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
16static 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
31static int __init prom_meminit_v2(void)
32{
33	struct linux_prom_registers reg[64];
34	phandle node;
35	int size, num_ents, i;
36
37	node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
38	size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
39	num_ents = size / sizeof(struct linux_prom_registers);
40
41	for (i = 0; i < num_ents; i++) {
42		sp_banks[i].base_addr = reg[i].phys_addr;
43		sp_banks[i].num_bytes = reg[i].reg_size;
44	}
45
46	return num_ents;
47}
48
49static int sp_banks_cmp(const void *a, const void *b)
50{
51	const struct sparc_phys_banks *x = a, *y = b;
52
53	if (x->base_addr > y->base_addr)
54		return 1;
55	if (x->base_addr < y->base_addr)
56		return -1;
57	return 0;
58}
59
60/* Initialize the memory lists based upon the prom version. */
61void __init prom_meminit(void)
62{
63	int i, num_ents = 0;
64
65	switch (prom_vers) {
66	case PROM_V0:
67		num_ents = prom_meminit_v0();
68		break;
69
70	case PROM_V2:
71	case PROM_V3:
72		num_ents = prom_meminit_v2();
73		break;
74
75	default:
76		break;
77	}
78	sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
79	     sp_banks_cmp, NULL);
80
81	/* Sentinel.  */
82	sp_banks[num_ents].base_addr = 0xdeadbeef;
83	sp_banks[num_ents].num_bytes = 0;
84
85	for (i = 0; i < num_ents; i++)
86		sp_banks[i].num_bytes &= PAGE_MASK;
87}
88