Commit f7b004a1 authored by Bob Moore's avatar Bob Moore Committed by Len Brown

ACPICA: Add acpi_os_physical_table_override interface

This interface allows the host to override a table via a
physical address, instead of the logical address required by
acpi_os_table_override. This simplifies the host implementation.
Initial implementation by Thomas Renninger. ACPICA implementation
creates a single function for table overrides that attempts both
a logical and a physical override.
Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: Thomas Renninger's avatarThomas Renninger <trenn@suse.de>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent ea143604
......@@ -67,6 +67,11 @@ acpi_status acpi_tb_resize_root_table_list(void);
acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc);
struct acpi_table_header *acpi_tb_table_override(struct acpi_table_header
*table_header,
struct acpi_table_desc
*table_desc);
acpi_status
acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index);
......
......@@ -114,7 +114,6 @@ 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);
......@@ -224,25 +223,10 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
/*
* ACPI Table Override:
* Allow the host to override dynamically loaded tables.
* NOTE: the table is fully mapped at this point, and the mapping will
* be deleted by tb_table_override if the table is actually overridden.
*/
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;
}
(void)acpi_tb_table_override(table_desc->pointer, table_desc);
/* Add the table to the global root table list */
......@@ -261,6 +245,95 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_table_override
*
* PARAMETERS: table_header - Header for the original table
* table_desc - Table descriptor initialized for the
* original table. May or may not be mapped.
*
* RETURN: Pointer to the entire new table. NULL if table not overridden.
* If overridden, installs the new table within the input table
* descriptor.
*
* DESCRIPTION: Attempt table override by calling the OSL override functions.
* Note: If the table is overridden, then the entire new table
* is mapped and returned by this function.
*
******************************************************************************/
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);
}
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_CAST_PTR(void, 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);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_resize_root_table_list
......@@ -396,7 +469,11 @@ void acpi_tb_delete_table(struct acpi_table_desc *table_desc)
case ACPI_TABLE_ORIGIN_ALLOCATED:
ACPI_FREE(table_desc->pointer);
break;
default:;
/* Not mapped or allocated, there is nothing we can do */
default:
return;
}
table_desc->pointer = NULL;
......
......@@ -446,7 +446,7 @@ struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
* RETURN: None
*
* DESCRIPTION: Install an ACPI table into the global data structure. The
* table override mechanism is implemented here to allow the host
* table override mechanism is called to allow the host
* OS to replace any table before it is installed in the root
* table array.
*
......@@ -456,11 +456,9 @@ void
acpi_tb_install_table(acpi_physical_address address,
char *signature, u32 table_index)
{
u8 flags;
acpi_status status;
struct acpi_table_header *table_to_install;
struct acpi_table_header *mapped_table;
struct acpi_table_header *override_table = NULL;
struct acpi_table_header *table;
struct acpi_table_header *final_table;
struct acpi_table_desc *table_desc;
if (!address) {
ACPI_ERROR((AE_INFO,
......@@ -471,69 +469,78 @@ acpi_tb_install_table(acpi_physical_address address,
/* Map just the table header */
mapped_table =
acpi_os_map_memory(address, sizeof(struct acpi_table_header));
if (!mapped_table) {
table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
if (!table) {
ACPI_ERROR((AE_INFO,
"Could not map memory for table [%s] at %p",
signature, ACPI_CAST_PTR(void, address)));
return;
}
/* If a particular signature is expected (DSDT/FACS), it must match */
if (signature && !ACPI_COMPARE_NAME(mapped_table->signature, signature)) {
if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
ACPI_ERROR((AE_INFO,
"Invalid signature 0x%X for ACPI table, expected [%s]",
*ACPI_CAST_PTR(u32, mapped_table->signature),
signature));
*ACPI_CAST_PTR(u32, table->signature), signature));
goto unmap_and_exit;
}
/*
* Initialize the table entry. Set the pointer to NULL, since the
* table is not fully mapped at this time.
*/
table_desc = &acpi_gbl_root_table_list.tables[table_index];
table_desc->address = address;
table_desc->pointer = NULL;
table_desc->length = table->length;
table_desc->flags = ACPI_TABLE_ORIGIN_MAPPED;
ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature);
/*
* 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.
*
* NOTE: If the table is overridden, then final_table will contain a
* mapped pointer to the full new table. If the table is not overridden,
* or if there has been a physical override, then the table will be
* fully mapped later (in verify table). In any case, we must
* unmap the header that was mapped above.
*/
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;
address = ACPI_PTR_TO_PHYSADDR(override_table);
table_to_install = override_table;
flags = ACPI_TABLE_ORIGIN_OVERRIDE;
} else {
table_to_install = mapped_table;
flags = ACPI_TABLE_ORIGIN_MAPPED;
final_table = acpi_tb_table_override(table, table_desc);
if (!final_table) {
final_table = table; /* There was no override */
}
/* Initialize the table entry */
acpi_tb_print_table_header(table_desc->address, final_table);
acpi_gbl_root_table_list.tables[table_index].address = address;
acpi_gbl_root_table_list.tables[table_index].length =
table_to_install->length;
acpi_gbl_root_table_list.tables[table_index].flags = flags;
ACPI_MOVE_32_TO_32(&
(acpi_gbl_root_table_list.tables[table_index].
signature), table_to_install->signature);
acpi_tb_print_table_header(address, table_to_install);
/* Set the global integer width (based upon revision of the DSDT) */
if (table_index == ACPI_TABLE_INDEX_DSDT) {
acpi_ut_set_integer_width(final_table->revision);
}
/* Global integer width is based upon revision of the DSDT */
acpi_ut_set_integer_width(table_to_install->revision);
/*
* If we have a physical override during this early loading of the ACPI
* tables, unmap the table for now. It will be mapped again later when
* it is actually used. This supports very early loading of ACPI tables,
* before virtual memory is fully initialized and running within the
* host OS. Note: A logical override has the ACPI_TABLE_ORIGIN_OVERRIDE
* flag set and will not be deleted below.
*/
if (final_table != table) {
acpi_tb_delete_table(table_desc);
}
unmap_and_exit:
acpi_os_unmap_memory(mapped_table, sizeof(struct acpi_table_header));
/* Always unmap the table header that we mapped above */
acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
}
/*******************************************************************************
......
......@@ -554,6 +554,15 @@ acpi_os_table_override(struct acpi_table_header * existing_table,
return AE_OK;
}
acpi_status
acpi_os_physical_table_override(struct acpi_table_header *existing_table,
acpi_physical_address * new_address,
u32 *new_table_length)
{
return AE_SUPPORT;
}
static irqreturn_t acpi_irq(int irq, void *dev_id)
{
u32 handled;
......
......@@ -95,6 +95,11 @@ acpi_status
acpi_os_table_override(struct acpi_table_header *existing_table,
struct acpi_table_header **new_table);
acpi_status
acpi_os_physical_table_override(struct acpi_table_header *existing_table,
acpi_physical_address * new_address,
u32 *new_table_length);
/*
* Spinlock primitives
*/
......
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