @@ -217,20 +228,40 @@ acpi_get_firmware_table ( address.pointer_type |= flags; - status = acpi_tb_get_table (&address, &rsdt_info); + /* 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)) { - return_ACPI_STATUS (status); + goto cleanup; } - status = acpi_tb_validate_rsdt (rsdt_info.pointer); + status = acpi_tb_validate_rsdt (rsdt_info->pointer); if (ACPI_FAILURE (status)) { goto cleanup; } - /* Get the number of table pointers within the RSDT */ + /* 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_count = acpi_tb_get_table_count (acpi_gbl_RSDP, rsdt_info.pointer); + 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; /* @@ -241,35 +272,36 @@ acpi_get_firmware_table ( /* 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]; + 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]; + 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); + 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)) { + 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); + status = acpi_tb_get_table_body (&address, header, table_info); if (ACPI_FAILURE (status)) { goto cleanup; } - *table_pointer = table_info.pointer; + *table_pointer = table_info->pointer; goto cleanup; } } @@ -281,9 +313,18 @@ acpi_get_firmware_table ( cleanup: - acpi_os_unmap_memory (rsdt_info.pointer, (acpi_size) rsdt_info.pointer->length); + 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 */ @@ -319,7 +360,8 @@ acpi_find_root_pointer ( 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_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); } @@ -348,35 +390,58 @@ acpi_tb_scan_memory_for_rsdp ( u8 *start_address, u32 length) { - u32 offset; u8 *mem_rover; + u8 *end_address; + u8 checksum; ACPI_FUNCTION_TRACE ("tb_scan_memory_for_rsdp"); - /* Search from given start addr for the requested length */ + end_address = start_address + length; - for (offset = 0, mem_rover = start_address; - offset < length; - offset += ACPI_RSDP_SCAN_STEP, mem_rover += ACPI_RSDP_SCAN_STEP) { + /* 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 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 */ + if (ACPI_STRNCMP ((char *) mem_rover, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) { + /* No signature match, keep looking */ + + continue; + } + + /* Signature matches, check the appropriate checksum */ + + if ((ACPI_CAST_PTR (struct rsdp_descriptor, mem_rover))->revision < 2) { + /* ACPI version 1.0 */ + + checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_CHECKSUM_LENGTH); + } + else { + /* Post ACPI 1.0, use extended_checksum */ + + checksum = acpi_tb_checksum (mem_rover, ACPI_RSDP_XCHECKSUM_LENGTH); + } + + if (checksum == 0) { + /* Checksum valid, we have found a valid RSDP */ ACPI_DEBUG_PRINT ((ACPI_DB_INFO, - "RSDP located at physical address %p\n",mem_rover)); + "RSDP located at physical address %p\n", mem_rover)); return_PTR (mem_rover); } + + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Found an RSDP at physical address %p, but it has a bad checksum\n", + mem_rover)); } /* Searched entire block, no RSDP was found */ - ACPI_DEBUG_PRINT ((ACPI_DB_INFO,"Searched entire block, no RSDP was found.\n")); + ACPI_DEBUG_PRINT ((ACPI_DB_INFO, + "Searched entire block, no valid RSDP was found.\n")); return_PTR (NULL); } @@ -389,14 +454,17 @@ acpi_tb_scan_memory_for_rsdp ( * Flags - Current memory mode (logical vs. * physical addressing) * - * RETURN: Status + * 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. * - * 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). + * 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. * ******************************************************************************/ @@ -407,8 +475,8 @@ acpi_tb_find_rsdp ( { u8 *table_ptr; u8 *mem_rover; - u64 phys_addr; - acpi_status status = AE_OK; + u32 physical_address; + acpi_status status; ACPI_FUNCTION_TRACE ("tb_find_rsdp"); @@ -419,36 +487,60 @@ acpi_tb_find_rsdp ( */ if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) { /* - * 1) Search EBDA (low memory) paragraphs + * 1a) Get the location of the EBDA */ - status = acpi_os_map_memory ((u64) ACPI_LO_RSDP_WINDOW_BASE, ACPI_LO_RSDP_WINDOW_SIZE, + status = acpi_os_map_memory ((acpi_physical_address) ACPI_EBDA_PTR_LOCATION, + ACPI_EBDA_PTR_LENGTH, (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)); + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Could not map memory at %8.8X for length %X\n", + ACPI_EBDA_PTR_LOCATION, ACPI_EBDA_PTR_LENGTH)); 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); + ACPI_MOVE_16_TO_32 (&physical_address, table_ptr); + physical_address <<= 4; /* Convert segment to physical address */ + acpi_os_unmap_memory (table_ptr, ACPI_EBDA_PTR_LENGTH); - if (mem_rover) { - /* Found it, return the physical address */ + /* EBDA present? */ - phys_addr = ACPI_LO_RSDP_WINDOW_BASE; - phys_addr += ACPI_PTR_DIFF (mem_rover,table_ptr); + 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_DEBUG_PRINT ((ACPI_DB_ERROR, + "Could not map memory at %8.8X for length %X\n", + physical_address, ACPI_EBDA_WINDOW_SIZE)); + return_ACPI_STATUS (status); + } - table_info->physical_address = phys_addr; - return_ACPI_STATUS (AE_OK); + 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) { + /* Found it, 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-F0000h + * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh */ - status = acpi_os_map_memory ((u64) ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE, + 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_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not map memory at %X for length %X\n", + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Could not map memory at %8.8X for length %X\n", ACPI_HI_RSDP_WINDOW_BASE, ACPI_HI_RSDP_WINDOW_SIZE)); return_ACPI_STATUS (status); } @@ -459,10 +551,9 @@ acpi_tb_find_rsdp ( 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); + physical_address = ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (mem_rover, table_ptr); - table_info->physical_address = phys_addr; + table_info->physical_address = (acpi_physical_address) physical_address; return_ACPI_STATUS (AE_OK); } } @@ -472,19 +563,29 @@ acpi_tb_find_rsdp ( */ else { /* - * 1) Search EBDA (low memory) paragraphs + * 1a) Get the location of the EBDA */ - 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); + 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) { + /* 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 + * 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);