patch-2.4.0-test3 linux/drivers/acpi/dispatcher/dswscope.c

• Lines: 162
• Date: Wed Jul 5 11:23:12 2000
• Orig file: v2.4.0-test2/linux/drivers/acpi/dispatcher/dswscope.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/drivers/acpi/dispatcher/dswscope.c linux/drivers/acpi/dispatcher/dswscope.c
@@ -0,0 +1,161 @@
+
+/******************************************************************************
+ *
+ * Module Name: dswscope - Scope stack manipulation
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000 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 "interp.h"
+#include "dispatch.h"
+
+
+#define _COMPONENT          NAMESPACE
+	 MODULE_NAME         ("dswscope");
+
+
+#define STACK_POP(head) head
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    Acpi_ds_scope_stack_clear
+ *
+ * PARAMETERS:  None
+ *
+ * DESCRIPTION: Pop (and free) everything on the scope stack except the
+ *              root scope object (which remains at the stack top.)
+ *
+ ***************************************************************************/
+
+void
+acpi_ds_scope_stack_clear (
+	ACPI_WALK_STATE         *walk_state)
+{
+	ACPI_GENERIC_STATE      *scope_info;
+
+
+	while (walk_state->scope_info) {
+		/* Pop a scope off the stack */
+
+		scope_info = walk_state->scope_info;
+		walk_state->scope_info = scope_info->scope.next;
+
+		acpi_cm_delete_generic_state (scope_info);
+	}
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    Acpi_ds_scope_stack_push
+ *
+ * PARAMETERS:  *New_scope,             - Name to be made current
+ *              Type,                   - Type of frame being pushed
+ *
+ * DESCRIPTION: Push the current scope on the scope stack, and make the
+ *              passed nte current.
+ *
+ ***************************************************************************/
+
+ACPI_STATUS
+acpi_ds_scope_stack_push (
+	ACPI_NAME_TABLE         *new_scope,
+	OBJECT_TYPE_INTERNAL    type,
+	ACPI_WALK_STATE         *walk_state)
+{
+	ACPI_GENERIC_STATE      *scope_info;
+
+
+	if (!new_scope) {
+		/*  invalid scope   */
+
+		REPORT_ERROR ("Ds_scope_stack_push: null scope passed");
+		return (AE_BAD_PARAMETER);
+	}
+
+	/* Make sure object type is valid */
+
+	if (!acpi_aml_validate_object_type (type)) {
+		REPORT_WARNING ("Ds_scope_stack_push: type code out of range");
+	}
+
+
+	/* Allocate a new scope object */
+
+	scope_info = acpi_cm_create_generic_state ();
+	if (!scope_info) {
+		return (AE_NO_MEMORY);
+	}
+
+	/* Init new scope object */
+
+	scope_info->scope.name_table = new_scope;
+	scope_info->common.value = (u16) type;
+
+	/* Push new scope object onto stack */
+
+	acpi_cm_push_generic_state (&walk_state->scope_info, scope_info);
+
+	return (AE_OK);
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    Acpi_ds_scope_stack_pop
+ *
+ * PARAMETERS:  Type                - The type of frame to be found
+ *
+ * DESCRIPTION: Pop the scope stack until a frame of the requested type
+ *              is found.
+ *
+ * RETURN:      Count of frames popped.  If no frame of the requested type
+ *              was found, the count is returned as a negative number and
+ *              the scope stack is emptied (which sets the current scope
+ *              to the root).  If the scope stack was empty at entry, the
+ *              function is a no-op and returns 0.
+ *
+ ***************************************************************************/
+
+ACPI_STATUS
+acpi_ds_scope_stack_pop (
+	ACPI_WALK_STATE         *walk_state)
+{
+	ACPI_GENERIC_STATE      *scope_info;
+
+
+	/*
+	 * Pop scope info object off the stack.
+	 */
+
+	scope_info = acpi_cm_pop_generic_state (&walk_state->scope_info);
+	if (!scope_info) {
+		return (AE_STACK_UNDERFLOW);
+	}
+
+	acpi_cm_delete_generic_state (scope_info);
+
+	return (AE_OK);
+}
+
+