patch-2.4.6 linux/drivers/acpi/executer/exconfig.c

• Lines: 305
• Date: Wed Jun 20 17:47:40 2001
• Orig file: v2.4.5/linux/drivers/acpi/executer/exconfig.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/acpi/executer/exconfig.c linux/drivers/acpi/executer/exconfig.c
@@ -0,0 +1,304 @@
+/******************************************************************************
+ *
+ * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
+ *              $Revision: 34 $
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000, 2001 R. Byron Moore
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+#include "acpi.h"
+#include "acparser.h"
+#include "acinterp.h"
+#include "amlcode.h"
+#include "acnamesp.h"
+#include "acevents.h"
+#include "actables.h"
+#include "acdispat.h"
+
+
+#define _COMPONENT          ACPI_EXECUTER
+	 MODULE_NAME         ("exconfig")
+
+
+/*****************************************************************************
+ *
+ * FUNCTION:    Acpi_ex_load_table_op
+ *
+ * PARAMETERS:  Rgn_desc        - Op region where the table will be obtained
+ *              Ddb_handle      - Where a handle to the table will be returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Load an ACPI table
+ *
+ ****************************************************************************/
+
+static ACPI_STATUS
+acpi_ex_load_table_op (
+	ACPI_OPERAND_OBJECT     *rgn_desc,
+	ACPI_HANDLE             *ddb_handle)
+{
+	ACPI_STATUS             status;
+	ACPI_OPERAND_OBJECT     *table_desc = NULL;
+	u8                      *table_ptr;
+	u8                      *table_data_ptr;
+	ACPI_TABLE_HEADER       table_header;
+	ACPI_TABLE_DESC         table_info;
+	u32                     i;
+
+
+	/* TBD: [Unhandled] Object can be either a field or an opregion */
+
+
+	/* Get the table header */
+
+	table_header.length = 0;
+	for (i = 0; i < sizeof (ACPI_TABLE_HEADER); i++) {
+		status = acpi_ev_address_space_dispatch (rgn_desc, ACPI_READ_ADR_SPACE,
+				   (ACPI_PHYSICAL_ADDRESS) i, 8,
+				   (u32 *) ((u8 *) &table_header + i));
+		if (ACPI_FAILURE (status)) {
+			return (status);
+		}
+	}
+
+	/* Allocate a buffer for the entire table */
+
+	table_ptr = acpi_ut_allocate (table_header.length);
+	if (!table_ptr) {
+		return (AE_NO_MEMORY);
+	}
+
+	/* Copy the header to the buffer */
+
+	MEMCPY (table_ptr, &table_header, sizeof (ACPI_TABLE_HEADER));
+	table_data_ptr = table_ptr + sizeof (ACPI_TABLE_HEADER);
+
+
+	/* Get the table from the op region */
+
+	for (i = 0; i < table_header.length; i++) {
+		status = acpi_ev_address_space_dispatch (rgn_desc, ACPI_READ_ADR_SPACE,
+				   (ACPI_PHYSICAL_ADDRESS) i, 8,
+				   (u32 *) (table_data_ptr + i));
+		if (ACPI_FAILURE (status)) {
+			goto cleanup;
+		}
+	}
+
+
+	/* Table must be either an SSDT or a PSDT */
+
+	if ((!STRNCMP (table_header.signature,
+			  acpi_gbl_acpi_table_data[ACPI_TABLE_PSDT].signature,
+			  acpi_gbl_acpi_table_data[ACPI_TABLE_PSDT].sig_length)) &&
+		(!STRNCMP (table_header.signature,
+				 acpi_gbl_acpi_table_data[ACPI_TABLE_SSDT].signature,
+				 acpi_gbl_acpi_table_data[ACPI_TABLE_SSDT].sig_length))) {
+		status = AE_BAD_SIGNATURE;
+		goto cleanup;
+	}
+
+	/* Create an object to be the table handle */
+
+	table_desc = acpi_ut_create_internal_object (INTERNAL_TYPE_REFERENCE);
+	if (!table_desc) {
+		status = AE_NO_MEMORY;
+		goto cleanup;
+	}
+
+
+	/* Install the new table into the local data structures */
+
+	table_info.pointer     = (ACPI_TABLE_HEADER *) table_ptr;
+	table_info.length      = table_header.length;
+	table_info.allocation  = ACPI_MEM_ALLOCATED;
+	table_info.base_pointer = table_ptr;
+
+	status = acpi_tb_install_table (NULL, &table_info);
+	if (ACPI_FAILURE (status)) {
+		goto cleanup;
+	}
+
+	/* Add the table to the namespace */
+
+	/* TBD: [Restructure] - change to whatever new interface is appropriate */
+/*
+	Status = Acpi_load_namespace ();
+	if (ACPI_FAILURE (Status))
+	{
+*/
+		/* TBD: [Errors] Unload the table on failure ? */
+/*
+		goto Cleanup;
+	}
+*/
+
+
+	/* TBD: [Investigate] we need a pointer to the table desc */
+
+	/* Init the table handle */
+
+	table_desc->reference.opcode = AML_LOAD_OP;
+	table_desc->reference.object = table_info.installed_desc;
+
+	*ddb_handle = table_desc;
+
+	return (status);
+
+
+cleanup:
+
+	acpi_ut_free (table_desc);
+	acpi_ut_free (table_ptr);
+	return (status);
+
+}
+
+
+/*****************************************************************************
+ *
+ * FUNCTION:    Acpi_ex_unload_table
+ *
+ * PARAMETERS:  Ddb_handle          - Handle to a previously loaded table
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Unload an ACPI table
+ *
+ ****************************************************************************/
+
+static ACPI_STATUS
+acpi_ex_unload_table (
+	ACPI_HANDLE             ddb_handle)
+{
+	ACPI_STATUS             status = AE_NOT_IMPLEMENTED;
+	ACPI_OPERAND_OBJECT     *table_desc = (ACPI_OPERAND_OBJECT *) ddb_handle;
+	ACPI_TABLE_DESC         *table_info;
+
+
+	/* Validate the handle */
+	/* Although the handle is partially validated in Acpi_ex_reconfiguration(),
+	 *  when it calls Acpi_ex_resolve_operands(), the handle is more completely
+	 *  validated here.
+	 */
+
+	if ((!ddb_handle) ||
+		(!VALID_DESCRIPTOR_TYPE (ddb_handle, ACPI_DESC_TYPE_INTERNAL)) ||
+		(((ACPI_OPERAND_OBJECT  *)ddb_handle)->common.type !=
+				INTERNAL_TYPE_REFERENCE)) {
+		return (AE_BAD_PARAMETER);
+	}
+
+
+	/* Get the actual table descriptor from the Ddb_handle */
+
+	table_info = (ACPI_TABLE_DESC *) table_desc->reference.object;
+
+	/*
+	 * Delete the entire namespace under this table Node
+	 * (Offset contains the Table_id)
+	 */
+
+	status = acpi_ns_delete_namespace_by_owner (table_info->table_id);
+	if (ACPI_FAILURE (status)) {
+		return (status);
+	}
+
+	/* Delete the table itself */
+
+	acpi_tb_uninstall_table (table_info->installed_desc);
+
+	/* Delete the table descriptor (Ddb_handle) */
+
+	acpi_ut_remove_reference (table_desc);
+
+	return (status);
+}
+
+
+/*****************************************************************************
+ *
+ * FUNCTION:    Acpi_ex_reconfiguration
+ *
+ * PARAMETERS:  Opcode              - The opcode to be executed
+ *              Walk_state          - Current state of the parse tree walk
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Reconfiguration opcodes such as LOAD and UNLOAD
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+acpi_ex_reconfiguration (
+	u16                     opcode,
+	ACPI_WALK_STATE         *walk_state)
+{
+	ACPI_STATUS             status;
+	ACPI_OPERAND_OBJECT     *region_desc = NULL;
+	ACPI_HANDLE             *ddb_handle;
+
+
+	/* Resolve the operands */
+
+	status = acpi_ex_resolve_operands (opcode, WALK_OPERANDS, walk_state);
+	/* Get the table handle, common for both opcodes */
+
+	status |= acpi_ds_obj_stack_pop_object ((ACPI_OPERAND_OBJECT **) &ddb_handle,
+			 walk_state);
+
+	switch (opcode) {
+
+	case AML_LOAD_OP:
+
+		/* Get the region or field descriptor */
+
+		status |= acpi_ds_obj_stack_pop_object (&region_desc, walk_state);
+		if (ACPI_FAILURE (status)) {
+			acpi_ut_remove_reference (region_desc);
+			return (status);
+		}
+
+		status = acpi_ex_load_table_op (region_desc, ddb_handle);
+		break;
+
+
+	case AML_UNLOAD_OP:
+
+		if (ACPI_FAILURE (status)) {
+			return (status);
+		}
+
+		status = acpi_ex_unload_table (ddb_handle);
+		break;
+
+
+	default:
+
+		status = AE_AML_BAD_OPCODE;
+		break;
+	}
+
+
+	return (status);
+}
+