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ACPICA: Allow OS override of all ACPI tables

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Previously, the table override mechanism was implemented for the
DSDT only. Now, any table in the RSDT/XSDT can be replaced by
the host OS. (including the DSDT).

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2009-02-03 14:35:25 +08:00 committed by Len Brown
parent 4bbfb85da2
commit ac5f98db7b
4 changed files with 50 additions and 46 deletions
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1
drivers/acpi/acpica/acglobal.h
View File

@ -371,7 +371,6 @@ ACPI_EXTERN char *acpi_gbl_db_buffer;
ACPI_EXTERN char *acpi_gbl_db_filename; ACPI_EXTERN char *acpi_gbl_db_filename;
ACPI_EXTERN u32 acpi_gbl_db_debug_level; ACPI_EXTERN u32 acpi_gbl_db_debug_level;
ACPI_EXTERN u32 acpi_gbl_db_console_debug_level; ACPI_EXTERN u32 acpi_gbl_db_console_debug_level;
ACPI_EXTERN struct acpi_table_header *acpi_gbl_db_table_ptr;
ACPI_EXTERN struct acpi_namespace_node *acpi_gbl_db_scope_node; ACPI_EXTERN struct acpi_namespace_node *acpi_gbl_db_scope_node;
/* /*

59
drivers/acpi/acpica/tbutils.c
View File

@ -287,7 +287,10 @@ u8 acpi_tb_checksum(u8 *buffer, u32 length)
* *
* RETURN: None * RETURN: None
* *
* DESCRIPTION: Install an ACPI table into the global data structure. * DESCRIPTION: Install an ACPI table into the global data structure. The
* table override mechanism is implemented here to allow the host
* OS to replace any table before it is installed in the root
* table array.
* *
******************************************************************************/ ******************************************************************************/
@ -295,7 +298,10 @@ void
acpi_tb_install_table(acpi_physical_address address, acpi_tb_install_table(acpi_physical_address address,
u8 flags, char *signature, u32 table_index) u8 flags, char *signature, u32 table_index)
{ {
struct acpi_table_header *table; acpi_status status;
struct acpi_table_header *table_to_install;
struct acpi_table_header *mapped_table;
struct acpi_table_header *override_table = NULL;
if (!address) { if (!address) {
ACPI_ERROR((AE_INFO, ACPI_ERROR((AE_INFO,
@ -306,41 +312,68 @@ acpi_tb_install_table(acpi_physical_address address,
/* Map just the table header */ /* Map just the table header */
table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); mapped_table =
if (!table) { acpi_os_map_memory(address, sizeof(struct acpi_table_header));
if (!mapped_table) {
return; return;
} }
/* If a particular signature is expected, signature must match */ /* If a particular signature is expected (DSDT/FACS), it must match */
if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) { if (signature && !ACPI_COMPARE_NAME(mapped_table->signature, signature)) {
ACPI_ERROR((AE_INFO, ACPI_ERROR((AE_INFO,
"Invalid signature 0x%X for ACPI table [%s]", "Invalid signature 0x%X for ACPI table, expected [%s]",
*ACPI_CAST_PTR(u32, table->signature), signature)); *ACPI_CAST_PTR(u32, mapped_table->signature),
signature));
goto unmap_and_exit; goto unmap_and_exit;
} }
/*
* ACPI Table Override:
*
* Before we install the table, let the host OS override it with a new
* one if desired. Any table within the RSDT/XSDT can be replaced,
* including the DSDT which is pointed to by the FADT.
*/
status = acpi_os_table_override(mapped_table, &override_table);
if (ACPI_SUCCESS(status) && override_table) {
ACPI_INFO((AE_INFO,
"%4.4s @ 0x%p Table override, replaced with:",
mapped_table->signature, ACPI_CAST_PTR(void,
address)));
acpi_gbl_root_table_list.tables[table_index].pointer =
override_table;
flags = ACPI_TABLE_ORIGIN_OVERRIDE;
address = ACPI_PTR_TO_PHYSADDR(override_table);
table_to_install = override_table;
} else {
table_to_install = mapped_table;
}
/* Initialize the table entry */ /* Initialize the table entry */
acpi_gbl_root_table_list.tables[table_index].address = address; acpi_gbl_root_table_list.tables[table_index].address = address;
acpi_gbl_root_table_list.tables[table_index].length = table->length; acpi_gbl_root_table_list.tables[table_index].length =
table_to_install->length;
acpi_gbl_root_table_list.tables[table_index].flags = flags; acpi_gbl_root_table_list.tables[table_index].flags = flags;
ACPI_MOVE_32_TO_32(& ACPI_MOVE_32_TO_32(&
(acpi_gbl_root_table_list.tables[table_index]. (acpi_gbl_root_table_list.tables[table_index].
signature), table->signature); signature), table_to_install->signature);
acpi_tb_print_table_header(address, table); acpi_tb_print_table_header(address, table_to_install);
if (table_index == ACPI_TABLE_INDEX_DSDT) { if (table_index == ACPI_TABLE_INDEX_DSDT) {
/* Global integer width is based upon revision of the DSDT */ /* Global integer width is based upon revision of the DSDT */
acpi_ut_set_integer_width(table->revision); acpi_ut_set_integer_width(table_to_install->revision);
} }
unmap_and_exit: unmap_and_exit:
acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); acpi_os_unmap_memory(mapped_table, sizeof(struct acpi_table_header));
} }
/******************************************************************************* /*******************************************************************************

31
drivers/acpi/acpica/tbxface.c
View File

@ -491,7 +491,6 @@ ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
static acpi_status acpi_tb_load_namespace(void) static acpi_status acpi_tb_load_namespace(void)
{ {
acpi_status status; acpi_status status;
struct acpi_table_header *table;
u32 i; u32 i;
ACPI_FUNCTION_TRACE(tb_load_namespace); ACPI_FUNCTION_TRACE(tb_load_namespace);
@ -515,41 +514,13 @@ static acpi_status acpi_tb_load_namespace(void)
goto unlock_and_exit; goto unlock_and_exit;
} }
/* /* A valid DSDT is required */
* Find DSDT table
*/
status =
acpi_os_table_override(acpi_gbl_root_table_list.
tables[ACPI_TABLE_INDEX_DSDT].pointer,
&table);
if (ACPI_SUCCESS(status) && table) {
/*
* DSDT table has been found
*/
acpi_tb_delete_table(&acpi_gbl_root_table_list.
tables[ACPI_TABLE_INDEX_DSDT]);
acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer =
table;
acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].length =
table->length;
acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].flags =
ACPI_TABLE_ORIGIN_UNKNOWN;
ACPI_INFO((AE_INFO, "Table DSDT replaced by host OS"));
acpi_tb_print_table_header(0, table);
if (no_auto_ssdt == 0) {
printk(KERN_WARNING "ACPI: DSDT override uses original SSDTs unless \"acpi_no_auto_ssdt\"\n");
}
}
status = status =
acpi_tb_verify_table(&acpi_gbl_root_table_list. acpi_tb_verify_table(&acpi_gbl_root_table_list.
tables[ACPI_TABLE_INDEX_DSDT]); tables[ACPI_TABLE_INDEX_DSDT]);
if (ACPI_FAILURE(status)) { if (ACPI_FAILURE(status)) {
/* A valid DSDT is required */
status = AE_NO_ACPI_TABLES; status = AE_NO_ACPI_TABLES;
goto unlock_and_exit; goto unlock_and_exit;
} }

5
include/acpi/actbl.h
View File

@ -310,8 +310,9 @@ struct acpi_table_desc {
#define ACPI_TABLE_ORIGIN_UNKNOWN (0) #define ACPI_TABLE_ORIGIN_UNKNOWN (0)
#define ACPI_TABLE_ORIGIN_MAPPED (1) #define ACPI_TABLE_ORIGIN_MAPPED (1)
#define ACPI_TABLE_ORIGIN_ALLOCATED (2) #define ACPI_TABLE_ORIGIN_ALLOCATED (2)
#define ACPI_TABLE_ORIGIN_MASK (3) #define ACPI_TABLE_ORIGIN_OVERRIDE (4)
#define ACPI_TABLE_IS_LOADED (4) #define ACPI_TABLE_ORIGIN_MASK (7)
#define ACPI_TABLE_IS_LOADED (8)
/* /*
* Get the remaining ACPI tables * Get the remaining ACPI tables