X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Facpi%2Ftables%2Ftbutils.c;h=209a401801e3aba9ad3715247c9efe0cc58ca59c;hb=4c90ece249992c7a2e3fc921e5cdb8eb92193067;hp=4b2fbb592f4933cf8b8138efe64f558c194a96fe;hpb=1ee9bed173acd2f505f4e76e69d13cb2b82963e9;p=pandora-kernel.git diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c index 4b2fbb592f49..209a401801e3 100644 --- a/drivers/acpi/tables/tbutils.c +++ b/drivers/acpi/tables/tbutils.c @@ -5,7 +5,7 @@ *****************************************************************************/ /* - * Copyright (C) 2000 - 2005, R. Byron Moore + * Copyright (C) 2000 - 2006, R. Byron Moore * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -71,7 +71,7 @@ acpi_status acpi_tb_is_table_installed(struct acpi_table_desc *new_table_desc) { struct acpi_table_desc *table_desc; - ACPI_FUNCTION_TRACE("tb_is_table_installed"); + ACPI_FUNCTION_TRACE(tb_is_table_installed); /* Get the list descriptor and first table descriptor */ @@ -94,13 +94,13 @@ acpi_status acpi_tb_is_table_installed(struct acpi_table_desc *new_table_desc) new_table_desc->pointer->length) && (!ACPI_MEMCMP - ((const char *)table_desc->pointer, - (const char *)new_table_desc->pointer, - (acpi_size) new_table_desc->pointer->length))) { + (table_desc->pointer, new_table_desc->pointer, + new_table_desc->pointer->length))) { + /* Match: this table is already installed */ ACPI_DEBUG_PRINT((ACPI_DB_TABLES, - "Table [%4.4s] already installed: Rev %X oem_table_id [%8.8s]\n", + "Table [%4.4s] already installed: Rev %X OemTableId [%8.8s]\n", new_table_desc->pointer->signature, new_table_desc->pointer->revision, new_table_desc->pointer-> @@ -145,14 +145,13 @@ acpi_tb_validate_table_header(struct acpi_table_header *table_header) { acpi_name signature; - ACPI_FUNCTION_NAME("tb_validate_table_header"); + ACPI_FUNCTION_ENTRY(); /* Verify that this is a valid address */ if (!acpi_os_readable(table_header, sizeof(struct acpi_table_header))) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Cannot read table header at %p\n", - table_header)); + ACPI_ERROR((AE_INFO, + "Cannot read table header at %p", table_header)); return (AE_BAD_ADDRESS); } @@ -161,12 +160,8 @@ acpi_tb_validate_table_header(struct acpi_table_header *table_header) ACPI_MOVE_32_TO_32(&signature, table_header->signature); if (!acpi_ut_valid_acpi_name(signature)) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Table signature at %p [%p] has invalid characters\n", - table_header, &signature)); - - ACPI_REPORT_WARNING(("Invalid table signature found: [%4.4s]\n", - (char *)&signature)); + ACPI_ERROR((AE_INFO, "Invalid table signature 0x%8.8X", + signature)); ACPI_DUMP_BUFFER(table_header, sizeof(struct acpi_table_header)); @@ -176,11 +171,10 @@ acpi_tb_validate_table_header(struct acpi_table_header *table_header) /* Validate the table length */ if (table_header->length < sizeof(struct acpi_table_header)) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Invalid length in table header %p name %4.4s\n", - table_header, (char *)&signature)); - - ACPI_REPORT_WARNING(("Invalid table header length (0x%X) found\n", (u32) table_header->length)); + ACPI_ERROR((AE_INFO, + "Invalid length 0x%X in table with signature %4.4s", + (u32) table_header->length, + ACPI_CAST_PTR(char, &signature))); ACPI_DUMP_BUFFER(table_header, sizeof(struct acpi_table_header)); @@ -192,69 +186,119 @@ acpi_tb_validate_table_header(struct acpi_table_header *table_header) /******************************************************************************* * - * FUNCTION: acpi_tb_verify_table_checksum + * FUNCTION: acpi_tb_sum_table * - * PARAMETERS: *table_header - ACPI table to verify + * PARAMETERS: Buffer - Buffer to sum + * Length - Size of the buffer * - * RETURN: 8 bit checksum of table + * RETURN: 8 bit sum of buffer * - * DESCRIPTION: Does an 8 bit checksum of table and returns status. A correct - * table should have a checksum of 0. + * DESCRIPTION: Computes an 8 bit sum of the buffer(length) and returns it. * ******************************************************************************/ -acpi_status -acpi_tb_verify_table_checksum(struct acpi_table_header * table_header) +u8 acpi_tb_sum_table(void *buffer, u32 length) +{ + acpi_native_uint i; + u8 sum = 0; + + if (!buffer || !length) { + return (0); + } + + for (i = 0; i < length; i++) { + sum = (u8) (sum + ((u8 *) buffer)[i]); + } + return (sum); +} + +/******************************************************************************* + * + * FUNCTION: acpi_tb_generate_checksum + * + * PARAMETERS: Table - Pointer to a valid ACPI table (with a + * standard ACPI header) + * + * RETURN: 8 bit checksum of buffer + * + * DESCRIPTION: Computes an 8 bit checksum of the table. + * + ******************************************************************************/ + +u8 acpi_tb_generate_checksum(struct acpi_table_header * table) { u8 checksum; - acpi_status status = AE_OK; - ACPI_FUNCTION_TRACE("tb_verify_table_checksum"); + /* Sum the entire table as-is */ - /* Compute the checksum on the table */ + checksum = acpi_tb_sum_table(table, table->length); - checksum = - acpi_tb_generate_checksum(table_header, table_header->length); + /* Subtract off the existing checksum value in the table */ - /* Return the appropriate exception */ + checksum = (u8) (checksum - table->checksum); - if (checksum) { - ACPI_REPORT_WARNING(("Invalid checksum in table [%4.4s] (%02X, sum %02X is not zero)\n", table_header->signature, (u32) table_header->checksum, (u32) checksum)); + /* Compute the final checksum */ - status = AE_BAD_CHECKSUM; - } - return_ACPI_STATUS(status); + checksum = (u8) (0 - checksum); + return (checksum); } /******************************************************************************* * - * FUNCTION: acpi_tb_generate_checksum + * FUNCTION: acpi_tb_set_checksum * - * PARAMETERS: Buffer - Buffer to checksum - * Length - Size of the buffer + * PARAMETERS: Table - Pointer to a valid ACPI table (with a + * standard ACPI header) * - * RETURN: 8 bit checksum of buffer + * RETURN: None. Sets the table checksum field * - * DESCRIPTION: Computes an 8 bit checksum of the buffer(length) and returns it. + * DESCRIPTION: Computes an 8 bit checksum of the table and inserts the + * checksum into the table header. * ******************************************************************************/ -u8 acpi_tb_generate_checksum(void *buffer, u32 length) +void acpi_tb_set_checksum(struct acpi_table_header *table) { - const u8 *limit; - const u8 *rover; - u8 sum = 0; - if (buffer && length) { - /* Buffer and Length are valid */ + table->checksum = acpi_tb_generate_checksum(table); +} + +/******************************************************************************* + * + * FUNCTION: acpi_tb_verify_table_checksum + * + * PARAMETERS: *table_header - ACPI table to verify + * + * RETURN: 8 bit checksum of table + * + * DESCRIPTION: Generates an 8 bit checksum of table and returns and compares + * it to the existing checksum value. + * + ******************************************************************************/ + +acpi_status +acpi_tb_verify_table_checksum(struct acpi_table_header *table_header) +{ + u8 checksum; - limit = (u8 *) buffer + length; + ACPI_FUNCTION_TRACE(tb_verify_table_checksum); - for (rover = buffer; rover < limit; rover++) { - sum = (u8) (sum + *rover); - } + /* Compute the checksum on the table */ + + checksum = acpi_tb_generate_checksum(table_header); + + /* Checksum ok? */ + + if (checksum == table_header->checksum) { + return_ACPI_STATUS(AE_OK); } - return (sum); + + ACPI_WARNING((AE_INFO, + "Incorrect checksum in table [%4.4s] - is %2.2X, should be %2.2X", + table_header->signature, table_header->checksum, + checksum)); + + return_ACPI_STATUS(AE_BAD_CHECKSUM); } #ifdef ACPI_OBSOLETE_FUNCTIONS @@ -273,12 +317,12 @@ u8 acpi_tb_generate_checksum(void *buffer, u32 length) acpi_status acpi_tb_handle_to_object(u16 table_id, - struct acpi_table_desc ** return_table_desc) + struct acpi_table_desc **return_table_desc) { u32 i; struct acpi_table_desc *table_desc; - ACPI_FUNCTION_NAME("tb_handle_to_object"); + ACPI_FUNCTION_NAME(tb_handle_to_object); for (i = 0; i < ACPI_TABLE_MAX; i++) { table_desc = acpi_gbl_table_lists[i].next; @@ -292,8 +336,7 @@ acpi_tb_handle_to_object(u16 table_id, } } - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "table_id=%X does not exist\n", - table_id)); + ACPI_ERROR((AE_INFO, "TableId=%X does not exist", table_id)); return (AE_BAD_PARAMETER); } #endif