1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /* memory.c: Prom routine for acquiring various bits of information
3*4882a593Smuzhiyun * about RAM on the machine, both virtual and physical.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
6*4882a593Smuzhiyun * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/sort.h>
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <asm/openprom.h>
14*4882a593Smuzhiyun #include <asm/oplib.h>
15*4882a593Smuzhiyun #include <asm/page.h>
16*4882a593Smuzhiyun
prom_meminit_v0(void)17*4882a593Smuzhiyun static int __init prom_meminit_v0(void)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun struct linux_mlist_v0 *p;
20*4882a593Smuzhiyun int index;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun index = 0;
23*4882a593Smuzhiyun for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
24*4882a593Smuzhiyun sp_banks[index].base_addr = (unsigned long) p->start_adr;
25*4882a593Smuzhiyun sp_banks[index].num_bytes = p->num_bytes;
26*4882a593Smuzhiyun index++;
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun return index;
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun
prom_meminit_v2(void)32*4882a593Smuzhiyun static int __init prom_meminit_v2(void)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun struct linux_prom_registers reg[64];
35*4882a593Smuzhiyun phandle node;
36*4882a593Smuzhiyun int size, num_ents, i;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
39*4882a593Smuzhiyun size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
40*4882a593Smuzhiyun num_ents = size / sizeof(struct linux_prom_registers);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun for (i = 0; i < num_ents; i++) {
43*4882a593Smuzhiyun sp_banks[i].base_addr = reg[i].phys_addr;
44*4882a593Smuzhiyun sp_banks[i].num_bytes = reg[i].reg_size;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun return num_ents;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
sp_banks_cmp(const void * a,const void * b)50*4882a593Smuzhiyun static int sp_banks_cmp(const void *a, const void *b)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun const struct sparc_phys_banks *x = a, *y = b;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun if (x->base_addr > y->base_addr)
55*4882a593Smuzhiyun return 1;
56*4882a593Smuzhiyun if (x->base_addr < y->base_addr)
57*4882a593Smuzhiyun return -1;
58*4882a593Smuzhiyun return 0;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun /* Initialize the memory lists based upon the prom version. */
prom_meminit(void)62*4882a593Smuzhiyun void __init prom_meminit(void)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun int i, num_ents = 0;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun switch (prom_vers) {
67*4882a593Smuzhiyun case PROM_V0:
68*4882a593Smuzhiyun num_ents = prom_meminit_v0();
69*4882a593Smuzhiyun break;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun case PROM_V2:
72*4882a593Smuzhiyun case PROM_V3:
73*4882a593Smuzhiyun num_ents = prom_meminit_v2();
74*4882a593Smuzhiyun break;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun default:
77*4882a593Smuzhiyun break;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
80*4882a593Smuzhiyun sp_banks_cmp, NULL);
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun /* Sentinel. */
83*4882a593Smuzhiyun sp_banks[num_ents].base_addr = 0xdeadbeef;
84*4882a593Smuzhiyun sp_banks[num_ents].num_bytes = 0;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun for (i = 0; i < num_ents; i++)
87*4882a593Smuzhiyun sp_banks[i].num_bytes &= PAGE_MASK;
88*4882a593Smuzhiyun }
89