static acpi_status
acpi_tb_table_override (
struct acpi_table_header *header,
struct acpi_table_desc *table_info)
{
struct acpi_table_header *new_table;
acpi_status status;
struct acpi_pointer address;
ACPI_FUNCTION_TRACE ("tb_table_override");
/*
* The OSL will examine the header and decide whether to override this
* table. If it decides to override, a table will be returned in new_table,
* which we will then copy.
*/
status = acpi_os_table_override (header, &new_table);
if (ACPI_FAILURE (status)) {
/* Some severe error from the OSL, but we basically ignore it */
ACPI_REPORT_ERROR (("Could not override ACPI table, %s\n",
acpi_format_exception (status)));
return_ACPI_STATUS (status);
}
if (!new_table) {
/* No table override */
return_ACPI_STATUS (AE_NO_ACPI_TABLES);
}
/*
* We have a new table to override the old one. Get a copy of
* the new one. We know that the new table has a logical pointer.
*/
address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
address.pointer.logical = new_table;
status = acpi_tb_get_this_table (&address, new_table, table_info);
if (ACPI_FAILURE (status)) {
ACPI_REPORT_ERROR (("Could not copy override ACPI table, %s\n",
acpi_format_exception (status)));
return_ACPI_STATUS (status);
}
/* Copy the table info */
ACPI_REPORT_INFO (("Table [%4.4s] replaced by host OS\n",
table_info->pointer->signature));
return_ACPI_STATUS (AE_OK);
}
struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header
*table_header,
struct acpi_table_desc
*table_desc)
{
acpi_status status;
struct acpi_table_header *new_table = NULL;
acpi_physical_address new_address = 0;
u32 new_table_length = 0;
u8 new_flags;
char *override_type;
/* (1) Attempt logical override (returns a logical address) */
status = acpi_os_table_override(table_header, &new_table);
if (ACPI_SUCCESS(status) && new_table) {
new_address = ACPI_PTR_TO_PHYSADDR(new_table);
new_table_length = new_table->length;
new_flags = ACPI_TABLE_ORIGIN_OVERRIDE;
override_type = "Logical";
goto finish_override;
}
/* (2) Attempt physical override (returns a physical address) */
status = acpi_os_physical_table_override(table_header,
&new_address,
&new_table_length);
if (ACPI_SUCCESS(status) && new_address && new_table_length) {
/* Map the entire new table */
new_table = acpi_os_map_memory(new_address, new_table_length);
if (!new_table) {
ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY,
"%4.4s %p Attempted physical table override failed",
table_header->signature,
ACPI_CAST_PTR(void,
table_desc->address)));
return (NULL);
}
acpi_status
acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
{
u32 i;
acpi_status status = AE_OK;
struct acpi_table_header *override_table = NULL;
ACPI_FUNCTION_TRACE(tb_add_table);
if (!table_desc->pointer) {
status = acpi_tb_verify_table(table_desc);
if (ACPI_FAILURE(status) || !table_desc->pointer) {
return_ACPI_STATUS(status);
}
}
/*
* Originally, we checked the table signature for "SSDT" or "PSDT" here.
* Next, we added support for OEMx tables, signature "OEM".
* Valid tables were encountered with a null signature, so we've just
* given up on validating the signature, since it seems to be a waste
* of code. The original code was removed (05/2008).
*/
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
/* Check if table is already registered */
for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
if (!acpi_gbl_root_table_list.tables[i].pointer) {
status =
acpi_tb_verify_table(&acpi_gbl_root_table_list.
tables[i]);
if (ACPI_FAILURE(status)
|| !acpi_gbl_root_table_list.tables[i].pointer) {
continue;
}
}
/*
* Check for a table match on the entire table length,
* not just the header.
*/
if (table_desc->length !=
acpi_gbl_root_table_list.tables[i].length) {
continue;
}
if (ACPI_MEMCMP(table_desc->pointer,
acpi_gbl_root_table_list.tables[i].pointer,
acpi_gbl_root_table_list.tables[i].length)) {
continue;
}
/*
* Note: the current mechanism does not unregister a table if it is
* dynamically unloaded. The related namespace entries are deleted,
* but the table remains in the root table list.
*
* The assumption here is that the number of different tables that
* will be loaded is actually small, and there is minimal overhead
* in just keeping the table in case it is needed again.
*
* If this assumption changes in the future (perhaps on large
* machines with many table load/unload operations), tables will
* need to be unregistered when they are unloaded, and slots in the
* root table list should be reused when empty.
*/
/*
* Table is already registered.
* We can delete the table that was passed as a parameter.
*/
acpi_tb_delete_table(table_desc);
*table_index = i;
if (acpi_gbl_root_table_list.tables[i].
flags & ACPI_TABLE_IS_LOADED) {
/* Table is still loaded, this is an error */
status = AE_ALREADY_EXISTS;
goto release;
} else {
/* Table was unloaded, allow it to be reloaded */
table_desc->pointer =
acpi_gbl_root_table_list.tables[i].pointer;
table_desc->address =
acpi_gbl_root_table_list.tables[i].address;
status = AE_OK;
goto print_header;
}
}
/*
* ACPI Table Override:
* Allow the host to override dynamically loaded tables.
*/
status = acpi_os_table_override(table_desc->pointer, &override_table);
if (ACPI_SUCCESS(status) && override_table) {
ACPI_INFO((AE_INFO,
"%4.4s @ 0x%p Table override, replaced with:",
table_desc->pointer->signature,
ACPI_CAST_PTR(void, table_desc->address)));
/* We can delete the table that was passed as a parameter */
acpi_tb_delete_table(table_desc);
/* Setup descriptor for the new table */
table_desc->address = ACPI_PTR_TO_PHYSADDR(override_table);
table_desc->pointer = override_table;
table_desc->length = override_table->length;
table_desc->flags = ACPI_TABLE_ORIGIN_OVERRIDE;
}
acpi_status
acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
{
u32 i;
acpi_status status = AE_OK;
struct acpi_table_header *override_table = NULL;
ACPI_FUNCTION_TRACE(tb_add_table);
if (!table_desc->pointer) {
status = acpi_tb_verify_table(table_desc);
if (ACPI_FAILURE(status) || !table_desc->pointer) {
return_ACPI_STATUS(status);
}
}
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
if (!acpi_gbl_root_table_list.tables[i].pointer) {
status =
acpi_tb_verify_table(&acpi_gbl_root_table_list.
tables[i]);
if (ACPI_FAILURE(status)
|| !acpi_gbl_root_table_list.tables[i].pointer) {
continue;
}
}
if (table_desc->length !=
acpi_gbl_root_table_list.tables[i].length) {
continue;
}
if (ACPI_MEMCMP(table_desc->pointer,
acpi_gbl_root_table_list.tables[i].pointer,
acpi_gbl_root_table_list.tables[i].length)) {
continue;
}
acpi_tb_delete_table(table_desc);
*table_index = i;
if (acpi_gbl_root_table_list.tables[i].
flags & ACPI_TABLE_IS_LOADED) {
status = AE_ALREADY_EXISTS;
goto release;
} else {
table_desc->pointer =
acpi_gbl_root_table_list.tables[i].pointer;
table_desc->address =
acpi_gbl_root_table_list.tables[i].address;
status = AE_OK;
goto print_header;
}
}
status = acpi_os_table_override(table_desc->pointer, &override_table);
if (ACPI_SUCCESS(status) && override_table) {
ACPI_INFO((AE_INFO,
"%4.4s @ 0x%p Table override, replaced with:",
table_desc->pointer->signature,
ACPI_CAST_PTR(void, table_desc->address)));
acpi_tb_delete_table(table_desc);
table_desc->address = ACPI_PTR_TO_PHYSADDR(override_table);
table_desc->pointer = override_table;
table_desc->length = override_table->length;
table_desc->flags = ACPI_TABLE_ORIGIN_OVERRIDE;
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_load_namespace
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
* the RSDT/XSDT.
*
******************************************************************************/
static acpi_status acpi_tb_load_namespace(void)
{
acpi_status status;
struct acpi_table_header *table;
u32 i;
ACPI_FUNCTION_TRACE(tb_load_namespace);
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
/*
* Load the namespace. The DSDT is required, but any SSDT and PSDT tables
* are optional.
*/
if (!acpi_gbl_root_table_list.count ||
!ACPI_COMPARE_NAME(&
(acpi_gbl_root_table_list.
tables[ACPI_TABLE_INDEX_DSDT].signature),
ACPI_SIG_DSDT)
||
ACPI_FAILURE(acpi_tb_verify_table
(&acpi_gbl_root_table_list.
tables[ACPI_TABLE_INDEX_DSDT]))) {
status = AE_NO_ACPI_TABLES;
goto unlock_and_exit;
}
/*
* 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 =
acpi_tb_verify_table(&acpi_gbl_root_table_list.
tables[ACPI_TABLE_INDEX_DSDT]);
if (ACPI_FAILURE(status)) {
/* A valid DSDT is required */
status = AE_NO_ACPI_TABLES;
goto unlock_and_exit;
}
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
/*
* Load and parse tables.
*/
status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* Load any SSDT or PSDT tables. Note: Loop leaves tables locked
*/
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
if ((!ACPI_COMPARE_NAME
(&(acpi_gbl_root_table_list.tables[i].signature),
ACPI_SIG_SSDT)
&&
!ACPI_COMPARE_NAME(&
(acpi_gbl_root_table_list.tables[i].
signature), ACPI_SIG_PSDT))
||
ACPI_FAILURE(acpi_tb_verify_table
(&acpi_gbl_root_table_list.tables[i]))) {
continue;
}
if (no_auto_ssdt) {
printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
continue;
}
/* Ignore errors while loading tables, get as many as possible */
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
(void)acpi_ns_load_table(i, acpi_gbl_root_node);
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
}
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
return_ACPI_STATUS(status);
}
struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header
*table_header,
struct acpi_table_desc
*table_desc)
{
acpi_status status;
struct acpi_table_header *new_table = NULL;
acpi_physical_address new_address = 0;
u32 new_table_length = 0;
u8 new_flags;
char *override_type;
/* (1) Attempt logical override (returns a logical address) */
status = acpi_os_table_override(table_header, &new_table);
if (ACPI_SUCCESS(status) && new_table) {
new_address = ACPI_PTR_TO_PHYSADDR(new_table);
new_table_length = new_table->length;
new_flags = ACPI_TABLE_ORIGIN_OVERRIDE;
override_type = "Logical";
goto finish_override;
}
/* (2) Attempt physical override (returns a physical address) */
status = acpi_os_physical_table_override(table_header,
&new_address,
&new_table_length);
if (ACPI_SUCCESS(status) && new_address && new_table_length) {
/* Map the entire new table */
new_table = acpi_os_map_memory(new_address, new_table_length);
if (!new_table) {
ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY,
"%4.4s %p Attempted physical table override failed",
table_header->signature,
ACPI_PHYSADDR_TO_PTR(table_desc->address)));
return (NULL);
}
override_type = "Physical";
new_flags = ACPI_TABLE_ORIGIN_MAPPED;
goto finish_override;
}
return (NULL); /* There was no override */
finish_override:
ACPI_INFO((AE_INFO,
"%4.4s %p %s table override, new table: %p",
table_header->signature,
ACPI_PHYSADDR_TO_PTR(table_desc->address),
override_type, new_table));
/* We can now unmap/delete the original table (if fully mapped) */
acpi_tb_delete_table(table_desc);
/* Setup descriptor for the new table */
table_desc->address = new_address;
table_desc->pointer = new_table;
table_desc->length = new_table_length;
table_desc->flags = new_flags;
return (new_table);
}
