1 files changed, 530 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c
new file mode 100644
index 000000000..7490429dd
--- /dev/null
+++ b/drivers/acpi/acpica/tbxface.c
@@ -0,0 +1,530 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: tbxface - ACPI table-oriented external interfaces
+ *
+ * Copyright (C) 2000 - 2020, Intel Corp.
+ *
+ *****************************************************************************/
+
+#define EXPORT_ACPI_INTERFACES
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "actables.h"
+
+#define _COMPONENT          ACPI_TABLES
+ACPI_MODULE_NAME("tbxface")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_allocate_root_table
+ *
+ * PARAMETERS:  initial_table_count - Size of initial_table_array, in number of
+ *                                    struct acpi_table_desc structures
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Allocate a root table array. Used by iASL compiler and
+ *              acpi_initialize_tables.
+ *
+ ******************************************************************************/
+acpi_status acpi_allocate_root_table(u32 initial_table_count)
+{
+
+	acpi_gbl_root_table_list.max_table_count = initial_table_count;
+	acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
+
+	return (acpi_tb_resize_root_table_list());
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_initialize_tables
+ *
+ * PARAMETERS:  initial_table_array - Pointer to an array of pre-allocated
+ *                                    struct acpi_table_desc structures. If NULL, the
+ *                                    array is dynamically allocated.
+ *              initial_table_count - Size of initial_table_array, in number of
+ *                                    struct acpi_table_desc structures
+ *              allow_resize        - Flag to tell Table Manager if resize of
+ *                                    pre-allocated array is allowed. Ignored
+ *                                    if initial_table_array is NULL.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
+ *
+ * NOTE:        Allows static allocation of the initial table array in order
+ *              to avoid the use of dynamic memory in confined environments
+ *              such as the kernel boot sequence where it may not be available.
+ *
+ *              If the host OS memory managers are initialized, use NULL for
+ *              initial_table_array, and the table will be dynamically allocated.
+ *
+ ******************************************************************************/
+
+acpi_status ACPI_INIT_FUNCTION
+acpi_initialize_tables(struct acpi_table_desc *initial_table_array,
+		       u32 initial_table_count, u8 allow_resize)
+{
+	acpi_physical_address rsdp_address;
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(acpi_initialize_tables);
+
+	/*
+	 * Setup the Root Table Array and allocate the table array
+	 * if requested
+	 */
+	if (!initial_table_array) {
+		status = acpi_allocate_root_table(initial_table_count);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+	} else {
+		/* Root Table Array has been statically allocated by the host */
+
+		memset(initial_table_array, 0,
+		       (acpi_size)initial_table_count *
+		       sizeof(struct acpi_table_desc));
+
+		acpi_gbl_root_table_list.tables = initial_table_array;
+		acpi_gbl_root_table_list.max_table_count = initial_table_count;
+		acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
+		if (allow_resize) {
+			acpi_gbl_root_table_list.flags |=
+			    ACPI_ROOT_ALLOW_RESIZE;
+		}
+	}
+
+	/* Get the address of the RSDP */
+
+	rsdp_address = acpi_os_get_root_pointer();
+	if (!rsdp_address) {
+		return_ACPI_STATUS(AE_NOT_FOUND);
+	}
+
+	/*
+	 * Get the root table (RSDT or XSDT) and extract all entries to the local
+	 * Root Table Array. This array contains the information of the RSDT/XSDT
+	 * in a common, more usable format.
+	 */
+	status = acpi_tb_parse_root_table(rsdp_address);
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL_INIT(acpi_initialize_tables)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_reallocate_root_table
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
+ *              root list from the previously provided scratch area. Should
+ *              be called once dynamic memory allocation is available in the
+ *              kernel.
+ *
+ ******************************************************************************/
+acpi_status ACPI_INIT_FUNCTION acpi_reallocate_root_table(void)
+{
+	acpi_status status;
+	struct acpi_table_desc *table_desc;
+	u32 i, j;
+
+	ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
+
+	/*
+	 * If there are tables unverified, it is required to reallocate the
+	 * root table list to clean up invalid table entries. Otherwise only
+	 * reallocate the root table list if the host provided a static buffer
+	 * for the table array in the call to acpi_initialize_tables().
+	 */
+	if ((acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) &&
+	    acpi_gbl_enable_table_validation) {
+		return_ACPI_STATUS(AE_SUPPORT);
+	}
+
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+	/*
+	 * Ensure OS early boot logic, which is required by some hosts. If the
+	 * table state is reported to be wrong, developers should fix the
+	 * issue by invoking acpi_put_table() for the reported table during the
+	 * early stage.
+	 */
+	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
+		table_desc = &acpi_gbl_root_table_list.tables[i];
+		if (table_desc->pointer) {
+			ACPI_ERROR((AE_INFO,
+				    "Table [%4.4s] is not invalidated during early boot stage",
+				    table_desc->signature.ascii));
+		}
+	}
+
+	if (!acpi_gbl_enable_table_validation) {
+		/*
+		 * Now it's safe to do full table validation. We can do deferred
+		 * table initialization here once the flag is set.
+		 */
+		acpi_gbl_enable_table_validation = TRUE;
+		for (i = 0; i < acpi_gbl_root_table_list.current_table_count;
+		     ++i) {
+			table_desc = &acpi_gbl_root_table_list.tables[i];
+			if (!(table_desc->flags & ACPI_TABLE_IS_VERIFIED)) {
+				status =
+				    acpi_tb_verify_temp_table(table_desc, NULL,
+							      &j);
+				if (ACPI_FAILURE(status)) {
+					acpi_tb_uninstall_table(table_desc);
+				}
+			}
+		}
+	}
+
+	acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE;
+	status = acpi_tb_resize_root_table_list();
+	acpi_gbl_root_table_list.flags |= ACPI_ROOT_ORIGIN_ALLOCATED;
+
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL_INIT(acpi_reallocate_root_table)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_table_header
+ *
+ * PARAMETERS:  signature           - ACPI signature of needed table
+ *              instance            - Which instance (for SSDTs)
+ *              out_table_header    - The pointer to the where the table header
+ *                                    is returned
+ *
+ * RETURN:      Status and a copy of the table header
+ *
+ * DESCRIPTION: Finds and returns an ACPI table header. Caller provides the
+ *              memory where a copy of the header is to be returned
+ *              (fixed length).
+ *
+ ******************************************************************************/
+acpi_status
+acpi_get_table_header(char *signature,
+		      u32 instance, struct acpi_table_header *out_table_header)
+{
+	u32 i;
+	u32 j;
+	struct acpi_table_header *header;
+
+	/* Parameter validation */
+
+	if (!signature || !out_table_header) {
+		return (AE_BAD_PARAMETER);
+	}
+
+	/* Walk the root table list */
+
+	for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
+	     i++) {
+		if (!ACPI_COMPARE_NAMESEG
+		    (&(acpi_gbl_root_table_list.tables[i].signature),
+		     signature)) {
+			continue;
+		}
+
+		if (++j < instance) {
+			continue;
+		}
+
+		if (!acpi_gbl_root_table_list.tables[i].pointer) {
+			if ((acpi_gbl_root_table_list.tables[i].flags &
+			     ACPI_TABLE_ORIGIN_MASK) ==
+			    ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL) {
+				header =
+				    acpi_os_map_memory(acpi_gbl_root_table_list.
+						       tables[i].address,
+						       sizeof(struct
+							      acpi_table_header));
+				if (!header) {
+					return (AE_NO_MEMORY);
+				}
+
+				memcpy(out_table_header, header,
+				       sizeof(struct acpi_table_header));
+				acpi_os_unmap_memory(header,
+						     sizeof(struct
+							    acpi_table_header));
+			} else {
+				return (AE_NOT_FOUND);
+			}
+		} else {
+			memcpy(out_table_header,
+			       acpi_gbl_root_table_list.tables[i].pointer,
+			       sizeof(struct acpi_table_header));
+		}
+		return (AE_OK);
+	}
+
+	return (AE_NOT_FOUND);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_table_header)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_table
+ *
+ * PARAMETERS:  signature           - ACPI signature of needed table
+ *              instance            - Which instance (for SSDTs)
+ *              out_table           - Where the pointer to the table is returned
+ *
+ * RETURN:      Status and pointer to the requested table
+ *
+ * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the
+ *              RSDT/XSDT.
+ *              Note that an early stage acpi_get_table() call must be paired
+ *              with an early stage acpi_put_table() call. otherwise the table
+ *              pointer mapped by the early stage mapping implementation may be
+ *              erroneously unmapped by the late stage unmapping implementation
+ *              in an acpi_put_table() invoked during the late stage.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_get_table(char *signature,
+	       u32 instance, struct acpi_table_header ** out_table)
+{
+	u32 i;
+	u32 j;
+	acpi_status status = AE_NOT_FOUND;
+	struct acpi_table_desc *table_desc;
+
+	/* Parameter validation */
+
+	if (!signature || !out_table) {
+		return (AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Note that the following line is required by some OSPMs, they only
+	 * check if the returned table is NULL instead of the returned status
+	 * to determined if this function is succeeded.
+	 */
+	*out_table = NULL;
+
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+	/* Walk the root table list */
+
+	for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
+	     i++) {
+		table_desc = &acpi_gbl_root_table_list.tables[i];
+
+		if (!ACPI_COMPARE_NAMESEG(&table_desc->signature, signature)) {
+			continue;
+		}
+
+		if (++j < instance) {
+			continue;
+		}
+
+		status = acpi_tb_get_table(table_desc, out_table);
+		break;
+	}
+
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+	return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_table)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_put_table
+ *
+ * PARAMETERS:  table               - The pointer to the table
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Release a table returned by acpi_get_table() and its clones.
+ *              Note that it is not safe if this function was invoked after an
+ *              uninstallation happened to the original table descriptor.
+ *              Currently there is no OSPMs' requirement to handle such
+ *              situations.
+ *
+ ******************************************************************************/
+void acpi_put_table(struct acpi_table_header *table)
+{
+	u32 i;
+	struct acpi_table_desc *table_desc;
+
+	ACPI_FUNCTION_TRACE(acpi_put_table);
+
+	if (!table) {
+		return_VOID;
+	}
+
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+	/* Walk the root table list */
+
+	for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
+		table_desc = &acpi_gbl_root_table_list.tables[i];
+
+		if (table_desc->pointer != table) {
+			continue;
+		}
+
+		acpi_tb_put_table(table_desc);
+		break;
+	}
+
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+	return_VOID;
+}
+
+ACPI_EXPORT_SYMBOL(acpi_put_table)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_table_by_index
+ *
+ * PARAMETERS:  table_index         - Table index
+ *              out_table           - Where the pointer to the table is returned
+ *
+ * RETURN:      Status and pointer to the requested table
+ *
+ * DESCRIPTION: Obtain a table by an index into the global table list. Used
+ *              internally also.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_get_table_by_index(u32 table_index, struct acpi_table_header **out_table)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
+
+	/* Parameter validation */
+
+	if (!out_table) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Note that the following line is required by some OSPMs, they only
+	 * check if the returned table is NULL instead of the returned status
+	 * to determined if this function is succeeded.
+	 */
+	*out_table = NULL;
+
+	(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
+
+	/* Validate index */
+
+	if (table_index >= acpi_gbl_root_table_list.current_table_count) {
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+	status =
+	    acpi_tb_get_table(&acpi_gbl_root_table_list.tables[table_index],
+			      out_table);
+
+unlock_and_exit:
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_install_table_handler
+ *
+ * PARAMETERS:  handler         - Table event handler
+ *              context         - Value passed to the handler on each event
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a global table event handler.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_install_table_handler(acpi_table_handler handler, void *context)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(acpi_install_table_handler);
+
+	if (!handler) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Don't allow more than one handler */
+
+	if (acpi_gbl_table_handler) {
+		status = AE_ALREADY_EXISTS;
+		goto cleanup;
+	}
+
+	/* Install the handler */
+
+	acpi_gbl_table_handler = handler;
+	acpi_gbl_table_handler_context = context;
+
+cleanup:
+	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_remove_table_handler
+ *
+ * PARAMETERS:  handler         - Table event handler that was installed
+ *                                previously.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Remove a table event handler
+ *
+ ******************************************************************************/
+acpi_status acpi_remove_table_handler(acpi_table_handler handler)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
+
+	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Make sure that the installed handler is the same */
+
+	if (!handler || handler != acpi_gbl_table_handler) {
+		status = AE_BAD_PARAMETER;
+		goto cleanup;
+	}
+
+	/* Remove the handler */
+
+	acpi_gbl_table_handler = NULL;
+
+cleanup:
+	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)