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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* 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 ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS 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_table.h
* Author: Rich Draves
* Date: 1989
*
* Definitions for tables, used for IPC capabilities (ipc_entry_t)
* and dead-name requests (ipc_port_request_t).
*/
#ifndef _IPC_IPC_TABLE_H_
#define _IPC_IPC_TABLE_H_
#include <mach/boolean.h>
#include <mach/vm_param.h>
/*
* The is_table_next field of an ipc_space_t points to
* an ipc_table_size structure. These structures must
* be elements of an array, ipc_table_entries.
*
* The array must end with two elements with the same its_size value.
* Except for the terminating element, the its_size values must
* be strictly increasing. The largest (last) its_size value
* must be less than or equal to MACH_PORT_INDEX(MACH_PORT_DEAD).
* This ensures that
* 1) MACH_PORT_INDEX(MACH_PORT_DEAD) isn't a valid index
* in the table, so ipc_entry_get won't allocate it.
* 2) MACH_PORT_MAKE(index+1, 0) and MAKE_PORT_MAKE(size, 0)
* won't ever overflow.
*
*
* The ipr_size field of the first element in a table of
* dead-name requests (ipc_port_request_t) points to the
* ipc_table_size structure. The structures must be elements
* of ipc_table_dnrequests. ipc_table_dnrequests must end
* with an element with zero its_size, and except for this last
* element, the its_size values must be strictly increasing.
*
* The is_table_next field points to the ipc_table_size structure
* for the next larger size of table, not the one currently in use.
* The ipr_size field points to the currently used ipc_table_size.
*/
typedef unsigned int ipc_table_index_t; /* index into tables */
typedef unsigned int ipc_table_elems_t; /* size of tables */
typedef struct ipc_table_size {
ipc_table_elems_t its_size; /* number of elements in table */
} *ipc_table_size_t;
#define ITS_NULL ((ipc_table_size_t) 0)
extern ipc_table_size_t ipc_table_entries;
extern ipc_table_size_t ipc_table_dnrequests;
extern void
ipc_table_init();
/*
* Note that ipc_table_alloc, ipc_table_realloc, and ipc_table_free
* all potentially use the VM system. Hence simple locks can't
* be held across them.
*
* We can't use a copying realloc, because the realloc happens
* with the data unlocked. ipc_table_realloc remaps the data,
* so it is OK.
*/
/* Allocate a table */
extern vm_offset_t ipc_table_alloc(
vm_size_t size);
/* Reallocate a big table */
extern vm_offset_t ipc_table_realloc(
vm_size_t old_size,
vm_offset_t old_table,
vm_size_t new_size);
/* Free a table */
extern void ipc_table_free(
vm_size_t size,
vm_offset_t table);
#define it_entries_alloc(its) \
((ipc_entry_t) \
ipc_table_alloc((its)->its_size * sizeof(struct ipc_entry)))
#define it_entries_reallocable(its) \
(((its)->its_size * sizeof(struct ipc_entry)) >= PAGE_SIZE)
#define it_entries_realloc(its, table, nits) \
((ipc_entry_t) \
ipc_table_realloc((its)->its_size * sizeof(struct ipc_entry), \
(vm_offset_t)(table), \
(nits)->its_size * sizeof(struct ipc_entry)))
#define it_entries_free(its, table) \
ipc_table_free((its)->its_size * sizeof(struct ipc_entry), \
(vm_offset_t)(table))
#define it_dnrequests_alloc(its) \
((ipc_port_request_t) \
ipc_table_alloc((its)->its_size * \
sizeof(struct ipc_port_request)))
#define it_dnrequests_free(its, table) \
ipc_table_free((its)->its_size * \
sizeof(struct ipc_port_request), \
(vm_offset_t)(table))
#endif /* _IPC_IPC_TABLE_H_ */
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