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#include "types.h"
#include "consts.h"
#include "OS/OSAlloc.h"
static inline Cell* DLAddFront(Cell* list, Cell* cell)
{
cell->next = list;
cell->prev = NULL;
if (list != NULL)
list->prev = cell;
return cell;
}
static inline Cell* DLExtract(Cell* list, Cell* cell)
{
if (cell->next) {
cell->next->prev = cell->prev;
}
if (cell->prev == NULL) {
list = cell->next;
} else {
cell->prev->next = cell->next;
}
return list;
}
Cell *DLInsert(Cell *original, Cell *inserted)
{
Cell *prevCell = NULL;
Cell *nextCell = original;
for (nextCell = original, prevCell = NULL; nextCell; prevCell = nextCell, nextCell = nextCell->next)
{
if (inserted <= nextCell)
break;
}
inserted->next = nextCell;
inserted->prev = prevCell;
if (nextCell != NULL)
{
nextCell->prev = inserted;
Cell * temp = (Cell *)((char *)inserted + inserted->size);
if (temp == nextCell)
{
inserted->size += nextCell->size;
nextCell = nextCell->next;
inserted->next = nextCell;
if (nextCell != NULL)
nextCell->prev = inserted;
}
}
if (prevCell != NULL)
{
prevCell->next = inserted;
Cell * temp = (Cell *)((char *)prevCell + prevCell->size);
if (temp != inserted)
return original;
prevCell->size += inserted->size;
prevCell->next = nextCell;
if (nextCell != NULL)
nextCell->prev = prevCell;
return original;
}
return inserted;
}
extern HeapDesc *HeapArray;
#define HEADERSIZE OSi_ROUND(sizeof(Cell), 32)
#define MINOBJSIZE (HEADERSIZE+32)
void* OSAllocFromHeap(OSHeapHandle heap, u32 size)
{
HeapDesc* hd;
Cell* cell;
Cell* newCell;
long leftoverSize;
hd = &HeapArray[heap];
size += HEADERSIZE;
size = OSi_ROUND(size, 32);
for (cell = hd->free; cell != NULL; cell = cell->next) {
if ((long)size <= cell->size) {
break;
}
}
if (cell == NULL) {
return NULL;
}
leftoverSize = cell->size - (long)size;
if (leftoverSize < MINOBJSIZE) {
hd->free = DLExtract(hd->free, cell);
} else {
cell->size = (long)size;
newCell = (Cell *) ((char *)cell + size);
newCell->size = leftoverSize;
newCell->prev = cell->prev;
newCell->next = cell->next;
if (newCell->next != NULL) {
newCell->next->prev = newCell;
}
if (newCell->prev != NULL) {
newCell->prev->next = newCell;
} else {
hd->free = newCell;
}
}
hd->allocated = DLAddFront(hd->allocated, cell);
return (void *)((char *)cell + HEADERSIZE);
}
void OSFreeToHeap(OSHeapHandle heap, void* ptr)
{
HeapDesc *hd;
Cell *cell;
cell = (Cell *) ((char *)ptr - HEADERSIZE);
hd = &HeapArray[heap];
hd->allocated = DLExtract(hd->allocated, cell);
hd->free = DLInsert(hd->free, cell);
}
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