Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ccc34028 | 2 | /* memory.c: Prom routine for acquiring various bits of information |
1da177e4 LT |
3 | * about RAM on the machine, both virtual and physical. |
4 | * | |
9f2b2a5f | 5 | * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
6 | * Copyright (C) 1997 Michael A. Griffith (grif@acm.org) |
7 | */ | |
8 | ||
1da177e4 | 9 | #include <linux/kernel.h> |
9f2b2a5f | 10 | #include <linux/sort.h> |
1da177e4 LT |
11 | #include <linux/init.h> |
12 | ||
13 | #include <asm/openprom.h> | |
1da177e4 | 14 | #include <asm/oplib.h> |
9f2b2a5f | 15 | #include <asm/page.h> |
1da177e4 | 16 | |
9f2b2a5f DM |
17 | static int __init prom_meminit_v0(void) |
18 | { | |
19 | struct linux_mlist_v0 *p; | |
20 | int index; | |
1da177e4 | 21 | |
9f2b2a5f DM |
22 | index = 0; |
23 | for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) { | |
24 | sp_banks[index].base_addr = (unsigned long) p->start_adr; | |
25 | sp_banks[index].num_bytes = p->num_bytes; | |
26 | index++; | |
27 | } | |
1da177e4 | 28 | |
9f2b2a5f DM |
29 | return index; |
30 | } | |
1da177e4 | 31 | |
9f2b2a5f | 32 | static int __init prom_meminit_v2(void) |
1da177e4 | 33 | { |
9f2b2a5f | 34 | struct linux_prom_registers reg[64]; |
8d125562 AS |
35 | phandle node; |
36 | int size, num_ents, i; | |
9f2b2a5f DM |
37 | |
38 | node = prom_searchsiblings(prom_getchild(prom_root_node), "memory"); | |
39 | size = prom_getproperty(node, "available", (char *) reg, sizeof(reg)); | |
40 | num_ents = size / sizeof(struct linux_prom_registers); | |
41 | ||
42 | for (i = 0; i < num_ents; i++) { | |
43 | sp_banks[i].base_addr = reg[i].phys_addr; | |
44 | sp_banks[i].num_bytes = reg[i].reg_size; | |
1da177e4 LT |
45 | } |
46 | ||
9f2b2a5f DM |
47 | return num_ents; |
48 | } | |
49 | ||
9f2b2a5f DM |
50 | static int sp_banks_cmp(const void *a, const void *b) |
51 | { | |
52 | const struct sparc_phys_banks *x = a, *y = b; | |
53 | ||
54 | if (x->base_addr > y->base_addr) | |
55 | return 1; | |
56 | if (x->base_addr < y->base_addr) | |
57 | return -1; | |
58 | return 0; | |
1da177e4 LT |
59 | } |
60 | ||
61 | /* Initialize the memory lists based upon the prom version. */ | |
62 | void __init prom_meminit(void) | |
63 | { | |
9f2b2a5f | 64 | int i, num_ents = 0; |
1da177e4 | 65 | |
9f2b2a5f | 66 | switch (prom_vers) { |
1da177e4 | 67 | case PROM_V0: |
9f2b2a5f | 68 | num_ents = prom_meminit_v0(); |
1da177e4 | 69 | break; |
9f2b2a5f | 70 | |
1da177e4 LT |
71 | case PROM_V2: |
72 | case PROM_V3: | |
9f2b2a5f | 73 | num_ents = prom_meminit_v2(); |
1da177e4 LT |
74 | break; |
75 | ||
1da177e4 LT |
76 | default: |
77 | break; | |
9f2b2a5f DM |
78 | } |
79 | sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks), | |
80 | sp_banks_cmp, NULL); | |
1da177e4 | 81 | |
9f2b2a5f DM |
82 | /* Sentinel. */ |
83 | sp_banks[num_ents].base_addr = 0xdeadbeef; | |
84 | sp_banks[num_ents].num_bytes = 0; | |
85 | ||
86 | for (i = 0; i < num_ents; i++) | |
87 | sp_banks[i].num_bytes &= PAGE_MASK; | |
1da177e4 | 88 | } |