[PATCH 2/4] ACPICA: Introduce new acpi_os_physical_table_add OS callback

Thomas Renninger
2014-02-18T18:23:35Z

This one allows OS to add arbitrary ACPI tables.

ToDo: It should get checked whether a table with the same signature already
exists and if this is the case, adding should not happen.

Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: hpa@zytor.com
CC: tglx@linutronix.de
CC: ck@conrad-kostecki.de
CC: linux-kernel@vger.kernel.org
CC: x86@kernel.org
CC: mingo@redhat.com
CC: rjw@rjwysocki.net
CC: devel@acpica.org
---
drivers/acpi/acpica/tbutils.c | 24 ++++++++++++++++++++++++
include/acpi/acpiosxf.h | 6 ++++++
2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 6412d3c..c763816 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -453,6 +453,8 @@ static acpi_status acpi_tb_validate_xsdt(acpi_physical_address xsdt_address)
*
******************************************************************************/

+#define ACPI_MAX_TABLE_ADD 64
+
acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
{
struct acpi_table_rsdp *rsdp;
@@ -623,5 +625,27 @@ acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
}
}

+ /*
+ * ACPI Table Add:
+ * Allow the OS to add additional tables to the global root table list
+ */
+ for (i = 0; i < ACPI_MAX_TABLE_ADD; i++) {
+ int tmp;
+ table_entry_size = 0;
+ address = 0;
+ status = acpi_os_physical_table_add(&address,
+ &table_entry_size);
+ if (status == AE_OK && table_entry_size && address) {
+ table = acpi_os_map_memory(address, table_entry_size);
+ ACPI_INFO((AE_INFO, "Add OS provided table:"));
+ acpi_tb_print_table_header(address, table);
+ status = acpi_tb_store_table(address,
+ table,
+ table_entry_size,
+ ACPI_TABLE_ORIGIN_MAPPED,
+ &tmp);
+ } else
+ break;
+ }
return_ACPI_STATUS(AE_OK);
}
diff --git a/include/acpi/acpiosxf.h b/include/acpi/acpiosxf.h
index 01e6c6d..70c00ed 100644
--- a/include/acpi/acpiosxf.h
+++ b/include/acpi/acpiosxf.h
@@ -111,6 +111,12 @@ acpi_os_physical_table_override(struct acpi_table_header *existing_table,
u32 *new_table_length);
#endif

+#ifndef ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_physical_table_add
+acpi_status
+acpi_os_physical_table_add(acpi_physical_address * new_address,
+ u32 *new_table_length);
+#endif
+
/*
* Spinlock primitives
*/
--
1.7.6.1