From 69ec87efa815d69140423014bb5f91e034faac22 Mon Sep 17 00:00:00 2001 From: Lin Ming Date: Thu, 1 Apr 2010 11:14:12 +0800 Subject: ACPICA: Add subsystem option to force copy of DSDT to local memory Optionally copy the entire DSDT to local memory (instead of simply mapping it.) There are some BIOSs that corrupt or replace the original DSDT, creating the need for this option. Default is FALSE, do not copy the DSDT. https://bugzilla.kernel.org/show_bug.cgi?id=14679 Signed-off-by: Lin Ming Signed-off-by: Bob Moore Signed-off-by: Len Brown --- drivers/acpi/acpica/acglobal.h | 8 ++++++++ drivers/acpi/acpica/actables.h | 2 ++ drivers/acpi/acpica/psxface.c | 1 + drivers/acpi/acpica/tbutils.c | 35 +++++++++++++++++++++++++++++++++++ drivers/acpi/acpica/tbxface.c | 10 ++++++++++ include/acpi/acpixf.h | 1 + 6 files changed, 57 insertions(+) diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h index a419fe98a5f..e3813d290b4 100644 --- a/drivers/acpi/acpica/acglobal.h +++ b/drivers/acpi/acpica/acglobal.h @@ -117,6 +117,14 @@ u8 ACPI_INIT_GLOBAL(acpi_gbl_use_default_register_widths, TRUE); */ u8 ACPI_INIT_GLOBAL(acpi_gbl_enable_aml_debug_object, FALSE); +/* + * Optionally copy the entire DSDT to local memory (instead of simply + * mapping it.) There are some BIOSs that corrupt or replace the original + * DSDT, creating the need for this option. Default is FALSE, do not copy + * the DSDT. + */ +u8 ACPI_INIT_GLOBAL(acpi_gbl_copy_dsdt_locally, FALSE); + /* acpi_gbl_FADT is a local copy of the FADT, converted to a common format. */ struct acpi_table_fadt acpi_gbl_FADT; diff --git a/drivers/acpi/acpica/actables.h b/drivers/acpi/acpica/actables.h index fc52b6f2d69..b7197bf4af0 100644 --- a/drivers/acpi/acpica/actables.h +++ b/drivers/acpi/acpica/actables.h @@ -109,6 +109,8 @@ acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length); void acpi_tb_check_dsdt_header(void); +void acpi_tb_copy_dsdt(struct acpi_table_desc *table_desc); + void acpi_tb_install_table(acpi_physical_address address, char *signature, u32 table_index); diff --git a/drivers/acpi/acpica/psxface.c b/drivers/acpi/acpica/psxface.c index 67e7ad51705..c42f067cff9 100644 --- a/drivers/acpi/acpica/psxface.c +++ b/drivers/acpi/acpica/psxface.c @@ -46,6 +46,7 @@ #include "acparser.h" #include "acdispat.h" #include "acinterp.h" +#include "actables.h" #include "amlcode.h" #define _COMPONENT ACPI_PARSER diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c index 07bc7437f82..1efb0940e8b 100644 --- a/drivers/acpi/acpica/tbutils.c +++ b/drivers/acpi/acpica/tbutils.c @@ -385,6 +385,41 @@ void acpi_tb_check_dsdt_header(void) } } +/******************************************************************************* + * + * FUNCTION: acpi_tb_copy_dsdt + * + * PARAMETERS: table_desc - Installed table to copy + * + * RETURN: None + * + * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. + * Some very bad BIOSs are known to either corrupt the DSDT or + * install a new, bad DSDT. This copy works around the problem. + * + ******************************************************************************/ + +void acpi_tb_copy_dsdt(struct acpi_table_desc *table_desc) +{ + struct acpi_table_header *new_table; + + new_table = ACPI_ALLOCATE(table_desc->length); + if (!new_table) { + ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X", + table_desc->length)); + return; + } + + ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length); + acpi_tb_delete_table(table_desc); + table_desc->pointer = new_table; + table_desc->flags = ACPI_TABLE_ORIGIN_ALLOCATED; + + ACPI_INFO((AE_INFO, + "Forced DSDT copy: length 0x%05X copied locally, original unmapped", + new_table->length)); +} + /******************************************************************************* * * FUNCTION: acpi_tb_install_table diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c index 30565100b94..f5378fc302b 100644 --- a/drivers/acpi/acpica/tbxface.c +++ b/drivers/acpi/acpica/tbxface.c @@ -531,6 +531,16 @@ static acpi_status acpi_tb_load_namespace(void) goto unlock_and_exit; } + /* + * Optionally copy the entire DSDT to local memory (instead of simply + * mapping it.) There are some BIOSs that corrupt or replace the original + * DSDT, creating the need for this option. Default is FALSE, do not copy + * the DSDT. + */ + if (acpi_gbl_copy_dsdt_locally) { + acpi_tb_copy_dsdt(acpi_gbl_DSDT); + } + /* * Save the original DSDT header for detection of table corruption * and/or replacement of the DSDT from outside the OS. diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h index f753222d5cf..fd815f60542 100644 --- a/include/acpi/acpixf.h +++ b/include/acpi/acpixf.h @@ -68,6 +68,7 @@ extern u8 acpi_gbl_use_default_register_widths; extern acpi_name acpi_gbl_trace_method_name; extern u32 acpi_gbl_trace_flags; extern u8 acpi_gbl_enable_aml_debug_object; +extern u8 acpi_gbl_copy_dsdt_locally; extern u32 acpi_current_gpe_count; extern struct acpi_table_fadt acpi_gbl_FADT; -- cgit v1.2.3-70-g09d2