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/*
* Copyright (c) 1997-1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/*
* Simple UNIX-style resource map routines
*/
#include <oskit/amm.h>
#include <errno.h>
#include "rmap.h"
static amm_entry_t *rmap_alloc_entry(amm_t *amm, oskit_addr_t addr,
oskit_size_t size, int flags);
static void rmap_free_entry(amm_t *amm, amm_entry_t *entry);
/*
* XXX need
* amm_submap(amm_t *amm, oskit_addr_t start, oskit_size_t size)
* for common sub-maps. Would mark the rest of the map unavailable.
*/
void rminit(struct rmap *map, long size, long addr, char *name, int nent)
{
oskit_addr_t saddr = (oskit_addr_t)addr;
oskit_addr_t eaddr = saddr + size;
strncpy(map->name, name, 32);
map->elts = 0;
map->maxelts = nent;
amm_init_gen(&map->amm, RMAP_FREE, 0,
rmap_alloc_entry, rmap_free_entry, 0, 0);
if (AMM_MINADDR < saddr)
(void)amm_modify(&map->amm, AMM_MINADDR, saddr - AMM_MINADDR,
RMAP_UNAVAIL, 0);
if (eaddr < AMM_MAXADDR)
(void)amm_modify(&map->amm, eaddr, AMM_MAXADDR - eaddr,
RMAP_UNAVAIL, 0);
}
/*
* XXX need:
* amm_alloc(amm_t *amm, oskit_addr_t addr, oskit_size_t size, int anywhere)
* style interface for the common case of allocating free resources.
*/
long rmalloc(struct rmap *map, long size)
{
amm_entry_t *entry;
oskit_addr_t addr;
int rc;
if (size <= 0)
panic("rmalloc: bad size");
addr = AMM_MINADDR;
entry = amm_find_gen(&map->amm, &addr, (oskit_size_t)size, RMAP_FREE,
-1, 0, 0, 0);
if (entry == 0)
return 0;
rc = amm_modify(&map->amm, addr, (oskit_size_t)size, RMAP_INUSE, 0);
if (rc == ENOMEM) {
rc = amm_modify(&map->amm, amm_entry_start(entry),
amm_entry_size(entry), RMAP_INUSE, 0);
if (rc)
panic("rmalloc: corrupt map");
printf("WARNING: %s: resources lost\n", map->name);
} else if (rc)
panic("rmalloc: corrupt map");
return (long)amm_entry_start(entry);
}
/*
* XXX need:
* amm_dealloc(amm_t *amm, oskit_addr_t addr, oskit_size_t size)
* style interface for the common case of deallocating resources.
*/
void rmfree(struct rmap *map, long size, long uaddr)
{
amm_entry_t *entry;
oskit_addr_t addr;
int rc;
if (size <= 0)
panic("rmfree: bad size");
addr = (oskit_addr_t)uaddr;
entry = amm_find_gen(&map->amm, &addr, (oskit_size_t)size, RMAP_INUSE,
-1, 0, 0, 0);
if (entry == 0)
panic("rmfree: corrupt map");
rc = amm_modify(&map->amm, addr, (oskit_size_t)size, RMAP_FREE, 0);
if (rc == ENOMEM)
printf("WARNING: %s: resources lost\n", map->name);
else if (rc)
panic("rmfree: corrupt map");
}
void rmdump(struct rmap *map)
{
printf("MAP `%s' (0x%x):\n", map->name, map);
amm_dump(&map->amm);
}
static amm_entry_t *
rmap_alloc_entry(amm_t *amm, oskit_addr_t addr, oskit_size_t size, int flags)
{
struct rmap *map = (struct rmap *)amm;
if (flags != RMAP_UNAVAIL) {
if (map->elts == map->maxelts)
return 0;
map->elts++;
}
return (amm_entry_t *)malloc(sizeof(amm_entry_t));
}
static void
rmap_free_entry(amm_t *amm, amm_entry_t *entry)
{
struct rmap *map = (struct rmap *)amm;
if (amm_entry_flags(entry) != RMAP_UNAVAIL)
map->elts--;
free((void *)entry);
}
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