/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #ifndef _PEXPERT_DEVICE_TREE_H_ #define _PEXPERT_DEVICE_TREE_H_ #include <sys/appleapiopts.h> #ifdef __APPLE_API_PRIVATE #ifdef __cplusplus extern "C" { #endif /* ------------------------------------------------------------------------------- Foundation Types ------------------------------------------------------------------------------- */ enum { kDTPathNameSeparator = '/' /* 0x2F */ }; /* Property Name Definitions (Property Names are C-Strings)*/ enum { kDTMaxPropertyNameLength=31 /* Max length of Property Name (terminator not included) */ }; typedef char DTPropertyNameBuf[32]; /* Entry Name Definitions (Entry Names are C-Strings)*/ enum { kDTMaxEntryNameLength = 31 /* Max length of a C-String Entry Name (terminator not included) */ }; /* length of DTEntryNameBuf = kDTMaxEntryNameLength +1*/ typedef char DTEntryNameBuf[32]; /* Entry*/ typedef struct OpaqueDTEntry* DTEntry; /* Entry Iterator*/ typedef struct OpaqueDTEntryIterator* DTEntryIterator; /* Property Iterator*/ typedef struct OpaqueDTPropertyIterator* DTPropertyIterator; /* status values*/ enum { kError = -1, kIterationDone = 0, kSuccess = 1 }; /* Structures for a Flattened Device Tree */ #define kPropNameLength 32 typedef struct DeviceTreeNodeProperty { char name[kPropNameLength]; // NUL terminated property name uint32_t length; // Length (bytes) of folloing prop value // unsigned long value[1]; // Variable length value of property // Padded to a multiple of a longword? } DeviceTreeNodeProperty; typedef struct OpaqueDTEntry { uint32_t nProperties; // Number of props[] elements (0 => end) uint32_t nChildren; // Number of children[] elements // DeviceTreeNodeProperty props[];// array size == nProperties // DeviceTreeNode children[]; // array size == nChildren } DeviceTreeNode; #ifndef __MWERKS__ /* ------------------------------------------------------------------------------- Device Tree Calls ------------------------------------------------------------------------------- */ /* Used to initalize the device tree functions. */ /* base is the base address of the flatened device tree */ void DTInit(void *base); /* ------------------------------------------------------------------------------- Entry Handling ------------------------------------------------------------------------------- */ /* Compare two Entry's for equality. */ extern int DTEntryIsEqual(const DTEntry ref1, const DTEntry ref2); /* ------------------------------------------------------------------------------- LookUp Entry by Name ------------------------------------------------------------------------------- */ /* DTFindEntry: Find the device tree entry that contains propName=propValue. It currently searches the entire tree. This function should eventually go in DeviceTree.c. Returns: kSuccess = entry was found. Entry is in entryH. kError = entry was not found */ extern int DTFindEntry(const char *propName, const char *propValue, DTEntry *entryH); /* Lookup Entry Locates an entry given a specified subroot (searchPoint) and path name. If the searchPoint pointer is NULL, the path name is assumed to be an absolute path name rooted to the root of the device tree. */ extern int DTLookupEntry(const DTEntry searchPoint, const char *pathName, DTEntry *foundEntry); /* ------------------------------------------------------------------------------- Entry Iteration ------------------------------------------------------------------------------- */ /* An Entry Iterator maintains three variables that are of interest to clients. First is an "OutermostScope" which defines the outer boundry of the iteration. This is defined by the starting entry and includes that entry plus all of it's embedded entries. Second is a "currentScope" which is the entry the iterator is currently in. And third is a "currentPosition" which is the last entry returned during an iteration. Create Entry Iterator Create the iterator structure. The outermostScope and currentScope of the iterator are set to "startEntry". If "startEntry" = NULL, the outermostScope and currentScope are set to the root entry. The currentPosition for the iterator is set to "nil". */ extern int DTCreateEntryIterator(const DTEntry startEntry, DTEntryIterator *iterator); /* Dispose Entry Iterator*/ extern int DTDisposeEntryIterator(DTEntryIterator iterator); /* Enter Child Entry Move an Entry Iterator into the scope of a specified child entry. The currentScope of the iterator is set to the entry specified in "childEntry". If "childEntry" is nil, the currentScope is set to the entry specified by the currentPosition of the iterator. */ extern int DTEnterEntry(DTEntryIterator iterator, DTEntry childEntry); /* Exit to Parent Entry Move an Entry Iterator out of the current entry back into the scope of it's parent entry. The currentPosition of the iterator is reset to the current entry (the previous currentScope), so the next iteration call will continue where it left off. This position is returned in parameter "currentPosition". */ extern int DTExitEntry(DTEntryIterator iterator, DTEntry *currentPosition); /* Iterate Entries Iterate and return entries contained within the entry defined by the current scope of the iterator. Entries are returned one at a time. When int == kIterationDone, all entries have been exhausted, and the value of nextEntry will be Nil. */ extern int DTIterateEntries(DTEntryIterator iterator, DTEntry *nextEntry); /* Restart Entry Iteration Restart an iteration within the current scope. The iterator is reset such that iteration of the contents of the currentScope entry can be restarted. The outermostScope and currentScope of the iterator are unchanged. The currentPosition for the iterator is set to "nil". */ extern int DTRestartEntryIteration(DTEntryIterator iterator); /* ------------------------------------------------------------------------------- Get Property Values ------------------------------------------------------------------------------- */ /* Get the value of the specified property for the specified entry. Get Property */ extern int DTGetProperty(const DTEntry entry, const char *propertyName, void **propertyValue, unsigned int *propertySize); /* ------------------------------------------------------------------------------- Iterating Properties ------------------------------------------------------------------------------- */ /* Create Property Iterator Create the property iterator structure. The target entry is defined by entry. */ extern int DTCreatePropertyIterator(const DTEntry entry, DTPropertyIterator *iterator); /* Dispose Property Iterator*/ extern int DTDisposePropertyIterator(DTPropertyIterator iterator); /* Iterate Properites Iterate and return properties for given entry. When int == kIterationDone, all properties have been exhausted. */ extern int DTIterateProperties(DTPropertyIterator iterator, char **foundProperty); /* Restart Property Iteration Used to re-iterate over a list of properties. The Property Iterator is reset to the beginning of the list of properties for an entry. */ extern int DTRestartPropertyIteration(DTPropertyIterator iterator); #ifdef __cplusplus } #endif #endif /* __MWERKS__ */ #endif /* __APPLE_API_PRIVATE */ #endif /* _PEXPERT_DEVICE_TREE_H_ */