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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.c
* Author: Rich Draves
* Date: 1989
*
* Functions to manipulate tables of IPC capabilities.
*/
#include <mach/kern_return.h>
#include <mach/vm_param.h>
#include <ipc/ipc_table.h>
#include <ipc/ipc_port.h>
#include <ipc/ipc_entry.h>
#include <kern/kalloc.h>
#include <kern/slab.h>
#include <vm/vm_kern.h>
ipc_table_size_t ipc_table_entries;
const unsigned int ipc_table_entries_size = 512;
ipc_table_size_t ipc_table_dnrequests;
const unsigned int ipc_table_dnrequests_size = 64;
void
ipc_table_fill(
ipc_table_size_t its, /* array to fill */
unsigned int num, /* size of array */
unsigned int min, /* at least this many elements */
vm_size_t elemsize) /* size of elements */
{
unsigned int index;
vm_size_t minsize = min * elemsize;
vm_size_t size;
vm_size_t incrsize;
/* first use powers of two, up to the page size */
for (index = 0, size = 1;
(index < num) && (size < PAGE_SIZE);
size <<= 1) {
if (size >= minsize) {
its[index].its_size = size / elemsize;
index++;
}
}
/* then increments of a page, then two pages, etc. */
for (incrsize = PAGE_SIZE; index < num;) {
unsigned int period;
for (period = 0;
(period < 15) && (index < num);
period++, size += incrsize) {
if (size >= minsize) {
its[index].its_size = size / elemsize;
index++;
}
}
if (incrsize < (PAGE_SIZE << 3))
incrsize <<= 1;
}
}
void
ipc_table_init(void)
{
ipc_table_entries = (ipc_table_size_t)
kalloc(sizeof(struct ipc_table_size) *
ipc_table_entries_size);
assert(ipc_table_entries != ITS_NULL);
ipc_table_fill(ipc_table_entries, ipc_table_entries_size - 1,
4, sizeof(struct ipc_entry));
/* the last two elements should have the same size */
ipc_table_entries[ipc_table_entries_size - 1].its_size =
ipc_table_entries[ipc_table_entries_size - 2].its_size;
ipc_table_dnrequests = (ipc_table_size_t)
kalloc(sizeof(struct ipc_table_size) *
ipc_table_dnrequests_size);
assert(ipc_table_dnrequests != ITS_NULL);
ipc_table_fill(ipc_table_dnrequests, ipc_table_dnrequests_size - 1,
2, sizeof(struct ipc_port_request));
/* the last element should have zero size */
ipc_table_dnrequests[ipc_table_dnrequests_size - 1].its_size = 0;
}
/*
* Routine: ipc_table_alloc
* Purpose:
* Allocate a table.
* Conditions:
* May block.
*/
vm_offset_t
ipc_table_alloc(
vm_size_t size)
{
vm_offset_t table;
if (size < PAGE_SIZE)
table = kalloc(size);
else
if (kmem_alloc(kmem_map, &table, size) != KERN_SUCCESS)
table = 0;
return table;
}
/*
* Routine: ipc_table_realloc
* Purpose:
* Reallocate a big table.
*
* The new table remaps the old table,
* so copying is not necessary.
* Conditions:
* Only works for page-size or bigger tables.
* May block.
*/
vm_offset_t
ipc_table_realloc(
vm_size_t old_size,
vm_offset_t old_table,
vm_size_t new_size)
{
vm_offset_t new_table;
if (kmem_realloc(kmem_map, old_table, old_size,
&new_table, new_size) != KERN_SUCCESS)
new_table = 0;
return new_table;
}
/*
* Routine: ipc_table_free
* Purpose:
* Free a table allocated with ipc_table_alloc or
* ipc_table_realloc.
* Conditions:
* May block.
*/
void
ipc_table_free(
vm_size_t size,
vm_offset_t table)
{
if (size < PAGE_SIZE)
kfree(table, size);
else
kmem_free(kmem_map, table, size);
}
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