Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 637 insertions, 0 deletions

diff --git a/drivers/acpi/namespace/nsaccess.c b/drivers/acpi/namespace/nsaccess.c
new file mode 100644
index 000000000000..1c0c12336c57
--- /dev/null
+++ b/drivers/acpi/namespace/nsaccess.c
@@ -0,0 +1,637 @@
+/*******************************************************************************
+ *
+ * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+
+#include <acpi/acpi.h>
+#include <acpi/amlcode.h>
+#include <acpi/acnamesp.h>
+#include <acpi/acdispat.h>
+
+
+#define _COMPONENT          ACPI_NAMESPACE
+         ACPI_MODULE_NAME    ("nsaccess")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_root_initialize
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Allocate and initialize the default root named objects
+ *
+ * MUTEX:       Locks namespace for entire execution
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_root_initialize (void)
+{
+        acpi_status                         status;
+        const struct acpi_predefined_names *init_val = NULL;
+        struct acpi_namespace_node          *new_node;
+        union acpi_operand_object           *obj_desc;
+        acpi_string                         val = NULL;
+
+
+        ACPI_FUNCTION_TRACE ("ns_root_initialize");
+
+
+        status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
+        if (ACPI_FAILURE (status)) {
+                return_ACPI_STATUS (status);
+        }
+
+        /*
+         * The global root ptr is initially NULL, so a non-NULL value indicates
+         * that acpi_ns_root_initialize() has already been called; just return.
+         */
+        if (acpi_gbl_root_node) {
+                status = AE_OK;
+                goto unlock_and_exit;
+        }
+
+        /*
+         * Tell the rest of the subsystem that the root is initialized
+         * (This is OK because the namespace is locked)
+         */
+        acpi_gbl_root_node = &acpi_gbl_root_node_struct;
+
+        /* Enter the pre-defined names in the name table */
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+                "Entering predefined entries into namespace\n"));
+
+        for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
+                /* _OSI is optional for now, will be permanent later */
+
+                if (!ACPI_STRCMP (init_val->name, "_OSI") && !acpi_gbl_create_osi_method) {
+                        continue;
+                }
+
+                status = acpi_ns_lookup (NULL, init_val->name, init_val->type,
+                                  ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH,
+                                  NULL, &new_node);
+
+                if (ACPI_FAILURE (status) || (!new_node)) /* Must be on same line for code converter */ {
+                        ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                                "Could not create predefined name %s, %s\n",
+                                init_val->name, acpi_format_exception (status)));
+                }
+
+                /*
+                 * Name entered successfully.
+                 * If entry in pre_defined_names[] specifies an
+                 * initial value, create the initial value.
+                 */
+                if (init_val->val) {
+                        status = acpi_os_predefined_override (init_val, &val);
+                        if (ACPI_FAILURE (status)) {
+                                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+                                        "Could not override predefined %s\n",
+                                        init_val->name));
+                        }
+
+                        if (!val) {
+                                val = init_val->val;
+                        }
+
+                        /*
+                         * Entry requests an initial value, allocate a
+                         * descriptor for it.
+                         */
+                        obj_desc = acpi_ut_create_internal_object (init_val->type);
+                        if (!obj_desc) {
+                                status = AE_NO_MEMORY;
+                                goto unlock_and_exit;
+                        }
+
+                        /*
+                         * Convert value string from table entry to
+                         * internal representation. Only types actually
+                         * used for initial values are implemented here.
+                         */
+                        switch (init_val->type) {
+                        case ACPI_TYPE_METHOD:
+                                obj_desc->method.param_count = (u8) ACPI_TO_INTEGER (val);
+                                obj_desc->common.flags |= AOPOBJ_DATA_VALID;
+
+#if defined (_ACPI_ASL_COMPILER) || defined (_ACPI_DUMP_App)
+
+                                /*
+                                 * i_aSL Compiler cheats by putting parameter count
+                                 * in the owner_iD
+                                 */
+                                new_node->owner_id = obj_desc->method.param_count;
+#else
+                                /* Mark this as a very SPECIAL method */
+
+                                obj_desc->method.method_flags = AML_METHOD_INTERNAL_ONLY;
+                                obj_desc->method.implementation = acpi_ut_osi_implementation;
+#endif
+                                break;
+
+                        case ACPI_TYPE_INTEGER:
+
+                                obj_desc->integer.value = ACPI_TO_INTEGER (val);
+                                break;
+
+
+                        case ACPI_TYPE_STRING:
+
+                                /*
+                                 * Build an object around the static string
+                                 */
+                                obj_desc->string.length = (u32) ACPI_STRLEN (val);
+                                obj_desc->string.pointer = val;
+                                obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
+                                break;
+
+
+                        case ACPI_TYPE_MUTEX:
+
+                                obj_desc->mutex.node = new_node;
+                                obj_desc->mutex.sync_level = (u8) (ACPI_TO_INTEGER (val) - 1);
+
+                                if (ACPI_STRCMP (init_val->name, "_GL_") == 0) {
+                                        /*
+                                         * Create a counting semaphore for the
+                                         * global lock
+                                         */
+                                        status = acpi_os_create_semaphore (ACPI_NO_UNIT_LIMIT,
+                                                         1, &obj_desc->mutex.semaphore);
+                                        if (ACPI_FAILURE (status)) {
+                                                acpi_ut_remove_reference (obj_desc);
+                                                goto unlock_and_exit;
+                                        }
+
+                                        /*
+                                         * We just created the mutex for the
+                                         * global lock, save it
+                                         */
+                                        acpi_gbl_global_lock_semaphore = obj_desc->mutex.semaphore;
+                                }
+                                else {
+                                        /* Create a mutex */
+
+                                        status = acpi_os_create_semaphore (1, 1,
+                                                           &obj_desc->mutex.semaphore);
+                                        if (ACPI_FAILURE (status)) {
+                                                acpi_ut_remove_reference (obj_desc);
+                                                goto unlock_and_exit;
+                                        }
+                                }
+                                break;
+
+
+                        default:
+
+                                ACPI_REPORT_ERROR (("Unsupported initial type value %X\n",
+                                        init_val->type));
+                                acpi_ut_remove_reference (obj_desc);
+                                obj_desc = NULL;
+                                continue;
+                        }
+
+                        /* Store pointer to value descriptor in the Node */
+
+                        status = acpi_ns_attach_object (new_node, obj_desc,
+                                         ACPI_GET_OBJECT_TYPE (obj_desc));
+
+                        /* Remove local reference to the object */
+
+                        acpi_ut_remove_reference (obj_desc);
+                }
+        }
+
+
+unlock_and_exit:
+        (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+
+        /* Save a handle to "_GPE", it is always present */
+
+        if (ACPI_SUCCESS (status)) {
+                status = acpi_ns_get_node_by_path ("\\_GPE", NULL, ACPI_NS_NO_UPSEARCH,
+                                  &acpi_gbl_fadt_gpe_device);
+        }
+
+        return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_lookup
+ *
+ * PARAMETERS:  prefix_node     - Search scope if name is not fully qualified
+ *              Pathname        - Search pathname, in internal format
+ *                                (as represented in the AML stream)
+ *              Type            - Type associated with name
+ *              interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
+ *              Flags           - Flags describing the search restrictions
+ *              walk_state      - Current state of the walk
+ *              return_node     - Where the Node is placed (if found
+ *                                or created successfully)
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Find or enter the passed name in the name space.
+ *              Log an error if name not found in Exec mode.
+ *
+ * MUTEX:       Assumes namespace is locked.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_lookup (
+        union acpi_generic_state        *scope_info,
+        char                            *pathname,
+        acpi_object_type                type,
+        acpi_interpreter_mode           interpreter_mode,
+        u32                             flags,
+        struct acpi_walk_state          *walk_state,
+        struct acpi_namespace_node      **return_node)
+{
+        acpi_status                     status;
+        char                            *path = pathname;
+        struct acpi_namespace_node      *prefix_node;
+        struct acpi_namespace_node      *current_node = NULL;
+        struct acpi_namespace_node      *this_node = NULL;
+        u32                             num_segments;
+        u32                             num_carats;
+        acpi_name                       simple_name;
+        acpi_object_type                type_to_check_for;
+        acpi_object_type                this_search_type;
+        u32                             search_parent_flag = ACPI_NS_SEARCH_PARENT;
+        u32                             local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND |
+                           ACPI_NS_SEARCH_PARENT);
+
+
+        ACPI_FUNCTION_TRACE ("ns_lookup");
+
+
+        if (!return_node) {
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+        }
+
+        acpi_gbl_ns_lookup_count++;
+        *return_node = ACPI_ENTRY_NOT_FOUND;
+
+        if (!acpi_gbl_root_node) {
+                return_ACPI_STATUS (AE_NO_NAMESPACE);
+        }
+
+        /*
+         * Get the prefix scope.
+         * A null scope means use the root scope
+         */
+        if ((!scope_info) ||
+                (!scope_info->scope.node)) {
+                ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                        "Null scope prefix, using root node (%p)\n",
+                        acpi_gbl_root_node));
+
+                prefix_node = acpi_gbl_root_node;
+        }
+        else {
+                prefix_node = scope_info->scope.node;
+                if (ACPI_GET_DESCRIPTOR_TYPE (prefix_node) != ACPI_DESC_TYPE_NAMED) {
+                        ACPI_REPORT_ERROR (("ns_lookup: %p is not a namespace node [%s]\n",
+                                        prefix_node, acpi_ut_get_descriptor_name (prefix_node)));
+                        return_ACPI_STATUS (AE_AML_INTERNAL);
+                }
+
+                /*
+                 * This node might not be a actual "scope" node (such as a
+                 * Device/Method, etc.)  It could be a Package or other object node.
+                 * Backup up the tree to find the containing scope node.
+                 */
+                while (!acpi_ns_opens_scope (prefix_node->type) &&
+                                prefix_node->type != ACPI_TYPE_ANY) {
+                        prefix_node = acpi_ns_get_parent_node (prefix_node);
+                }
+        }
+
+        /* Save type   TBD: may be no longer necessary */
+
+        type_to_check_for = type;
+
+        /*
+         * Begin examination of the actual pathname
+         */
+        if (!pathname) {
+                /* A Null name_path is allowed and refers to the root */
+
+                num_segments = 0;
+                this_node    = acpi_gbl_root_node;
+                path     = "";
+
+                ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                        "Null Pathname (Zero segments), Flags=%X\n", flags));
+        }
+        else {
+                /*
+                 * Name pointer is valid (and must be in internal name format)
+                 *
+                 * Check for scope prefixes:
+                 *
+                 * As represented in the AML stream, a namepath consists of an
+                 * optional scope prefix followed by a name segment part.
+                 *
+                 * If present, the scope prefix is either a Root Prefix (in
+                 * which case the name is fully qualified), or one or more
+                 * Parent Prefixes (in which case the name's scope is relative
+                 * to the current scope).
+                 */
+                if (*path == (u8) AML_ROOT_PREFIX) {
+                        /* Pathname is fully qualified, start from the root */
+
+                        this_node = acpi_gbl_root_node;
+                        search_parent_flag = ACPI_NS_NO_UPSEARCH;
+
+                        /* Point to name segment part */
+
+                        path++;
+
+                        ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                                "Path is absolute from root [%p]\n", this_node));
+                }
+                else {
+                        /* Pathname is relative to current scope, start there */
+
+                        ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                                "Searching relative to prefix scope [%4.4s] (%p)\n",
+                                acpi_ut_get_node_name (prefix_node), prefix_node));
+
+                        /*
+                         * Handle multiple Parent Prefixes (carat) by just getting
+                         * the parent node for each prefix instance.
+                         */
+                        this_node = prefix_node;
+                        num_carats = 0;
+                        while (*path == (u8) AML_PARENT_PREFIX) {
+                                /* Name is fully qualified, no search rules apply */
+
+                                search_parent_flag = ACPI_NS_NO_UPSEARCH;
+                                /*
+                                 * Point past this prefix to the name segment
+                                 * part or the next Parent Prefix
+                                 */
+                                path++;
+
+                                /* Backup to the parent node */
+
+                                num_carats++;
+                                this_node = acpi_ns_get_parent_node (this_node);
+                                if (!this_node) {
+                                        /* Current scope has no parent scope */
+
+                                        ACPI_REPORT_ERROR (
+                                                ("ACPI path has too many parent prefixes (^) - reached beyond root node\n"));
+                                        return_ACPI_STATUS (AE_NOT_FOUND);
+                                }
+                        }
+
+                        if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
+                                ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                                        "Search scope is [%4.4s], path has %d carat(s)\n",
+                                        acpi_ut_get_node_name (this_node), num_carats));
+                        }
+                }
+
+                /*
+                 * Determine the number of ACPI name segments in this pathname.
+                 *
+                 * The segment part consists of either:
+                 *  - A Null name segment (0)
+                 *  - A dual_name_prefix followed by two 4-byte name segments
+                 *  - A multi_name_prefix followed by a byte indicating the
+                 *      number of segments and the segments themselves.
+                 *  - A single 4-byte name segment
+                 *
+                 * Examine the name prefix opcode, if any, to determine the number of
+                 * segments.
+                 */
+                switch (*path) {
+                case 0:
+                        /*
+                         * Null name after a root or parent prefixes. We already
+                         * have the correct target node and there are no name segments.
+                         */
+                        num_segments = 0;
+                        type = this_node->type;
+
+                        ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                                "Prefix-only Pathname (Zero name segments), Flags=%X\n",
+                                flags));
+                        break;
+
+                case AML_DUAL_NAME_PREFIX:
+
+                        /* More than one name_seg, search rules do not apply */
+
+                        search_parent_flag = ACPI_NS_NO_UPSEARCH;
+
+                        /* Two segments, point to first name segment */
+
+                        num_segments = 2;
+                        path++;
+
+                        ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                                "Dual Pathname (2 segments, Flags=%X)\n", flags));
+                        break;
+
+                case AML_MULTI_NAME_PREFIX_OP:
+
+                        /* More than one name_seg, search rules do not apply */
+
+                        search_parent_flag = ACPI_NS_NO_UPSEARCH;
+
+                        /* Extract segment count, point to first name segment */
+
+                        path++;
+                        num_segments = (u32) (u8) *path;
+                        path++;
+
+                        ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                                "Multi Pathname (%d Segments, Flags=%X) \n",
+                                num_segments, flags));
+                        break;
+
+                default:
+                        /*
+                         * Not a Null name, no Dual or Multi prefix, hence there is
+                         * only one name segment and Pathname is already pointing to it.
+                         */
+                        num_segments = 1;
+
+                        ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                                "Simple Pathname (1 segment, Flags=%X)\n", flags));
+                        break;
+                }
+
+                ACPI_DEBUG_EXEC (acpi_ns_print_pathname (num_segments, path));
+        }
+
+
+        /*
+         * Search namespace for each segment of the name.  Loop through and
+         * verify (or add to the namespace) each name segment.
+         *
+         * The object type is significant only at the last name
+         * segment.  (We don't care about the types along the path, only
+         * the type of the final target object.)
+         */
+        this_search_type = ACPI_TYPE_ANY;
+        current_node = this_node;
+        while (num_segments && current_node) {
+                num_segments--;
+                if (!num_segments) {
+                        /*
+                         * This is the last segment, enable typechecking
+                         */
+                        this_search_type = type;
+
+                        /*
+                         * Only allow automatic parent search (search rules) if the caller
+                         * requested it AND we have a single, non-fully-qualified name_seg
+                         */
+                        if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) &&
+                                (flags & ACPI_NS_SEARCH_PARENT)) {
+                                local_flags |= ACPI_NS_SEARCH_PARENT;
+                        }
+
+                        /* Set error flag according to caller */
+
+                        if (flags & ACPI_NS_ERROR_IF_FOUND) {
+                                local_flags |= ACPI_NS_ERROR_IF_FOUND;
+                        }
+                }
+
+                /* Extract one ACPI name from the front of the pathname */
+
+                ACPI_MOVE_32_TO_32 (&simple_name, path);
+
+                /* Try to find the single (4 character) ACPI name */
+
+                status = acpi_ns_search_and_enter (simple_name, walk_state, current_node,
+                                 interpreter_mode, this_search_type, local_flags, &this_node);
+                if (ACPI_FAILURE (status)) {
+                        if (status == AE_NOT_FOUND) {
+                                /* Name not found in ACPI namespace */
+
+                                ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+                                        "Name [%4.4s] not found in scope [%4.4s] %p\n",
+                                        (char *) &simple_name, (char *) &current_node->name,
+                                        current_node));
+                        }
+
+                        *return_node = this_node;
+                        return_ACPI_STATUS (status);
+                }
+
+                /*
+                 * Sanity typecheck of the target object:
+                 *
+                 * If 1) This is the last segment (num_segments == 0)
+                 *    2) And we are looking for a specific type
+                 *       (Not checking for TYPE_ANY)
+                 *    3) Which is not an alias
+                 *    4) Which is not a local type (TYPE_SCOPE)
+                 *    5) And the type of target object is known (not TYPE_ANY)
+                 *    6) And target object does not match what we are looking for
+                 *
+                 * Then we have a type mismatch.  Just warn and ignore it.
+                 */
+                if ((num_segments       == 0)                               &&
+                        (type_to_check_for  != ACPI_TYPE_ANY)                   &&
+                        (type_to_check_for  != ACPI_TYPE_LOCAL_ALIAS)           &&
+                        (type_to_check_for  != ACPI_TYPE_LOCAL_METHOD_ALIAS)    &&
+                        (type_to_check_for  != ACPI_TYPE_LOCAL_SCOPE)           &&
+                        (this_node->type    != ACPI_TYPE_ANY)                   &&
+                        (this_node->type    != type_to_check_for)) {
+                        /* Complain about a type mismatch */
+
+                        ACPI_REPORT_WARNING (
+                                ("ns_lookup: Type mismatch on %4.4s (%s), searching for (%s)\n",
+                                (char *) &simple_name, acpi_ut_get_type_name (this_node->type),
+                                acpi_ut_get_type_name (type_to_check_for)));
+                }
+
+                /*
+                 * If this is the last name segment and we are not looking for a
+                 * specific type, but the type of found object is known, use that type
+                 * to see if it opens a scope.
+                 */
+                if ((num_segments == 0) && (type == ACPI_TYPE_ANY)) {
+                        type = this_node->type;
+                }
+
+                /* Point to next name segment and make this node current */
+
+                path += ACPI_NAME_SIZE;
+                current_node = this_node;
+        }
+
+        /*
+         * Always check if we need to open a new scope
+         */
+        if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) {
+                /*
+                 * If entry is a type which opens a scope, push the new scope on the
+                 * scope stack.
+                 */
+                if (acpi_ns_opens_scope (type)) {
+                        status = acpi_ds_scope_stack_push (this_node, type, walk_state);
+                        if (ACPI_FAILURE (status)) {
+                                return_ACPI_STATUS (status);
+                        }
+                }
+        }
+
+        *return_node = this_node;
+        return_ACPI_STATUS (AE_OK);
+}
+