| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright IBM Corp. 2008, 2009 |
| 4 | * |
| 5 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> |
| 6 | */ |
| 7 | |
| 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> |
| 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 | |
| 20 | static inline void memblock_physmem_add(phys_addr_t start, phys_addr_t size) |
| 21 | { |
| 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); |
| 26 | } |
| 27 | |
| 28 | void __init detect_memory_memblock(void) |
| 29 | { |
| 30 | unsigned long memsize, rnmax, rzm, addr, size; |
| 31 | int type; |
| 32 | |
| 33 | rzm = sclp.rzm; |
| 34 | rnmax = sclp.rnmax; |
| 35 | memsize = rzm * rnmax; |
| 36 | if (!rzm) |
| 37 | rzm = 1UL << 17; |
| 38 | max_physmem_end = memsize; |
| 39 | addr = 0; |
| 40 | /* keep memblock lists close to the kernel */ |
| 41 | memblock_set_bottom_up(true); |
| 42 | do { |
| 43 | size = 0; |
| 44 | /* assume lowcore is writable */ |
| 45 | type = addr ? tprot(addr) : CHUNK_READ_WRITE; |
| 46 | do { |
| 47 | size += rzm; |
| 48 | if (max_physmem_end && addr + size >= max_physmem_end) |
| 49 | break; |
| 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); |
| 55 | } |
| 56 | addr += size; |
| 57 | } while (addr < max_physmem_end); |
| 58 | memblock_set_bottom_up(false); |
| 59 | if (!max_physmem_end) |
| 60 | max_physmem_end = memblock_end_of_DRAM(); |
| 61 | memblock_dump_all(); |
| 62 | } |