1/*
 2 * Copyright IBM Corp. 2008, 2009
 3 *
 4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
 5 */
 6
 7#include <linux/kernel.h>
 8#include <linux/module.h>
 9#include <linux/memblock.h>
10#include <linux/init.h>
11#include <linux/debugfs.h>
12#include <linux/seq_file.h>
13#include <asm/ipl.h>
14#include <asm/sclp.h>
15#include <asm/setup.h>
16
17#define CHUNK_READ_WRITE 0
18#define CHUNK_READ_ONLY  1
19
20static inline void memblock_physmem_add(phys_addr_t start, phys_addr_t size)
21{
22	memblock_add_range(&memblock.memory, start, size, 0, 0);
23	memblock_add_range(&memblock.physmem, start, size, 0, 0);
24}
25
26void __init detect_memory_memblock(void)
27{
28	unsigned long memsize, rnmax, rzm, addr, size;
29	int type;
30
31	rzm = sclp.rzm;
32	rnmax = sclp.rnmax;
33	memsize = rzm * rnmax;
34	if (!rzm)
35		rzm = 1UL << 17;
36	max_physmem_end = memsize;
37	addr = 0;
38	/* keep memblock lists close to the kernel */
39	memblock_set_bottom_up(true);
40	do {
41		size = 0;
42		type = tprot(addr);
43		do {
44			size += rzm;
45			if (max_physmem_end && addr + size >= max_physmem_end)
46				break;
47		} while (type == tprot(addr + size));
48		if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
49			if (max_physmem_end && (addr + size > max_physmem_end))
50				size = max_physmem_end - addr;
51			memblock_physmem_add(addr, size);
52		}
53		addr += size;
54	} while (addr < max_physmem_end);
55	memblock_set_bottom_up(false);
56	if (!max_physmem_end)
57		max_physmem_end = memblock_end_of_DRAM();
58}