Linux 4.8-rc8
[linux/fpc-iii.git] / arch / s390 / mm / mem_detect.c
blobd612cc3eec6a311e77cfa9a9659fe26308c6a7e6
1 /*
2 * Copyright IBM Corp. 2008, 2009
4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
5 */
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>
17 #define CHUNK_READ_WRITE 0
18 #define CHUNK_READ_ONLY 1
20 static inline void memblock_physmem_add(phys_addr_t start, phys_addr_t size)
22 memblock_add_range(&memblock.memory, start, size, 0, 0);
23 memblock_add_range(&memblock.physmem, start, size, 0, 0);
26 void __init detect_memory_memblock(void)
28 unsigned long memsize, rnmax, rzm, addr, size;
29 int type;
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);
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();