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