1#include <stdlib.h>
 2#include <stdint.h>
 3#include <limits.h>
 4#include <string.h>
 5#include <sys/mman.h>
 6#include <errno.h>
 7
 8#include "meta.h"
 9
10static void donate(unsigned char *base, size_t len)
11{
12	uintptr_t a = (uintptr_t)base;
13	uintptr_t b = a + len;
14	a += -a & (UNIT-1);
15	b -= b & (UNIT-1);
16	memset(base, 0, len);
17	for (int sc=47; sc>0 && b>a; sc-=4) {
18		if (b-a < (size_classes[sc]+1)*UNIT) continue;
19		struct meta *m = alloc_meta();
20		m->avail_mask = 0;
21		m->freed_mask = 1;
22		m->mem = (void *)a;
23		m->mem->meta = m;
24		m->last_idx = 0;
25		m->freeable = 0;
26		m->sizeclass = sc;
27		m->maplen = 0;
28		*((unsigned char *)m->mem+UNIT-4) = 0;
29		*((unsigned char *)m->mem+UNIT-3) = 255;
30		m->mem->storage[size_classes[sc]*UNIT-4] = 0;
31		queue(&ctx.active[sc], m);
32		a += (size_classes[sc]+1)*UNIT;
33	}
34}
35
36void __malloc_donate(char *start, char *end)
37{
38	donate((void *)start, end-start);
39}