1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright IBM Corp. 2008, 2009
5 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
8 #include <linux/kernel.h>
9 #include <linux/memblock.h>
10 #include <linux/init.h>
11 #include <linux/debugfs.h>
12 #include <linux/seq_file.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_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
23 start, start + size - 1);
24 memblock_add_range(&memblock.memory, start, size, 0, 0);
25 memblock_add_range(&memblock.physmem, start, size, 0, 0);
28 void __init detect_memory_memblock(void)
30 unsigned long memsize, rnmax, rzm, addr, size;
35 memsize = rzm * rnmax;
38 max_physmem_end = memsize;
40 /* keep memblock lists close to the kernel */
41 memblock_set_bottom_up(true);
44 /* assume lowcore is writable */
45 type = addr ? tprot(addr) : CHUNK_READ_WRITE;
48 if (max_physmem_end && addr + size >= max_physmem_end)
50 } while (type == tprot(addr + size));
51 if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
52 if (max_physmem_end && (addr + size > max_physmem_end))
53 size = max_physmem_end - addr;
54 memblock_physmem_add(addr, size);
57 } while (addr < max_physmem_end);
58 memblock_set_bottom_up(false);
60 max_physmem_end = memblock_end_of_DRAM();