/*
* Allocate a 2^n chunk of pages, aligned at 2^n. This is currently
* for the benefit of thread stack allocation, and should be going
* away in some time when the migration to TLS is complete.
*/
static void *
alignedpgalloc(int shift)
{
struct stackcache *sc;
int align = 1<<shift;
size_t alignedoff;
void *rv;
if (shift == BMK_THREAD_STACK_PAGE_ORDER &&
(sc = LIST_FIRST(&cacheofstacks)) != NULL) {
LIST_REMOVE(sc, sc_entries);
return sc;
}
if (align > MAXPAGEALIGN)
align = MAXPAGEALIGN;
/* need to leave this much space until the next aligned alloc */
alignedoff = (bmk_membase + currentpg*PAGE_SIZE) % (align*PAGE_SIZE);
if (alignedoff)
currentpg += align - (alignedoff>>PAGE_SHIFT);
rv = bmk_allocpg(1<<shift);
if (((unsigned long)rv & (align*PAGE_SIZE-1)) != 0) {
bmk_printf("wanted %d aligned, got memory at %p\n",
align, rv);
bmk_platform_halt("fail");
}
return rv;
}
static void *
corealloc(int shift)
{
void *v;
#ifdef MEMALLOC_TESTING
v = malloc((1<<shift) * pagesz);
#else
v = bmk_allocpg(1<<shift);
#endif
return v;
}
