mirror of https://github.com/dzavalishin/oskit/
66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
|
/*
|
||
|
|
* Copyright (c) 1995, 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "lmm.h"
|
||
|
|
|
||
|
|
void lmm_add_free(lmm_t *lmm, void *block, oskit_size_t size)
|
||
|
|
{
|
||
|
|
struct lmm_region *reg;
|
||
|
|
oskit_addr_t min = (oskit_addr_t)block;
|
||
|
|
oskit_addr_t max = min + size;
|
||
|
|
|
||
|
|
/* Restrict the min and max further to be properly aligned.
|
||
|
|
Note that this is the opposite of what lmm_free() does,
|
||
|
|
because lmm_free() assumes the block was allocated with lmm_alloc()
|
||
|
|
and thus would be a subset of a larger, already-aligned free block.
|
||
|
|
Here we can assume no such thing. */
|
||
|
|
min = (min + ALIGN_MASK) & ~ALIGN_MASK;
|
||
|
|
max &= ~ALIGN_MASK;
|
||
|
|
assert(max >= min);
|
||
|
|
|
||
|
|
/* If after alignment we have nothing left, we're done. */
|
||
|
|
if (max == min)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/* Add the block to the free list(s) of whatever region(s) it overlaps.
|
||
|
|
If some or all of the block doesn't fall into any existing region,
|
||
|
|
then that memory is simply dropped on the floor. */
|
||
|
|
for (reg = lmm->regions; reg; reg = reg->next)
|
||
|
|
{
|
||
|
|
assert(reg->min < reg->max);
|
||
|
|
assert((reg->min & ALIGN_MASK) == 0);
|
||
|
|
assert((reg->max & ALIGN_MASK) == 0);
|
||
|
|
|
||
|
|
if ((max > reg->min) && (min < reg->max))
|
||
|
|
{
|
||
|
|
oskit_addr_t new_min = min, new_max = max;
|
||
|
|
|
||
|
|
/* Only add the part of the block
|
||
|
|
that actually falls within this region. */
|
||
|
|
if (new_min < reg->min)
|
||
|
|
new_min = reg->min;
|
||
|
|
if (new_max > reg->max)
|
||
|
|
new_max = reg->max;
|
||
|
|
assert(new_max > new_min);
|
||
|
|
|
||
|
|
/* Add the block. */
|
||
|
|
lmm_free(lmm, (void*)new_min, new_max - new_min);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|