1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c
new file mode 100644
index 000000000..0bb15add2
--- /dev/null
+++ b/drivers/acpi/acpica/tbinstal.c
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: tbinstal - ACPI table installation and removal
+ *
+ * Copyright (C) 2000 - 2020, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "actables.h"
+
+#define _COMPONENT          ACPI_TABLES
+ACPI_MODULE_NAME("tbinstal")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_install_table_with_override
+ *
+ * PARAMETERS:  new_table_desc          - New table descriptor to install
+ *              override                - Whether override should be performed
+ *              table_index             - Where the table index is returned
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Install an ACPI table into the global data structure. The
+ *              table override mechanism is called to allow the host
+ *              OS to replace any table before it is installed in the root
+ *              table array.
+ *
+ ******************************************************************************/
+void
+acpi_tb_install_table_with_override(struct acpi_table_desc *new_table_desc,
+				    u8 override, u32 *table_index)
+{
+	u32 i;
+	acpi_status status;
+
+	status = acpi_tb_get_next_table_descriptor(&i, NULL);
+	if (ACPI_FAILURE(status)) {
+		return;
+	}
+
+	/*
+	 * 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.
+	 */
+	if (override) {
+		acpi_tb_override_table(new_table_desc);
+	}
+
+	acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.tables[i],
+				      new_table_desc->address,
+				      new_table_desc->flags,
+				      new_table_desc->pointer);
+
+	acpi_tb_print_table_header(new_table_desc->address,
+				   new_table_desc->pointer);
+
+	/* This synchronizes acpi_gbl_dsdt_index */
+
+	*table_index = i;
+
+	/* Set the global integer width (based upon revision of the DSDT) */
+
+	if (i == acpi_gbl_dsdt_index) {
+		acpi_ut_set_integer_width(new_table_desc->pointer->revision);
+	}
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_install_standard_table
+ *
+ * PARAMETERS:  address             - Address of the table (might be a virtual
+ *                                    address depending on the table_flags)
+ *              flags               - Flags for the table
+ *              reload              - Whether reload should be performed
+ *              override            - Whether override should be performed
+ *              table_index         - Where the table index is returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: This function is called to verify and install an ACPI table.
+ *              When this function is called by "Load" or "LoadTable" opcodes,
+ *              or by acpi_load_table() API, the "Reload" parameter is set.
+ *              After successfully returning from this function, table is
+ *              "INSTALLED" but not "VALIDATED".
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_install_standard_table(acpi_physical_address address,
+			       u8 flags,
+			       u8 reload, u8 override, u32 *table_index)
+{
+	u32 i;
+	acpi_status status = AE_OK;
+	struct acpi_table_desc new_table_desc;
+
+	ACPI_FUNCTION_TRACE(tb_install_standard_table);
+
+	/* Acquire a temporary table descriptor for validation */
+
+	status = acpi_tb_acquire_temp_table(&new_table_desc, address, flags);
+	if (ACPI_FAILURE(status)) {
+		ACPI_ERROR((AE_INFO,
+			    "Could not acquire table length at %8.8X%8.8X",
+			    ACPI_FORMAT_UINT64(address)));
+		return_ACPI_STATUS(status);
+	}
+
+	/*
+	 * Optionally do not load any SSDTs from the RSDT/XSDT. This can
+	 * be useful for debugging ACPI problems on some machines.
+	 */
+	if (!reload &&
+	    acpi_gbl_disable_ssdt_table_install &&
+	    ACPI_COMPARE_NAMESEG(&new_table_desc.signature, ACPI_SIG_SSDT)) {
+		ACPI_INFO(("Ignoring installation of %4.4s at %8.8X%8.8X",
+			   new_table_desc.signature.ascii,
+			   ACPI_FORMAT_UINT64(address)));
+		goto release_and_exit;
+	}
+
+	/* Acquire the table lock */
+
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+	/* Validate and verify a table before installation */
+
+	status = acpi_tb_verify_temp_table(&new_table_desc, NULL, &i);
+	if (ACPI_FAILURE(status)) {
+		if (status == AE_CTRL_TERMINATE) {
+			/*
+			 * Table was unloaded, allow it to be reloaded.
+			 * As we are going to return AE_OK to the caller, we should
+			 * take the responsibility of freeing the input descriptor.
+			 * Refill the input descriptor to ensure
+			 * acpi_tb_install_table_with_override() can be called again to
+			 * indicate the re-installation.
+			 */
+			acpi_tb_uninstall_table(&new_table_desc);
+			(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+			*table_index = i;
+			return_ACPI_STATUS(AE_OK);
+		}
+		goto unlock_and_exit;
+	}
+
+	/* Add the table to the global root table list */
+
+	acpi_tb_install_table_with_override(&new_table_desc, override,
+					    table_index);
+
+	/* Invoke table handler */
+
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+	acpi_tb_notify_table(ACPI_TABLE_EVENT_INSTALL, new_table_desc.pointer);
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+unlock_and_exit:
+
+	/* Release the table lock */
+
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+
+release_and_exit:
+
+	/* Release the temporary table descriptor */
+
+	acpi_tb_release_temp_table(&new_table_desc);
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_override_table
+ *
+ * PARAMETERS:  old_table_desc      - Validated table descriptor to be
+ *                                    overridden
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Attempt table override by calling the OSL override functions.
+ *              Note: If the table is overridden, then the entire new table
+ *              is acquired and returned by this function.
+ *              Before/after invocation, the table descriptor is in a state
+ *              that is "VALIDATED".
+ *
+ ******************************************************************************/
+
+void acpi_tb_override_table(struct acpi_table_desc *old_table_desc)
+{
+	acpi_status status;
+	struct acpi_table_desc new_table_desc;
+	struct acpi_table_header *table;
+	acpi_physical_address address;
+	u32 length;
+	ACPI_ERROR_ONLY(char *override_type);
+
+	/* (1) Attempt logical override (returns a logical address) */
+
+	status = acpi_os_table_override(old_table_desc->pointer, &table);
+	if (ACPI_SUCCESS(status) && table) {
+		acpi_tb_acquire_temp_table(&new_table_desc,
+					   ACPI_PTR_TO_PHYSADDR(table),
+					   ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL);
+		ACPI_ERROR_ONLY(override_type = "Logical");
+		goto finish_override;
+	}
+
+	/* (2) Attempt physical override (returns a physical address) */
+
+	status = acpi_os_physical_table_override(old_table_desc->pointer,
+						 &address, &length);
+	if (ACPI_SUCCESS(status) && address && length) {
+		acpi_tb_acquire_temp_table(&new_table_desc, address,
+					   ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
+		ACPI_ERROR_ONLY(override_type = "Physical");
+		goto finish_override;
+	}
+
+	return;			/* There was no override */
+
+finish_override:
+
+	/*
+	 * Validate and verify a table before overriding, no nested table
+	 * duplication check as it's too complicated and unnecessary.
+	 */
+	status = acpi_tb_verify_temp_table(&new_table_desc, NULL, NULL);
+	if (ACPI_FAILURE(status)) {
+		return;
+	}
+
+	ACPI_INFO(("%4.4s 0x%8.8X%8.8X"
+		   " %s table override, new table: 0x%8.8X%8.8X",
+		   old_table_desc->signature.ascii,
+		   ACPI_FORMAT_UINT64(old_table_desc->address),
+		   override_type, ACPI_FORMAT_UINT64(new_table_desc.address)));
+
+	/* We can now uninstall the original table */
+
+	acpi_tb_uninstall_table(old_table_desc);
+
+	/*
+	 * Replace the original table descriptor and keep its state as
+	 * "VALIDATED".
+	 */
+	acpi_tb_init_table_descriptor(old_table_desc, new_table_desc.address,
+				      new_table_desc.flags,
+				      new_table_desc.pointer);
+	acpi_tb_validate_temp_table(old_table_desc);
+
+	/* Release the temporary table descriptor */
+
+	acpi_tb_release_temp_table(&new_table_desc);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_uninstall_table
+ *
+ * PARAMETERS:  table_desc          - Table descriptor
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Delete one internal ACPI table
+ *
+ ******************************************************************************/
+
+void acpi_tb_uninstall_table(struct acpi_table_desc *table_desc)
+{
+
+	ACPI_FUNCTION_TRACE(tb_uninstall_table);
+
+	/* Table must be installed */
+
+	if (!table_desc->address) {
+		return_VOID;
+	}
+
+	acpi_tb_invalidate_table(table_desc);
+
+	if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
+	    ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL) {
+		ACPI_FREE(ACPI_PHYSADDR_TO_PTR(table_desc->address));
+	}
+
+	table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL);
+	return_VOID;
+}