mirror of
https://git.rtems.org/rtems-libbsd/
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142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/**
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* @file
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*
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* @ingroup rtems_bsd_rtems
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*
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* @brief TODO.
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*/
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/*
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* Copyright (c) 2013 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/rtems-bsd-config.h>
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#include <machine/rtems-bsd-chunk.h>
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#include <sys/malloc.h>
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#include <rtems/score/apimutex.h>
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#define chunk_of_node(n) ((rtems_bsd_chunk_info *) n)
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static int
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chunk_compare(const rtems_rbtree_node *a, const rtems_rbtree_node *b)
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{
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const rtems_bsd_chunk_info *left = chunk_of_node(a);
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const rtems_bsd_chunk_info *right = chunk_of_node(b);
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if (left->begin < right->begin) {
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return -1;
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} else if (left->begin < right->end) {
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return 0;
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} else {
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return 1;
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}
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}
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void
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rtems_bsd_chunk_init(rtems_bsd_chunk_control *self, uintptr_t info_size,
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rtems_bsd_chunk_info_ctor info_ctor, rtems_bsd_chunk_info_dtor info_dtor)
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{
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self->info_size = info_size;
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self->info_ctor = info_ctor;
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self->info_dtor = info_dtor;
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rtems_rbtree_initialize_empty(&self->chunks, chunk_compare, true);
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}
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void *
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rtems_bsd_chunk_alloc(rtems_bsd_chunk_control *self, uintptr_t chunk_size)
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{
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char *p = malloc(chunk_size + self->info_size, M_TEMP, M_WAITOK);
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if (p != NULL) {
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rtems_bsd_chunk_info *info = (rtems_bsd_chunk_info *) p;
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p += self->info_size;
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info->begin = (uintptr_t) p;
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info->end = (uintptr_t) p + chunk_size;
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(*self->info_ctor)(self, info);
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_RTEMS_Lock_allocator();
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rtems_rbtree_insert_unprotected(&self->chunks, &info->node);
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_RTEMS_Unlock_allocator();
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}
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return p;
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}
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void
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rtems_bsd_chunk_free(rtems_bsd_chunk_control *self,
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void *some_addr_in_chunk)
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{
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rtems_bsd_chunk_info *info = rtems_bsd_chunk_get_info(self,
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some_addr_in_chunk);
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_RTEMS_Lock_allocator();
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rtems_rbtree_extract_unprotected(&self->chunks, &info->node);
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_RTEMS_Unlock_allocator();
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(*self->info_dtor)(self, info);
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free(info, M_TEMP);
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}
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rtems_bsd_chunk_info *
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rtems_bsd_chunk_get_info(rtems_bsd_chunk_control *self,
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void *some_addr_in_chunk)
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{
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rtems_bsd_chunk_info find_me = {
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.begin = (uintptr_t) some_addr_in_chunk
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};
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return chunk_of_node(rtems_rbtree_find_unprotected(&self->chunks,
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&find_me.node));
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}
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void *
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rtems_bsd_chunk_get_begin(rtems_bsd_chunk_control *self,
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void *some_addr_in_chunk)
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{
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rtems_bsd_chunk_info *info = rtems_bsd_chunk_get_info(self,
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some_addr_in_chunk);
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return (void *) info->begin;
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}
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void
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rtems_bsd_chunk_info_dtor_default(rtems_bsd_chunk_control *self,
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rtems_bsd_chunk_info *info)
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{
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(void) self;
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(void) info;
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}
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