mirror of https://github.com/dzavalishin/oskit/
69 lines
2.0 KiB
C
Executable File
69 lines
2.0 KiB
C
Executable File
/*
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* Copyright (c) 1995, 1998 University of Utah and the Flux Group.
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* All rights reserved.
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*
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* This file is part of the Flux OSKit. The OSKit is free software, also known
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* as "open source;" you can redistribute it and/or modify it under the terms
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* of the GNU General Public License (GPL), version 2, as published by the Free
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* Software Foundation (FSF). To explore alternate licensing terms, contact
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* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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*
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* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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* received a copy of the GPL along with the OSKit; see the file COPYING. If
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* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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*/
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#include "lmm.h"
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void lmm_find_free(lmm_t *lmm, oskit_addr_t *inout_addr,
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oskit_size_t *out_size, lmm_flags_t *out_flags)
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{
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struct lmm_region *reg;
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oskit_addr_t start_addr = (*inout_addr + ALIGN_MASK) & ~ALIGN_MASK;
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oskit_addr_t lowest_addr = (oskit_addr_t)-1;
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oskit_size_t lowest_size = 0;
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unsigned lowest_flags = 0;
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for (reg = lmm->regions; reg; reg = reg->next)
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{
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struct lmm_node *node;
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if ((reg->nodes == 0)
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|| (reg->max <= start_addr)
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|| (reg->min > lowest_addr))
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continue;
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for (node = reg->nodes; node; node = node->next)
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{
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assert((oskit_addr_t)node >= reg->min);
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assert((oskit_addr_t)node < reg->max);
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if ((oskit_addr_t)node >= lowest_addr)
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break;
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if ((oskit_addr_t)node + node->size > start_addr)
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{
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if ((oskit_addr_t)node > start_addr)
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{
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lowest_addr = (oskit_addr_t)node;
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lowest_size = node->size;
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}
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else
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{
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lowest_addr = start_addr;
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lowest_size = node->size
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- (lowest_addr - (oskit_addr_t)node);
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}
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lowest_flags = reg->flags;
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break;
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}
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}
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}
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*inout_addr = lowest_addr;
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*out_size = lowest_size;
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*out_flags = lowest_flags;
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}
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