mirror of
https://github.com/suchmememanyskill/TegraExplorer.git
synced 2024-11-08 21:21:50 +00:00
125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2018 naehrwert
|
|
* Copyright (c) 2018 M4xw
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include "heap.h"
|
|
#include "../../common/common_heap.h"
|
|
|
|
static void _heap_create(heap_t *heap, u32 start)
|
|
{
|
|
heap->start = start;
|
|
heap->first = NULL;
|
|
}
|
|
|
|
static u32 _heap_alloc(heap_t *heap, u32 size, u32 alignment)
|
|
{
|
|
hnode_t *node, *new;
|
|
int search = 1;
|
|
|
|
size = ALIGN(size, alignment);
|
|
|
|
if (!heap->first)
|
|
{
|
|
node = (hnode_t *)heap->start;
|
|
node->used = 1;
|
|
node->size = size;
|
|
node->prev = NULL;
|
|
node->next = NULL;
|
|
heap->first = node;
|
|
|
|
return (u32)node + sizeof(hnode_t);
|
|
}
|
|
|
|
node = heap->first;
|
|
while (search)
|
|
{
|
|
if (!node->used && size + sizeof(hnode_t) < node->size)
|
|
{
|
|
new = (hnode_t *)((u32)node + sizeof(hnode_t) + size);
|
|
|
|
new->size = node->size - sizeof(hnode_t) - size;
|
|
node->size = size;
|
|
node->used = 1;
|
|
new->used = 0;
|
|
new->next = node->next;
|
|
new->next->prev = new;
|
|
new->prev = node;
|
|
node->next = new;
|
|
|
|
return (u32)node + sizeof(hnode_t);
|
|
}
|
|
if (node->next)
|
|
node = node->next;
|
|
else
|
|
search = 0;
|
|
}
|
|
|
|
new = (hnode_t *)((u32)node + sizeof(hnode_t) + node->size);
|
|
new->used = 1;
|
|
new->size = size;
|
|
new->prev = node;
|
|
new->next = NULL;
|
|
node->next = new;
|
|
|
|
return (u32)new + sizeof(hnode_t);
|
|
}
|
|
|
|
static void _heap_free(heap_t *heap, u32 addr)
|
|
{
|
|
hnode_t *node = (hnode_t *)(addr - sizeof(hnode_t));
|
|
node->used = 0;
|
|
node = heap->first;
|
|
while (node)
|
|
{
|
|
if (!node->used)
|
|
{
|
|
if (node->prev && !node->prev->used)
|
|
{
|
|
node->prev->size += node->size + sizeof(hnode_t);
|
|
node->prev->next = node->next;
|
|
if (node->next)
|
|
node->next->prev = node->prev;
|
|
}
|
|
}
|
|
node = node->next;
|
|
}
|
|
}
|
|
|
|
heap_t _heap;
|
|
|
|
void heap_init(u32 base)
|
|
{
|
|
_heap_create(&_heap, base);
|
|
}
|
|
|
|
void *malloc(u32 size)
|
|
{
|
|
return (void *)_heap_alloc(&_heap, size, sizeof(hnode_t));
|
|
}
|
|
|
|
void *calloc(u32 num, u32 size)
|
|
{
|
|
void *res = (void *)_heap_alloc(&_heap, num * size, sizeof(hnode_t));
|
|
memset(res, 0, num * size);
|
|
return res;
|
|
}
|
|
|
|
void free(void *buf)
|
|
{
|
|
if ((u32)buf >= _heap.start)
|
|
_heap_free(&_heap, (u32)buf);
|
|
}
|