void umm_extend(FAR void *mem, size_t size, int region)
{
mm_extend(USR_HEAP, mem, size, region);
}
FAR void *mm_sbrk(FAR struct mm_heap_s *heap, intptr_t incr,
uintptr_t maxbreak)
{
uintptr_t brkaddr;
uintptr_t allocbase;
unsigned int pgincr;
size_t bytesize;
int err;
DEBUGASSERT(incr >= 0);
if (incr < 0)
{
err = ENOSYS;
goto errout;
}
/* Get the current break address (NOTE: assumes region 0). If
* the memory manager is uninitialized, mm_brkaddr() will return
* zero.
*/
brkaddr = (uintptr_t)mm_brkaddr(heap, 0);
if (incr > 0)
{
/* Convert the increment to multiples of the page size */
pgincr = MM_NPAGES(incr);
/* Check if this increment would exceed the maximum break value */
if ((brkaddr > 0) && ((maxbreak - brkaddr) < (pgincr << MM_PGSHIFT)))
{
err = ENOMEM;
goto errout;
}
/* Allocate the requested number of pages and map them to the
* break address. If we provide a zero brkaddr to pgalloc(), it
* will create the first block in the correct virtual address
* space and return the start address of that block.
*/
allocbase = pgalloc(brkaddr, pgincr);
if (allocbase == 0)
{
err = EAGAIN;
goto errout;
}
/* Has the been been initialized? brkaddr will be zero if the
* memory manager has not yet been initialized.
*/
bytesize = pgincr << MM_PGSHIFT;
if (brkaddr != 0)
{
/* No... then initialize it now */
mm_initialize(heap, (FAR void *)allocbase, bytesize);
}
else
{
/* Extend the heap (region 0) */
mm_extend(heap, (FAR void *)allocbase, bytesize, 0);
}
}
return (FAR void *)brkaddr;
errout:
set_errno(err);
return (FAR void *)-1;
}
void kmm_extend(FAR void *mem, size_t size, int region)
{
mm_extend(&g_kmmheap, mem, size, region);
}
