projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 23d17421 | 1 | /* |
| 155af2f9 HJP |
2 | * Copyright IBM Corp. 2008, 2009 |
| 3 | * | |
| 4 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> | |
| 23d17421 HC |
5 | */ |
| 6 | ||
| 7 | #include <linux/kernel.h> | |
| 8 | #include <linux/module.h> | |
| 50be6345 PH |
9 | #include <linux/memblock.h> |
| 10 | #include <linux/init.h> | |
| 11 | #include <linux/debugfs.h> | |
| 12 | #include <linux/seq_file.h> | |
| 23d17421 HC |
13 | #include <asm/ipl.h> |
| 14 | #include <asm/sclp.h> | |
| 15 | #include <asm/setup.h> | |
| 16 | ||
| 23d17421 HC |
17 | #define ADDR2G (1ULL << 31) |
| 18 | ||
| 50be6345 PH |
19 | #define CHUNK_READ_WRITE 0 |
| 20 | #define CHUNK_READ_ONLY 1 | |
| 21 | ||
| 22 | static inline void memblock_physmem_add(phys_addr_t start, phys_addr_t size) | |
| 23 | { | |
| 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) | |
| 23d17421 HC |
29 | { |
| 30 | unsigned long long memsize, rnmax, rzm; | |
| 50be6345 PH |
31 | unsigned long addr, size; |
| 32 | int type; | |
| 23d17421 HC |
33 | |
| 34 | rzm = sclp_get_rzm(); | |
| 35 | rnmax = sclp_get_rnmax(); | |
| 36 | memsize = rzm * rnmax; | |
| 37 | if (!rzm) | |
| 38 | rzm = 1ULL << 17; | |
| 50be6345 | 39 | if (IS_ENABLED(CONFIG_32BIT)) { |
| 23d17421 | 40 | rzm = min(ADDR2G, rzm); |
| 50be6345 | 41 | memsize = min(ADDR2G, memsize); |
| 23d17421 | 42 | } |
| 50be6345 PH |
43 | max_physmem_end = memsize; |
| 44 | addr = 0; | |
| 45 | /* keep memblock lists close to the kernel */ | |
| 46 | memblock_set_bottom_up(true); | |
| 23d17421 HC |
47 | do { |
| 48 | size = 0; | |
| 49 | type = tprot(addr); | |
| 50 | do { | |
| 51 | size += rzm; | |
| 50be6345 | 52 | if (max_physmem_end && addr + size >= max_physmem_end) |
| 23d17421 HC |
53 | break; |
| 54 | } while (type == tprot(addr + size)); | |
| 55 | if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) { | |
| 50be6345 PH |
56 | if (max_physmem_end && (addr + size > max_physmem_end)) |
| 57 | size = max_physmem_end - addr; | |
| 58 | memblock_physmem_add(addr, size); | |
| 23d17421 HC |
59 | } |
| 60 | addr += size; | |
| 50be6345 PH |
61 | } while (addr < max_physmem_end); |
| 62 | memblock_set_bottom_up(false); | |
| 63 | if (!max_physmem_end) | |
| 64 | max_physmem_end = memblock_end_of_DRAM(); | |
| 60a0c68d | 65 | } |