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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University.
* Copyright (c) 1993,1994 The University of Utah and
* the Computer Systems Laboratory (CSL).
* All rights reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
* THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM ANY LIABILITY
* OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF
* THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: ipc/ipc_entry.h
* Author: Rich Draves
* Date: 1989
*
* Definitions for translation entries, which represent
* tasks' capabilities for ports and port sets.
*/
#ifndef _IPC_IPC_ENTRY_H_
#define _IPC_IPC_ENTRY_H_
#include <mach/mach_types.h>
#include <mach/port.h>
#include <mach/kern_return.h>
#include <kern/slab.h>
#include <ipc/port.h>
#include <ipc/ipc_table.h>
#include <ipc/ipc_types.h>
/*
* Spaces hold capabilities for ipc_object_t's (ports and port sets).
* Each ipc_entry_t records a capability. Most capabilities have
* small names, and the entries are elements of a table.
* Capabilities can have large names, and a splay tree holds
* those entries. The cutoff point between the table and the tree
* is adjusted dynamically to minimize memory consumption.
*
* The ie_index field of entries in the table implements
* a ordered hash table with open addressing and linear probing.
* This hash table converts (space, object) -> name.
* It is used independently of the other fields.
*
* Free (unallocated) entries in the table have null ie_object
* fields. The ie_bits field is zero except for IE_BITS_GEN.
* The ie_next (ie_request) field links free entries into a free list.
*
* The first entry in the table (index 0) is always free.
* It is used as the head of the free list.
*/
typedef unsigned int ipc_entry_bits_t;
typedef ipc_table_elems_t ipc_entry_num_t; /* number of entries */
typedef struct ipc_entry {
ipc_entry_bits_t ie_bits;
struct ipc_object *ie_object;
union {
mach_port_index_t next;
/*XXX ipc_port_request_index_t request;*/
unsigned int request;
} index;
union {
mach_port_index_t table;
struct ipc_tree_entry *tree;
} hash;
} *ipc_entry_t;
#define IE_NULL ((ipc_entry_t) 0)
#define ie_request index.request
#define ie_next index.next
#define ie_index hash.table
#define IE_BITS_UREFS_MASK 0x0000ffff /* 16 bits of user-reference */
#define IE_BITS_UREFS(bits) ((bits) & IE_BITS_UREFS_MASK)
#define IE_BITS_TYPE_MASK 0x001f0000 /* 5 bits of capability type */
#define IE_BITS_TYPE(bits) ((bits) & IE_BITS_TYPE_MASK)
#define IE_BITS_MAREQUEST 0x00200000 /* 1 bit for msg-accepted */
#define IE_BITS_COMPAT 0x00400000 /* 1 bit for compatibility */
#define IE_BITS_COLLISION 0x00800000 /* 1 bit for collisions */
#define IE_BITS_RIGHT_MASK 0x007fffff /* relevant to the right */
#if PORT_GENERATIONS
#define IE_BITS_GEN_MASK 0xff000000U /* 8 bits for generation */
#define IE_BITS_GEN(bits) ((bits) & IE_BITS_GEN_MASK)
#define IE_BITS_GEN_ONE 0x01000000 /* low bit of generation */
#else
#define IE_BITS_GEN_MASK 0
#define IE_BITS_GEN(bits) 0
#define IE_BITS_GEN_ONE 0
#endif
typedef struct ipc_tree_entry {
struct ipc_entry ite_entry;
mach_port_t ite_name;
struct ipc_space *ite_space;
struct ipc_tree_entry *ite_lchild;
struct ipc_tree_entry *ite_rchild;
} *ipc_tree_entry_t;
#define ITE_NULL ((ipc_tree_entry_t) 0)
#define ite_bits ite_entry.ie_bits
#define ite_object ite_entry.ie_object
#define ite_request ite_entry.ie_request
#define ite_next ite_entry.hash.tree
extern struct kmem_cache ipc_tree_entry_cache;
#define ite_alloc() ((ipc_tree_entry_t) kmem_cache_alloc(&ipc_tree_entry_cache))
#define ite_free(ite) kmem_cache_free(&ipc_tree_entry_cache, (vm_offset_t) (ite))
extern ipc_entry_t
ipc_entry_lookup(ipc_space_t space, mach_port_t name);
extern kern_return_t
ipc_entry_get(ipc_space_t space, mach_port_t *namep, ipc_entry_t *entryp);
extern kern_return_t
ipc_entry_alloc(ipc_space_t space, mach_port_t *namep, ipc_entry_t *entryp);
extern kern_return_t
ipc_entry_alloc_name(ipc_space_t space, mach_port_t name, ipc_entry_t *entryp);
extern void
ipc_entry_dealloc(ipc_space_t space, mach_port_t name, ipc_entry_t entry);
extern kern_return_t
ipc_entry_grow_table(ipc_space_t space);
#endif /* _IPC_IPC_ENTRY_H_ */
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