/*
* Free memory block
*/
LOCAL ER rel_blk( MPLCB *mplcb, void *blk )
{
QUEUE *aq;
aq = (QUEUE*)blk - 1;
#if CHK_PAR
if ( !chkAreaFlag(aq, AREA_USE) ) {
return E_PAR;
}
#endif
clrAreaFlag(aq, AREA_USE);
if ( !chkAreaFlag(aq->next, AREA_USE) ) {
/* Merge to the next area */
removeFreeQue(aq->next + 1);
removeAreaQue(aq->next);
}
if ( !chkAreaFlag(aq->prev, AREA_USE) ) {
/* Merge to the previous area */
aq = aq->prev;
removeFreeQue(aq + 1);
removeAreaQue(aq->next);
}
/* Register free area onto FreeQue */
appendFreeArea(mplcb, aq);
return E_OK;
}
/*
* Free memory
* It may be called during interrupt disable. In this case, need to wait
* until interrupt is enabled and until free.
*/
LOCAL void ifree( void *ptr, IMACB *imacb )
{
QUEUE *aq;
UW imask;
DI(imask); /* Exclusive control by interrupt disable */
SpinLock(&MemLockObj);
aq = (QUEUE*)ptr - 1;
clrAreaFlag(aq, AREA_USE);
if ( !chkAreaFlag(aq->next, AREA_END|AREA_USE) ) {
/* Merge with free area in after location */
removeFreeQue(aq->next + 1);
removeAreaQue(aq->next);
}
if ( !chkAreaFlag(aq, AREA_TOP) && !chkAreaFlag(aq->prev, AREA_USE) ) {
/* Merge with free area in front location */
aq = aq->prev;
removeFreeQue(aq + 1);
removeAreaQue(aq->next);
}
/* If the whole page is free, then free the page.
* However, do not free the page if it is called during
* interrupt disabled.
*/
if ( !isDI(imask) && chkAreaFlag(aq, AREA_TOP) && chkAreaFlag(aq->next, AREA_END) ) {
/* Free pages */
removeAreaQue(aq->next);
removeAreaQue(aq);
SpinUnlock(&MemLockObj);
EI(imask);
RelSysMemBlk(aq);
DI(imask);
SpinLock(&MemLockObj);
} else {
/* Register free area to FreeQue */
appendFreeArea(aq, imacb);
}
SpinUnlock(&MemLockObj);
EI(imask);
}
/*
* Free memory
*/
static void _mem_free( void *ptr, MACB *macb )
{
LIST *aq;
if ( ptr == 0 ) {
return;
}
if ( macb->testmode > 0 ) {
if ( !chkalloc(ptr, 0, macb) ) {
return;
}
}
aq = (LIST *)ptr - 1;
clrAreaFlag(aq, AREA_USE);
if ( !chkAreaFlag(aq->next, AREA_END|AREA_USE) ) {
/* Merge with just next free area */
removeFreeQue(aq->next + 1);
removeAreaQue(aq->next);
}
if ( !chkAreaFlag(aq, AREA_TOP) && !chkAreaFlag(aq->previous, AREA_USE) ) {
/* Merge with just previous free area */
aq = aq->previous;
removeFreeQue(aq + 1);
removeAreaQue(aq->next);
}
/* If whole page is empty, then release the page itself */
if ( chkAreaFlag(aq, AREA_TOP) && chkAreaFlag(aq->next, AREA_END) ) {
/* Page release */
removeAreaQue(aq->next);
removeAreaQue(aq);
(*macb->relblk)(aq);
} else {
/* Register free area in free queue */
appendFreeArea(aq, macb);
}
}
/*
* Memory allocation size change
*/
static void *_mem_realloc( void *ptr, RAW_U32 size, MACB *macb )
{
LIST *aq;
RAW_U32 oldsz, sz;
if ( macb->testmode > 0 ) {
if ( !chkalloc(ptr, 0, macb) ) {
return 0;
}
}
/* If smaller than minimum fragment size,
allocate minimum fragment size */
if ( size > 0 && size < MIN_FRAGMENT ) {
size = MIN_FRAGMENT;
}
size = ROUND(size);
aq = (LIST *)ptr - 1;
if ( ptr != 0 ) {
/* Current allocation size */
oldsz = (RAW_U32)AreaSize(aq);
/* Merge if next space is free space */
if ( !chkAreaFlag(aq->next, AREA_END|AREA_USE) ) {
removeFreeQue(aq->next + 1);
removeAreaQue(aq->next);
}
sz = (RAW_U32)AreaSize(aq);
} else {
sz = oldsz = 0;
}
if ( size <= sz ) {
if ( size > 0 ) {
/* Fragment current area and allocate */
allocate(aq, size, macb);
} else {
/* Release area */
_mem_free(ptr, macb);
ptr = 0;
}
} else {
/* Allocate new area */
void *newptr = _mem_malloc(size, macb);
if ( newptr == 0 ) {
/* Reallocate original area at original size */
if ( ptr != 0 ) {
allocate(aq, oldsz, macb);
}
return 0;
}
if ( ptr != 0 ) {
/* Copy contents */
raw_memcpy(newptr, ptr, oldsz);
/* Release old area */
_mem_free(ptr, macb);
}
ptr = newptr;
}
return ptr;
}
